Starvation and triglycerides reverse the obesity-induced impairment of insulin transport at the blood-brain barrier.

Abstract:

:Insulin in the brain acts as a satiety factor, reduces appetite, and decreases body mass. Altered sensing by brain of insulin may be a leading cause of weight gain and insulin resistance. A decrease in the transport across the blood-brain barrier (BBB) of insulin may induce brain insulin resistance by inducing obesity. We here report that transport of iv administrated insulin across the BBB of obese mice, as measured by multiple-time regression analysis, was significantly lower than that in thin adult mice. The reduction in obese mice was reversed by starvation for 48 h. There were no differences in insulin transport rates across the BBB of obese, thin, or starved obese mice when studied by the brain perfusion model, demonstrating that BBB transport of insulin is modulated by circulating factors. In the brain perfusion study, the triglyceride triolein significantly increased the brain uptake of insulin, an effect opposite to that on leptin transport, in starved obese mice. Thus, circulating triglycerides are one of the systemic modulators for the transport of insulin across the BBB.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Urayama A,Banks WA

doi

10.1210/en.2008-0008

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

3592-7

issue

7

eissn

0013-7227

issn

1945-7170

pii

en.2008-0008

journal_volume

149

pub_type

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