COL1A2 and Hepatic fibrosis: To confirm in vivo the therapeutic effects of hepatocyte targeting expression rIL-10 on liver fibrosis, in vitro we examined the expression of procollagen type I and α-SMA in HSCs co-cultured with BRL cells transfected with rIL-10 expression plasmid pcDNA3-rIL-10, null plasmid pcDNA3 or saline.