Divergent action of calcium channel blockers on ATP-binding cassette protein expression

Kazuhiro Hasegawa, Shu Wakino, Takeshi Kanda, Kyoko Yoshioka, Satoru Tatematsu, Koichiro Homma, Ichiro Takamatsu, Naoki Sugano, Koichi Hayashi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Calcium channel blockers (CCBs) are widely used in clinical practice, and have been reported to be effective in preventing the progression of atherosclerosis. We examined whether various types of calcium channel blockers affected the expression of ATP binding cassette transporter A1 (ABCA1), a factor contributing to anti-atherogenesis. Undifferentiated monocytic cell line, THP-1 cells were maintained in RPMI 1640 medium and treated with different kinds of calcium channel blockers. Among the calcium channel blockers tested, aranidipine and efonidipine increased ABCA1 protein expression without an increase in ABCA1 mRNA expression, whereas other calcium channel blockers (eg, nifedipine, amlodipine, and nicardipine) or T-type calcium channel blockers (eg, mibefradil and nickel chloride) failed to upregulate ABCA1 expression. H89, a protein kinase A inhibitor inhibited the aranidipine-induced ABCA1 protein expression, whereas genistein (a tyrosine kinase inhibitor), or AG490 (a JAK-2 inhibitor) had no effects. Neither of these inhibitors suppressed the efonidipine-induced ABCA1 protein expression. Intracellular cAMP levels were elevated only by aranidipine, but not by efonidipine. In conclusion, aranidipine and efonidipine have the ability to induce ABCA1 protein by distinct mechanisms; protein kinase A is involved in the aranidipine-induced ABCA1 upregulation. This non-class effect of calcium channel blockers may potentially offer beneficial action in the treatment of hypertensive subjects with atherosclerosis.

Original languageEnglish
Pages (from-to)787-793
Number of pages7
JournalJournal of Cardiovascular Pharmacology
Volume46
Issue number6
DOIs
Publication statusPublished - 2005 Dec 1

Keywords

  • ABCA1
  • Aranidipine
  • Calcium channel blocker
  • Efonidipine
  • Protein kinase A
  • cAMP

ASJC Scopus subject areas

  • Pharmacology
  • Cardiology and Cardiovascular Medicine

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