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GR15 is a short molecule or peptide composed of aliphatic amino acids and possesses to have antioxidant properties. The GR15, 1GGGAFSGKDPTKVDR15 was identified from the protein S-adenosylmethionine synthase (SAMe) expressed during the sulfur departed state of Arthrospira platensis (spirulina or cyanobacteria). The in-silico assessment and the structural features of GR15 showed its antioxidant potency. Real-time PCR analysis found the up-regulation of ApSAMe expression on day 15 against oxidative stress due to 10 mM H2O2 treatment in A. platensis (Ap). The antioxidant activity of GR15 was accessed by the cell-free antioxidant assays such as ABTS, SARS, HRAS and NO; the results showed dose-dependent antioxidant activity. The toxicity assay was performed in both in vitro and in vivo models, in which peptide does not exhibit any toxicity in MDCK cell and zebrafish embryos. The intercellular ROS reduction potential of GR15 peptide was also investigated in both in vitro and in vivo models including LDH assay, antioxidant enzymes (SOD and CAT), and fluorescent staining assay (DCFDA, Hochest and Acridine orange sting) was performed; the results showed that the GR15 peptide was effectively reduced the ROS level. Further, RT-PCR demonstrated that GR15 enhanced the antioxidant property and also up-regulated the antioxidant gene, thus reduced the ROS level in both in vitro and in vivo models. Based on the results obtained from this study, we propose that GR15 has the potential antioxidant ability; hence further research can be directed towards the therapeutic product or drug development against disease caused by oxidative stress.

This study investigated the treatment effect of curry leaves extract (CLE) and moringa leaves extract (MLE) on the melanosis of Pacific white shrimp during 15 days of chilled storage. These extract...

L-carnitine (LC) and α-Ketoglutarate (AKG) are important growth promoters used in aquafeed. The study aimed to evaluate the incorporation of LC and AKG at different ratios in the diet of tilapia (initial weight 1.38 ± 0.03 g) in order to facilitate lipid utilization and protein synthesis. Fish were fed six isonitrogenous (~ 30 g/100 g CP) and isolipidic (~ 6 g/100 g CL) diets containing graded LC/AKG ratios of 0 (Control), 0.11, 0.42, 1.00, 2.33 and 9.00 in six treatments for 60 days. Fish fed with LC/AKG ratios 2.33 and 9.00 showed significantly (P

Bacterial infections are increasing in recent years and developing with more resistance to antibiotics. There is a need of designing antimicrobial peptides (AMP) against these bacterial pathogens. In this study, we derived an AMP, substance P (SP) named RM12, from tachykinin protein obtained from an earlier developed transcriptome library of a teleost, Channa striatus. This, RM12 which is similar to SP was functional against multidrug resistance bacteria (MDR) or one of the ESKAPE pathogen, Pseudomonas aeruginosa ATCC 25668 which causes nosocomial infections in human beings. The RM12 peptide sequence obtained from tachykinin protein was screened using antimicrobial prediction programs, which showed the possible antimicrobial performance of RM12, thus the peptide was synthesized with 96.83% HPLC purity. The toxicity of RM12 was analyzed using human blood cells and human dermal fibroblast (HDF) cells that showed the safeties of RM12 usage. The antibacterial activities of RM12 including antibiofilm were determined using different assays and exhibited the peptide potent against the MDR or ESKAPE pathogen, P. aeruginosa ATCC 25668. Moreover, the mechanism of action of RM12 against P. aeruginosa ATCC 25668 was determined using field emission scanning electron microscopy and fluorescence assisted cell sorter flow cytometer analysis; both the analysis confirmed bacterial membrane disruption due to RM12. Further, in vitro infectivity assays were performed in HDF cells infected with P. aeruginosa ATCC 25668 that showed the longer duration, as well as the higher concentration of RM12, reduced the bacterial viability. Hence, it can be concluded that RM12 can be used as a potent antimicrobial source against the MDR or ESKAPE pathogen, P. aeruginosa ATCC 25668; however, further clinical trials need to be carried out to find out the possibility of RM12 usage in the pharmaceutical industry.

