uPAR Research Articles

Activation of the Urokinase Plasminogen Activator/Urokinase Plasminogen Activator Receptor System in Periodontitis: A Case-Control Study.

The plasminogen activating (PA) system has a multitude of functions such as wound healing, proteolytic activity, collagen degradation and cell growth, and the role of the urokinase plasminogen activator/urokinase plasminogen activator receptor (uPA/uPAR) system has been studied in many disease states. The aim of this study was to investigate salivary concentrations of uPA, uPAR and uPA activity in patients with periodontitis to identify biomarkers and novel pathogenic relationships. Saliva samples were obtained from 169 participants, comprising patients with periodontitis (n = 103) and periodontally healthy volunteers (n = 66) and analysed for uPA and uPAR with a multiplex protein assay using proximity extension analysis in a subset of samples, followed by validation with ELISA. The protease activity of salivary uPA was quantified using a fluorometric assay. Patients with periodontitis had a 4.0-fold higher (p < 0.001) salivary uPA and a 2.5-fold higher (p < 0.001) salivary uPAR concentration in comparison to periodontally healthy participants. The salivary uPA activity (median [IQR]) from patients with periodontitis (123.21 [188.29] U/mL) was 1.6-fold higher (p < 0.01) than the salivary uPA activity from periodontally healthy participants (76.83 [98.09] U/mL). Levels of uPA and uPAR were strongly correlated with periodontal indices, whereas only weak correlations were found with BMI and age. Activation of uPA/uPAR likely plays a role in the pathogenesis of periodontal diseases. uPA/uPAR may have potential utility as candidate salivary biomarkers in periodontal pathogenesis.

Abstract 4136930: Plasminogen Activator Urokinase Receptor (PLAUR) Levels are a Predictor of Adverse Cardiovascular Outcomes in the General Population, Independent of High-Sensitive CRP (hs-CRP)

Background: The gene Plasminogen Activator Urokinase Receptor (PLAUR) encodes the urokinase plasminogen activator surface receptor (uPAR), which upon cleavage releases Soluble Urokinase Plasminogen Activator Receptor (suPAR). SuPAR has emerged as a novel biomarker of inflammation and immunity and is associated with adverse cardiovascular events, particularly coronary artery disease (CAD), regardless of hs-CRP levels, a well-established inflammatory biomarker. However, whether the PLAUR gene predicts adverse cardiovascular events remains uncertain. Methods: We investigated the relationship between PLAUR levels, measured via Olink Immunoassay, in 40,790 individuals from the UK Biobank, and the occurrence of adverse cardiovascular events such as myocardial infarction (MI), as well as all-cause and cardiovascular mortality. Our analysis involved the use of Cox and Fine and Gray proportional hazards models, adjusting for age, sex, race, HDL, LDL, triglyceride levels, BMI, prevalence of hypertension (HTN), prevalence of type 2 diabetes (T2D), smoking history, and use of blood pressure and cholesterol medications. Main Outcomes: The primary outcome was a composite outcome of cardiovascular mortality and MI and the secondary outcome was all-cause mortality. Results: The mean (SD) age was 58 (8) years, 45% men and 94% white. During a median follow-up of 14 (interquartile range 12.3 – 15) years, 7.9% of the population had an MI, 2.7% suffered cardiovascular death, 9.5% all-cause mortality. After adjusting for aforementioned demographic and clinical factors, as well as medication usage, each standard deviation increase in PLAUR levels was associated with a heightened risk of incident non-fatal MI and cardiovascular (CV) death, with a hazard ratio (HR) of 2.31 (95% CI 2.00-2.45), and all-cause mortality, with an HR of 3.81 (95% CI 3.48-4.18). Even after further adjustment for hs-CRP levels, PLAUR levels remained predictive of non-fatal MI and CV death (HR 2.03, 95% CI 1.83-2.26) and all-cause mortality (HR 3.43, 95% CI 3.12-3.77). Furthermore, in a fully adjusted Cox regression model, a significant interaction between PLAUR levels and sex (p = 0.0003) was observed in predicting the primary outcome. The interaction was found to have a stronger predictive value in females compared to males. Conclusion: PLAUR levels are a strong predictor of adverse cardiovascular outcomes in the general population, independent of traditional risk factors and inflammation.

