Basal, pulsatile, entropic (patterned), and spiky (staccato-like) properties of ACTH secretion: Impact of age, gender, and body mass index

Johannes D. Veldhuis, Ferdinand Roelfsema, Ali Iranmanesh, Bernard J. Carroll, Daniel M. Keenan, Steven M. Pincus

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Background: Age, gender, and BMI determine ultradian modes of LH and GH secretion, viz., pulsatile, basal, pattern-defined regularity [approximate entropy (ApEn)] and spikiness (sharp, brief excursions). Whether the same determinants apply to ACTH secretion is not known. Setting: The study was conducted at a tertiary medical center. Subjects: We studied normal women (n = 22) and men (n = 26) [ages, 23-77 yr; body mass index (BMI), 21-32 kg/m2]. Methods: Volunteers underwent 10-min blood sampling to create 24-h ACTH concentration profiles. Outcomes: Dynamic measures of ACTH secretion were studied. Results: Mean ACTH concentrations (R2=0.15; P=0.006) and both pulsatile (R2=0.12; P=0.018) and basal (nonpulsatile) (R 2 = 0.16; P = 0.005) ACTH secretion correlated directly with BMI (n = 48). Men had greater basal (P = 0.047), pulsatile (P = 0.031), and total (P = 0.010) 24-h ACTH secretion than women, including when total secretion was normalized for BMI(P=0.019). In men, both ACTH-cortisol feedforward and cortisol-ACTH feedback asynchrony (cross-ApEn) increased with age (R2 = 0.20 and 0.22; P=0.021 and 0.018). ACTH spikiness rose with age (P=0.046), principally in women. Irregularity of cortisol secretion (ApEn) increased with age (n = 48; P = 0.010), especially in men. In both sexes, percentage pulsatile ACTH secretion predicted 24-hmean cortisol concentrations (R2=0.14;P= 0.009). Conclusion: Valid comparisons of ultradian ACTH dynamics will require cohorts matched for age, gender, and BMI, conditions hitherto not satisfied in most physiological studies of this axis.

Original languageEnglish (US)
Pages (from-to)4045-4052
Number of pages8
JournalJournal of Clinical Endocrinology and Metabolism
Volume94
Issue number10
DOIs
StatePublished - Jan 1 2009

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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