Somatostatin binding capacity, guanylate cyclase and tyrosine phosphatase activities during pancreatic proliferation in the rat induced by gastrectomy
Autores
Rodríguez Martín, Eulalia; Valencia Torralba, Ana M.; Colás Escudero, María Begoña; García Escribano, Carmen; Rodríguez Puyol, Manuel; [et al.]Identificadores
Enlace permanente (URI): http://hdl.handle.net/10017/2318DOI: 10.1016/0196-9781(95)02023-3
ISSN: 0196-9781
Editor
Elsevier
Fecha de publicación
1995Patrocinadores
Ministerio de Educación y Ciencia
Cita bibliográfica
Peptides, 1995, v. 16, n. 8, p. 1461-1467
Palabras clave
Gastrectomy
Guanylate cyclase
Somatostatin receptors
Pancreatic acinar membranes
Somatostatin like-immunoreactivity
Rat
Proyectos
info:eu-repo/grantAgreement/MEC//PB94-0339/ES//
Tipo de documento
info:eu-repo/semantics/article
Versión
info:eu-repo/semantics/publishedVersion
Versión del editor
http://dx.doi.org/10.1016/0196-9781(95)02023-3Derechos
(c) Elsevier, 1995
Derechos de acceso
info:eu-repo/semantics/openAccess
Resumen
Gastrectomy increased pancreatic growth and this effect was associated with an increase in the number of somatostatin-14 (SS) receptors (146% of control) without altering their affinity. SS increased guanylate cyclase activity twofold in pancreatic acinar membranes from gastrectomized rats. The gastrectomy decreased pancreatic SS-like immunoreactivity (SS-LI) content (55% of control levels) and tyrosine phosphatase activity (74% of control levels). Administration of proglumide (20 mg/kg, IF), a gastrin/cholecystokinin (CCK) receptor antagonist, suppressed the inhibitory effect of gastrectomy on basal tyrosine phosphatase activity and SS-LI content, which returned to control levels. Furthermore, proglumide suppressed the increase of the number of SS receptors and of SS-stimulated guanylate cyclase activity induced by gastrectomy. All this suggests that pancreatic acinar cell growth is associated with upregulation of SS receptors, which could represent a mechanism promoted by the cell to negatively regulate the mitogenic activity of pancreatic growth factors such as CCK. In addition, the results also suggest that the negative regulation of tyrosine phosphatase activity may be important in the events involved in the pancreatic hyperplasia observed after gastrectomy.
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