Abstract 4132351: Soluble Urokinase Plasminogen Activator Receptor Levels Predict Incident Cardio-Kidney-Metabolic Disease Risk

Introduction: Given the rising global incidence of cardio-kidney-metabolic (CKM) syndrome, there is an urgent need for novel risk prediction strategies for CKM disease. Hypothesis: As soluble urokinase plasminogen activator receptor (suPAR) levels have been associated with the development of cardio-kidney disease, we hypothesized that elevated suPAR levels would predict incident CKM disease risk. Methods: A total of 25,596 UK Biobank participants without CKM disease at enrollment were analyzed for the association of suPAR levels and incident CKM disease. CKM disease was defined as the first occurrence of CVD (heart failure, atrial fibrillation/flutter, coronary heart disease, stroke, and peripheral artery disease), chronic kidney disease (CKD), or metabolic disease (type 2 diabetes mellitus and obesity). Incident CVD, CKD, and metabolic disease were also analyzed separately as secondary outcomes. Kaplan-Meier analysis was performed to visualize the association between suPAR levels and the primary composite CKM outcome. Competing-risk regression, while accounting for competing non-CKM disease death, was performed to examine the association between suPAR levels and the primary composite CKM outcome. Models were adjusted for demographics, traditional risk factors, and CRP levels. Results: The mean age was 56.0 (SD 8.3) years, 44% were male, and 94% were White. suPAR levels were associated with a significantly higher rate of composite CKM events (P&lt;0.001) (Figure 1). During a median follow-up of 13.5 [IQR 1.7] years, 5,012 (20.0%) composite CKM events, 3,599 (8.3%) incident CVD events, 863 (3.4%) incident CKD events, and 1,397 (4.7%) incident metabolic disease events occurred. suPAR levels (per SD) significantly predicted the primary composite CKM outcome (sHR 1.23, 95% CI 1.19-1.27) after adjustment. suPAR levels (per SD) also significantly predicted incident CVD (sHR 1.24, 95% CI 1.19-1.29), incident CKD (sHR 1.41, 95% CI 1.30-1.53), and incident metabolic disease (sHR 1.17, 95% CI 1.10-1.24) after adjustment. Conclusion(s): In this large, longitudinal cohort study of UKB participants, plasma suPAR levels were a significant predictor of CKM disease risk, independent of demographics, traditional risk factors, and CRP levels.

STEM-17. THE UROKINASE RECEPTOR AS A NOVEL IMMUNOTHERAPEUTIC TARGET IN BRAIN CANCERS

Abstract Glioblastoma (GBM) is the common malignant brain tumor in adults, accounting for approximately 15% of all CNS tumors, and 48.6% of malignant brain tumors, with a median survival of approximately 15 months. GBM is characterized by extensive inter- and intra-tumoral heterogeneity and an extremely immunosuppressive tumor microenvironment. Following Standard-of-Care surgical resection and chemoradiotherapy, patients inevitably relapse, at which point few therapeutic avenues exist, owing in part due to a lack of clinically relevant targets. Data from our target identification pipeline shows the urokinase plasminogen activator receptor (uPAR) is significantly upregulated at recurrence on putative GBM brain tumor initiating cells (BTICs), which are believed to drive de novo tumor formation, recurrence, and therapeutic resistance. uPAR plays an important role in the plasminogen activation system, and in the context of cancer, has been implicated in numerous pro-tumorigenic processes such as invasion, proliferation, and therapy resistance. We used CRISPR-Cas9 to genetically delete uPAR from our in-house patient-derived GBM cell lines, and found that knockout of uPAR in recurrent GBM cells significantly reduces various functional characteristics of BTICs in vitro. In our patient-derived mouse model of GBM, we found that knockout of uPAR significantly increases survival, and decreases tumor burden. Further, we generated novel anti-uPAR single domain antibodies (sdAbs) which specifically and efficiently bind uPAR at low nanomolar concentrations in vitro. We developed anti-uPAR CAR Ts using the binder sequence of the sdAbs, which showed potent cytotoxicity in vitro, and drastically reduced tumor burden and extended survival in vivo. Further, we identified uPAR as being highly expressed on brain metastases from multiple origins (lung-to-brain, melanoma-to-brain, etc.), and demonstrate that anti-uPAR CAR Ts effectively kill brain metastases in vitro, and significantly extend survival using in vivo brain metastasis models. From this work we believe uPAR to be a clinically relevant target in both recurrent GBM and brain metastases, and investigation into therapeutic strategies targeting uPAR-positive brain cancers should be explored further.

Significance of myeloperoxidase, pentraxin-3 and soluble urokinase plasminogen activator receptor determination in patients with moderate carotid artery stenosis

We investigated serum concentrations of specific inflammatory parameters in patients with significant carotid artery stenosis (CAS) of 50–99%, with an additional focus on patients with moderate stenosis (50–69%), in terms of both symptomatic status and plaque morphology, to determine whether there are certain parameters that can be associated with plaque instability before the progression of CAS to a high degree. The study included 119 CAS patients, 29 of whom had moderate stenosis, and 46 controls. Ultrasonography of the carotid arteries was performed using color flow Doppler and B-mode duplex ultrasound, and serum inflammatory parameters were measured using commercially available enzyme immunoassays. When comparing patients with 50–99% stenosis, only serum amyloid A (SAA) was higher in symptomatic patients, while in the group of patients with 50–69% stenosis, myeloperoxidase (MPO) was higher and pentraxin-3 (PTX-3) was lower in symptomatic compared to asymptomatic patients, and soluble urokinase plasminogen activator receptor (suPAR) was higher in patients with carotid plaque of unstable compared to stable morphology. Our results suggest that the importance of different inflammatory parameters in patients with moderate CAS is not the same as in CAS patients in general, and therefore their separate investigation in patients with high and moderate stenosis may be beneficial. SAA has the potential to be further considered in research to predict CAS symptom risk. There is a possibility that MPO and PTX-3 play a role in the development of CAS symptoms originating from less stenotic plaques and that suPAR is involved in the destabilisation of such plaques.

