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Suppression of receptor-mediated Ca2+ mobilization and functional leukocyte responses by hyperforin.

Abstract：

:We have recently identified hyperforin, a lipophilic constituent of the herb Hypericum perforatum (St. John's wort), as a dual inhibitor of the proinflammatory enzymes cyclooxygenase-1 and 5-lipoxygenase. The aim of the present study was to further elucidate antiinflammatory properties and respective targets of hyperforin. We found that hyperforin inhibited the generation of reactive oxygen species (ROS) as well as the release of leukocyte elastase (degranulation) in human isolated polymorphonuclear leukocytes (PMNL), challenged by the G protein-coupled receptor (GPCR) ligand N-formyl-methionyl-leucyl-phenylalanine (fMLP) with an IC 50 approximately equal 0.3 microM. When PMNL were stimulated with phorbol-12-myristate-13-acetate (PMA) or ionomycin, hyperforin (up to 10 microM) failed to inhibit ROS production and elastase release, respectively. Moreover, hyperforin blocked receptor-mediated Ca(2+) mobilization ( IC 50 approximately equal 0.4 and 4 microM, respectively) in PMNL and monocytic cells, and caused a rapid decline of the intracellular Ca(2+) concentration in resting cells. In contrast, the Ca(2+) influx induced by ionomycin or thapsigargin was not suppressed. Comparative studies with the specific phospholipase C inhibitor U-73122 and hyperforin revealed similarities between both compounds. Thus, U-73122 and hyperforin blocked fMLP- and PAF-induced Ca(2+) mobilization, ROS formation, and elastase release, but failed to suppress these responses when cells were stimulated by PMA or ionomycin. Also, both compounds rapidly decreased basal Ca(2+) levels in resting cells and led to a rapid decline of the Ca(2+) elevations evoked by fMLP or PAF. Our data suggest that hyperforin targets component(s) within G protein signaling cascades that regulate Ca(2+) homeostasis, coupled to proinflammatory leukocyte functions.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Feisst C,Werz O

doi

10.1016/j.bcp.2003.12.020

subject

Has Abstract

pub_date

2004-04-15 00:00:00

pages

1531-9

issue

8

eissn

0006-2952

issn

1873-2968

pii

S000629520300964X

journal_volume

67

pub_type

杂志文章

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