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Specific Loss of Brain ABCA1 Increases Brain Cholesterol Uptake and Influences Neuronal Structure and Function

Karasinska, Joanna M., Rinninger, Franz, Lütjohann, Dieter, Ruddle, Piers, Franciosi, Sonia, Kruit, Janine K., Singaraja, Roshni R., Hirsch-Reinshagen, Veronica, Fan, Jianjia, Brunham, Liam R., Bissada, Nagat, Ramakrishnan, Rajasekhar, Wellington, Cheryl L., Parks, John S., Hayden, Michael R.·2009·The Journal of Neuroscience
DOI 10.1523/jneurosci.4741-08.2009PMC PMC2678874
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Abstract

The expression of the cholesterol transporter ATP-binding cassette transporter A1 (ABCA1) in the brain and its role in the lipidation of apolipoproteins indicate that ABCA1 may play a critical role in brain cholesterol metabolism. To investigate the role of ABCA1 in brain cholesterol homeostasis and trafficking, we characterized mice that specifically lacked ABCA1 in the CNS, generated using the Cre/loxP recombination system. These mice showed reduced plasma high-density lipoprotein (HDL) cholesterol levels associated with decreased brain cholesterol content and enhanced brain uptake of esterified cholesterol from plasma HDL. Increased levels of HDL receptor SR-BI in brain capillaries and apolipoprotein A-I in brain and CSF of mutant mice were evident. Cholesterol homeostasis changes were mirrored by disturbances in motor activity and sensorimotor function. Changes in synaptic ultrastructure including reduced synapse and synaptic vesicle numbers were observed. These data show that ABCA1 is a key regulator of brain cholesterol metabolism and that disturbances in cholesterol transport in the CNS are associated with structural and functional deficits in neurons. Moreover, our findings also demonstrate that specific changes in brain cholesterol metabolism can lead to alterations in cholesterol uptake from plasma to brain.

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Metadata

Authors
Karasinska, J. M., Rinninger, F., Lütjohann, D., Ruddle, P., Franciosi, S., Kruit, J. K., Singaraja, R. R., Hirsch-Reinshagen, V., Fan, J., Brunham, L. R., Bissada, N., Ramakrishnan, R., Wellington, C. L., Parks, J. S., & Hayden, M. R.
Venue
The Journal of Neuroscience
Publisher
Society for Neuroscience
Published
2009-03-18
Volume
29
Issue
11
Pages
3579-3589
ISSN
  • 0270-6474
  • 1529-2401
DOI
10.1523/jneurosci.4741-08.2009
PMC
PMC2678874
Cited by
133
References
7
Language
en
Licence
creativecommons.org/licenses/by-nc-sa/4.0/ (vor, 184 d)

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