Abstract:
:Wistar fatty (WF) rats are obese, hyperinsulinemic and hyperglycemic, and thus a model of type 2 diabetes mellitus. Since we have found that insulin specifically inhibits glucagon-induced glycogenolysis in perivenous hepatocytes (PVH) from normal rats, we examined the inhibitory effect of insulin on glucagon-induced glycogenolysis in PVH of hyperinsulinemic WF rats. Basal glucose release was 64.0+/-4.1 nmol/mgprotein/30 min from PVH of lean littermates (WL rats) and 137.0+/-19.3 nmol/mgprotein/30 min from that of WF rats (p<0.01). These were proportional to the glycogen content in PVH of WL and WF rats (56.7+/-7.2 and 131.0+/-20.3 microg/mgprotein, p<0.01), and increased to 109.0+/-8.8 and 225.8+/-17.9nmol/mgprotein/30min, respectively, with 0.1 nmol/l glucagon. When 10 nmol/l insulin was coincubated, 0.1 nmol/l glucagon-induced increase in glucose release decreased to 93.3+/-10.9 nmol/mgprotein/30 min in PVH of WL rats (p<0.01) and to 181+/-20.7 nmol/mgprotein/30 min in PVH of WF rats (p<0.01). Thus, insulin antagonized glucagon-induced glycogenolysis in PVH similarly between WL and WF rats, to 56.7+/-13.3% and to 46.1+/-7.5%, respectively. Thus, the antagonizing effect of insulin on glucagon-induced increase in glycogenolysis was preserved in PVH of hyperinsulinemic and hyperglycemic WF rats.
journal_name
Diabetes Res Clin Practjournal_title
Diabetes research and clinical practiceauthors
Ikezawa Y,Yamatani K,Ohnuma H,Daimon M,Manaka H,Sasaki Hdoi
10.1016/j.diabres.2004.12.008subject
Has Abstractpub_date
2005-08-01 00:00:00pages
120-3issue
2eissn
0168-8227issn
1872-8227pii
S0168-8227(05)00011-2journal_volume
69pub_type
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