Epinephrine-induced hyperglycemia was attenuated by the treatment of rats with pertussis vaccine, but this attenuation was abolished when endogenous insulin was suppressed by streptozotocin or anti-insulin serum. It was concluded that epinephrine-induced hyperglycemia was counterbalanced by the hypoglycemic action of insulin, the secretion of which was markedly potentiated in pertussis-sensitized rats. 2. Without epinephrine, no hypoglycemia developed in pertussis-sensitized rats despite the higher blood level of insulin. Tracer experiments with [14C,3H] glucose or [14C]bicarbaonate showed that, in pertussis-sensitized rats, more glucose was liberated into the blood from hepatic gluconeogenesis at the expense of hepatic glycogenesis, thereby accelerating the turnover of blood glucose. 3. Since this activation of hepatic glucose production was reduced by propranolol, a beta-adrenergic blocking agent, it is very likely that adrenergic beta-stimulation is, at least partly, responsible for the metabolic alterations observed in pertussis-sensitized rats.
