27-Hydroxycholesterol and 7alpha-hydroxycholesterol trigger a sequence of events leading to migration of CCR5-expressing Th1 lymphocytes
- 주제(키워드) Chemokines , Migration , Cholesterol oxides (oxysterols) , Th1 lymphocytes
- 등재 SCIE, SCOPUS
- 발행기관 ACADEMIC PRESS INC ELSEVIER SCIENCE
- 발행년도 2014
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000091258
- 본문언어 영어
- Published As http://dx.doi.org/10.1016/j.taap.2013.12.007
초록/요약
Th1 lymphocytes are predominant in atherosclerotic lesions. However, mechanisms involved in the Th1 predominance are unknown. We have investigated the possibility of Th1 lymphocyte recruitment in a cholesterol-rich milieu. A high cholesterol diet resulted in enhanced expression of CCR5 ligands, including CCL3 and CCL4, but not of proatherogenic CXCR3 ligands, in atherosclerotic arteries of ApoE(-/-) mice. 27-Hydroxycholesterol and 7 alpha-hydroxycholesterol, cholesterol oxides (oxysterols) detected in abundance in atherosclerotic lesions, greatly induced the transcription of CCL3 and CCL4 genes in addition to enhancing secretion of corresponding proteins by THP-1 monocytic cells. However, an identical or even higher concentration of cholesterol, 7 beta-hydroxycholesterol, and 7-ketocholsterol did not influence expression of these chemokines. Conditioned media containing the CCR5 ligands secreted from THP-1 cells induced migration of Jurkat T cells expressing CCR5, a characteristic chemokine receptor of Th1 cells, but not of Jurkat T cells that do not express CCR5. The migration of CCR5-expressing Jurkat T cells was abrogated in the presence of a CCR5-neutralizing antibody. 27-Hydroxycholesterol and 7 alpha-hydroxycholesterol enhanced phosphorylation of Akt. Pharmacological inhibitors of phosphoinositide-3-kinase/Akt pathways blocked transcription as well as secretion of CCL3 and CCL4 in conjunction with attenuated migration of CCR5-expressing Jurkat T cells. This is the first report on the involvement of cholesterol oxides in migration of distinct subtype of T cells. We propose that 27-hydroxycholesterol and 7 alpha-hydroxycholesterol can trigger a sequence of events that leads to recruitment of Th1 lymphocytes and phosphoinositide-3-kinase/Akt pathways play a major role in the process. (C) 2013 Elsevier Inc. All rights reserved.
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