alexa Distinct types of tumor-initiating cells form human colon cancer tumors and metastases.
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Dieter SM, Ball CR, Hoffmann CM, Nowrouzi A, Herbst F,

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Abstract Human colon cancer harbors a small subfraction of tumor-initiating cells (TICs) that is assumed to be a functionally homogeneous stem-cell-like population driving tumor maintenance and metastasis formation. We found unexpected cellular heterogeneity within the TIC compartment, which contains three types of TICs. Extensively self-renewing long-term TICs (LT-TICs) maintained tumor formation in serial xenotransplants. Tumor transient amplifying cells (T-TACs) with limited or no self-renewal capacity contributed to tumor formation only in primary mice. Rare delayed contributing TICs (DC-TICs) were exclusively active in secondary or tertiary mice. Bone marrow was identified as an important reservoir of LT-TICs. Metastasis formation was almost exclusively driven by self-renewing LT-TICs. Our results demonstrate that tumor initiation, self-renewal, and metastasis formation are limited to particular subpopulations of TICs in primary human colon cancer. We identify LT-TICs as a quantifiable target for therapies aimed toward eradication of self-renewing tumorigenic and metastatic colon cancer cells. Copyright © 2011 Elsevier Inc. All rights reserved. This article was published in Cell Stem Cell and referenced in Journal of Addiction Research & Therapy

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