Chk1 (Phospho-Ser296) ELISA Kit

Background: Digestive system neoplasm is a common cancer in males worldwide. This study aimed to explore the commonalities in males with digestive system neoplasms (MDSN) and its clinical relevance. Methods: A total of 46 differential expressed genes (DEGs) in MDSN were identified shared in TCGA and GEO databases. Results: These DEGs significantly affected a variety of cell function and signaling pathways. Of which, a hub of 7 genes (CCNB1, MAD2L1, BUB1, CHEK1, MCM2, CCNA2 and CDC25B) were interacted with each other in protein level and significantly enriched in cell cycle pathway. Further methylation analysis, we found that BUB1, MAD2L1 and MCM2 were hypomethylation via m6A modification. Besides, BUB1, MAD2L1 and MCM2 were co-expressed in mRNA level and up-regulation of them led to worse prognostic in hepatocellular carcinoma, while caused a better prognostic in stomach adenocarcinoma (STAD), and had a race difference between white and Asian people in STAD. Medicine molecules, I-threonine (ID: PA451673) and enzymes (ID: PA164712734) might be efficient medicines in BUB1, MAD2L1 and MCM2 up-regulated MDSN patients. Conclusions: Taken together, hypomethylation via m6A modification might cause BUB1, MAD2L1 and MCM2 up-regulation in MDSN. Dysregulation of BUB1, MAD2L1 and MCM2 function as contrast prognostic in liver hepatocellular carcinoma and STAD. Our study provides more accurate therapeutic targets and prognostic biomarkers for specific cancer types.

Cell cycle checkpoints ensure that eukaryotic cells do not enter mitosis after ionizing irradiation (IR). The G(2)-arrest after IR is the result of activation of multiple signalling pathways, the contributions of which vary with time after irradiation. We have studied the time evolution of the IR-induced G(2)-arrest in human B-lymphocyte cancer cell lines, as well as the molecular mechanisms responsible for the arrest. Cells that were in G(2) phase at the time of irradiation experienced a transient arrest that blocked entry into mitosis at 0-2 hours after IR (0.5 or 4 Gy). Activation of ATM and CHEK2 occurred at the same time as this early arrest and was, like the arrest, abrogated by the ATM-inhibitor KU-55933. A late, permanent and ATM-independent arrest (>= 6 hours after IR) of cells that were in G(2)/S/G(1) at the time of irradiation (4 Gy) was inactivated by caffeine. This late G(2)-arrest could not be explained by downregulation of genes with functions in G(2)/mitosis (e.g., PLK1, CCNB1/2), since the downregulation was transient and not accompanied by reduced protein levels. However, the persistent phosphorylation of CHEK1 after 4 Gy suggested a role for CHEK1 in the late arrest, consistent with the abrogation of the arrest in CHEK1-depleted cells. TP 53 was not necessary for the late G(2)-arrest, but mediated an intermediate arrest (2-10 hours after IR) independently of ATM and CHEK1. In conclusion, the IR-induced arrest in G(2) is mediated by ATM immediately after irradiation, with TP 53 for independent and transient back-up, while CHEK1 is necessary for the late arrest.