Central nervous insulin administration does not potentiate the acute glucoregulatory impact of concurrent mild hyperinsulinemia.

Abstract:

:Experiments in rodents suggest that hypothalamic insulin signaling essentially contributes to the acute control of peripheral glucose homeostasis. Against this background, we investigated in healthy humans whether intranasal (IN) insulin, which is known to effectively reach the brain compartment, impacts systemic glucose metabolism. Twenty overnight-fasted healthy, normal-weight men were IN administered 210 and 420 international units [IU] (10 and 20 IU every 15 min) of the insulin analog aspart (ins-asp) and placebo, respectively, during experimental sessions lasting 6 h. The use of ins-asp rather than human insulin enabled us to disentangle exogenous and endogenous insulin kinetics. IN insulin dose-dependently decreased plasma glucose concentrations while reducing C-peptide and attenuating endogenous insulin levels. However, we also observed a slight dose-dependent permeation of ins-asp into the circulation. In control experiments mimicking the systemic but not the central nervous uptake of the IN 210 IU dose via intravenous infusion of ins-asp at a dose of 0.12 IU/kg/24 h (n = 10), we obtained essentially identical effects on fasting plasma glucose concentrations. This pattern indicates that sustained IN insulin administration to the human brain to enhance central nervous insulin signaling does not acutely alter systemic glucose homeostasis beyond effects accounted for by concurrent mild hyperinsulinemia.

journal_name

Diabetes

journal_title

Diabetes

authors

Ott V,Lehnert H,Staub J,Wönne K,Born J,Hallschmid M

doi

10.2337/db14-0931

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

760-5

issue

3

eissn

0012-1797

issn

1939-327X

pii

db14-0931

journal_volume

64

pub_type

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