Anthropogenic activities have degraded the marine ecosystem badly, among which microplastic (MPs) is the primary cause. The use of MPs is increasing at extraordinary haste while the recycling and reuse are very low. They are dumped in water bodies that sequentially enter the marine ecosystem. Recently scientists have observed the presence of MPs in various tissues such as the gastrointestinal tract and some immune organs. The major problem arises when it affects the human population severely. The consumption of MPs-affected fish cause accumulation in the food chain resulting in biomagnification. It affects human health by interfering with the gut microbiome, immune response, etc. We can decrease the impact of MPs by reducing their production and detecting them in aqua-consuming organisms. There are different techniques to diagnose the concentration of MPs inside marine organisms before processing. Removal of the gut of marine food organisms before consumption is also an excellent way to reduce the impact of MPs on health, but it is not possible for small fish. So, some limits should be applied to impose the production of MPs and enhance the use of biodegradable products for human health considerations. Some protocols should be set on the boundary of MPs’ concentration for fish marketing and processing.

Lectins are hemagglutinating glycoproteins which act as pathogen recognition receptors that can bind to the pathogen-associated molecular patterns. Shrimp lectin (Md-Lec) is a lectin that is reported to have antimicrobial property. In this study, the CuS nanoparticles (CuS NPs) which were previously reported to have wide range of antimicrobial activity were conjugated with Md-Lec. Thus, their minimum inhibitory concentration (MIC) against aquatic pathogens was reduced four times than that of their individual activity. Moreover, antibacterial and antibiofilm assay was performed with Md-Lec, pCuS NPs, and Md-Lec conjugated with pCuS NPs (Md-Lec-pCuS NPs) against Aeromonas hydrophila at 25, 50, and 100 μg/mL. The hydrophobicity index and EPS (extracellular polysaccharide) production of A. hydrophila were decreased after treating with Md-Lec-pCuS NPs. The non-specific immune parameters—lysozyme assay, peroxidase assay, and respiratory burst activity—were elevated considerably in the infected fishes that are treated with Md-Lec-pCuS NPs at their MIC. Further, immune gene (COX2, MyD88, and LEC) expression analysis at different time intervals was also done in the infected Etroplus suratensis that are treated with Md-Lec-pCuS NPs at 3.13 μM concentration. The results reveal that the immune gene expression was upregulated at the 6th hour of infection in the infected fish that are treated with Md-Lec-pCuS NPs (3.13 μM) and thus it can be used as a therapeutic agent which can act as an immunostimulant for the production of disease-free fishes in aquaculture industry.

The present study was designed to evaluate the health effects of dietary nanozinc prepared by two methods: conventional chemical method and green method. The parameters evaluated were the extent of bioaccumulation, antioxidant status, histological, immunological changes and DNA damage in Nile tilapia fed nanozinc feed. Zinc oxide nanoparticles were first prepared by green and chemical methods. Before feed preparation, the in vitro antioxidant activity and antibacterial activity of both types of nanoparticle solutions were tested and the results revealed enhanced activities in green synthesized ZnO NP solution. After the acclimatization period, 420 Nile tilapias were distributed randomly into 21 glass tanks with 20 fish per tank in triplicates. Fish were fed control diet without any ZnO NP and (i) GT1—green synthesized ZnO NP diet at 100 mg/kg, (ii) CT1—chemically synthesized ZnO NP diet at 100 mg/kg, (iii) GT2—green synthesized ZnO NP diet at 200 mg/kg, (iv) CT2—chemically synthesized ZnO NP diet at 200 mg/kg, (v) GT3—green synthesized ZnO NP diet at 400 mg/kg and (vi) CT3—chemically synthesized ZnO NP diet at 400 mg/kg for 60 days. After 60 days, gill and liver samples were collected for analysing oxidative stress, histopathological alterations and bioaccumulation of zinc, whereas serum samples were collected for evaluating immune response. The results revealed that the GT3 diet significantly (P < 0.05) enhanced the level of antioxidant enzymes (CAT, SOD, GPx, GR and GSH) than dietary nanozinc prepared by the chemical method. Similarly, the innate immunological parameters were significantly (P < 0.05) augmented in fish fed GT3 diet. Comparative histological study of liver and gill tissues revealed normal architecture in the tissues of fish fed green synthesized NP–enriched feed, whereas the tissues of fish fed chemically synthesized NP feed exhibited histological alterations. Bioaccumulation of zinc was more in the liver followed by the muscle and least in the gills and DNA damage was more evident in fish fed chemically synthesized ZnO NP–enriched feed. In conclusion, the results suggest that the inclusion of 400 mg/kg GT3 diet in fish diet enhanced the level of antioxidant enzymes, boosted immune response and did not cause histological damage to organs, and therefore, GT3 nanofeed can be recommended for fish health improvement.

