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Structural specificity for prostaglandin effects on hepatocyte glycogenolysis
1Department of Medicine, Case Western Reserve University, Cleveland, OH 44106.
The Biochemical Journal
|April 1, 1990
Summary
Prostaglandins PGF2 alpha and PGB2 directly inhibit liver cell glucose production by blocking glucagon signaling. These findings suggest prostaglandins act as intra-hepatic regulators of glucose metabolism.
Area of Science:
- Hepatology
- Endocrinology
- Biochemistry
Background:
- Prostaglandins (PGs) influence hepatic glucose metabolism.
- The direct cellular mechanisms of PG action on hepatocytes remain unclear.
Purpose of the Study:
- To investigate the direct effects of various prostaglandins on isolated rat hepatocytes.
- To elucidate the specific molecular pathways involved in prostaglandin-mediated regulation of hepatic glucose metabolism.
Main Methods:
- Isolated rat hepatocytes were used to study glycogenolysis.
- Glucagon-stimulated cyclic AMP accumulation and adenylate cyclase activity were measured.
- Hepatocytes were treated with different prostaglandins (PGE2, PGF2 alpha, PGB2, PGD2, PTA2) and phenylephrine.
Main Results:
- PGF2 alpha and PGB2 inhibited glucagon-stimulated glycogenolysis and cyclic AMP accumulation.
- PGE2, PGF2 alpha, and PGB2 inhibited glucagon-stimulated adenylate cyclase activity.
- No tested prostaglandin stimulated glycogenolysis; PGE2 and PGF2 alpha may be intra-hepatic modulators.
Conclusions:
- PGE2 and PGF2 alpha directly inhibit glucagon-stimulated adenylate cyclase activity in hepatocytes.
- Prostaglandins PGF2 alpha and PGB2 are identified as direct inhibitors of hepatic glucose production.
- These findings highlight the role of specific prostaglandins as intra-hepatic modulators of glucose metabolism.