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N-acetyl-beta-D-glucosaminidase activity within BAL from macaques exposed to generic coal dusts

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Abstract

N-acetyl-beta(β)-D-glucosaminidase is a lysosomal enzyme secreted by alveolar macrophages in response to phagocytosis of particulate material. Alveolar macrophages participate in the degradation and fibrosis of pulmonary tissue that results in pneumoconiosis. Known quantities of four characterized respirable dusts were bronchoscopically placed into the right caudal lung lobe of macaque monkeys. Bronchoalveolar lavage (BAL) samples were collected from dust-exposed right lung and unexposed left lung of the same individuals at 2-week intervals for 12 weeks after dust instillation. The samples were tested for N-acetyl-β-D-glucosaminidase activity to determine if the enzyme levels could serve as an indicator of pulmonary injury induced by generic coal dusts when compared to known fibrogenic and nuisance dusts. Installation of generic quartz, anthracite, or TiO2 dusts produced significant elevations of enzyme activity and increased numbers of macrophages in the dust-exposed lobes. Elevations in enzymatic activity and macrophage numbers were greatest in response to generic quartz dust. These results suggest that quantitative levels of N-acetyl-β-D-glucosaminidase activity may be a useful indicator of acute and chronic lung injury following exposure to fibrogenic and nonfibrogenic dusts.

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Authors and Affiliations

  1. Tulane Regional Primate Research Center, 18703 Three Rivers Rd., 70433, Covington, LA, USA

    P. A. Mack

  2. Department of Comparative Medicine, Milton S. Hershey Medical Center, Pennsylvania State University, P.O. Box 850, 17033, Hershey, PA, USA

    J. W. Griffith, S. Riling & C. M. Lang

Authors
  1. P. A. Mack
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  2. J. W. Griffith
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  3. S. Riling
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  4. C. M. Lang
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Mack, P.A., Griffith, J.W., Riling, S. et al. N-acetyl-beta-D-glucosaminidase activity within BAL from macaques exposed to generic coal dusts. Lung 173, 1–11 (1995). https://doi.org/10.1007/BF00167596

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