- Potentiation of protein kinase C zeta activity by 15-deoxy-delta(12,14)-prostaglandin J(2) induces an imbalance between mitogen-activated protein kinases and NF-kappa B that promotes apoptosis in macrophages. Castrillo, A., Través, P.G., Martín-Sanz, P., Parkinson, S., Parker, P.J., Boscá, L. Mol. Cell. Biol. (2003)