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Molecular cloning and immunologic characterization of a novel cDNA coding for progesterone-induced blocking factor
Beata Polgar1, Gyula Kispal, Margit Lachmann
1Department of Medical Microbiology and Immunology, Pecs University Medical School, Pecs, Hungary.
Journal of Immunology (Baltimore, Md. : 1950)
|November 25, 2003
Summary
Progesterone-induced blocking factor (PIBF) is crucial for preventing pregnancy loss by modulating immune responses. This study characterized PIBF, revealing its genetic sequence and protein structure for potential therapeutic applications.
Area of Science:
- Immunology
- Reproductive Biology
- Molecular Biology
Background:
- Progesterone's immunomodulatory effects are mediated by progesterone-induced blocking factor (PIBF).
- Reduced PIBF production is observed in women experiencing threatened abortions.
- PIBF demonstrates potential in preventing pregnancy loss by influencing Th2 cytokines and NK cell activity.
Purpose of the Study:
- To map the sequence and structure of PIBF-coding cDNA.
- To characterize the encoded protein product of PIBF.
- To explore the diagnostic and therapeutic potential of PIBF.
Main Methods:
- Screening of a human liver cDNA library.
- Sequence analysis of the PIBF1 cDNA clone.
- Recombinant production and biological activity assays of PIBF.
Main Results:
- Identified a 2765-bp PIBF1 cDNA clone with a 2271-bp open reading frame.
- The PIBF1 cDNA encodes an 89-kDa protein (757 amino acids) with no known sequence homology.
- Recombinant PIBF exhibits biological activities, with the N-terminal 48-kDa portion being active and responsible for NK modulation.
Conclusions:
- The full-length PIBF localizes to the nucleus, while shorter, secreted forms are induced upon cell activation.
- Specific exons (2-4) encode the NK activity-modulating domain of PIBF.
- These findings represent a foundational step towards utilizing PIBF for diagnostic and therapeutic purposes in reproductive medicine.