Activation of AKT negatively regulates the pro-apoptotic function of death-associated protein kinase 3 (DAPK3) in prostate cancer

Trinath P. Das; Suman Suman; A.M. Sashi Papu John; Deeksha Pal; Angelena Edwards; Houda Alatassi; Murali K. Ankem; Chendil Damodaran

doi:10.1016/j.canlet.2016.04.028

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Activation of AKT negatively regulates the pro-apoptotic function of death-associated protein kinase 3 (DAPK3) in prostate cancer

Journal article

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Activation of AKT negatively regulates the pro-apoptotic function of death-associated protein kinase 3 (DAPK3) in prostate cancer

Trinath P. Das, Suman Suman, A.M. Sashi Papu John, Deeksha Pal, Angelena Edwards, Houda Alatassi, Murali K. Ankem and Chendil Damodaran

Cancer letters, Vol.377(2), pp.134-139

07/28/2016

DOI: 10.1016/j.canlet.2016.04.028

PMCID: PMC4884664

PMID: 27126362

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Abstract

•This is the first study that demonstrates the inverse correlation of AKT activation and down-regulation of tumor suppressor protein, DAPK-3, in CaP cell lines as well as human prostate tumor tissues that correlate with disease progression.•Either silencing AKT or overexpressing DAPK-3 induces apoptosis in Castration Resistant Prostate Cancer cells. The activation of AKT governs many signaling pathways and promotes cell growth and inhibits apoptosis in human malignancies including prostate cancer (CaP). Here, we investigated the molecular association between AKT activation and the function of death-associated protein kinase 3 (DAPK3) in CaP. An inverse correlation of pAKT and DAPK3 expression was seen in a panel of CaP cell lines. Inhibition of AKT by wortmannin/LY294002 or overexpression of DAPK3 reverts the proliferative function of AKT in CaP cells. On the other hand, ectopic expression of AKT inhibited DAPK3 function and induced proliferation of CaP cells. In addition, AKT over-expressed tumors exhibit aggressive growth when compared to control vector in xenograft models. The immunohistochemistry results revealed a down-regulation of DAPK3 expression in AKT over-expressed tumors as compared to control tumors. Finally, we examined the expression pattern of AKT and DAPK3 in human CaP specimens – the expected gradual increase and nuclear localization of pAKT was seen in higher Gleason score samples versus benign hyperplasia (BPH). On the contrary, reduced expression of DAPK3 was seen in higher Gleason stages versus BPH. This suggests that inhibition of DAPK3 may be a contributing factor to the carcinogenesis of the prostate. Understanding the mechanism by which AKT negatively regulates DAPK3 function may suggest whether DAPK3 can be a therapeutic target for CaP.

Molecular signaling

Oncogene

Progression

Prostate cancer

Tumor suppressor

Details

Title: Subtitle: Activation of AKT negatively regulates the pro-apoptotic function of death-associated protein kinase 3 (DAPK3) in prostate cancer
Creators: Trinath P. Das - University of Louisville
Suman Suman - University of Louisville
A.M. Sashi Papu John - University of Louisville
Deeksha Pal - University of Louisville
Angelena Edwards - University of Louisville
Houda Alatassi - University of Louisville
Murali K. Ankem - University of Louisville
Chendil Damodaran - University of Louisville
Resource Type: Journal article
Publication Details: Cancer letters, Vol.377(2), pp.134-139
DOI: 10.1016/j.canlet.2016.04.028
PMID: 27126362
PMCID: PMC4884664
NLM abbreviation: Cancer Lett
ISSN: 0304-3835
eISSN: 1872-7980
Publisher: Elsevier Ireland Ltd
Language: English
Date published: 07/28/2016
Academic Unit: Stead Family Department of Pediatrics; Urology
Record Identifier: 9984320075902771

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