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Journal of Lipid Research, Vol. 45, 263-271, February 2004
Copyright © 2004 by American Society for Biochemistry and Molecular Biology

Regulated expression of apolipoprotein E by human retinal pigment epithelial cells

Brian Y. Ishida^*, Kathy R. Bailey, Keith G. Duncan, Robert J. Chalkley, A. L. Burlingame, John P. Kane^* and Daniel M. Schwartz^1,,**

^* Cardiovascular Research Institute, University of California, San Francisco, CA
Department of Ophthalmology, University of California, San Francisco, CA
Mass Spectrometry Facility, Department of Pharmaceutical Chemistry, University of California, San Francisco, CA
^** Veterans Affairs Medical Center, San Francisco, CA

¹ To whom correspondence should be addressed. e-mail: schwartz7{at}mindspring.com

In early age-related macular degeneration (AMD), lipid-containing deposits (drusen) accumulate in Bruch's membrane underlying the retinal pigment epithelium (RPE). Recent studies indicate that apolipoprotein E (apoE) may play a role in lipid trafficking in AMD. Compared with the apoE3 allele, the apoE4 and apoE2 alleles are associated with decreased and increased risk for AMD, respectively; drusen contain high levels of apoE, and apoE null mice develop lipid deposits in Bruch's membrane similar to those observed in AMD. Primary cultures of human RPE cells expressing the apoE3 allele were grown on Transwell^® culture plates. Western blotting, ELISA assay, and mass spectrometry confirmed that apoE3 was secreted into the apical and basal chambers and that secretion was upregulated by thyroid hormone, 9-cis-retinoic acid, and 22(R)-hydroxycholesterol. In addition, basally secreted apoE associated with exogenously added HDL.

These results indicate that apoE secretion can be regulated by specific hormones and that apoE associates with HDL. The findings are consistent with a role for apoE in lipid trafficking through Bruch's membrane and may be relevant to AMD.

Abbreviations: AMD, age-related macular degeneration; HC, 22(R)-hydroxycholesterol; LXR, liver X receptor; POS, photoreceptor outer segment; RA, 9-cis-retinoic acid; RPE, retinal pigment epithelium; RXR, retinoid X receptor; T₃, thyroid hormone (3,3',5-triiodothyronine); TR, thyroid hormone receptor

Supplementary key words age-related macular degeneration • Bruch's membrane • retina • high density lipoprotein • thyroid hormone

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