Search

A significant barrier to improving prevention and treatment of postpartum hemorrhage (PPH) is a lack of innovative medicines that meet the needs of women and providers, particularly those in low-and middle-income countries (LMICs). The Accelerating Innovation for Mothers (AIM) project established a new database of candidate medicines under development for five pregnancy-related conditions between 2000 and 2021.To systematically identify and rank candidates for prevention and treatment of PPH.Adis Insight, Pharmaprojects, WHO ICTRP, PubMed, and grant databases were searched to develop the AIM database.AIM database was searched for candidates being evaluated for PPH prevention and treatment, regardless of phase.Candidates were ranked as high, medium, or low potential based on prespecified criteria. Analysis was primarily descriptive, describing candidates and development potential.Of the 444 unique candidates, only 39 pertained to PPH. One was high potential (heat-stable/inhaled oxytocin) and three were medium potential (melatonin, vasopressin and dofetilide via nanoparticle delivery).The pipeline for new PPH medicines is concerningly limited, lacking diversity, and showing little evidence of novel technologies. Without significant investment in early-phase research, it is unlikely that new products will emerge.

To develop target product profiles (TPPs) for new medicines for preterm birth prevention and preterm labour management that address the real-world need of women and healthcare providers, informed by views and agreement amongst globally diverse stakeholders.Mixed methods.Global (with a focus on low- and middle-income countries, LMICs).Global stakeholders with diverse expertise in preterm labour/birth and drug development.Following an initial literature review, diverse stakeholders were invited to participate in an online international survey and in-depth interviews. The level of stakeholder agreement with TPPs was assessed, and findings from interviews were synthesised to inform the final TPPs.Level of stakeholder agreement on the minimum and preferred requirements for preterm labour/birth medicines.We performed 21 interviews. Interview participants demonstrated strong agreement on room temperature stability, no additional drug-specific clinical monitoring, and affordability in LMICs being the minimal acceptable requirements. Points of discussion were raised around the target population. Survey respondents included clinicians, researchers, funding agency staff, international public organisation staff, programme implementers, policymakers, representatives of consumer advocacy organisations and other relevant stakeholders from maternal health systems. Survey results indicated strong agreement amongst stakeholders, with only one variable in each TPP not reaching consensus (i.e. 25% disagree or strongly disagree).There is strong consensus within the preterm labour/birth community on the characteristics that new medicines for preterm birth prevention and preterm labour management must achieve. These TPPs provide necessary guidance to evaluate new candidates and their potential for implementation in a range of settings.

Objective: To investigate the compatibility of oxytocin and tranexamic acid injection products when mixed for the purpose of co-administration by intravenous infusion. Population or Sample: Oxytocin and tranexamic acid were collected from hospitals taking part in a multicentre postpartum haemorrhage treatment (E-MOTIVE) trial in Kenya, Nigeria, Tanzania, and South Africa. Methods: The compatibility of two sentinel products of oxytocin injection and tranexamic acid injection in 200mL infusion bags of both 0.9%w/v saline and Ringer’s Lactate was assessed. We analysed all tranexamic acid -oxytocin combinations, and each evaluation was conducted for up to 6hrs. Subsequently, the compatibility of multiple tranexamic acid products with reference oxytocins products when mixed in 0.9%w/v saline over a period of 1 hour was investigated. Results: We found a significant interaction between certain oxytocin and tranexamic acid products after mixing them in vitro and observing for 1 hour. The interaction substantially impacted oxytocin content leading to reduction in concentration (14.8% - 29.0%) immediately on mixing (t=0 minutes). In some combinations, the concentration continued to decline throughout the stability assessment period. Oxytocin loss was observed in 7 out of 22 (32%) combinations tested. Conclusions: In a clinical setting, mixing oxytocin and tranexamic acid may result in an underdosing of oxytocin, compromising care in an emergency life-threatening situation. The mixing of oxytocin and tranexamic acid injection products for co-administration with IV infusion fluids should be avoided until the exact nature of the interaction and its implications are understood.

To check the quality of oxytocin and tranexamic acid-two recommended products for prevention and treatment of postpartum hemorrhage (PPH)-used in facilities taking part in an implementation research project to improve PPH diagnosis and management.Between September 2020 and August 2021, oxytocin and tranexamic acid products used in the study facilities in Kenya, Nigeria, South Africa, and Tanzania were collected and transported in cold storage for analysis. Samples were analyzed according to the International (oxytocin) and British Pharmacopeia (tranexamic acid) standards.Of the 17 unique oxytocin products, 33 individual measurements were made. Only six unique products had adequate content and no related substances exceeding the recommended limits. Of 14 tranexamic acid samples, 10 showed adequate content. One product in Kenya and two products in Nigeria from different manufacturers had a high content of related substances, which classified them as substandard.While we were unable to investigate the origin regarding poor manufacturing or poor storage or both, the high number of substandard oxytocin samples is of great concern. Most of the tranexamic acid samples had adequate content but the presence of impurities in multiple products is worrying and requires further study.

