Division of Endocrinology and Metabolism, Department of Medicine, School of Medicine, Federal University of Sergipe, Aracaju, Brazil.
J Endocrinol Invest. 2012 Mar;35(3):265-8. doi: 10.3275/7608. Epub 2011 Mar 21.
Conflicting data exist on the effects of GH replacement therapy (GHRT) on thyroid function and thyroid volume (TV) in GH-deficient (GHD) patients.
The aim of this study was to assess the effects of GHRT on thyroid function and TV in adults with congenital lifetime isolated GHD (IGHD).
We studied 20 GH-naïve adults with IGHD due to a homozygous mutation of the GHRH-receptor gene at baseline, after 6-month depot- GH replacement therapy (pGH), and 6-month washout (6mo). Total T(3), free T(4) (FT(4)), reverse T(3) (rT(3)), TSH, IGF-I, SHBG, and TV were measured; body surface area-corrected TV (CTV) was calculated.
IGF-I and T(3) increased pGH. T(3) levels remained elevated at 6mo. GHRT did not significantly change FT(4), rT(3), TSH, and SHBG. TV and CTV increased pGH and remained elevated at 6mo.
GHRT in IGHD adults caused an increase in serum T(3) levels and TV, suggesting an important role of the GH-IGF-I axis in thyroid function.
关于生长激素替代治疗(GHRT)对生长激素缺乏症(GHD)患者甲状腺功能和甲状腺体积(TV)的影响,存在相互矛盾的数据。
本研究旨在评估 GHRT 对先天性终生孤立性 GHD(IGHD)成人甲状腺功能和 TV 的影响。
我们在基线时研究了 20 名由于 GHRH 受体基因突变而导致 GH 缺乏的 GH 初治成年人,在 6 个月的长效 GH 替代治疗(pGH)后和 6 个月洗脱期(6mo)后进行了研究。测量了总 T(3)、游离 T(4)(FT(4))、反 T(3)(rT(3))、TSH、IGF-I、SHBG 和 TV;计算了体表面积校正的 TV(CTV)。
IGHD 成人的 IGF-I 和 T(3)在 pGH 时增加。T(3)水平在 6mo 时仍保持升高。GHRT 对 FT(4)、rT(3)、TSH 和 SHBG 没有显著影响。TV 和 CTV 在 pGH 时增加,并在 6mo 时保持升高。
GHRT 在 IGHD 成人中引起血清 T(3)水平和 TV 的增加,表明 GH-IGF-I 轴在甲状腺功能中起着重要作用。