Heterogenous expression of endoglin marks advanced renal cancer with distinct tumor microenvironment fitness.

Cancer Science
Yusaku MomoiShogo Ehata

Abstract

Intratumoral heterogeneity, including in clear cell renal cell carcinoma, is a potential cause of drug resistance and metastatic cancer progression. We specified the heterogeneous population marked by endoglin (also known as CD105) in a preclinical model of clear cell renal cell carcinoma progression. Highly malignant derivatives of human clear cell renal cell carcinoma OS-RC-2 cells were established as OS5Ks by serial orthotopic inoculation in our previous study. Expression of both ENG (encoding endoglin) mRNA and protein were heterogeneously upregulated in OS5Ks, and the endoglin-positive (ENG+ ) population exhibited growth dependency on endoglin in anchorage-independent cultures. Despite the function of endoglin as a type III receptor, transforming growth factor β and bone morphogenetic protein-9 signaling were unlikely to contribute to the proliferative phenotype. Although endoglin has been proposed as a marker for renal cancer-initiating cells, the OS5K-3 ENG+ population did not enrich other reported cancer-initiating cell markers or differentiate into the ENG- population. Mouse tumor inoculation models revealed that the tumor-forming capabilities of OS5K-3 ENG+ and ENG- cells in vivo were highly dependent on the microenvi...Continue Reading

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