DARPP-32 and t-DARPP promote non-small cell lung cancer growth through regulation of IKKα-dependent cell migration

Communications Biology
Sk Kayum AlamLuke H Hoeppner

Abstract

Lung cancer is the leading cause of cancer-related death worldwide. Here we demonstrate that elevated expression of dopamine and cyclic adenosine monophosphate-regulated phosphoprotein, Mr 32000 (DARPP-32) and its truncated splice variant t-DARPP promote lung tumor growth, while abrogation of DARPP-32 expression in human non-small cell lung cancer (NSCLC) cells reduces tumor growth in orthotopic mouse models. We observe a novel physical interaction between DARPP-32 and inhibitory kappa B kinase-α (IKKα) that promotes NSCLC cell migration through non-canonical nuclear factor kappa-light-chain-enhancer of activated B cells 2 (NF-κB2) signaling. Bioinformatics analysis of 513 lung adenocarcinoma patients reveals elevated t-DARPP isoform expression is associated with poor overall survival. Histopathological investigation of 62 human lung adenocarcinoma tissues also shows that t-DARPP expression is elevated with increasing tumor (T) stage. Our data suggest that DARPP-32 isoforms serve as a negative prognostic marker associated with increasing stages of NSCLC and may represent a novel therapeutic target.

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Citations

Nov 6, 2020·Cancers·Paweł SobczukAgnieszka Cudnoch-Jędrzejewska
May 16, 2021·Journal of Cellular and Molecular Medicine·Behnaz SaidySarah J Storr

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Methods Mentioned

BETA
nuclear translocation
co-immunoprecipitation
xenograft
ubiquitination
transfection
flow cytometry
electrophoresis
protein
Immunoprecipitation
confocal microscopy

Software Mentioned

GraphPad Prism
Bruker
ImageJ
Xena

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