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In adult male rats injected with Pentobarbital, 50 mg.kg-1 i.p. and subjected immediately after administration of the anaesthetic to 400 revolutions (lasting of 6 min and 40 s) in rotating Noble-Collip drums the activity of the active form of hepatic phosphorylase was increased at time 0 after injury without respect to previous adrenomedullectomy or adrenalectomy (7 weeks or 10 days before, respectively). Completeness of surgery was checked by plasma catecholamines which were essentially near zero. The level of liver cAMP was increased in intact and adrenomedullectomized animals at time zero. 90 min after injury a recovery of enzyme activity towards basal levels was observed in contrast to cAMP which was increased in all the three groups. A net glycogenolytic response was found in the injured animals irrespective of previous surgery. It is concluded that for the stress induced activation of hepatic phosphorylase the presence of adrenal cortical and medullary tissue is not always indispensable.
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