Summary: Tumorbio-8

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  • 1 Tumorbio-8

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  • What is dukes classification of CRC?

    A = cancer is confirmed to the lining of the colon
    B = cancer has penetrated the colon wall
    C = cancer has spread to lymph nodes
    D = cancer has spread to other organs
  • What is the effect of APC?

    function of a scaffolding protein (GATEKEEPER) -> affecting cell-adhesion and migration segregation
  • What is the effect of the WNT signalling pathway?

    phosphorylation or degradation of beta-catenin
  • What happens when APC is mutated in WNt siganlling?

    beta-catenin binds to the TCF family of TFs, altering the expression of various genes affecting different processes in the colonic crypt
  • What is the effect of inactivation of APC?

    chromosome instability -> defects in mitotic spindles and chromosome missegregated -> aneuploidy -> cancer
  • What is in the destruction complex for WNT?

    APC, axin, GSK3, casein kinase I
  • What is the effect of the destruction complex?

    phosphorylation beta-catenin -> polybiquinated by E3 ligase TrCP -> proteasome degrades Bcat
  • What is the effect of TCF proteins?

    block degradation of Bcatenin by the proteasome
  • What is canonical model fpr Wnt regulation?

    ligand bind LRP5/6 -> axin binding site -> inactivates the destruction complex -> Bcat stabiel -> displaced groucho from TCF -> Bcat + TCF -> transcriptie in crypt stem cells
  • What is the effect of mutations in CTNNB1?

    no phosphorylation of Bcatenin -> no degradation -> transcription!
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