Self-care interventions include over-the-counter contraceptives, which enable individuals to make informed, autonomous decisions about fertility management. As there is a substantial unmet need for contraception in many countries, increasing access by establishing sound, affordable and effective regulation of over-the-counter contraceptives could help reduce unintended pregnancies and improve maternal health. We performed a review of 30 globally diverse countries: (i) to assess national regulatory procedures for changing oral contraceptives, emergency contraceptives and injectable contraceptives from prescription-only to over-the-counter products; and (ii) to determine whether national lists of over-the-counter medicines included contraceptives. Of the 30 countries, 13 (43%) had formal regulatory procedures in place for changing prescription-only medicines to over-the-counter medicines, 11 (36%) had national lists of over-the-counter medicines, and four (13%) included contraceptives on those lists. Changing from prescription-only to over-the-counter medicines presents challenges for national medicines regulatory authorities and manufacturers, involving, for example, reporting side-effects, quality control and the often poorly-defined process of switching to over-the-counter products. To facilitate the over-the-counter availability of contraceptives, countries should consider adopting a formal regulatory procedure for reclassifying prescription-only contraceptives as over-the-counter contraceptives. Although the availability of over-the-counter contraceptives can increase users' independence and anonymity and improve access, there may also be disadvantages, such as higher out-of-pocket costs and the need for accurate self-assessment. Basic remedial actions to improve, harmonize and standardize regulatory procedures for the reclassification of contraceptives are proposed with the aim of enabling national medicines regulatory authorities to manage the switch to over-the-counter contraceptives and to control their quality.Les soins autoadministrés incluent les contraceptifs en vente libre, qui permettent aux individus de prendre des décisions réfléchies et autonomes concernant le contrôle de la fécondité. Vu le besoin criant de contraception dans de nombreux pays, faciliter l'accès en proposant des méthodes de régulation sûres, efficaces et abordables par le biais de contraceptifs en vente libre pourrait contribuer à diminuer le nombre de grossesses non désirées et à améliorer la santé maternelle. Nous avons passé en revue 30 pays aux profils variés: (i) pour évaluer les procédures réglementaires nationales visant à modifier le statut des contraceptifs oraux, d'urgence et injectables afin qu'ils soient en vente libre au lieu d'être considérés comme des médicaments sur ordonnance; et (ii) pour déterminer si les contraceptifs figuraient sur les listes nationales de médicaments en vente libre. Sur les 30 pays observés, 13 (43%) avaient mis en place des procédures réglementaires officielles en vue de modifier le statut des contraceptifs, 11 (36%) possédaient des listes nationales de médicaments en vente libre et quatre (13%) y avaient inscrit les contraceptifs. Le passage du statut de médicament sur ordonnance à celui de médicament en vente libre représente un défi pour les autorités nationales de réglementation pharmaceutique et les fabricants, notamment en matière de déclaration des effets secondaires, de contrôle de la qualité et en raison d'un processus souvent mal défini. S'ils souhaitent favoriser la disponibilité des contraceptifs en vente libre, les pays devraient envisager l'adoption d'une procédure réglementaire officielle destinée à reclassifier les contraceptifs sur ordonnance en contraceptifs en vente libre. Bien que cette disponibilité puisse accroître l'autonomie et l'anonymat des usagers et améliorer l'accès à la contraception, elle présente également des désavantages car elle entraîne une hausse des frais non remboursés et requiert une autoévaluation correcte. Le présent document formule des mesures correctrices élémentaires servant à améliorer, harmoniser et normaliser les procédures réglementaires de reclassification des contraceptifs. Objectif: permettre aux autorités nationales de réglementation pharmaceutique de superviser le passage au statut de médicament en vente libre et de contrôler la qualité.Las intervenciones de cuidado personal incluyen los anticonceptivos de venta libre, que permiten a las personas tomar decisiones informadas y autónomas sobre la gestión de la fertilidad. Dado que en muchos países existe una importante necesidad insatisfecha de anticoncepción, aumentar el acceso mediante el establecimiento de una normativa sólida, asequible y eficaz de los anticonceptivos de venta libre podría ayudar a reducir los embarazos no deseados y mejorar la salud materna. Se realizó una revisión de 30 países de todo el mundo: (i) para evaluar los procedimientos normativos nacionales relativos al cambio de los anticonceptivos orales, los anticonceptivos de urgencia y los anticonceptivos inyectables de medicamentos de venta con receta a productos de venta libre; y (ii) para determinar si las listas nacionales de medicamentos de venta libre incluían los anticonceptivos. De los 30 países, 13 (43 %) contaban con procedimientos normativos formales para el cambio de medicamentos de venta con receta a medicamentos de venta libre, 11 (36 %) tenían listas nacionales de medicamentos de venta libre, y cuatro (13 %) incluían los anticonceptivos en esas listas. El cambio de los medicamentos de venta con receta a los de venta libre supone un desafío para las autoridades nacionales de regulación de medicamentos y para los fabricantes, ya que implica, por ejemplo, la notificación de los efectos secundarios, el control de calidad y