Journal Article

Differential Pulmonary Retention of Diesel Exhaust Particles in Wistar Kyoto and Spontaneously Hypertensive Rats

Rajiv K. Saxena, M. Ian Gilmour, Mette C. Schladweiler, Michael McClure, Michael Hays and Urmila P. Kodavanti

in Toxicological Sciences

Volume 111, issue 2, pages 392-401
Published in print October 2009 | ISSN: 1096-6080
Published online July 2009 | e-ISSN: 1096-0929 | DOI: http://dx.doi.org/10.1093/toxsci/kfp164
Differential Pulmonary Retention of Diesel Exhaust Particles in Wistar Kyoto and Spontaneously Hypertensive Rats

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Spontaneously hypertensive (SH) and normotensive Wistar Kyoto (WKY) rats have been used for understanding the mechanisms of variations in susceptibility to airborne pollutants. We examined the lung burden of diesel exhaust particles (DEP) following inhalation of diesel engine exhaust (DEE) in both strains. The kinetics of clearance was also examined after single intratracheal (IT) instillation of DEP. Lungs were analyzed for DEP elemental carbon (EC) after exposure to DEE (0, 500, or 2000 μg/m3 4 h/day, 5 days/week × 4 weeks). SH rats had 16% less DEP-EC at 500 and 32% less at 2000 μg/m3 in the lungs, despite having 50% higher than the average minute volume. No strain-related differences were noted in number of alveolar macrophages or their average DEP load as evident from examining cells in bronchoalveolar lavage fluid (BALF). The kinetics of DEP clearance from lungs of male WKY and SH rats was studied following a single instillation at 0.0 or 8.33 mg/kg of DEP standard reference material (SRM 2975) from the National Institute of Standards Technology. SH rats cleared 60% DEP over 112 days while minimal clearance occurred from the lungs of WKY. The pattern of DEP-induced inflammatory response assessed by BALF analysis was similar in both strains, although the overall protein leak was slightly greater in SH rats. A time-dependent accumulation of DEP occurred in tracheal lymph nodes of both strains (SH > WKY). Thus, SH rats may clear DEP more efficiently from their lungs than normotensive WKY rats, with a small contribution of more effective lymphatic drainage.

Keywords: diesel exhaust particles; lung clearance; Wistar Kyoto rats; spontaneously hypertensive rats; hypertension; lymph nodes; lymphatic drainage

Journal Article.  6693 words.  Illustrated.

Subjects: Medical Toxicology ; Toxicology (Non-medical)

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