Abstract
The identification and separation of small intestinal epithelial stem cells are still on the preliminary stage. In this study, we planned to utilize immunohistochemistry, fluorescence-activated cell sorting (FACS) and RT-PCR to investigate the possibility of CD133 and CD44 as markers of human small intestinal epithelial stem cells. The expressions of CD133, CD44 and Lgr5 were studied by immunohistochemistry. Four subgroups of CD133+CD44+, CD133+CD44−, CD133−CD44+, CD133−CD44− were sorted out through FACS and the expression level of Lgr5 gene was measured by RT-PCR and polyacrylamide gel electropheresis (PAGE) with sliver stained. Ten cases of samples were available for analyzing. By immunohistochemical staining, few cells with positive expressions of CD133, CD44 and Lgr5 were distributed in the bottom of crypts with the expression locations somewhat overlapped. The average percentage of CD133+CD44+ cells was 0.0580 ± 0.0403%, while the corresponding contents of CD133+CD44− cells, CD133−CD44+ cells and CD133−CD44− cells were 0.4000 ± 0.1225%, 0.7000 ± 0.2646% and 76.5600 ± 3.5529% respectively. Ten times of positive expressions of Lgr5 were detected in the CD133+CD44+ groups, while 9/10, 8/10 and 4/10 times for CD133+CD44−, CD133−CD44+ and CD133−CD44− subgroups respectively. With the help of Quantityone 4.62 software, the densities of corresponding place to Lgr5 and reference gene were obtained. The density ratios of corresponding place to Lgr5 to reference gene were significant difference between subgroups (P < 0.001). By means of LSD method, the density ratios in CD133+CD44+ subgroups had statistical differences from the other subgroups (P < 0.05). We concluded CD133+CD44+ cells may be human small intestinal epithelial stem cells, which need further researches to confirm.
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Acknowledgements
This study was granted by National Natural Science Foundation of China (No. 30600591). The authors thank Dr Ashok Kunwar (Department of Urology, West China Hospital, Sichuan University, P.R.China) for his diligent checking of the manuscript.
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Hou, NY., Yang, K., Chen, T. et al. CD133+CD44+ subgroups may be human small intestinal stem cells. Mol Biol Rep 38, 997–1004 (2011). https://doi.org/10.1007/s11033-010-0195-y
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DOI: https://doi.org/10.1007/s11033-010-0195-y