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Diabetes, Vol 37, Issue 1 112-118, Copyright © 1988 by American Diabetes Association

ARTICLES

Synergistic effects of adjuvants, endotoxin, and fasting on induction of diabetes with multiple low doses of streptozocin in rats

JR Wright and PE Lacy
Department of Pathology, Washington University School of Medicine, St. Louis, MO 63110.

Three weekly intraperitoneal injections of complete Freund's adjuvant (CFA) and, 1 day later, low-dose streptozocin (STZ; 25 mg/kg i.p.) have been reported to cause immune destruction of beta-cells and a gradual onset of diabetes mellitus. In this study, male Lewis rats were injected intraperitoneally with CFA and 1 day later with low-dose STZ; these were repeated at weekly intervals for 3 wk. The incidence of diabetes mellitus (nonfasted plasma glucose greater than 200 mg/dl) in wk 1, 2, 3, and 4 was 50, 80, 93, and 100%, respectively. Rats receiving either CFA or STZ only did not develop diabetes. Injections of either the components of CFA (incomplete Freund's adjuvant and Mycobacterium butyricum), another granuloma-inducing organism (Listeria monocytogenes), or endotoxin before STZ induced diabetes, but the onset was slower and the diabetes was less severe than with CFA and STZ. Because intraperitoneal CFA injections caused peritoneal irritation, acute weight loss, and hypoglycemia on the day after injection, we examined whether fasting alone potentiated low-dose STZ. Fasting for 24 h before and 24 h after low-dose STZ caused diabetes that was similar in rapidity of onset and severity to that induced with CFA and STZ. Administration of CFA subcutaneously before STZ did not cause hypoglycemia or weight loss but did cause diabetes. Thus, the fasting effect of intraperitoneal CFA was not responsible for the induction of diabetes with CFA and STZ. These data indicate that immunologic adjuvants, endotoxin, and fasting all potentiate the diabetogenic action of low-dose STZ.(ABSTRACT TRUNCATED AT 250 WORDS)
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Copyright © 1988 by the American Diabetes Association.