Significance of CD133 as a cancer stem cell markers focusing on the tumorigenicity of pancreatic cancer cell lines / 대한외과학회지

PURPOSE: The cancer stem cell hypothesis states that the capacity of a cancer to grow and propagate is dependent on a small subset of cells. To determine the significances of the cancer stem cell markers CD133, CD44, and CD24 using a comparative analysis with a focus on tumorigenicity. METHODS: Four pancreatic cancer cell lines, Capan-1, Mia-PACA-2, Panc-1, and SNU-410 were analyzed for the expressions of CD133, CD44, and CD24 by flow cytometry. The tumorigenicity was compared using tumor volumes and numbers of tumors formed/numbers of injection in nonobese diabetic severe combined deficiency mice. Fluorescence-activated cell sorting (FACS) analysis was used to confirm that xenograft explants originated from human pancreatic cancer cells. RESULTS: CD133 was positive in only Capan-1, CD44 positive in all, CD24 partially positive in Panc-1. After injecting 2 x 10(6) cells, all mice administered Capan-1 or Mia-Paca-2 developed tumors, 3 of 5 administered Panc-1 developed tumors, but no mouse administered SNU-410 developed any tumors. The volumes of Capan-1 tumors were seven times larger than those of Mia-Paca-2 tumors. When 2 x 10(5) or 2 x 10(4) of Capan-1 or Mia-Paca-2 was injected, tumors developed in all Capan-1 treated mice, but not in Mia-Paca-2 treated mice. Furthermore, xenograft explants of Capan-1 expressed CD133+CD44+ and Capan-1 injected mice developed lung metastasis. FACS analysis showed that xenograft explants originated from human pancreatic cancer cell lines. CONCLUSION: CD133 positive cells have higher tumorigenic and metastatic potential than CD44 and CD24 positive cells, which suggests that CD133 might be a meaningful cell surface marker of pancreatic cancer stem cells.

The clinical significance of the detection of cell surface marker and chromosome in leukemia / 重庆医科大学学报

Objective:To investigate the clinical significance of the detection of cell surface marker and chromosome in diagnosis,treatment and prognosis of leukemia. Methods:Morphologic typing and immunophenotyping were carried out in 22 untreated patients with leukemia respectively with FAB criteria and monoclonal antibodies(McAb) which were used to label cell surface marker. Chromosomal specimens were prepared by 48-hour culture method. Chromosome was analysed by G-banding technique. Results:All the 22 cases were diagnosed as leukemia by combined detection of morphology and immunology. Among them there were 8 acute lymphocytic leukemia(ALL) in which 2 cases expressed myeloid lineage-associated antigens(My+ ALL),9 acute meylocytic leukemia(AML) and 3 chronic lymphocytic leukemia(CLL). In addition,2 cases were diagnosed as acute undifferentiated leukemia(AUL). Chromosomal karyotype analysis was carried out in 17 cases,among which chromosomal abnormalities were found in 11 cases in which 2 cases with complex chromosomal deformity had non-remission(NR). With the exception of the 2 cases aforementioned,others had complete remission(CR). Conclusion:The proper detection of cell surface marker and chromosome on limited condition is helpful for the diagnosis of leukemia,which would provide an experimental evidence for personalized treatment and prognosis.

Implantation study on the potential of murine epidermal stem cell differentiation / 中国病理生理杂志

AIM: To investigate the potential of murine epidermal stem cell (ESC) differentiation after seeded in a biodegradable carrier and implanted subcutaneously into syngeneic recipient mice. METHODS: ES cells were induced in vitro to differentiate into ESCs. After stained with a fluorescent dye Hoechst 33342, these ESCs were seeded into a polyglycolic acid (PGA) net containing collagen gel, functioning as a cell carrier, and implanted subcutaneously into 129/J mice, which were syngeneic to these stem cells. RESULTS: The ESCs kept alive in the implant when observed under a fluorescent microscopy 3 weeks or longer after implantation, and could differentiate into hair follicle - like structure,glandular structure, and gave rise to additional structures displaying features resembling native dermis. No apparent rejection or severe side effects were observed at least 10 weeks post- implantation. CONCLUSION: It is feasible to use these ESCs as seed cells in the study to fabricate dermal equivalent having the potential to develop dermal appendages.