el proceso, que suele estar mal definido, de pasar a los productos de venta libre. Para facilitar la disponibilidad de los anticonceptivos sin receta, los países deberían considerar la adopción de un procedimiento normativo formal para reclasificar los anticonceptivos de venta con receta como anticonceptivos de venta sin receta. Aunque la disponibilidad de los anticonceptivos de venta libre puede aumentar la independencia y el anonimato de los usuarios y mejorar el acceso, también puede haber desventajas, como los mayores costos de bolsillo y la necesidad de una autoevaluación precisa. Se proponen acciones correctivas básicas para mejorar, armonizar y estandarizar los procedimientos normativos para la reclasificación de los anticonceptivos, con el objetivo de que las autoridades nacionales de regulación de medicamentos puedan gestionar el cambio a los anticonceptivos sin receta y controlar su calidad.تشمل تدخلات الرعاية الذاتية وسائل منع الحمل دون وصفة طبية، والتي تتيح للأفراد اتخاذ قرارات مستنيرة ومستقلة بخصوص التعامل مع الخصوبة. نظرًا لوجود حاجة كبيرة لوسائل منع الحمل لم يتم تلبيتها في العديد من الدول، فإن زيادة الحصول عليها عن طريق وضع نظام صحيح وفعال بتكلفة في المتناول لوسائل منع الحمل دون وصفة طبية، بحيث يمكنه أن يساعد في تقليل حالات الحمل غير المرغوب فيه، وتحسين صحة الأم. قم بإجراء مراجعة لـ 30 دولة متنوعة عالميًا: (1) لتقييم الإجراءات التنظيمية الوطنية لتغيير وسائل منع الحمل الفموية، ووسائل منع الحمل في حالات الطوارئ، ووسائل منع الحمل القابلة للحقن، من منتجات تُصرف بوصفة طبية فقط إلى منتجات التي لا تحتاج لوصفة طبية؛ و(2) لتحديد ما إذا كانت القوائم الوطنية للأدوية التي لا تحتاج لوصفة طبية تشمل وسائل منع الحمل. من بين 30 دولة، كان لدى 13 دولة (43%) إجراءات تنظيمية رسمية قيد التنفيذ لتغيير الأدوية التي تُصرف بوصفة طبية فقط، إلى أدوية لا تحتاج لوصفة طبية، وكان لدى 11 دولة (36%) قوائم وطنية للأدوية التي لا تحتاج لوصفة طبية، وأربع دول (13%) أدرجت وسائل منع الحمل في تلك القوائم. إن التغيير من أدوية تُصرف فقط بوصفة طبية إلى أدوية تحتاج لوصفة طبية يمثل تحديات للسلطات التنظيمية وجهات تصنيع الأدوية الوطنية، بما في ذلك، على سبيل المثال، الإبلاغ عن الآثار الجانبية، ومراقبة الجودة، والعملية غير الواضحة غالبًا للتحول إلى منتجات لا تحتاج لوصفة طبية. لتسهيل توافر وسائل منع الحمل التي لا تحتاج لوصفة طبية، يجب على الدول النظر في اتباع إجراء تنظيمي رسمي لإعادة تصنيف وسائل منع الحمل التي تصرف بوصفة طبية فقط، باعتبارها وسائل لمنع الحمل لا تحتاج لوصفة طبية. بالرغم من أن وسائل منع الحمل التي لا تحتاج لوصفة طبية يمكن أن يزيد توافرها من استقلالية المستخدمين وإخفاء هويتهم ويُحسّن الحصول عليها، إلا أنه قد تكون هناك أيضًا بعض العيوب، مثل ارتفاع التكاليف الشخصية، والحاجة إلى تقييم ذاتي دقيق. تم اقتراح إجراءات علاجية أساسية لتحسين ومواءمة وتوحيد الإجراءات التنظيمية لإعادة تصنيف وسائل منع الحمل، بهدف تمكين السلطات التنظيمية الوطنية للأدوية من إدارة التحول إلى وسائل منع الحمل التي لا تحتاج لوصفة طبية ومراقبة جودتها.包括非处方避孕药的自我保健干预可以使个人就节制生育做出知情、自主的决定。由于许多国家存在大量未满足的避孕需求，因此通过建立健全、负担得起和有效的非处方避孕药监管程序来增加药品可及性，有助于降低意外怀孕的几率和改善孕产妇健康状况。我们对全球 30 个不同的国家进行了审查：(I) 以评估将口服避孕药、紧急避孕药和注射避孕药从处方药改为非处方药的国家监管程序；(ii) 以确定国家非处方药品清单中是否包括避孕药。在 30 个国家中，13 (43%) 个国家有将处方药改为非处方药的正式监管程序，11 (36%) 个国家有非处方药品清单，其中 4 (13%) 个国家的药品清单上包括避孕药。将处方药改为非处方药对许多国家药品监管机构和制药商提出了挑战，例如，包括报告副作用、质量控制以及通常不太明确的转换为非处方药的流程。为促进非处方避孕药的供应，各国应考虑制定将处方避孕药重新分类为非处方药避孕药的正式监管程序。尽管非处方避孕药的供应可以提高使用者的独立性、匿名性并提高药品普及性，但它仍有缺点，例如较高的自付费用以及需要准确的自我评估。提出改进、统一和标准化避孕药重新分类监管程序的基本补救措施，目的是使国家药品监管机构能够管理转换为非处方避孕药的程序并控制药品质量。.Вмешательства с целью самопомощи включают в себя безрецептурные противозачаточные средства, которые позволяют людям принимать обоснованные самостоятельные решения в отношении управления рождаемостью. Поскольку во многих странах имеет место существенная неудовлетворенная потребность в противозачаточных средствах, расширение доступа путем установления надежного, доступного и эффективного регулирования безрецептурных противозачаточных средств может помочь сократить число нежелательных беременностей и улучшить материнское здоровье. Авторы провели обзор 30 разных стран мира, а также: (i) оценили национальные нормативные процедуры по переводу оральных, экстренных и инъекционных контрацептивов из категории средств, отпускаемых только по рецепту, в категорию безрецептурных и (ii) определили, включены ли противозачаточные средства в национальные списки безрецептурных лекарств. В 13 (43%) из 30 стран существовали официальные нормативные процедуры для перевода лекарств из категории отпускаемых только по рецепту в категорию отпускаемых без рецепта, в 11 странах (36%) были национальные списки безрецептурных лекарств, а четыре страны (13%) включили контрацептивы в такие списки. Переход от лекарств, отпускаемых только по рецепту, к лекарствам, отпускаемым без рецепта, создает проблемы для национальных органов регулирования в области лекарственных средств и производителей лекарственных средств, затрагивая, например, отчетность о побочных эффектах, контроль качества и часто слабо определяемый процесс перехода на безрецептурные препараты. Чтобы облегчить доступность противозачаточных средств, отпускаемых без рецепта, странам следует рассмотреть вопрос о принятии официальной нормативной процедуры для реклассификации противозачаточных средств, отпускаемых только по рецепту, в противозачаточные средства, отпускаемые без рецепта. Хотя наличие безрецептурных противозачаточных средств может повысить независимость и анонимность пользователей и улучшить доступ, они также могут иметь недостатки, такие как более высокие расходы из собственных средств и необходимость точной оценки своего состояния. Предлагаются основные корректирующие меры по совершенствованию, гармонизации и стандартизации нормативных процедур реклассификации противозачаточных средств с целью предоставления национальным органам по регулированию обращения лекарственных средств возможности управлять переходом на безрецептурные противозачаточные средства и контролировать их качество.

