Abstract：
:Acid secretion from isolated rabbit gastric parietal cells can be stimulated by gastric secretagogues, histamine (cyclic-AMP pathway) and carbachol (inositol phosphate pathway). Prostaglandins (PG) from E series are potent inhibitors of acid secretion. The intracellular mechanism of this inhibition was examined by using a stable PGE1-analogue, misoprostol. Aminopyrine (AP) accumulations due to histamine, IBMX and forskolin were dose-dependently inhibited by misoprostol, whereas a weak but significant biphasic effect on carbachol-induced AP accumulation was observed. The cyclic-AMP formation induced by histamine and IBMX were also inhibited by misoprostol in a non-competitive way. The potent effect of forskolin on cyclic-AMP levels was not modified by misoprostol in parietal cells, whereas it was potentiated in non-parietal cells. The inhibitory effect of misoprostol on AP accumulation was reduced by incubation of parietal cells with Bordetella pertussis toxin (IAP) but not with Cholera toxin (CT). Pretreatment of the cells with IAP did not alter cyclic-AMP levels of resting and histamine-stimulated parietal cells but abolished the inhibitory effect of misoprostol. Treatment with CT increased basal and histamine-stimulated cyclic-AMP levels and masked the inhibitory effect of misoprostol. The biphasic effect of misoprostol on carbachol-stimulated AP accumulation in parietal cells was confirmed on carbachol-stimulated phospholipase C activity and on [Ca2+]i stimulated by carbachol. These data confirm a direct and specific effect of the prostanoid on the Gi-subunit of the adenylate cyclase coupled to the histamine H2-receptor, and a biphasic effect on the phospholipase C pathway of the parietal cells.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Choquet A,Leonard A,Magous R,Bali JPdoi
10.1016/0006-2952(90)90608-nsubject
Has Abstractpub_date
1990-06-15 00:00:00pages
1905-11issue
12eissn
0006-2952issn
1873-2968pii
0006-2952(90)90608-Njournal_volume
39pub_type
杂志文章abstract：:The effects of two competitive antagonists and two allosteric ligands on the rate of dissociation of [3H]N-methylscopolamine ([3H]NMS) were studied at atrial muscarinic acetylcholine M2 receptors by the technique of "infinite dilution." The dissociation rate for [3H]NMS, initiated by diluting the incubation mixture in...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(96)00814-3
更新日期：1997-03-21 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(94)00512-k
更新日期：1995-03-30 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(96)00868-4
更新日期：1997-04-04 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
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更新日期：2020-05-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(91)90620-k
更新日期：1991-02-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(88)90385-1
更新日期：1988-10-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(85)90750-6
更新日期：1985-03-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(86)90460-0
更新日期：1986-07-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(85)90435-6
更新日期：1985-11-01 00:00:00
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pub_type： 杂志文章
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更新日期：2006-11-15 00:00:00
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pub_type： 杂志文章
doi：10.1016/j.bcp.2016.08.004
更新日期：2016-10-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2010.07.035
更新日期：2010-11-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(86)90303-5
更新日期：1986-06-01 00:00:00
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pub_type： 杂志文章
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更新日期：2020-05-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2016.08.011
更新日期：2016-10-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(93)90446-4
更新日期：1993-05-05 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(02)01072-9
更新日期：2002-07-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
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更新日期：2020-12-11 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2013.06.030
更新日期：2013-09-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2009.04.008
更新日期：2009-09-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2005.09.022
更新日期：2005-12-05 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
doi：10.1016/j.bcp.2007.08.007
更新日期：2008-01-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(91)90203-h
更新日期：1991-03-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(03)00412-x
更新日期：2003-09-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
doi：10.1016/s0006-2952(96)00716-2
更新日期：1997-04-25 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2006.02.013
更新日期：2006-05-28 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(00)00301-4
更新日期：2000-07-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(88)90551-5
更新日期：1988-05-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(83)90205-8
更新日期：1983-11-01 00:00:00
abstract：:The multidrug resistance (MDR) phenotype is the major cause of failure of cancer chemotherapy. This phenotype is mainly due to the overexpression of the human MDR1 (hMDR1) gene. Several studies have shown that transcriptional regulation of this gene is unexpectedly complex and is far from being completely understood. ...
journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
doi：10.1016/s0006-2952(02)01156-5
更新日期：2002-09-01 00:00:00
