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Tumor Initiating Cells, Cell Cycle Control and Cancer Stem Cells

Tumor Initiating Cells, Cell Cycle Control and Cancer Stem Cells

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As D type cyclins accumulate during G1 they serve two functions:<br />

1. Catalytic: Cyclin D-dependent kinases phosphorylate Rb, contributing to its<br />

inactivation.<br />

2. Non-catalytic:<br />

- CyclinD-CDK complexes bind <strong>and</strong> sequester p21/p27 proteins,<br />

leading to free E-CDK2 activity, which further inactivates pRb.

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