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Vaginal microbiota

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https://www.readbyqxmd.com/read/28527759/selection-of-new-lactic-acid-bacteria-strains-bearing-probiotic-features-from-mucosal-microbiota-of-healthy-calves-looking-for-immunobiotics-through-in-vitro-and-in-vivo-approaches-for-immunoprophylaxis-applications
#1
Sávio Sandes, Luige Alvim, Bruno Silva, Leonardo Acurcio, Cinara Santos, Márcia Campos, Camila Santos, Jacques Nicoli, Elisabeth Neumann, Álvaro Nunes
From the birth, since their mucosal microbiota and immune system are not fully developed, newborn calves are susceptible to several mucosal pathogenic microorganisms. Operating through humoral and non-humoral mechanisms in the host, several lactic acid bacteria strains bearing probiotic features are often employed in livestock as food supplement, improving animal production performance, promoting health and reducing the severity of mucosal infections. Accordingly, we isolated, species-level identified and screened for their probiotic potentials seventy lactic acid bacteria strains from upper airway, vaginal and intestinal mucosa of healthy calves...
July 2017: Microbiological Research
https://www.readbyqxmd.com/read/28508168/distinct-histone-modifications-modulate-defb1-expression-in-human-vaginal-keratinocytes-in-response-to-lactobacillus-spp
#2
Jaehyouk Lee, Ara Jang, Jin Wook Kim, Jun Hyun Han, Byung Hee Chun, Hye Su Jung, Che Ok Jeon, Soon Chul Myung
Vaginal commensal lactobacilli are considered to contribute significantly to the control of vaginal microbiota by competing with other microflora for adherence to the vaginal epithelium and by producing antimicrobial compounds. However, the molecular mechanisms of symbiotic prokaryotic-eukaryotic communication in the vaginal ecosystem remain poorly understood. Here, we showed that both DNA methylation and histone modifications were associated with expression of the DEFB1 gene, which encodes the antimicrobial peptide human β-defensin-1, in vaginal keratinocyte VK2/E6E7 cells...
May 15, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28504576/is-the-role-of-human-female-reproductive-tract-microbiota-underestimated
#3
D Kamińska, M Gajecka
An issue that is currently undergoing extensive study is the influence of human vaginal microbiota (VMB) on the health status of women and their neonates. Healthy women are mainly colonised with lactobacilli such as Lactobacillus crispatus, Lactobacillus jensenii, and Lactobacillus iners; however, other bacteria may be elements of the VMB, particularly in women with bacterial vaginosis. The implementation of culture-independent molecular methods in VMB characterisation, especially next-generation sequencing, have provided new information regarding bacterial diversity in the vagina, revealing a large number of novel, fastidious, and/or uncultivated bacterial species...
May 15, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/28504574/gut-dysbiosis-following-c-section-instigates-higher-colonisation-of-toxigenic-clostridium-perfringens-in-infants
#4
R Nagpal, H Tsuji, T Takahashi, K Nomoto, K Kawashima, S Nagata, Y Yamashiro
Herein we investigated the intestinal carriage of α-toxigenic and enterotoxigenic Clostridium perfringens during infancy, focusing on its association with other gut microbes and mode of delivery and feeding. Faecal samples from 89 healthy term infants were collected at age 7 days, 1 month, 3 months, 6 months and 3 years. C. perfringens was quantified by qPCR; other gut bacteria were quantified by reverse-transcription-qPCR. Alpha-toxigenic C. perfringens was detected in 3.4% infants at day 7 but was present in 35-40% infants at subsequent time-points, with counts ranging from 10(3)-10(7) cells/g faeces...
