[show abstract][hide abstract] ABSTRACT: Recent data demonstrated that the -174 G > C IL-6 polymorphism may account for differences in the therapeutic response to laparoscopic adjustable gastric banding (LAGB) surgery.
We investigated the impact of -174 G > C IL-6 polymorphism on weight loss, body composition, and fluid distribution changes in obese subjects after LAGB.
Twenty obese subjects were selected and studied at baseline and 3 months after LAGB. Genetic assessment of -174 G > C IL-6 polymorphism and anthropometric and bioelectrical impedance analysis were performed.
At baseline, C(+) carriers had a lower extracellular water (ECW) and higher intra-CW, phase angle (PA), reactance X(c), and X(c)/height. LAGB surgery determined significant reductions in weight and BMI. After LAGB, in C(-) carriers, significant decreases in weight, BMI, and ECW and increases in BCM, BCMI, ICW, PA, and X(c)/H were highlighted. In C(+) carriers, significant reductions in weight, BMI, ICW, and PA and increases in ECW, Na/K, resistance (R), and R/height were obtained. Significant higher reductions in BMI and X(c)/H were observed in C(+) with respect to C(-) carriers.
Genotyping of genetic variants, for example, the -174 G > C polymorphism of IL-6, gives the opportunity to predict therapeutic response, in terms of body composition outcomes after LAGB.
[show abstract][hide abstract] ABSTRACT: Osteoporosis is a serious global health problem for the future, that is why improving diagnostic methods and prevention of this disease could be helpful.
To assess the effects of calcium supplementations combined with Vitamin D on bone mineral density (BMD) and bone mineral content (BMC) in a representative sample of peri- and post-menopausal women in a double-blind, a randomized, controlled trial was untaken.
A total of 120 women aged over 45 were included in a randomised placebo-controlled, double-blind trial on the effect of a daily dietary supplementation of calcium and Vitamin D on bone mineral density and bone mineral content; over a 30-month period.
Dietary intake assessment; dual-energy X-ray absorptiometry to measure total body and segmental bone mineral density and bone mineral content at beginning of the study and every 15 months were undertaken.
There was no significant change in dietary calcium or Vitamin D intakes in either of the treatment groups during the 30-month intervention period. The change in total BMD in the calcium group was significantly different from that in the placebo group (P <0.005). The placebo group lost a total BMD at a rate of about 0.4% per year. There was an inverse correlation between BMD and age.
The effect of calcium and Vitamin D supplementation on bone mineral density of calcium has been demonstrated in this group of young adult women. Our results showed the positive effect of calcium and Vitamin D supplementation in women both peri- and post-menopausal status; for this reason a supplementation of calcium and Vitamin D should be recommended as a strategic option in helping to prevent early postmenopausal bone loss.
Pharmacological Research 01/2005; 50(6):637-41. · 4.35 Impact Factor
[show abstract][hide abstract] ABSTRACT: The Zeta class of glutathione transferases (GSTs) has only recently been discovered and hence has been poorly characterized. Here we investigate the substrate binding and kinetic mechanisms of the human Zeta class GSTZ1c-1c by means of pre-steady state and steady-state experiments and site-directed mutagenesis. Binding of GSH occurs at a very low rate compared with that observed for the more recently evolved GSTs (Alpha, Mu, and Pi classes). Moreover, the single step binding mechanism observed in this enzyme is reminiscent of that found for the Theta class enzyme, whereas the Alpha, Mu, and Pi classes have adopted a multistep binding mechanism. Replacement of Cys16 with Ala increases the rate of GSH release from the active site causing a 10-fold decrease of affinity toward GSH. Cys16 also plays a crucial role in co-substrate binding; the mutant enzyme is unable to bind the carcinogenic substrate dichloroacetic acid in the absence of GSH. However, both substrate binding and GSH activation are not rate-limiting in catalysis. A peculiarity of the hGSTZ1c-1c is the half-site activation of bound GSH. This suggests a primitive monomer-monomer interaction that, in the recently diverged GSTP1-1, gives rise to a sophisticated cooperative mechanism that preserves the catalytic efficiency of this GST under stress conditions.
Journal of Biological Chemistry 09/2004; 279(32):33336-42. · 4.65 Impact Factor