Preferential expression of matrix metalloproteinase-9 in mouse skin after sulfur mustard exposure.

Published on May 1, 2006in Journal of Applied Toxicology2.997
· DOI :10.1002/JAT.1134
Michael P. Shakarjian12
Estimated H-index: 12
(RU: Rutgers University),
Pinaki Bhatt3
Estimated H-index: 3
(RU: Rutgers University)
+ 9 AuthorsDonald R. Gerecke18
Estimated H-index: 18
(RU: Rutgers University)
Matrix metalloproteinases (MMPs), a class of enzymes responsible for the degradation of extracellular matrix proteins, play important roles in inflammatory and immune responses. In skin, MMP-2 (gelatinase A) and MMP- 9 (gelatinase B) are normally inactive but can be expressed during tissue injury. Both degrade collagen IV and other critical components of the basement membrane zone that separates the epidermis from the dermis. The expression of MMP-2 and -9 was studied in sulfur mustard (SM)-exposed ear skin from mice to determine their role in tissue vesicant injury. Punch biopsies of mouse ears were collected between 6 and 168 h after exposure to 97.5 mM (0.08 mg) SM diluted in CH2Cl2. They were examined histologically and assayed for MMP-2 and -9 expression by gelatinase activity assays, real- time reverse transcriptase-polymerase chain reaction and Western blot analysis. A time-related increase in overall gelatinase activity was observed in SM-treated ears. At 168 h after SM exposure, the relative levels of MMP-9 mRNA were increased 27-fold and MMP-9 protein 9-fold when compared with the control (CH2Cl2 treated) ears. In contrast, there were no observable increases in the MMP-2 mRNA or protein levels between treated and control ears. These observations suggest the differential expression of MMP-2 and -9 during the cutaneous response to SM injury and suggest a role for MMP-9 in SM-induced injury. Copyright © 2006 John Wiley & Sons, Ltd.
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