Abstract: The present invention relates to the identification of a novel biomarker for cardiac ischemia: nitrated cardiac troponin I. The present invention also provides methods for the identification and use of a nitrated cardiac troponin as a biomarker for the diagnosis, prognosis and treatment management of myocardial ischemia, with and without necrosis of heart muscle. Diagnosis and prognosis is conducted by determining the amount of nitrated cardiac troponin I in serum samples of subjects and the ratio of nitrated cardiac troponin I to non-nitrated cardiac troponin I in serum samples of subjects. This biomarker can be detected by immunoassay techniques and tandem mass spectrometry. The present invention further relates to peptides, antibodies, compositions, methods, techniques, tests and kits for the identification and quantification of nitrated cardiac troponin I in samples of subjects.

Abstract: A peptide identified from the annexin V protein sequence and having the ability to modulate the activity of delta protein kinase C (PKC) is described. The peptide and variants thereof bind to delta PKC and are effective to regulate delta PKC mediated cellular responses. In particular the annexin V peptide is able to inhibit protein-protein interaction with delta PKC, blocking intracellular translocation of delta PKC. Inhibition of delta PKC translocation confers protection to tissue at risk of exposure to ischemia or hypoxia or to reperfusion injury.