2. Academic Validation
  3. Resistance to docetaxel in prostate cancer is associated with androgen receptor activation and loss of KDM5D expression

Resistance to docetaxel in prostate cancer is associated with androgen receptor activation and loss of KDM5D expression

  • Proc Natl Acad Sci U S A. 2016 May 31;113(22):6259-64. doi: 10.1073/pnas.1600420113.
Kazumasa Komura 1,  Seong Ho Jeong 2,  Kunihiko Hinohara 2,  Fangfang Qu 2,  Xiaodong Wang 2,  Masayuki Hiraki 2,  Haruhito Azuma 3,  Gwo-Shu Mary Lee 2,  Philip W Kantoff 4,  Christopher J Sweeney 5
Affiliations

Affiliations

  • 1 Department of Urology, Osaka Medical College, Osaka 569-8686, Japan; Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215; Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065;
  • 2 Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215;
  • 3 Department of Urology, Osaka Medical College, Osaka 569-8686, Japan;
  • 4 Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215; Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065; [email protected] [email protected].
  • 5 Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215; Harvard Medical School, Boston, MA 02215 [email protected] [email protected].
PMID: 27185910 DOI: 10.1073/pnas.1600420113
Abstract

The Androgen Receptor (AR) plays an essential role in prostate Cancer, and suppression of its signaling with androgen deprivation therapy (ADT) has been the mainstay of treatment for metastatic hormone-sensitive prostate Cancer for more than 70 y. Chemotherapy has been reserved for metastatic castration-resistant prostate Cancer (mCRPC). The Eastern Cooperative Oncology Group-led trial E3805: ChemoHormonal Therapy Versus Androgen Ablation Randomized Trial for Extensive Disease in Prostate Cancer (CHAARTED) showed that the addition of docetaxel to ADT prolonged overall survival compared with ADT alone in patients with metastatic hormone-sensitive prostate Cancer. This finding suggests that there is an interaction between AR signaling activity and docetaxel sensitivity. Here we demonstrate that the prostate Cancer cell lines LNCaP and LAPC4 display markedly different sensitivity to docetaxel with AR activation, and RNA-seq analysis of these cell lines identified KDM5D (lysine-specific demethylase 5D) encoded on the Y chromosome as a potential mediator of this sensitivity. Knocking down KDM5D expression in LNCaP leads to docetaxel resistance in the presence of dihydrotestosterone. KDM5D physically interacts with AR in the nucleus, and regulates its transcriptional activity by demethylating H3K4me3 active transcriptional marks. Attenuating KDM5D expression dysregulates AR signaling, resulting in docetaxel insensitivity. KDM5D deletion was also observed in the LNCaP-derived CRPC cell line 104R2, which displayed docetaxel insensitivity with AR activation, unlike parental LNCaP. Dataset analysis from the Oncomine database revealed significantly decreased KDM5D expression in CRPC and poorer prognosis with low KDM5D expression. Taking these data together, this work indicates that KDM5D modulates the AR axis and that this is associated with altered docetaxel sensitivity.

Keywords

JARID1D; KDM5D; androgen receptor; docetaxel; prostate cancer.

Figures