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The Role of the Vaginal Microbiome in Women’s Health and Disease

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Microbiology".

Deadline for manuscript submissions: 20 January 2025 | Viewed by 7569

Special Issue Editors


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Guest Editor
Department of Interdisciplinary Medicine, School of Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
Interests: virus; bacteria; human infections

E-Mail Website
Guest Editor
Department of Interdisciplinary Medicine, Section of Microbiology and Virology, School of Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy
Interests: immunology; regenerative medicine; microbiology; virology
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Special Issue Information

Dear Colleagues,

Chlamydia trachomatis and human papillomavirus (HPV), the most common pathogens of sexually transmitted infections (STIs), increase the risk of both cervical cancer (CC) and infertility. HPV is extremely common worldwide; scientists distinguish between low-risk and high-risk genotypes, and transmission can take place via simple contact in the genital area. A total of 50 to 80% of sexually active individuals become infected with both C trachomatis and HPV viruses during their lifetime and up to 50% become infected with an HPV oncogenic genotype. The natural history of co-infection is strongly conditioned by the balance between the host microbiome and immune condition and the infecting agent. Though the infection often regresses, it tends to persist asymptomatically throughout adult life. The partnership between HPV and the C trachomatis occurs due to their similarities; they share common transmission routes, reciprocal advantages and the same risk factors. C trachomatis, as a Gram-negative bacterium, similarly to HPV, is an intracellular bacterium showing a unique biphasic development which helps it to steadily progress into the host throughout their life. Indeed, depending on the host’s immune condition, C trachomatis infection tends to migrate towards the upper genital tract and spreads to the uterus and fallopian tubes, opening the door for HPV invasion. In addition, most HPV and C trachomatis infections of the female genital tract are facilitated by the decay of the first line of defense in the vaginal environment constituted by a healthy vaginal microbiome characterized by a net equilibrium of all its components.

Medical microbiology, a large subset of microbiology that is applied to medicine, is a branch of medical science concerned with the prevention, diagnosis and treatment of infectious diseases, cancer and degenerative diseases. In addition, this field of science studies various clinical applications of microbes for improved health by enhancing immune responses at all levels. Thus, the aim of this Special Issue is to highlight the complexity and fragility of the vaginal microenvironment, accentuating the fundamental role of all elements and systems involved, including the Lactobacillus strains (Lactobacillus gasseri, Lactobacillus jensenii, Lactobacillus crispatus) and the role of the immune-endocrine system in preserving it from oncogenic mutation. Therefore, age, diet, genetic predisposition and condition of the immune system all impact the frequency and severity of disease, potentially resulting in precancerous and cancerous cervical lesions.

Prof. Dr. Raffaele Del Prete
Dr. Ciro Gargiulo Isacco
Guest Editors

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Keywords

  • vaginal microbiota
  • vaginal dysbiosis and immune complications
  • effect of epigenetic on the vaginal microbiome
  • immunity factors in vaginal microbiota
  • probiotics and the vaginal microbiome
  • vaginal dysbiosis and possible treatment with vaginal microbiome transplantation
  • the use of bio-identical sex-hormones for vaginal health

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Published Papers (3 papers)

