Three new 5-lipoxygenase inhibitors, designated as BU-4601 A, B and C, were found in the fermentation broth of Streptomyces sp. strain No. AA2807. Their structures were identified as isodecyl, isoundecyl and isolauryl esters of 5-hydroxyanthranilic acid, respectively. Based on their structures, five related esters were synthesized and evaluated for biological activity as inhibitors of 5-lipoxyg...

Biochemical and genetic evidence support the involvement of leukocyte-type 12/15-lipoxygenase enzyme and its products in the atherogenic process. We recently showed that products of the 12/15-lipoxygenase pathway play an important role in mediating hypertrophy, matrix protein production, and inflammatory gene expression in vascular smooth muscle cells (VSMC) through activation of mitogen activa...

Previously, we isolated the murine "leukocyte-type" 12-lipoxygenase (L-12LO) cDNA from RNA of peritoneal-elicited cells that consisted predominantly of leukocytes (Chen, X.-S., Kurre, U., Jenkins, N. A., Copeland, N. G., and Funk, C. D. (1994) J. Biol. Chem. 269, 13979-13987). By in situ hybridization we show that the L-12LO gene is expressed abundantly in a subset of peritoneal macrophages but...

5-lipoxygenase is an enzyme responsible for the synthesis of a range of bioactive lipids signalling molecules known collectively as eicosanoids. 5-lipoxygenase metabolites such as 5-hydroxyeicosatetraenoic acid (5-HETE) and a number of leukotrienes are mostly derived from arachidonic acid and have been shown to be lipid mediators of inflammation in different pathological states including cancer...

Received October 5, 1970 SUMMARY Lipoxygenase (E.C. 1.99.2.1) from soybean catalyzes its own destruction in the presence of both substrates, oxygen and fatty acid. The apparent first order rate constant for this inactivation was 0.050 min-1 in the presence of 9,12-octadecadienoate and 0.32 min-1 with 5,8,11,14-eicosatetraenoate. Lipoxygenase is a dioxygenase capable of stereospecific attack (1)...

We examined the possibility that renal glomerular and cortical tubular tissue has lipoxygenase activity in addition to the well established cyclo-oxygenase pathway of arachidonic acid metabolism. Homogenized rat kidney glomeruli, in the presence of meclofenamate (33 PM) and divalent cation ionophore A23187 (3 PM), metabolized octatritiated arachidonic acid to 12-hydroxyeicosatetraenoic acid and...

BACKGROUND Many studies suggest that the Gln261Arg polymorphism in 12-lipoxygenase gene is assicated with cancer susceptibility, but the results are inconclusive. This meta-analysis aimed to investigate the overall association between the Gln261Arg polymorphism in 12-lipoxygenase gene and cancer risk. METHODS Literature search was performed in Pubmed, Embase and other databases for studies ev...

The role of mitogen-activated protein kinase signaling and the transcription factor c-Jun in epidermal growth factor (EGF)-induced expression of 12-lipoxygenase in human epidermoid carcinoma A431 cells was studied. EGF increased the activation of extracellular signal-regulated kinase (ERK) and c-Jun amino terminal kinase (JNK) in a time-dependent manner. Treatment of the cells with an mitogen-a...

In this study, we focused to identify whether eupatilin (5,7-dihydroxy-3',4',6-trimethoxyflavone), an extract from Artemisia argyi folium, prevents H(2)O(2)-induced injury of cultured feline esophageal epithelial cells. Cell viability was measured by the conventional MTT reduction assay. Western blot analysis was performed to investigate the expression of 5-lipoxygenase by H(2)O(2) treatment in...

Platelet lipoxygenase and cyclo-oxygenase pathways were investigated by the incubation of 1(-14) C-arachidonic acid with washed platelets in 33 patients with myeloproliferative disorders, including 14 patients with chronic myeloid leukemia (CML), 12 with polycythemia vera (PV), 4 with essential thrombocythemia (ET), and 3 with myelofibrosis (MF). In patients with MF and CML, mean activities of ...