Involvement of the hippocampus in central nervous system-mediated glucoregulation in rats.

Abstract:

:To find out whether the hippocampus is involved in central nervous system-mediated glucoregulation, we injected saline, neostigmine, dopamine, norepinephrine, bombesin, beta-endorphin, somatostatin, and prostaglandin F2 alpha into the dorsal hippocampus in anesthetized fed rats. After injection of dopamine, norepinephrine, bombesin, beta-endorphin, somatostatin, or prostaglandin F2 alpha, the level of hepatic venous plasma glucose did not differ from that in saline-treated control rats. However, neostigmine, an inhibitor of acetylcholine esterase, caused a dose-dependent increase in the hepatic venous plasma glucose concentration. This neostigmine-induced hyperglycemia was dose-dependently suppressed by coadministration of atropine, but not by hexamethonium. Injection of neostigmine (5 X 10(-8) mol) resulted in an increase not only in glucose but also in glucagon, epinephrine, and norepinephrine in hepatic venous plasma. In bilateral adrenalectomized rats, neostigmine-induced hyperglycemia was suppressed, but the hepatic venous plasma glucose concentration still increased significantly. These results indicate that the hippocampus is involved in central nervous system-mediated glucoregulation through cholinergic muscarinic activation, partly via epinephrine secretion.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Uemura K,Iguchi A,Yatomi A,Miura H,Honmura A,Yanase M,Sakamoto N

doi

10.1210/endo-124-5-2449

subject

Has Abstract

pub_date

1989-05-01 00:00:00

pages

2449-55

issue

5

eissn

0013-7227

issn

1945-7170

journal_volume

124

pub_type

杂志文章