The @entity19260 responses to substance P, @entity6138 , @entity8586 , and the muscarinic cholinergic agonist @entity2710 were examined in the @entity35 pancreatoma cell line AR4-2J. It was found that each agonist produced a distinct temporal pattern of @entity19260 formation. Furthermore, these different response patterns resulted, at least in part, from different patterns of homologous receptor desensitization. The response to substance P desensitized rapidly and completely within 90 sec. After a 10-15-min refractory period, the response recovered with a t1/2 of approximately 1 hr. The response to @entity2710 also completely desensitized. However, in this case desensitization developed slowly over the course of 40 min, and no recovery of responsiveness was detected for up to 45 min after the cessation of stimulation. The @entity19260 responses to @entity6138 and @entity8586 were similar to one another and appeared to be composed of two phases. Initially, there was a robust activation of phospholipase C. This initial phase was followed within 20 sec by a second phase of lesser magnitude. For @entity6138 , attenuation of the initial phase was due to rapid, but only partial, desensitization of the response. Furthermore, the concentration of @entity6138 required to maintain the second phase of the response was about 100-fold lower than that required to maximally activate the initial phase of the response. These results may indicate multiple mechanisms for the regulation of different phospholipase C-linked receptors in this cell line.

Different modes of regulation for receptors activating phospholipase C in the XXXX pancreatoma cell line AR4-2J.

@entity19260 :: ('CHEBI:24846', 'Chemical') :: ['inositol phosphate'] @entity8586 :: ('MESH:D002766', 'Chemical') :: ['cholecystokinin'] @entity35 :: ('10116', 'Species') :: ['rat'] @entity2710 :: ('MESH:D016210', 'Chemical') :: ['methacholine'] @entity6138 :: ('MESH:D001839', 'Chemical') :: ['bombesin']
@entity35 :: (10116,Species) :: ['rat']
