Abstract:Diesel exhaust particles (DEP) have been shown to alter pulmonary immune responses to bacterial infection. Exposure of rats to 100 mg/m(3) DEP for 4 h was found to aggravate Listeria monocytogenes(Listeria) infection at 3 days postinfection, but the bacteria were largely cleared at 7 days postinfection due to the development of a strong T cell-mediated immunity. In the present study, we examined the effects of repeated DEP exposure at lower doses on pulmonary responses to bacterial infection. Brown Norway rats… Show more
“…17 Repeated low-dose DEP exposure resulted in downregulation of T cell-mediated immune responses, whereas a single high-dose exposure to DEPs aggravated bacterial infection and triggered strong T cell-mediated immunity, indicating that DEPs can also alter pulmonary immune responses to bacterial infection. 31 Individuals with gene variants for phase II detoxifying enzymes (glutathione-s-transferase P1 and M1), causing the absence or reduced production of these enzymes, have been demonstrated to have increased susceptibility …”
“…17 Repeated low-dose DEP exposure resulted in downregulation of T cell-mediated immune responses, whereas a single high-dose exposure to DEPs aggravated bacterial infection and triggered strong T cell-mediated immunity, indicating that DEPs can also alter pulmonary immune responses to bacterial infection. 31 Individuals with gene variants for phase II detoxifying enzymes (glutathione-s-transferase P1 and M1), causing the absence or reduced production of these enzymes, have been demonstrated to have increased susceptibility …”
“…However, a study conducted in Chile by Ruiz et al (42) found no association between ambient air pollution and the humoral immune system in children. Emerging evidence from animal toxicological studies suggest that ambient air pollution may cause suppression of host immunity (43,44).…”
“…Although other inflammatory disorders, such as chronic alcoholism 5 and particulate matter inhalation, 6 have been linked with AM dysfunction, AM function has not been extensively evaluated in asthma. Recently, increased AM activation and decreased phagocytosis of apoptotic cells were reported in asthmatic adults.…”
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