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Today, more than ever, the problem of juvenile delinquency pricks at the conscience of many societies, and India is not an exception. In this study, the researcher discusses the experiences and views of teachers of secondary schools regarding juvenile delinquency and the apparent moral decline among their learners. The problem was investigated from the perspective of socio-education, a field of research which, amongst others, studies the role of social factors that feature in the development of children and youth during their growth to adulthood. In Indian schools, the problem of juvenile delinquency is a issue. In his article on discipline in the Free State township schools, Masitsa (2008: 234- 236), cites a number of newspaper reports of juvenile delinquency among school children. This problem is not unique to South Africa, but affects many industrialised countries today (Rossouw, 2003: 416). De Wet’s study (2004: 206) on school vandalism, which is an example of antisocial behaviour, reveals that the problem also affects Britain, USA, Canada, France, the Netherlands and Australia, amongst others. MATERIALS AND METHODS: The research design for this study was a combination of quantitative and mainly qualitative, descriptive and interpretive enquiry, thus a mixed method research (MMR) approach. The study conducted on 91 samples. Data was collected using questionnaire and focus group interview. RESULTS: The delinquency rates in selected schools are very high. In addition, it was found that male learners, more than female learners, exhibit the most antisocial behaviour. In general, both genders, at varying rates disrespect authority, have the habit of lying, engage in theft, vandalism, truancy, substance and alcohol abuse, inappropriate sexual behaviour resulting in teenage pregnancy, and gangsterism, amongst others. The variable of location indicates that schools in formerly disadvantaged areas such as townships, squatter and rural areas experience the most antisocial behaviours by learners, as compared to their counterparts in formerly advantaged areas. Most teachers’ personal encounters of the problem in city schools seemed to be minimal. Some teachers of schools that are situated in middle class areas in townships shared similar sentiments to those of their city counterparts. Although the rate of learner misconduct is alarming, it can be contained as evidenced by behavioural changes witnessed in those learners who are remorseful. This suggests that intervention strategies do play a positive role in curbing unacceptable behaviour. Conclusion: The findings of this study suggested that the majority of teachers in secondary schools are aware of the huge challenge posed by delinquent learners with regard to teaching and learning. The major perceptions the study gathered were that the dawn of a democratic dispensation in 1994 worsened adolescent delinquency and rendered many previously disadvantaged schools dysfunctional

COG-UK is supported by funding from the MRC part of UK Research & Innovation, the National Institute of Health Research (Grant code MC_PC_19027), and Genome Research Limited, operating as the Welcome Sanger Institute. Background The first epidemic wave of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) in Scotland resulted in high case numbers and mortality in care homes. In Lothian, over one-third of care homes reported an outbreak, while there was limited testing of hospital patients discharged to care homes. Aim To investigate patients discharged from hospitals as a source of SARS-CoV-2 introduction into care homes during the first epidemic wave. Methods A clinical review was performed for all patients discharges from hospitals to care homes from 1st March 2020 to 31st May 2020. Episodes were ruled out based on coronavirus disease 2019 (COVID-19) test history, clinical assessment at discharge, whole-genome sequencing (WGS) data and an infectious period of 14 days. Clinical samples were processed for WGS, and consensus genomes generated were used for analysis using Cluster Investigation and Virus Epidemiological Tool software. Patient timelines were obtained using electronic hospital records. Findings In total, 787 patients discharged from hospitals to care homes were identified. Of these, 776 (99%) were ruled out for subsequent introduction of SARS-CoV-2 into care homes. However, for 10 episodes, the results were inconclusive as there was low genomic diversity in consensus genomes or no sequencing data were available. Only one discharge episode had a genomic, time and location link to positive cases during hospital admission, leading to 10 positive cases in their care home. Conclusion The majority of patients discharged from hospitals were ruled out for introduction of SARS-CoV-2 into care homes, highlighting the importance of screening all new admissions when faced with a novel emerging virus and no available vaccine. Publisher PDF

Cancer vaccines are promising adjuvant immunotherapies that can stimulate the immune system to recognize tumor-associated antigens and eliminate the residual or recurring disease. The aberrant and restricted expression of highly immunogenic cancer testis antigen NY-ESO-1 in several malignancies, including triple-negative breast cancer, melanoma, myelomas, and ovarian cancer, makes NY-ESO-1 an attractive antigenic target for cancer vaccines. This study describes a NY-ESO-1 vaccine based on a bio-inspired nanomaterial platform technology, specifically a plant virus nanoparticle. The 30 nm icosahedral plant virus cowpea mosaic virus (CPMV) displaying multiple copies of human HLA-A2 restricted peptide antigen NY-ESO-1(157–165) exhibited enhanced uptake and activation of antigen-presenting cells and stimulated a potent CD8(+) T cell response in transgenic human HLA-A2 expressing mice. CD8(+) T cells from immunized mice exhibited antigen-specific proliferation and cancer cell cytotoxicity, highlighting the potential application of a CPMV-NY-ESO-1 vaccine against NY-ESO-1(+) malignancies.

The Medical Information Department of a pharmaceutical manufacturer provides written scientific responses to unsolicited requests from healthcare providers for information on products that extends beyond the product labeling (off-label). These scientific response documents are non-promotional, evidence-based, and scientifically balanced, conforming with internal pharmaceutical manufacturer's procedures and the Food and Drug Administration (FDA) Draft Guidance on Responding to Unsolicited Requests for Off-Label Information. Members of phactMI™ developed this proposal to offer best practices for content generation of scientific response documents. Scientific response documents review available literature to respond to an unsolicited request; therefore, they are similar in nature to systematic reviews. The sections and elements identified in this proposed best practice guidelines for scientific response documents are based on an adaptation of the sections and elements of systematic reviews. The sections of a scientific response document should include a restatement of the unsolicited request (title); a structured summary (abstract); approved indications, black box warnings, and background information when appropriate (introduction); the literature search information and study selection (methods); summation of data from clinical trials, meta-analysis, case reports, and/or real world evidence, as appropriate (results); treatment guidelines, if applicable and available (discussion); and references. Elements for each section should be included in a scientific response document as appropriate, as some elements are not necessary in some documents, based on the question. These elements were selected for inclusion to address any potential concerns of bias and transparency and reflect the intent that scientific response documents should be non-promotional, accurate, truthful, free of commercial bias, scientifically balanced, and evidence based.

