The Journal of Experimental Medicine
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Published online 10 July 2000.
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© The Rockefeller University Press, 0022-1007/2000/7/159/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 2, July 17, 2000 159-170


Original Article

Metabolic Consequences of Adenosine Deaminase Deficiency in Mice Are Associated with Defects in Alveogenesis, Pulmonary Inflammation, and Airway Obstruction

Michael R. Blackburna, Jonathan B. Volmera, Janci L. Thrashera, Hongyan Zhonga, Jeff R. Crosbyb, James J. Leeb, and Rodney E. Kellemsa
a Department of Biochemistry and Molecular Biology, University of Texas Health Science Center at Houston Medical School, Houston, Texas 77030
b Department of Biochemistry and Molecular Biology, Mayo Clinic, Scottsdale, Arizona 85259

Correspondence to: Michael R. Blackburn, University of Texas Health Science Center at Houston Medical School, Department of Biochemistry and Molecular Biology, 6431 Fannin St., Houston, TX 77030. Tel:713-500-6087 Fax:713-500-0652 E-mail:michael.r.blackburn{at}uth.tmc.edu.

Adenosine deaminase (ADA) is a purine catabolic enzyme that manages levels of the biologically active purines adenosine and 2'-deoxyadenosine in tissues and cells. ADA-deficient mice die at 3 wk of age from severe respiratory distress. This phenotype is progressive and is linked to perturbations in pulmonary purine metabolism. The inflammatory changes found in the lungs of ADA-deficient mice included an accumulation of activated alveolar macrophages and eosinophils. These changes were accompanied by a pronounced enlargement of alveolar spaces and increases in mucus production in the bronchial airways. The alveolar enlargement was found to be due in part to abnormal alveogenesis. Lowering adenosine and 2'-deoxyadenosine levels using ADA enzyme therapy decreased the pulmonary eosinophilia and resolved many of the lung histopathologies. In addition, genetically restoring ADA to the forestomach of otherwise ADA-deficient mice prevented adenine metabolic disturbances as well as lung inflammation and damage. These data suggest that disturbances in purinergic signaling mediate the lung inflammation and damage seen in ADA-deficient mice.

Key Words: eosinophil, asthma, emphysema, alveolar macrophage, adenosine deaminase


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