Inhibition of antigen-presenting cell function by alendronate in vitro

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
P SansoniE G Engleman

Abstract

Bisphosphonates are potent inhibitors of bone resorption in vivo and are emerging as important and widely used drugs for the treatment of a variety of abnormal bone resorptive processes. In the current study we investigated the in vitro effects of 4-amino-1-hydroxybutylidene-1,1-bisphosphonate (alendronate), a recently developed, extremely potent bisphosphonate, on the immune functions of human peripheral blood mononuclear cells (PBMCs). PBMC proliferation induced by lectins, alloantigens, and a nominal antigen (tetanus toxoid) was inhibited in a dose-dependent manner by alendronate. Pretreatment of monocytes, but not T cells, with the compound at concentrations ranging from 10(-4) to 10(-8) M was inhibitory, indicating that alendronate acts selectively on antigen-presenting cells (APCs). Alendronate did not affect the viability of monocytes or T cells or the expression of cell surface molecules known to play critical roles in antigen presentation. Alendronate exhibited dose-dependent inhibition of the production of interleukin-1 beta (IL-1 beta), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-alpha) by activated monocytes. The inhibitory effect of 10(-6) M alendronate on PBMC proliferation was reversed by 10 U/ml r...Continue Reading

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