Objective:Hepatocellular carcinoma(HCC)is a severely lethal cancer that usually originates from chronic liver injury and inflammation.Although progress on diagnosis and treatment is obvious,the cause of HCC remains un...Objective:Hepatocellular carcinoma(HCC)is a severely lethal cancer that usually originates from chronic liver injury and inflammation.Although progress on diagnosis and treatment is obvious,the cause of HCC remains unclear.In this study,we sought to determine key genes in HCC development.Methods:To identify key regulators during HCC progression,we performed transcriptome sequencing to obtain time series gene expression data from a mouse model with diethylnitrosamine-induced liver tumors and further verified gene expression and function in vitro and in vivo.Results:Among the differentially expressed genes,Cyp2c29 was continuously downregulated during HCC progression.Overexpression of Cyp2c29 suppressed N F-kB activation and proinflammatory cytokine production by increasing the production o f 14,15-epoxyeicosatrienoic acid in vitro.Furthermore,overexpression of Cyp2c29 in vivo protected against liver inflammation in mouse models of liver injury induced by both acetaminophen and CC14.Two human homologs of mouse Cyp2c29,CYP2C8 and CYP2C9,were found to be downregulated in human HCC progression,and their expression was positively correlated with overall survival in patients with HCC(significance:P=0.046 and 0.0097,respectively).Conclusions:Collectively,through systematic analysis and verification,we determined that C yp2c29 is a novel gene involved in liver injury and inflammation,which may be a potential biomarker for HCC prevention and prognosis determination.展开更多
Objective: To establish a fluoregenic probe quantitative RT-PCR (FQ-RT-PCR) method for detection of the expression of MDR1 gene in tumor cells and to investigate the expression of MDR1 gene in patients with lung cance...Objective: To establish a fluoregenic probe quantitative RT-PCR (FQ-RT-PCR) method for detection of the expression of MDR1 gene in tumor cells and to investigate the expression of MDR1 gene in patients with lung cancer. Methods: The fluorogenic quantitative RT-PCR method for detection of the expression of MDR1 gene was established. K562/ADM and K562 cell lines or 45 tumor tissues from patients with lung cancer were examined on PE Applied Biosystems 7700 Sequence Detection machine. Results: the average levels of MDR1 gene expression in K562/ADM cells and K562 cells were (6.86±0.65)× 107 copies/μg RNA and (8.49±0.67)×105 copies/μg RNA, respectively. The former was 80.8 times greater than the latter. Each sample was measured 10 times and the coefficient variation (CV) was 9.5% and 7.9%, respectively. Various levels of MDR1 gene expression were detected in 12 of 45 patients with lung cancer. Conclusion: Quantitative detection of MDR1 gene expression in tumor cells was achieved by using FQ-RT-PCR. FQ-RT-PCR is an accurate, and sensitive method and easy to perform. Using this method, low levels of MDR1 gene expression could be detected in 24% of the patients with lung cancer.展开更多
To investigate the molecular aspects of osteoblastic interactions with β tricalcium phosphate （β-TCP） particles, human osteoblast-like MG-63 cells were cultured with β-TCP particles at a density of 6 mg/mL cultur...To investigate the molecular aspects of osteoblastic interactions with β tricalcium phosphate （β-TCP） particles, human osteoblast-like MG-63 cells were cultured with β-TCP particles at a density of 6 mg/mL culture medium for 48 h. Then, the mRNA expression of selected genes were quantified by real-time polymerase chain reaction （PCR）, including the attachment-related genes （α integrin and actin）, the proliferation-related gene （c-jun）, and the osteoblastic markers genes （type I collagen, osteonectin, alkaline phosphatase, RUNX2 and osteoclain）. The results showed that β-TCP particles （the average size 809 nm） significantly promote the attachment and the proliferation of MG-63 cells, and slightly enhance the osteoblastic differentiation based on the analyses of the related genes expression. This study provided scientific evidences to better reveal the underlines of functions of β-TCP in bone repair.展开更多
We consider a modified Markov branching process incorporating with both state-independent immigration-migration and resurrection. The effect of state-independent immigration-migration is firstly in- vestigated in deta...We consider a modified Markov branching process incorporating with both state-independent immigration-migration and resurrection. The effect of state-independent immigration-migration is firstly in- vestigated in detail. The explicit expressions for the extinction probabilities and mean extinction times are presented. The ergodicity and stability properties of the process incorporating with resurrection structure are then investigated. The conditions for recurrence, ergodicity and exponential ergodicity are obtained. An explicit expression for the equilibrium distribution is also presented. As a preparation, the criteria for regularity and uniqueness for such structure are firstly established.展开更多
基金grants from The National Key Research and Development Program of China(Grant No.2017YFA0700403)National Natural Science Foundation of China(Grant Nos.81573013,31822030,and 31771458)National Basic Research Program of China(Grant No.2018YFA0208903).