Bone morphogenetic protein-4 induced matrix turnover and osteogenic differentiation-related molecules of stem cells from apical papilla and its associated ALK/Smad signaling

Background/purposeRevascularization procedures are used over apexification to treat teeth with necrotic pulp tissues and incomplete root formation. Clinically, inducing proliferation, migration, matrix deposition, and differentiation of stem cells from apical papilla (SCAPs) are critical for pulp regeneration. The study aimed to elucidate the impact of bone morphogenetic protein-4 (BMP-4) on plasminogen activation molecules and the osteogenic/odontogenic differentiation of SCAPs, as well as understand the related signaling mechanisms. Materials and methodsSCAPs were exposed to BMP-4 with or without signal transduction inhibitors. Cell viability was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. mRNA levels were quantified using real-time PCR. Protein expression in SCAPs was analyzed through immunofluorescent staining or western blotting. Cellular protein production was measured with enzyme-linked immunosorbent assay. ResultsBMP-4 induced suppressor of mother against decapentaplegic (Smad)1/5/8 and Smad2/3 phosphorylation and activation. It also promoted higher expression of osteogenic and odontogenic markers, including Osterix, N-cadherin, and secreted protein acidic and rich in cysteine (SPARC), in SCAPs. Additionally, BMP-4 stimulated connective tissue growth factor (CTGF), plasminogen activator inhibitor-1 (PAI-1), and urokinase plasminogen activator receptor (uPAR) expression, but inhibited uPA expression and production in SCAPs, indicating its role in matrix remodeling and cell migration. Inhibition of Smad2/3 with SB431542 and Smad1/5/8 with LDN193189 attenuated the BMP-4-induced expression Osx, N-cadherin, CTGF, SPARC, uPAR and PAI-1. ConclusionThese results indicate that BMP-4 stimulates the osteogenic and odontogenic differentiation of SCAPs by regulating matrix turnover and mineralization-related proteins. Furthermore, these processes are associated with the induction of Smad2/3 and Smad1/5/8 of SCAPs by BMP-4.

The cardioprotective potential of soluble urokinase Plasminogen Activator Receptor (suPAR) in myocardial ischemia

Abstract Background and aims: Increased circulating soluble urokinase plasminogen activator receptor (suPAR) levels are associated with adverse cardiovascular outcomes, however, any cardiovascular-related functions remain unknown. This study aimed to (i) document haemodynamic profiles in isolated rat hearts under the influence of suPAR, and to (ii) explore any mechanisms triggered by suPAR following myocardial ischaemia-reperfusion. Methods We undertook a 4-pronged approach (Figure 1). A Langendorff isolated rat heart model was used to perfuse all hearts with Krebs-Henseleit solution flowing retrogradely through the aorta at 37°C. A balloon inserted into the left ventricle allowed measurements of ventricular pressure, and a pressure transducer placed above the aorta recorded perfusion pressure for coronary flow rates. The experimental protocol consisted an initial 30-minute stabilisation period, followed by 40 minutes of ischemia via buffer flow cessation. Hearts were subsequently recovered during 90 minutes of reperfusion, receiving either suPAR treatment or perfusion buffer as controls. An inhibitor arm comprising co-infusion of suPAR and a monoclonal antibody capable of binding to suPAR was also assessed. Troponin T was measured in outflow perfusates collected at specific intervals. Proteins from hearts in treatment groups were separated using gel electrophoresis, with Western blotting to visualise the phosphorylation status of kinases (Akt, STAT). High-flow respirometry and fluorometry were investigated in cardiac mitochondria to determine respiration rates and ATP production in ischaemia reperfusion under the influence of suPAR. Statistical analysis was conducted with ANOVA using SPSS. Results Hearts receiving suPAR infusion at reperfusion (n = 16) showed a significant increase in developed pressure (p = .017) and lower perfusion pressure (p = .02) compared to controls (n = 16), revealing that suPAR-treated hearts recovered with better contractility and vasodilatory properties post-ischaemia. suPAR’s haemodynamic profiles in the antibody group were similar to controls, attenuating suPAR-induced effects (n = 8). Outflow effluents in suPAR-treated hearts obtained &amp;gt;3 fold lower serial Troponin T values than controls (p &amp;lt; .001). Heart tissues receiving suPAR treatment revealed a 1.7-fold increase in Akt (p = .001) and a 3.8-fold increase in STAT3 phosphorylation compared to controls (p &amp;lt; .001) and the inhibitor group (p = .04). Finally, suPAR increased mitochondrial ATP production by 28% (p = .013) compared to controls after ischaemia. Conclusion This is a world-first demonstration of suPAR’s cardioprotective influences in isolated rat hearts recovering from ischaemia. suPAR’s ability to promote cardiac contractility and vasodilation was associated with lesser injury as shown by Troponin T reduction. Mechanistically, suPAR infusion upregulated two key cardioprotective pathways, which may also function to protect cardiac mitochondria.Figure 1 - Schematic of Methods

