Activation of mitogen-activated protein kinase (MAPK) by GnRH is cell-context dependent.
The interaction of GnRH with its cognate receptor (GnRHR) in pituitary gonadotropes includes activation of Gq/G11 and phospholipase Cbeta (PLCbeta), which generates the second messengers inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG), which are required for Ca2+ mobilization and PKC isoforms activation. Activation of PKC in pituitary gonadotropes leads to the activation of the major members of the mitogen-activated protein kinase superfamily (MAPK), namely: extracellular signal-regulated kinase (ERK), jun-N-terminal Kinase (JNK) and p38MAPK. The above pathways mediate GnRH-induced gonadotropin release and synthesis. Here we summarise the diverse mechanisms utilized by GnRH to activate the MAPK members and show that they depend on "cell-context".
Dobkin-Bekman
Masha
M
Department of Biochemistry, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel.
Naidich
Michal
M
Pawson
Adam J
AJ
Millar
Robert P
RP
Seger
Rony
R
Naor
Zvi
Z