An alternative approach for the currently used replacement therapy in dentistry is to apply materials that restore tooth tissue. Among them, composites, based on biopolymers with calcium phosphates, and cells can be applied. In the present work, a composite based on polyvinylpyrrolidone (PVP) and alginate (Alg) with carbonate hydroxyapatite (CHA) was prepared and characterized. The composite was investigated by X-ray diffraction, infrared spectroscopy, electron paramagnetic resonance (EPR) and scanning electron microscopy methods, and the microstructure, porosity, and swelling properties of the material were described. In vitro studies included the MTT test using mouse fibroblasts, and adhesion and survivability tests with human dental pulp stem cells (DPSC). The mineral component of the composite corresponded to CHA with an admixture of amorphous calcium phosphate. The presence of a bond between the polymer matrix and CHA particles was shown by EPR. The structure of the material was represented by micro- (30–190 μm) and nano-pores (average 8.71 ± 4.15 nm). The swelling measurements attested that CHA addition increased the polymer matrix hydrophilicity by 200%. In vitro studies demonstrated the biocompatibility of PVP-Alg-CHA (95 ± 5% cell viability), and DPSC located inside the pores. It was concluded that the PVP-Alg-CHA porous composite is promising for dentistry applications.
В лекции подробно рассматриваются современные представления об эпидемиологии, патогенезе, клинических проявлениях болезни/синдрома Бехчета, а также принципы диагностики, оценки активности и тяжести заболевания, подходы к терапии. Ключевые слова: болезнь/синдром Бехчета; клинические проявления; диагностика; терапия.
Six models of experimental immunogenic uveitis induced by injection of normal horse serum were tried in rabbits. A convenient working variant of the model was developed characterized by high activity and long duration of the inflammatory process in the eye. Creation of this model requires pre-sensitization (subcutaneous injection of 5 ml normal horse serum) followed by intravitreal injection of the resolving dose of horse serum on day 9. An adapted improved model of experimental immunogenic uveitis in rabbits is proposed.
Objective: to estimate changes of uveitis activity using BOS24 (Behсet's disease Ocular attack Score 24) during antiinflammatory and immunosuppressive therapy in patients with Behcet's disease (BD).Subjects and methods. 103 (75.6%) of the 138 patients with BD fulfilled the 1990 International Study Group for Behсet's Disease (ISGBD) criteria had eye lesions; 55 (53.4%) of the 103 patients had an exacerbation of uveitis. 55 patients with an exacerbation of uveitis were found to have active inflammation in 94 eyes. The activity of uveitis was monitored during anti-inflammatory and immunosuppressive therapy, by using BOS24 that consists of 6 parameters with maximal possible value 24.Results and discussion. The mean BOS24 for 94 eyes with active uveitis at baseline was 9.33±0.91. The most pronounced inflammatory changes were found in the posterior chamber of the eye, mainly in the area of the peripheral retina, rarely in the area of the fovea and in the optic disc. All the patients with an exacerbation of uveitis received systemic therapy with glucocorticoids, cyclosporine and/or azathioprine. After 8.92±3.47 months of treatment, the mean BOS2 decreased significantly (p < 0.001) to 2.20±1.02. The most substantial positive changes were noted in the anterior chamber of the eye (p = 0.03), vitreous humor (p < 0.01), and peripheral retina (p < 0.001).Conclusion. BOS24 is a reliable tool to quantify uveitis activity in patients with BD and its dynamics during antiinflammatory and immunosuppressive therapy.
A composite material based on electrospinning printed polyhydroxybutyrate fibers impregnated with brushite cement containing Zn substitution was developed for bone implant applications. Powder X-ray Diffraction (PXRD), Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy were applied for materials characterization. Soaking the composite in Ringer’s solution led to the transformation of brushite into apatite phase, accompanied by the morphology changes of the material. The bending strength of the composite material was measured to be 3.1 ± 0.5 MPa. NCTC mouse fibroblast cells were used to demonstrate by means of the MTT test that the developed material was not cytotoxic. The behavior of the human dental pulp stem cells on the surface of the composite material investigated by the direct contact method was similar to the control. It was found that the developed Zn containing composite material possessed antibacterial properties, as testified by microbiology investigations against bacteria strains of Escherichia coli and Staphylococcus aureus. Thus, the developed composite material is promising for the treatment of damaged tissues with bacterial infection complications.
Behcet’s disease (BD) is a systemic autoinflammatory-autoimmune disease (chronic systemic vasculitis) of unknown etiology, almost 70% of patients develop uveitis. BD pathogenesis is complex, human herpesviruses (HHV) play an important role among infectious trigger factors. Ability of herpesviruses to modulate cytokine production and evade host’s immune response is known.Aim of the study was to assess the effect of Herpes simplex virus type 1, Herpes simplex virus type 2, Cytomegalovirus, Epstein-Barr virus on systemic levels of chemokines, pro- and anti-inflammatory cytokines in BD with and without uveitis. Serum samples were collected from 116 BD patients chronically infected with HHV and examined in ELISA-test for markers of HHV reactivation (IgG-antibodies to immediate early HSV antigens 1, 2 and CMV, early EBV antigen). Concentration of IL-1β, IFNγ, MCP-1, IL-2, IL-4, IL-5, IL-6, IL-8, IL-12p70, IL-13, IL-18, TNFα, GMCSF, Eotaxin, GRO-α, IP-10, MIP-1α, MIP-1β, SDF-1α, RANTES detected in multiplex analysis. TGF-β1, TGF-β2 were measured in ELISA-test. Depending on presence and activity of uveitis 3 groups of patients with BD were identified: group 1 – active uveitis, group 2 – remission of uveitis, group 3 – BD without ocular manifestations. After serological study 2 subgroups were highlighted in each group: a) patients with antibody markers of reactivation of at least one HHV, b) patients chronically infected with HHV, without serological signs of reactivation. Mean level and detection rate of cytokines and chemokines in patients with active uveitis (1a, 1b) and in remission (2a, 2b) were compared with patients without eye damage (3a, 3b). Chronic HHV infection (subgroup “b”) was compared with reactivation (subgroup “a”). A significant increase of MCP-1/ CCL2, MIP-1α/CCL3, MIP-1β/CCL4, RANTES/CCL5, IP-10, SDF-1α chemokines in serum, as well as IFNγ, TGF-β1, and TGF-β2 was observed in patients with uveitis (regardless of their activity) and HHV reactivation compared to patients without uveitis. Our data indicate that systemic production of cytokines and chemokines in BD patients and uveitis could be affected by the activity of chronic herpesvirus infections, and the greatest changes are related to chemokines.
