Plasma total homocysteine concentrations in adults with growth hormone (GH) deficiency: effects of GH replacement.

Abstract:

:Growth hormone (GH) deficiency is associated with increased cardiovascular morbidity and mortality. GH treatment improves the profile of many cardiovascular risk markers in individuals with GH deficiency (GHD). The aim of the present was to assess whether GH replacement may decrease plasma total homocysteine, an independent cardiovascular risk factor, thus potentially contributing to benefits of GH replacement in adult subjects with GHD. Twenty-five patients (17 female, 8 male), mean age 39-years, with GHD were studied. GH status had been determined by an insulin tolerance test and/or arginine stimulation test. After an overnight fast, plasma insulin, IGF-1, total homocysteine (Hcy), free thyroxine (FT4), creatinine, vitamin B12, and folate were measured at baseline (V1), 3 months (V2) and then at 6 months (V3) on GH treatment. The data were analysed by hierarchical statistical models, univariate and multivariate correlation. GH treatment resulted in an increase in IGF-1 (p<0.001, p<0.001), and insulin (p=0.068, p<0.001), at each visit, respectively. Hcy levels increased from V1 to V2 (7.7+/-0.53 to 9.15+/-0.45 micromol/L; p=0.051), but this was followed by a decline at V3 (to 8.8+/-0.59), so that the overall change of Hcy levels from V1 to V3, once individuals had achieved 'adequate' GH replacement, was no longer significantly different (p=0.090). When separated by gender, at 6 months (V3) there was a small, but significant increase in Hcy in men (p=0.028), but not in women (p=0.58). There was no significant change in B12, folate, free T4 or creatinine levels. Univariate analysis revealed that only B12 and folate showed significant negative relationships with Hcy (B12: parameter= -0.013, p<0.001; folate: parameter=-1.31, p<0.001), but not between Hcy and IGF-1 (p=0.18). In a multiple variable model, both B12 and folate remained significantly negatively associated with plasma total homocysteine (p=0.018; p<0.001, respectively). In this observational study normalisation of IGF-1 levels in adult subjects with growth hormone deficiency was not associated with a fall in total homocysteine. Before firm conclusions can be drawn about the contribution of changes in plasma homocysteine concentrations to cardiovascular prognosis in adult GHD patients receiving GH replacement, further controlled studies are required.

journal_name

Mol Genet Metab

authors

Lewandowski KC,Murray RD,Drzewoski J,O'Callaghan CJ,Czupryniak L,Hillhouse EW,Shalet SM,Randeva HS

doi

10.1016/j.ymgme.2003.08.020

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

330-7

issue

3

eissn

1096-7192

issn

1096-7206

pii

S1096719203001860

journal_volume

80

pub_type

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