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Pathobiochemical response of tracheobronchial lymph nodes following intratracheal instillation of Polyvinylchloride dust in rats

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Abstract

PVC dust, following a single intratracheal instillation (25 mg/rat), was substantially cleared through the lymphatic circulation and progressively accumulated in the tracheobronchial lymph nodes (TBLN) in a time-dependent manner for up to 1 year. The tissue response in TBLN during 60–270 days post-instillation of PVC dust was characterized by progressive increase in total organ fresh weight, dry weight, DNA, RNA and protein contents, concurrent with the proliferation of macrophages and hyperplasia of reticular cells. Active phagocytosis and enhanced hydrolytic activity in TBLN was evident around 270 days post-instillation by the appearance of PVC-laden macrophages near and within the dust foci, and increased activity of acid phosphatase, DNAse, RNAse and β-glucuronidase. PVC dust caused degeneration of macrophages, and consequent release of hydrolytic enzymes resulted in limited cytotoxicity without inducing reticulination and fibrosis in the TBLN. The histology and clinical biochemistry of liver, kidney, spleen and serum were not altered and there were no detectable PVC particles in these tissues at up to 365 days. It is therefore concluded that lymphatic clearance of intratracheally instilled PVC dust results in its accumulation and mild foreign body reaction in TBLN which is non-fibrogenic at up to 365 days post-instillation.

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Authors and Affiliations

  1. Industrial Toxicology Research Centre, M. G. Marg, Post Box 80, 226 001, Lucknow, India

    Deepak K. Agarwal, R. K. S. Dogra & Ravi Shanker

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  1. Deepak K. Agarwal
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  2. R. K. S. Dogra
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  3. Ravi Shanker
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Agarwal, D.K., Dogra, R.K.S. & Shanker, R. Pathobiochemical response of tracheobronchial lymph nodes following intratracheal instillation of Polyvinylchloride dust in rats. Arch Toxicol 65, 510–517 (1991). https://doi.org/10.1007/BF01977366

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  • DOI: https://doi.org/10.1007/BF01977366

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