PI3K-Akt signaling pathway plays a critical role in the regulation of cell proliferation,differentiation and apoptosis,and is closely related to the physiological function of cells and thus may cause certain diseases.The excessive activation of this pathway is found closely associated with the formation of drug resistance of tumors.Recent studies in vitro indicate that the combined chemotherapy drugs with PI3K-Akt signaling pathway inhibitors,can significantly enhance the efficiency of chemotherapy drug and lower the value of IC50.Therefore,PI3K-Akt signaling pathway has become an important target to inhibit tumor cell growth and reverse tumor drug resistance.

Objective:To investigate the dynamic expression of protein tyrosine phosphatase SHP2 in liver tissue of rats with carbon tetrachloride (CCl 4)-induced liver fibrosis. Methods:Rat liver fibrosis model was established by intraperitoneal injection of CCl 4. Rat liver tissue histopathological changes were detected by HE and Masson-trichrome staining. Immunohistochemical staining, Western blot and real-time fluorescent quantitative PCR were used to detect SHP2 protein and mRNA expression in rat liver tissue. One-way analysis of variance was used for the comparison of means between multiple groups, and the LSD test was used for further inter-group comparison. Results:CCl 4-induced rat liver fibrosis model was successfully constructed, and with the extension of modeling time, the degree of liver fibrosis in rats were aggravated gradually. Immunohistochemical staining results showed that SHP2 was mainly expressed in the cytoplasm of rat liver tissues. With the aggravation of liver fibrosis, the number of cells with positive expression of SHP2 was aggravated gradually ( P < 0.05). Western blot and real-time fluorescent quantitative PCR results showed that the expressions of SHP2 protein and mRNA in rat fibrotic liver tissues at different times in week 2, 4, 6, and 8 were higher in modeling than control group ( P < 0.05), and was aggravated gradually with the liver fibrosis aggravation ( P < 0.05). Conclusion:The expression of SHP2 protein and mRNA in the liver tissue of rats with CCl 4-induced liver fibrosis increased gradually with the degree of liver fibrosis, and the degree of increase was consistent with the degree of liver fibrosis.

Objective To understand the epidemiological characteristics and related risk factors on HIV,HBV infection of people from the southwest province of China and to provide basic data for the development of related strategies.Methods According to the information on current HIV epidemics,one township from the area was selected as the study field and all the adult population were surveyed using a questionnaire to collect social demographic data and information on infection-related factors.Results A total of 2 290 adults were investigated and data showed as follows:the average HIV infection rate as 7.9％,the average HBV infection rate as 3.1％,and the average HIV/HBV co-infection rate as 1.2％.As for HIV infection,people whose yearly family gross income between 1 000 and 3 000 Yuan (OR=0.28) or more than 5 000 Yuan (OR=0.14) were less likely to be infected with HIV than those people whose annual family gross income less than 1 000 Yuan.People with educational level of primary school and above were more likely to carry HIV than those who were illiterate (OR =3.28).People who had the history of migration were less likely to carry HIV than those who had not (OR=0.33).People who had the history of being drug abusers were more likely to infect HIV than those who had not (OR=46.32).People whose spouses had the history of using drugs were more likely to infect HIV than those who had not (OR=3.52).People whose spouses had been infected with HIV were more likely to infect HIV than those who had not (OR=9.56).As for HBV infection,people who had the history of migration were more likely to infect HBV (OR =2.48).As for HIV/HBV co-infection,people whose spouses had the history of HIV infection were more likely to infect HIV/HBV co-infection than others who did not have the history (OR=6.04).Conclusion There had been a serious HIV/AIDS epidemic in our study field.Other than taking measures as detection and vaccination on HBV,health education should be strengthened,together with measurements as needle exchange and methadone substitution therapy,to control the spread of AIDS.

Coinfection ; HIV Infections ; Humans ; Schistosomiasis