The aim – to evaluate the effectiveness of various immunosuppressive therapy schemes for current uveitis used in real clinical practice in patients with Behçet’s disease (BD).Material and methods. The study included 531 patients with a reliable (ICBD criteria 2014) diagnosis of BD, observed in the V.A. Nasonova Research Institute of Rheumatology from 2006 to 2020. The majority were men (331 (62.3%)). The average age (M±SD) was 32.9±10.0 years, the median duration of BD (Me (25%; 75%)) – 96 (48; 174) months. 60.4% patients had uveitis, 70.7% – exacerbation of uveitis (EU). Uveitis activity was assessed by the BOS24 index (Behçet’s disease Ocular attack Score 24) in 202 patients with EU. The total activity of BD was evaluated according to BDCAF index (Behçet’s Disease Current Activity Form). Glucocorticoids (GC) was systematically received by 68.7% patients with EU, including 51.5% in the form of pulse therapy. 88.9% patients with EU received cytotoxics: 33.5% – cyclosporine (CS), 20.7% – azathioprine (AZA), 11.4% – AZA+COL, 8.8% – AZA+CS, 7.5% – colchicine (COL), 3.9% – cyclophosphamide (CPh). 11.9% patients with EU were prescribe Biologics, mainly i-TNF-α (11,4%: 8,8% – adalimumab, 2.2% – infliximab, 0.4% – golimumab) and rituximab (0.4%). The effectiveness of therapy was evaluated on average after 18.0 (8.0; 36.0) months.Results. According to the dynamics of BDCAF, by the end of follow-up, BD activity significantly decreased in all groups, with the exception of patients who received COL. A more significant decrease in BDCAF was observed in the combination therapy groups: AZA+CS (ΔBDCAF=–4.08±3.60), AZA+COL (ΔBDCAF=–3.57±2.50), as well as in the CS group (ΔBDCAF=–3.57±3.39), but no statistically significant differences in ΔBDCAF between the groups were obtained, which does not allow us to speak about a significant advantage of a particular drug. There were no significant differences in ΔBDCAF between patients who received (ΔBDCAF=–3.41±3.89) and those who did not receive (ΔBDCAF=–3.59±3.23) Biologics. According to the dynamics of BOS24, the most effective for relieving symptoms of intraocular inflammation were CS (ΔBOS24=–7.0 (–12.0; –3.0)), AZA (ΔBOS24=–7.0 (–15.0; –2.0)), a combination of CS+AZA (ΔBOS24=–5.0 (–8.0; –2.0)) and CPh (ΔBOS24=–4.0 (–14.0; –2.0). The differences between BOS24 before and after treatment in these groups were statistically significant. When assigning AZA+COL (ΔBOS24=–1.0 (–4.0; 0)) or COL (ΔBOS24=–0.5 (–2.0; 0)) uveitis activity decreased during therapy, but not significantly. According to ΔBOS24, uveitis therapy by CS was statistically significantly more effective compared to AZA+COL and COL; and AZA treatment, compared to COL. Biologics, mainly adalimumab, significantly and rapidly reduce the severity of intraocular inflammation (ΔBOS24=–7.0 (–18.0; 0)) compared with GC and cytotoxics (ΔBOS24=–4,0 (–9,0; –1,0)), however statistically significant differences between the groups were not obtained due to the small number of Biologics groups.Conclusion. CS, AZA and their combination, as well as i-TNF-α (mainly adalimumab) are more effective for relieving uveitis symptoms in patients with BD. BOS24 is a reliable tool for quantifying the activity of uveitis in BD patients and its dynamics against the background of anti-inflammatory and immunosuppressive therapy.
In the previous part of the review clinical and diagnostic aspects of some non-infectious uveitis in patients with immunoinflammatory diseases were discussed. In this part we proceed the discussion of ocular manifestations of a number of other immunoinflammatory conditions. In addition to uveitis associated with spondyloarthropathies, rheumatoid arthritis, Still’s disease, juvenile idiopathic arthritis and systemic sarcoidosis described in the previous part, ocular manifestations are also common in systemic vasculitis, systemic lupus erythematosus, Vogt—Koyanagi—Harada syndrome. Despite the numerous diagnostic schemes and therapy algorithms developed to date, much in the pathogenesis of uveitis associated with immuno-inflammatory diseases remains unclear. The need to develop personalized and multidisciplinary approaches for the treatment and diagnosis of non-infectious uveitis in numerous systemic immunoinflammatory diseases remains relevant. In-depth understanding of etiopathogenetic mechanisms of immunoinflammatory processes will allow to develop new approaches in the treatment of patients with uveitis.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.