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. 1992 Oct 1;89(19):9044–9048. doi: 10.1073/pnas.89.19.9044

Differential expression of arachidonate 5-lipoxygenase transcripts in human brain tumors: evidence for the expression of a multitranscript family.

R J Boado 1, W M Pardridge 1, H V Vinters 1, K L Black 1
PMCID: PMC50061  PMID: 1357659

Abstract

In addition to the important role of leukotrienes as mediators in allergy and inflammation, these compounds are also linked to pathophysiological events in the brain including cerebral ischemia, brain edema, and increased permeability of the blood-brain barrier in brain tumors. Although brain tumors have been shown to secrete leukotrienes, no studies to date have provided evidence for the tumor expression of genes encoding enzymes involved in leukotriene production. Therefore, the present study determined the abundance of the mRNA for arachidonate 5-lipoxygenase (5-LO; arachidonate:oxygen 5-oxidoreductase, EC 1.13.11.34), which is the rate-limiting enzyme in leukotriene synthesis, in a series of human brain tumors. Macrophage/monocyte infiltration of the tumor was estimated by measuring the abundance of the transcript for the 91-kDa glycoprotein phagocyte-specific oxidase (gp91-phox), which is the phagocyte-specific cytochrome b heavy chain. The present study shows that (i) the 5-LO transcript is expressed in normal bovine brain and in human brain tumors; (ii) the 5-LO gene in human brain tumors and in the dimethyl sulfoxide-induced promyelocytic human leukemic HL-60 cells is expressed as a multitranscript family (2.7, 3.1, 4.8, 6.4, 8.6 kilobases); and (iii) the abundance of 5-LO transcripts, the expression of the larger transcripts, and the 5-LO/gp91-phox ratio correlate with the tumor malignancy. Overall, the present study supports the hypothesis that the 5-LO gene product may play a role in human tumor-induced brain edemas and provides evidence for tumor-associated expression of high molecular weight 5-LO transcripts in human brain tumors.

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Selected References

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