Collagen receptor cross-talk determines α-smooth muscle actin-dependent collagen gene expression in angiotensin II-stimulated cardiac fibroblasts — DDR2-Integrin-β1 cross-talk in collagen type I expression — Collagen receptor cross-talk determines α-smooth muscle actin-dependent collagen gene expression in angiotensin II–stimulated cardiac fibroblasts — DDR2–integrin-β1 cross-talk in collagen type I expression