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Spontaneous growth hormone and somatomedin-C/insulin-like growth factor-l secretion in obese subjects during puberty

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Abstract

It has been reported that adult obese subjects present a reduced growth hormone secretion. As no data are available in the pubertal period, which is characterized in lean subjects by an increased spontaneous growth hormone secretion, the growth hormone circadian concentration was studied in a group of 18 obese male subjects in different pubertal stages, and compared to 26 age-matched control subjects. The data observed evidenced no statistically relevant differences regarding LH and FSH circadian secretion and morning testosterone concentration. On the contrary a statistically significant (p < 0.02) difference in growth hormone 24 h integrated concentration was evident, particularly in prepubertal subjects; the sleep-related peak was evident in 28% of obese subjects and in 85% of controls. Sm-C/IGF-I concentration was similar to the concentration observed in controls in the prepubertal stage, but did not show the expected increase in the late puberty. Auxological data, performed on a sample of 80 subjects, showed both advanced height and bone age at beginning of puberty, and a trend toward a reduction of percentile for height in parallel with the pubertal maturation, suggesting that pubertal growth spurt in obese subjects is at least less pronounced than in lean subjects. It is concluded that GH and Sm-C/IGF-I secretion is impaired during puberty in obese subjects, leading to a reduced growth rate, while in the prepubertal period factors other than GH may replace or even potentiate its action.

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Authors and Affiliations

  1. Cattedra di Fisiopatologia Endocrina, ISMI, Viale Benedetto XV 6, 16132, Genova, Italia

    F. Minuto

  2. Cattedra di Endocrinologia, ISMI, University of Genova, Italy

    A. Barreca, P. Del Monte, P. Fortini & G. Giordano

  3. Centro Auxologico Italiano di Piancavallo, Milano, Italy

    M. Resentini & F. Morabito

Authors
  1. F. Minuto
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  2. A. Barreca
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  3. P. Del Monte
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  4. P. Fortini
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  5. M. Resentini
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  6. F. Morabito
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  7. G. Giordano
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Supported in part by research grants from Ministero della Pubblica Istruzione and Consiglio Nazionale delle Ricerche n. 84.00818.04 and n. 85.000781.04.

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Minuto, F., Barreca, A., Del Monte, P. et al. Spontaneous growth hormone and somatomedin-C/insulin-like growth factor-l secretion in obese subjects during puberty. J Endocrinol Invest 11, 489–495 (1988). https://doi.org/10.1007/BF03350166

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  • DOI: https://doi.org/10.1007/BF03350166

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