The present invention relates to a modulator, in particular an inhibitor, of microRNA-24 (miR-24) and to direct and indirect miR-24 targets for use in a method of treatment and/or prevention of ischemia, in a method of prevention of endothelial apoptosis or in a method of induction of angiogenesis. The present invention further relates to a precursor of miR-24 and to siRNAs or shRNAs against direct or indirect miR-24 targets for use in a method of treatment of angiogenesis associated with cancer. The present invention also relates to an in vitro method for diagnosing ischemia or prevalence or disposition for ischemia, and to a method for identifying a modulator of miR-24 and/or direct or indirect miR-24 targets. In addition, the present invention relates to pharmaceutical compositions or kits comprising any of the above agents, to endothelial cells devoid of expressing functional miR-24, and to a non-human, transgenic animal comprising these endothelial cells.