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Modulation of gap junction transcript and protein expression during pregnancy in the rat
1Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, California 92037.
The Journal of Cell Biology
|February 1, 1990
Summary
Pregnancy alters gap junction expression in rat uterus and ovary, with specific connexin (Cx) transcripts like Cx43 and Cx26 changing to coordinate tissue function during parturition.
Area of Science:
- Reproductive Biology
- Cellular Biology
- Molecular Biology
Background:
- Gap junctions facilitate intercellular communication, crucial for coordinated cellular activity.
- Specific connexin (Cx) isoforms (Cx43, Cx32, Cx26) play distinct roles in various tissues.
- Understanding connexin regulation during pregnancy is vital for reproductive physiology.
Purpose of the Study:
- To investigate the expression patterns of Cx43, Cx32, and Cx26 transcripts and proteins in rat reproductive organs and other tissues during pregnancy.
- To determine if gap junction expression is modulated in a cell-specific manner during gestation and parturition.
Main Methods:
- Quantitative analysis of gap junction mRNA and protein levels (antigens) in the uterus, ovary, heart, and liver of rats at different stages of pregnancy.
- Assessment of poly(A)+ RNA concentrations to ensure cell-specific transcript changes.
Main Results:
- Strong correlation observed between gap junction mRNA and protein levels across examined organs during pregnancy.
- Significant upregulation of Cx43 transcripts in uterine myometrium and ovarian stroma just before parturition.
- Cx26 transcripts and protein showed transient elevation in the endometrial epithelium before parturition, followed by a decrease.
Conclusions:
- Cell-specific modulation of gap junction expression occurs in the uterus and ovary during pregnancy in rats.
- Differential regulation of the same gap junction gene (Cx43) in different organs (myometrium vs. heart) highlights tissue-specific control mechanisms.