Summary Background Lateral flow devices (LFDs) for rapid antigen testing are set to become a cornerstone of SARS-CoV-2 mass community testing, although their reduced sensitivity compared with PCR has raised questions of how well they identify infectious cases. Understanding their capabilities and limitations is, therefore, essential for successful implementation. We evaluated six commercial LFDs and assessed their correlation with infectious virus culture and PCR cycle threshold (Ct) values. Methods In a single-centre, laboratory evaluation study, we did a head-to-head comparison of six LFDs commercially available in the UK: Innova Rapid SARS-CoV-2 Antigen Test, Spring Healthcare SARS-CoV-2 Antigen Rapid Test Cassette, E25Bio Rapid Diagnostic Test, Encode SARS-CoV-2 Antigen Rapid Test Device, SureScreen COVID-19 Rapid Antigen Test Cassette, and SureScreen COVID-19 Rapid Fluorescence Antigen Test. We estimated the specificities and sensitivities of the LFDs using stored naso-oropharyngeal swabs collected at St Thomas' Hospital (London, UK) for routine diagnostic SARS-CoV-2 testing by real-time RT-PCR (RT-rtPCR). Swabs were from inpatients and outpatients from all departments of St Thomas' Hospital, and from health-care staff (all departments) and their household contacts. SARS-CoV-2-negative swabs from the same population (confirmed by RT-rtPCR) were used for comparative specificity determinations. All samples were collected between March 23 and Oct 27, 2020. We determined the limit of detection (LOD) for each test using viral plaque-forming units (PFUs) and viral RNA copy numbers of laboratory-grown SARS-CoV-2. Additionally, LFDs were selected to assess the correlation of antigen test result with RT-rtPCR Ct values and positive viral culture in Vero E6 cells. This analysis included longitudinal swabs from five infected inpatients with varying disease severities. Furthermore, the sensitivities of available LFDs were assessed in swabs (n=23; collected from Dec 4, 2020, to Jan 12, 2021) confirmed to be positive (RT-rtPCR and whole-genome sequencing) for the B.1.1.7 variant, which was the dominant genotype in the UK at the time of study completion. Findings All LFDs showed high specificity (≥98·0%), except for the E25Bio test (86·0% [95% CI 77·9–99·9]), and most tests reliably detected 50 PFU/test (equivalent SARS-CoV-2 N gene Ct value of 23·7, or RNA copy number of 3 × 106/mL). Sensitivities of the LFDs on clinical samples ranged from 65·0% (55·2–73·6) to 89·0% (81·4–93·8). These sensitivities increased to greater than 90% for samples with Ct values of lower than 25 for all tests except the SureScreen fluorescence (SureScreen-F) test. Positive virus culture was identified in 57 (40·4%) of 141 samples; 54 (94·7%) of the positive cultures were from swabs with Ct values lower than 25. Among the three LFDs selected for detailed comparisons (the tests with highest sensitivity [Innova], highest specificity [Encode], and alternative technology [SureScreen-F]), sensitivity of the LFDs increased to at least 94·7% when only including samples with detected viral growth. Longitudinal studies of RT-rtPCR-positive samples (tested with Innova, Encode, and both SureScreen-F and the SureScreen visual [SureScreen-V] test) showed that most of the tests identified all infectious samples as positive. Test performance (assessed for Innova and SureScreen-V) was not affected when reassessed on swabs positive for the UK variant B.1.1.7. Interpretation In this comprehensive comparison of antigen LFDs and virus infectivity, we found a clear relationship between Ct values, quantitative culture of infectious virus, and antigen LFD positivity in clinical samples. Our data support regular testing of target groups with LFDs to supplement the current PCR testing capacity, which would help to rapidly identify infected individuals in situations in which they would otherwise go undetected. Funding King's Together Rapid COVID-19, Medical Research Council, Wellcome Trust, Huo Family Foundation, UK Department of Health, National Institute for Health Research Comprehensive Biomedical Research Centre.

