title: Various oscillation patterns of serum fibroblast growth factor 21 concentrations in healthy volunteers.
abstract: BACKGROUND
  Fibroblast growth factor 21 (FGF21) was originally identified as a paroxysm proliferator activated receptor-α target gene product and is a hormone involved in metabolic regulation. The purpose of this study was to investigate the diurnal variation of serum FGF21 concentration in obese and non-obese healthy volunteers.
  
  
  METHODS
  Blood samples were collected from five non-obese (body mass index [BMI] ≤23 kg/m(2)) and five obese (BMI ≥25 kg/m(2)) healthy young men every 30 to 60 minutes over 24 hours. Serum FGF21 concentrations were determined by radioimmunoassay. Anthropometric parameters, glucose, free fatty acid, insulin, leptin, and cortisol concentrations were also measured.
  
  
  RESULTS
  The serum FGF21 concentrations displayed various individual oscillation patterns. The oscillation frequency ranged between 6 and 12 times per day. The average duration of oscillation was 2.52 hours (range, 1.9 to 3.0 hours). The peaks and troughs of FGF21 oscillation showed no circadian rhythm. However, the oscillation frequency had a diurnal variation and was lower during the light-off period than during the light-on period (2.4 vs. 7.3 times, P<0.001). There was no difference in the total frequency or duration of oscillations between non-obese and obese subjects, but obese individuals had increased numbers of larger oscillations (amplitude ≥0.19 ng/mL).
  
  
  CONCLUSIONS
  Various oscillation patterns in serum FGF21 concentration were observed, and reduced oscillation frequencies were seen during sleep. The oscillation patterns of serum FGF21 concentration suggest that FGF21 may be secreted into systemic circulation in a pulsatile manner. Obesity appeared to affect the amplitude of oscillations of serum FGF21.
authors.affiliation: Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Sang Ah
authors.initials: SA
authors.lastname: Lee
authors.forename: Eunheiu
authors.initials: E
authors.lastname: Jeong
authors.forename: Eun Hee
authors.initials: EH
authors.lastname: Kim
authors.forename: Mi-Seon
authors.initials: MS
authors.lastname: Shin
authors.forename: Jenie Yoonoo
authors.initials: JY
authors.lastname: Hwang
authors.forename: Eun Hee
authors.initials: EH
authors.lastname: Koh
authors.forename: Woo Je
authors.initials: WJ
authors.lastname: Lee
authors.forename: Joong-Yeol
authors.initials: JY
authors.lastname: Park
authors.forename: Min-Seon
authors.initials: MS
authors.lastname: Kim