1 item tagged with 'macrophages'.
Nicotinamide: a vitamin able to shift macrophage differentiation toward macrophages with restricted inflammatory features.
The differentiation of human monocytes into macrophages is influenced by environmental signals. Here we asked in how far nicotinamide (NAM), a vitamin B3 derivative known to play a major role in … nicotinamide adenine dinucleotide (NAD)-mediated signaling events, is able to modulate monocyte differentiation into macrophages developed in the presence of granulocyte macrophage colony-stimulating factor (GM-MO) or macrophage colony-stimulating factor (M-MO). We found that GM-MO undergo biochemical, morphological and functional modifications in response to NAM, whereas M-MO were hardly affected. GM-MO exposed to NAM acquired an M-MO-like structure while the LPS-induced production of pro-inflammatory cytokines and COX-derived eicosanoids were down-regulated. In contrast, NAM had no effect on the production of IL-10 or the cytochrome P450-derived eicosanoids. Administration of NAM enhanced intracellular NAD concentrations; however, it did not prevent the LPS-mediated drain on NAD pools. In search of intracellular molecular targets of NAM known to be involved in LPS-induced cytokine and eicosanoid synthesis, we found NF-kappaB activity to be diminished. In conclusion, our data show that vitamin B3, when present during the differentiation of monocytes into GM-MO, interferes with biochemical pathways resulting in strongly reduced pro-inflammatory features.
Authors: R. Weiss, E. Schilling, A. Grahnert, V. Kolling, J. Dorow, U. Ceglarek, U. Sack, S. Hauschildt
Date Published: 20th Sep 2015
Publication Type: Not specified
PubMed ID: 26385774
Citation: Innate Immun. 2015 Nov;21(8):813-26. doi: 10.1177/1753425915602545. Epub 2015 Sep 18.
Created: 9th May 2019 at 14:44, Last updated: 7th Dec 2021 at 17:58