An amendment to this paper has been published and can be accessed via the original article.

Self-care interventions and remote care offer innovative and equitable ways to strengthen access to sexual and reproductive health services. Self-isolation during COVID-19 provided the opportunity for obstetric facilities and healthcare providers to integrate and increase the usage of interventions for self-care and remote care for pregnant women and to improve the quality of care overall.

Waddlia chondrophila is an emerging intracellular pathogen belonging to the order of Chlamydiales, and was previously associated with adverse pregnancy outcomes, as well as tubal factor infertility (TFI). In this study, we investigate the link between both W. chondrophila and Chlamydia trachomatis IgG seropositivity and TFI. Antibodies against both bacteria were measured in 890 serum samples of women visiting a fertility clinic. After a hysterosalpingography and/or laparoscopy, they were classified as either TFI-negative (TFI&minus, ) or TFI-positive (TFI+). The total seroprevalence was 13.4% for C. trachomatis and 38.8% for W. chondrophila. C. trachomatis antibodies were present significantly more often in the TFI+ group than in the TFI&minus, group, while for W. chondrophila no difference could be observed. In conclusion, our study confirms the association between C. trachomatis seropositivity and TFI, but no association was found between W. chondrophila seropositivity and TFI. The high percentage of W. chondrophila seropositivity in all women attending a fertility clinic does, however, demonstrate the need for further research on this Chlamydia-like bacterium and its possible role in infertility.

Waddlia chondrophila is an emerging intracellular pathogen belonging to the order of Chlamydiales, and was previously associated with adverse pregnancy outcomes, as well as tubal factor infertility (TFI). In this study, we investigate the link between both W. chondrophila and Chlamydia trachomatis IgG seropositivity and TFI. Antibodies against both bacteria were measured in 890 serum samples of women visiting a fertility clinic. After a hysterosalpingography and/or laparoscopy, they were classified as either TFI-negative (TFI−) or TFI-positive (TFI+). The total seroprevalence was 13.4% for C. trachomatis and 38.8% for W. chondrophila. C. trachomatis antibodies were present significantly more often in the TFI+ group than in the TFI− group, while for W. chondrophila no difference could be observed. In conclusion, our study confirms the association between C. trachomatis seropositivity and TFI, but no association was found between W. chondrophila seropositivity and TFI. The high percentage of W. chondrophila seropositivity in all women attending a fertility clinic does, however, demonstrate the need for further research on this Chlamydia-like bacterium and its possible role in infertility.

Purpose of review This review provides an update on the roles of Chlamydia trachomatis and the related Waddlia chondrophila and Parachlamydia acanthamoebae in miscarriage, stillbirths and preterm labour in humans. A broad audience, including microbiologist, infectiologists, obstetricians and gynaecologists, should be aware of the potential threat of these Chlamydiales for human reproduction. Recent findings Despite increasing laboratory techniques and possibilities to perform diagnostic tests, the cause of miscarriage is only identified in 50% of the cases. Intracellular bacteria, such as C. trachomatis and Chlamydia-related bacteria, are difficult to detect in routine clinical samples and could represent possible agents of miscarriages. C. trachomatis is considered the world largest sexual transmitted bacterial agent and is associated with adverse pregnancy outcome in human. In the last decade Chlamydia-like organisms, such as W. chondrophila and P. acanthamoebae, have also been associated with adverse pregnancy outcomes in human and/or animals. Summary We review here the current evidences for a pathogenic role in humans, the diagnostic approaches and possible treatment options of C. trachomatis, W. chondrophila and P. acanthamoebae.

Contains fulltext : 172623.pdf (Publisher’s version ) (Closed access) Coxiella burnetii, the causative agent of Q fever, is recognized by TLR2. TLR10 can act as an inhibitory receptor on TLR2-derived immune responses. Therefore, we investigated the role of TLR10 on C. burnetii-induced cytokine production and assessed whether genetic polymorphisms in TLR10 influences the development of chronic Q fever. HEK293 cells, transfected with TLR2, TLR10 or TLR2/TLR10, and human peripheral blood mononuclear cells (PBMCs) in the presence of anti-TLR10, were stimulated with C. burnetii. In both assays, the absence of TLR10 resulted in increased cytokine responses after C. burnetii stimulation. In addition, the effect of single nucleotide polymorphisms (SNPs) in TLR10 was examined in healthy volunteers whose PBMCs were stimulated with C. burnetii Nine Mile or the Dutch outbreak isolate C. burnetii 3262. Individuals bearing SNPs in TLR10 displayed increased cytokine production upon C. burnetii 3262 stimulation. Furthermore, 139 chronic Q fever patients and 220 controls were genotyped for TLR10 N241H, I775V and I369L. None of these polymorphisms were associated with increased susceptibility to chronic Q fever. In conclusion, TLR10 has an inhibitory effect on in vitro cytokine production by C. burnetii, but the presence of TLR10 polymorphisms does not lead to an increased risk of developing chronic Q fever.

© The Author(s) 2018. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/., Invasive aspergillosis (IA) is a severe infection that can occur in severely immunocompromised patients. Efficient immune recognition of Aspergillus is crucial to protect against infection, and previous studies suggested a role for NOD2 in this process. However, thorough investigation of the impact of NOD2 on susceptibility to aspergillosis is lacking. Common genetic variations in NOD2 has been associated with Crohn's disease and here we investigated the influence of these genetic variations on the anti-Aspergillus host response. A NOD2 polymorphism reduced the risk of IA after hematopoietic stem-cell transplantation. Mechanistically, absence of NOD2 in monocytes and macrophages increases phagocytosis leading to enhanced fungal killing, conversely, NOD2 activation reduces the antifungal potential of these cells. Crucially, Nod2 deficiency results in resistance to Aspergillus infection in an in vivo model of pulmonary aspergillosis. Collectively, our data demonstrate that genetic deficiency of NOD2 plays a protective role during Aspergillus infection., F.L.v.d.V. was supported by the E-rare project EURO-CMC. M.O. was supported by the NWO, 016.176.006). A.C. and C.C. were supported by the Northern Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (FEDER) (NORTE-01-0145-FEDER-000013), and the Fundação para a Ciência e Tecnologia (FCT) (IF/00735/2014 to A.C. and SFRH/BPD/96176/2013 to C.C.).

