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Objective To investigate the effect of overexpression of miR-30b on the proliferation,cell cycle,apoptosis and invasion of gastric cancer cell line SGC-7901 and AGS,and the inhibitory effect on the tumor formation in vivo.Methods SGC-7901 and AGS cells were transfected with miR-30b mimics and miR-control,and qRT-PCR was used to detect the expression levels of miR-30b.Western blot assay was used to detect the expression of eIFSA2 protein.CCK-8 assay was used to measure the cell proliferation.Flow cytometry was used to analyze cell cycle and apoptosis.Transwell assay was used to detect cell invasion.In addition,the SGC-7901 and AGS cells transfected with miR-30b mimics and miR-control were injected into nude mice to observe the tumor formation and the expression of eIFSA2 protein in vivo.Results Results of qRT-PCR showed that the relative expression of miR-30b was significantly higher than that of miR-control group (P ＜ 0.05).Western blot assay showed that the expression of eIF5A2 protein was decreased in miR-30b mimics group.CCK-8 assay showed that cell proliferation was inhibited in miR-30b mimics group.The result of flow cytometry showed that the cell cycle decreased and the apoptosis increased in miR-30b group.Transwell assay showed that the cell invasion was significantly lower in miR-30b group than that of control group (P ＜ 0.05).Overexpression of miR-30b inhibited the formation of tumor and decreased the expression of eIF5A2 protein in vivo.Conclusion Overexpression of miR-30b inhibits the proliferation,invasion and tumor formation of gastric cancer cells,and reduces the expression of eIF5A2 protein,which provides a potential target for gastric cancer treatment.
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Objective To detect the positive rates of antibodies against avian influenza virus (AIV) subtypes H5, H6, H7 and H9 among people in poultry occupations in Guangdong province and to analyze the transmission of various subtypes of AIV from poultry to human contacts for the prevention and control of novel AIV infection in human beings.Methods Serum specimens were collected from 1066 peo-ple in poultry occupations ( occupational group) and 205 people not in poultry occupations ( non-occupational group) in 10 cities of Guangdong province.The inactivated AIV strains, isolated from poultry or environment of Guangdong province, were used as antigens to detect antibodies against AIV subtypes H5, H6, H7 and H9 by using the hemagglutination inhibition ( HI) assay.Results The positive rates of antibodies against AIV subtypes H5, H6, H7 and H9 carried by people from the occupational group were respectively 0.44%, 0%, 0.30%and 0.30%in 2013 and 1.08%, 0.0%, 0.0%and 0.27%in 2014.Only the anti-H9 anti-bodies were detected in serum samples collected form people in the non-occupational group in 2013 with a positive rate of 0.95%.No significant differences with the positive rates of anti-AIV antibodies were found between the occupational group and the non-occupational group.However, the geometric mean titer ( GMT) of anti-AVI antibodies in people from the occupational group was higher than that of the non-occupational group.Conclusion Although a grand spread of AIV from avian to human is not likely to happen yet, con-tacting with poultry is the risk factor for AIV infection in Guangdong population.A long-term surveillance of anti-AIV antibodies in serum should be strengthened among people in poultry occupations for the timely pre-vention and control of novel AIV outbreak.