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Journal of Histochemistry and Cytochemistry, Vol. 49, 237-246, February 2001, Copyright © 2001, The Histochemical Society, Inc.

ARTICLE

The Murine Receptor for Urokinase-Type Plasminogen Activator Is Primarily Expressed in Tissues Actively Undergoing Remodeling

Helene Solberga, Michael Plouga, Gunilla Høyer–Hansena, Boye S. Nielsena, and Leif R. Lunda
a The Finsen Laboratory, Rigshospitalet, Copenhagen, Denmark

Correspondence to: Helene Solberg, The Finsen Laboratory, Rigshospitalet, Strandboulevarden 49, DK-2100 Copenhagen Ø, Denmark. E-mail: Helene@finsenlab.dk

uPAR is a cellular receptor for urokinase plasminogen activator, an enzyme involved in extracellular matrix degradation during processes involving tissue remodeling. We have expressed a recombinant soluble form of murine uPAR and raised rabbit polyclonal antibodies to study the expression of uPAR by immunohistochemistry. The immunohistochemical localization of uPAR was determined in normal mouse organs and in tumors formed by the highly metastatic Lewis lung carcinoma. uPAR immunoreactivity was found in the lungs, kidneys, and spleen, and in endothelial cells in the uterus, urinary bladder, thymus, heart, liver, and testis. No uPAR immunoreactivity was detected in muscle. In general, strong uPAR immunoreactivity was observed in organs undergoing extensive tissue remodeling, as exemplified by trophoblast cells in placenta, and in migrating, but not resting, keratinocytes at the edge of incisional wounds. Staining was not detected in any tissue sections derived from uPAR-deficient mice, thus confirming the specificity of the immunohistochemical staining of uPAR in normal mouse tissues. In Lewis lung carcinoma, uPAR immunoreactivity was found in the tumor cells of the primary tumor and in lung metastases. (J Histochem Cytochem 49:237–246, 2001)

Key Words: uPAR, immunohistochemistry, mouse, tissue remodeling, cancer


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