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CYP26 inhibitor R115866 increases retinoid signaling in intimal smooth muscle cells
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences.
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2007 (English)In: Arteriosclerosis, Thrombosis and Vascular Biology, ISSN 1079-5642, E-ISSN 1524-4636, Vol. 27, no 7, 1542-1548 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVE: Intimal smooth muscle cells (SMCs) are dedifferentiated SMCs that have a powerful ability to proliferate and migrate. This cell-type is responsible for the development of intimal hyperplasia after vascular angioplasty. Retinoids, especially all-trans retinoid acid, are known to regulate many processes activated at sites of vascular injury, including modulation of SMC phenotype and inhibition of SMC proliferation. Intracellular levels of active retinoids are under firm control. A key enzyme is the all-trans retinoic acid-degrading enzyme cytochrome p450 isoform 26 (CYP26). Thus, an alternative approach to exogenous retinoid administration could be to increase the intracellular level of all-trans retinoic acid by blocking CYP26-mediated degradation of retinoids. METHODS AND RESULTS: Vascular intimal and medial SMCs expressed CYP26A1 and B1 mRNA. Although medial cells remained unaffected, treatment with the CYP26-inhibitor R115866 significantly increased cellular levels of all-trans retinoic acid in intimal SMCs. The increased levels of all-trans retinoic acid induced retinoid-regulated genes and decreased mitogenesis. CONCLUSIONS: Blocking of the CYP26-mediated catabolism mimics the effects of exogenously administrated active retinoids on intimal SMCs. Therefore, CYP26-inhibitors offer a potential new therapeutic approach to vascular proliferative disorders.

Place, publisher, year, edition, pages
2007. Vol. 27, no 7, 1542-1548 p.
Keyword [en]
retinoids, CYP26, retinoid metabolism, vascular smooth muscle cells
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-12277DOI: 10.1161/ATVBAHA.106.138602ISI: 000247401400008PubMedID: 17510468OAI: oai:DiVA.org:uu-12277DiVA: diva2:40046
Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2011-02-07Bibliographically approved

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