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Endothelin-1 increases isoprenaline-enhanced cyclic AMP levels in cerebral cortex
M J Pérez-Alvarez1, M C Calcerrada, F Hernández
1Departamento de Bioquímica y Biología Molecular I, Facultad de Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain.
Regulatory Peptides
|March 9, 2000
Summary
Endothelin-1 (ET-1) increases cyclic AMP in rat brain cortex via ET(B) receptors. This process involves adenosine and calcium, suggesting ET-1 modulates cyclic AMP generation.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Cyclic AMP (cAMP) is a crucial second messenger in neuronal signaling.
- Endothelin-1 (ET-1) is a peptide with known roles in cardiovascular and nervous systems.
Purpose of the Study:
- To investigate the effect of ET-1 on cyclic AMP levels in the rat cerebral cortex.
- To elucidate the receptor subtype and signaling pathways involved in ET-1-mediated cAMP modulation.
Main Methods:
- Measurement of [(3)H]cyclic AMP accumulation in rat cerebral cortex tissue.
- Use of adenosine deaminase to assess adenosine's role.
- Employing specific ET(A) and ET(B) receptor antagonists (BQ-123 and BQ-788).
- Investigation of calcium dependency (extracellular and intracellular).
Main Results:
- ET-1 induced a concentration-dependent increase in cAMP accumulation.
- The effect was mediated by adenosine and involved the ET(B) receptor.
- ET-1 potentiated isoprenaline-stimulated cAMP generation.
- The mechanism was dependent on both extracellular and intracellular calcium concentrations.
Conclusions:
- ET-1 modulates cyclic AMP generation in the rat cerebral cortex.
- The ET(B) receptor and calcium signaling are critical components of this modulation.
- Findings suggest a novel role for ET-1 in regulating cAMP-dependent pathways in the brain.