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p16 (also known as p16 INK4a, cyclin-dependent kinase inhibitor 2A, CDKN2A, multiple tumor suppressor 1 and numerous other synonyms), is a protein that slows cell division by slowing the progression of the cell cycle from the G1 phase to the S phase, thereby acting as a tumor suppressor.
During this process, a feedback loop exists between P16 and Rb, and P16 expression is controlled by Rb. [22] [23] P16/Rb pathway collaborates with the mitogenic signaling cascade for the induction of reactive oxygen species, which activates the protein kinase C delta, leading to an irreversible cell cycle arrest. Thus P16 participates not only ...
The pRb protein is inactivated by E7 in HPV+OPC, but in HPV-OPC it is the p16 tumour suppressor part of the pRb tumour suppressor network that is inactivated. Also the pRb pathway is inactivated by E7 instead of Cyclin D1 amplification.
The members of this family (p16 INK4a, p15 INK4b, p18 INK4c, p19 INK4d) are inhibitors of CDK4 (hence their name INhibitors of CDK4), and of CDK6. The other family of CKIs, CIP/KIP proteins are capable of inhibiting all CDKs. Enforced expression of INK4 proteins can lead to G1 arrest by promoting redistribution of Cip/Kip proteins and blocking ...
In short, p53 is a tumor-suppressor protein that arrests the cell cycle and prevents cell growth and survival when DNA damage occurs. [48] Thus, the degradation of p53, induced by E6, promotes unregulated cell division, cell growth and cell survival, all characteristics of cancer.
The p16 protein is a cyclin dependent kinase (CDK) inhibitor and it activates Rb tumor suppressor. [42] p16 binds to CDK 4/6 to inhibit the kinase activity and inhibit Rb tumor suppressor via phosphorylation. [43]
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This gene lies adjacent to the tumor suppressor gene CDKN2A in a region that is frequently mutated, deleted, or disregulated in a wide variety of cancer. [7] [8] [9] This gene encodes a cyclin-dependent kinase inhibitor, also known as p15Ink4b protein, which forms a complex with CDK4 or CDK6, and prevents the activation of the CDK kinases by cyclin D, thus the encoded protein functions as a ...