Prognostic value of soluble urokinase plasminogen activator receptor (suPAR) in patients admitted with acute heart failure

Abstract Introduction The inflammatory marker, soluble urokinase plasminogen activator receptor (suPAR), has emerged as a promising prognostic biomarker of heart failure (HF). Higher levels of suPAR in plasma are indicative of hospital readmissions and mortality. Currently little is known about suPAR-values upon admission in patients with acute heart failure (AHF). Purpose This study investigates the prevalence of elevated suPAR and prognostic value in patients hospitalized with AHF. Methods In this prospective cohort study, all patients ≥ 18 years old admitted at the Emergency Department at a large University Hospital in Denmark, were consecutively included from March 10, 2020, to March 31, 2022. The follow-up period was 365 days. The biomarker suPAR was measured in all patients upon admission (median time from admission to suPAR measurement was two hours (IQR 3: 3,9-6,9)). Patient data was extracted from the electronic patient record system, and a cardiologist adjudicated whether the patients had AHF. Patients were stratified according to validated cut-off values of suPAR above or below 6 ng/mL. Kaplan-Meier survival analysis and Cox Regression were used to assess the association between suPAR levels and one-year mortality outcomes. Results A total of 408 (5%) AHF patients, from a total population of 6,715, were included in the study. 40 patients were excluded due to missing suPAR-values and the final analysis comprised of 368 AHF patients. Among AHF patients upon admission, the mean suPAR value was 6.2 ng/mL (standard deviation [SD] = 4.8 ng/mL), and non-AHF patients had a mean value of 4.5 ng/mL (SD = 3.1 ng/mL). A suPAR level above 6 ng/mL was significantly associated with mortality (figure 1), log-rank test p-value &amp;lt; 0.0001. Furthermore, Cox regression analysis demonstrated that elevated suPAR levels were independently associated with increased risk of mortality with a hazard ratio (HR): 2.09 (95% CI: 1.59-2.90), p-value &amp;lt; 0.001 after adjusting for potential confounders: age, sex, atrial fibrillation, Chronic Obstructive Pulmonary Disease, and Creatinine levels. Conclusion The inflammatory biomarker suPAR measured upon hospital admission in AHF patients is significantly associated with one-year mortality in patients admitted with AHF. The potential of suPAR as a valuable prognostic marker in AHF is offering clinicians a tool to identify high-risk patients and tailor management strategies, accordingly, thereby improving patient outcomes.Figure 1 - 1 year mortality

Evaluation of Soluble Urokinase Plasminogen Activator Receptor in COVID-19 Patients.

Background/Objectives: This retrospective study analyzed soluble urokinase plasminogen activator receptor (suPAR) plasma levels alongside routine inflammatory markers, including the neutrophil-to-lymphocyte count ratio, C-reactive protein (CRP), interleukin-6 (IL-6), procalcitonin (PCT), and D-dimers in COVID-19 patients hospitalized during the Omicron wave of the pandemic. Methods: We measured plasma suPAR levels using a suPARnostic® Quick Triage kit. We divided COVID-19 patients into two groups based on the severity of SARS-CoV-2 infection according to the National Institutes of Health (NIH) criteria. The logistic regression analysis tested the predictive value of the biomarkers. Results: We evaluated 160 consecutive COVID-19 patients hospitalized between January and August 2022. The cohort exhibited a high incidence of comorbidities, with an in-hospital mortality rate of 5.6%. Upon admission, the median suPAR plasma levels were not significantly different between patients with mild COVID-19 (n = 110) and those with moderate/severe disease (n = 50), with 7.25 ng/mL and 7.55 ng/mL, respectively. We observed significant differences (p < 0.01) between the groups for CRP and IL-6 levels that were higher in moderate/severe disease than in mild infection. Additionally, suPAR plasma levels were above the normal range (0-2.00 ng/mL) in all patients, with a significant positive correlation identified between suPAR levels and serum IL-6, PCT, and creatinine levels. Conclusions: These findings indicate that COVID-19 during the Omicron wave is strongly associated with elevated suPAR levels; however, these levels do not directly correlate with the severity of SARS-CoV-2 infection.

