Transcription Suppression of Thromboxane Receptor Gene Expression by Retinoids in Vascular Smooth Muscle Cells

• URUNO Akira

  Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine

• SUGAWARA Akira

  Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine

• KUDO Masataka

  Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine

• SATO Mayumi

  Medical Research and Development Center, Tokyo Metropolitan Institute for Medical Science

• SATO Kazunori

  Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine

• ITO Sadayoshi

  Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine

• TAKEUCHI Kazuhisa

  Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine

抄録

Thromboxane (TX) A₂ induces contraction and proliferation of vascular smooth muscle cells (VSMCs) via its specific membrane TX receptor (TXR), possibly leading to the progression of atherosclerosis. Retinoids, derivatives of vitamin A, have recently been shown to be anti-atherosclerotic in VSMCs. We therefore examined the effects of retinoids on TX-induced cell growth and TXR expression in VSMCs. TX-induced VSMC proliferation assessed by ³H-thymidine incorporation was completely abrogated by all-trans retinoic acid (ATRA) treatment. The expression of TXR mRNA was significantly decreased by treatment either with ATRA or its stereoisomer 9-cis retinoic acid (RA). Transcription activity of the TXR gene promoter was suppressed by treatment with these retinoids, and a study using retinoid receptor-selective agonists demonstrated that retinoic acid receptors (RARs), rather than retinoid X receptors (RXRs), were mainly involved in the transcription suppression. Deletion analyses demonstrated that the suppression was mediated via the -22/-7 GC-box related sequence. Electrophoretic mobility shift assays showed that Sp1, but not RAR and/or RXR, could bind to the element. The formation of the Sp1-DNA complex was inhibited by co-incubation with RAR, but not by RXR. Taken together, these findings suggest that TXR gene transcription suppression may be mediated by the inhibition of Sp1 binding to the -22/-7 GC-box related sequence by activated RAR, which may result in the inhibition of TX-induced VSMC proliferation. Our study indicates a novel anti-atherosclerotic action of retinoids in VSMCs. (Hypertens Res 2003; 26: 815-821)

収録刊行物

• Hypertension Research

  Hypertension Research 26 (10), 815-821, 2003

  日本高血圧学会

キーワード

• <B>retinoid</B>
• <B>retinoic acid receptor</B>
• <B>retinoid X receptor</B>
• <B>all-<I>trans</I> retinoic acid</B>
• <B>9-<I>cis</I> retinoic acid</B>

詳細情報

• CRID: 1390001204720939648
• NII論文ID: 10012457647
• NII書誌ID: AA10847079
• DOI: 10.1291/hypres.26.815
• COI: 1:CAS:528:DC%2BD2cXis1KhsQ%3D%3D
• ISSN: 13484214
• ISSN: 09169636
• PubMed: 14621185
• Web Site: https://search.jamas.or.jp/link/ui/2004089321
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • PubMed
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可