Transforming growth factor beta as an immunosuppressive protein in human seminal plasma
1Department of Diagnostic Immunology Research and Biochemistry, Roswell Park Cancer Institute, New York State Department of Health, Buffalo 14263.
Insights
Human seminal plasma contains transforming growth factor beta (TGF-beta), an immunosuppressive protein. This finding offers insights into seminal plasma
Area of Science:
- Immunology
- Biochemistry
- Reproductive Biology
Background:
- Human seminal plasma exhibits significant immunosuppressive properties.
- Understanding the molecular basis of this immunosuppression is crucial for reproductive health and disease research.
Purpose of the Study:
- To identify and characterize the specific proteins responsible for the immunosuppressive activity in human seminal plasma.
Main Methods:
- Gel filtration chromatography was employed to isolate protein fractions from seminal plasma.
- Assays were conducted to evaluate the inhibition of DNA synthesis and cytotoxic activity of interleukin-2 stimulated lymphocytes.
- A mink lung cell bioassay and Western immunoblotting were used to detect transforming growth factor beta (TGF-beta).
Main Results:
- Fractions with molecular weights between 100 and >440 kDa demonstrated immunosuppressive effects.
- These fractions inhibited DNA synthesis in lymphocytes and showed activity in a TGF-beta bioassay.
- The immunosuppressive activity was neutralized by a TGF-beta specific antibody, and TGF-beta was confirmed via Western immunoblot.
Conclusions:
- Transforming growth factor beta (TGF-beta) is identified as a key immunosuppressive protein in human seminal plasma.
- This discovery provides a molecular basis for seminal plasma's immunosuppressive role in reproduction and potentially in neoplasia.
Problem:
Human seminal plasma is known to exhibit immunosuppressive activity in seminal plasma.
Purpose:
The purpose was to characterize immunosuppressive proteins in seminal plasma.
Method:
Gel filtration fractions of 100 to > 440 kDa were identified that inhibited DNA synthesis and killing activity of interleukin-2 stimulated lymphocytes.
Results:
The fractions exhibiting immunosuppression also inhibited DNA synthesis in a mink lung cell bioassay commonly used to measure the activity for transforming growth factor beta (TGF-beta). The negative growth activity was diminished by a TGF-beta neutralizing monoclonal antibody. TGF-beta was further detected in the active fractions by Western immunoblot.
Conclusions:
These results identified TGF-beta as an immunosuppressive protein in human seminal plasma and may provide insight into the role of immunosuppression played by seminal plasma, such as in reproduction and neoplasia.
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