May 15, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/28480290/group-b-streptococci-colonization-in-pregnant-guatemalan-women-prevalence-risk-factors-and-vaginal-microbiome
#5
Anne-Marie Rick, Angie Aguilar, Rosita Cortes, Remei Gordillo, Mario Melgar, Gabriela Samayoa-Reyes, Daniel N Frank, Edwin J Asturias
BACKGROUND: Infection causes 1 of every 5 neonatal deaths globally. Group B Streptococcus (GBS) is the most significant pathogen, although little is known about its epidemiology and risk in low-income countries. METHODS: A cross-sectional study in 2015 at a public hospital in Guatemala City enrolled women ≥35 weeks' gestation. Vaginal and rectal swabs were processed using Lim broth and GBS CHROMagar then agglutination testing. Risk factors were assessed using multivariate analysis...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28479120/what-fertility-specialists-should-know-about-the-vaginal-microbiome-a-review
#6
REVIEW
Juan Antonio García-Velasco, Marco Menabrito, Isidoro Bruna Catalán
Our understanding of the composition of the microbial communities that inhabit the human body, known as the 'microbiome', is aided by the development of non-culture-dependent DNA sequencing. It is increasingly apparent that the balance of microbial species greatly affects the health of the host. Disturbances in the composition of bacterial communities have been shown to contribute to various disease states, and there is a growing body of evidence that the vaginal microbiota, which is unique to each woman, plays an important role in determining many facets of reproductive health...
April 19, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28472225/recent-bacterial-vaginosis-is-associated-with-acquisition-of-mycoplasma-genitalium
#7
Erica M Lokken, Jennifer E Balkus, James Kiarie, James P Hughes, Walter Jaoko, Patricia A Totten, R Scott McClelland, Lisa E Manhart
We assessed the association between recent bacterial vaginosis (BV) and incident Mycoplasma genitalium, a sexually transmitted bacterium associated with adverse female reproductive health outcomes. Female sex workers in Mombasa, Kenya completed a monthly sexual behavior interview and clinical examination. During February 2005-February 2006, vaginal fluid specimens collected from women every other month were tested for M. genitalium by nucleic acid amplification testing. Vaginal microbiota was assessed monthly and categorized by Nugent score (0-3 normal, 4-6 intermediate microbiota, 7-10 BV)...
May 3, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28471912/effect-of-synbiotic-on-the-gut-microbiota-of-caesarean-delivered-infants-a-randomized-double-blind-multicenter-study
#8
Mei Chien Chua, Kaouther Ben-Amor, Christophe Lay, Anne Goh Eng Neo, Wen Chin Chiang, Rajeshwar Rao, Charmaine Chew, Surasith Chaithongwongwatthana, Nipon Khemapech, Jan Knol, Voranush Chongsrisawat
We determined the effect of short-chain galacto-oligosaccharides (scGOS), long-chain fructo-oligosaccharides (lcFOS) and Bifidobacterium breve M-16 V on the gut microbiota of caesarean born infants. Infants were randomized to receive a standard formula (control), the same with scGOS/lcFOS and B. breve M-16 V (synbiotic), or with scGOS/lcFOS (prebiotic) from birth until week 16, 30 subjects born vaginally were included as a reference group. Synbiotic supplementation resulted in a higher bifidobacteria proportion from day 3/5 (p < 0...
May 3, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28464600/-the-composition-of-gut-microbiota-in-infant-and-its-influencing-factors
#9
W Liu, J Q Feng, A Q Fan, M J Zhang, Y L Zhou, T Liu, Y J Xu
Gut microbiota provide enzymes and additional biochemical metabolic pathways for the host, which together with the host genome and the external environment, influence the body function. The composition of gut microbiota in infant is closely related to health in later life. However, it is influenced by many factors, including delivery mode, feeding pattern, prenatal diet, pregnancy psychology and antepartum antibiotic treatment. Vaginal delivery and breastfeeding is beneficial for shaping gut microbiota, while cesarean section and formula feeding would reduce the amount of gut dominant bacteria...
May 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28435139/the-role-of-lactic-acid-production-by-probiotic-lactobacillus-species-in-vaginal-health
#10
Gilda Tachedjian, Muriel Aldunate, Catronia S Bradshaw, Richard A Cone
Vaginal eubiosis is characterised by beneficial lactobacillus-dominated microbiota. In contrast, vaginal dysbiosis (e.g. bacterial vaginosis, BV), characterised by an overgrowth of multiple anaerobes, is associated with an increased risk of adverse urogenital and reproductive health outcomes. A major distinguishing feature between the vaginal environment in states of eubiosis and dysbiosis is a high concentration of lactic acid, produced by lactobacilli, that acidifies the vagina in eubiosis versus a sharp drop in lactic acid and an increase in pH in dysbiosis...
