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Maintained malnutrition produces a progressive decrease in (OPG)/RANKL ratio and leptin levels in patients with

M T Muñoz-Calvo1, V Barrios, M T García de Alvaro

  • 1Department of Endocrinology, Hospital Infantil Universitario Niño Jesús, Universidad Autónoma, Madrid, Spain.

Scandinavian Journal of Clinical and Laboratory Investigation
|June 15, 2007
PubMed
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In anorexia nervosa (AN), a lower osteoprotegerin (OPG)/receptor activator of nuclear factor-kappaB ligand (RANKL) ratio is linked to bone loss. This imbalance may contribute to decreased bone mineral density (BMD) in adolescent girls with AN.

Area of Science:

  • Endocrinology
  • Bone Metabolism
  • Adolescent Health

Background:

  • Osteoprotegerin (OPG) and receptor activator of nuclear factor-kappaB ligand (RANKL) are critical regulators of bone remodeling.
  • Anorexia nervosa (AN) is associated with significant bone metabolism disturbances, including osteopenia.
  • Leptin levels also play a role in bone health and are often altered in AN.

Purpose of the Study:

  • To investigate basal serum levels of OPG, RANKL, and leptin in adolescent girls with AN.
  • To assess bone mineral density (BMD) using DEXA at the lumbar spine (L1-L4).
  • To evaluate the evolution of these parameters over one year in two distinct groups of AN patients.

Main Methods:

  • Two groups of adolescent girls with AN and secondary amenorrhea were studied: Group I (AN >1 year, estrogen treatment) and Group II (AN <1 year, nutritional treatment).

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  • A control group of 19 healthy, age-matched girls with normal BMI and menstrual cycles was included for comparison.
  • Serum OPG, RANKL, leptin, and BMD were measured at baseline and after one year.

    • Main Results:

    • The OPG/RANKL ratio significantly decreased after one year in Group I, driven by increased RANKL levels.
    • A strong correlation (r=0.95, p<0.001) between the OPG/RANKL ratio and BMD was observed in Group I at baseline.
    • Group I patients exhibited lower BMD values compared to Group II patients, who maintained normal BMD.

    Conclusions:

    • A decreased OPG/RANKL ratio in adolescent girls with AN may partially explain the observed increase in bone loss.
    • Estrogen treatment in AN patients with longer disease duration did not prevent the decrease in the OPG/RANKL ratio.
    • These findings highlight the complex interplay between hormonal status, nutritional intake, and bone metabolism in AN.