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,1
Departments of
* Oncology and
Medicine, Hadassah-Hebrew University Medical Center, Jerusalem, Israel;
Department of Nephrology, Rabin Medical Center, Petach-Tikva, Israel;
Department of Medical Biochemistry, University of Uppsala, The Biomedical Center, Uppsala, Sweden; and
|| Cancer and Vascular Biology Research Center, the Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
2Correspondence: Cancer and Vascular Biology Research Center, Faculty of Medicine, Technion, Haifa 31096, Israel. E-mail: vlodavsk{at}cc.huji.ac.il
We have generated homozygous transgenic mice (hpa-tg) overexpressing human heparanase (endo-ß-D-glucuronidase) in all tissues and characterized the involvement of the enzyme in tissue morphogenesis, vascularization, and energy metabolism. Biochemical analysis of heparan sulfate (HS) isolated from newborn mice and adult tissues revealed a profound decrease in the size of HS chains derived from hpa-tg vs. control mice. Despite this, the mice appeared normal, were fertile, and exhibited a normal life span. A significant increase in the number of implanted embryos was noted in the hpa-tg vs. control mice. Overexpression of heparanase resulted in increased levels of urinary protein and creatinine, suggesting an effect on kidney function, reflected also by electron microscopy examination of the kidney tissue. The hpa-tg mice exhibited a reduced food consumption and body weight compared with control mice. The effect of heparanase on tissue remodeling and morphogenesis was best demonstrated by the phenotype of the hpa-tg mammary glands, showing excess branching and widening of ducts associated with enhanced neovascularization and disruption of the epithelial basement membrane. The hpa-tg mice exhibited an accelerated rate of hair growth, correlated with high expression of heparanase in hair follicle keratinocytes and increased vascularization. Altogether, characterization of the hpa-tg mice emphasizes the involvement of heparanase and HS in processes such as embryonic implantation, food consumption, tissue remodeling, and vascularization.—Zcharia, E., Metzger, S., Chajek-Shaul, T., Aingorn, H., Elkin, M., Friedmann, Y., Weinstein, T., Li, J.-P., Lindahl, U., Vlodavsky, I. Transgenic expression of mammalian heparanase uncovers physiological functions of heparan sulfate in tissue morphogenesis, vascularization, and feeding behavior.
Key Words: transgenic mice • mammary glands • hair growth • implantation • heparan sulfate • angiogenesis • body weight
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