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Akt Kinase-Interacting Protein 1 Signals through CREB to Drive Diffuse Malignant Mesothelioma

Tadaaki Yamada1, Joseph M Amann2, Koji Fukuda3

  • 1Department of Internal Medicine, The Ohio State University Medical Center, Columbus, Ohio. Division of Medical Oncology, Cancer Research Institute, Kanazawa University, Kanazawa, Japan.

Cancer Research
|August 22, 2015
PubMed

Insights

Targeting Akt kinase interacting protein 1 (Aki1) shows promise for diffuse malignant mesothelioma (DMM). Aki1 silencing reduced DMM cell viability and tumor growth, suggesting Aki1 as a therapeutic target for this cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Diffuse malignant mesothelioma (DMM) is a rare cancer of serosal membranes with poor prognosis.
  • Current treatments for DMM are largely ineffective, necessitating novel therapeutic strategies.
  • Akt kinase interacting protein 1 (Aki1) is implicated in signaling pathways but its role in DMM is unexplored.

Purpose of the Study:

  • To investigate the therapeutic potential of targeting Aki1 in diffuse malignant mesothelioma.
  • To elucidate the role of the Aki1-CREB axis in DMM pathogenesis.
  • To evaluate Aki1 as a target for novel DMM therapies.

Main Methods:

  • Cell-based assays were used to assess the effects of Aki1 silencing on DMM cell viability and cell-cycle progression.
  • The involvement of the PKA-CREB1 signaling pathway was investigated.
  • Aki1 expression was analyzed in human DMM specimens.
  • A therapeutic efficacy study was conducted using an orthotopic DMM mouse model with intrathoracic administration of Aki1 siRNA.

Main Results:

  • Aki1 silencing significantly decreased DMM cell viability and induced cell-cycle arrest.
  • The effects of Aki1 silencing were mediated through the PKA-CREB1 signaling pathway.
  • Aki1 expression was detected in most human DMM samples and correlated with phosphorylated CREB1.
  • Intrathoracic administration of Aki1 siRNA effectively inhibited tumor growth in a DMM mouse model.

Conclusions:

  • The Aki1-CREB axis plays a crucial role in the pathogenesis of diffuse malignant mesothelioma.
  • Aki1 represents a promising therapeutic target for DMM.
  • Intrathoracic delivery of Aki1-targeting agents warrants further investigation for locally advanced DMM.

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