Abstract:
:The identification of SYK as a molecular target in B-lineage leukemia/lymphoma cells prompted the development of SYK inhibitors as a new class of anti-cancer drug candidates. Here we report that induction of the SYK gene expression in human cells causes a significant down-regulation of evolutionarily conserved genes associated with mitosis and cell cycle progression providing unprecedented evidence that SYK is a master regulator of cell cycle regulatory checkpoint genes in human cells. We further show that SYK regulates the G2 checkpoint by physically associating with and inhibiting the dual-specificity phosphatase CDC25C via phosporylation of its S216 residue. SYK depletion by RNA interference or treatment with the chemical SYK inhibitor prevented nocodazole-treated human cell lines from activating the G2 checkpoint via CDC25C S216-phoshorylation and resulted in polyploidy. Our study provides genetic and biochemical evidence that spleen tyrosine kinase (SYK) has a unique role in the activation of the G2 checkpoint in both nonlymphohematopoietic and B-lineage lymphoid cells. This previously unknown role of SYK as a cell cycle checkpoint regulator represents an unforeseen and significant challenge for inhibitors of SYK ATP binding site.
journal_name
EBioMedicinejournal_title
EBioMedicineauthors
Uckun FM,Ma H,Ozer Z,Goodman P,Zhang J,Qazi Sdoi
10.1016/j.ebiom.2014.10.019subject
Has Abstractpub_date
2014-11-01 00:00:00pages
16-28issue
1issn
2352-3964journal_volume
1pub_type
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