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Vaginal microbiome

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https://www.readbyqxmd.com/read/29141044/high-dimensional-linear-state-space-models-for-dynamic-microbial-interaction-networks
#1
Iris Chen, Yogeshwar D Kelkar, Yu Gu, Jie Zhou, Xing Qiu, Hulin Wu
Medical researchers are increasingly interested in knowing how the complex community of micro-organisms living on human body impacts human health. Key to this is to understand how the microbes interact with each other. Time-course studies on human microbiome indicate that the composition of microbiome changes over short time periods, primarily as a consequence of synergistic and antagonistic interactions of the members of the microbiome with each other and with the environment. Knowledge of the abundance of bacteria-which are the predominant members of the human microbiome-in such time-course studies along with appropriate mathematical models will allow us to identify key dynamic interaction networks within the microbiome...
2017: PloS One
https://www.readbyqxmd.com/read/29124056/microbial-therapeutics-designed-for-infant-health
#2
REVIEW
Claire Watkins, Catherine Stanton, C Anthony Ryan, R Paul Ross
Acknowledgment of the gut microbiome as a vital asset to health has led to multiple studies attempting to elucidate its mechanisms of action. During the first year of life, many factors can cause fluctuation in the developing gut microbiome. Host genetics, maternal health status, mode of delivery, gestational age, feeding regime, and perinatal antibiotic usage, are known factors which can influence the development of the infant gut microbiome. Thus, the microbiome of vaginally born, exclusively breastfed infants at term, with no previous exposure to antibiotics, either directly or indirectly from the mother, is to be considered the "gold standard...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/29069100/gut-microbiome-of-mothers-delivering-prematurely-shows-reduced-diversity-and-lower-relative-abundance-of-bifidobacterium-and-streptococcus
#3
Cecilie Dahl, Maggie Stanislawski, Nina Iszatt, Siddhartha Mandal, Catherine Lozupone, Jose C Clemente, Rob Knight, Hein Stigum, Merete Eggesbø
OBJECTIVE: Preterm birth is the main reason for neonatal deaths worldwide. We investigate whether maternal gut microbiota may play a previously overlooked role. METHODS: The Norwegian Microbiota Study (NoMIC) is a case control study on preterm birth (<259 days of gestation, calculated primarily based on the last menstrual period), including two consecutively born term infants per infant born prematurely. Eligible mothers were fluent in Norwegian and recruited from the maternity ward at a county hospital in Eastern Norway in the period 2002-2005...
2017: PloS One
https://www.readbyqxmd.com/read/29059077/the-microbiome-and-hiv-prevention-strategies-in-women
#4
Salim S Abdool Karim, Jo-Ann S Passmore, Cheryl Baxter
PURPOSE OF REVIEW: HIV prevention approaches that women can use and control are a priority. Results from topical and oral preexposure prophylaxis (PrEP) HIV prevention trials have produced inconsistent results in women. One of the main behavioural factors impacting effectiveness of PrEP has been suboptimal adherence. In this review, we examine biological factors that modulate topical PrEP efficacy, with particular focus on the vaginal microbiome. RECENT FINDINGS: Genital inflammation is an independent risk factor for HIV acquisition in women...
October 20, 2017: Current Opinion in HIV and AIDS
https://www.readbyqxmd.com/read/29057083/low-level-genital-hiv-shedding-in-thai-hiv-infected-women-with-suppressed-plasma-viral-load-after-menopause-a-longitudinal-study
#5
EDITORIAL
Nadia Kancheva Landolt, Tanya Do, Naruporn Kasipong, Rosalin Kriengsinyot, Sasiwimol Ubolyam, Apicha Mahanontharit, Tippawan Pankam, Tanakorn Apornpong, Anchalee Avihingsanon, Jintanat Ananworanich, Nittaya Phanuphak, Surasith Chaithongwongwatthana
OBJECTIVES: First, to evaluate the longitudinal changes of HIV RNA in genital secretions in HIV-positive women with plasma HIV RNA <50 copies/mL before and after the onset of menopause. Second, to assess inflammatory markers and prevalence of comorbidities after the onset of menopause. METHODS: This was a prospective observational study with two time points. HIV RNA in genital secretions (GVL) was measured in 15 HIV-positive menopausal women (second time point)...
