Tomohiro Tanaka, Yo-ichi Nabeshima  Cell Metabolism 

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Nampt/PBEF/Visfatin: A New Player in β Cell Physiology and in Metabolic Diseases?  Tomohiro Tanaka, Yo-ichi Nabeshima  Cell Metabolism  Volume 6, Issue 5, Pages 341-343 (November 2007) DOI: 10.1016/j.cmet.2007.10.004 Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 1 Control of Insulin Secretion by Nampt/PBEF/Visfatin Nampt/PBEF/visfatin secreted from adipose tissue converts nicotinamide to NMN, possibly in the plasma. NMN, which crosses the plasma membrane by an unidentified mechanism, is converted intracellularly to NAD by Nmnat. The β cell NAD pool, supplied by the Nampt/PBEF/visfatin system, plays an essential role in glucose-stimulated insulin secretion. The NAD-dependent deacetylase SIRT1 may be a candidate molecule linking NAD level and insulin secretion. Insulin released from the β cells acts on muscle, liver, and adipose tissue in turn. Nampt, nicotinamide phosphoribosyltransferase; PBEF, pre-B cell colony-enhancing factor; NMN, nicotinamide mononucleotide; NAD, nicotinamide adenine dinucleotide; Nmnat, nicotinamide/nicotinic acid mononucleotide adenylyltransferase; SIRT1, sirtuin 1. Cell Metabolism 2007 6, 341-343DOI: (10.1016/j.cmet.2007.10.004) Copyright © 2007 Elsevier Inc. Terms and Conditions