CD133 has been identified as a cancer stem cell marker in colon and several other cancers, but its function is still unknown. We examined the CD133 expression in 44 human cancer cell lines, and found five of the 8 positive lines were from colon cancer. The CD133 positive subpopulation of colon cancer cells showed more vigorous growth and lower differentiation. Induction of differentiation reduced the CD133-positive population. Knockdown of CD133 expression in colon cancer cells could not induce cellular differentiation. Care must be taken if CD133 is used as the only marker of cancer stem cells in colon cancer, especially in established cell lines. CD133 negatively correlates with cell differentiation, but it is not a regulator of differentiation.
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