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
Endocrinologyjournal_title
Endocrinologyauthors
Urayama A,Banks WAdoi
10.1210/en.2008-0008subject
Has Abstractpub_date
2008-07-01 00:00:00pages
3592-7issue
7eissn
0013-7227issn
1945-7170pii
en.2008-0008journal_volume
149pub_type
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