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Abstract Title:

Nicotinamide: a vitamin able to shift macrophage differentiation toward macrophages with restricted inflammatory features.

Abstract Source:

Innate Immun. 2015 Nov ;21(8):813-26. Epub 2015 Sep 18. PMID: 26385774

Abstract Author(s):

Ronald Weiss, Erik Schilling, Anja Grahnert, Valeen Kölling, Juliane Dorow, Uta Ceglarek, Ulrich Sack, Sunna Hauschildt

Article Affiliation:

Ronald Weiss

Abstract:

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-MØ) or macrophage colony-stimulating factor (M-MØ). We found that GM-MØ undergo biochemical, morphological and functional modifications in response to NAM, whereas M-MØ were hardly affected. GM-MØ exposed to NAM acquired an M-MØ-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-κB activity to be diminished. In conclusion, our data show that vitamin B3, when present during the differentiation of monocytes into GM-MØ, interferes with biochemical pathways resulting in strongly reduced pro-inflammatory features.

Study Type : In Vitro Study

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Sayer Ji
Founder of GreenMedInfo.com

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