Iron-dependent oxidative stress as a pathogenesis for preterm birth

Area of Science:

• Obstetrics and Gynecology
• Reproductive Medicine
• Molecular Pathogenesis

Background:

• Preterm birth (PTB) is an oxidative stress-related condition with poorly understood pathogenesis.
• Effective therapies for PTB are limited due to gaps in understanding its molecular mechanisms.
• Genomic and proteomic studies are beginning to reveal mediators involved in PTB.

Purpose of the Study:

• To review molecular pathways implicated in the pathogenesis of preterm birth.
• To elucidate the mechanisms underlying PTB development, crucial for prevention and treatment.
• To discuss the role of oxidative stress, heme, and iron in PTB pathophysiology.

Main Methods:

• Comprehensive review of English language literature on PTB pathogenesis and pathophysiology.
• Analysis of recent genomic and proteomic studies relevant to PTB biology.
• Discussion of heme/iron-mediated signaling pathways and their target genes.

Main Results:

• Decidual hemorrhage, identified in PTB placentas, leads to elevated free heme and iron levels.
• PTB-associated genes and proteins show overlap with iron-regulated pathways, oxidative stress, and detoxification.
• Free iron causes oxidative damage to lipids, proteins, and DNA, contributing to PTB.

Conclusions:

• Heme/iron-mediated signaling and associated gene targets present challenges and opportunities for understanding PTB.
• A novel model for PTB pathogenesis is proposed.
• Decidual hemorrhage and inflammation are identified as major contributors to preterm birth.