title: Lung function changes in mice sensitized to ammonium hexachloroplatinate.
abstract: Occupational exposure to halogenated platinum salts can trigger the development of asthma. The risk to the general population that may result from the use of platinum in catalytic converters and its emerging use as a diesel fuel additive is unclear. To investigate pulmonary responses to platinum, we developed a mouse model of platinum hypersensitivity. Mice were sensitized through application of ammonium hexachloroplatinate (AHCP) to the shaved back on days 0, 5 and 19, and to each ear on days 10, 11 and 12. On days 24 and 29, mice were challenged by oropharyngeal aspiration with AHCP in saline. Before and immediately after challenge, pulmonary responses were assessed using whole body plethysmography (WBP). A dose-dependent increase in immediate responses was observed in AHCP-sensitized and challenged mice. On days 26 and 31, changes in ventilatory responses to methacholine (Mch) aerosol were assessed by WBP; dose-dependent increases in Mch responsiveness occurred in sensitized mice. Lymph node cell counts indicate a proliferative response in lymph nodes draining the sites of application. Bronchoalveolar lavage fluid harvested from sensitized mice contained an average of 5% eosinophils compared to less than 0.5% in non-sensitized mice (p < 0.05); significant increases in total serum immunoglobulin E were observed for all sensitized mice. Although a second airway challenge on day 29 affected some results, only one airway challenge was needed to observe changes in lung function.
authors: a Cardiopulmonary and Immunotoxicology Branch, Environmental Public Health Division, National Health, and Environmental Effects Laboratory (NHEERL), US Environmental Protection Agency , Research Triangle Park , NC , USA and.
authors: W C
authors: WC
authors: Williams
authors: a Cardiopulmonary and Immunotoxicology Branch, Environmental Public Health Division, National Health, and Environmental Effects Laboratory (NHEERL), US Environmental Protection Agency , Research Triangle Park , NC , USA and.
authors: J R
authors: JR
authors: Lehmann
authors: a Cardiopulmonary and Immunotoxicology Branch, Environmental Public Health Division, National Health, and Environmental Effects Laboratory (NHEERL), US Environmental Protection Agency , Research Triangle Park , NC , USA and.
authors: E
authors: E
authors: Boykin
authors: b ICF International , Fairfax , VA , USA.
authors: M K
authors: MK
authors: Selgrade
authors: a Cardiopulmonary and Immunotoxicology Branch, Environmental Public Health Division, National Health, and Environmental Effects Laboratory (NHEERL), US Environmental Protection Agency , Research Triangle Park , NC , USA and.
authors: D M
authors: DM
authors: Lehmann
mesh_terms: D000485:Allergens / Q000633:toxicity*; D000818:Animals; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry / Q000166:cytology; D002452:Cell Count; D002712:Chlorides / Q000633:toxicity*; D004195:Disease Models, Animal; D005260:Female; D006967:Hypersensitivity / Q000097:blood / Q000209:etiology* / Q000276:immunology / Q000503:physiopathology; D007073:Immunoglobulin E / Q000097:blood; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008168:Lung / Q000187:drug effects* / Q000276:immunology / Q000503:physiopathology; D008807:Mice, Inbred BALB C; D017671:Platinum Compounds / Q000633:toxicity*
chemical_list: D000485:Allergens; D002712:Chlorides; D017671:Platinum Compounds; C018453:ammonium hexachloroplatinate; D007073:Immunoglobulin E; D007770:L-Lactate Dehydrogenase
keywords: Ammonium hexachloroplatinate; occupational asthma; platinum; pulmonary hyperresponsiveness; respiratory hypersensitivity; whole-body plethysmography