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CALCIUM EFFLUX AND SECRETION OF α‐AMYLASE FROM RAT PANCREAS
Author(s) -
HEISLER S.
Publication year - 1974
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1974.tb08607.x
Subject(s) - carbachol , endocrinology , medicine , calcium , extracellular , efflux , egta , amylase , secretion , chemistry , adenosine , biology , biochemistry , enzyme , stimulation
1 The efflux of 45 Ca from rat pancreas was investigated in relation to the secretion of α‐amylase. 2 The 45 Ca space in the pancreas was increased 1.6 times when pancreatic tissue was incubated in media in which the extracellular calcium concentration was reduced from 1.0 to 0.05 M m . 3 Carbachol increased the rate of 45 Ca efflux from the tissue and this effect was associated with an increase in the release of α‐amylase. Dibutyryl cyclic adenosine monophosphate (AMP) also evoked a secretory response, but did not alter the rate of 45 Ca efflux. In combination with carbachol, the dibutyryl analogue of cyclic AMP reduced the carbachol‐stimulated increase in 45 Ca efflux while enhancing the release of secretory protein. 4 The stimulatory effect of carbachol on 45 Ca efflux was observed when pancreatic tissues were incubated in media containing a high concentration of ethyléneglycolbis (β‐aminoethyl)‐ N,N ′‐tetraacetic acid (EGTA). 5 Atropine blocked the effects of carbachol on both 45 Ca efflux and secretion of α‐amylase. 6 It was concluded that intracellular calcium can and may sustain stimulus‐secretion coupling in the rat exocrine pancreas.