Susceptibility of adult and senescent Brown Norway rats to repeated ozone exposure: an assessment of behavior, serum biochemistry and cardiopulmonary function.

Gordon CJ, Jarema KA, Lehmann JR, Ledbetter AD, Schladweiler MC, Schmid JE, Ward WO, Kodavanti UP, Nyska A, MacPhail RC.
Journal   Inhal Toxicol
Species  
Analytes Measured   A2M , Adiponectin , AGP , Insulin , Leptin , Osteopontin
Matrix Tested   Serum
Year   2013
Volume   25
Page Numbers   141-159
Application   Toxicology
Abstract
Ozone (O₃) is a pervasive air pollutant that produces pulmonary and cardiovascular dysfunction and possible neurological dysfunction. Young and old individuals are recognized as being susceptible to O₃; however, remarkably little is known about susceptibility with senescence. This study explored the pulmonary, cardiovascular and neurological effects of O₃ exposure in adult (4 m) and senescent (20 m) Brown Norway rats exposed to 0 or 0.8 ppm O₃ for 6 h, 1 d/week, for 17 weeks. Ventilatory function was assessed 1 and 7 d after each exposure (Buxco). Heart rate, blood pressure (tail cuff) and motor activity were measured biweekly. Blood, aorta and bronchoalveolar lavage fluid (BALF) were analyzed 24 h after the last exposure for pulmonary inflammation, serum biomarkers and aorta mRNA markers of vascular disease. Measures of normal ventilatory function declined following each O₃ exposure in both adult and senescent rats, however, senescent rats took weeks to exhibit a decline. Evidence for residual respiratory effects of O₃ 7 d after exposure in both age groups was observed. O₃ had no effect on either heart rate or blood pressure, but decreased motor activity in both age groups. BALF indicated mild neutrophilic inflammation and protein leakage in adults. Age affected 17/58 serum analytes, O₃ affected 6/58; 2/58 showed an age-O₃ interaction. Leptin, adiponectin, lipocalin and insulin were increased in senescent rats. Overall, adult rats exhibited more immediate effects of episodic O₃ than senescent rats. Residual effects were, however, obtained in both ages of rat, especially for ventilatory endpoints.

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