Aim Polymicrobial biofilm encasing cross-kingdom micro-organisms are apparent in medicine, which imposes serious resistance to conventional antimicrobial treatment. The objective of the study was to explore Butea monosperma seed lectin (BMSL) conjugated antimicrobial lipid, 2-((N-[2-hydroxyethyl]palmitamido)methyl)-1-methylpyridin-1-ium iodide (cN16E) to inhibit mixed-species biofilm of uropathogenic Escherichia coli–Candida albicans. Methods and Results Antimicrobial activity and antibiofilm of cN16E and cN16E-BMSL conjugate (BcN16E) were analysed against single- and mixed microbial cultures. The minimum inhibitory concentration (MIC) indicates that the MIC of cN16E-BMSL conjugate (BcN16E) against cohabiting UPEC-C. albicans was eightfold lower than the cN16E. BcN16E affects membrane integrity to elicit antimicrobial activity. BcN16E inhibits the dual-species biofilm even with 16 times lower MIC of cN16E. BcN16E impairs the biofilm-associated virulence factors which include extracellular polysaccharides, cell surface hydrophobicity, swimming, swarming motilities, hyphal filamentous morphology, curli formation and haemolysin activity. As a proof of concept, we demonstrated BcN16E ability to inhibit dual-species biofilm formation on a urinary catheter. Conclusion The study revealed that the BcN16E is better than cN16E in impairing biofilm-associated virulence factors and exerting antimicrobial activity. Significance and Impact of the Study The findings emphasize that phytolectin has the potential to enhance the anti-virulence strategies of antimicrobials against cross-kingdom biofilm-related infections.

Among immunostimulants used in aquaculture, herbal is promising due to their propensities to improve growth performance, fish immunity, and their antimicrobial properties, as they are good alternat...

Aphanomyces invadans, an oomycyte fungus most frequently recognized as a causative agent of epizootic ulcerative syndrome (EUS) is a seasonal epidemic pathogen of great importance in wild and farme...

Immersion vaccination with a biomimetic mucoadhesive nanovaccine has been shown to induce a strong mucosal immune response against columnaris disease, a serious bacterial disease in farmed red tilapia caused by Flavobacterium columnare. However, the induction of a systemic immune response by the vaccine is yet to be investigated. Here, we examine if a specific humoral immune response is stimulated in tilapia by a biomimetic-mucoadhesive nanovaccine against Flavobacterium columnare using an indirect-enzyme-linked immunosorbent assay (ELISA), serum bactericidal activity (SBA) and the expression of immune-related genes within the head-kidney and spleen, together with assessing the relative percent survival of vaccinated fish after experimentally infecting them with F. columnare. The anti-IgM antibody titer of fish at 14 and 21 days post-vaccination was significantly higher in chitosan complex nanoemulsion (CS-NE) vaccinated fish compared to fish vaccinated with the formalin-killed vaccine or control fish, supporting the serum bactericidal activity results at these time points. The cumulative mortality of the unvaccinated control fish was 87% after challenging fish with the pathogen, while the cumulative mortality of the CS-NE vaccinated group was 24%, which was significantly lower than the formalin-killed vaccinated and control fish. There was a significant upregulation of IgM, IgT, TNF α, and IL1-β genes in the spleen and kidney of vaccinated fish. Significant upregulation of IgM and IgT genes was observed in the spleen of CS-NE vaccinated fish. The study confirmed the charged-chitosan-based mucoadhesive nanovaccine to be an effective platform for immersion vaccination of tilapia, with fish generating a humoral systemic immune response against columnaris disease in vaccinated fish.

