Placenta suppresses experimental autoimmune hypophysitis through soluble TNF receptor 1
Melissa A Landek-Salgado1, Noel R Rose, Patrizio Caturegli
1Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Journal of Autoimmunity
|July 27, 2011
Summary
Pregnancy promotes immune tolerance by using placental proteins to locally block the tumor necrosis factor-alpha (TNF-α) pathway, suppressing autoimmune hypophysitis. This local inhibition is key to maternal-fetal immune adaptation.
Area of Science:
- Immunology
- Reproductive Biology
- Autoimmunity
Background:
- Pregnancy significantly influences autoimmune diseases, with mechanisms often involving the placenta.
- Autoimmune hypophysitis is a condition strongly linked to pregnancy, offering a model to study these interactions.
Purpose of the Study:
- To investigate the placenta's role in immune tolerance during pregnancy.
- To assess if placental proteins can suppress autoimmune hypophysitis in a mouse model.
Main Methods:
- Administration of mouse placental proteins to mice with autoimmune hypophysitis.
- Proteomic analysis to identify key molecules in placental suppressive activity.
- Utilizing placentas from mice deficient in TNF receptor 1 to test pathway involvement.
Main Results:
- Placental proteins suppressed both cellular and humoral aspects of autoimmune hypophysitis.
- Suppression was specific to self-antigens, not foreign ones.
- Soluble TNF receptor 1 was abundant in placenta, and its blockade locally suppressed disease.
Conclusions:
- The placenta contributes to pregnancy-induced immune tolerance.
- Local inhibition of the tumor necrosis factor-alpha (TNF-α) pathway by placental factors is a key mechanism.
- This local action is crucial for preventing autoimmunity during pregnancy.
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