TY - JOUR
T1 - Possible role of nitric oxide in catecholamine secretion by chromaffin cells in the presence and absence of cultured endothelial cells
AU - Torres, Magdalena
AU - Ceballos, Guillermo
AU - Rubio, Rafael
PY - 1994/9
Y1 - 1994/9
N2 - We studied the effect of cultured endothelial cells on the secretion of catecholamines by cultured bovine chromaffin cells. Chromaffin cell catecholamine secretion was stimulated by either boluses of potassium (K+) or the nicotinic agonist 1,1-dimethyl-4-phenylpiperazinium (DMPP). Endothelial cells inhibited the catecholamine release and stimulatory effects of K+ and DMPP. This inhibition increased with time, and in 25 min the initial stimulated secretory response (100%) to 30 mM K+ or 25 μM DMPP dropped to 45 ± 3% and 53.5 ± 2.3%, respectively. This endothelial cell- induced inhibition was blocked by the nitric oxide synthase inhibitors N- nitro-L-arginine methyl ester (L-NAME) and N-monoethyl-L-arginine (L-NMMA), and by the guanylate cyclase inhibitor methylene blue, indicating that the L- arginine/nitric oxide/cyclic GMP pathway is involved in this endothelial cell-chromaffin cell interaction. In the absence of endothelial cells, incubation of chromaffin cells with L-NAME, L-NMMA, or methylene blue also augmented the secretagogue-induced catecholamine secretion, indicating that nitric oxide from chromaffin cells could be implicated in an autoinhibitory process of catecholamine release. These results provide indirect evidence for the presence of nitric oxide synthase in bovine adrenomedullary chromaffin cells. Our results show that there is an autoinhibitory mechanism of catecholamine release in chromaffin cells and that an additional level of inhibition is observed when cultured vascular endothelial cells are present. These two inhibitory processes may have different origins, but they appear to converge into a common pathway, the L-arginine/nitric oxide synthase/guanylate cyclase pathway.
AB - We studied the effect of cultured endothelial cells on the secretion of catecholamines by cultured bovine chromaffin cells. Chromaffin cell catecholamine secretion was stimulated by either boluses of potassium (K+) or the nicotinic agonist 1,1-dimethyl-4-phenylpiperazinium (DMPP). Endothelial cells inhibited the catecholamine release and stimulatory effects of K+ and DMPP. This inhibition increased with time, and in 25 min the initial stimulated secretory response (100%) to 30 mM K+ or 25 μM DMPP dropped to 45 ± 3% and 53.5 ± 2.3%, respectively. This endothelial cell- induced inhibition was blocked by the nitric oxide synthase inhibitors N- nitro-L-arginine methyl ester (L-NAME) and N-monoethyl-L-arginine (L-NMMA), and by the guanylate cyclase inhibitor methylene blue, indicating that the L- arginine/nitric oxide/cyclic GMP pathway is involved in this endothelial cell-chromaffin cell interaction. In the absence of endothelial cells, incubation of chromaffin cells with L-NAME, L-NMMA, or methylene blue also augmented the secretagogue-induced catecholamine secretion, indicating that nitric oxide from chromaffin cells could be implicated in an autoinhibitory process of catecholamine release. These results provide indirect evidence for the presence of nitric oxide synthase in bovine adrenomedullary chromaffin cells. Our results show that there is an autoinhibitory mechanism of catecholamine release in chromaffin cells and that an additional level of inhibition is observed when cultured vascular endothelial cells are present. These two inhibitory processes may have different origins, but they appear to converge into a common pathway, the L-arginine/nitric oxide synthase/guanylate cyclase pathway.
KW - Catecholamine secretion
KW - Cell-cell interactions
KW - Chromaffin cell
KW - Cyclic GMP
KW - L-Arginine
KW - Nicotinic receptors
KW - Nitric oxide
UR - http://www.scopus.com/inward/record.url?scp=0027980999&partnerID=8YFLogxK
U2 - 10.1046/j.1471-4159.1994.63030988.x
DO - 10.1046/j.1471-4159.1994.63030988.x
M3 - Artículo
SN - 0022-3042
VL - 63
SP - 988
EP - 996
JO - Journal of Neurochemistry
JF - Journal of Neurochemistry
IS - 3
ER -