The present study addressed the effects of Leucas aspera enriched diet in Nile tilapia. Three hundred Nile tilapia were fed Leucas aspera as follows: 0 g kg-1 L. aspera (C-control), 5 g kg-1 L. aspera (T1), 10 g kg-1 L. aspera (T2) and 15 g kg-1 L. aspera (T3). After 30 days of feeding, significant (P

GR15 is a short molecule or peptide composed of aliphatic amino acids and possesses to have antioxidant properties. The GR15

The study was conducted to investigate the effects of stachyose on immune responses, gut morphology, growth, and disease resistance in Nile tilapia (Oreochromis niloticus). Fishes were distributed randomly into fifteen 150 L glass tanks with 20 fish tank− 1 and fed control (0 g/kg), 2 g/kg, 4 g/kg, 8 g/kg, and 16 g/kg of stachyose. After eight weeks of experimental feeding, skin mucus and serum innate immune parameters (lysozyme, alternative complement, phagocytosis, peroxidase), and growth performance (weight gain, specific growth rate, feed conversion ratio) were analysed, and disease resistance against Streptococcus agalactiae was also determined. Supplementation of stachyose revealed that serum lysozyme, serum and mucus peroxidase activities, weight gain and disease resistance against Streptococcus agalactiae were significantly (P ≤ 0.05) higher compared to control fed fish. In contrast, specific growth ratio, phagocytic activity and mucus lysozyme did not show significant (P > 0.05) differences.

Fish oil and their compounds derived from the same have immense applications in the improvement of health, brain development, enhancing immunity etc. This study aimed at the supplementation of such a compound alkoxy glycerol derived from shark liver oil in fish diet and thereby analyzing growth as well as immune parameters of Oreochromis niloticus. 400 fishes were distributed into 11 glass tanks, and then fishes were weighed before starting the experiment. (Average weight was found to be 5.3 ± 0.10 g). Feed was prepared using alkoxy glycerol in the doses like 5, 10, 15 g kg−1 Fishes were fed with the prepared diet for 30 days and growth parameters like specific growth rate (SGR), weight gain (WG), final weight (FW), and feed conversion ratio (FCR) were measured. On the 30th day, fishes were challenged with 0.1 ml of normal saline solution containing 107 CFUml−1 of Aeromonas hydrophila and disease resistance was monitored. After 30 days of post challenge observation, immunological and lipid peroxidation assays like alternative complement (ACH50), phagocytosis (PI), respiratory burst activities (RB), and serum lysozyme (SL) were performed.

Serine threonine protein kinase plays an important role in the cell growth, cell cycle regulation and development which shows a significant role in signal transduction pathway. In this study, a cationic peptide IE13 was derived from serine threonine protein kinase of a teleost fish and it was modified as IW13 by replacing the C-terminal residue with tryptophan. The anticancer potential of IE13 and IW13 was tested against three different types of cell lines HeLa (Human Cervical carcinoma cells), A549 (Human lung cancer cells) and MCF 7 (Human breast cancer cells) at different concentrations (300, 100, 30 and 10 µM) in semi logarithmic range. The results showed that the peptide IW13 showed EC50 of 92 µM for MCF 7, 102 µM for A549 and 85 µM for HeLa whereas, IE13 showed less growth inhibition on the tested cell lines. The flow cytometry study was conducted to demonstrate the cell cycle inhibition by the cationic peptide IW13 against HeLa cell line. Cytotoxicity studies of the cationic peptide showed no cytotoxicity against normal cell line (RAW 264.7). Tailoring of these properties was likely to be a key in safe and successful transfer of this peptide from laboratory experiments into clinical practice for pharmaceutical formulations.

