PMID- 6454601 OWN - NLM STAT- MEDLINE DCOM- 19810925 LR - 20190515 IS - 0012-1797 (Print) IS - 0012-1797 (Linking) VI - 30 IP - 8 DP - 1981 Aug TI - Diabetes induced with multiple subdiabetogenic doses of streptozotocin: lack of protection by exogenous superoxide dismutase. PG - 634-8 AB - The addition of exogenous superoxide dismutase (SOD) was examined as a possible means of protecting B-cells of mice against either the immediate or delayed toxicity caused by multiple injections of low doses of streptozotocin (Sz). Three different routes of SOD administration (i.p. and i.v. injection and continuous s.c. infusion) and several different doses and schedules were tried. In addition, a long-acting derivative of SOD was synthesized and tested. Despite the observation of a modest delay in the onset of diabetes in one experiment, no protective effect of SOD on the progressive elevation of blood glucose concentrations was evident in the majority of studies. Moreover, a loss in pancreatic insulin content and a tripling of pancreatic glucagon content occurred in all mice treated with low dosages of Sz, irrespective of whether or not either SOD or a long-acting derivative of SOD was administered. Finally, in parallel experiments in vitro, this enzyme was ineffective in protecting isolated rat islets from the acute toxicity of exposure to Sz on glucose-stimulated insulin release. FAU - Gold, G AU - Gold G FAU - Manning, M AU - Manning M FAU - Heldt, A AU - Heldt A FAU - Nowlain, R AU - Nowlain R FAU - Pettit, J R AU - Pettit JR FAU - Grodsky, G M AU - Grodsky GM LA - eng GR - AM01410/AM/NIADDK NIH HHS/United States GR - AM21933/AM/NIADDK NIH HHS/United States PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Diabetes JT - Diabetes JID - 0372763 RN - 0 (Blood Glucose) RN - 0 (Insulin) RN - 5W494URQ81 (Streptozocin) RN - 9007-92-5 (Glucagon) RN - EC 1.15.1.1 (Superoxide Dismutase) SB - IM MH - Animals MH - Blood Glucose/*metabolism MH - Diabetes Mellitus, Experimental/*blood MH - Glucagon/metabolism MH - Half-Life MH - Insulin/metabolism MH - Male MH - Mice MH - Pancreas/drug effects/metabolism MH - Streptozocin/*administration & dosage MH - Superoxide Dismutase/administration & dosage/*pharmacology EDAT- 1981/08/01 00:00 MHDA- 1981/08/01 00:01 CRDT- 1981/08/01 00:00 PHST- 1981/08/01 00:00 [pubmed] PHST- 1981/08/01 00:01 [medline] PHST- 1981/08/01 00:00 [entrez] AID - 10.2337/diab.30.8.634 [doi] PST - ppublish SO - Diabetes. 1981 Aug;30(8):634-8. doi: 10.2337/diab.30.8.634.