Epithelial overexpression of SOCS-3 in transgenic mice exacerbates wound inflammation in the presence of elevated TGF-beta1

The Journal of Investigative Dermatology
Andreas LinkeStefan Frank

Abstract

The suppressor of cytokine signaling (SOCS)-3 has been shown to impair proliferation and migration of keratinocytes. To assess the functional dependency among wound inflammation, SOCS-3 induction in keratinocytes, and the outcome of healing, we generated a transgenic mouse that specifically overexpresses SOCS-3 in keratinocytes. Acute wound healing in transgenic mice was severely impaired. Keratinocyte-specific overexpression of SOCS-3 led to atrophied wound-margin epithelia and augmented the inflammatory response of wound keratinocytes by an increase in chemokine (MIP-2) and inflammatory enzyme (COX-2 and iNOS) expression. In addition, wound tissue of transgenic mice showed a prolonged persistence of neutrophils and macrophages. Remarkably, impaired wounds showed elevated levels of transforming growth factor (TGF)-beta1, which appeared to interfere with healing, as its neutralization markedly improved wound closure in transgenic mice. Interestingly, administration of a TGF-beta-neutralizing antibody increased wound inflammation in nontransgenic mice but not in transgenic littermates. This study suggests that SOCS-3-driven disturbances in wound keratinocytes are sufficient to induce inflamed wound conditions that resemble chara...Continue Reading

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May 18, 2012·Cytokine & Growth Factor Reviews·Yi LiC Janneke van der Woude
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