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A line of defense systems protects arterial and valvular tissue calcifications. Given the major roles of phosphate in soft tissue calcification, phosphate mimetics and/or prevention of phosphate dissipation represent novel potential therapeutic approaches for arterial and valvular calcification.
To describe the associations of blood pressure and arterial stiffness with knee cartilage volume in patients with knee osteoarthritis (OA).
A secondary analysis was performed on the data from participants of a randomized controlled trial, which identified the effects of vitamin D supplementation on knee structures and symptoms among patients with symptomatic knee OA. Brachial and central blood pressure, arterial stiffness indicators and knee cartilage volume were measured at baseline and 2-year follow-up. Associations were assessed using generalized estimating equations.
Among 231 participants (average age 63.2 years), 48.9% were females. Higher supine systolic and diastolic pressures were significantly associated with lower tibial cartilage volume (Systolic Lateral β -6.23, medial β -5.14, total β -11.35 mm3/mmHg. Diastolic Lateral β -10.25, medial β -11.29, total β -21.50 mm3/mmHg). Higher supine systolic pressure was associated with lower femoral cartilage volume (Lateral β -17.35, total β -28.31 mm3/mmHg). Central systolic pressure and arterial stiffness indicators (including pulse wave velocity, central pulse pressure, and peripheral pulse pressure) were largely not associated with knee cartilage volume; however, higher augmentation index was associated with lower tibial and femoral cartilage volume (Tibial Medial β -8.24, total β -19.13 mm3/percent. Femoral Lateral β -23.70, medial β -26.42, total β -50.12 mm3/percent).
Blood pressure and arterial stiffness are associated with knee cartilage volume at several sites among knee OA patients. This supports that blood pressure and arterial stiffness may involve in the progression of knee OA.
Blood pressure and arterial stiffness are associated with knee cartilage volume at several sites among knee OA patients. This supports that blood pressure and arterial stiffness may involve in the progression of knee OA.
To evaluate the efficacy and safety of JAK inhibitors (JAKi) in juvenile dermatomyositis (JDM).
We conducted a single-center retrospective study of patients with JDM treated by JAKi with a follow-up of at least 6 months. Proportion of clinically inactive disease (CID) within six months of JAKi initiation was evaluated using PRINTO criteria and skin Disease Activity Score. Serum IFN-α concentration was measured by SIMOA assay.
Nine refractory and one new-onset patients with JDM treated with ruxolitinib (n = 7) or baricitinib (n = 3) were included. The main indications for treatment were refractory muscle involvement (n = 8) and ulcerative skin disease (n = 2). CID was achieved in 5/10 patients (2/2 anti-MDA5, 3/4 anti-NXP2, 0/3 anti-TIF1γ positive patients) within six months of JAKi introduction. All responders could withdraw plasmatic exchange, immunoadsorption and other immunosuppressive drugs. The mean daily steroid dose decreased from 1.1 mg/Kg (range 0.35-2 mg/Kg/d) to 0.1 (range, 0-0.3, p= 0.008) in patients achieving CID, and was stopped in two. Serum IFN-α concentrations were elevated in all patients at the time of treatment initiation and normalized in both responder and non-responder. A muscle biopsy repeated in one patient 26 months after the initiation of JAKi, showed a complete restoration of muscle endomysial microvascular bed. Herpes zoster and skin abscesses developed in three and two patients, respectively.
JAKis resulted in a CID in a subset of new-onset or refractory patients with JDM and may dramatically reverse severe muscle vasculopathy. Overall tolerance was good except for a high rate of herpes zoster infection.
JAKis resulted in a CID in a subset of new-onset or refractory patients with JDM and may dramatically reverse severe muscle vasculopathy. Overall tolerance was good except for a high rate of herpes zoster infection.
To assess the risk of flare and damage accrual after low dose glucocorticoids (GC) discontinuation in systemic lupus erythematosus (SLE).
We performed a comprehensive literature search of PubMed, EMBASE, Cochrane library and Scopus databases from inception to July 2020 for studies concerning relapses/damage accrual in SLE patients. Pooled incidence rates of flare and time to flare with their 95% confidence intervals (CI) after GC withdrawal were calculated. Summary risk ratio (RR) and 95% CI of flare/organ damage accrual risk were computed using a random or fixed effects model.
738 SLE patients with GC discontinuation in 17 publications were eligible for the final analysis. In the primary meta-analysis, the pooled incidence of flare was 24% (95% CI 21-27%) and 13% (95% CI 8-18%) for global and major flare respectively. Pooled time to flare was 21.08 (95% CI 9.32-32.85) months. In the secondary meta-analysis, GC discontinuation showed an increased risk of flare comparing with GC continuation [RR (95% CI) =1.38 (1.01-1.89)], but the risk of major flares was not increased (RR = 1.77, 95% CI 0.40-7.83). Moreover, GC withdrawal was associated with a borderline reduction of risk in SDI increase in comparison with GC continuation (RR = 0.64, 95% CI 0.38 - 1.09).
GC discontinuation leads to a slightly increased risk of flare, however no increase in major flare and a borderline reduction of risk in further damage in SLE patients. Baseline screening for candidate patients and long-term follow up after GC withdrawal are needed to reliably evaluate the organ damage increase.
