- Serotonin stimulates phospholipase A2 and the release of arachidonic acid in hippocampal neurons by a type 2 serotonin receptor that is independent of inositolphospholipid hydrolysis. Felder, C.C., Kanterman, R.Y., Ma, A.L., Axelrod, J. Proc. Natl. Acad. Sci. U.S.A. (1990)