Sulfur mustard induced mast cell degranulation in mouse skin is inhibited by a novel anti-inflammatory and anticholinergic bifunctional prodrug.

Published on Sep 1, 2018in Toxicology Letters4.374
· DOI :10.1016/J.TOXLET.2017.11.005
Laurie B. Joseph13
Estimated H-index: 13
(RU: Rutgers University),
Gabriella M. Composto5
Estimated H-index: 5
(RU: Rutgers University)
+ 10 AuthorsDiane E. Heck4
Estimated H-index: 4
(NYMC: New York Medical College)
Abstract Sulfur mustard (SM, bis(2-chloroethyl sulfide) is a potent vesicating agent known to cause skin inflammation, necrosis and blistering. Evidence suggests that inflammatory cells and mediators that they generate are important in the pathogenic responses to SM. In the present studies we investigated the role of mast cells in SM-induced skin injury using a murine vapor cup exposure model. Mast cells, identified by toluidine blue staining, were localized in the dermis, adjacent to dermal appendages and at the dermal/epidermal junction. In control mice, 48–61% of mast cells were degranulated. SM exposure (1.4 g/m3 in air for 6 min) resulted in increased numbers of degranulated mast cells 1–14 days post-exposure. Treatment of mice topically with an indomethacin choline bioisostere containing prodrug linked by an aromatic ester-carbonate that targets cyclooxygenases (COX) enzymes and acetylcholinesterase (1% in an ointment) 1–14 days after SM reduced skin inflammation and injury and enhanced tissue repair. This was associated with a decrease in mast cell degranulation from 90% to 49% 1–3 days post SM, and from 84% to 44% 7–14 days post SM. These data suggest that reduced inflammation and injury in response to the bifunctional indomethacin prodrug may be due, at least in part, to abrogating mast cell degranulation. The use of inhibitors of mast cell degranulation may be an effective strategy for mitigating skin injury induced by SM.
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