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  • Original Paper
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Chromatin remodeling factor encoded by ini1 induces G1 arrest and apoptosis in ini1-deficient cells

Abstract

Ini1/hsnf5 gene encodes INI1 protein, a chromatin remodeling factor associated with the SWI/SNF complex. In yeast, this complex modifies chromatin condensation to coactivate various transcriptional factors. However, in human, little is known about the SWI/SNF complex and INI1. To elucidate cellular functions of ini1, we constructed a recombinant adenovirus (AdexHA-INI1) capable of overexpressing INI1 in ini1-deficient cells. AdexHA-INI1 produced intranuclear INI1 in three ini1-deficient cell lines, changed their morphology, and decreased the proportion of viable cells. Flow cytometry and a BrdU incorporation assay showed that after the infection, growth of these cells was partially arrested at G1. In two of the three ini1-deficient cell lines, apoptosis was found to occur after the infection, as detected by the presence of cleaved poly (ADP-ribose) polymerase. To determine functional domains of INI1, we constructed plasmids expressing INI1 and its deletion mutants, which were used for a colony formation assay. Repeats 1 and 2 of INI1 were found to be required to suppress the growth of the three ini1-deficient cell lines. The results support the hypothesis that ini1 is a tumor suppressor gene and suggest a novel link between human SWI/SNF chromatin remodeling complex and apoptosis.

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Abbreviations

MRT:

malignant rhabdoid tumor

PARP:

poly (ADP-ribose) polymerase

MOI:

multiplicity of infection

CPE:

cytopathic effect

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Acknowledgements

We thank Yasuhide Hayashi (Department of Pediatrics, University of Tokyo) for KYM-1 and TM87-16 cells. We are grateful to Tadahito Kanda, Aikichi Iwamoto, Tetsuya Nakamura, Takashi Odawara (DID, IMS UT), Kunito Yoshiike (National Institute of Health, Thailand), and Hiroshi Yoshikura (NIID) for critical reading of the manuscript. This work was supported by grants to Y Kitamura from the Ministry of Health, Labour and Welfare; the Japan Human Sciences Foundation; and the Ministry of Education, Culture, Sports, Science and Technology Agency. K Ae is a recipient of a Resident Fellowship from the Japanese Foundation for AIDS Prevention.

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Correspondence to Yoshihiro Kitamura.

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Ae, K., Kobayashi, N., Sakuma, R. et al. Chromatin remodeling factor encoded by ini1 induces G1 arrest and apoptosis in ini1-deficient cells. Oncogene 21, 3112–3120 (2002). https://doi.org/10.1038/sj.onc.1205414

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