STUDY QUESTION What is the impact of Waddlia chondrophila, an emerging Chlamydia-related bacterium associated with miscarriage, on human spermatozoa? SUMMARY ANSWER W. chondrophila had a negative impact on human spermatozoa (decrease in viability and mitochondrial membrane potential) and was not entirely removed from infected samples by density gradient centrifugation. WHAT IS KNOWN ALREADY Bacterial infection or colonization might have a deleterious effect on male fertility. Waddlia chondrophila was previously associated with miscarriage, but its impact on male reproductive function has never been studied. STUDY DESIGN SIZE, DURATION An in vitro model of human spermatozoa infection was used to assess the effects of W. chondrophila infection. Controls included Chlamydia trachomatis serovar D and latex beads with similar size to bacteria. PARTICIPANTS/MATERIALS, SETTING, METHODS Purified motile spermatozoa were infected with W. chondrophila (multiplicity of infection of 1). Immunohistochemistry combined with confocal microscopy was used to evaluate how bacteria interact with spermatozoa. The impact on physiology was assessed by monitoring cell viability, mitochondrial membrane potential and DNA fragmentation. MAIN RESULTS AND THE ROLE OF CHANCE Using super-resolution confocal microscopy, bacteria were localized on spermatozoa surface, as well as inside the cytoplasm. Compared to controls, W. chondrophila caused a 20% increase in mortality over 72 h of incubation (P < 0.05). Moreover, higher bacterial loads significantly reduced mitochondrial membrane potential. Bacteria present on spermatozoa surface were able to further infect a cell-monolayer, indicating that sperm might vector bacteria during sexual intercourse. LIMITATIONS REASONS FOR CAUTION The main limitation of the study is the use of an in vitro model of infection, which might be too simplistic compared to an actual infection. An animal model of infection should be developed to better evaluate the in vivo impact of W. chondrophila. WIDER IMPLICATIONS OF THE FINDINGS Intracellular bacteria, including C. trachomatis, Mycoplasma spp. and Ureaplasma spp., are associated with male infertility. Waddlia chondrophila might represent yet another member of this group, highlighting the need for more rigorous microbiological analysis during investigations for male infertility. STUDY FUNDING/COMPETING INTEREST(S) This work has been funded by the Department of Obstetrics and Gynecology, Lausanne University Hospital, Switzerland, and by the Swiss National Science Foundation (Grant nos. 310030-156169/1, 320030-169853/1 and 320030-169853/2 attributed to D.B.). D.B. is also supported by the ‘Fondation Leenaards' through the ‘Bourse pour la relève académique', by the ‘Fondation Divesa' and by the ‘Loterie Romande'. No conflicts of interest to declare.

Contains fulltext : 174719.pdf (Publisher’s version ) (Closed access) Coxiella burnetii is the causative agent of Q fever. Although the prevalence of C. burnetii in cattle is much higher than in goats and sheep, infected cattle are rarely associated with human outbreaks. We investigated whether the immune response of humans differs after contact with C. burnetii isolates from different host origins or with different multilocus variable number of tandem repeat analysis (MLVA) genotypes. Cytokine responses were measured in human peripheral blood mononuclear cells (PBMCs) stimulated with 16 C. burnetii isolates with known MLVA genotype from goats, sheep, cattle, acute and chronic Q fever patients. Coxiella burnetii isolates originating from cattle induce significantly more IL-1beta, TNF-alpha and IL-22 than the isolates from goats, sheep or chronic Q fever patients. Comparing the cytokine induction of the isolates based on their MVLA genotype did not reveal differences in response between the MLVA genotypes. The proinflammatory cytokine response induced in human PBMCs by C. burnetii isolates from cattle may explain the low incidence of human Q fever outbreaks caused by cattle. The cytokine profile of PBMCs stimulated with C. burnetii isolates from chronic Q fever patients resembles isolates from goats. Furthermore, cytokine responses seem to be depending on host origin than on MLVA genotype.

Contains fulltext : 171426.pdf (Publisher’s version ) (Open Access) Cells in homeostasis metabolize glucose mainly through the tricarboxylic acid cycle and oxidative phosphorylation, while activated cells switch their basal metabolism to aerobic glycolysis. In this study, we examined whether metabolic reprogramming toward aerobic glycolysis is important for the host response to Mycobacterium tuberculosis (Mtb). Through transcriptional and metabolite analysis we show that Mtb induces a switch in host cellular metabolism toward aerobic glycolysis in human peripheral blood mononuclear cells (PBMCs). The metabolic switch is TLR2 dependent but NOD2 independent, and is mediated in part through activation of the AKT-mTOR (mammalian target of rapamycin) pathway. We show that pharmacological inhibition of the AKT/mTOR pathway inhibits cellular responses to Mtb both in vitro in human PBMCs, and in vivo in a model of murine tuberculosis. Our findings reveal a novel regulatory layer of host responses to Mtb that will aid understanding of host susceptibility to Mtb, and which may be exploited for host-directed therapy.

