Publications by authors named "Eline Oerlemans"

Strategies against the opportunistic fungal pathogen Candida albicans based on probiotic microorganisms represent a promising alternative to traditional antifungals. Here, we investigated the effects of Lactobacillaceae isolates from fermented foods or the human vagina, alone or in combination with the probiotic yeast Saccharomyces cerevisiae CNCM I-3856, against C. albicans in vitro.

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  • Understanding the vaginal microbiome’s composition and function is vital for women's reproductive health, and the Isala citizen-science project analyzed samples from over 3,300 women in Belgium to explore this.
  • The study found that age, childbirth, and menstrual cycle phase significantly influenced the vaginal microbiome, with Lactobacillus species present in 78% of samples.
  • The research established connections between different bacterial groups and various health factors, like estrogen levels, contraceptive use, and lifestyle choices, creating a comprehensive resource for future clinical studies.
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The salivary microbiome has been proven to play a crucial role in local and systemic diseases. Moreover, the effects of biological and lifestyle factors such as oral hygiene and smoking on this microbial community have already been explored. However, what was not yet well understood was the natural variation of the saliva microbiome in healthy women and how this is associated with specific use of hormonal contraception and with the number of different sexual partners with whom microbiome exchange is expected regularly.

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  • Tailored skin microbiome modulation with probiotics, specifically lactobacilli, shows promise in treating acne while being traditionally undervalued in skin health.
  • Specific strains of nomadic lactobacilli are selected and microencapsulated for topical use, demonstrating effectiveness in reducing inflammation and lesions in patients with mild-to-moderate acne during a pilot study.
  • After 8 weeks of daily application, results indicate a lasting improvement in skin condition, including a decrease in harmful bacteria and a temporary shift in the skin microbiome, suggesting potential immunomodulatory benefits.
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  • The human skin microbiota plays a crucial role in defending against pathogens and regulating immune responses, with lactobacilli identified as beneficial inhabitants of healthy skin.
  • Inflammatory skin conditions are linked to an imbalanced skin microbiome, leading to research on lactobacilli-based probiotics for treatment via topical application.
  • Lactobacilli support skin health by competing with pathogens, reducing inflammation through their effects on the immune system, and strengthening the skin barrier, though further clinical studies are needed to deepen understanding and confirm efficacy.
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While bacterial vaginosis (BV) is a well-known type of vaginal dysbiosis, aerobic vaginitis (AV) is an inflammatory condition that remains understudied and under-recognised. It predisposes women to serious complications including urogenital infections and pregnancy problems. Here, we investigated the bacterial community in AV to explore its possible role in AV pathogenesis.

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  • * The study tested three specific strains of Lactobacillus in a vaginal gel on 20 women with acute VVC over four weeks, observing their microbiome through various scientific methods.
  • * Results showed that 45% of women treated with the probiotic gel did not need additional medication, and their fungal levels were comparable to those treated with fluconazole, suggesting probiotic lactobacilli may be effective without harming beneficial vaginal bacteria as azoles do.
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In vitro studies suggest that certain probiotic bacterial strains have potential activity against opportunistic infections such as Candida. There are few in vivo trials using probiotics as a single treatment for acute Candida vulvovaginitis (CV). In this open-label, proof-of-concept study, selected Lactobacillus strains were tested in women with acute Candida vaginitis.

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Lactobacilli have been evaluated as probiotics against Candida infections in several clinical trials, but with variable results. Predicting and understanding the clinical efficacy of Lactobacillus strains is hampered by an overall lack of insights into their modes of action. In this study, we aimed to unravel molecular mechanisms underlying the inhibitory effects of lactobacilli on hyphal morphogenesis, which is a crucial step in C.

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Bacterial endotoxins are a component of particulate matter (PM) with anticipated health implications, yet we know little about how host reception of endotoxin through toll-like receptor 4 (TLR4) is affected by its association with other PM components. Subsequently, we investigated the relationship between endotoxin concentration (recombinant Factor C (rFC) assay) and host recognition (HEK Blue-TLR4 NF-kB reporter cell line based assay) in various compositions of urban PM, including road traffic, industrial and urban green land use classes. While the assays did not correlate strongly between each other, the TLR4 reporter cell line was found to be better correlated to the IL-8 response of PM.

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  • - Spontaneous vegetable fermentations, specifically carrot juice, are becoming popular due to their flavor and potential health benefits, but their microbiological processes are not well understood, raising food safety concerns.
  • - A study analyzed samples from 38 carrot juice fermentations collected via citizen science, finding that lactic acid bacteria (LAB) dominated after just a few days and produced metabolites like lactic acid and cadaverine.
  • - Genetic analyses revealed a high diversity of LAB, revealing their roles in fermentation, but only certain strains maintained the fermentation dynamics, highlighting the carrot juice fermentation as a valuable system for studying LAB and their ecological interactions.
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To improve our understanding of upper respiratory tract (URT) diseases and the underlying microbial pathogenesis, a better characterization of the healthy URT microbiome is crucial. In this first large-scale study, we obtained more insight in the URT microbiome of healthy adults. Hereto, we collected paired nasal and nasopharyngeal swabs from 100 healthy participants in a citizen-science project.

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A number of clinical studies have shown protective effects of lactobacilli against Candida species in the gastrointestinal tract, the urogenital tract and the oral cavity, while others did not show clear effects. Evidence on the mode of action of lactobacilli against Candida is also still lacking. In this study, the anti-Candida activity of the model probiotic strain Lactobacillus rhamnosus GG was explored in different assays to determine molecular interactions.

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