INTRODUCTION: Tumors employ many strategies to attenuate immune responses. High levels of extracellular adenosine generated in the tumor microenvironment engage A2a and A2b adenosine receptors on immune cells, resulting in immunosuppression. Expression of A2aR and A2bR can vary by cell type, with T cells predominantly expressing A2aR while myeloid cells express both A2aR and A2bR. We have previously shown that etrumadenant, a dual A2aR/A2bR antagonist, blocks the immunosuppressive effects of adenosine in immune cells and enhances anti-tumor immune responses in mouse syngeneic tumors. Using dual and selective adenosine receptor antagonists, we assessed the contribution of these receptors to adenosine-mediated phenotypes in immune and cancer cells. METHODS: Human CD8+ T cells were isolated from healthy human blood and activated using CD3/CD28/CD2 stimulation and cytokines were analyzed by cytokine bead array at 72 hours. Primary human dendritic cells (DC) were isolated from healthy blood and matured with LPS/IFN-γ for 24 hours. Cancer cell lines were purchased from ATCC. The adenosine analogue NECA was used to stimulate A2aR/A2bR-mediated signaling. RESULTS: Activated human CD8+ T cells stimulated in the presence of NECA showed suppression of activation markers (CD69) and cytokine production (IFN-γ, IL-2 and granzyme B). As expected, we observed similar rescue of this phenotype with both etrumadenant and an A2aR-specific antagonist owing to the sole expression of A2aR on T cells. In contrast, primary DC have comparable expression of A2aR and A2bR, suggesting that dual blockade may provide greater resistance to adenosine-mediated suppression than A2aR antagonism. Indeed, etrumadenant was able to attenuate the adenosine-mediated upregulation of IL-10 and enhance IL-12p70 production, whereas a comparable A2aR-specific antagonist showed no significant rescue versus NECA-stimulated controls. These observations may be extended to suppressive myeloid populations as well as tumor-resident macrophages and myeloid-derived suppressor cells isolated from mouse syngeneic tumors, which have very high expression of both A2aR and A2bR. RNA-sequencing identified a cassette of genes regulated by adenosine-signaling in these cells, which were largely reversed by etrumadenant. Finally, cultured human cancer cell lines have high expression of A2bR, which has been implicated in driving their tumorigenesis. Etrumadenant reversed adenosine-stimulated gene expression changes in non-small cell lung cancer cell lines, restoring enriched pathways driven by adenosine signaling. CONCLUSIONS: Taken together, these results show an important role for A2aR/A2bR in adenosine-mediated immunosuppression and provide a mechanistic rationale for stimulation of anti-tumor immune responses with the dual adenosine receptor antagonist etrumadenant. Citation Format: Sachie Marubayashi, Bindi Patel, Livia Yamashiro, Dana Piovesan, Sean Cho, Jenna Jeffrey, Manmohan Leleti, Jay Powers, Matt Walters, Daniel DiRenzo. Dual A2aR/A2bR antagonism with etrumadenant (AB928) eliminates the suppressive effects of adenosine on immune and cancer cells in the tumor microenvironment [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 256.

Disrupted homeostasis of the microtubule binding protein tau is a shared feature of a set of neurodegenerative disorders known as tauopathies. Acetylation of soluble tau is an early pathological event in neurodegeneration. In this work, we find that a large fraction of neuronal tau is degraded by chaperone-mediated autophagy (CMA) whereas, upon acetylation, tau is preferentially degraded by macroautophagy and endosomal microautophagy. Rerouting of acetylated tau to these other autophagic pathways originates, in part, from the inhibitory effect that acetylated tau exerts on CMA and results in its extracellular release. In fact, experimental blockage of CMA enhances cell-to-cell propagation of pathogenic tau in a mouse model of tauopathy. Furthermore, analysis of lysosomes isolated from brains of patients with tauopathies demonstrates similar molecular mechanisms leading to CMA dysfunction. This study reveals that CMA failure in tauopathy brains alters tau homeostasis and could contribute to aggravate disease progression., The tau protein has been implicated in neurodegenerative disorders and can propagate from cell to cell. Here, the authors show that tau acetylation reduces its degradation by chaperone-mediated autophagy, causing re-routing to other autophagic pathways and increasing extracellular tau release.

18 p.-8 fig., Chaperone-mediated autophagy activity, essential in the cellular defense against proteotoxicity, declines with age, and preventing this decline in experimental genetic models has proven beneficial. Here, we have identified the mechanism of action of selective chaperone-mediated autophagy activators previously developed by our group and have leveraged that information to generate orally bioavailable chaperone-mediated autophagy activators with favorable brain exposure. Chaperone-mediated autophagy activating molecules stabilize the interaction between retinoic acid receptor alpha - a known endogenous inhibitor of chaperone-mediated autophagy - and its co-repressor, nuclear receptor corepressor 1, resulting in changes of a discrete subset of the retinoic acid receptor alpha transcriptional program that leads to selective chaperone-mediated autophagy activation. Chaperone-mediated autophagy activators molecules activate this pathway in vivo and ameliorate retinal degeneration in a retinitis pigmentosa mouse model. Our findings reveal a mechanism for pharmacological targeting of chaperone-mediated autophagy activation and suggest a therapeutic strategy for retinal degeneration., This work was supported by National Institutes of Health grants AG054108, AG021904, and AG017617 (to AMC) and AG038072 (to AMC, FM, and EG), the JPB Foundation (to AMC), the Michael J. Fox Foundation (to AMC and EG), the Rainwater Charitable Foundation (to AMC and EG) and the Backus Foundation (to AMC). Chemical synthesis, NMR and MS data were in part supported by NIH awards P30 CA013330 and 1S10OD016305. Research in PB and RGS lab is funded by Ministerio de Ciencia, Innovación y Universidades (MCIU), Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER) PGC2018-098557-B-I00 to PB and RTI2018-098990-J-I00 to RGS. CAR was supported by T32 GM007491 and MM by T32 AG023475.

Obesity is associated with changes in the immune system that significantly hinder its ability to mount efficient immune responses. Previous studies have reported a dysregulation of immune responses caused by lipid challenge; however, the mechanisms underlying that dysregulation are still not completely understood. Autophagy is an essential catabolic process through which cellular components are degraded by the lysosomal machinery. In T cells, autophagy is an actively regulated process necessary to sustain homeostasis and activation. Here, we report that CD4(+) T cell responses are inhibited when cells are challenged with increasing concentrations of fatty acids. Furthermore, analysis of T cells from diet-induced obese mice confirms that high lipid load inhibits activation-induced responses in T cells. We have found that autophagy is inhibited in CD4(+) T cells exposed in vitro or in vivo to lipid stress, which causes decreased autophagosome formation and degradation. Supporting that inhibition of autophagy caused by high lipid load is a key mechanism that accounts for the effects on T cell function of lipid stress, we found that ATG7 (autophagy-related 7)-deficient T cells, unable to activate autophagy, did not show additional inhibitory effects on their responses to activation when subjected to lipid challenge. Our results indicate, thus, that increased lipid load can dysregulate autophagy and cause defective T cell responses, and suggest that inhibition of autophagy may underlie some of the characteristic obesity-associated defects in the T cell compartment. Abbreviations: ACTB: actin, beta; ATG: autophagy-related; CDKN1B: cyclin-dependent kinase inhibitor 1B; HFD: high-fat diet; IFNG: interferon gamma; IL: interleukin; MAPK1/ERK2: mitogen-activated protein kinase 1; MAPK3/ERK1: mitogen-activated protein kinase 3; MAPK8/JNK: mitogen-activated protein kinase 8; LC3-I: non-conjugated form of MAP1LC3B; LC3-II: phosphatidylethanolamine-conjugated form of MAP1LC3B; MAP1LC3B: microtubule-associated protein 1 light chain 3 beta; MS: mass spectrometry; MTOR: mechanistic target of rapamycin kinase; NFATC2: nuclear factor of activated T cells, cytoplasmic, calcineurin dependent 2; NLRP3: NLR family, pyrin domain containing 3; OA: oleic acid; PI: propidium iodide; ROS: reactive oxygen species; STAT5A: signal transducer and activator of transcription 5A; TCR: T cell receptor; T(H)1: T helper cell type 1

