Record Display for the EPA National Library Catalog


Main Title Acute, Subchronic, and Chronic Exposure to a Simulated Urban Profile of Ozone: Effects on Extrapulmonary Natural Killer Cell Activity and Lymphocyte Mitogenic Responses.
Author Selgrade, M. K. ; Daniels, M. J. ; Grose, E. C. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. Environmental Toxicology Div.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/328;
Stock Number PB91-149740
Additional Subjects Ozone ; Natural killer cells ; T lymphocytes ; Mitogens ; Rats ; Dose-response relationships ; Spleen ; Histology ; Lymph nodes ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB91-149740 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
Rats were exposed for 1,3,13,52 or 78 wk to air or a simulated urban profile of O3 designed to mimic diurnal exposure patterns frequently seen in worst case summer environments. Daily exposures consisted of a background level of 0.06 ppm for a period of 13 h, a broad exposure spike rising from 0.06 ppm to 0.25 ppm and returning to 0.06 ppm over 9 h and a 2 h downtime. Integration of the spike portion of the exposure pattern was equivalent to a 9 h square wave of 0.19 ppm. Rats were exposed to the profile 5 days/wk; weekend exposures were to background levels only. Spleens were removed and blood was drawn at the end of the exposure periods. O3 exposure had no effect on NKC activity, nor were any O3-related changes in mitogen responses or histopathology noted. Spleen cell mitogen responses, but not NKC activity, were significantly depressed, presumeably as a result of age, following the 52 and 78 wk exposures. Effects of age were apparent in the PBL responses to mitogens following the 13 wk as well as the 52 and 78 wk exposures. For comparative purposes, effects of a single, 3 h, exposure to 1 ppm O3 on spleen cell responses to the same mitogens were also determined 24, 48, and 72 h after exposure; there were also no effects due to the acute exposure.