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Cancer Stem Cells (CSCs) have been identified as a subset of distinct population in many tumors and can drive cancer relapse and metastasis with their abilities to self-renew and differentiate into various types of cancer cells. Development of therapies specifically and effectively targeting CSCs thus is necessary to improve the survival and quality of life for cancer patients, especially for patients with metastatic diseases.
Clone RV3 can be used for enrichment of CSCs with a cell sorter, and further be applied for studying mechanisms by which CSCs cause cancer relapse and metastasis to develop new drugs against CSCs with “in vitro sphere forming assay”, “in vivo lung metastasis assay”, etc.
In vitro evaluation of CSCs by “sphere formation assay"
In vitro sphere formation assays are colony formation assays used to evaluate the clonogenic potential of CSCs, and can be used to evaluate the potential effects of drugs. The figure above shows the sphere formation ability of CD44v9-High and CD44v9-Low cell populations sorted from a human prostate cancer cell line (PC-3) by using anti-CD44v9 monoclonal antibody, clone RV3 (Cat # MAB12149). The increased number of spheres observed in CD44v9-High population (CSC enriched) allows further accurate assessment for the effects of inhibitory drugs and other treatments on CSC sphere formation.
In vivo evaluation of CSCs by "lung metastasis assay"
Lung metastasis assay, injecting tumorigenic cells into mice intravenously, provides an opportunity to assess the inhibitory effects of compounds or other treatments on the ability of CSC to colonize. Injection of sorted CD44v9-High cells significantly increased the efficiency of metastasis formation and would be applied to evaluate the effectiveness of new anti-CSC therapeutic strategies.