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Cell surface antigen expression of first trimester chorionic villus samples.
J A Lata1, F S Cowchock, L G Jackson
1Department of Medicine, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107-5099.
Summary
Early pregnancy trophoblast expresses unique major histocompatibility complex class I antigens. These non-classical antigens are not regulated by interferon gamma, unlike other placental cells.
Area of Science:
- Immunology
- Developmental Biology
- Reproductive Science
Background:
- Trophoblast cells are crucial for pregnancy establishment and maternal-fetal immune tolerance.
- Major histocompatibility complex (MHC) class I antigens play a role in immune regulation.
- The expression of MHC class I on early trophoblast is not fully understood.
Purpose of the Study:
- To investigate the expression of MHC class I antigens on first-trimester trophoblast.
- To determine if trophoblast MHC class I expression is regulated by interferon gamma.
Main Methods:
- Indirect immunofluorescence was used to detect antigen expression on chorionic villi.
- Monoclonal antibodies, including W6/32, were employed to identify specific MHC class I determinants.
- Organ culture was performed to assess the effects of interferon gamma.
Main Results:
- First-trimester trophoblast expresses a monomorphic MHC class I determinant recognized by W6/32.
- This W6/32 recognized determinant is exclusively expressed on trophoblast and not significantly altered by interferon gamma.
- Interferon gamma increased MHC class I expression on mesenchyme and induced MHC class II expression on mesenchyme.
Conclusions:
- Early gestational trophoblast expresses non-classical MHC class I antigens.
- Trophoblast MHC class I expression appears resistant to interferon gamma regulation.
- These findings suggest unique immune-regulatory properties of early trophoblast MHC antigens.