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Functional Blockade Of E-Selectin In Tumor-Associated Vessels Enhances Anti-Tumor Effect Of Doxorubicin In Breast Cancer, Yoshihiro Morita, Macall Leslie, Hiroyasu Kameyama, Ganesh L R Lokesh, Norihisa Ichimura, Rachel Davis, Natalie Hills, Nafis Hasan, Roy Zhang, Yuji Kondo, David G Gorenstein, David E Volk, Inna Chervoneva, Hallgeir Rui, Takemi Tanaka

Department of Pharmacology and Experimental Therapeutics Faculty Papers

Chemotherapy is a mainstay of treatment for solid tumors. However, little is known about how therapy-induced immune cell infiltration may affect therapy response. We found substantial CD45+ immune cell density adjacent to E-selectin expressing inflamed vessels in doxorubicin (DOX)-treated residual human breast tumors. While CD45 level was significantly elevated in DOX-treated wildtype mice, it remained unchanged in DOX-treated tumors from E-selectin null mice. Similarly, intravenous administration of anti-E-selectin aptamer (ESTA) resulted in a significant reduction in CD45+ immune cell density in DOX-treated residual tumors, which coincided with a delay in tumor growth and lung metastasis in MMTV-pyMT mice. Additionally, both …