Cross-reactivity between halogenated platinum salts in an immediate-type respiratory hypersensitivity model. (15th October 2018)

• Record Type: Journal Article
• Authors: Lehmann, David M.; Williams, Wanda C.
• Is Part Of: Inhalation toxicology. Volume 30:Number 11/12(2018)
• Page Start: 472
• Page End: 481
• Publication Date: 2018-10-15
• Subjects: Platinum -- ammonium hexachloroplatinate -- ammonium tetrachloroplatinate -- occupational asthma -- respiratory hypersensitivity -- cross-reactivity -- whole-body plethysmography -- pulmonary hyperresponsiveness; Pulmonary toxicology -- Animal models -- Periodicals; Pulmonary toxicology -- Periodicals; Air -- Pollution -- Health aspects -- Periodicals; 616.200471
• DOI: 10.1080/08958378.2018.1554015
• Languages: English
• ISSNs: 0895-8378

Abstract

Abstract: Halogenated platinum salts can trigger the development of occupational asthma. Until recently, laboratory research into the development and manifestation of platinum hypersensitivity responses were hindered by the lack of an animal model suitable for assessing the functional consequences of allergic sensitization. We employed a newly developed mouse model to assess the potential allergenicity of ammonium tetrachloroplatinate (ATCP), compare the relative potency of ATCP and another platinum salt, ammonium hexachloroplatinate (AHCP) and assess potential cross-reactivity. Mice were topically sensitized with ATCP before being challenged by intratracheal aspiration (IA) with ATCP. Ventilatory responses were assessed using whole-body plethysmography (WBP). An immediate response (IR) was observed in ATCP-sensitized and challenged mice. Two days later, responsiveness to the nonspecific stimuli methacholine (Mch) was detected in ATCP-sensitized mice using WBP. Bronchoalveolar lavage fluid collected from sensitized mice contained an average of 3.3% eosinophils compared to less than 0.5% in non-sensitized mice ( p <.05). Serum harvested from sensitized mice also contained increased total serum immunoglobulin E ( p <.05). These data are the first to demonstrate that topical exposure to ATCP is sufficient to develop immediate type hypersensitivity and that a single intra-airway challenge is capable of triggering pulmonary responses. To investigate potential cross-reactivity, mice were sensitized to AHCP and, challenged by a single IA with a second platinum compound, ATCP. Compared to non-sensitized mice challenged with ATCP, these mice exhibited an IR, responsiveness to Mch, and eosinophilic infiltration in the lungs similar to that achieved with AHCP challenge, thus demonstrating cross-reactivity.