OPN neutralization abrogates fibrogenesis in precision-cut liver slices (PCLS). Precision-cut, viable mouse liver slices (PCLS) (a liver organ culture system) were stimulated with leptin (or vehicle), in the presence of sham- or OPN-specific aptamers for 48 h. At the end of treatment, liver slices were harvested, viability assessed by ATP content, and RNA analyzed by qRTPCR. (A) ATP content (viability) in nmol/mg protein; hashed line denotes the accepted viability threshold. (B) OPN mRNA. (C) αSMA mRNA. (D) Collagen 1α1 mRNA. Results are expressed as fold changes relative to vehicle-treated PCLS, and graphed as mean ± SEM. *p < 0.05 vs. vehicle.