Total, free and bound leptin and thyroid function in elderly women with different body weights

Massimiliano Ruscica, Elena Dozio, Sara Gandini, Pierluigi Gnocchi, Guya Giuseppina Devalle, Marcella Motta, Elio Roti, Paolo Magni

Research output: Contribution to journalArticlepeer-review


Objective: The present study was aimed at evaluating the relationship of total leptin, and its free leptin (FL) and bound leptin (BL) fractions with adipose mass in very old euthyroid women, in relationship to thyroid function. Subjects and methods: Twenty-five older women (age: 73-95 years) were studied. Subjects representing underweight, normal weight and overweight/obese conditions were included. Plasma leptin, TSH, free T4 (FT4) and free T3, (FT3) total and HDL cholesterol were measured. FL and BL were evaluated by Fast Protein Liquid Chromatography (FPLC) analysis. Results: Plasma leptin concentration was positively correlated with body mass index (BMI) (r = 0.64, P = 0.0005) and tricipital skin-fold thickness (TF) (r = 0.46, P = 0.0187). Leptin was positively correlated with TSH (r = 0.50, P = 0.0116) and inversely with FT3 (r = -0.40, P = 0.0477). TSH correlated with the adiposity indexes BMI (r = 0.40, P = 0.05) and TF (r = 0.42, P = 0.0336). Plasma FT3 was positively correlated with FT 4 (r = 0.49, P = 0.012). FL and BL were evaluated in 8 out of 25 subjects. FL positively correlated with BMI (r = 0.81, P = 0.0218) and leptin (r = 0.83, P = 0.0004), whereas BL did not correlate with these parameters. Conclusions: The present results indicate that in very old women, plasma leptin concentrations reflect the extent of adipose mass and suggest that a complex regulatory interaction exists between leptin and thyroid function, possibly taking place at central (hypothalamus-pituitary) and peripheral (deiodinase activity) levels.

Original languageEnglish
Pages (from-to)1002-1008
Number of pages7
JournalClinical Endocrinology
Issue number6
Publication statusPublished - Jun 2008

ASJC Scopus subject areas

  • Endocrinology


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