RESUMO
Diacylglycerol kinase zeta (DGKZ) is associated with the pathogenesis of a variety of malignant diseases, but its biological function on acute myeloid leukemia (AML) has not been explored. The aim of this study was to analyze apoptosis induced by knockdown of DGKZ and its mechanism in human acute myeloid leukemia HL-60 cells. qRT-PCR was carried out to detect the expression of DGKZ in HL-60, THP-1, Jurkat, K562, and CD34 cell lines. Additionally the expression of DGKZ in AML cells obtained from patients were detected by qRT-PCR. Cell Counting Kit-8 (CCK-8) assay was used to determine the viability of HL-60 cells DGKZ knocked down. Apoptosis and cell cycle phase of HL-60 cells after DGKZ knockdown were evaluated by flow cytometry. Western blot analysis was performed to investigate expressions of the proteins related to apoptosis and cell cycle. Results showed that expression of DGKZ was significantly higher in HL-60 and AML cells obtained from patients than those of Jurkat, THP-1, K562 and human CD34 cell. Compared with the shCtrl group, DGKZ was markedly knocked down in HL-60 cells transfected with lentivirus encoding shRNA. DGKZ knockdown significantly inhibited the proliferation and induced cycle arrest at the G2/M phase in HL-60 cells. The expressions of MAPK, caspase-3, caspase-8, cytochrome C markedly increased and p-MAPK and survivin decreased in HL-60 cells after DGKZ knockdown. The results suggest that knockdown of DGKZ can induce apoptosis and G2/M phase arrest in human acute myeloid leukemia HL-60 cells through the MAPK/survivin/caspase pathway.
Assuntos
Apoptose/genética , Diacilglicerol Quinase/genética , Leucemia Mieloide Aguda/genética , Caspases/metabolismo , Linhagem Celular Tumoral , Proliferação de Células/genética , Pontos de Checagem da Fase G2 do Ciclo Celular/genética , Técnicas de Silenciamento de Genes , Células HL-60 , Humanos , Leucemia Mieloide Aguda/patologia , Pontos de Checagem da Fase M do Ciclo Celular/genética , Sistema de Sinalização das MAP Quinases/genética , RNA Interferente Pequeno/genética , Survivina/metabolismoRESUMO
IARS2 encodes mitochondrial isoleucine-tRNA synthetase, which mutation may cause multiple diseases. However, the biological function of IARS2 on acute myeloid leukemia (AML) has not yet been identified. In the present study, qRT-PCR was used to determine the expression of IARS2 in K562, THP1, and HL-60 leukemia cells. Additionally the mRNA levels of IARS2 in CD34 cells and AML cells obtained from patients were detected by qRT-PCR. IARS2-shRNA lentiviral vector was established and used to infect acute myeloid leukemia HL-60 cells. qRT-PCR and Western blot analysis were employed to assess the knockdown effect of IARS2. The proliferation rate and cell cycle phase of HL-60 cells after IARS2 knockdown were evaluated by CCK-8 assay and flow cytometry. The PathScan Antibody Array was used to determine the expression of cell cycle-related proteins in HL-60 cells after IARS2 knockdown. The expression of proliferation-related proteins in HL-60 cells after IARS2 knockdown was determined by Western blot analysis. Results showed that IARS2 expression was stable and much higher in HL-60, THP-1, and K562 leukemia cells and AML cells obtained from patients than that of human CD34 cells. Compared with cells of the shCtrl group, IARS2 was markedly knocked down in cells that were transfected with lentivirus encoding shRNA of IARS2 in HL-60 cells (p < 0.05). IARS2 knockdown significantly inhibited the proliferation and induced cycle arrest at the G1 phase in HL-60 cells. Additionally IARS2 knockdown significantly increased the expression of p53 and p21, and decreased the expression of PCNA and eIF4E in HL-60 cells. In conclusion, IARS2 knockdown can inhibit acute myeloid leukemia HL-60 cell proliferation and cause cell cycle arrest at the G1 phase by regulating the p53/p21/PCNA/eIF4E pathways.