April 20, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28430679/cervicovaginal-levels-of-human-%C3%AE-defensin-1-2-3-and-4-of-reproductive-aged-women-with-chlamydia-trachomatis-infection
#11
Nathália Mayumi Noda-Nicolau, Larissa Brito Bastos, Aline Nascimento Bolpetti, Gabriel Vitor Silva Pinto, Larissa Doddi Marcolino, Camila Marconi, Carolina Sanitá Tafner Ferreira, Jossimara Polettini, Eliane Passarelli Vieira, Márcia Guimarães da Silva
OBJECTIVE: This study included women attending primary health care units in Botucatu, São Paulo, Brazil, to assess the cervicovaginal levels of human β-defensin (hBD) 1, 2, 3, and 4 during Chlamydia trachomatis infection. PATIENTS AND METHODS: Cervicovaginal samples were collected for Pap testing and assessing the presence of infection by C. trachomatis, human papillomavirus, Neisseria gonorrhoeae, and Trichomonas vaginalis. Vaginal smears were taken to evaluate local microbiota...
April 21, 2017: Journal of Lower Genital Tract Disease
https://www.readbyqxmd.com/read/28426023/infection-brief-encounter-uti-triggered-by-vaginal-microbiota
#12
Louise Stone
No abstract text is available yet for this article.
April 20, 2017: Nature Reviews. Urology
https://www.readbyqxmd.com/read/28418713/defence-factors-of-vaginal-lactobacilli
#13
S Kovachev
Accurate knowledge of the composition and ecology of the vaginal microbial environment in healthy women is necessary for understanding lactobacilli-dominated normal microbiota and the mechanisms by which it reduces disease risk. The vagina and its microbiota form a balanced ecosystem; any movement outside the normal range for this ecosystem of obligate and/or facultative microbes, termed dysbacteriosis, can lead to infection and disease. This review summarizes recent research on the vaginal ecosystem, the Lactobacillus species that dominate it, and the means by which they suppress the growth, development, and/or proliferation of pathogenic microbial species...
April 18, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28416607/human-milk-oligosaccharides-inhibit-growth-of-group-b-streptococcus
#14
Ann E Lin, Chloe A Autran, Alexandra Szyszka, Tamara Escajadillo, Mia Huang, Kamil Godula, Anthony R Prudden, Geert-Jan Boons, Amanda L Lewis, Kelly S Doran, Victor Nizet, Lars Bode
Streptococcus agalactiae (group B Streptococcus; GBS) is a leading cause of invasive bacterial infections in newborns, typically acquired vertically during childbirth secondary to maternal vaginal colonization. Human milk oligosaccharides (HMOs) have important nutritional and biological activities that guide development of the infant's immune system and shape the composition of normal gut microbiota. In this manner, HMOs help protect against pathogen colonization and reduce risk of infection. In the course of our studies of HMO-microbial interactions, we unexpectedly uncovered a novel HMO property to directly inhibit the growth of GBS, independent of host immunity...
April 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28401934/vaginal-lactic-acid-elicits-an-anti-inflammatory-response-from-human-cervicovaginal-epithelial-cells-and-inhibits-production-of-pro-inflammatory-mediators-associated-with-hiv-acquisition
#15
A C Hearps, D Tyssen, D Srbinovski, L Bayigga, D J D Diaz, M Aldunate, R A Cone, R Gugasyan, D J Anderson, G Tachedjian
Inflammation in the female reproductive tract (FRT) is associated with increased HIV transmission. Lactobacillus spp. dominate the vaginal microbiota of many women and their presence is associated with reduced HIV acquisition. Here we demonstrate that lactic acid (LA), a major organic acid metabolite produced by lactobacilli, mediates anti-inflammatory effects on human cervicovaginal epithelial cells. Treatment of human vaginal and cervical epithelial cell lines with LA (pH 3.9) elicited significant increases in the production of the anti-inflammatory cytokine IL-1RA...
