Single-cell RNA sequencing reveals placental response under environmental stress

Area of Science:

• Environmental Toxicology
• Developmental Biology
• Reproductive Science

Background:

• The placenta is vital for fetal development.
• Environmental stressors like arsenic can negatively impact placental function.
• The specific placental response to arsenic exposure is not well understood.

Purpose of the Study:

• To investigate the effects of arsenic exposure on the mouse placenta at a single-cell level.
• To identify key genes and pathways involved in the placental response to arsenic.
• To explore the role of proline-rich acidic protein 1 (PRAP1) in mediating arsenic toxicity in placental cells.

Main Methods:

• Single-cell RNA sequencing of mouse placenta following arsenic exposure.
• In vitro and ex vivo experiments using human trophoblast cells.
• Analysis of gene expression, cell function, and pathological changes.
• PRAP1 gene knockdown and recombinant protein treatment.

Main Results:

• Arsenic exposure induces cell-type-specific gene expression changes in the placenta.
• Proline-rich acidic protein 1 (PRAP1) is significantly upregulated in multiple placental cell types, including trophoblasts.
• PRAP1 upregulation shows a female-biased pattern in response to arsenic.
• Recombinant PRAP1 protein reduces arsenic-induced cytotoxicity and modulates cell cycle pathways in human trophoblast cells.
• PRAP1 knockdown affects cell cycle, proliferation, and cell death in a manner dependent on arsenic presence.

Conclusions:

• PRAP1 plays a protective role against arsenic-induced placental toxicity.
• Understanding PRAP1's function offers potential therapeutic strategies for mitigating environmental stress impacts on pregnancy.
• This study provides critical insights into placental adaptation to environmental toxicants.