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Research

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11 pages, 3227 KiB  
Article
Vaginal Lactobacilli Supernatants Protect from Herpes Simplex Virus Type 1 Infection in Cell Culture Models
by Elisa Avitabile, Laura Menotti, Barbara Giordani, Vanessa Croatti, Carola Parolin and Beatrice Vitali
Int. J. Mol. Sci. 2024, 25(5), 2492; https://doi.org/10.3390/ijms25052492 - 20 Feb 2024
Cited by 1 | Viewed by 1623
Abstract
A healthy vaginal microbiota hosts Lactobacillus as the most predominant genus. Lactobacilli play a role in human health through the production of diverse antimicrobial substances that can act against human pathogens or modulate the immune system. Previous reports highlighted the ability of vaginal [...] Read more.
A healthy vaginal microbiota hosts Lactobacillus as the most predominant genus. Lactobacilli play a role in human health through the production of diverse antimicrobial substances that can act against human pathogens or modulate the immune system. Previous reports highlighted the ability of vaginal lactobacilli to counteract viruses causing STIs, e.g., HIV-1 and HSV-2. In this report, we analyze the activity of supernatants of vaginal lactobacilli against HSV-1 infection, which is becoming increasingly relevant as a STI. We show that the supernatants of two vaginal Lactobacillus species (i.e., L. crispatus and L. gasseri) were active at neutralizing HSV-1 infection in two different cell lines of human and simian origin. Specifically, we demonstrate that L. crispatus strains are the most effective in antiviral activity, as evidenced by the comparison with a vaginal pathogen taken as reference. The effect was specific and not attributable to the generic toxicity of the supernatants to the cells. Our results pave the way for the development of probiotics to limit the impact of HSV-1 infection on women’s health. Full article
(This article belongs to the Special Issue The Role of the Vaginal Microbiome in Women’s Health and Disease)
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12 pages, 1256 KiB  
Article
TRiCit: A High-Throughput Approach to Detect Trichomonas vaginalis from ITS1 Amplicon Sequencing
by Mykhaylo Usyk, Nicolas F. Schlecht, Shankar Viswanathan, Ana Gradissimo, Negin Valizadegan, Christopher C. Sollecito, Anne Nucci-Sack, Angela Diaz and Robert D. Burk
Int. J. Mol. Sci. 2023, 24(14), 11839; https://doi.org/10.3390/ijms241411839 - 24 Jul 2023
Viewed by 1732
Abstract
Trichomoniasis, caused by Trichomonas vaginalis (TV), is the most common non-viral sexually transmitted infection (STI) worldwide, affecting over 174 million people annually and is frequently associated with reproductive co-morbidities. However, its detection can be time-consuming, subjective, and expensive for large cohort studies. This [...] Read more.
Trichomoniasis, caused by Trichomonas vaginalis (TV), is the most common non-viral sexually transmitted infection (STI) worldwide, affecting over 174 million people annually and is frequently associated with reproductive co-morbidities. However, its detection can be time-consuming, subjective, and expensive for large cohort studies. This case–control study, conducted at the Mount Sinai Adolescent Health Center in New York City, involved 36 women with prevalent TV infections and 36 controls. The objective was to examine Internal Transcribed Spacer region-1 (ITS1) amplicon-derived communities for the detection of prevalent TV infections with the same precision as clinical microscopy and the independent amplification of the TV-specific TVK3/7 gene. DNA was isolated from clinician-collected cervicovaginal samples and amplified using ITS1 primers in a research laboratory. Results were compared to microscopic wet-mount TV detection of concurrently collected cervicovaginal samples and confirmed against TV-specific TVK3/7 gene PCR. The area under the receiver operating characteristics curve (AUC) for diagnosing TV using ITS1 communities was 0.92. ITS1 amplicons displayed an intra-class correlation coefficient (ICC) of 0.96 (95% CI: 0.93–0.98) compared to TVK3/7 PCR fragment testing. TV cases showed an increased risk of bacterial vaginosis (BV) compared to the TV-negative controls (OR = 8.67, 95% CI: 2.24–48.54, p-value = 0.0011), with no significant differences regarding genital yeast or chlamydia infections. This study presents a bioinformatics approach to ITS1 amplicon next-generation sequencing that is capable of detecting prevalent TV infections. This approach enables high-throughput testing for TV in stored DNA from large-scale epidemiological studies. Full article
(This article belongs to the Special Issue The Role of the Vaginal Microbiome in Women’s Health and Disease)
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Review

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18 pages, 1716 KiB  
Review
Gynecological Cancers and Microbiota Dynamics: Insights into Pathogenesis and Therapy
by Giovanna Cocomazzi, Lino Del Pup, Viviana Contu, Gabriele Maggio, Lodovico Parmegiani, Walter Ciampaglia, Daniele De Ruvo, Raffaele Faioli, Annamaria Maglione, Giorgio Maria Baldini, Domenico Baldini and Valerio Pazienza
Int. J. Mol. Sci. 2024, 25(4), 2237; https://doi.org/10.3390/ijms25042237 - 13 Feb 2024
Cited by 4 | Viewed by 3385
Abstract
In recent years, the relationship between the microbiota and various aspects of health has become a focal point of scientific investigation. Although the most studied microbiota concern the gastrointestinal tract, recently, the interest has also been extended to other body districts. Female genital [...] Read more.
In recent years, the relationship between the microbiota and various aspects of health has become a focal point of scientific investigation. Although the most studied microbiota concern the gastrointestinal tract, recently, the interest has also been extended to other body districts. Female genital tract dysbiosis and its possible impact on pathologies such as endometriosis, polycystic ovary syndrome (PCOS), pelvic inflammatory disease (PID), and gynecological cancers have been unveiled. The incursion of pathogenic microbes alters the ecological equilibrium of the vagina, triggering inflammation and compromising immune defense, potentially fostering an environment conducive to cancer development. The most common types of gynecological cancer include cervical, endometrial, and ovarian cancer, which occur in women of any age but especially in postmenopausal women. Several studies highlighted that a low presence of lactobacilli at the vaginal level, and consequently, in related areas (such as the endometrium and ovary), correlates with a higher risk of gynecological pathology and likely contributes to increased incidence and worse prognosis of gynecological cancers. The complex interplay between microbial communities and the development, progression, and treatment of gynecologic malignancies is a burgeoning field not yet fully understood. The intricate crosstalk between the gut microbiota and systemic inflammation introduces a new dimension to our understanding of gynecologic cancers. The objective of this review is to focus attention on the association between vaginal microbiota and gynecological malignancies and provide detailed knowledge for future diagnostic and therapeutic strategies. Full article
(This article belongs to the Special Issue The Role of the Vaginal Microbiome in Women’s Health and Disease)
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