title: Differential regulation of TNF-alpha and IL-1beta production from endotoxin stimulated human monocytes by phosphodiesterase inhibitors.
abstract: The effect of selective PDE-I (vinpocetine), PDE-III (milrinone, CI-930), PDE-IV (rolipram, nitroquazone), and PDE-V (zaprinast) isozyme inhibitors on TNF-alpha and IL-1beta production from LPS stimulated human monocytes was investigated. The PDE-IV inhibitors caused a concentration dependent inhibition of TNF-alpha production, but only partially inhibited IL-1beta at high concentrations. High concentrations of the PDE-III inhibitors weakly inhibited TNF-alpha, but had no effect on IL-1beta production. PDE-V inhibition was associated with an augmentation of cytokine secretion. Studies with combinations of PDE isozyme inhibitors indicated that PDE-III and PDE-V inhibitors modulate rolipram's suppression of TNF production in an additive manner. These data confirm that TNF-alpha and IL-1beta production from LPS stimulated human monocytes are differentially regulated, and suggest that PDE-IV inhibitors have the potential to suppress TNF levels in man.
authors.affiliation: Inflammation/Bone Metabolism Division Wyeth-Ayerst Research CN 8000 Princeton NJ 08543-8000 USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Molnar-Kimber
authors.forename: L
authors.initials: L
authors.lastname: Yonno
authors.forename: R J
authors.initials: RJ
authors.lastname: Heaslip
authors.forename: B M
authors.initials: BM
authors.lastname: Weichman