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Related Experiment Videos

IGFs and IGFBPs in GH insensitivity.

M O Savage1, J C Blair, A J Jorge

  • 1Department of Endocrinology, St Bartholomew's Hospital, London, UK.

Endocrine Development
|May 10, 2005
PubMed
Summary
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Growth hormone (GH) insensitivity impacts IGF-I, IGFBP-3, and ALS levels, with severity varying across conditions like Laron syndrome and idiopathic short stature. Measuring these peptides aids in diagnosing GH insensitivity and assessing its biological impact.

Area of Science:

  • Endocrinology
  • Pediatric Endocrinology
  • Genetics

Background:

  • Growth hormone (GH) insensitivity syndromes (GHIS) disrupt the production of GH-dependent peptides, including Insulin-like Growth Factor-I (IGF-I), IGF Binding Protein-3 (IGFBP-3), and Acid-Labile Subunit (ALS).
  • These disruptions lead to varying degrees of peptide deficiency, impacting growth and development.

Purpose of the Study:

  • To explore the relative deficiencies of IGF-I, IGFBP-3, and ALS across the spectrum of GH insensitivity.
  • To differentiate between classical and non-classical GHIS and assess the impact of pubertal status on these peptide levels.
  • To evaluate the role of these peptides in diagnosing GH insensitivity and assessing disease severity.

Main Methods:

  • Analysis of serum levels of IGF-I, IGFBP-3, and ALS in patients with classical GHIS (Laron syndrome), partial GHIS, and idiopathic short stature (ISS).

Related Experiment Videos

  • Utilized IGF-I generation tests to assess peptide production capacity.
  • Correlational analysis between height standard deviation score (SDS) and IGFBP-3 SDS.
  • Comparison of peptide levels between classical and non-classical GHIS cases, and between pubertal and pre-pubertal subjects.

    • Main Results:

    • Classical GHIS exhibits severe reductions in IGF-I, IGFBP-3, and ALS, with impaired production during IGF-I generation tests.
    • Partial GHIS shows less severe deficiencies, with a positive correlation between height SDS and IGFBP-3 SDS.
    • Significant differences in IGFBP-3 and ALS levels were observed between classical and non-classical GHIS.
    • IGF-I, IGFBP-3, and ALS levels were higher in pubertal compared to pre-pubertal subjects.
    • ISS patients showed lower IGF-I levels, but generally normal IGF-I and IGFBP-3 responses to IGF-I generation tests.
    • Acquired GH insensitivity (e.g., Crohn's disease) typically presents with IGF-I deficiency but normal IGFBP-3.

    Conclusions:

    • Assessment of IGF-I, IGFBP-3, and ALS is crucial for diagnosing GH insensitivity states.
    • IGF-I is more sensitive to disturbances in GH action than IGFBP-3.
    • In severe GHIS, IGFBP-3 measurement is valuable for gauging the severity of the biological defect.