Previous studies indicate that decreasing cholesterol levels correlates with a decreased risk of Alzheimer's disease. Cholesterol efflux plays a role in cholesterol homeostasis and may be an important target for controlling cholesterol levels in the brain. This study will provide a better understanding of cholesterol efflux and APP processing. The study will determine whether increasing expression of brain specific CYP46 will alter Abeta levels. Using neuronal and glial cultures, 24S-hydroxycholesterol will be increased thru CYP46 transient transfection Abeta levels will be measured. The study will determine whether CYP46 inhibition thru RNAi will alter brain Abeta levels. This study will also investigate whether the human APOE genotypes affect cholesterol efflux differently in primary glial cultures and whether high cholesterol levels modulate these differences. This basic science may assist in the development of effective controls for cholesterol levels in the brain and possibly lead to future clinical treatments in Alzheimer patients.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Predoctoral Individual National Research Service Award (F31)
Project #
5F31AG025676-02
Application #
7121682
Study Section
Special Emphasis Panel (ZRG1-BDCN-L (29))
Program Officer
Snyder, Stephen D
Project Start
2005-10-01
Project End
2008-09-30
Budget Start
2006-10-01
Budget End
2007-09-30
Support Year
2
Fiscal Year
2006
Total Cost
$29,762
Indirect Cost
Name
Georgetown University
Department
Pharmacology
Type
Schools of Medicine
DUNS #
049515844
City
Washington
State
DC
Country
United States
Zip Code
20057
Cartagena, Casandra M; Burns, Mark P; Rebeck, G William (2010) 24S-hydroxycholesterol effects on lipid metabolism genes are modeled in traumatic brain injury. Brain Res 1319:1-12
Cartagena, Casandra M; Ahmed, Farid; Burns, Mark P et al. (2008) Cortical injury increases cholesterol 24S hydroxylase (Cyp46) levels in the rat brain. J Neurotrauma 25:1087-98