Kdm6a deficiency activates inflammatory pathways, promotes M2 macrophage polarization, and causes bladder cancer in cooperation with p53 dysfunction

Kohei Kobatake, Ken Ichiro Ikeda, Yuichiro Nakata, Norimasa Yamasaki, Takeshi Ueda, Akinori Kanai, Kazuhiro Sentani, Yasuyuki Sera, Tetsutaro Hayashi, Miho Koizumi, Yoshihiko Miyakawa, Toshiya Inaba, Yusuke Sotomaru, Osamu Kaminuma, Tatsuo Ichinohe, Zen Ichiro Honda, Wataru Yasui, Shigeo Horie, Peter C. Black, Akio MatsubaraHiroaki Honda

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Purpose: Epigenetic deregulation is deeply implicated in the pathogenesis of bladder cancer. KDM6A (Lysine (K)-specific demethylase 6A) is a histone modifier frequently mutated in bladder cancer. However, the molecular mechanisms of how KDM6A deficiency contributes to bladder cancer development remains largely unknown. We hypothesized that clarification of the pathogenic mechanisms underlying KDM6Amutated bladder cancer can help in designing new anticancer therapies. Experimental Design: We generated mice lacking Kdm6a in the urothelium and crossed them with mice heterozygous for p53, whose mutation/deletion significantly overlaps with the KDM6A mutation in muscle-invasive bladder cancer (MIBC). In addition, BBN (N-butyl-N-(4-hydroxybutyl) nitrosamine), a cigarette smoke-like mutagen, was used as a tumor-promoting agent. Isolated urothelia were subjected to phenotypic, pathologic, molecular, and cellular analyses. The clinical relevance of our findings was further analyzed using genomic and clinical data of patients with MIBC. Results: We found that Kdm6a deficiency activated cytokine and chemokine pathways, promoted M2 macrophage polarization, increased cancer stem cells and caused bladder cancer in cooperation with p53 haploinsufficiency.We also found that BBN treatment significantly enhanced the expression of proinflammatory molecules and accelerated disease development. Human bladder cancer samples with decreased KDM6A expression also showed activated proinflammatory pathways. Notably, dual inhibition of IL6 and chemokine (C-C motif) ligand 2, upregulated in response to Kdm6a deficiency, efficiently suppressed Kdm6adeficient bladder cancer cell growth. Conclusions: Our findings provide insights into multistep carcinogenic processes of bladder cancer and suggest molecular targeted therapeutic approaches for patients with bladder cancer with KDM6A dysfunction.

Original languageEnglish (US)
Pages (from-to)2065-2079
Number of pages15
JournalClinical Cancer Research
Volume26
Issue number8
DOIs
StatePublished - Apr 15 2020
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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