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Intralobular innervation and lipocyte contractility in the liver
1Second Department of Medicine, Kurume University School of Medicine, Japan.
Nutrition (Burbank, Los Angeles County, Calif.)
|February 1, 1997
Summary
Liver lipocytes regulate blood flow via contraction and relaxation. In cirrhosis, innervation decreases, but endothelin-1 and nitric oxide become crucial for microcirculation control.
Area of Science:
- Hepatology and microcirculation research.
- Cellular biology of liver lipocytes.
Background:
- Hepatic nerve endings are distributed throughout lobules, interacting closely with lipocytes.
- Lipocytes possess contractile proteins and receptors, suggesting a role in regulating liver microcirculation.
Purpose of the Study:
- To investigate the mechanisms of lipocyte contraction and relaxation.
- To understand the role of lipocytes in hepatic sinusoidal microcirculation, particularly in liver cirrhosis.
Main Methods:
- Analysis of neurotransmitter presence (e.g., substance P) and their effect on lipocytes.
- Investigation of endothelin (ET) and nitric oxide (NO) signaling pathways in lipocytes.
- Examination of lipocyte contractility in normal versus cirrhotic liver models.
Main Results:
- Substance P and endothelin-1 induce lipocyte contraction via intracellular calcium and inositol phosphates.
- Prostaglandin E2, Iloprost, adrenomedullin, and nitric oxide cause lipocyte relaxation.
- In cirrhotic livers, intralobular innervation is reduced, while ET-1 and NO are upregulated.
Conclusions:
- Lipocytes regulate hepatic sinusoidal microcirculation through contraction and relaxation.
- In liver cirrhosis, lipocyte function is primarily modulated by ET-1 and NO, rather than innervation.