PT  - JOURNAL ARTICLE
AU  - Haskó, György
AU  - Deitch, Edwin A.
AU  - Németh, Zoltán H.
AU  - Kuhel, David G.
AU  - Szabó, Csaba
TI  - Inhibitors of ATP-Binding Cassette Transporters Suppress Interleukin-12 p40 Production and Major Histocompatibility Complex II Up-Regulation in Macrophages
AID  - 10.1124/jpet.301.1.103
DP  - 2002 Apr 01
TA  - Journal of Pharmacology and Experimental Therapeutics
PG  - 103--110
VI  - 301
IP  - 1
4099  - http://jpet.aspetjournals.org/content/301/1/103.short
4100  - http://jpet.aspetjournals.org/content/301/1/103.full
SO  - J Pharmacol Exp Ther2002 Apr 01; 301
AB  - ATP-binding cassette (ABC) transporters are a large family of proteins whose role is to translocate various substances across biological membranes. They include the Tangier disease protein ABC1, sulfonylurea receptors (SUR), multidrug resistance protein (MDR), and cystic fibrosis transmembrane regulator (CFTR). In the current study, we investigated the involvement of ABC transporters in the regulation of lipopolysaccharide (LPS) and/or interferon (IFN)-γ-induced interleukin (IL)-12 p40 and tumor necrosis factor (TNF)-α production, nitric oxide formation, as well as major histocompatibility complex II up-regulation in macrophages. The general ABC transporter inhibitor glibenclamide suppressed both IL-12 p40 and nitric oxide production. However, glibenclamide failed to affect the production of TNF-α. The selective ABC1 inhibitors 4,4′-diisothiocyanostilbene-2,2′-disulfonic acid and sulfobromophthalein mimicked the suppressive effect of glibenclamide on IL-12 p40 production. On the other hand, both the MDR inhibitor verapamil and CFTR blocker 2,2′-iminodibenzoic acid failed to suppress the production of IL-12 p40. Furthermore, selective inhibitors and activators of SURs were without effect. In agreement with the pharmacological data, macrophages expressed mRNA for ABC1, but not SURs or CFTR. Intracellular levels of IL-12 p40 were decreased by glibenclamide, suggesting that glibenclamide does not affect IL-12 p40 secretion. The effect of glibenclamide did not involve an interference with the activation of the p38 and p42/44 mitogen-activated protein kinases or c-Jun kinase. Glibenclamide also suppressed IFN-γ-induced up-regulation of major histocompatibility complex II. Taken together, our results indicate that ABC proteins regulate LPS and/or IFN-γ-induced macrophage activation. The American Society for Pharmacology and Experimental Therapeutics