Zobrazení zdroje stránky Lutzfitzsimmons3325

Compelling evidence suggests that heavy metals have potentially harmful effects on the skin. However, knowledge about cellular signaling events and toxicity subsequent to human skin cell exposure to metals is still poorly documented. The aim of this study was to focus on the interaction between four different heavy metals (lead, nickel, cadmium, and mercury) at doses mimicking chronic low-levels of environmental exposure and the effect on skin to get better insight into metal-cell interactions. We provide evidence that the two metals (lead and nickel) can permeate the skin and accumulate at high concentrations in the dermis. The skin barrier was disrupted after metal exposure and this was accompanied by apoptosis, DNA damage and lipid oxidation. Skin antioxidant enzymes such as glutathione peroxidase and methionine sulfoxide reductase are also heavy metal targets. Taken together, our findings provide insight into potential mechanisms of metal-induced oxidative stress production and the cellular consequences of these events.Tuning the metal support interaction (MSI) in heterogeneous catalysts is of utmost importance for various applications in different catalysis reactions. Pt-TiN systems are strong contenders for commercial catalysts, although the charge screening of Pt and non-involvement of N reduces their effective MSI and limits it to the Pt-Ti interface. Here, the bias driven landing of gas phase synthesized Pt nanoparticles (NPs) is used to change the nature of the MSI and enhance the charge transfer phenomenon. Bias driven landing of the Pt NPs translates their impact energies to the TiN surface, resulting in a weakening of the Ti-N bonds. This facilitates a new interaction between the Pt and N atoms, resulting in an electronic equilibration in the N-Pt-Ti triumvirate, nullifying the charge screening of Pt. This change in the nature of the MSI enables long range charge transfer throughout the catalyst surface and an increase in the electrocatalytic hydrogen evolution reaction (HER) activity of the Pt-TiN system.Biofunctionalization of artificial nerve implants by incorporation of specific bioactive factors has greatly enhanced the success of grafting procedures for peripheral nerve regeneration. However, most studies on novel biofunctionalized implants have emphasized the promotion of neuronal and axonal repair over vascularization, a process critical for long-term functional restoration. We constructed a dual-biofunctionalized chitosan/collagen composite scaffold with Ile-Lys-Val-Ala-Val (IKVAV) and vascular endothelial growth factor (VEGF) by combining solution blending, in situ lyophilization, and surface biomodification. Immobilization of VEGF and IKVAV on the scaffolds was confirmed both qualitatively by staining and quantitatively by ELISA. Various single- and dual-biofunctionalized scaffolds were compared for the promotion of endothelial cell (EC) and Schwann cell (SC) proliferation as well as the induction of angiogenic and neuroregeneration-associated genes by these cells in culture. The efficacy of these scaffolds for vascularization was evaluated by implantation in chicken embryos, while functional repair capacity in vivo was assessed in rats subjected to a 10 mm sciatic nerve injury. Dual-biofunctionalized scaffolds supported robust EC and SC proliferation and upregulated the expression levels of multiple genes and proteins related to neuroregeneration and vascularization. Dual-biofunctionalized scaffolds demonstrated superior vascularization induction in embryos and greater promotion of vascularization, myelination, and functional recovery in rats. These findings support the clinical potential of VEGF/IKVAV dual-biofunctionalized chitosan/collagen composite scaffolds for facilitating peripheral nerve regeneration, making it an attractive candidate for repairing critical nerve defect. The study may provide a critical experimental and theoretical basis for the development and design of new artificial nerve implants with excellent biological performance.<br /><br /> Children with inflammatory bowel diseases (IBDs) require primary and gastrointestinal (GI) care, but little is known about patient and family preferences for care receipt. We aimed to understand caregiver perceptions of current healthcare quality, describe barriers to receiving healthcare, and elicit caregiver and adolescent preferences for how comprehensive care ideally would be delivered.<br /><br /> This was an anonymous survey of caregivers of 2- to 17-year olds with IBD and adolescents with IBD aged 13-17 years at a large, free-standing children's hospital. [https://www.selleckchem.com/products/torin-1.html selleckchem] Surveys assessed patient medical history, family demographics, perceptions of health care quality and delivery, barriers to primary and GI care, and preferences for optimal care delivery.<br /><br /> Two hundred and seventeen caregivers and 140 adolescents were recruited, 214 caregivers and 133 adolescents consented/assented, and 160 caregivers and 84 adolescents completed the survey (75% and 60% response rate, respectively). Mean patient age was 14 years (SD = 3); 51% male; 79% Crohn's disease, 16% ulcerative colitis, and 4% indeterminate colitis. Caregivers were primarily female (86%), Caucasian (94%), and living in a 2-caregiver household (79%). Most caregivers reported that their child's primary care physician (PCP) and GI doctor oversaw their primary care (71%) and their IBD care (94%), respectively. Caregivers were satisfied with communication with their PCP and GI providers (&gt;90%) but did not know how well they communicated with one another (54%). Barriers to primary and GI care varied, and few caregivers (6%) reported unmet healthcare needs. Caregivers and adolescents saw PCPs and GI doctors having important roles in comprehensive care, though specific preferences for care delivery differed.<br /><br /> Caregivers and adolescent perspectives are essential to developing family-centered care models for children with IBD.<br /><br />Caregivers and adolescent perspectives are essential to developing family-centered care models for children with IBD.Necrosis resulting from mechanical local factors can be seen in patients with granulomatosis with polyangiitis (GPA) even in remission. GPA can cause serious morbidity even when limited. An ocular prosthesis that increases inflammation and damages local circulation should be used very carefully in such patients. In this article, we report a 68-year-old male patient who was diagnosed with localized GPA 11 years ago and referred to our clinic with the complaint of displacement of an ocular prosthesis inside the nose and epistaxis. Four years ago, the left eye was enucleated because of pain and vision loss. Two months after the enucleation, the patient began to use an ocular prosthesis. Orbital medial wall destruction developed while the patient was receiving maintenance therapy that consisted of cyclophosphamide (150 mg/day) plus prednisolone (32 mg). When the ocular prosthesis was displaced in the nasal cavity, the prosthesis was first removed and the patient was clinically stabilized. Later, orbital wall reconstruction was performed at another center.