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Related Experiment Video

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Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer
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Selenoprotein P influences colitis-induced tumorigenesis by mediating stemness and oxidative damage.

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    Selenoprotein P (SEPP1) is crucial for antioxidant defense. Reduced SEPP1 function exacerbates inflammatory bowel disease-associated colon cancer by increasing oxidative stress and genomic instability.

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    Area of Science:

    • Biochemistry
    • Oncology
    • Immunology

    Background:

    • Inflammatory bowel disease (IBD) patients face elevated colon cancer risk due to oxidative stress and weakened antioxidant defenses.
    • Selenium is vital for selenoprotein synthesis; Selenoprotein P (SEPP1) transports selenium and has antioxidant roles.

    Purpose of the Study:

    • To investigate the role of SEPP1 in colitis-associated carcinogenesis.
    • To elucidate SEPP1's impact on genomic stability, the tumor microenvironment, and epithelial stem cell function.

    Main Methods:

    • Utilized mouse models with Sepp1 haploinsufficiency or mutations affecting selenium transport/enzymatic activity.
    • Analyzed tumor burden, genomic instability, macrophage polarization, and apoptosis.
    • Employed intestinal organoid cultures to assess stem cell characteristics and response to oxidative stress.

    Main Results:

    • Sepp1 deficiency or dysfunction increased colitis-associated carcinogenesis, genomic instability, and protumorigenic microenvironments.
    • Reduced SEPP1 function promoted M2-polarized macrophages, impacting immune function.
    • Complete Sepp1 loss reduced tumor burden via increased apoptosis; organoids showed increased stemness, ROS, DNA damage, and altered WNT signaling.

    Conclusions:

    • SEPP1 is a key regulator of inflammatory tumorigenesis.
    • SEPP1 influences genomic stability, the inflammatory milieu, and epithelial stem cell behavior.
    • Targeting SEPP1 may offer therapeutic strategies for IBD-associated colon cancer.