Glucocorticoids induce rapid up-regulation of mitogen-activated protein kinase phosphatase-1 and dephosphorylation of extracellular signal-regulated kinase and impair proliferation in human and mouse osteoblast cell lines. - Engelbrecht, Y; De Wet, H; Horsch, K; Langeveldt, C; Hough, F; Hulley, P (Endocrinology, 2003)