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Open Access Research article

Proteasome inhibitors: Their effects on arachidonic acid release from cells in culture and arachidonic acid metabolism in rat liver cells

Lawrence Levine

Author Affiliations

Department of Biochemistry, Brandeis University Waltham, MA 02454, USA

BMC Pharmacology 2004, 4:15  doi:10.1186/1471-2210-4-15

Published: 5 August 2004

Abstract

Background

I have postulated that arachidonic acid release from rat liver cells is associated with cancer chemoprevention. Since it has been reported that inhibition of proteasome activities may prevent cancer, the effects of proteasome inhibitors on arachidonic acid release from cells and on prostaglandin I2 production in rat liver cells were studied.

Results

The proteasome inhibitors, epoxomicin, lactacystin and carbobenzoxy-leucyl-leucyl-leucinal, stimulate the release of arachidonic acid from rat glial, human colon carcinoma, human breast carcinoma and the rat liver cells. They also stimulate basal and induced prostacycin production in the rat liver cells. The stimulated arachidonic acid release and basal prostaglandin I2 production in rat liver cells is inhibited by actinomycin D.

Conclusions

Stimulation of arachidonic acid release and arachidonic acid metabolism may be associated with some of the biologic effects observed after proteasome inhibition, e.g. prevention of tumor growth, induction of apoptosis, stimulation of bone formation.