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Pull-down of PTP-tagged EIF4E2 from bloodstream-form Trypanosoma brucei

ABSTRACT: Pull-down of PTP-tagged EIF4E2 from bloodstream-form Trypanosoma brucei

PROVIDER: PRJEB46062 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR6178340.fastq.gz	Fastqsanger.gz
	ERR6178335.fastq.gz	Fastqsanger.gz
	ERR6178336.fastq.gz	Fastqsanger.gz
	ERR6178337.fastq.gz	Fastqsanger.gz
	ERR6178338.fastq.gz	Fastqsanger.gz

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Pull-down of PTP-tagged EIF4E2 from bloodstream-form Trypanosoma brucei

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Project description:Although the consequences of genotoxic injury include cell cycle arrest and apoptosis, cell survival responses after genotoxic injury can produce intrinsic death-resistance and contribute to the development of a transformed phenotype. Protein tyrosine phosphatases (PTPs) are integral components of key survival pathways, and are responsible for their inactivation, while PTP inhibition is are often associated with enhanced cell proliferation. Our aim was to elucidate signaling events that modulate cell survival after genotoxin exposure. Diploid human lung fibroblasts (HLF) were treated with Cr(VI) (as Na2CrO4), a well known human respiratory carcinogen that induces a wide spectrum of DNA damage, in the presence and absence of a broad-range PTP inhibitor, sodium orthovanadate. Notably, PTP inhibition abrogated Cr(VI)-induced clonogenic lethality. The enhanced survival of Cr(VI)-exposed cells after PTP inhibition was predominantly due to a bypass of cell cycle arrest and was not due to decreased Cr uptake as evidenced by unchanged Cr-DNA adduct burden. Additionally, the bypass of Cr-induced growth arrest by PTP inhibition, was accompanied by a decrease in Cr(VI)-induced expression of cell cycle inhibiting genes, and an increase in the Cr(VI)-induced expression of cell cycle promoting genes. Importantly, PTP inhibition resulted in an increase in forward mutations at the HPRT locus, supporting the hypothesis that PTP inhibition in the presence of DNA damage may lead to genomic instability, via bypass of cell cycle checkpoints.

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