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Evaluation of 14-3-3 sigma as a potential partner of p16 in quiescence and differentiation.
In Vitro Cellular & Developmental Biology. Animal 2018 October
p16 is an important tumor suppressor gene encoded by the INK4A/ARF/INK4B gene locus that is conserved in humans, rodents, and canids. p16 regulates cell cycle in early G1 phase inhibiting transition out of cell cycle from G1/S phase by regulating a multi-protein control complex. p16-associated proteins, cyclin D, CDK4, and CDK6, experience expression level decreases or do not change during cell differentiation and quiescence in contrast to constant p16 expression in post-proliferative cell phases. We hypothesized that p16 has alternate binding partners, other than classical proliferation-associated proteins such as CDKs, in these post-proliferative cell phases. Using co-immunoprecipitation, we have identified 14-3-3σ as a potential alternate binding partner for p16 in quiescent post-proliferative canine mammary cancer cells. Additionally, expression of 14-3-3σ was maintained as fibroblasts exit cell cycle and differentiate to adipocytes simultaneously with continued expression of p16. Based on these results, we suggest that 14-3-3σ protein may be an alternative binding partner for p16 active during cell quiescence and may associate with p16 during cell differentiation.
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