Premium
Growth hormone treatment in children with idiopathic short stature: correlation of growth response with peripheral thyroid hormone action
Author(s) -
Susperreguy Sebastián,
Muñoz Liliana,
Tkalenko Natalia Y.,
Mascanfroni Ivan D.,
Alamino Vanina A.,
Montesinos María M.,
MasiniRepiso Ana M.,
Miras Mirta B.,
Pellizas Claudia G.
Publication year - 2011
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/j.1365-2265.2010.03924.x
Subject(s) - endocrinology , medicine , short stature , growth hormone , peripheral , hormone , thyroid , idiopathic short stature
Objective Idiopathic short stature (ISS) describes short children with normal GH secretion. Although GH treatment increases their heights, growth response to the therapy differs among patients. Thyroid hormones (TH) are essential for longitudinal growth acting mainly through TH receptors (TR) α and β. We have previously reported that GH treatment reduced peripheral TH action in Turner Syndrome by TR down‐regulation. The aims of the study were to assess the effect of GH treatment to ISS on peripheral TH action and the correlation between thyroid status and growth response to the therapy. Subjects, design and measurements Eighteen normal (control) and twenty‐five ISS children were enrolled and evaluated before and after 12 months of life time (control) or 12 months of GH therapy (ISS). Fasting blood was used for serum biochemical evaluations, peripheral blood mononuclear cells for TR mRNA determination by QRT‐PCR and growth parameters by standard methods. Results GH treatment modified neither TR mRNA levels nor serum markers of TH action in ISS evaluated as a whole group. However, the individual change in TRβ mRNA levels correlated to the change in sex hormone–binding globulin (SHBG) levels after GH therapy. The growth response to GH correlated positively with the change in TRα mRNA level and negatively with that in TRβ mRNA, TSH and SHBG levels. The change in each TR mRNA isoform after GH treatment correlated negatively with its own basal level. Conclusions GH therapy induced individual changes in TR expression in ISS that correlated with their growth response. The basal TR mRNA level could predetermine the change in TR expression and therefore the sensitivity to GH treatment.