We investigated the effects of dietary enriched with Shilajit in three dose levels: 2.0, 4.0, and 6.0 g kg−1 in the basal diet on growth rate, non-specific immune response, and disease resistance for 60 days in Oreochromis mossambicus against an opportunist pathogen, Aeromonas hydrophila. The results showed that the Shilajit enriched diets at 4.0 and 6.0 g kg−1 diets significantly (p

This study investigated the effects of a combination of Leucas aspera, Oxy-cyclodextrin and sodium bentonite (LOB) on growth, digestive enzyme activity, innate immune response, haematology, and expression of immune-related genes in Nile tilapia. A total of 240 juvenile fish (20.15±0.05g) were randomly distributed into four dietary groups in triplicate and fed respective diets containing a graded level of LOB at 0 g kg-1 (Control), 0.3 g kg-1 (T1), 0.6 g kg-1 (T2) and 0.9 g kg-1 diet (T3) for 60 days. After 60 days, higher growth was observed in fish fed T2 diet (P < 0.05). Digestive enzyme activities and innate immune parameters were significantly higher in T3 group. Some of the haematological parameters reported statistically higher counts in T2 group (P

In aquaculture, diseases cause the greatest economic losses, and fungal infections have become increasingly important over the past 20 years. Fungal spores are the major source of infection in aquaculture. A fungal pathogen's capacity to induce infections depends on the presence of virulence factors. Fungal virulence molecules including glycosyl hydrolase, protease, subtilisin, kinases and kinase inhibitor can damage the susceptible host. However, the full overview of the emergence of diseases associated with fungal pathogens remains limited. This review explores the analysis from the perspective of the micro-organism through the host-fungal pathogenic interactions, which describes the virulence factors as microbial components that can harm aquatic organisms. The systematic information on such virulence molecules provides various possibilities for the development of novel therapeutics.

Effect of ethanol extracts of green tea (Camellia sinensis L.) and amla (Phyllanthus emblica Linn) were investigated on quality and melanosis of chilled stored Indian white prawn (Fenneropenaeus indicus) during 28 days. Extracts were subjected to antioxidant assays viz.1,1-diphenyl-2-picryl hydrazyl radical reducing power methods (DPPH), total antioxidant capacity (TAC), total phenolic content (TPC) and ferric reducing antioxidant power(FRAP) to evaluate antioxidant potentiality and fourier-transform infrared spectroscopy (FT-IR) to identify organic constituents. Polyphenol oxidase (PPO) inhibition was assessed to check the efficacy of the extracts as anti-melanogenic agents. Biochemical (total volatile nitrogen, free fatty acid and peroxide values), bacteriological (aerobic counts), melanosis inhibition and sensory quality of chilled stored shrimp were addressed to investigate the efficacy of extracts as preservative and anti-melanogenic remedy. Free reducing power of green tea - and amla extracts were in a range of 28.72–65.67%and 17.38–66.95%, respectively. Phenolic content level was almost same for green tea and amla extract (2.46 ± 0.002 and 2.51 ± 0.036 mg GAE/gram). Total antioxidant capacity of green tea (210.33 ± 4.63 mg EqAsc/g) was slightly higher than that of amla extracts (145.56 ± 1.98 mg EqAsc/g). FRAP value revealed that green tea(477.49 ± 3.25 mgE Fe (II)/g) had more ferric reducing power than amla (324.39 ± 5.85 mgE Fe (II)/g).FT-IR analysis revealed the presence of essential organic bioactive compounds, which play an important role in reducing lipid oxidation and quality loss, and both extracts possess an encouraging PPO inhibition ability. Treatment by green tea - and amla extracts on chilled stored shrimp showed promising effects on biochemical and microbiological parameters followed by melanosis inhibition and enhanced sensory attributes. Treated Indian white prawn with green tea – and amla extract revealed significantly (P

