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Stimulatory transducing systems in pancreatic islet cells
S Emami1, K Regnauld, N Ferrand
1Institut National de la Santé et de la Recherche Médicale, Centre de Recherche Paris Saint-Antoine, France. Emami@adr.st.antoine.inserm.fr
Annals of the New York Academy of Sciences
|February 3, 1999
Summary
This study maps G protein alpha subtypes and adenylyl cyclase isoforms in pancreatic cells. Findings reveal cell-specific distributions crucial for understanding insulin and glucagon secretion regulation.
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Biology
Background:
- G proteins and adenylyl cyclases (AC) are key signaling molecules in pancreatic islet cells.
- Understanding their cellular distribution is vital for elucidating hormone secretion regulation.
Purpose of the Study:
- To determine the cellular distribution of G protein alpha subtypes and AC isoforms in pancreatic cell lines.
- To correlate this distribution with cell-specific functions like hormone secretion, differentiation, and apoptosis.
Main Methods:
- Utilized various established endocrine, exocrine, and pancreatic cell lines.
- Investigated the expression and cellular localization of G alpha subunits and AC isoforms (I-VI).
- Examined receptor protein expression for VIP, PACAP, and tGLP-1.
Main Results:
- VIP, PACAP, and tGLP-1 receptors show variable expression in A and B cells.
- G alpha subunit expression is cell-specific; G(olf) alpha in B cells, Gs alpha ubiquitously.
- AC isoform density is islet cell-specific and varies with age and species.
Conclusions:
- Specific cellular and subcellular distributions of G proteins and ACs are identified in pancreatic cells.
- These findings provide a basis for understanding intra-regulatory pathways controlling insulin/glucagon secretion.
- The data will aid in characterizing pathways involved in islet cell differentiation and apoptosis.