Pulmonary Congestion and Anemia in Hemodialysis: The Potential Link to Inflammation

Pulmonary congestion (PC) is common in hemodialysis (HD) patients. We explored the association of anemia and pulmonary congestion in HD patients. A prospective pilot observational study included 18 patients on maintenance HD. Individual B-lines scores (BLS; 8-sites method) were obtained by lung ultrasound, before and after the first two consecutive HD sessions of the week (HD1-HD2), with different inter-dialytic intervals (68 vs. 44 h). Bioimpedance spectroscopy body composition (BIS) was performed before each HD session. Hemoglobin (Hb) levels, in addition to circulating markers of chronic inflammation (soluble urokinase Plasminogen Activator Receptor [suPAR], soluble Suppression of Tumorigenicity 2 [sST2]) were obtained. Mean (±SD) BLS values were quite elevated at all time points: Pre-HD1 (16 ± 5.53), post-HD1 (15.3 ± 6.63), pre-HD2 (16.3 ± 5.26) and post-HD2 (13.6 ± 5.83), respectively. No direct significant correlation was found between inflammation markers levels and BLS. However, mean levels (±SD, ng/mL) of suPAR pre-HD1 (7.88 ± 3.07) and pre-HD2 (7.78 ± 3.02) remained significantly above the normal range (&lt;4 ng/mL), and sST2 levels reached 2-fold the upper normal value in most patients (27.4 ± 17.8). Pulmonary congestion reflected by BLS was negatively correlated to Hb levels pre-HD1 (R² = 0.439, p = 0.003), and pre-HD2 (R² = 0.301, p = 0.018). In addition, Hb levels were negatively correlated to global volume status estimated by BIS (R² = 0.351, p = 0.009). Hemoglobin levels were negatively correlated to pulmonary congestion and to the global volume status evaluated by BIS. Chronic inflammation markers were increased in HD patients, suggesting a complex volume- and non-volume-dependent pathophysiology of pulmonary congestion in HD patients.

Soluble Urokinase Plasminogen Activator Receptor as a Predictor of All-Cause Death in Patients Undergoing Coronary Angiography at 10-Year Follow-Up.

Background: We aimed to explore the predictive role of soluble urokinase plasminogen activator receptor (suPAR) in patients undergoing coronary angiography by systematically evaluating its association with adverse cardiovascular events at 10 years follow-up. Methods: The KORONEF study was a single-center, observational, prospective study with 492 subjects included. In the multivariable Cox regression model, we checked the impact of suPAR, neutrophil elastase, myeloperoxidase, and DNase 1 on long-term outcomes. Results: The mean study population age was 64.4 ± 9.9 years, and there were 37.2% women. We divided the population into tertiles of suPAR levels (T1 0.793-2.135 ng/mL; T2 2.136-2.868 ng/mL; and T3 2.872-8.677 ng/mL). Patients with higher suPAR concentrations were more often females (tertile 1 vs. tertile 3: 27.4% vs. 50.6%, p < 0.001) and older age (60.8 ± 8.7 years vs. 68.8 ± 9.5 years, p < 0.001). They also characterized higher incidence of diabetes (17.7% vs. 38.0%, p < 0.001), previous myocardial infarction (22% vs. 44.8%, p < 0.001), and chronic kidney disease (3% vs. 18.4%, p < 0.001), but lower incidence of dyslipidemia (54.3% vs. 35.6%). The 10-year all-cause death rates were 14.6% vs. 34.1%, HR 2.68, 95% CI 1.66-4.33, p < 0.001 for tertile 2, and 14.6% vs. 39.9%, HR 3.24, 95% CI 2.03-5.17, p < 0.001 for tertile 3. The optimal cut-off suPAR value of 2.39 ng/mL provided a sensitivity of 66.9% and a specificity of 54.6% in predicting all-cause death. Conclusions: The association of elevated suPAR with increased mortality risk suggests its potential relevance in predicting long-term outcomes and may help inform more individualized management strategies for high-risk patients.

UPAR Immuno-PET in Pancreatic Cancer, Aging, and Chemotherapy-Induced Senescence.

Identifying cancer therapy resistance is a key time-saving tool for physicians. Part of chemotherapy resistance includes senescence, a persistent state without cell division or cell death. Chemically inducing senescence with the combination of trametinib and palbociclib (TP) yields several tumorigenic and prometastatic factors in pancreatic cancer models with many potential antibody-based targets. In particular, urokinase plasminogen activator receptor (uPAR) has been shown to be a membrane-bound marker of senescence in addition to an oncology target. Methods: Here, 2 antibodies against murine uPAR and human uPAR were developed as immuno-PET agents to noninvasively track uPAR antigen abundance. Results: TP treatment increased cell uptake both in murine KPC cells and in human MiaPaCa2 cells. In vivo, subcutaneously implanted murine KPC tumors had high tumor uptake with the antimurine uPAR antibody independently of TP in young mice, yet uPAR uptake was maintained in aged mice on TP. Mice xenografted with human MiaPaCa2 tumors showed a significant increase in tumor uptake on TP therapy when imaged with the antihuman uPAR antibody. Imaging with either uPAR antibody was found to be more tumor-selective than imaging with [18F]FDG or [18F]F-DPA-714. Conclusion: The use of radiolabeled uPAR-targeting antibodies provides a new antibody-based PET imaging candidate for pancreatic cancer imaging as well as chemotherapy-induced senescence.

