Arrest Defective 1 Autoacetylation Is a Critical Step in Its Ability to Stimulate Cancer Cell Proliferation

NeuroVascular Coordination Research Center, College of Pharmacy, Seoul National University, Seoul 151-742, Korea.
Cancer Research (Impact Factor: 9.33). 06/2010; 70(11):4422-32. DOI: 10.1158/0008-5472.CAN-09-3258
Source: PubMed


The N-acetyltransferase arrest defective 1 (ARD1) is an important regulator of cell growth and differentiation that has emerged recently as a critical molecule in cancer progression. However, the regulation of the enzymatic and biological activities of human ARD1 (hARD1) in cancer is presently poorly understood. Here, we report that hARD1 undergoes autoacetylation and that this modification is essential for its functional activation. Using liquid chromatography-tandem mass spectrometry and site-directed mutational analyses, we identified K136 residue as an autoacetylation target site. K136R mutation abolished the ability of hARD1 to promote cancer cell growth in vitro and tumor xenograft growth in vivo. Mechanistic investigations revealed that hARD1 autoacetylation stimulated cyclin D1 expression through activation of the transcription factors beta-catenin and activator protein-1. Our results show that hARD1 autoacetylation is critical for its activation and its ability to stimulate cancer cell proliferation and tumorigenesis.

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    • "Our study's finding that the function of hARD1 can be influenced by nuclear translocation suggests a possible explanation for the inconsistent and variable behaviors of hARD1. Another possibility can be autoacetylation of hARD1, which contributes to its functional activation in cell proliferation [22]. In addition, our group previously suggested that ARD1 variants in mouse and human cells may serve different roles [4]. "
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