文摘Objective:Hepatocellular carcinoma(HCC)is a severely lethal cancer that usually originates from chronic liver injury and inflammation.Although progress on diagnosis and treatment is obvious,the cause of HCC remains unclear.In this study,we sought to determine key genes in HCC development.Methods:To identify key regulators during HCC progression,we performed transcriptome sequencing to obtain time series gene expression data from a mouse model with diethylnitrosamine-induced liver tumors and further verified gene expression and function in vitro and in vivo.Results:Among the differentially expressed genes,Cyp2c29 was continuously downregulated during HCC progression.Overexpression of Cyp2c29 suppressed N F-kB activation and proinflammatory cytokine production by increasing the production o f 14,15-epoxyeicosatrienoic acid in vitro.Furthermore,overexpression of Cyp2c29 in vivo protected against liver inflammation in mouse models of liver injury induced by both acetaminophen and CC14.Two human homologs of mouse Cyp2c29,CYP2C8 and CYP2C9,were found to be downregulated in human HCC progression,and their expression was positively correlated with overall survival in patients with HCC(significance:P=0.046 and 0.0097,respectively).Conclusions:Collectively,through systematic analysis and verification,we determined that C yp2c29 is a novel gene involved in liver injury and inflammation,which may be a potential biomarker for HCC prevention and prognosis determination.
基金a grant from the National New Technology Program (No. 1998-345).
文摘Objective: To establish a fluoregenic probe quantitative RT-PCR (FQ-RT-PCR) method for detection of the expression of MDR1 gene in tumor cells and to investigate the expression of MDR1 gene in patients with lung cancer. Methods: The fluorogenic quantitative RT-PCR method for detection of the expression of MDR1 gene was established. K562/ADM and K562 cell lines or 45 tumor tissues from patients with lung cancer were examined on PE Applied Biosystems 7700 Sequence Detection machine. Results: the average levels of MDR1 gene expression in K562/ADM cells and K562 cells were (6.86±0.65)× 107 copies/μg RNA and (8.49±0.67)×105 copies/μg RNA, respectively. The former was 80.8 times greater than the latter. Each sample was measured 10 times and the coefficient variation (CV) was 9.5% and 7.9%, respectively. Various levels of MDR1 gene expression were detected in 12 of 45 patients with lung cancer. Conclusion: Quantitative detection of MDR1 gene expression in tumor cells was achieved by using FQ-RT-PCR. FQ-RT-PCR is an accurate, and sensitive method and easy to perform. Using this method, low levels of MDR1 gene expression could be detected in 24% of the patients with lung cancer.
基金National Natural Science Foundation of China(No.81190133)Self-Determined and Innovation Research Funds of WUT(No.2012-IV-069)
文摘To investigate the molecular aspects of osteoblastic interactions with β tricalcium phosphate （β-TCP） particles, human osteoblast-like MG-63 cells were cultured with β-TCP particles at a density of 6 mg/mL culture medium for 48 h. Then, the mRNA expression of selected genes were quantified by real-time polymerase chain reaction （PCR）, including the attachment-related genes （α integrin and actin）, the proliferation-related gene （c-jun）, and the osteoblastic markers genes （type I collagen, osteonectin, alkaline phosphatase, RUNX2 and osteoclain）. The results showed that β-TCP particles （the average size 809 nm） significantly promote the attachment and the proliferation of MG-63 cells, and slightly enhance the osteoblastic differentiation based on the analyses of the related genes expression. This study provided scientific evidences to better reveal the underlines of functions of β-TCP in bone repair.
基金supported by National Natural Science Foundations of China (Grant Nos. 10771216 and 11071259)
文摘We consider a modified Markov branching process incorporating with both state-independent immigration-migration and resurrection. The effect of state-independent immigration-migration is firstly in- vestigated in detail. The explicit expressions for the extinction probabilities and mean extinction times are presented. The ergodicity and stability properties of the process incorporating with resurrection structure are then investigated. The conditions for recurrence, ergodicity and exponential ergodicity are obtained. An explicit expression for the equilibrium distribution is also presented. As a preparation, the criteria for regularity and uniqueness for such structure are firstly established.
