Adenovirus-mediated transfer of a gene encoding acyloxyacyl hydrolase (AOAH) into mice increases tissue and plasma AOAH activity

M. G. Coulthard, J. Swindle, R. S. Munford, R. D. Gerard, R. S. Meidell

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Although the host response to gram-negative bacterial infection follows largely from the interactions of bacterial lipopolysaccharides (LPS or endotoxin) with host cells, little information is available concerning the mechanisms by which the host eliminates or detoxifies LPS. Acyloxyacyl hydrolase (AOAH) is an enzyme, found in phagocytic cells, that catalyzes the enzymatic deacylation of the lipid A moiety of LPS. Enzymatically deacylated LPS is much less potent than LPS at inducing responses in human cells, and it can antagonize the ability of LPS to activate human macrophages, neutrophils, and endothelial cells. Despite these observations, the physiologic role of LPS deacylation remains undefined. To investigate the ability of AOAH to carry out LPS deacylation in vivo, we produced a recombinant adenovirus carrying a gene encoding AOAH (Ad.CMV-AOAH) and employed this vector to elicit transient overexpression of AOAH in mice. Mice infected with Ad.CMV- AOAH expressed high levels of the enzyme in plasma, liver, spleen, and kidney. Although adenovirus-induced hepatitis reduced hepatic uptake of intravenously injected [3H]LPS, animals expressing the transgene deacylated a larger fraction of the [3H]LPS taken up by their livers than did mice infected with a control adenovirus. These studies indicate that AOAH can catalyze the deacylation of LPS in vivo, and they provide evidence that the rates of hepatic LPS uptake and deacylation are not closely linked.

Original languageEnglish (US)
Pages (from-to)1510-1515
Number of pages6
JournalInfection and Immunity
Volume64
Issue number5
StatePublished - 1996

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Adenoviridae
Genes
Liver
Gram-Negative Bacterial Infections
Lipid A
Enzymes
Phagocytes
acyloxyacyl hydrolase
Transgenes
Endotoxins
Hepatitis
Lipopolysaccharides
Neutrophils
Spleen
Endothelial Cells
Macrophages
Kidney

ASJC Scopus subject areas

  • Immunology

Cite this

Coulthard, M. G., Swindle, J., Munford, R. S., Gerard, R. D., & Meidell, R. S. (1996). Adenovirus-mediated transfer of a gene encoding acyloxyacyl hydrolase (AOAH) into mice increases tissue and plasma AOAH activity. Infection and Immunity, 64(5), 1510-1515.

Adenovirus-mediated transfer of a gene encoding acyloxyacyl hydrolase (AOAH) into mice increases tissue and plasma AOAH activity. / Coulthard, M. G.; Swindle, J.; Munford, R. S.; Gerard, R. D.; Meidell, R. S.

In: Infection and Immunity, Vol. 64, No. 5, 1996, p. 1510-1515.

Research output: Contribution to journalArticle

Coulthard, MG, Swindle, J, Munford, RS, Gerard, RD & Meidell, RS 1996, 'Adenovirus-mediated transfer of a gene encoding acyloxyacyl hydrolase (AOAH) into mice increases tissue and plasma AOAH activity', Infection and Immunity, vol. 64, no. 5, pp. 1510-1515.
Coulthard, M. G. ; Swindle, J. ; Munford, R. S. ; Gerard, R. D. ; Meidell, R. S. / Adenovirus-mediated transfer of a gene encoding acyloxyacyl hydrolase (AOAH) into mice increases tissue and plasma AOAH activity. In: Infection and Immunity. 1996 ; Vol. 64, No. 5. pp. 1510-1515.
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