2015
DOI: 10.18632/oncotarget.3989
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Tumor promotion by γ and suppression by β non-muscle actin isoforms

Abstract: Here we have shown that β-cytoplasmic actin acts as a tumor suppressor, inhibiting cell growth and invasion in vitro and tumor growth in vivo. In contrast, γ-cytoplasmic actin increases the oncogenic potential via ERK1/2, p34-Arc, WAVE2, cofilin1, PP1 and other regulatory proteins. There is a positive feedback loop between γ-actin expression and ERK1/2 activation. We conclude that non-muscle actin isoforms should not be considered as merely housekeeping proteins and the β/γ-actins ratio can be used as an oncog… Show more

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Cited by 51 publications
(93 citation statements)
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“…Recent work has specifically implicated the g-actin isoform as a tumor promotor. 2 Further insight into the etiology behind this activity is provided in the present work by Po'uha and Kavallaris. 3 Acto-myosin is widely celebrated for its role in conducting the final bars of the mitotic symphony: cytokinesis.…”
mentioning
confidence: 77%
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“…Recent work has specifically implicated the g-actin isoform as a tumor promotor. 2 Further insight into the etiology behind this activity is provided in the present work by Po'uha and Kavallaris. 3 Acto-myosin is widely celebrated for its role in conducting the final bars of the mitotic symphony: cytokinesis.…”
mentioning
confidence: 77%
“…Consistent with this, is the observation that overexpression of g-actin, but not b-actin, accelerates cell proliferation. 2 As hypothesized above, g-actin-dependent acceleration of proliferation could arise from an acceleration of centrosome disjunction, licensing and maturation utilizing g-actin filament mechanics. Alternatively, g-actin filaments may serve as a scaffold for second messenger signaling, such as the activation of ERK1/2, 2 whose many downstream effects might accelerate the cell cycle.…”
mentioning
confidence: 94%
“…Также было проверено влияние изменения соотношения изоформ на рост подкожных опухолевых ксенографтов. Функциональные данные подтвердили наши предположения о роли β-актина в поддержа-нии нормального фенотипа и противоположной роли γ-актина в усилении неопластических свойств [76]. Реорганизация системы актиновых филаментов игра-ет важную роль при неопластической трансформации клеток.…”
Section: функции изоформ актинаunclassified
“…Реорганизация системы актиновых филаментов игра-ет важную роль при неопластической трансформации клеток. Мы обнаружили, что изменение соотношения β-и γ-цитоплазматических актинов в клетках карци-ном легкого и толстой кишки человека: 1) характерно как для клеток, растущих in vitro, так и для тканевых опухолевых образцов; 2) напрямую связано с онкоген-ными свойствами и ростом опухолевых ксенографтов [76]. Повышение относительного уровня экспрессии β-актина ингибировало проявление онкогенного фенотипа и опухолевый рост, тогда как повышение экспрессии γ-актина усиливало онкогенный потен-циал путем взаимодействия с регуляторными белками ERK1 / 2, p34-Arc, WAVE2, кофилином 1 и PP1.…”
Section: функции изоформ актинаunclassified
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