The impact of GH deficiency and rhGH replacement therapy on IGF-I, IGFBP-3 and ALS levels has been widely studied. There is less information available on IGF-II levels, the component of the ternary complex poorly dependent on GH. We investigate the components of IGFs system in 36 GHD adults (28M, 8F, age 45 ± 14 yrs) before and after 12 months of rhGH therapy (mean dose 0.3 ± 0.1 mg/day). One-hundred healthy sex- and age-matched subjects were studied for comparison. At baseline, GHD patients showed IGF-I and IGF-II levels and IGFs to IGFBP-3 molar ratios that were lower than controls. During therapy, IGF-I levels increased (p < 0.01) to normal range. IGF-II levels, though higher than at baseline (p < 0.01), remained lower than in controls (p < 0.01). ALS and IGFBP-3 significantly increased (p < 0.001). These modifications resulted in normalization in IGF-I to IGFBP-3 ratio, while no change in IGF-II to IGFBP-3 ratio was observed. In conclusion, the increase of serum IGF-II levels during rhGH treatment in GHD patients probably reflects the increase in the other components of ternary complex (ALS and IGFBP-3). However, serum IGF-II levels as well as IGF-II to IGFBP-3 ratio, although increased, were definitely lower than in controls. This last result, given the increasing evidences of a direct implication of IGF-II in cancer, may further confirm the safety of rhGH replacement in adults with severe GHD as diagnosed by appropriate stimulation tests.
Evaluation of the Components of the Insulin-like Growth Factors System in GH-deficient Adults: Effects of Twelve-month rhGH Treatment / E. Ferrante, C. Giavoli, S. Porretti, E. Vassallo, C.L. Ronchi, A.G. Lania, P. Beck-Peccoz, A. Spada. - In: HORMONE AND METABOLIC RESEARCH. - ISSN 0018-5043. - 38:5(2006), pp. 352-355.
Evaluation of the Components of the Insulin-like Growth Factors System in GH-deficient Adults: Effects of Twelve-month rhGH Treatment
E. FerrantePrimo
;C. GiavoliSecondo
;E. Vassallo;C.L. Ronchi;A.G. Lania;P. Beck-PeccozPenultimo
;A. SpadaUltimo
2006
Abstract
The impact of GH deficiency and rhGH replacement therapy on IGF-I, IGFBP-3 and ALS levels has been widely studied. There is less information available on IGF-II levels, the component of the ternary complex poorly dependent on GH. We investigate the components of IGFs system in 36 GHD adults (28M, 8F, age 45 ± 14 yrs) before and after 12 months of rhGH therapy (mean dose 0.3 ± 0.1 mg/day). One-hundred healthy sex- and age-matched subjects were studied for comparison. At baseline, GHD patients showed IGF-I and IGF-II levels and IGFs to IGFBP-3 molar ratios that were lower than controls. During therapy, IGF-I levels increased (p < 0.01) to normal range. IGF-II levels, though higher than at baseline (p < 0.01), remained lower than in controls (p < 0.01). ALS and IGFBP-3 significantly increased (p < 0.001). These modifications resulted in normalization in IGF-I to IGFBP-3 ratio, while no change in IGF-II to IGFBP-3 ratio was observed. In conclusion, the increase of serum IGF-II levels during rhGH treatment in GHD patients probably reflects the increase in the other components of ternary complex (ALS and IGFBP-3). However, serum IGF-II levels as well as IGF-II to IGFBP-3 ratio, although increased, were definitely lower than in controls. This last result, given the increasing evidences of a direct implication of IGF-II in cancer, may further confirm the safety of rhGH replacement in adults with severe GHD as diagnosed by appropriate stimulation tests.Pubblicazioni consigliate
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