October 1, 2017: Journal of Virus Eradication
https://www.readbyqxmd.com/read/29043070/bacterial%C3%A2-vaginosis
#6
REVIEW
Phillip Hay
Bacterial vaginosis is the most prevalent cause of abnormal vaginal discharge in women of childbearing age. It can have a major impact on quality of life and psychological wellbeing if frequently recurrent and strongly symptomatic. The use of molecular techniques to study the vaginal microbiome is increasing our understanding of the dynamic changes in flora that occur in health and disease. It might soon be possible to separate Gardnerella into different pathogenic and non-pathogenic species. Many groups are studying compounds that can disrupt the biofilm which is dominated by Gardnerella and Atopobium vaginae...
2017: F1000Research
https://www.readbyqxmd.com/read/29042534/the-microbiota-continuum-along-the-female-reproductive-tract-and-its-relation-to-uterine-related-diseases
#7
Chen Chen, Xiaolei Song, Weixia Wei, Huanzi Zhong, Juanjuan Dai, Zhou Lan, Fei Li, Xinlei Yu, Qiang Feng, Zirong Wang, Hailiang Xie, Xiaomin Chen, Chunwei Zeng, Bo Wen, Liping Zeng, Hui Du, Huiru Tang, Changlu Xu, Yan Xia, Huihua Xia, Huanming Yang, Jian Wang, Jun Wang, Lise Madsen, Susanne Brix, Karsten Kristiansen, Xun Xu, Junhua Li, Ruifang Wu, Huijue Jia
Reports on bacteria detected in maternal fluids during pregnancy are typically associated with adverse consequences, and whether the female reproductive tract harbours distinct microbial communities beyond the vagina has been a matter of debate. Here we systematically sample the microbiota within the female reproductive tract in 110 women of reproductive age, and examine the nature of colonisation by 16S rRNA gene amplicon sequencing and cultivation. We find distinct microbial communities in cervical canal, uterus, fallopian tubes and peritoneal fluid, differing from that of the vagina...
October 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/29038470/trios-promising-in-silico-biomarkers-for-differentiating-the-effect-of-disease-on-the-human-microbiome-network
#8
Zhanshan Sam Ma, Dandan Ye
Recent advances in the HMP (human microbiome project) research have revealed profound implications of the human microbiome to our health and diseases. We postulated that there should be distinctive features associated with healthy and/or diseased microbiome networks. Following Occam's razor principle, we further hypothesized that triangle motifs or trios, arguably the simplest motif in a complex network of the human microbiome, should be sufficient to detect changes that occurred in the diseased microbiome...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29038128/microbial-composition-predicts-genital-tract-inflammation-and-persistent-bacterial-vaginosis-in-adolescent-south-african-women
#9
Katie Lennard, Smritee Dabee, Shaun L Barnabas, Enock Havyarimana, Anna Blakney, Shameem Z Jaumdally, Gerrit Botha, Nonhlanhla N Mkhize, Linda-Gail Bekker, David A Lewis, Glenda Gray, Nicola Mulder, Jo-Ann S Passmore, Heather B Jaspan
Young African females are at increased risk of HIV acquisition, and genital inflammation or the vaginal microbiome may contribute to this risk. We studied these factors in 168 HIV negative South African adolescent women aged 16-22 years. Unsupervised clustering of 16S rRNA gene sequences revealed three clusters (subtypes), one of which was strongly associated with genital inflammation. In a multivariate model, microbiome compositional subtype and hormonal contraception were significantly associated with genital inflammation...
October 16, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29029138/the-female-genital-tract-microbiome-is-associated-with-vaginal-antiretroviral-drug-concentrations-in-human-immunodeficiency-virus-infected-women-on-antiretroviral-therapy
#10
Renee Donahue Carlson, Anandi N Sheth, Timothy D Read, Michael B Frisch, C Christina Mehta, Amy Martin, Richard E Haaland, Anar S Patel, Chou-Pong Pau, Colleen S Kraft, Igho Ofotokun
Background: The female genital tract (FGT) microbiome may affect vaginal pH and other factors that influence drug movement into the vagina. We examined the relationship between the microbiome and antiretroviral concentrations in the FGT. Methods: Over one menstrual cycle, 20 human immunodeficiency virus (HIV)-infected women virologically suppressed on tenofovir (TFV) disoproxil fumarate/emtricitabine and ritonavir-boosted atazanavir (ATV) underwent serial paired cervicovaginal and plasma sampling for antiretroviral concentrations using high-performance liquid chromatography-tandem mass spectrometry...
