Human Chorionic Gonadotropin Influences Systemic Autoimmune Responses.

Area of Science:

• Immunology
• Endocrinology
• Rheumatology

Background:

• Systemic Lupus Erythematosus (SLE) is an autoimmune disease characterized by autoantibody production.
• Pregnancy is associated with altered immune responses, potentially impacting SLE.
• The role of pregnancy-specific factors, like human chorionic gonadotropin (hCG), in SLE pathogenesis is unclear.

Purpose of the Study:

• To investigate whether physiological concentrations of hCG can influence immune parameters in non-pregnant, lupus-prone mice.
• To assess the impact of hCG on autoreactivity and autoantibody production in a lupus model.

Main Methods:

• Administration of hCG to non-pregnant, lupus-prone mice.
• Analysis of autoantibody levels (e.g., anti-dsDNA, anti-RNP68, anti-phospholipids).
• In vitro studies using splenic cell cultures stimulated with hCG, TLR ligands, or TCR stimuli to assess immune cell responses.

Main Results:

• hCG administration heightened global autoreactivity, increasing autoantibodies against dsDNA, RNP68, Protein S, Protein C, β2-glycoprotein 1, and phospholipids.
• hCG showed synergistic effects with TLR and TCR stimuli in splenic cell cultures, enhancing B cell costimulatory markers, T cell proliferation, cytokine production, and p38 phosphorylation.
• hCG administration led to adverse effects on animal survival and increased autoantibody generation against apoptotic blebs.

Conclusions:

• hCG can promote autoreactive responses in a lupus environment by affecting adaptive immune cells.
• These findings suggest hCG may contribute to the development or exacerbation of humoral autoimmunity in SLE.
• The study provides insights into the association between hCG levels and the onset of autoimmune diseases.