The purpose of this study was to investigate the influence of selective den
ervation of the rat pancreas on hormone secretion and on peripheral insulin
sensitivity. Thirteen rats, 7 denervated and 6 sham operated, received an
intravenous glucose challenge for 30 min. The basal plasma levels of insuli
n, glucagon and glucose did not differ between the two groups. An augmented
insulin response to glucose was detected in the denervated group, whereas
the glucagon response was unaffected. Glucose tolerance was marginally impr
oved. Twenty-four rats, 12 denervated and 12 sham operated, received a cons
tant infusion of glucose, insulin, epinephrine and propranolol in order to
inhibit the endogenous insulin release and thus evaluate insulin sensitivit
y. No significant change in insulin sensitivity could be detected during ou
r experimental conditions. We conclude that selective denervation brings ab
out an increased insulin response to glucose, probably by interrupting a ca
techolaminergic negative tone on the beta -cell. The sympathectomized anima
ls did not disclose any apparent changes in peripheral insulin sensitivity.
Copyright (C) 2001 S.Karger AG, Basel.