Induction of neutrophil Mac-1 integrin expression and superoxide production by the medicinal plant extract gossypol.

Abstract:

:Gossypol is present in antiinflammatory poultices made from the medicinal tree Thespesia populnea. Isolated human neutrophils exposed to 3-20 microM gossypol for 15-90 min were assayed in vitro for superoxide production and surface expression of Mac-1 (CD11b/CD18). Gossypol increased superoxide production in a time- and concentration-dependent fashion consistent with a moderate, delayed respiratory burst. Surface Mac-1 expression was increased within 15 min by 3-5 microM gossypol, resulting in a 14-fold increase over controls and a threefold greater increase over that produced by PMA. Staurosporine failed to block gossypol induction of superoxide and Mac-1, while EDTA inhibited induction of Mac-1 only, implicating a calcium-dependent mechanism. Gossypol increased intracellular calcium to peak levels, but in a delayed fashion as compared to FMLP. These findings demonstrate that gossypol is a highly potent stimulant of Mac-1 expression and suggest at least two protein kinase C-independent pathways of neutrophil activation. The resultant exhaustion of neutrophils may account for the antiinflammatory properties of plants containing gossypol.

journal_name

Inflammation

journal_title

Inflammation

authors

Benhaim P,Mathes SJ,Hunt TK,Scheuenstuhl H,Benz CC

doi

10.1007/BF01560692

subject

Has Abstract

pub_date

1994-10-01 00:00:00

pages

443-58

issue

5

eissn

0360-3997

issn

1573-2576

journal_volume

18

pub_type

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