Additive blockade of beta 2-integrin adhesion of eosinophils by salmeterol and fluticasone propionate.

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Myo S, Zhu X, Myou S, Meliton AY, Liu J, Boetticher E, Lambertino AT, Xu C, Munoz NM, Leff AR

Additive blockade of beta 2-integrin adhesion of eosinophils by salmeterol and fluticasone propionate.

Eur Respir J. 2004 Apr;23(4):511-7.

PubMed ID

15083746 [ View in PubMed

]

Abstract

Migration of human eosinophils is regulated by integrin expression, conformational change, and activation of cytosolic phospholipase A2 (cPLA2). Corticosteroids have been shown to inhibit cPLA2 hydrolysis in human eosinophils. The objective of this study was to determine the mechanisms of fluticasone propionate (FP) alone or in combination with salmeterol (SM) in blocking adhesion mediated by beta 2-integrin in human eosinophils. Human eosinophils were isolated by negative magnetic selection. beta 2-integrin-mediated eosinophil adhesion was measured by residual eosinophil peroxidase activity. Eosinophils were pretreated for 12 h to 24 h with FP and with or without SM for 30 min. Both SM alone and FP alone inhibited eosinophil adhesion in concentration- and time-dependent manner. SM alone modestly (approximately 30%) inhibited interleukin (IL)-5-induced eosinophil adhesion. Blockade of IL-5-induced eosinophil adhesion caused by 10(-7) M FP at 24 h was augmented by 10(-7) M SM from 41.5% to 72.5%. Similar blockade was also observed for eotaxin-induced eosinophil adhesion. Neither SM, FP, nor FP + SM blocked either: 1) upregulation of CD11b surface expression; or 2) phosphorylation of cPLA2. Blockade of beta 2-integrin-mediated eosinophil adhesion by fluticasone propionate is augmented by salmeterol. Decreased adhesion results from augmented blockade of nuclear translocation of cytosolic phospholipase A2 caused by addition of salmeterol to fluticasone.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Fluticasone	Cytosolic phospholipase A2	Protein	Humans	Unknown	Inhibitor	Details
Fluticasone propionate	Cytosolic phospholipase A2	Protein	Humans	Unknown	Inhibitor	Details