Chitin is an important cell wall component of Aspergillus fumigatus conidia, of which hundreds are inhaled on a daily basis. Previous studies have shown that chitin has both anti- and proinflammatory properties; however the exact mechanisms determining the inflammatory signature of chitin are poorly understood, especially in human immune cells. Human peripheral blood mononuclear cells were isolated from healthy volunteers and stimulated with chitin from Aspergillus fumigatus. Transcription and production of the proinflammatory cytokine interleukin-1β (IL-1β) and the anti-inflammatory cytokine IL-1 receptor antagonist (IL-1Ra) were measured from the cell culture supernatant by quantitative PCR (qPCR) or enzyme-linked immunosorbent assay (ELISA), respectively. Chitin induced an anti-inflammatory signature characterized by the production of IL-1Ra in the presence of human serum, which was abrogated in immunoglobulin-depleted serum. Fc-γ-receptor-dependent recognition and phagocytosis of IgG-opsonized chitin was identified as a novel IL-1Ra-inducing mechanism by chitin. IL-1Ra production induced by chitin was dependent on Syk kinase and phosphatidylinositol 3-kinase (PI3K) activation. In contrast, costimulation of chitin with the pattern recognition receptor (PRR) ligands lipopolysaccharide, Pam3Cys, or muramyl dipeptide, but not β-glucan, had synergistic effects on the induction of proinflammatory cytokines by human peripheral blood mononuclear cells (PBMCs). In conclusion, chitin can have both pro- and anti-inflammatory properties, depending on the presence of pathogen-associated molecular patterns and immunoglobulins, thus explaining the various inflammatory signatures reported for chitin., IMPORTANCE Invasive aspergillosis and allergic aspergillosis are increasing health care problems. Patients get infected by inhalation of the airborne spores of Aspergillus fumigatus. A profound knowledge of how Aspergillus and its cell wall components are recognized by the host cell and which type of immune response it induces is necessary to develop target-specific treatment options with less severe side effects than the treatment options to date. There is controversy in the literature about the receptor for chitin in human cells. We identified the Fc-γ receptor and Syk/PI3K pathway via which chitin can induce anti-inflammatory immune responses by inducing IL-1 receptor antagonist in the presence of human immunoglobulins but also proinflammatory responses in the presence of bacterial components. This explains why Aspergillus does not induce strong inflammation just by inhalation and rather fulfills an immune-dampening function. While in a lung coinfected with bacteria, Aspergillus augments immune responses by shifting toward a proinflammatory reaction.

Infection of C57BL/6 mice with Plasmodium berghei ANKA induces a fatal neurological disease commonly referred to as experimental cerebral malaria. The onset of neurological symptoms and mortality depend on pathogenic CD8 + T cells and elevated parasite burdens in the brain. Here we provide clear evidence of liver damage in this model, which precedes and is independent of the onset of neurological symptoms. Large numbers of parasite-specific CD8 + T cells accumulated in the liver following P. berghei ANKA infection. However, systemic depletion of these cells at various times during infection, while preventing neurological symptoms, failed to protect against liver damage or ameliorate it once established. In contrast, rapid, drug-mediated removal of parasites prevented hepatic injury if administered early and quickly resolved liver damage if administered after the onset of clinical symptoms. These data indicate that CD8 + T cell-mediated immune pathology occurs in the brain but not the liver, while parasite-dependent pathology occurs in both organs during P. berghei ANKA infection. Therefore, we show that P. berghei ANKA infection of C57BL/6 mice is a multiorgan disease driven by the accumulation of parasites, which is also characterized by organ-specific CD8 + T cell-mediated pathology.

Contains fulltext : 153993.pdf (Publisher’s version ) (Open Access) BACKGROUND: Antibiotic treatment of chronic Q fever is cumbersome and of long duration. To monitor treatment, there is a need for alternative biomarkers. Coxiella burnetii-specific interferon (IFN)-gamma and interleukin (IL)-2 production reflect the type of effector and memory T-cell response. In chronic Q fever, C. burnetii-specific IFN-gamma production is higher and IL-2 production is lower than in individuals with past Q fever. Here we explore whether C. burnetii-specific IFN-gamma and IL-2 production correlate to treatment response. METHODS: We studied the longitudinal C. burnetii-specific IFN-gamma/IL-2 ratio in fifteen proven chronic Q fever patients. All patients were followed for at least 18 months during antibiotic treatment. Treatment was considered successful when clinical recovery was observed, a positive PCR for C. burnetii DNA in blood became persistently negative, anti-phase I IgG showed a fourfold decrease or more, and imaging techniques showed disappearance of infectious foci. RESULTS: Overall, the IFN-gamma/IL-2 ratio declined when patients experienced a successful treatment outcome. When treatment failed, IFN-gamma/IL-2 ratios did not significantly decrease. The median (+/-IQR) slope of the longitudinal IFN-gamma/IL-2 ratio with successful treatment was -2.10 (-7.02 to -0.06), and -0.15 (-1.13 to 0.25) with unsuccessful treatment (P = 0.19). Q fever endocarditis patients had higher IFN-gamma/IL-2 ratios than patients with endovascular infections. CONCLUSION: We propose that the IFN-gamma/IL-2 ratio can be used as an additional biomarker for monitoring chronic Q fever treatment, with declining ratios being indicative of successful treatment.

Contains fulltext : 153819.pdf (Publisher’s version ) (Closed access) BACKGROUND: Infection with Coxiella burnetii can lead to acute and chronic Q fever. Toll-like receptor 1 (TLR1), TLR2, TLR4, TLR6, nucleotide-binding oligomerization domain receptor 1 (NOD1), NOD2, and the mitogen-activated protein kinases are central in the innate immune response against microorganisms, but little is known about their role in the recognition of C. burnetii in humans. METHODS: Human peripheral blood mononuclear cells (PBMCs) were stimulated with C. burnetii Nine Mile and the Dutch outbreak isolate C. burnetii 3262. TLRs were inhibited using specific antibodies or antagonists. Additionally, the influence of human polymorphisms in TLRs and Nod-like receptors (NLRs) on C. burnetii-induced cytokine production was assessed. RESULTS: Inhibition of TLR2, p38, JNK, and ERK led to decreased cytokine responses in C. burnetii-stimulated human PBMCs. Humans with polymorphisms in TLR1 and NOD2 had reduced cytokine production, compared with humans with wild-type genotypes, after stimulation. Interestingly, polymorphisms in TLR6 led to decreased cytokine production after C. burnetii 3262 stimulation but not after C. burnetii Nine Mile stimulation. CONCLUSIONS: The TLR1/TLR2 heterodimer and NOD2 are important recognition receptors for the induction of cytokine responses against C. burnetii in humans. Furthermore, an interesting finding was the divergent recognition of C. burnetii Nine Mile and C. burnetii 3262.