Serum Soluble Urokinase Plasminogen Activator Receptor in Diabetic Nephropathy

Abstract Background Diabetes mellitus (DM) is a rapidly growing global health problem. Persistent hyperglycemia in uncontrolled DM can cause several complications including diabetic retinopathy and nephropathy. The prognostic value of serum soluble urokinase-type plasminogen activator (suPAR) levels across diseases positions suPAR as a new promising inflammatory biomarker. Elevated suPAR levels are strongly associated with decline in kidney function. Objective The aim of this study is to investigate the prognostic value of suPAR in patients with DM and its capacity as a biomarker for renal impairment severity. Patients and Methods This study included 180 subjects divided into 2 age and gender matched groups; the first group consisted of 140 diabetic patients and the second group consisted of 40 apparently healthy controls. Serum urokinase plasminogen activator receptor was measured for all subjects Results SuPAR showed significantly higher values among patients with DN when compared with those without DN. There was a statistically significant positive correlation found between suPAR level and albumin/creatinine ratio and serum creatinine level in all diabetic patients. There was a statistically significant negative correlation found between suPAR level and eGFR in all diabetic patients. Conclusion In conclusion, suPAR appears to be a promising biomarker, indicating early diagnosis of diabetic nephropathy in patients with DM.

Correlation between vascular endothelial growth factor, soluble urokinase plasminogen activator receptor, and tricuspid annular plane systolic excursion/systolic pulmonary artery pressure ratio in group E chronic obstructive lung disease.

Vascular endothelial growth factor is a signaling protein created by cells performing important bodily functions. Vascular endothelial growth factor is abundant in the lung, and plasma levels are elevated in patients with severe pulmonary arterial hypertension. An association between soluble urokinase plasminogen activator receptor, an inflammatory biomarker, and soluble urokinase plasminogen activator receptor levels and interstitial pulmonary and vascular involvement (e.g., development of pulmonary hypertension) has been shown in SSc patients. The tricuspid annular plane systolic excursion/systolic pulmonary artery pressure ratio, which has been recommended as a useful diagnostic tool in the last guideline, is one of the additional echocardiographic signs suggestive of pulmonary hypertension. We aimed to examine whether these biomarkers contribute to the diagnosis and management of pulmonary hypertension. Patients with group E chronic obstructive lung disease were included in this prospective study. Demographic data, echocardiographic signs about the right ventricle (right atrium area, tricuspid annular plane systolic excursion/systolic pulmonary artery pressure, fractional area change, and right ventricular outflow tract), and peripheral blood analysis were examined and recorded. A total of 70 patients, 12 of whom were female, were analyzed in the study. The mean age was 66.6±8.7 years. The mean vascular endothelial growth factor-A and soluble urokinase plasminogen activator receptor were 91.05±70.7 and 955.8±571.1, and their Pearson correlation coefficients between vascular endothelial growth factor-A and tricuspid annular plane systolic excursion/systolic pulmonary artery pressure, and soluble urokinase plasminogen activator receptor and tricuspid annular plane systolic excursion/systolic pulmonary artery pressure ratio were 0.341 (p=0.004) and -0.045 (p=0.70), respectively. The linear regression model included four variables with significant correlation (vascular endothelial growth factor-A, right atrium area, fractional area change, and right ventricular outflow tract). Three steps were performed, and adjusted r2 was 0.22, 0.22, 0.20, and p<0.001 for each step. Vascular endothelial growth factor-A and right ventricular outflow tract remained in the last step. It was detected a standardized coefficient beta of 0.322 (p=0.004) and a 95%CI 0.000-0.001 for vascular endothelial growth factor-A. Vascular endothelial growth factor-A is correlated with the tricuspid annular plane systolic excursion/systolic pulmonary artery pressure ratio and not with soluble urokinase plasminogen activator receptor.

The mechanosensitive ion channel Piezo1 contributes to podocyte cytoskeleton remodeling and development of proteinuria in lupus nephritis.

