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Updated: Aug 24, 2026
A Murine Model of Fetal Exposure to Maternal Inflammation to Study the Effects of Acute Chorioamnionitis on Newborn Intestinal Development
Published on: June 24, 2020
Cytokine expression in meconium-induced lungs
Alexander Zagariya1, Rama Bhat, Shankararao Navale
1Division of Neonatology, Department of Pediatrics, The University of Illinois at Chicago, Chicago 60612-7324, USA.
Objective:
In this article the authors present relationship between meconium exposure and inflammatory cytokine release in newborn lungs.
Methods:
The authors used forty 2-week-old rabbit pups for the study. One-half of the group were instilled with meconium and the other half with saline. Rabbits were sacrificed at 0, 2, 4, 8, and 24 hrs after installation and lung lavage was obtained and was examined for cytokine mRNA expression using RT-PCR and for cytokine proteins using ELISA technique. The data were collected in each of the study group.
Results:
Meconium instillation caused significant expression of inflammatory cytokines TNFalpha, IL-6, and IL-8 (p < 0.05) with a peak at 8 hrs after meconium instillation. Levels of IL-10 were insignificant (p > 0.05). Also, we found significant increase in necrotic cells and neutrophils (p < 0.05), compared to the control, saline instilled rabbit lungs.
Conclusion:
The present studies demonstrates that meconium induces inflammatory response and cytokines gene and protein expression in the lungs.
Insights
Meconium exposure in newborn lungs triggers a significant inflammatory response, increasing inflammatory cytokines like TNF-alpha, IL-6, and IL-8. This study highlights the lung
Area of Science:
- Neonatal Physiology
- Pulmonary Inflammation
- Molecular Biology
Background:
- Meconium aspiration syndrome is a significant cause of neonatal respiratory distress.
- Understanding the early inflammatory mechanisms is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the relationship between meconium exposure and inflammatory cytokine release in newborn lungs.
- To quantify the expression of specific inflammatory mediators following meconium instillation.
Main Methods:
- Utilized 40 two-week-old rabbit pups, divided into meconium and saline instillation groups.
- Collected lung lavage samples at 0, 2, 4, 8, and 24 hours post-instillation.
- Analyzed cytokine mRNA and protein expression using RT-PCR and ELISA.
Main Results:
- Meconium instillation significantly increased TNF-alpha, IL-6, and IL-8 expression, peaking at 8 hours (p < 0.05).
- Elevated levels of necrotic cells and neutrophils were observed in meconium-exposed lungs compared to controls (p < 0.05).
- Interleukin-10 (IL-10) levels did not show significant changes (p > 0.05).
Conclusions:
- Meconium exposure induces a robust inflammatory response in the lungs.
- Cytokine gene and protein expression are significantly upregulated following meconium instillation.
- The findings provide insights into the molecular pathogenesis of meconium-induced lung injury.
