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Rees WD, Garner A, Turnberg LA: Studies of acid and alkaline secretion by rabbit gastric fundus in vitro: effect of low concentrations of sodium taurocholate. Gastroenterology. 1982 Aug;83(2):435-40.
The effect of low concentrations of sodium taurocholate on the secretory and electrical activity of isolated rabbit fundic mucosa has been studied. Fundic mucosa maintained a stable potential difference (10.2 +/- 0.6 mV, n = 70) and electrical resistance (85 +/- 6 omega . cm-2, n = 70) and the majority of preparations spontaneously secreted acid (2.85 +/- 0.31 mumol . cm-2 . h-1, n = 70). Histamine (10 (-5) and 10 (-4) M) and carbachol (10-4 M) increased acid secretion, and these responses were prevented by cimetidine (10 (-3) M) and atropine (10 (-5) M), respectively. Mucosal application of taurocholate (10 (-4) and 10 (-3) M) increased net acidity without altering electrical activity. This response exhibited tachyphylaxis, was not altered by pretreating the tissues with cimetidine (10 (-3) M), atropine (10 (-5) M), or somatostatin (10 (-6) M), and occurred in mucosas maximally stimulated by histamine. Sodium thiocyanate (6 x 10 (-2) M, serosal side) inhibited spontaneous acid secretion revealing net alkalinization (0.83 +/- 0.05 mumol . cm-2 . h-1, n = 58) that was completely inhibited by anoxia and potassium cyanide (10 (-2) M) and markedly reduced by 2,4-dinitrophenol (10 (-4) M). Some fundic preparations spontaneously secreted alkali (1.20 +/- 0.20 mumol . cm-2 . h-1, n = 6) after an initial period of acid secretion. Mucosal-side taurocholate (10 (-3) M) converted net alkali secretion by both thiocyanate-treated and spontaneously-secreting mucosas to acid secretion without affecting electrical conductance. These secretory responses may be implicated in the pathogenesis of gastric mucosal damage by bile salts. |
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