Partial pancreatectomy in rats causes an impairment of the glucose-induced stimulation of pancreatic islet blood flow.
Adult rats were subjected to either a sham operation (S-rats) or a 60% partial pancreatectomy (P-rats). Both P- and S-rats were normoglycemic and normoinsulinemic after surgery. Four weeks later, the animals were injected i.v. with 1 ml of either 0.9% (w/v) saline or 30% (w/v) D-glucose, and after 5 min whole pancreatic blood flow (PBF) and islet blood flow (IBF) were measured, using a microsphere technique. In the saline-injected P-rats both PBF and IBF values were higher than in S-rats (p less than 0.001 for both values). Administration of glucose had no effects on PBF in either S- or P-rats when compared to saline-injected animals. IBF was, however, markedly increased (p less than 0.01) by glucose in S-rats in comparison with saline-injected S-rats, whilst no difference in IBF was observed between glucose- and saline-injected P-rats. The fraction of PBF diverted through the islets (fIBF) was approximately 10% in S-rats and 20% in P-rats. Glucose increased fIBF in S-rats, but had no effect in P-rats. In conclusion, in S-rats a glucose-stimulated insulin release is accompanied by an increase in IBF, but this is not observed in P-rats.
Jansson
L
L
Department of Medical Cell Biology, Biomedical Center, Uppsala University, Sweden.
Sandler
S
S
D000818:Animals; D001783:Blood Flow Velocity; D001786:Blood Glucose / Q000378:metabolism; D005947:Glucose / Q000494:pharmacology*; D007328:Insulin / Q000097:blood; D007515:Islets of Langerhans / Q000098:blood supply*; D008297:Male; D010180:Pancreatectomy; D051381:Rats; D011919:Rats, Inbred Strains
D001786:Blood Glucose; D007328:Insulin; D005947:Glucose