New model of progressive non-insulin-dependent diabetes mellitus in mice induced by streptozotocin.
This study was designed to clarify the relationship between streptozotocin (STZ) dosage (100, 150 and 200 mg/kg i.p.) and the resulting diabetogenic response in mice (8-week-old male ICR). In this experiment, we found that a single i.p. injection of 100 mg/kg STZ is able to induce progressive diabetes mellitus, in which non-fasting serum glucose levels begin to rise from 3 weeks and continue to rise throughout the experimental period until 9 weeks. The non-fasting serum insulin levels of 100 mg/kg STZ-treated mice were normal during the experimental period. In addition, the population of insulin-immunoreactive cells (beta cells) in the islets of pancreata was slightly less than in normal mice at 9 weeks. In 200 mg/kg STZ-treated mice, on the other hand, the insulin levels were below measurable values and insulin-immunoreactive cells were not observed. It is concluded from these results that the progressive diabetic mouse model induced by a single i.p. injection of 100 mg/kg STZ, unlike 200 mg/kg STZ-induced diabetes which is insulin-dependent, is non-insulin-dependent.
Ito
M
M
Department of Pharmacology, Faculty of Pharmacy, Meijo University, Nagoya, Japan.
Kondo
Y
Y
Nakatani
A
A
Naruse
A
A
D000367:Age Factors; D000818:Animals; D000900:Anti-Bacterial Agents / Q000633:toxicity; D001786:Blood Glucose / Q000378:metabolism; D003921:Diabetes Mellitus, Experimental; D003924:Diabetes Mellitus, Type 2 / Q000139:chemically induced* / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D013311:Streptozocin
D000900:Anti-Bacterial Agents; D001786:Blood Glucose; D013311:Streptozocin