Piezo1 functions as a special transducer of mechanostress into electrochemical signals and is implicated in the pathogenesis of various diseases across different disciplines. However, whether Piezo1 contributes to the pathogenesis of lupus nephritis (LN) remains elusive. To study this, we applied an agonist and antagonist of Piezo1 to treat lupus-prone MRL/lpr mice. Additionally, a podocyte-specific Piezo1 knockout mouse model was also generated to substantiate the role of Piezo1 in podocyte injury induced by pristane, a murine model of LN. A marked upregulation of Piezo1 was found in podocytes in both human and murine LN. The Piezo1 antagonist, GsMTx4, significantly alleviated glomerulonephritis and tubulointerstitial damage, improved kidney function, decreased proteinuria, and mitigated podocyte foot process effacement in MRL/lpr mice. Moreover, podocyte-specific Piezo1 deletion showed protective effects on the progression of proteinuria and podocyte foot process effacement in the murine LN model. Mechanistically, Piezo1 expression was upregulated by inflammatory cytokines (IL-6, TNF-α and IFN-γ), soluble urokinase Plasminogen Activator Receptor and its own activation. Activation of Piezo1 elicited calcium influx, which subsequently enhanced Rac1 activity and increased active paxillin, thereby promoting cytoskeleton remodeling and decreasing podocyte motility. Thus, our work demonstrated that Piezo1 contributed to podocyte injury and proteinuria progression in LN. Hence, targeted therapy aimed at decreasing or inhibiting Piezo1 could represent a novel strategy to treat LN.

Tacrolimus Therapy Among Steroid-Resistant Nephrotic Syndrome Children: A Preliminary Study in West Java, Indonesia

Objective: To explore the outcomes of Tac therapy for Steroid-Resistant Nephrotic Syndrome (SRNS) and its implication in reducing the number of CKD events.Methods: An open, prospective, cohort study was conducted at a tertiary hospital in Bandung, West Java, Indonesia. Children (age 1–18 years old) with steroid and cyclophosphamide resistant nephrotic syndrome were enrolled in this study. Blood pressure, urinary protein, serum ureum, and creatinine levels were measured every month, Tac and soluble urokinase plasminogen activator receptor (supaR) levels were assessed at the 0, third, and sixth months.Results: Ten of fifteen subjects enrolled in this study got better within 3–6 months with a trend of decreasing suPAR level and proteinuria, as well as stable blood pressure and serum creatinine and ureum level. During treatment, no side effects of the subjects were found with the Tac level maintain safely.Conclusion: Tac is an effective and safe agent in treating SRNS, especially for those do not respond well to an alkylating agent.

Soluble urokinase plasminogen activator receptor (suPAR) is a potential biomarker of stage III-IV, grade C periodontitis through the impact of post-radiotherapy on head and neck cancer patients

BackgroundThe urokinase-type plasminogen activator receptor (uPAR) plays an essential function in leukocytes and endothelial homeostasis and, therefore, in the development of chronic periodontitis.MethodsThe study enrolled 150 participants, 50 chronic periodontitis with head and neck cancer post radiotherapy (CP + HNC post-RT) patients, 50 chronic periodontitis (CP) without HNC patients, and 50 healthy controls. Clinical Attachment Loss (CAL), Probing Pocket Depth (PPD), Plaque Index (PI), and Gingival Bleeding Index (GBI) were recorded. An enzyme-linked immunosorbent assay (ELISA) was constructed to quantify serum (suPAR) levels.ResultsStage and grade of periodontitis were stage III-IV, grade C in patients (CP + HNC post-RT), stage I-III, grade A/B in patients (CP without HNC), and absent in (healthy). Chronic periodontitis with HNC post-RT patients presented a significantly higher proportion of suPAR levels (506.7 pg/ml) compared to chronic periodontitis without HNC and healthy controls (423.08 pg/ml and 255.9 pg/ml), respectively. A significant positive correlation was found between serum suPAR levels and CAL, PPD, PI, and GBI in the periodontal disease groups. ROC results of suPAR (AUC = 0.976 for CP + HNC post-RT, AUC = 0.872 for CP without HNC). Hyposalivation appeared in patients (CP + HNC post-RT; 0.15 [0.11–0.23] ml/min, P = 0.001) and (CP without HNC; 0.30 [0.25–0.41] ml/min, P = 0.001), compared to healthy controls; 0.35 [0.28–0.54] ml/min, P = 0.001).ConclusionThe study showed a significant elevation in serum suPAR levels in CP + HNC post-RT patients compared to the CP without HNC and control groups.Clinical trial registrationThe study was registered retrospectively; clinicaltrials.gov identifier: NCT06529588. Date of registration: July 31, 2024 https://clinicaltrials.gov/study/NCT06529588.

Biomarkers of COVID-19 short-term worsening: a multiparameter analysis within the prospective multicenter COVIDeF cohort.

