Total Antioxidant Capacity and Nuclear DNA Damage in Keratinocytes after Exposure to H2 O2

Studies of oxidative stress have classically been performed by analyzing specific, single antioxidants. In this study, susceptibility to oxidative stress in the human keratinocyte cell line NCTC2544 exposed to hydrogen peroxide (H2O2) was measured by the TOSC (total oxyradical scavenging capacity) assay, which discriminates between the antioxidant capacity toward peroxyl radicals and hydroxyl radical. The generation of H2O2-induced DNA damage, total antioxidant capacity and levels of antioxidant enzymes (catalase, superoxide dismutase, glutathione reductase, glutathione S-transferase, glutathione peroxidase) were studied. Exposure to H2O2-induced DNA damage that was gradually restored while a significant reduction in cellular TOSC values was obtained independently of stressor concentrations and the degree of DNA repair. Whereas TOSC values and cell resistance to H2O2 showed a good relationship, the extent of DNA damage is independent from cellular total antioxidant capacity. Indeed, maximum DNA damage and cell mortality were observed in the first 4 h, whereas TOSC remained persistently low until 48 h. Catalase levels were significantly lower in exposed cells after 24 and 48 h. Keratinocytes exposed after 48 h to a second H2O2 treatment exhibited massive cell death. A possible linkage was observed between TOSC values and NCTC2544 resistance to H2O2 challenge. The TOSC assay appears to be a useful tool for evaluating cellular resistance to oxidative stres

Biomimetic Mg- and Mg,CO3- substituted Hydroxyapatites: Synthesis, Characterization and in Vitro Behaviour

The doping of the apatite with carbonate or/and Mg ions in biologically-like amounts (6 and 1 wt.%, respectively) was performed. Chemicophysical characterizations and cell culture tests were carried out onto the synthetic Mg- and Mg,CO3-substituted (∼30–40 nm particle size) powders in comparison with stoichiometric HA (∼160 nm particle size) to determine as mesenchymal stem cells (MSCs) can directly use the mineral microenvironment to stimulate their own proliferation and differentiation activities. At the same time the growth of human osteoblast like cells (MG-63) was evaluated to determine the compatibility of the synthetic doped apatites for bone substitution. Cell morphology analysis by SEM as well as MTT and ALP tests were performed. The peculiar chemico-physical properties of the doped (Mg- and Mg,CO3-substituted) materials improved the behaviours of MSC and MG-63 cells in term of adhesion, proliferation and metabolic activation compared to stoichiometric HA

Expression of motility-related molecule Cdc42 in endometrial tissue in women with adenomyosis and ovarian endometriomata

To evaluate Cdc42 expression in eutopic and ectopic endometrial tissue in patients with adenomyosis and ovarian endometriotic cysts compared with patients without endometriosis