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  • 1.
    Gonzalez-Rodriguez, Patricia
    et al.
    Karolinska Inst, Inst Environm Med, Toxicol Unit, S-17177 Stockholm, Sweden.
    Engskog-Vlachos, Pinelopi
    Karolinska Inst, Inst Environm Med, Toxicol Unit, S-17177 Stockholm, Sweden.
    Zhang, Hanzhao
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Hallböök: Stem cells, Retinal Development and Regeneration. Karolinska Inst, Inst Environm Med, Toxicol Unit, S-17177 Stockholm, Sweden.
    Murgoci, Adriana-Natalia
    Karolinska Inst, Inst Environm Med, Toxicol Unit, S-17177 Stockholm, Sweden.
    Zerdes, Ioannis
    Karolinska Inst, Dept Oncol Pathol, S-17177 Stockholm, Sweden.
    Joseph, Bertrand
    Karolinska Inst, Inst Environm Med, Toxicol Unit, S-17177 Stockholm, Sweden.
    SETD2 mutation in renal clear cell carcinoma suppress autophagy via regulation of ATG122020In: Cell Death and Disease, ISSN 2041-4889, E-ISSN 2041-4889, Vol. 11, article id 69Article in journal (Refereed)
    Abstract [en]

    Inactivating mutations in the SETD2 gene, encoding for a nonredundant histone H3 methyltransferase and regulator of transcription, is a frequent molecular feature in clear cell renal cell carcinomas (ccRCC). SETD2 deficiency is associated with recurrence of ccRCC and bears low prognostic values. Targeting autophagy, a conserved catabolic process with critical functions in maintenance of cellular homeostasis and cell conservation under stress condition, is emerging as a potential therapeutic strategy to combat ccRCC. Epigenetics-based pathways are now appreciated as key components in the regulation of autophagy. However, whether loss of function in the SETD2 histone modifying enzyme occurring in ccRCC cells may impact on their ability to undergo autophagy remained to be explored. Here, we report that SETD2 deficiency in RCC cells is associated with the aberrant accumulation of both free ATG12 and of an additional ATG12-containing complex, distinct from the ATG5-ATG12 complex. Rescue of SETD2 functions in the SETD2 deficiency in RCC cells, or reduction of SETD2 expression level in RCC cells wild type for this enzyme, demonstrates that SETD2 deficiency in RCC is directly involved in the acquisition of these alterations in the autophagic process. Furthermore, we revealed that deficiency in SETD2, known regulator of alternative splicing, is associated with increased expression of a short ATG12 spliced isoform at the depend of the canonical long ATG12 isoform in RCC cells. The defect in the ATG12-dependent conjugation system was found to be associated with a decrease autophagic flux, in accord with the role for this ubiquitin-like protein conjugation system in autophagosome formation and expansion. Finally, we report that SETD2 and ATG12 gene expression levels are associated with favorable respective unfavorable prognosis in ccRCC patients. Collectively, our findings bring further argument for considering the SETD2 gene status of ccRCC tumors, when therapeutic interventions, such as targeting the autophagic process, are considered to combat these kidney cancers.

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