Somatostatin Secretion from Monolayer Cultures of Neonatal Rat Pancreas*

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Abstract
Monolayer cultures of neonatal rat pancreas have been characterized as an in vitro system for studying SRIF secretion. Marked 12- and 6-fold potentiation of SRIF release occurred with iV-2-O-dibutyryl cAMP monosodium salt and theophylline, respectively. High glucose (300 mg/dl) stimulated SRIF release, whereas galactose was without effect. Exogenous insulin did not alter SRIF release, and the SRIF responses to theophylline and glucose were unaffected by the addition of antiinsulin serum to neutralize the insulin released by these agents. Arginine evoked a significant 2-fold increase in SRIF release. Exogenous glucagon produced slight but not significant stimulation of SRIF release. However, after exposure of the cultures to antiglucagon serum to diminish the concentration of glucagon in contact with the SRIF cells, exogenous glucagon produced a marked enhancement of SRIF secretion. These data suggest that glucose, arginine, glucagon, N-2-Odibutyryl cAMP monosodium salt, and theophylline stimulate SRIF secretion, probably by direct effects on D cells or through mechanisms other than increased insulin secretion. Monolayer cultures of rat pancreas should provide a powerful in vitro system for studying pancreatic SRIF physiology.