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Bile secretion is centrally regulated by C-type natriuretic peptide
Maria E Sabbatini1, Marcelo S Vatta, Cristina Vescina
1Cátedras de Fisiopatología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina.
Cellular and Molecular Neurobiology
|February 15, 2003
Summary
C-type natriuretic peptide (CNP), the brain natriuretic peptide, centrally inhibits bile secretion in rats. This effect reduces bile acid-dependent flow and alkalinizes bile without involving the autonomic nervous system.
Area of Science:
- Neuroendocrinology
- Gastroenterology
- Physiology
Background:
- C-type natriuretic peptide (CNP) is recognized as the brain natriuretic peptide.
- CNP receptors and mRNA are found in the liver and central nervous system regions regulating gastrointestinal functions.
- The role of CNP in central gastrointestinal regulation warrants further investigation.
Purpose of the Study:
- To investigate the role of centrally administered CNP in regulating bile secretion in rats.
- To elucidate the potential pathways and mechanisms underlying CNP's effect on bile secretion.
Main Methods:
- CNP was administered intracerebroventricularly in rats at doses of 1, 10, and 100 ng/microL.
- Bile was collected serially, and parameters such as bile flow, bile acid output, electrolyte excretion, and pH were analyzed.
- The involvement of the autonomic nervous system was assessed using parasympathetic and sympathetic blockade.
Main Results:
- Centrally applied CNP dose-dependently inhibited basal and bile salt-stimulated bile flow.
- CNP reduced bile acid output, sodium, and potassium excretion, indicating an effect on bile acid-dependent flow.
- CNP increased bile pH and decreased chloride excretion, but did not affect total glutathione excretion, suggesting no impact on bile acid-independent flow.
Conclusions:
- Central administration of CNP modulates bile secretion in rats.
- CNP's inhibitory effect on bile secretion is dose-dependent, alkalinizes bile, and reduces bile acid-dependent flow.
- The observed effects of CNP on bile secretion are independent of autonomic nervous system mediation, reinforcing its role as a brain natriuretic peptide.