Contains fulltext : 155344.pdf (Publisher’s version ) (Closed access) BACKGROUND: Q fever is an infection caused by Coxiella burnetii. Persistent infection (chronic Q fever) develops in 1%-5% of patients. We hypothesize that inefficient recognition of C. burnetii and/or activation of host-defense in individuals carrying genetic variants in pattern recognition receptors or adaptors would result in an increased likelihood to develop chronic Q fever. METHODS: Twenty-four single-nucleotide polymorphisms in genes encoding Toll-like receptors, nucleotide-binding oligomerization domain-like receptor-2, alphavbeta3 integrin, CR3, and adaptors myeloid differentiation primary response protein 88 (MyD88), and Toll interleukin 1 receptor domain-containing adaptor protein (TIRAP) were genotyped in 139 patients with chronic Q fever and in 220 controls with cardiovascular risk-factors and previous exposure to C. burnetii. Associations between these single-nucleotide polymorphisms and chronic Q fever were assessed by means of univariate logistic regression models. Cytokine production in whole-blood stimulation assays was correlated with relevant genotypes. RESULTS: Polymorphisms in TLR1 (R80T), NOD2 (1007fsX1), and MYD88 (-938C>A) were associated with chronic Q fever. No association was observed for polymorphisms in TLR2, TLR4, TLR6, TLR8, ITGAV, ITGB3, ITGAM, and TIRAP. No correction for multiple testing was performed because only genes with a known role in initial recognition of C. burnetii were included. In the whole-blood assays, individuals carrying the TLR1 80R-allele showed increased interleukin 10 production with C. burnetii exposure. CONCLUSIONS: Polymorphisms in TLR1 (R80T), NOD2 (L1007fsX1), and MYD88 (-938C>A) are associated with predisposition to development of chronic Q fever. For TLR1, increased interleukin 10 responses to C. burnetii in individuals carrying the risk allele may contribute to the increased risk of chronic Q fever.

Many pathogens, including viruses, bacteria, and protozoan parasites, suppress cellular immune responses through activation of type I IFN signaling. Recent evidence suggests that immune suppression and susceptibility to the malaria parasite, Plasmodium, is mediated by type I IFN; however, it is unclear how type I IFN suppresses immunity to blood-stage Plasmodium parasites. During experimental severe malaria, CD4+ Th cell responses are suppressed, and conventional DC (cDC) function is curtailed through unknown mechanisms. Here, we tested the hypothesis that type I IFN signaling directly impairs cDC function during Plasmodium infection in mice. Using cDC-specific IFNAR1-deficient mice, and mixed BM chimeras, we found that type I IFN signaling directly affects cDC function, limiting the ability of cDCs to prime IFN-γ–producing Th1 cells. Although type I IFN signaling modulated all subsets of splenic cDCs, CD8– cDCs were especially susceptible, exhibiting reduced phagocytic and Th1-promoting properties in response to type I IFNs. Additionally, rapid and systemic IFN-α production in response to Plasmodium infection required type I IFN signaling in cDCs themselves, revealing their contribution to a feed-forward cytokine-signaling loop. Together, these data suggest abrogation of type I IFN signaling in CD8– splenic cDCs as an approach for enhancing Th1 responses against Plasmodium and other type I IFN–inducing pathogens. NMRC (Natl Medical Research Council, S’pore) Published version

Contains fulltext : 138727.pdf (Publisher’s version ) (Open Access) In humans, infection with Coxiella burnetii, the causative agent of Q fever, leads to acute or chronic infection, both associated with specific clinical symptoms. In contrast, no symptoms are observed in goats during C. burnetii infection, although infection of the placenta eventually leads to premature delivery, stillbirth and abortion. It is unknown whether these differences in clinical outcome are due to the early immune responses of the goats. Therefore, peripheral blood mononuclear cells (PBMCs) were isolated from pregnant goats. In total, 17 goats were included in the study. Six goats remained naive, while eleven goats were infected with C. burnetii. Toll-like receptor (TLR) and cytokine mRNA expression were measured after in vitro stimulation with heat-killed C. burnetii at different time points (prior infection, day 7, 35 and 56 after infection). In naive goats an increased expression of interleukin (IL)-1beta, tumor necrosis factor (TNF)-alpha, IL-10 and interferon (IFN)-gamma mRNA upon C. burnetii stimulation was detected. In addition, TLR2 expression was strongly up-regulated. In goats infected with C. burnetii, PBMCs re-stimulated in vitro with C. burnetii, expressed significantly more TNF-alpha mRNA and IFN-gamma mRNA compared to naive goats. In contrast, IL-10 mRNA production capacity was down-regulated during C. burnetii infection. Interestingly, at day 7 after inoculation a decreased IFN-gamma protein level was observed in stimulated leukocytes in whole blood from infected goats, whereas at other time-points increased production of IFN-gamma protein was seen. Our study shows that goats initiate a robust pro-inflammatory immune response against C. burnetii in vitro. Furthermore, PBMCs from C. burnetii infected goats show augmented pro-inflammatory cytokine responses compared to PBMCs from non-infected goats. However, despite this pro-inflammatory response, goats are not capable of clearing the C. burnetii infection.

