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G0S2 inhibits the proliferation of K562 cells by interacting with nucleolin in the cytosol.

ABSTRACT: G0/G1 switch gene 2 (G0S2) is a basic protein with ill-defined function that inhibits the proliferation of hematopoietic stem cells. Herein, we show that treatment of K562 cells with 5-azacytidine (5-Aza) resulted in a 24-fold increase in G0S2 expression and a reduction in cell growth. Conversely, gene demethylation in the presence of G0S2-specific shRNA restored proliferation, further supporting an inhibitory role for G0S2 in cell proliferation. Elevated levels of G0S2 inhibited the division of K562 cells by sequestering the nucleolar phosphoprotein nucleolin in the cytosol. G0S2 inhibited the proliferation of leukemia cells in vivo in xenograft models. Collectively, our data identify a new mechanism that controls proliferation in K562 cells, suggesting a possible tumor suppressor function in leukemia cells.

SUBMITTER: Yamada T

PROVIDER: S-EPMC3946941 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature

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G0S2 inhibits the proliferation of K562 cells by interacting with nucleolin in the cytosol.

Yamada Takeshi T Park Chun Shik CS Shen Ye Y Rabin Karen R KR Lacorazza H Daniel HD

Leukemia research 20131014 2

G0/G1 switch gene 2 (G0S2) is a basic protein with ill-defined function that inhibits the proliferation of hematopoietic stem cells. Herein, we show that treatment of K562 cells with 5-azacytidine (5-Aza) resulted in a 24-fold increase in G0S2 expression and a reduction in cell growth. Conversely, gene demethylation in the presence of G0S2-specific shRNA restored proliferation, further supporting an inhibitory role for G0S2 in cell proliferation. Elevated levels of G0S2 inhibited the division of ...[more]

PMID: 24183236

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G0S2 modulates homeostatic proliferation of naive CD8⁺ T cells and inhibits oxidative phosphorylation in mitochondria.

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