Insulin increases CSF Abeta42 levels in normal older adults.

Abstract:

BACKGROUND:Abnormal insulin metabolism may contribute to the clinical symptoms and pathophysiology of AD. In vitro studies show that insulin enhances the release of beta-amyloid protein (Abeta) or inhibits its degradation, either of which might increase amyloid burden. METHODS:On separate mornings, 16 healthy older adults (10 women, 6 men; mean age 68.7 years, SD 8.6 years) each underwent two infusions consisting of either saline (placebo) or insulin (1.0 mU x kg(-1) x min(-1)) plus dextrose to maintain euglycemia. After 120 minutes of infusion, blood, CSF, and cognitive measures were acquired. RESULTS:As expected, insulin infusion produced an increase in CSF insulin concentration. Insulin infusion also led to an increase in CSF Abeta42 levels, most notably in older subjects. As has been observed previously, insulin infusion facilitated declarative memory, but such facilitation was attenuated in the subjects with the greatest increase in CSF Abeta42 levels. CONCLUSIONS:These findings are consistent with recent in vitro studies of insulin effects on Abeta and support the notion that insulin may modulate Abeta42 levels acutely in humans.

journal_name

Neurology

journal_title

Neurology

authors

Watson GS,Peskind ER,Asthana S,Purganan K,Wait C,Chapman D,Schwartz MW,Plymate S,Craft S

doi

10.1212/01.wnl.0000065916.25128.25

subject

Has Abstract

pub_date

2003-06-24 00:00:00

pages

1899-903

issue

12

eissn

0028-3878

issn

1526-632X

journal_volume

60

pub_type

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