October 5, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29026883/increased-weight-gain-by-c-section-functional-significance-of-the-primordial-microbiome
#11
Keith A Martinez, Joseph C Devlin, Corey R Lacher, Yue Yin, Yi Cai, Jincheng Wang, Maria G Dominguez-Bello
Epidemiological evidence supports a direct association between early microbiota impact-including C-section-and obesity. We performed antibiotic-free, fostered C-sections and determined the impact on the early microbiota and body weight during development. Mice in the C-section group gained more body mass after weaning, with a stronger phenotype in females. C-section-born mice lacked the dynamic developmental gut microbiota changes observed in control mice. The results demonstrate a causal relationship between C-section and increased body weight, supporting the involvement of maternal vaginal bacteria in normal metabolic development...
October 2017: Science Advances
https://www.readbyqxmd.com/read/28993762/commentary-lactobacilli-dominance-and-vaginal-ph-why-is-the-human-vaginal-microbiome-unique
#12
COMMENT
Virginia Fuochi, Giovanni Li Volti, Pio Maria Furneri
No abstract text is available yet for this article.
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28969122/comparative-study-on-the-vaginal-flora-and-incidence-of-asymptomatic-vaginosis-among-healthy-women-and-in-women-with-infertility-problems-of-reproductive-age
#13
Geethavani Babu, Balamuru Ganvelu Singaravelu, R Srikumar, Sreenivasalu V Reddy, Afraa Kokan
INTRODUCTION: The normal vaginal flora is highly complex, dominated by lactobacilli of doderlein that plays a vital role in maintaining the women's health and inhibits other pathogenic microorganisms. Fluctuation in local environment or exposure to any exogenous and endogenous sources changes the vaginal flora over a period of time. Disruption of the vaginal ecosystem changes the microflora of the healthy vagina, altering the pH and predisposing to lower reproductive tract infections...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28915448/the-composition-of-the-vaginal-microbiome-in-first-trimester-pregnant-women-influences-the-level-of-autophagy-and-stress-in-vaginal-epithelial-cells
#14
Dimitrios Nasioudis, Larry J Forney, G Maria Schneider, Karol Gliniewicz, Michael T France, Allison Boester, Mio Sawai, Jessica Scholl, Steven S Witkin
Epithelial cells lining the vagina are major components of genital tract immunity. The influence of the vaginal microbiome on properties of host epithelial cells is largely unexplored. We evaluated whether differences in the most abundant lactobacilli species or bacterial genera in the vagina of first trimester pregnant women were associated with variations in the extent of stress and autophagy in vaginal epithelial cells. Vaginal swabs from 154 first trimester pregnant women were analyzed for bacterial composition by amplification and sequencing of the V1-V3 region of bacterial 16S rRNA genes...
September 2017: Journal of Reproductive Immunology
https://www.readbyqxmd.com/read/28893284/role-of-sex-hormones-and-the-vaginal-microbiome-in-susceptibility-and-mucosal-immunity-to-hiv-1-in-the-female-genital-tract
#15
REVIEW
Danielle Vitali, Jocelyn M Wessels, Charu Kaushic
While the prevalence of Human immunodeficiency virus-1 (HIV-1) infection has stabilized globally, it continues to be the leading cause of death among women of reproductive age. The majority of new infections are transmitted heterosexually, and women have consistently been found to be more susceptible to HIV-1 infection during heterosexual intercourse compared to men. This emphasizes the need for a deeper understanding of how the microenvironment in the female genital tract (FGT) could influence HIV-1 acquisition...