Autophagy delivers cytosolic components to lysosomes for degradation and is thus essential for cellular homeostasis and to cope with different stressors. As such, autophagy counteracts various human diseases and its reduction leads to aging-like phenotypes. Macroautophagy (MA) can selectively degrade organelles or aggregated proteins, whereas selective degradation of single proteins has only been described for chaperone-mediated autophagy (CMA) and endosomal microautophagy (eMI). These 2 autophagic pathways are specific for proteins containing KFERQ-related targeting motifs. Using a KFERQ-tagged fluorescent biosensor, we have identified an eMI-like pathway in Drosophila melanogaster. We show that this biosensor localizes to late endosomes and lysosomes upon prolonged starvation in a KFERQ- and Hsc70-4- dependent manner. Furthermore, fly eMI requires endosomal multivesicular body formation mediated by ESCRT complex components. Importantly, induction of Drosophila eMI requires longer starvation than the induction of MA and is independent of the critical MA genes atg5, atg7, and atg12. Furthermore, inhibition of Tor signaling induces eMI in flies under nutrient rich conditions, and, as eMI in Drosophila also requires atg1 and atg13, our data suggest that these genes may have a novel, additional role in regulating eMI in flies. Overall, our data provide the first evidence for a novel, starvation-inducible, catabolic process resembling endosomal microautophagy in the Drosophila fat body.

149 Background: With the emergence of potent therapies in non-metastatic castration-resistant prostate cancer (nmCRPC) there is a need to understand the impact of nmCRPC treatments on patient comorbidities and concomitant medications. The goal of this study was to understand treatment management of nmCRPC in patients with pre-existing comorbidities from a physician perspective. Methods: Physicians who treated nmCRPC patients with systemic therapy were recruited from a US physician panel for an online survey (Sept-Oct 2019). Physician responses included physician treatment practice, demographic characteristics, and their 'typical' nmCRPC patient profile from the past 6 months (e.g., health profile, disease management, and quality of life [QOL]). Results: Fifty US physicians (56% urologists, 44% oncologists) with 21±6 years in practice, treated on average 30 nmCRPC patients in the past 6 months. The most common nmCRPC treatments were leuprolide acetate (82%), enzalutamide (80%) and apalutamide (70%). The most common comorbidities reported were hypertension (96%), sexual dysfunction (94%), diabetes (92%), myocardial infarction (88%) and urinary issues (88%). 78% of the physicians reported taking comorbidities and medications for comorbidities into consideration when prescribing nmCRPC treatments. Between 15%-28% of physicians reported a change in nmCRPC prostate treatment and 19%-26% reported a dose change in nmCRPC treatment for up to 1/3 of their patients due to comorbidities (Table). For QOL, urologists versus oncologists indicated more days with poor health status among nmCRPC patients (e.g., median poor mental health days 30-days prior to treatment: urologists=15 days vs oncologists=5 days). Conclusions: Many physicians take into account pre-existing comorbidities and their medications when prescribing nmCRPC treatments. Differences in perceived QOL were observed between physician specialty. These findings highlight the importance of considering therapies that lessen the treatment burden in nmCRPC. [Table: see text]

Summary Inability to preserve proteostasis with age contributes to the gradual loss of function that characterizes old organisms. Defective autophagy, a component of the proteostasis network for delivery and degradation of intracellular materials in lysosomes, has been described in multiple old organisms, while a robust autophagy response has been linked to longevity. The molecular mechanisms responsible for defective autophagic function with age remain, for the most part, poorly characterized. In this work, we have identified differences between young and old cells in the intracellular trafficking of the vesicular compartments that participate in autophagy. Failure to reposition autophagosomes and lysosomes toward the perinuclear region with age reduces the efficiency of their fusion and the subsequent degradation of the sequestered cargo. Hepatocytes from old mice display lower association of two microtubule‐based minus‐end‐directed motor proteins, the well‐characterized dynein, and the less‐studied KIFC3, with autophagosomes and lysosomes, respectively. Using genetic approaches to mimic the lower levels of KIFC3 observed in old cells, we confirmed that reduced content of this motor protein in fibroblasts leads to failed lysosomal repositioning and diminished autophagic flux. Our study connects defects in intracellular trafficking with insufficient autophagy in old organisms and identifies motor proteins as a novel target for future interventions aiming at correcting autophagic activity with anti‐aging purposes.

