Silymarin Constituents Enhance ABCA1 Expression in THP-1 MacrophagesReport as inadecuate




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1

Department of Pharmacognosy, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria

2

Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402, USA





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Author to whom correspondence should be addressed.



Academic Editor: Milen I. Georgiev

Abstract Silymarin is a hepatoprotective mixture of flavonolignans and flavonoids extracted from the seeds of milk thistle Silybum marianum L. Gaertn. This study investigates the effect of major bioactive constituents from silymarin, silybin A, silybin B, isosilybin A, isosilybin B, silydianin, silychristin, isosilychristin, and taxifolin, on the expression of ABCA1, an important cholesterol efflux transporter, in THP-1-derived macrophages. Four of the studied compounds, isosilybin A, silybin B, silychristin and isosilychristin, were found to significantly induce ABCA1 protein expression without affecting cell viability. Moreover, isosilybin A, a partial PPARγ agonist, was found to promote cholesterol efflux from THP-1 macrophages in a concentration-dependent manner. These findings first show ABCA1 protein up-regulating activity of active constituents of silymarin and provide new avenues for their further study in the context of cardiovascular disease. View Full-Text

Keywords: ABCA1; silymarin; isosilybin A; cholesterol efflux; macrophages; flavonolignans ABCA1; silymarin; isosilybin A; cholesterol efflux; macrophages; flavonolignans





Author: Limei Wang 1, Susanne Rotter 1, Angela Ladurner 1, Elke H. Heiss 1, Nicholas H. Oberlies 2, Verena M. Dirsch 1 and Atanas G. Atanasov 1,*

Source: http://mdpi.com/



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