no change in the placebo group . Lo et al. showed, in an 18-month placebo-controlled study in which 52 HIV-infected relatively GH-deficient patients received Temozolomide ic50 a mean dose of 0.33 mg rhGH/day, that trunk mass and VAT decreased by −0.5 kg and −22 cm2 in the GH group vs. 0.2 kg and −4 cm2 in the placebo group, corresponding to a treatment
effect of a reduction of approximately 5% in trunk fat and 8% in VAT. Notably, rhGH therapy in this setting was accompanied by minor deterioration of glucose tolerance . In the present study, a slightly higher dose of rhGH compared with the regimen used by Lo et al. produced a more pronounced effect on abdominal fat distribution, without a concomitant change in 2-h post-challenge glucose level. Whether or not these results were attributable to counteracting of the glucose metabolic deterioration frequently caused by rhGH therapy, facilitated by a more beneficial effect on fat distribution, as demonstrated in the present study, remains elusive and requires further research. Recently, in a large 26-week placebo-controlled Adriamycin in vitro study of 404 HIV-infected patients with an accumulation of abdominal fat,
who received a synthetic GH-releasing factor analogue (Tesamorelin), Falutz et al. reported that trunk fat mass and VAT decreased by −1.0 kg and −28 cm2 in the Tesamorelin group vs. 0.4 kg and 5 cm2 in the placebo group, respectively, corresponding to a net treatment effect of an 11% reduction
in trunk fat and a 20% reduction in VAT, which is comparable to the results of the present study. Tesamorelin did not seem to affect glucose metabolism but 23% of the patients discontinued the study, 9% because of adverse events . Patients in the GH group in the present study showed significantly greater increases in lean mass and maximal oxygen uptake compared with patients in the placebo group. This finding is consistent with data from previous studies of pharmacological Thalidomide rhGH dose regimens in HIV-infected patients, in which subjects showed increases in muscle power, endurance and maximum work output [22–24]. A possible mechanism for the more pronounced effect in the present study, compared with studies in which a comparable dose was used, could relate to the timing of the dose. In healthy individuals, as in HIV-infected patients without fat redistribution, the mean concentration of GH from 12 am to 8 pm is low, compared with the remaining 16 h of the day [25,26]. We found the same to be true of HIV-infected patients with HALS (SB Haugaard, unpublished data). By administering rhGH at the time when endogenous GH secretion is likely to be low, we may have increased the diurnal mean level of GH. In this study, the effect of rhGH on HIV-infected patients regardless of the presence of HALS was investigated. This offered the opportunity to evaluate not only a possible effect of rhGH in patients with HALS vs.