Macroautophagy is a cellular process that mediates degradation in the lysosome of cytoplasmic components including proteins and organelles. Previous studies have shown that macroautophagy is induced in activated T cells to regulate organelle homeostasis and the cell's energy metabolism. However, the signaling pathways that initiate and regulate activation-induced macroautophagy in T cells have not been identified. Here, we show that activation-induced macroautophagy in T cells depends on signaling from common γ-chain cytokines. Consequently, inhibition of signaling through JAK3, induced downstream of cytokine receptors containing the common γ-chain, prevents full induction of macroautophagy in activated T cells. Moreover, we found that common γ-chain cytokines are not only required for macroautophagy upregulation during T cell activation but can themselves induce macroautophagy. Our data also show that macroautophagy induction in T cells is associated with an increase of LC3 expression that is mediated by a post-transcriptional mechanism. Overall, our findings unveiled a new role for common γ-chain cytokines as a molecular link between autophagy induction and T-cell activation.

Chaperone-mediated autophagy (CMA), a selective form of degradation of cytosolic proteins in lysosomes, contributes to maintenance of proteostasis and to the cellular adaptation to stress. CMA substrates are delivered by a cytosolic chaperone to the lysosomal surface, where, upon unfolding, they are internalized through a membrane translocation complex. The molecular components that participate in CMA substrate targeting and translocation are well characterized, but those involved in CMA regulation remain mostly unknown. In this study, we have identified that CMA is under the positive control of the phosphatase PHLPP1 that associates with the lysosomal membrane and counteracts the inhibitory effect of mTORC2 on CMA. Lysosomal Akt, a target of the mTORC2/PHLPP1 kinase-phosphatase pair, modulates CMA activity by controlling the dynamics of assembly and disassembly of the CMA translocation complex at the lysosomal membrane. The lysosomal mTORC2/PHLPP1/Akt axis could become a target to restore CMA dysfunction in aging and disease.

Chaperone-mediated autophagy (CMA) is a multistep process that involves selective degradation and digestion of a pool of soluble cytosolic proteins in lysosomes. Cytosolic substrates are selectively identified and targeted by chaperones to lysosomes where they are subsequently translocated into the organelle lumen through a dedicated CMA-associated lysosomal membrane receptor/translocation complex. CMA contributes to maintaining a functional proteome, through elimination of altered proteins, and participates in the cellular energetic balance through amino acid recycling. Defective or dysfunctional CMA has been associated with human pathologies such as neurodegeneration, cancer, immunodeficiency or diabetes, increasing the overall interest in methods to monitor this selective autophagic pathway. Here, we describe approaches used to study CMA in different experimental models.

Selective macroautophagy is an important protective mechanism against diverse cellular stresses. In contrast to the well-characterized starvation-induced autophagy, the regulation of selective autophagy is largely unknown. Here, we demonstrate that Huntingtin, the Huntington disease gene product, functions as a scaffold protein for selective macroautophagy but it is dispensable for non-selective macroautophagy. In Drosophila, Huntingtin genetically interacts with autophagy pathway components. In mammalian cells, Huntingtin physically interacts with the autophagy cargo receptor p62 to facilitate its association with the integral autophagosome component LC3 and with Lys-63-linked ubiquitin-modified substrates. Maximal activation of selective autophagy during stress is attained by the ability of Huntingtin to bind ULK1, a kinase that initiates autophagy, which releases ULK1 from negative regulation by mTOR. Our data uncover an important physiological function of Huntingtin and provide a missing link in the activation of selective macroautophagy in metazoans.

Chaperone-mediated autophagy (CMA), a cellular process that contributes to protein quality control through targeting of a subset of cytosolic proteins to lysosomes for degradation, undergoes a functional decline with age. We have used a mouse model with liver-specific defective CMA to identify changes in proteostasis attributable to reduced CMA activity in this organ with age. We have found that other proteolytic systems compensate for CMA loss in young mice which helps to preserve proteostasis. However, these compensatory responses are not sufficient for protection against proteotoxicity induced by stress (oxidative stress, lipid challenges) or associated with aging. Livers from old mice with CMA blockage exhibit altered protein homeostasis, enhanced susceptibility to oxidative stress and hepatic dysfunction manifested by a diminished ability to metabolize drugs, and a worsening of the metabolic dysregulation identified in young mice. Our study reveals that while the regulatory function of CMA cannot be compensated for in young organisms, its contribution to protein homeostasis can be handled by other proteolytic systems. However, the decline in the compensatory ability identified with age explains the more severe consequences of CMA impairment in older organisms and the contribution of CMA malfunction to the gradual decline in proteostasis and stress resistance observed during aging.

Ca2+ signals were reported to control lipid homeostasis, but the Ca2+ channels and pathways involved are largely unknown. Store-operated Ca2+ entry (SOCE) is a ubiquitous Ca2+ influx pathway regulated by stromal interaction molecule 1 (STIM1), STIM2, and the Ca2+ channel ORAI1. We show that SOCE-deficient mice accumulate pathological amounts of lipid droplets in the liver, heart, and skeletal muscle. Cells from patients with loss-of-function mutations in STIM1 or ORAI1 show a similar phenotype, suggesting a cell-intrinsic role for SOCE in the regulation of lipid metabolism. SOCE is crucial to induce mobilization of fatty acids from lipid droplets, lipolysis, and mitochondrial fatty acid oxidation. SOCE regulates cyclic AMP production and the expression of neutral lipases as well as the transcriptional regulators of lipid metabolism, peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC-1α), and peroxisome proliferator-activated receptor α (PPARα). SOCE-deficient cells upregulate lipophagy, which protects them from lipotoxicity. Our data provide evidence for an important role of SOCE in lipid metabolism.