This study reports the antioxidant property and molecular mechanism of a tryptophan-tagged peptide derived from a teleost fish Channa striatus of serine threonine-protein kinase (STPK). The peptide was tagged with tryptophan to enhance the antioxidant property of STPK and named as IW13. The antioxidant activity of IW13 peptide was investigated using in vitro methods such as DPPH, ABTS, superoxide anion radical scavenging and hydrogen peroxide scavenging assay. Furthermore, to investigate the toxicity and dose response of IW13 peptide on antioxidant defence in vitro, L6 myotubes were induced with generic oxidative stress due to exposure of hydrogen peroxide (H2O2). IW13 peptide exposure was found to be non-cytotoxic to L6 cells in the tested concentration (10, 20, 30, 40 and 50 μM). Also, the pre-treatment of IW13 peptide decreased the lipid peroxidation level and increased glutathione enzyme activity. IW13 peptide treatment upregulated the antioxidant enzyme genes: GPx (glutathione peroxidase), GST (glutathione S transferase) and GCS (glutamine cysteine synthase), in vitro in L6 myotubes and in vivo in zebrafish larvae against the H2O2-induced oxidative stress. The results demonstrated that IW13 renders protection against the H2O2-induced oxidative stress through a cellular antioxidant defence mechanism by upregulating the gene expression, thus enhancing the antioxidant activity in the cellular or organismal level. The findings exhibited that the tryptophan-tagged IW13 peptide from STPK of C. striatus could be a promising candidate for the treatment of oxidative stress-associated diseases.

Alzheimer’s disease perpetually demands enormous research on the development of effective treatment strategies. The present study aims to define the role of Oxyresveratrol (OXY) alone and in combination with Alkoxy glycerols (AKG) to reduce Tau protein level and improve the climbing behaviour of Drosophila fly models expressed with human-Tau protein. Oxyresveratrol, a polyphenolic stilbene, possesses a wide range of biological activities like antioxidant, anti-inflammatory, and neuroprotective effects. Nevertheless, chemical instability and low solubility of OXY in aqueous solutions reduce its bioavailability and hinder it from exerting neuroprotective activities. An inclusion complex of OXY with β- cyclodextrin (CD) (OXY-CD complex) was employed in the study for increased dissolution rate and oral availability of OXY. Fish oils and their derivatives have a plethora of applications in in vivo biological activities. Herein, we also remark on the role of AKG in reducing Tau protein level in flies by enhancing OXY-CD activity. Dietary supplementation of OXY-CD together with AKG improved the learning and memory abilities during the climbing assay in Tau flies. The study highlights OXY-CD and AKG as neuroprotective agents and put forward a plausible approach towards the increased permeability of pharmacological agents across the blood-brain barrier (BBB) for the central nervous system elicited by AKG.

The concept of exosomes has been progressively changed from the status of cellular trashcans to multitasking organelles involved in many processes, including internalization, transport and transfer of macromolecules such as proteins, lipids and nucleic acids. While underpinning the mechanisms behind neurodegeneration and neuronal loss, exosomes were shown to be involved in carrying pathological misfolded proteins, propagation of β-amyloid protein and hyper-phosphorylated tau proteins across the brain that ultimately leads to the onset of Alzheimer's disease (AD), the most prevailing multifactorial neurodegenerative disorder. A potential novel therapeutic role of exosomes in AD intervention is suggested by their ability to increase Aβ clearance. This review aims to highlight the important pathological mechanisms as well as therapeutic strategies involving exosomes towards AD prevention.

Alzheimer's disease (AD ) is mounting as social and economic encumbrance which are accompanied by deficits in cognition and memory. Over the past decades, Alzheimer's disease (AD) holds the frontline as one of the biggest healthcare issues in the world. AD is an age related neurodegenerative disorder marked by a decline in memory and an impairment of cognition. Inspite of tedious scientific effort, AD is still devoid of pharmacotherapeutic strategies for treatment as well as prevention. Current treatment strategies using drugs are symbolic in nature as they treat disease manifestation though are found effective in treating cognition. Inclination of science towards naturopathic treatments aiming at preventing the disease is highly vocal. Application of marine-derived bioactive compounds, has been gaining attention as mode of therapies against AD. Inspired by the vastness and biodiversity richness of the marine environment, role of marine metabolites in developing new therapies targeting brain with special emphasis to neurodegeneration is heading as an arable field. This review summarizes select-few examples highlighted as therapeutical applications for neurodegenerative disorders with special emphasis on AD.