- Short-term regulation of NHE3 by EGF and protein kinase C but not protein kinase A involves vesicle trafficking in epithelial cells and fibroblasts. Donowitz, M., Janecki, A., Akhter, S., Cavet, M.E., Sanchez, F., Lamprecht, G., Zizak, M., Kwon, W.L., Khurana, S., Yun, C.H., Tse, C.M. Ann. N. Y. Acad. Sci. (2000)