Summary Nutrient deprivation is a stimulus shared by both autophagy and the formation of primary cilia. The recently discovered role of primary cilia in nutrient sensing and signaling motivated us to explore the possible functional interactions between this signaling hub and autophagy. Here we show that part of the molecular machinery involved in ciliogenesis also participates in the early steps of the autophagic process. Signaling from the cilia, such as that from the Hedgehog pathway, induces autophagy by acting directly on essential autophagy-related proteins strategically located in the base of the cilium by ciliary trafficking proteins. While abrogation of ciliogenesis partially inhibits autophagy, blockage of autophagy enhances primary cilia growth and cilia-associated signaling during normal nutritional conditions. We propose that basal autophagy regulates ciliary growth through the degradation of proteins required for intraflagellar transport. Compromised ability to activate the autophagic response may underlie the basis of some common ciliopathies.

Author manuscript; available in PMC 2017 June 14.-- et al., Calorie restriction (CR) is the most robust non-genetic intervention to delay aging. However, there are a number of emerging experimental variables that alter CR responses. We investigated the role of sex, strain, and level of CR on health and survival in mice. CR did not always correlate with lifespan extension, although it consistently improved health across strains and sexes. Transcriptional and metabolomics changes driven by CR in liver indicated anaplerotic filling of the Krebs cycle together with fatty acid fueling of mitochondria. CR prevented age-associated decline in the liver proteostasis network while increasing mitochondrial number, preserving mitochondrial ultrastructure and function with age. Abrogation of mitochondrial function negated life-prolonging effects of CR in yeast and worms. Our data illustrate the complexity of CR in the context of aging, with a clear separation of outcomes related to health and survival, highlighting complexities of translation of CR into human interventions., This work was supported in part by the Intramural Research Program of the National Institute on Aging, NIH, and by NIH grants R01 AG043483 and R01 DK098656 (J.A.B.), NIH grant AG031782 (A.M.C.), the Proteostasis of Aging Core AG038072 (A.M.C.). J.M.M. was supported by a postdoctoral fellowship from the American Diabetes Association, grant 1-15-MI-03. P.C. was supported by NIH grants (1P01AG034906, 1R01GM090311, 1R01ES 020812). F.M. is grateful to the FWF for grants LIPOTOX, I1000, P 27893, P 29203 and P24381-B20 and the BMWFW for grants “Unconventional research” and «Flysleep (80.109/0001 -WF/V/3b/2015). JMV was supported by the Spanish Ministerio de Economía y Competitividad (grants BFU2011-23578 and BFU2015-64630-R). The authors thank the personnel from the Servicio Centralizado de Apoyo a la Investigación (SCAI; University of Córdoba) for technical support.

Poorly differentiated and anaplastic thyroid carcinomas are very aggressive, almost invariably lethal neoplasms for which no effective treatment exists. These tumors are intrinsically resistant to cell death, even when their driver oncogenic signaling pathways are inhibited. We have undertaken a detailed analysis, in mouse and human thyroid cancer cells, of the mechanism through which Obatoclax, a pan-inhibitor of the anti-apoptotic proteins of the BCL2 family, effectively reduces tumor growth in vitro and in vivo. We demonstrate that Obatoclax does not induce apoptosis, but rather necrosis of thyroid cancer cells, and that non-transformed thyroid cells are significantly less affected by this compound. Surprisingly, we show that Obatoclax rapidly localizes to the lysosomes and induces loss of acidification, block of lysosomal fusion with autophagic vacuoles, and subsequent lysosomal permeabilization. Notably, prior lysosome neutralization using different V-ATPase inhibitors partially protects cancer cells from the toxic effects of Obatoclax. Although inhibition of autophagy does not affect Obatoclax-induced cell death, selective down-regulation of ATG7, but not of ATG5, partially impairs Obatoclax effects, suggesting the existence of autophagy-independent functions for ATG7. Strikingly, Obatoclax killing activity depends only on its accumulation in the lysosomes, and not on its interaction with BCL2 family members. Finally, we show that also other lysosome-targeting compounds, Mefloquine and LLOMe, readily induce necrosis in thyroid cancer cells, and that Mefloquine significantly impairs tumor growth in vivo, highlighting a clear vulnerability of these aggressive, apoptosis-resistant tumors that can be therapeutically exploited.

Autophagy delivers cytosolic components to lysosomes for degradation and is thus essential for cellular homeostasis and to cope with different stressors. As such, autophagy counteracts various human diseases and its reduction leads to aging-like phenotypes. Macroautophagy (MA) can selectively degrade organelles or aggregated proteins, whereas selective degradation of single proteins has only been described for chaperone-mediated autophagy (CMA) and endosomal microautophagy (eMI). These 2 autophagic pathways are specific for proteins containing KFERQ-related targeting motifs. Using a KFERQ-tagged fluorescent biosensor, we have identified an eMI-like pathway in Drosophila melanogaster. We show that this biosensor localizes to late endosomes and lysosomes upon prolonged starvation in a KFERQ- and Hsc70-4- dependent manner. Furthermore, fly eMI requires endosomal multivesicular body formation mediated by ESCRT complex components. Importantly, induction of Drosophila eMI requires longer starvation than the induction of MA and is independent of the critical MA genes atg5, atg7, and atg12. Furthermore, inhibition of Tor signaling induces eMI in flies under nutrient rich conditions, and, as eMI in Drosophila also requires atg1 and atg13, our data suggest that these genes may have a novel, additional role in regulating eMI in flies. Overall, our data provide the first evidence for a novel, starvation-inducible, catabolic process resembling endosomal microautophagy in the Drosophila fat body.

