Prenatal PM_2.5 exposure affects embryonic hematopoietic development through SOX2-regulated gene expression

Area of Science:

• Environmental Health
• Developmental Biology
• Hematology

Background:

• Fine particulate matter (PM2.5) is a significant air pollutant linked to adverse birth outcomes.
• Embryonic hematopoiesis is crucial for fetal survival and involves multiple developmental stages and sites.
• Disruptions in embryonic hematopoiesis may profoundly affect developmental trajectories.

Purpose of the Study:

• To investigate the impact of prenatal PM2.5 exposure on embryonic hematopoietic development.
• To identify specific alterations in hematopoietic stem and progenitor cells following PM2.5 exposure.
• To elucidate the molecular mechanisms underlying PM2.5-induced hematopoietic dysregulation.

Main Methods:

• Establishment of a prenatal PM2.5 exposure mouse model.
• Flow cytometry and colony-forming unit assays to assess hematopoietic progenitor cell function.
• Bioinformatic analysis, quantitative real-time PCR, chromatin immunoprecipitation, and immunofluorescence to identify molecular targets.

Main Results:

• Prenatal PM2.5 exposure led to decreased embryo weights and altered platelet counts.
• Significant reduction in erythro-myeloid progenitor proliferation and hematopoietic stem progenitor cell number/function observed.
• Alterations were linked to cell proliferation, differentiation, hypoxia response, and SOX2 gene regulation.

Conclusions:

• Prenatal PM2.5 exposure disrupts embryonic hematopoiesis, impacting critical progenitor populations.
• SOX2 and related genes are key molecular mediators of PM2.5 effects on embryonic development.
• Reducing PM2.5 exposure is essential for protecting child health in polluted regions.