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DCEBIO stimulates Cl- secretion in the mouse jejunum
Kirk L Hamilton1, Matt Kiessling
1Dept. of Physiology, School of Medical Sciences, Univ. of Otago, PO Box 913, Dunedin, New Zealand. kirk.hamilton@stonebow.otago.ac.nz
American Journal of Physiology. Cell Physiology
|September 2, 2005
Summary
The compound 5,6-dichloro-1-ethyl-1,3-dihydro-2H-benzimidazol-2-one (DCEBIO) stimulates chloride (Cl-) secretion in mouse jejunum. This effect involves cyclic AMP-dependent protein kinase (PKA) and targets key components of the secretory mechanism.
Area of Science:
- Gastrointestinal Physiology
- Ion Transport Mechanisms
- Pharmacology
Background:
- The jejunum plays a crucial role in intestinal fluid and electrolyte balance.
- Understanding modulators of chloride secretion is vital for addressing diarrheal diseases.
- The specific mechanisms by which compounds influence jejunal ion transport require elucidation.
Purpose of the Study:
- To investigate the effects of 5,6-dichloro-1-ethyl-1,3-dihydro-2H-benzimidazol-2-one (DCEBIO) on mouse jejunal chloride secretion.
- To elucidate the signaling pathways and ion channels involved in DCEBIO-mediated Cl- secretion.
- To compare the potency of DCEBIO with its parent compound.
Main Methods:
- Ussing short-circuit current (Isc) technique in mouse jejunum.
- Concentration-response studies with DCEBIO.
- Inhibition studies using forskolin, bumetanide, glibenclamide, NPPB, clotrimazole, and H89.
Main Results:
- DCEBIO induced a concentration-dependent increase in Isc, indicating Cl- secretion.
- Involvement of CFTR and IKCa channels was suggested by inhibition studies.
- The DCEBIO response is mediated via a cAMP/PKA-dependent pathway.
Conclusions:
- DCEBIO is a potent stimulator of Cl- secretion in the mouse jejunum.
- DCEBIO acts through a cAMP/PKA-dependent mechanism, involving CFTR and IKCa.
- DCEBIO represents a novel modulator targeting intestinal Cl- secretory pathways.