Safingol hydrochloride (L-threo-dihydrosphingosine hydrochloride) is a specific inhibitor of protein kinase C. It induces autophagy in solid tumor cells and cancer cell death by inhibiting the PKC and PI3-kinase pathways.

Synthetic peptide analog of bovine myelin basic protein (MBP). Non-competitive inhibitor of PKC (IC50 = 28 - 62 mM).

Selective cell-permeable peptide inhibitor of protein kinase C (IC50 ~ 0.5 μM). Consists of amino acids 19 - 31 of PKC pseudosubstrate domain linked by a disulphide bridge to a cell permeabilisation Antennapedia domain vector peptide. The Antennapedia peptide is actively taken up by intact cells, at 4 or 37°C, ensuring rapid and effective uptake of the inhibitor peptide. Once inside the cell, the disulphide bonds are subjected to reduction in the cytoplasm leading to release of the inhibitor peptide.