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Progesterone induced blocking factor isoforms in normal and failed murine pregnancies.
Agnes Bogdan1, Beata Polgar, Julia Szekeres-Bartho
1Department of Medical Microbiology and Immunology, Medical School, Pecs University, Pecs, Hungary.
American Journal of Reproductive Immunology (New York, N.Y. : 1989)
|December 12, 2013
Summary
Successful pregnancy relies on progesterone induced blocking factor (PIBF). Reduced full-length PIBF and altered isoforms in failed pregnancies may disrupt cell cycle regulation and immune suppression.
Area of Science:
- Reproductive immunology
- Molecular biology
Background:
- Progesterone induced blocking factor (PIBF) is crucial for successful pregnancy.
- Alternative splicing generates diverse PIBF isoforms with distinct functions.
- Full-length (90 kDa) PIBF regulates cell cycle; smaller forms act as cytokines.
Purpose of the Study:
- To investigate PIBF exon patterns and protein isoform profiles in normal versus failed murine pregnancies.
- To correlate PIBF expression with pregnancy outcomes.
Main Methods:
- Analysis of RNA and protein from normal and resorbed murine fetuses, placentae, and uterine tissues.
- Techniques included RT-PCR and Western blot on samples from gestation days 12-14 and 17-19.
Main Results:
- Lower expression of N-terminal exons was observed in late pregnancy and during resorption.
- Significantly reduced production of the full-length PIBF protein correlated with pregnancy failure.
Conclusions:
- Diminished full-length PIBF may impair cell cycle regulation and trophoblast invasion.
- Absence of specific PIBF isoforms (lacking exon 2-4) might compromise local immunosuppression, contributing to pregnancy loss.