During a pandemic like COVID-19, hospital resources are constrained and accurate severity triage of the patients is required. The objective of this study is to estimate the predictive performances of candidate biomarkers for short-term worsening (STW) of COVID-19. Prospective, multicenter (20 hospitals in Paris) cohort study of consecutive COVID-19 patients with systematic biobanking at admission, during the first waves of COVID-19 in France in 2020 (COVIDeF cohort). Consecutive COVID-19 patients were screened for inclusion. They were excluded in presence of severity criteria defined by either an ICU admission, mechanical ventilation (including noninvasive ventilation), acute respiratory distress, or in-hospital death before sampling. Routine blood tests measured during usual care and centralized systematic measurement of creatine kinase, C-reactive protein (CRP), procalcitonin, soluble urokinase plasminogen activator receptor (suPAR), high-sensitive troponin T (TnT-hs), N terminal pro-B natriuretic peptide (NT-proBNP), calprotectin, platelet factor 4, mid-regional pro-adrenomedullin (MR-proADM), and proendothelin were performed. The primary outcome was STW, defined by a severity criteria within 7 days. A backward stepwise logistic regression model and a 'best subset' approach were used to identify independent association, and the area under the receiving operator characteristics (AUROC) was computed. Five hundred and eleven patients were analyzed, of whom 60 (11.7%) experienced STW. Median time to occurrence of a severity criteria was 3 days. At admission, lower values of eosinophils, lymphocytes, platelets, alanine aminotransferase, and higher values of neutrophils, creatinine, urea, CRP, TnT-hs, suPAR, NT-proBNP, calprotectin, procalcitonin, MR-proADM, and proendothelin were predictive of worsening. Stepwise logistic regression identified three biomarkers significantly associated with worsening: CRP [adjusted odds ratio (aOR): 1.10, 95% confidence interval (95% CI): 1.06-1.15 for a 10-unit increase, AUROC: 0.73 (0.66-0.79)], procalcitonin [aOR: 0.42, 95% CI: 0.22-0.81, AUROC: 0.69 (0.64-0.88)], and MR-proADM [aOR: 2.85, 95% CI: 1.74-4.69, AUROC: 0.75 (0.69-0.81)]. These biomarkers outperformed clinical variables except diabetes and cancer comorbidities. In this multicenter prospective study that assessed a large panel of biomarkers for COVID-19 patients, CRP, procalcitonin, and MR-proADM were independently associated with the risk of STW. ClinicalTrials.gov NCT04352348.

A characterization of patients with low soluble urokinase plasminogen activator receptor who died within 90 days of hospital discharge.

Soluble urokinase plasminogen activator receptor (suPAR) is a marker of systemic chronic inflammation. Elevated suPAR levels are associated with adverse clinical outcomes, but a small subset of patients with low suPAR also experience poor outcomes. Therefore, we aimed to characterize patients presenting to the emergency department with low suPAR (<3 ng/mL) who died within 90 days after discharge in a registry-based study. Compared to patients with low suPAR who survived (n = 15 122), those who died within 90 days (n = 87) had higher age (75.4 years), higher medication use (7.0; 71.3% with polypharmacy) and more blood tests outside reference intervals (5.0) (including C-reactive protein, neutrophils and albumin), and the most common diagnoses were chronic pulmonary disease (27.6%), cerebrovascular disease (18.4%) and dementia (11.5%). Patients with low suPAR were more morbid than what was reflected by suPAR alone. Future studies must determine which factors that contribute the most to potential algorithms when stratifying patients based on their risk of adverse clinical outcomes. These data indicate that inclusion of medication data could be relevant.

Improving prognostication of pneumonia among elderly patients: usefulness of suPAR

PurposeElderly patients with suspected pneumonia represent a significant proportion of hospital admissions, which is a prognostic challenge for physicians. Our research aimed to assess the prognosis of patients with pneumonia using soluble urokinase plasminogen activator receptor (suPAR) combined with clinical data.MethodsIn a prospective observational study including 164 patients > 65 years (mean age 84.2 (+/-7.64) years) who were hospitalized for a suspicion of pneumonia, suPAR was assessed for each patient, as was the prognosis score (PSI, CURB65) and inflammatory biomarkers (C-reactive protein, procalcitonin, white blood cells). The prognostic value of the suPAR for 30-day mortality was assessed using receiver operating characteristic (ROC) curve analyses. Optimal cut-offs with corresponding sensitivity (SE) and specificity (SP) were determined using the Youden index.ResultsA suPAR > 5.1 ng/mL was predictive of 30-day mortality with a sensitivity of 100% and a specificity of 40.4%. A combination of the following parameters exhibited an SE of 100% (95% CI, 100–100) for an SP value of 64.9% (95% CI, 57.6–72.2) when at least two of them were above or below the following cut-off threshold values: suPAR > 9.8 ng/mL, BMI < 29.3 kg/m2 and PSI > 106.5.ConclusionThe suPAR seems to be a promising biomarker that can be combined with the PSI and BMI to improve the prognosis of pneumonia among elderly patients. Prospective studies with larger populations are needed to confirm whether this new approach can improve patient outcomes.Trial registrationClinicalTrials.gov (NCT02467192), 27th may 2015.