Related Experiment Video

Updated: Sep 24, 2025

miRNA Expression Analyses in Prostate Cancer Clinical Tissues
11:29

miRNA Expression Analyses in Prostate Cancer Clinical Tissues

Published on: September 8, 2015

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Targeting cyclin-dependent kinase 7-association between CDK7 and pMED1 expression in prostate cancer tissue

Finn-Ole Paulsen1,2, Duan Kang1, Finn Becker1

  • 1Institute of Pathology, University Medical Center Schleswig-Holstein, SH 23562, Luebeck, Germany.

Carcinogenesis
|May 5, 2022
PubMed

Insights

Cyclin-dependent kinase 7 (CDK7) is frequently found in prostate cancer (PCa) and predicts recurrence. Targeting CDK7 may offer a new treatment for advanced PCa.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Androgen receptor (AR) signaling is crucial in prostate cancer (PCa) development and castration resistance.
  • Cyclin-dependent kinase (CDK) 7-mediated phosphorylation of Mediator-complex subunit 1 (MED1) enhances AR activity.
  • CDK7 inhibitors are under investigation for solid tumors, including PCa.

Purpose of the Study:

  • To characterize the CDK7/phospho-MED1 (pMED1) axis in human prostate cancer tissues.
  • To evaluate the prognostic significance of CDK7 expression in PCa.
  • To explore the correlation between CDK7, pMED1, and AR expression in PCa.

Main Methods:

  • Immunohistochemistry was performed on 595 PCa samples, including primary tumors, advanced/recurrent tumors, lymph node metastases (LNM), distant metastases (DM), and benign tissues.
  • Protein levels of CDK7 and pMED1 were analyzed.
  • Statistical analyses, including multivariate Cox-regression, were used to assess correlations and survival outcomes.

Main Results:

  • CDK7 was expressed in 79.3% of PCa tissues, with higher levels in LNM, advanced/recurrent tumors, and DM compared to primary tumors.
  • CDK7 and pMED1 expression showed a strong positive correlation.
  • High CDK7 expression was significantly associated with shorter 5-year biochemical recurrence-free survival and reduced overall survival, independent of other prognostic factors.
  • High CDK7 and pMED1 levels correlated with nuclear AR expression, higher Ki67 indices, and more frequent ETS-related gene (ERG)-positive status.

Conclusions:

  • CDK7 is frequently expressed in human PCa and serves as a significant predictor of disease recurrence after radical prostatectomy (RP).
  • The CDK7/pMED1 axis is closely linked to AR activity and tumor aggressiveness.
  • Therapeutic inhibition of CDK7 presents a promising strategy for treating advanced prostate cancer.

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