Protein abundance (by Western blot) of pro-MMP-2/β-actin ratios (A, n = 8) and MMP-2/β-actin ratios (B, n = 8) in livers of male Sprague-Dawley rats and representative Western blots of pro-MMP-2, MMP-2, and β-actin before (pre-) and after 4 h of saline infusion (post-saline), or euglycemic hyperinsulinemic clamping without (post-ins) or with lipid-heparin (post-ins+lip). MMP, matrix metalloproeinase. Shown are means ± SE. C: a representative gelatin zymogram and the mean ± SE of 4 zymograms of MMP-2 in rat liver pre- and 4 h post-saline or euglycemic hyperinsulinemic clamping without and with lipid-heparin. D: mean ± SE of 18S rRNA-normalized MMP-2 mRNA measurements in rat liver (n = 4).