Divergent proliferative responses to a gastrin receptor ligand in synchronized and unsynchronized rat pancreatic AR42J tumour cells

被引:8
作者
Bestervelt, L [1 ]
Barr, B [1 ]
Dethloff, L [1 ]
机构
[1] Warner Lambert Parke Davis, Parke Davis Pharmaceut Res, Dept Pathol & Expt Toxicol, Ann Arbor, MI 48105 USA
关键词
gastrin receptor; AR42J; CI-988;
D O I
10.1016/S0898-6568(99)00067-4
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Depending upon experimental model, the CCK-B/gastrin receptor ligand CI-988 exhibits either agonist or antagonist activity. To confirm that CI-988 behaves as an antagonist toward gastrin-stimulated growth, its effects on cell proliferation were investigated in unsynchronized and synchronized AR42J rat pancreatic tumour cells. In unsynchronized cultures CI-988 alone had no effect, but inhibited gastrin-stimulated cell proliferation. In contrast, in synchronized cultures, CI-988 stimulated cell proliferation. Similarly, CI-988 inhibited gastrin-stimulated cAMP production in unsynchronized cells, but stimulated cAMP formation in synchronized cultures. Therefore, CI-988 stimulation of cAMP production and proliferation in AR42J cell cultures appears to be cell cycle-dependent. CI-988 inhibited gastrin-stimulated intracellular calcium ([Ca2+](i)) mobilization in both populations and thus acted as an antagonist toward this pathway. Because CCK receptor densities and affinities were similar in both cell populations, the data suggest that CI-988's divergent effects on cell proliferation are governed by postreceptor signalling events which vary with cell cycle. (C) 2000 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:53 / 61
页数:9
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