Characterization of hepatic glucose metabolism disorder with the progress of diabetes in male Spontaneously Diabetic Torii rats.
The Spontaneously Diabetic Torii (SDT) rat has recently been established as a new model of non-obese type 2 diabetes. In this study, we examined changes in hepatic glucose metabolism in prediabetic and diabetic SDT rats compared with age-matched control rats. The prediabetic state was confirmed at 16 weeks of age, and the diabetic state was confirmed at 24 and 32 weeks of age. Decreases in glucokinase mRNA levels and activity were observed in the prediabetic state. In this state, glycogen synthase activity and glycogen content were also decreased in the SDT rat. In addition to the above changes, glycogen phosphorylase mRNA and activity were decreased and gluconeogenetic enzyme mRNA levels were significantly increased in the diabetic state. These results indicate there is a great potential that abnormalities in hepatic glucose metabolism play a role in the progression to onset of diabetes. We suggest that the SDT rat is a valuable diabetic model for investigations into mechanisms or causes of progression to diabetes.
Morinaga
Hisayo
H
Japan Tobacco Inc., Central Pharmaceutical Research Institute, Osaka, Japan. hisayo.morinaga@ims.jti.co.jp
Yamamoto
Hiromi
H
Sakata
Kaoru
K
Fukuda
Sumiaki
S
Ito
Makoto
M
Sasase
Tomohiko
T
Miyajima
Katsuhiro
K
Ueda
Nobuhisa
N
Ohta
Takeshi
T
Matsushita
Mutsuyoshi
M
D000375:Aging; D000818:Animals; D002784:Cholesterol / Q000097:blood; D017931:DNA Primers; D003922:Diabetes Mellitus, Type 1 / Q000201:enzymology / Q000235:genetics*; D018450:Disease Progression; D005941:Glucokinase / Q000235:genetics / Q000378:metabolism; D005943:Gluconeogenesis / Q000235:genetics; D018149:Glucose Intolerance / Q000378:metabolism*; D007004:Hypoglycemic Agents / Q000627:therapeutic use; D007328:Insulin / Q000627:therapeutic use; D008099:Liver / Q000201:enzymology / Q000378:metabolism*; D008297:Male; D011236:Prediabetic State / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D011919:Rats, Inbred Strains; D014280:Triglycerides / Q000097:blood
D017931:DNA Primers; D007004:Hypoglycemic Agents; D007328:Insulin; D012333:RNA, Messenger; D014280:Triglycerides; D002784:Cholesterol; D005941:Glucokinase