Connexins modulate intercellular communication when assembled in gap junctions. Compromised macroautophagy increases cellular communication due to failure to degrade connexins at gap junctions. Nedd4-mediated ubiquitinylation of the connexin molecule is required to trigger its autophagy-dependent internalization and degradation., Different pathways contribute to the turnover of connexins, the main structural components of gap junctions (GJs). The cellular pool of connexins targeted to each pathway and the functional consequences of degradation through these degradative pathways are unknown. In this work, we focused on the contribution of macroautophagy to connexin degradation. Using pharmacological and genetic blockage of macroautophagy both in vitro and in vivo, we found that the cellular pool targeted by this autophagic system is primarily the one organized into GJs. Interruption of connexins' macroautophagy resulted in their retention at the plasma membrane in the form of functional GJs and subsequent increased GJ-mediated intercellular diffusion. Up-regulation of macroautophagy alone is not sufficient to induce connexin internalization and degradation. To better understand what factors determine the autophagic degradation of GJ connexins, we analyzed the changes undergone by the fraction of plasma membrane connexin 43 targeted for macroautophagy and the sequence of events that trigger this process. We found that Nedd4-mediated ubiquitinylation of the connexin molecule is required to recruit the adaptor protein Eps15 to the GJ and to initiate the autophagy-dependent internalization and degradation of connexin 43. This study reveals a novel regulatory role for macroautophagy in GJ function that is directly dependent on the ubiquitinylation of plasma membrane connexins.

Huntington disease (HD) is caused by a unique mutation, an abnormal expansion of a polyglutamine (polyQ) tract in the HTT (huntingtin) protein. It has long been hypothesized that in addition to gained toxicity from the expanded polyQ, loss of HTT's normal cellular functions also contributes to HD pathogenesis. Consistently, wild-type HTT has a well-documented neuronal protective activity and is essential for postnatal neuronal survival. However, despite its relatively simple genetic cause, the etiology of HD remains unclear, due in part to the poor understanding of the physiological cellular functions of HTT. The perplexing HTT is a large ∼3,144 amino acid-long protein with ubiquitous localization, but it lacks any known functional domain that could provide clues about its cellular activities. The phenotypes of HTT knockout (KO) mice are equally puzzling: homozygote HTT KO mice die by day 7.5, but this early embryonic lethality is due to a critical role of HTT in extraembryonic membranes, not in the embryo per se, as it can be rescued if wild-type HTT is provided in extraembryonic tissues. HTT has a vast number of reported interacting partners that have been used to infer some of the growing list of cellular pathways that HTT could participate in. However, it is still uncertain how HTT achieves its well-documented neuroprotective role. Using both Drosophila and mammalian experimental models, we recently demonstrated that HTT has an essential function in selective autophagy where it serves as a scaffold by modulating the activities of the cargo receptor SQSTM1/p62 and the autophagy initiation kinase ULK1. We previously created a null deletion mutant (htt-ko) of the single HTT homolog (htt) in Drosophila and showed that in contrast to mouse, htt-ko flies, which develop ex utero, are fully viable with only mild aging-related defects. Unexpectedly, ectopic expression of a truncated form of the mammalian MAPT induced severe defects in htt-ko flies, suggesting that htt protects against pathogenic MAPT toxicity. Further, in genetic screens using this MAPT-induced phenotype as a functional readout, we detected dosage-sensitive genetic interaction between htt-ko and several components of the autophagy pathway, including atg8a (MAP1LC3A homolog), atg1 (ULK1 homolog) and ref(2)P (SQSTM1/p62 homolog), thus unveiling a functional link between HTT and autophagy. HTT is not a foreigner to the autophagy field, although the main emphasis has been on the toxic effect of mutant HTT on this cellular clearance mechanism. In fact, our earlier work in HD demonstrated that reduced autophagy in the disease context, also reported by many other groups, originated from diminished ability to “trap” cytosolic cargo. We attributed the “empty autophagosomes” phenotype in HD cells to defective cargo recognition due to the presence of mutant polyQ-HTT in the inner part of the closing autophagosomes. However, our genetic studies ablating the wild-type HTT made us reconsider this proposed gain-of-toxicity function. In this recent study, we have found that in both htt-ko flies and HTT-depleted mammalian cells, autophagic abnormalities are present but surprisingly, starvation-induced autophagy is largely normal. However, loss of HTT compromised autophagic induction when challenged by several other stresses, including proteotoxicity, lipotoxicity, and mitochondria damage. In all these instances, mammalian cells depleted of HTT also showed an “empty autophagosomes” defect, suggesting that wild-type HTT is required for efficient cargo recognition by the autophagosome. We found that HTT and SQSTM1/p62, as well as their Drosophila counterparts Htt and Ref(2)P, physically interact and that proteotoxic stress promotes this interaction. Depletion of HTT reduces the association of SQSTM1 with MAP1LC3A and also compromises the binding of SQSTM1 with proteins with lysine-63-linked ubiquitin (K63-Ub) chains, which are preferential substrates of autophagy. However, loss of HTT does not affect self-polymerization of SQSTM1 or its association with K48-Ub-modified proteins mainly cleared by the proteasome. Collectively, these findings support the idea that HTT facilitates cargo recognition by modulating the assembly of the cargo receptors and autophagy proteins. We also found that the dependence on HTT for the initiation of stress-induced selective autophagy is related to its physical interaction with ULK1, whose kinase activity is essential for autophagy initiation. HTT depletion does not affect starvation-induced activation of ULK1 kinase, but compromises ULK1 activation upon proteotoxicity challenge, revealing a contribution of HTT to differentially regulating autophagosome biogenesis under basal or stress conditions. We found that the regulation of HTT on ULK1 is at the level of its interaction with the MTORC1 complex, another main regulator of ULK1 that binds to and inactivates ULK1 under nutrient-rich conditions. We showed that (1) ULK1 exists in 2 mutually exclusive complexes, ULK1-HTT and ULK1-MTORC1; (2) HTT does not affect the kinase activity of MTORC1; (3) HTT competes with MTORC1 for binding with ULK1; (4) stresses that induce selective autophagy (e.g., proteotoxicity, lipotoxicity, or mitophagy), but not starvation, result in an increased association of ULK1 with HTT at the expense of MTOR, thus freeing ULK1 from its inhibition by MTORC1. Collectively, HTT promotes selective autophagy by activating and bringing together SQSTM1/p62 and ULK1 to assure spatial proximity between the cargo and autophagy initiation components, thereby orchestrating 2 major autophagy steps: cargo recognition and autophagy induction (Fig. 1). Figure 1. Model of HTT in promoting selective autophagy. HTT serves as a scaffolding for selective autophagy by bringing together cargo bound through SQSTM1 and an initiator of autophagy, ULK1 kinase. Basal autophagy: under basal conditions, binding of HTT to the ... Increasing evidence supports a tangled relationship between HTT, HD, and autophagy. Thus, after the first report of altered autophagy in HD by DiFiglia, the Holzbaur lab showed that HTT facilitates axonal trafficking of autophagosomes, a function that is compromised by polyQ-HTT; Hayden's group reported an autophagy-inducing domain within HTT; Steffan with Thompson and colleagues also recently reported physical interactions between HTT and several autophagy proteins including SQSTM1 and ULK1. Our finding places HTT in the core of the autophagic process, bringing together components of the cargo recognition and autophagy initiation complexes, and raising many new interesting questions. How is HTT differentially activated upon different stress challenges? Does polyQ expansion directly compromise the endogenous activities of HTT, as implicated by the very similar “empty autophagosomes” phenotypes in both HD and HTT-depleted cells, and if so, will this effect be partially responsible for the toxicity of mutant polyQ-HTT in long-lived neurons? Last, how can we exploit HTT's role in selective autophagy to modulate this process in the fight against this devastating brain disease called HD?

