The Journal of Experimental Medicine
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J. Exp. Med., Volume 188, Number 12, December 21, 1998 2349-2356

Vasostatin, a Calreticulin Fragment, Inhibits Angiogenesis and Suppresses Tumor Growth

By Sandra E. Pike,* Lei Yao,* Karen D. Jones,* Barry Cherney,* Ettore Appella,Dagger Kazuyasu Sakaguchi,Dagger Hira Nakhasi,* Julie Teruya-Feldstein,§ Peter Wirth,parallel Ghanshyam Gupta,* and Giovanna Tosato*

From the * Center for Biologics Evaluation and Research, Rockville, Maryland 20852; and the Dagger  Laboratory of Cell Biology, the § Laboratory of Pathology, and the parallel  Laboratory of Experimental Carcinogenesis, National Cancer Institute, Bethesda, Maryland 20892

An endothelial cell inhibitor was purified from supernatant of an Epstein-Barr virus-immortalized cell line and identified as fragments of calreticulin. The purified recombinant NH2-terminal domain of calreticulin (amino acids 1-180) inhibited the proliferation of endothelial cells, but not cells of other lineages, and suppressed angiogenesis in vivo. We have named this NH2-terminal domain of calreticulin vasostatin. When inoculated into athymic mice, vasostatin significantly reduced growth of human Burkitt lymphoma and human colon carcinoma. Compared with other inhibitors of angiogenesis, vasostatin is a small, soluble, and stable molecule that is easy to produce and deliver. As an angiogenesis inhibitor that specifically targets proliferating endothelial cells, vasostatin has a unique potential for cancer treatment.

Key words: endothelial cellsangiogenesiscell growthcancerantitumor agent


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