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Article
Nature Genetics  18, 111 - 117 (1998)
doi:10.1038/ng0298-111

Suppression of aggregate formation and apoptosis by transglutaminase inhibitors in cells expressing truncated DRPLA protein with an expanded polyglutamine stretch

Shuichi Igarashi1, Reiji Koide1, Takayoshi Shimohata1, Mitsunori Yamada2, Yasuko Hayashi1, 2, Hiroki Takano1, Hidetoshi Date1, Mutsuo Oyake1, Toshiya Sato1, Aki Sato1, Shigekimi Egawa2, Takeshi Ikeuchi1, Hajime Tanaka1, Ryoichi Nakano1, Keiko Tanaka1, Isao Hozumi1, Takashi Inuzuka1, Hitoshi Takahashi2 & Shoji Tsuji1, 3

  1Departments of Neurology, Brain Research Institute, Niigata University, 1-757 Asahimachi Niigata 951, Japan.

  2Departments of Pathology, Brain Research Institute, Niigata University, 1-757 Asahimachi Niigata 951, Japan.

  3e-mail: tsuji@cc.niigata-u.ac.jp

To elucidate the molecular mechanisms whereby expanded polyglutamine stretches elicit a gain of toxic function, we expressed full-length and truncated DRPLA (dentatorubral-pallidoluysian atrophy) cDNAs with or without expanded CAG repeats in COS-7 cells. We found that truncated DRPLA proteins containing an expanded polyglutamine stretch form filamentous peri- and intranuclear aggregates and undergo apoptosis. The apoptotic cell death was partially suppressed by the transglutaminase inhibitors cystamine and monodansyl cadaverine (but not putrescine), suggesting involvement of a transglutaminase reaction and providing a potential basis for the development of therapeutic measures for CAG-repeat expansion diseases.

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EISSN: 1546-1718
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