Fatty acid synthase interacts with signal transducer and activator of transcription 3 to promote migration and invasion in liver cancer cells / 中华肝脏病杂志

Objective@#Hepatocellular carcinoma (HCC) is one of the most common malignant tumor worldwide. Metastasis is a marker of cancer deterioration in patients with liver cancer and a major cause of death. In order to develop effective therapeutic strategies, it is urgent to study the molecular basis of liver cancer metastasis.@*Methods@#Immunohistochemistry was used to detect the expression of fatty acid synthase (FASN) in HCC. Wound healing and transwell cell invasion assays was used to confirm the role of FASN in liver cancer migration and invasion. Proteins that interacted with FASN were identified using iTRAQ (isobaric tag for relative and absolute quantification). Co-immunoprecipitation (Co-IP) and cellular immunofluorescence analysis were used to assess the interaction between FASN and signal transduction and transcription activator 3 (STAT3). The expression of STAT3, p-STAT3, matrix metalloproteinase (MMP)-2 and MMP-9 was detected after FASN knockdown using Western blot method. Statistical analysis was performed using the t-test.@*Results@#Immunohistochemistry showed that the expression of FASN in HCC tissue was higher than that in adjacent tissues. iTRAQ, Co-IP and immunofluorescence analysis revealed that FASN interacted with STAT3. Western blot analysis showed that the expression of p-STAT3, MMP-2 and MMP-9 decreased after FASN knockdown.@*Conclusion@#FASN may promote the metastasis of liver cancer by interacting with STAT3 and affecting the expression of MMP-2/MMP-9.

Prevalence of pre-existing direct-acting antiviral agents resistance-associated variants in genotype 1 HCV/HIV co-infected patients / 上海交通大学学报（医学版）

Objective·To investigate the prevalence of pre-existing direct-acting antiviral agents (DAAs) resistance associated variants (RAVs) in genotype 1 hepatitis C virus (HCV)/human immunodeficiency virus (HIV) co-infected patients.Methods·All NS3 and NSSB HCV sequences in genotype 1 HCV/HIV co-infected patients were retrieved from NCBI GenBank database.And sequences were aligned and analyzed using software MEGA 5.0.Results·In total,the overall prevalence of DAAs RAVs in NS3 region was high (26.06％ and 38.18％,respectively),no matter in genotype 1a or genotype 1b.In genotype 1a,the high prevalence of RAVs mainly presented in the position Q80 (8.45％).In genotype lb,S122 RAV was most observed (36.36％).It is worth noting that,RAVs in NS5B region were rare observed (0.77％) in this study,especially as no RAV was detected in any sequence of genotype 1a patients.Conclusion·The prevalence of pre-existing RAVs is high in NS3 region but rare in NS5B region in HCV/HIV co-infected patients,suggesting that NS5B inhibitors based combination regions are a better choice for HCV/HIV co-infected patients.