... CREB,CRE-binding protein; EIA, enzyme immunoassay; ERK, extracellular signal-regulated kinase; MEK, mitogen-activated proteinkinase ⁄ extracellular signal-regulated kinase kinase; pAb, polyclonal antibody; ... increasesthe intracellular calcium level and activates variouskinases including MEK [16,18–20]. MEK, also knownas MAPK kinase [34], is an activator of ERK, a MAPK. The MEK ⁄ ERK pathway is a ... hormone and prostaglan-din F2 alpha-stimulated mitogen-activated proteinkinase activation in cultured transgenic murine osteo-blasts. Mol Endocrinol 17, 1607–1621.39 Tokuda H, Harada A, Hirade...