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In situ amplification of 5-lipoxygenase and 5-lipoxygenase-activating protein in allergic airway inflammation and inhibition by leukotriene blockade.

Authors: Chu, SJ  Tang, LO  Watney, E  Chi, EY  Henderson WR, JR 
Citation: Chu SJ, etal., J Immunol. 2000 Oct 15;165(8):4640-8.
Pubmed: (View Article at PubMed) PMID:11035107

Leukotrienes are important mediators of the eosinophilic influx and mucus hypersecretion in the lungs in a murine model of asthma. We used in situ PCR in this model of human asthma to detect lung mRNA for 5-lipoxygenase (5-LO) and 5-LO-activating protein (FLAP), key proteins necessary for leukotriene synthesis. Lung tissue was obtained on day 28 from mice treated with i.p. (days 0 and 14) and intranasal (days 14, 25, 26, and 27) OVA or saline. After fixation, the tissue sections underwent protease- and RNase-free DNase digestion, before in situ RT-PCR using target-specific cDNA amplification. 5-LO and FLAP-specific mRNA was visualized by a digoxigenin detection system, and positive cells were analyzed by morphometry. 5-LO and FLAP-specific mRNA and protein were associated primarily with eosinophils and alveolar macrophages in the airways and pulmonary blood vessels in OVA-sensitized/challenged mice. 5-LO and FLAP protein expression increased on a per-cell basis in alveolar macrophages of OVA-treated mice compared with saline controls. Pulmonary blood vessel endothelial cells were also positive for 5-LO, FLAP mRNA, and protein. 5-LO inhibition significantly decreased 5-LO and FLAP-specific mRNA and protein expression in the lung inflammatory cells and endothelial cells. These studies demonstrate a marked increase in key 5-LO pathway proteins in the allergic lung inflammatory response and an important immunomodulatory effect of leukotriene blockade to decrease 5-LO and FLAP gene expression.

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CRRD Object Information
CRRD ID: 4890422
Created: 2010-12-17
Species: All species
Last Modified: 2010-12-17
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.