結腸癌是全球最致命和常見的腸道癌症之一。癌症起始細胞(CIC)或癌症幹細胞 (CSC)對腫瘤的產生、生長和轉移具有重大意義。從原發性結腸腫瘤組織中純化和分 離具有致腫瘤潛能的結腸 CSC(CIC)，將有助於未來開發新的診斷和個性化治療方法。 在本研究中，我們利用耐倫薄膜和聚乳酸-聚乙二醇酸薄膜(PLGA/SK)過濾器的膜 過濾法純化了結腸癌細胞株 CoLo205 和 SW480 的 CSC (CIC)並作為原發性結腸癌細 胞的模型。純化效率將通過(i)CD44 和 CD133 標記的表達，(ii)集落形成單位試驗， 和(iii)癌胚抗原(CEA)的濃度進行檢測。實驗結果顯示，在細胞通過薄膜後，與滲 透液和回收液中的細胞相比，CSC(CIC)在遷移的細胞中具有更高的純度。然而，與滲 透液和回收液中的細胞相比，遷移的細胞產生了類似的集落形成單位效率。 接著我們將結腸癌細胞株與人類成纖維細胞 CG1639 共培養，且分別用細胞追蹤劑: 紅色與藍色染劑來進行標記。以便在使用膜過濾法將結腸癌細胞與成纖維細胞分離時， 可以利用流式細胞儀及螢光顯微鏡進行鑑定。我們的實驗結果表明，回收溶液的 CoLo205 細胞的純度可以從 50%提高到 80%，表明有更高比例的癌細胞殘留。 當結腸癌細胞和成纖維細胞的混合溶液通過膜時，結腸癌細胞保留在回收液中。因 此，使用本研究開發的膜過濾法，預計可以從患者的腫瘤組織中分離出高比例的結腸 CSC(CIC)。;Colon carcinoma is one of the most fatal and common gastrointestinal cancers in the world. Cancer-initiation cells (CICs) or cancer stem cells (CSCs), are responsible for tumor initiation, growth, and metastasis. The purification and isolation of tumorigenic colon CSCs (CICs) from primary colon tumor tissues should be valuable for the development of novel diagnostic and personal therapeutic treatments in the future. In this study, CSCs (CICs) of colon carcinoma cell line CoLo205 and SW480 (model of primary colon carcinoma cells) were purified from human fibroblasts (CG1639). Furthermore, the primary colon carcinoma cells were purified from colon tumor tissues of patients utilizing the membrane filtration method via nylon mesh filters and poly(lactide-co-glycolic acid)/silk screen (PLGA/SK) filters. In the separation of colon carcinoma cells from fibroblasts, both cells were stained with Cell Tracker Red and Blue, respectively for their identification using flow cytometry. CoLo205 purity was enhanced from 50% to 80% in the recovery fraction, which showed the higher cancer cells remaining. The isolation efficiency was characterized using (i) CD44 and CD133 marker expression, (ii) colony-forming unit assay, and (iii) carcinoembryonic antigen (CEA) production. Especially, CSCs (CICs) were purified in the migrated cells compared to the cells in permeation solution and recovery solution, when CoLo205 or SW480 cells were permeated through the membranes. However, the migrated cells generated similar efficiency of colony forming unit compared to the cells in the permeate solution and recovery solution. The colon cancer cells remained in the recovery solution, when the mixed solution of colon cancer cells and fibroblasts were permeated through the membranes. Therefore, a high proportion of colon CSCs (CICs) from the patient’s tumor tissue is expected to be isolated using the membrane filtration method developed in this study.
