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Nicotonic and muscarinic components in acetylcholine stimulation of porcine adrenal medullary cells

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Abstract

Adrenal medullary chromaffin cells secrete catecholamines (CA) in response to cholinergic receptor activation by acetylcholine (ACh) released from splacnic nerve terminals. In cultured bovine chromaffin cells nicotinic receptors play a preponderant (> 90%) role in the control of CA release. By contrast, we found and report here that up to 40% of the ACh-evoked CA secretion from cultured porcine chromaffin cells can be associated with muscarinic receptor activation. The following results support our belief that in porcine adrenal medullary cells ACh (100 μM) evoked CA secretion is mediated by both nicotinic and muscarinic cholinergic receptors. 1) Hexamethonium (100 μM), a nicotinic receptor antagonist, inhibited ACh-induced CA secretion to ca. 40% of the control release and atropine (1 μM), a muscarinic receptor antagonist, inhibited to ca. 60% of the control value. 2) We also found that ACh (100 μM) evoked intracellular Ca2+ concentration ([Ca2+]i) rise was inhibited by these receptor antagonists to a different extent, and reversibly reduced by lowering the concentration of Ca2+ in the external medium ([Ca2+]o). This last maneuver ([Ca2+]o < 0.1 μM) per se caused a marked reduction in the peak phase of the [Ca2+]i rise evoked by ACh (40% of the control response). Switching the external medium back to physiologic [Ca2+]o in the continued presence of ACh caused a partial recovery of the elevated [Ca2+]i. This [Ca2+]o-dependent [Ca2+]i rise was blocked by hexamethonium (100 μM) but not by atropine (1 μM). Conversely, the ACh-evoked [Ca2+]i rise in low external [Ca2+]o was blocked by atropine but not by hexamethonium. From these data we conclude that in porcine adrenal medullary cells an important fraction (ca. 0.4) of both ACh-induced CA secretion and peak [Ca2+]i rise is due to muscarinic receptor activation.

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  1. Laboratorio de Fisiolog¡a Celular, Facultad de Ciencias, Universidad de Chile, Chile

    Verónica Nassar-Gentina, Luz Catalán & Mario Luxoro

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  1. Verónica Nassar-Gentina
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  2. Luz Catalán
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  3. Mario Luxoro
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Nassar-Gentina, V., Catalán, L. & Luxoro, M. Nicotonic and muscarinic components in acetylcholine stimulation of porcine adrenal medullary cells. Mol Cell Biochem 169, 107–113 (1997). https://doi.org/10.1023/A:1006867423715

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