[The rhythmicity of adiponectin and its relation with glucocorticoids, insulin and leptin].
OBJECTIVE
To investigate the circadian rhythmicity of adiponectin in patients with Cushing's syndrome and obesity, as well as in normal subjects. The effects of glucocorticoids, insulin and leptin on the secretion of adiponectin were also explored.


METHODS
15 patients with Cushing's syndrome and 10 with obesity as well as 9 normal subjects were recruited and their serum adiponectin, glucocorticoids, insulin and leptin levels were determined 6 times a day (8:00, 12:00, 16:00, 20:00, 24:00, 3:00).


RESULTS
Circadian rhythmicity of adiponectin was not observed, but the adiponectin levels in patients with obesity were lower than those in the normal subjects at all 6 time spots. The area under curve (AUC) of serum adiponectin concentrations were significantly negatively correlated with body mass index (BMI, r = 0.46, P < 0.01), waist circumference (r = -0.33, P < 0.05) and insulin AUC (r = -0.36, P < 0.05). A multiple linear regression analysis revealed that BMI and waist circumference were two significant independent parameters of the plasma adiponectin level. The adiponectin levels did not manifest any change after short term dexamethasone administration with both high and low doses, but were obviously decreased after surgery.


CONCLUSIONS
Neither long-term endogenous hyperglucocorticoidism nor short-term dexamethasone administration affects the serum adiponectin levels and the serum adiponectin concentrations remain unchanged even with elevated postprandial insulin levels.
Yang
Ying
Y
Shanghai Institute of Endocrinology, Ruijin Hospital, Shanghai Second Medical University, Shanghai 200025, China.
Tang
Jin-feng
JF
Wang
Qi-di
QD
Li
Feng-ying
FY
Zhang
Yi-bo
YB
Zhou
Li-bin
LB
Chen
Ming-dao
MD
D052242:Adiponectin; D000293:Adolescent; D000328:Adult; D019540:Area Under Curve; D015992:Body Mass Index; D002940:Circadian Rhythm; D003480:Cushing Syndrome / Q000097:blood*; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D007328:Insulin / Q000097:blood*; D036341:Intercellular Signaling Peptides and Proteins / Q000097:blood*; D020738:Leptin / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000097:blood
D052242:Adiponectin; D007328:Insulin; D036341:Intercellular Signaling Peptides and Proteins; D020738:Leptin; D006854:Hydrocortisone