- Contractile responsiveness of ventricular myocytes to isoproterenol is regulated by induction of nitric oxide synthase activity in cardiac microvascular endothelial cells in heterotypic primary culture. Ungureanu-Longrois, D., Balligand, J.L., Okada, I., Simmons, W.W., Kobzik, L., Lowenstein, C.J., Kunkel, S.L., Michel, T., Kelly, R.A., Smith, T.W. Circ. Res. (1995)