RAT-LIVER INJURY-INDUCED BY HYPOXIC ISCHEMIA AND REPERFUSION - PROTECTIVE ACTION BY SOMATOSTATINS IS INDEPENDENT FROM CHANGES IN GLUCOSE-METABOLISM

Changes in glucose metabolism mediated by natural somatostatin and two derivatives (octreotide, 008) were studied in hypoxic ischemic cell i njury of the isolated perfused rat liver. The tested somatostatin and its analogues were previously shown to exert protective actions in liv er damage induced by hypoxic ischemia and reperfusion. In isolated per fused livers of rats starved for 24 hours and unstarved rats flow rate was reduced and oxygen supply interrupted for 180 min. Then the liver s were normoxically reperfused for 30 min. Glucose and lactate concent ration, as well as LDH and GLDH activity, were determined in the efflu ent. In starved and unstarved rat livers hypoxic ischemia resulted in a substantial enzyme release. In livers harvested from unstarved rats hepatic glucose release was noticed which ceased towards prolonged low now ischemia. In livers harvested from starved rats containing low he patic glycogen concentration only minimal hepatic glucose release was present. In starved and unstarved rats pretreatment with somatostatin, octreotide, and 008 significantly reduced LDH and GLDH release (p<0.0 01). In unstarved rats natural somatostatin and octreotide pretreatmen t resulted in a substantial output of glucose during the hypoxic ische mic perfusion period (p<0.001), whereas livers with 008 pretreatment d id not show any difference in glucose release compared to controls. In livers harvested from starved rats neither somatostatin nor octreotid e nor 008 pretreatment led to a difference in glucose output observed in controls. Natural somatostatin and octreotide cause a strong hepati c glucose release even under hypoxic ischemic conditions in rat livers with filled glycogen stores. The protective action of natural somatos tatin, octreotide, and 008 is not mediated by changes in glucose metab olism, and is not related to endocrine activity.