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Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
Published on: October 10, 2025
Intrauterine infection, immune system and premature birth
Fernanda Rodrigues Helmo1, Eduardo Arthur Rodovalho Alves2, Renata Alves de Andrade Moreira2
1a Department of General Pathology , Institute of Biological and Natural Sciences, Federal University of Triângulo Mineiro , Minas Gerais , Brazil.
Insights
Ascending intrauterine infection and fetal inflammatory response are key triggers for preterm birth, leading to severe neonatal complications. Early diagnosis biomarkers are crucial for managing these risks.
Area of Science:
- Reproductive biology
- Immunology
- Neonatal health
Background:
- Preterm birth causes nearly one million childhood deaths annually.
- Ascending intrauterine infection and fetal inflammatory response are primary triggers.
- Neonatal immune deficiencies exacerbate complications.
Purpose of the Study:
- To review scientific findings on the link between intrauterine infection, immune response, and preterm birth.
- To highlight the role of inflammation in preterm birth pathogenesis.
- To discuss the need for early diagnostic biomarkers.
Main Methods:
- Literature review of scientific findings.
- Analysis of inflammatory mediators (IL-1β, TNF-α, IFN-γ, IL-6).
- Examination of immune response in preterm neonates (IgG, Th1/Th2 cells).
Main Results:
- Intrauterine infection triggers intense inflammation, damaging fetal membranes and altering the cervix.
- Preterm neonates exhibit impaired immune responses, increasing susceptibility to infections.
- This inflammatory and immune triad contributes to neonatal complications like RDS and NEC.
Conclusions:
- Ascending intrauterine infection and fetal inflammatory response are critical factors in preterm birth.
- Understanding the immune system's role is vital for preventing preterm birth.
- Identifying early diagnostic biomarkers for intrauterine infection is essential.
Abstract:
Preterm birth accounts for nearly one million deaths among children under five years of age, and although its etiopathogenesis is not fully elucidated, ascending intrauterine infection and fetal inflammatory response seem to be the main triggers. The intense inflammatory response mediated by IL-1β, TNF-α, PAF, IFN-γ and IL-6, PGE2 and MMP-1 and MMP-9 causes fetal membrane damage and rupture, increased uterine contractions and biochemical and structural changes in the cervix. Furthermore, preterm neonates have deficient innate and adaptive immune responses characterized by reduced levels of IgG, opsonization and phagocytosis, as well as increased activation of Th1 cells in relation to Th2 cells. Therefore, this triad is favors the occurrence of neonatal complications, such as respiratory distress syndrome, necrotizing enterocolitis, retinopathy of prematurity and bronchopulmonary dysplasia. Due to serious maternal and child health complications of intrauterine infection, several studies have tried to identify biomarkers for the early diagnosis of this entity. This literature review aims to discuss the main scientific findings regarding the association between ascending intrauterine infection, immune system and preterm birth.
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