GC discontinuation leads to a slightly increased risk of flare, however no increase in major flare and a borderline reduction of risk in further damage in SLE patients. Baseline screening for candidate patients and long-term follow up after GC withdrawal are needed to reliably evaluate the organ damage increase.
Von Willebrand factor (VWF) is a plasma glycoprotein involved in primary hemostasis, while also having additional roles beyond hemostasis namely in cancer, inflammation, angiogenesis and potentially in vascular smooth muscle cell (VSMC) proliferation. Here, we addressed how VWF modulates VSMC proliferation and investigated the underlying molecular pathways and the in vivo pathophysiological relevance.
VWF induced proliferation of human aortic VSMCs and also promoted VSMC migration. Treatment of cells with a siRNA against αv integrin or the RGT-peptide blocking αvβ3 signaling abolished proliferation. However, VWF did not bind to αvβ3 on VSMCs through its RGD-motif. Rather, we identified the VWF A2 domain as the region mediating binding to the cells. We hypothesized the involvement of a member of the LDL-related receptor protein (LRP) family due to their known ability to act as co-receptors. Using the universal LRP-inhibitor receptor-associated protein, we confirmed LRP-mediated VSMC proliferation. siRNA exvon Willebrand factor (VWF) accumulates in the vascular wall of atherosclerotic lesions and localizes to areas of vascular smooth muscle cell (VSMC) proliferation. VWF was found to use its A2-domain for binding to the VSMC-receptor LRP4, which in turn triggered outside-in signaling via integrin αVβ3, thereby inducing VSMC proliferation. Interfering with A2-domain/LRP4 interactions might offer innovative and additional therapeutical approaches to limit pathological hyperplasia.Hypoxia is a critical pathological element in many human diseases, including ischemic stroke, myocardial infarction, and solid tumors. Of particular significance and interest of ours are the cellular and molecular mechanisms that underlie susceptibility or tolerance to low O2. Previous studies have demonstrated that Notch signaling pathway regulates hypoxia tolerance in both Drosophila melanogaster and humans. However, the mechanisms mediating Notch-conferred hypoxia tolerance are largely unknown. In this study, we delineate the evolutionarily conserved mechanisms underlying this hypoxia tolerant phenotype. We determined the role of a group of conserved genes that were obtained from a comparative genomic analysis of hypoxia-tolerant D.melanogaster populations and human highlanders living at the high-altitude regions of the world (Tibetans, Ethiopians, and Andeans). We developed a novel dual-UAS/Gal4 system that allows us to activate Notch signaling in the Eaat1-positive glial cells, which remarkably enhances hypoxia tolerance in D.melanogaster, and, simultaneously, knock down a candidate gene in the same set of glial cells. Using this system, we discovered that the interactions between Notch signaling and bnl (fibroblast growth factor), croc (forkhead transcription factor C), or Mkk4 (mitogen-activated protein kinase kinase 4) are important for hypoxia tolerance, at least in part, through regulating neuronal development and survival under hypoxic conditions. Akt inhibitor Becausethese genetic mechanisms are evolutionarily conserved, this group of genes may serve as novel targets for developing therapeutic strategies and have a strong potential to be translated to humans to treat/prevent hypoxia-related diseases.We examined whether perception of color saturation and lightness depends on the three-dimensional (3D) shape and surface gloss of surfaces rendered to have different hues. In Experiment 1, we parametrically varied specular roughness of predominantly planar surfaces with different mesoscopic relief heights. The orientation of surfaces was varied relative to the light source and observer. Observers matched perceived lightness and chroma (effectively saturation) using spherical objects rendered using CIE LCH color space. We observed strong interactions between perceived saturation and lightness with changes in surface orientation and surface properties (specular roughness and 3D relief height). Declines in saturation and increases in lightness were observed with increasing specular roughness. Changes in relief height had greater effects on perceived saturation and lightness for blue hues compared with reddish and greenish hues. Experiment 2 found inverse correlations between perceived gloss and specular roughness across conditions. Experiment 3 estimated perceived specular coverage and found that a weighted combination of perceived gloss and specular coverage could account for perceived color saturation and lightness, with different coefficients accounting for the perceptual experience for each of the three hue conditions. These findings suggest that perceived color saturation and lightness depend on the separation of specular highlights from diffuse shading informative of chromatic surface reflectance.
Mineral and bone disorders (MBD) are associated with higher mortality in dialysis patients. The main guidelines related to the subject, Kidney Disease Outcomes Quality Initiative (KDOQI) and Kidney Disease Improving Global Outcomes (KDIGO), were elaborated based on published information from hemodialysis participants. The aim of our study was to evaluate the impact of calcium (Ca), phosphorus (P), and parathyroid hormone (PTH) (according to guideline ranges from KDOQI and KDIGO) on the cardiovascular mortality of peritoneal dialysis (PD) patients.
We used the BRAZPDII database, an observational multi-centric prospective study, which assessed participants on PD between December 2004 and January 2011. Amongst 9,905 participants included in this database, we analyzed 4424 participants who were on PD for at least 6 months. The appropriate confounding variables were entered into the model. Serum levels of Ca, P, and PTH were the variables of interest for the purposes of the current study.
We found a significant association between high P serum levels, categorized by KDOQI and KDIGO (P above 5.
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