April 12, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28398069/comparison-of-mucosal-markers-of-hiv-susceptibility-in-healthy-premenopausal-versus-postmenopausal-women
#16
Andrea Ries Thurman, Nazita Yousefieh, Neelima Chandra, Thomas Dudley Kimble, Susana Asin, Christiane Rollenhagen, Sharon Anderson, Betsy Herold, Jamie L Freiermuth, Brian S Starkman, Pedro Mesquita, Nicola Richardson-Harman, Tina Duong Cunningham, Sharon L Hillier, Lorna Rabe, Jill L Schwartz, Gustavo Doncel
OBJECTIVE: The objective of this study was to characterize cervicovaginal (CV) mucosal factors modulating susceptibility to HIV acquisition in healthy premenopausal (PRE) and postmenopausal (POST) women before and after treatment with estradiol. METHODS: We compared CV mucosal epithelial histology and immune cells, vaginal microbiota, antimicrobial activity of, and soluble mucosal protein concentrations in the CV fluid lavage (CVL), and p24 antigen production after ex vivo infection of ectocervical tissues with HIV-1BaL among PRE women (n = 20) in the follicular and luteal phases of the menstrual cycle and POST women (n = 17) at baseline and after approximately 1 month of treatment with 0...
April 11, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28388469/higher-prevalence-of-colonization-with-gardnerella-vaginalis-and-gram-negative-anaerobes-in-patients-with-recurrent-miscarriage-and-elevated-peripheral-natural-killer-cells
#17
R J Kuon, R Togawa, K Vomstein, M Weber, T Goeggl, T Strowitzki, U R Markert, S Zimmermann, V Daniel, A H Dalpke, B Toth
The role of vaginal infections in recurrent miscarriage (RM) is discussed controversially and screening is not recommended in international guidelines. Peripheral and uterine NK cells (pNK, uNK) play an important role in the establishment of a healthy pregnancy and are targets of immune diagnostics in RM patients. The aim of this study was to analyze the composition of the vaginal microbiota in RM patients and to correlate the findings to clinical characteristics as well as NK cell parameters. In total, n=243 RM patients with ≥3 consecutive miscarriages were recruited between 11/2011 and 03/2016...
March 30, 2017: Journal of Reproductive Immunology
https://www.readbyqxmd.com/read/28381231/exposure-to-household-furry-pets-influences-the-gut-microbiota-of-infant-at-3-4%C3%A2-months-following-various-birth-scenarios
#18
Hein M Tun, Theodore Konya, Tim K Takaro, Jeffrey R Brook, Radha Chari, Catherine J Field, David S Guttman, Allan B Becker, Piush J Mandhane, Stuart E Turvey, Padmaja Subbarao, Malcolm R Sears, James A Scott, Anita L Kozyrskyj
BACKGROUND: Early-life exposure to household pets has the capacity to reduce risk for overweight and allergic disease, especially following caesarean delivery. Since there is some evidence that pets also alter the gut microbial composition of infants, changes to the gut microbiome are putative pathways by which pet exposure can reduce these risks to health. To investigate the impact of pre- and postnatal pet exposure on infant gut microbiota following various birth scenarios, this study employed a large subsample of 746 infants from the Canadian Healthy Infant Longitudinal Development Study (CHILD) cohort, whose mothers were enrolled during pregnancy between 2009 and 2012...
April 6, 2017: Microbiome
https://www.readbyqxmd.com/read/28374172/evaluation-of-potential-probiotics-isolated-from-human-milk-and-colostrum
#19
Quésia S Damaceno, Jaqueline P Souza, Jacques R Nicoli, Raquel L Paula, Gabriela B Assis, Henrique C Figueiredo, Vasco Azevedo, Flaviano S Martins
Several studies have demonstrated a diversity of bacterial species in human milk, even in aseptically collected samples. The present study evaluated potential probiotic bacteria isolated from human milk and associated maternal variables. Milk samples were collected from 47 healthy women and cultured on selective and universal agar media under aerobic and anaerobic conditions. Bacterial isolates were counted and identified by Biotyper Matrix-Assisted Laser Desorption Ionization-Time of Flight mass spectrometry and then tested for probiotic properties...
April 3, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28358889/transient-microbiota-exposures-activate-dormant-escherichia-coli-infection-in-the-bladder-and-drive-severe-outcomes-of-recurrent-disease
#20
Nicole M Gilbert, Valerie P O'Brien, Amanda L Lewis
Pathogens often inhabit the body asymptomatically, emerging to cause disease in response to unknown triggers. In the bladder, latent intracellular Escherichia coli reservoirs are regarded as likely origins of recurrent urinary tract infection (rUTI), a problem affecting millions of women worldwide. However, clinically plausible triggers that activate these reservoirs are unknown. Clinical studies suggest that the composition of a woman's vaginal microbiota influences her susceptibility to rUTI, but the mechanisms behind these associations are unclear...
March 2017: PLoS Pathogens
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