Résumé
<p><b>OBJECTIVE</b>To study the influence of canthaxanthin on D-galactose induced osseous changes of rat.</p><p><b>METHODS</b>Forty-five six-week-old Wistar male rats were randomly divided into model group, canthaxanthin group and young control group. In addition, 15 sixteen-month-old Wistar male rats were used as old control group. Model group and canthaxanthin group were given injections of D-galactose for 5 months (20 mg/kg/once per-day) to cause aging of rat. Then routine osseous parameters were tested and compared among the 4 groups.</p><p><b>RESULTS</b>Compared with young control group, the BMD, parameters of structural mechanics and biomechanics, bone calcium, manganese, magnesium and the content of hydroxyproline in the model group decreased significantly (P < 0.01), however, the content of bone phosphorus, the activity of bone and serum ALP increased significantly (P < 0.01). Those changes of the model group were the same as the old control group,but the changes in the canthaxanthin group significantly differed with the model group (P < 0.01).</p><p><b>CONCLUSION</b>The high does of D-galactose intake can cause aging and osteoporosis at the same time in rat, but canthaxanthin can prevent and inhibit D-galactose induced osseous changes.</p>
Sujets)
Animaux , Mâle , Rats , Phosphatase alcaline , Sang , Phénomènes biomécaniques , Densité osseuse , Os et tissu osseux , Chimie , Calcium , Canthaxanthine , Pharmacologie , Galactose , Toxicité , Malonaldéhyde , Sang , Rat Wistar , Superoxide dismutase , SangRésumé
<p><b>OBJECTIVE</b>To investigate the effect of Astaxanthin on enhancing the function of anti-oxidative damage in osteoblast.</p><p><b>METHODS</b>MC3T3-E1 osteoblasts were randomly divided into five groups, including control group, model group, Astaxanthin group [low-dose (1 x 10(-7) mol/L), middle-dose (1 x 10(-6) mol/L), high-dose (1 x 10(-5) mol/L)], in which the activity of cells, activity of superoxide dismutase (SOD), the content of reactive oxygen species (ROS), lipid oxygen (LPO) and membrane fluidity were tested and compared.</p><p><b>RESULTS</b>Compared with Astaxanthin groups, the activity of cells, SOD activity and membrane fluidity in the model group were significantly decreased (P < 0.01). However, the contents of ROS and LPO were significantly raised (P < 0.01).</p><p><b>CONCLUSION</b>H2O2 can cause oxidative damage of MC3T3-E1 osteoblasts, but Astaxanthin can prevent or decrease its influence.</p>