Inhibition of COX activity by NSAIDs or ascorbate increases cAMP levels and enhances differentiation in 1alpha,25-dihydroxyvitamin D3-induced HL-60 cells. - López-Lluch G; Fernández-Ayala DJ; Alcaín FJ; Burón MI; Quesada JM; Navas P (Archives of biochemistry and biophysics, 2005)