The success of immunizations in nearly eliminating many vaccine-preventable diseases has resulted in an increase in the need to study risks from vaccines, combination or otherwise. The well-known limitations associated with prelicensure trials have led many to hope that postlicensure studies can address safety issues. This article reviews measures that have been or should be taken to meet this expectation: establishment of clinical immunization safety assessment centers, standardization of case definitions for vaccine adverse events, use of the Vaccine Identification Standards Initiative to improve the accuracy and efficiency with which vaccination records are transferred, integration of vaccine safety monitoring into immunization registries, establishment (and enlargement) of the Vaccine Safety Datalink project, use of innovative analytic tools for better signal detection, and implementation of various methods to overcome confounding by contraindication. Only by investing in vaccine safety infrastructure at a level commensurate with investments in vaccine development can we hope to retain the public's confidence in immunization.

The plasma membrane contributes to the formation of autophagosomes, the double-membrane vesicles that sequester cytosolic cargo and deliver it to lysosomes for degradation during autophagy. In this study, we have identified a regulatory role for connexins (Cx), the main components of plasma membrane gap junctions, in autophagosome formation. We have found that plasma-membrane-localized Cx proteins constitutively downregulate autophagy through a direct interaction with several autophagy-related proteins involved in the initial steps of autophagosome formation, such as Atg16 and components of the PI(3)K autophagy initiation complex (Vps34, Beclin-1 and Vps15). On nutrient starvation, this inhibitory effect is released by the arrival of Atg14 to the Cx-Atg complex. This promotes the internalization of Cx-Atg along with Atg9, which is also recruited to the plasma membrane in response to starvation. Maturation of the Cx-containing pre-autophagosomes into autophagosomes leads to degradation of these endogenous inhibitors, allowing for sustained activation of autophagy.

Lipid modifications are essential in cellular sorting and trafficking inside cells. The role of phosphoinositides in trafficking between Golgi and endocytic/lysosomal compartments has been extensively explored and the kinases responsible for these lipid changes have been identified. In contrast, the mechanisms that mediate exit and recycling from lysosomes (Lys), considered for a long time as terminal compartments, are less understood. In this work, we identify a dynamic association of the lipid kinase PI4KIIIβ with Lys and unveil its regulatory function in lysosomal export and retrieval. We have found that absence of PI4KIIIβ leads to abnormal formation of tubular structures from the lysosomal surface and loss of lysosomal constituents through these tubules. We demonstrate that the kinase activity of PI4KIIIβ is necessary to prevent this unwanted lysosomal efflux under normal conditions, and to facilitate proper sorting when recycling of lysosomal material is needed, such as in the physiological context of lysosomal reformation after prolonged starvation.

α-Defensins are antimicrobial peptides that contribute to innate-immune functions of neutrophils and intestinal Paneth cells. Transcription of α-defensin genes occurs early in neutrophilic myelopoeisis. To examine the mechanisms that regulate α-defensin gene expression, we analyzed transcription of rat neutrophil α-defensin NP-3 in D4 cells, a subclone of the promyelocytic cell lne IPC-81. Northern blot analysis showed that D4 cells express fivefold higher levels of α-defensin mRNA than the parental cell line in a manner relatively independent of passage number. Increased levels of steady-state mRNA in D4 cells correlated with markedly elevated peptide levels detected by immunocytochemical staining. To identify the cis-acting DNA elements involved in tissue-specific expression, D4 cells were transfected with luciferase reporter constructs containing NP-3 gene 5′-flanking sequences. Analyses of transfected D4 cells demonstrated that the proximal 87 base pair (bp) sequence contained cis-acting DNA elements necessary for optimal promoter activity. Mutational analyses within the 87-bp region suggested the involvement of the CAAT box and a putative polyoma enhancer-binding protein 2/core-binding factor (PEBP2/CBF) site in defensin gene transcription. Transient transfection analyses using tandem repeats of oligonucleotides containing these sequences demonstrated that proximity of the CAAT box and PEBP2/CBF site was important for defensin promoter activity. Electrophoretic mobility shift assays indicated that PEBP2/CBF or a PEBP2/CBF-related protein was involved in a specific protein-DNA interaction occurring within a DNA fragment containing the CAAT and PEBP2/CBF sequences. These data identify functional trans- and cis-elements that regulate rat defensin gene expression in high defensin-expressing promyelocytic cells.