Activation of CCK-B receptors elevates cytosolic Ca2+ levels in a pituitary cell line.
Peptides
; 14(4): 801-5, 1993.
Article
en En
| MEDLINE
| ID: mdl-8234029
ABSTRACT
Cytosolic Ca2+ levels ([Ca2+]i) in GH3 cells, a rat anterior pituitary tumor cell line, were monitored with fura-2 by fluorescence measurements. Cholecystokinin octapeptide (CCK-8) produced a transient elevation of [Ca2+]i. The elevation of [Ca2+]i by CCK-8 was inhibited by L-365,260, but not by devazepide. It was still observed when extracellular Ca2+ was eliminated, indicating that CCK-8 mobilizes Ca2+ from intracellular storage sites after interaction with CCK-B receptors. Cholecystokinin octapeptide increased the turnover of phosphatidylinositol, but it did not affect cyclic AMP levels. A possible involvement of phosphatidylinositol breakdown and calcium mobilization in the transduction system of CCK-B receptors in GH3 cells is suggested.
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Bases de datos:
MEDLINE
Asunto principal:
Adenohipófisis
/
Calcio
/
Receptores de Colecistoquinina
/
Citosol
Límite:
Animals
Idioma:
En
Revista:
Peptides
Año:
1993
Tipo del documento:
Article
País de afiliación:
Japón