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Tips from the American Journal of Pathology
Date:3/24/2009

of white blood cells. Study of psoriasis has been limited, however, due to the absence of a mouse model that adequately reproduces these symptoms.

Over-expression Tie-2, a molecule involved in the formation of new blood vessels, in two types of skin cells, epithelial cells and keratinocytes, has provided the best psoriasis model to date. To determine whether Tie-2 over-expression in epithelial cells or keratinocytes resulted in the psoriasis phenotype, Wolfram et al engineered two new mouse models in which Tie-2 expression was limited to either epithelial cells or keratinocytes. Only the keratinocyte-restricted Tie-2 mice developed symptoms similar to human psoriasis. These symptoms were reduced by treatment with cyclosporin A, a common psoriasis therapy. Keratinocyte-restricted Tie-2 mice, therefore, may serve as an animal model for human psoriasis.

The psoriasis model developed by Dr. Ward's group "bears a striking resemblance to human psoriasis, meeting multiple criteria at the clinical, histological, biochemical, immunophenotype, and pharmacologic levels and therefore will become important for studying pathological mechanisms of psoriasis and pre-clinical testing of new therapeutics."

Wolfram JA, Diaconu D, Hatala DA, Rastegar J, Knutsen DA, Lowther A, Askew D, Gilliam AC, McCormick TS, Ward NL: Keratinocyte but not endothelial cell specific over-expression of Tie-2 leads to the development of psoriasis. Am J Pathol 2009, 174: 1443-1458


New Marker for Prostate Cancer Progression

Avraham Raz and colleagues at the University of Michigan have identified a cleaved form of galectin-3 as a marker for prostate cancer progression. These data are presented in the April 2009 issue of The American Journal of Pathology.

Prostate cancer is a common malignancy among men over the age of 50. The stage at which prostate cancer is diagnosed is critical for determining prognosis as well a
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Contact: Angela Colmone
acolmone@asip.org
301-634-7953
American Journal of Pathology
Source:Eurekalert

Page: 1 2 3 4 5

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