Contains fulltext : 137608.pdf (Publisher’s version ) (Closed access) Infection with Coxiella burnetii may lead to life-threatening chronic Q fever endocarditis or vascular infections, which are often difficult to diagnose. The present study aims to investigate whether measurement of in-vitro interferon-gamma (IFN-gamma) production, a key cytokine in the immune response against C. burnetii, differentiates chronic from a past cleared infection, and whether measurement of other cytokines would improve the discriminative power. First, C. burnetii-specific IFN-gamma production was measured in whole blood of 28 definite chronic Q fever patients and compared with 135 individuals with past Q fever (seropositive controls) and 908 seronegative controls. IFN-gamma production was significantly higher in chronic Q fever patients than in controls, but with overlapping values between patients and seropositives. Secondly, the production of a series of other cytokines was measured in a subset of patients and controls, which showed that interleukin (IL)-2 production was significantly lower in patients than in seropositive controls. Subsequently, measuring IL-2 in all patients and all controls with substantial IFN-gamma production showed that an IFN-gamma/IL-2 ratio >11 had a sensitivity and specificity of 79% and 96%, respectively, to diagnose chronic Q fever. This indicates that a high IFN-gamma/IL-2 ratio is highly suggestive for chronic Q fever. In an additional group of 25 individuals with persistent high anti-Coxiella phase I IgG titres without definite chronic infection, all but six showed an IFN-gamma/IL-2 ratio

Contains fulltext : 116678.pdf (Publisher’s version ) (Closed access) Background. Current practice for diagnosis of Q fever, caused by the intracellular pathogen Coxiella burnetii, relies mainly on serology and, in prevaccination assessment, on skin tests (STs), which both have drawbacks. In this study, C. burnetii-specific interferon gamma (IFN-gamma) production was used as a new diagnostic tool for previous Q fever, circumventing most of these drawbacks. Our aim was to compare this test to serology and ST. Methods. One thousand five hundred twenty-five individuals from an endemic area with a risk for chronic Q fever were enrolled. IFN-gamma production was measured after in vitro stimulation of whole blood with C. burnetii antigens. Various formats using different C. burnetii antigens were tested. Serology and ST were performed in all individuals. Results. In all assay formats, C. burnetii-specific IFN-gamma production was higher (P < .0001) in seropositive or ST-positive subjects than in seronegative and ST-negative subjects. Whole blood incubated for 24 hours with C. burnetii Nine Mile showed optimal performance. After excluding subjects with equivocal serology and/or borderline ST results, IFN-gamma production was 449 +/- 82 pg/mL in the positive individuals (n = 219) but only 21 +/- 3 pg/mL in negative subjects (n = 908). Using Bayesian analysis, sensitivity and specificity (87.0% and 90.2%, respectively) were similar to the combination of serology and ST (83.0% and 95.6%, respectively). Agreement with the combination of serology and ST was moderate (84% concordance; kappa = 0.542). Conclusions. Specific IFN-gamma detection is a novel diagnostic assay for previous C. burnetii infection and shows similar performance and practical advantages over serology and ST. Future studies to investigate the clinical value in practice are warranted.

SUMMARY The rapid spread of the Zika virus (ZIKV) in the Americas and its potential association with thousands of suspected cases of microcephaly in Brazil and higher rates of Guillain-Barré syndrome meet the conditions for a Public Health Emergency of International Concern, as stated by the World Health Organization in February 2016. Two months later, the Centers for Disease Control and Prevention (CDC) announced that the current available evidence supports the existence of a causal relationship between prenatal Zika virus infection and microcephaly and other serious brain anomalies. Microcephaly can be caused by several factors, and its clinical course and prognosis are difficult to predict. Other pathogens with proven teratogenicity have been identified long before the current ZIKV epidemic. Despite the growing number of cases with maternal signs of infection and/or presence of ZIKV in tissues of affected newborns or fetuses, it is currently difficult to assess the magnitude of increase of microcephaly prevalence in Brazil, as well as the role of other factors in the development of congenital neurological conditions. Meanwhile, health agencies and medical organizations have issued cautious guidelines advising health care practitioners and expectant couples traveling to, returning from, or living in affected areas. Analogous to dengue virus (DENV) epidemics, ZIKV has the potential to become endemic in all countries infested by Aedes mosquitoes, while new mutations could impact viral replication in humans, leading to increased virulence and consequently heightened chances of viral transmission to additional naive mosquito vectors. Studies are urgently needed to answer the questions surrounding ZIKV and its role in congenital neurological conditions.

During blood-stage Plasmodium infection, large-scale invasion of RBCs often occurs before the generation of cellular immune responses. In Plasmodium berghei ANKA (PbA)-infected C57BL/6 mice, CD4(+) T cells controlled parasite numbers poorly, instead providing early help to pathogenic CD8(+) T cells. Expression analysis revealed that the transcriptional signature of CD4(+) T cells from PbA-infected mice was dominated by type I IFN (IFN-I) and IFN-gamma-signalling pathway-related genes. A role for IFN-I during blood-stage Plasmodium infection had yet to be established. Here, we observed IFN-alpha protein production in the spleen of PbA-infected C57BL/6 mice over the first 2 days of infection. Mice deficient in IFN-I signalling had reduced parasite burdens, and displayed none of the fatal neurological symptoms associated with PbA infection. IFN-I substantially inhibited CD4(+) T-bet 1 T-cell-derived IFN-gamma production, and prevented this emerging Th1 response from controlling parasites. Experiments using BM chimeric mice revealed that IFN-I signalled predominantly via radio-sensitive, haematopoietic cells, but did not suppress CD4(+) T cells via direct signalling to this cell type. Finally, we found that IFN-I suppressed IFN-gamma production, and hampered efficient control of parasitaemia in mice infected with non-lethal Plasmodium chabaudi. Thus, we have elucidated a novel regulatory pathway in primary blood-stage Plasmodium infection that suppresses CD4(+) T-cell-mediated parasite control.