September 12, 2017: AIDS Research and Therapy
https://www.readbyqxmd.com/read/28878691/spontaneous-preterm-birth-is-associated-with-differential-expression-of-vaginal-metabolites-by-lactobacilli-dominated-microflora
#16
Graham P Stafford, Jennifer L Parker, Emmanuel Amabebe, James Kistler, Steven Reynolds, Victoria Stern, Martyn Paley, Dilly O C Anumba
A major challenge in preventing preterm birth (PTB) is identifying women at greatest risk. This pilot study prospectively examined the differences in vaginal microbiota and metabolite profiles of women who delivered prematurely compared to their term counterparts in a cohort of asymptomatic (studied at 20-22, n = 80; and 26-28 weeks, n = 41) and symptomatic women (studied at 24-36 weeks, n = 37). Using 16S rRNA sequencing, the vaginal microbiota from cervicovaginal fluid samples was characterized into five Community State Types (CST) dominated by Lactobacillus spp...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28877893/randomized-controlled-trial-on-the-impact-of-early-life-intervention-with-bifidobacteria-on-the-healthy-infant-fecal-microbiota-and-metabolome
#17
Monika Bazanella, Tanja V Maier, Thomas Clavel, Ilias Lagkouvardos, Marianna Lucio, Maria X Maldonado-Gòmez, Chloe Autran, Jens Walter, Lars Bode, Philippe Schmitt-Kopplin, Dirk Haller
Background: Early-life colonization of the intestinal tract is a dynamic process influenced by numerous factors. The impact of probiotic-supplemented infant formula on the composition and function of the infant gut microbiota is not well defined.Objective: We sought to determine the effects of a bifidobacteria-containing formula on the healthy human intestinal microbiome during the first year of life.Design: A double-blind, randomized, placebo-controlled study of newborn infants assigned to a standard whey-based formula containing a total of 10(8) colony-forming units (CFU)/g of Bifidobacterium bifidum, Bifidobacterium breve, Bifidobacterium longum, B...
September 6, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28860491/influence-of-pregnancy-history-on-the-vaginal-microbiome-of-pregnant-women-in-their-first-trimester
#18
Dimitrios Nasioudis, Larry J Forney, G Maria Schneider, Karol Gliniewicz, Michael France, Allison Boester, Mio Sawai, Jessica Scholl, Steven S Witkin
Pregnancy permanently alters maternal anatomy, physiology and immunity. We evaluated if the vaginal microbiome differed between women with a first or subsequent conception. Relative abundance of bacteria in the vaginal microbiome in first trimester pregnant women, 52 with their first known conception, 26 with a prior spontaneous or induced abortion but no deliveries and 77 with at least one prior birth, was determined by classifying DNA sequences from the V1-V3 region of bacterial 16 S rRNA genes. Lactobacillus crispatus was the numerically most abundant bacterium in 76...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28846702/association-between-statin-use-the-vaginal-microbiome-and-gardnerella-vaginalis-vaginolysin-mediated-cytotoxicity
#19
Abdallah A Abdelmaksoud, Philippe H Girerd, Erin M Garcia, J Paul Brooks, Lauren M Leftwich, Nihar U Sheth, Steven P Bradley, Myrna G Serrano, Jennifer M Fettweis, Bernice Huang, Jerome F Strauss, Gregory A Buck, Kimberly K Jefferson
BACKGROUND: Bacterial vaginosis (BV) is the leading dysbiosis of the vaginal microbiome. The pathways leading towards the development of BV are not well understood. Gardnerella vaginalis is frequently associated with BV. G. vaginalis produces the cholesterol-dependent cytolysin (CDC), vaginolysin, which can lyse a variety of human cells and is thought to play a role in pathogenesis. Because membrane cholesterol is required for vaginolysin to function, and because HMG-CoA reductase inhibitors (statins) affect not only serum levels of cholesterol but membrane levels as well, we hypothesized that statins might affect the vaginal microbiome...
2017: PloS One
https://www.readbyqxmd.com/read/28844447/women-and-their-microbes-the-unexpected-friendship
#20
REVIEW
Jessica A Younes, Elke Lievens, Ruben Hummelen, Rebecca van der Westen, Gregor Reid, Mariya I Petrova
Communities of microbiota have been associated with numerous health outcomes, and while much emphasis has been placed on the gastrointestinal niche, there is growing interest in the microbiome specific for female reproductive health and the health of their offspring. The vaginal microbiome plays an essential role not only in health and dysbiosis, but also potentially in successful fertilization and healthy pregnancies. In addition, microbial communities have been isolated from formerly forbidden sterile niches such as the placenta, breast, uterus, and Fallopian tubes, strongly suggesting an additional microbial role in women's health...
August 22, 2017: Trends in Microbiology
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