The present invention provides methods, compositions, and systems for treating a subject at risk for, with, or suspected of having, myocardial ischemia using hepatocyte secretory factors (e.g., AGP2, BMPER, FGF21, NRG4, and/or TFF3) or using factors that promote liver cell migration to ischemic myocardial tissue (e.g., IL-6 and/or MMP-2).