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Action of transcription factors in the control of transferrin receptor expression in human brain endothelium

Holloway, Karen; Sade, Hadassah; Romero, Ignacio A. and Male, David (2007). Action of transcription factors in the control of transferrin receptor expression in human brain endothelium. Journal of Molecular Biology, 365(5) pp. 1271–1284.

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URL: http://www.elsevier.com/wps/find/journaldescriptio...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/j.jmb.2006.10.071
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Abstract

Brain endothelium has a distinctive phenotype, including high expression of transferrin receptor, p-glycoprotein, claudin-5 and occludin. Dermal endothelium expresses lower levels of the transferrin receptor and it is absent from lung endothelium. All three endothelia were screened for transcription factors that bind the transferrin receptor promoter and show different patterns of binding between the endothelia. The transcription factor YY1 has distinct DNA-binding activities in brain endothelium and non-brain endothelium. The target-sites on the transferrin receptor promotor for YY1 lie in close proximity to those of the transcription initiation complex containing TFIID, so the two transcription factors potentially compete or interfere. Notably, the DNA-binding activity of TFIID was the converse of YY1, in different endothelia. YY1 knockdown reduced transferrin receptor expression in brain endothelium, but not in dermal endothelium implying that YY1 is involved in tissue-specific regulation of the transferrin receptor. Moreover a distinct YY1 variant is present in brain endothelium and it associates with Sp3. A model is presented, in which expression from the transferrin receptor gene in endothelium requires the activity of both TFIID and Sp3, but whether the gene is transcribed in different endothelia, is related to the balance between activating and suppressive forms of YY1.

Item Type: Journal Article
ISSN: 0022-2836
Extra Information: Published by Elsevier; URL leads to journal homepage.
Keywords: Brain endothelium; transcription factors; transferrin receptor; YY1; sp3
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Biomedical Research Network (BRN)
Innovation, Knowledge & Development research centre (IKD)
Item ID: 5944
Depositing User: David Male
Date Deposited: 11 Jan 2007
Last Modified: 08 Mar 2014 06:29
URI: http://oro.open.ac.uk/id/eprint/5944
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