CONTEXT: Animal studies indicate that nicotinamide phosphoribosyltransferase [Nampt/visfatin/pre-B-cell colony-enhancing factor (PBEF)] contributes to the circadian fine-tuning of metabolic turnover. However, it is unknown whether circulating Nampt concentrations, which are elevated in type 2 diabetes and obesity, display a diurnal rhythm in humans. OBJECTIVE: Our objective was to examine the 24-h profile of serum Nampt in humans under conditions of sleep and sleep deprivation and relate the Nampt pattern to morning postprandial glucose metabolism. INTERVENTION: Fourteen healthy men participated in two 24-h sessions starting at 1800 h, including either regular 8-h-night sleep or continuous wakefulness. Serum Nampt and leptin were measured in 1.5- to 3-h intervals. In the morning, plasma glucose and serum insulin responses to standardized breakfast intake were determined. MAIN OUTCOME MEASURES: Under regular sleep-wake conditions, Nampt levels displayed a pronounced diurnal rhythm, peaking during early afternoon (P < 0.001) that was inverse to leptin profiles peaking in the early night. When subjects stayed awake, the Nampt rhythm was preserved but phase advanced by about 2 h (P < 0.05). Two-hour postprandial plasma glucose concentrations were elevated after sleep loss (P < 0.05), whereas serum insulin was not affected. The relative glucose increase due to sleep loss displayed a positive association with the magnitude of the Nampt phase shift (r = 0.54; P < 0.05). CONCLUSIONS: Serum Nampt concentrations follow a diurnal rhythm, peaking in the afternoon. Sleep loss induces a Nampt rhythm phase shift that is positively related to the impairment of postprandial glucose metabolism due to sleep deprivation, suggesting a regulatory impact of Nampt rhythmicity on glucose homeostasis.
RCT Entities:
CONTEXT: Animal studies indicate that nicotinamide phosphoribosyltransferase [Nampt/visfatin/pre-B-cell colony-enhancing factor (PBEF)] contributes to the circadian fine-tuning of metabolic turnover. However, it is unknown whether circulating Nampt concentrations, which are elevated in type 2 diabetes and obesity, display a diurnal rhythm in humans. OBJECTIVE: Our objective was to examine the 24-h profile of serum Nampt in humans under conditions of sleep and sleep deprivation and relate the Nampt pattern to morning postprandial glucose metabolism. INTERVENTION: Fourteen healthy men participated in two 24-h sessions starting at 1800 h, including either regular 8-h-night sleep or continuous wakefulness. Serum Nampt and leptin were measured in 1.5- to 3-h intervals. In the morning, plasma glucose and serum insulin responses to standardized breakfast intake were determined. MAIN OUTCOME MEASURES: Under regular sleep-wake conditions, Nampt levels displayed a pronounced diurnal rhythm, peaking during early afternoon (P < 0.001) that was inverse to leptin profiles peaking in the early night. When subjects stayed awake, the Nampt rhythm was preserved but phase advanced by about 2 h (P < 0.05). Two-hour postprandial plasma glucose concentrations were elevated after sleep loss (P < 0.05), whereas serum insulin was not affected. The relative glucose increase due to sleep loss displayed a positive association with the magnitude of the Nampt phase shift (r = 0.54; P < 0.05). CONCLUSIONS: Serum Nampt concentrations follow a diurnal rhythm, peaking in the afternoon. Sleep loss induces a Nampt rhythm phase shift that is positively related to the impairment of postprandial glucose metabolism due to sleep deprivation, suggesting a regulatory impact of Nampt rhythmicity on glucose homeostasis.
Authors: O Pivovarova; Ö Gögebakan; S Sucher; J Groth; V Murahovschi; K Kessler; M Osterhoff; N Rudovich; A Kramer; A F H Pfeiffer Journal: Int J Obes (Lond) Date: 2016-02-23 Impact factor: 5.095
Authors: Miguel A Gutierrez-Monreal; Jan-Frieder Harmsen; Patrick Schrauwen; Karyn A Esser Journal: Obesity (Silver Spring) Date: 2020-05-28 Impact factor: 5.002
Authors: Sylvette Bas; Axel Finckh; Gabor J Puskas; Domizio Suva; Pierre Hoffmeyer; Cem Gabay; Anne Lübbeke Journal: Int Orthop Date: 2014-07-09 Impact factor: 3.075