Do maternal cells trigger or perpetuate autoimmune diseases in children?

Area of Science:

• Immunology
• Reproductive Biology
• Cell Biology

Background:

• The placental barrier was historically considered impermeable.
• Pregnancy involves bidirectional cell transfer between mother and fetus.
• Fetal cells persist in mothers (fetal microchimerism, FMc) and maternal cells in children (maternal microchimerism, MMc) long-term.

Purpose of the Study:

• To review the implications of microchimerism in autoimmune diseases.
• To explore the role of FMc in female autoimmune disease predisposition.
• To investigate MMc as a potential initiator of chronic inflammatory disease in non-pregnant individuals.

Main Methods:

• Literature review on fetal and maternal microchimerism.
• Analysis of studies linking microchimerism to autoimmune pathogenesis.
• Examination of evidence for microchimerism in various patient populations.

Main Results:

• Fetal microchimerism (FMc) and maternal microchimerism (MMc) involve persistent foreign cells.
• Both FMc and MMc are implicated in autoimmune disease development, similar to graft-versus-host disease.
• MMc may initiate or perpetuate chronic inflammation in individuals without prior pregnancy.

Conclusions:

• The placental barrier is permeable, allowing for microchimerism.
• Microchimerism is a significant factor in the pathogenesis of autoimmune disorders.
• Further research into microchimerism is crucial for understanding and treating chronic inflammatory diseases.