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Division of Endocrinology, Diabetes, and Clinical Nutrition (J.Q.P.), Oregon Health & Science University, Portland, Oregon 97201; and University of Washington (D.S.W., P.B., D.E.C.), Veterans Affairs Puget Sound Health Care System and Harborview Medical Center, Seattle, Washington 98108
Address all correspondence and requests for reprints to: Jonathan Q. Purnell, M.D., Oregon Health & Science University, Division of Endocrinology, Diabetes, and Clinical Nutrition, L607, 3181 SW Sam Jackson Park Road, Portland, Oregon 97201. E-mail: purnellj{at}ohsu.edu.
The gut peptide, ghrelin, may participate in the control of energy homeostasis and pituitary hormone secretion in humans, stimulating both food intake and, at pharmacological doses, ACTH and cortisol secretion. Meal consumption and weight loss regulate ghrelin levels, but less is known about the relationship of ghrelin to body composition, aging, menopausal status, and lipid metabolism. Therefore, 60 adult men and women of widely varying ages and weights were characterized in terms of body composition and levels of ghrelin, glucose, insulin, lipids, and cortisol. Fasting ghrelin levels correlated positively with age and negatively with BMI and fat cell size, but were not related to fat mass, intraabdominal fat, or lean mass. Fasting ghrelin levels correlated most strongly with insulin levels (r = -0.39; P = 0.002), insulin resistance as determined by the quantitative insulin sensitivity check index (r = 0.38; P = 0.003), and high-density lipoprotein cholesterol levels (r = 0.33; P = 0.009). Meal-induced ghrelin suppression correlated with the postprandial rise in insulin (r = 0.39; P < 0.05). Ghrelin levels were similar in men and women and did not vary by menopausal status or in association with cortisol levels. Our data are consistent with the hypotheses that insulin may negatively regulate ghrelin and that high-density lipoprotein may be a carrier particle for circulating ghrelin.
This work was supported by National Institutes of Health (NIH) Grant K23 DK02689 (to J.Q.P.), NIH General Clinical Research Center Grants MO1RR00037 and M01RR00334, NIH Grants RO1 DK55460 and K24 DK02860 (to D.S.W.), a Burroughs Wellcome Fund Career Award and Andrew W. Mellon Foundation Grant 80-1519 (to D.E.C.), R01 DK 61516 (to D.E.C.), NIH P3ODK17047 (Diabetes Endocrine Research Center grant), and by the Medical Research Service of the Department of Veterans Affairs.
Abbreviations: AUC, Area under the curve; BMI, body mass index; HDL, high-density lipoprotein; HL, hepatic lipase; IAF, intra-abdominal fat; LDL, low-density lipoprotein; LPL, lipoprotein lipase; QUICKI, quantitative insulin sensitivity check index; SQF, sc fat.
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