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PACAP/VIP receptor subtypes, signal transducers, and effectors in pituitary cells
M Hezareh1, L Journot, L Bépoldin
1Fondation pour Recherches Médicales, University of Geneva, Switzerland.
Annals of the New York Academy of Sciences
|December 26, 1996
Summary
Pituitary cells express various pituitary tumor transforming gene 1 (PVR) subtypes, with PVR1 in gonadotrophs and PVR3 in somatotrophs. Further research is needed to understand PVR
Area of Science:
- Endocrinology
- Molecular Biology
- Cell Biology
Background:
- The pituitary gland regulates essential bodily functions through hormone secretion.
- Pituitary tumor transforming gene 1 (PVR) receptors are implicated in cellular signaling pathways.
- Understanding PVR expression in different pituitary cell types is crucial for deciphering PACAP regulation.
Purpose of the Study:
- To investigate the expression patterns of PVR receptor subtypes (PVR1, PVR2, PVR3) in rat anterior pituitary tissue and cell lines.
- To identify the specific pituitary cell types expressing different PVR subtypes and their splice variants.
- To explore the potential functional implications of differential PVR expression in pituitary cell regulation by PACAP.
Main Methods:
- Reverse transcription polymerase chain reaction (RT-PCR) to detect PVR mRNA expression.
- Analysis of PVR splice variants (PVR1s, PVR1hop) in pituitary cell lines and tissue.
- Comparison of PVR expression with known PACAP binding site distribution.
Main Results:
- Rat anterior pituitary tissue expresses PVR1, PVR3, and low levels of PVR2 mRNA.
- PVR1 is highly expressed in gonadotroph-like cells, while PVR3 is found in somatotroph-like cells.
- Significant expression of PVR1 splice variants (PVR1s, PVR1hop) was observed in alpha T3-1 cells and normal pituitary tissue.
- All three pituitary cell lines studied expressed PVR3 mRNA, contrasting with the predominance of PACAP-preferring binding sites in normal pituitary membranes.
Conclusions:
- Differential expression of PVR subtypes and splice variants occurs in rat anterior pituitary cells.
- PVR3 is expressed across different pituitary cell lines, suggesting a broad role.
- Further investigation is required to elucidate the functional consequences of PVR subtype and splice variant expression in pituitary cell regulation by PACAP.