Publications by authors named "Sammy Patyna"

Background: Chronic kidney disease represents one of the strongest risk factors for cardiovascular diseases, and particularly for heart failure. Despite improved pharmaceutical treatments, mortality remains high. Recently, experimental studies demonstrated that mosaic loss of Y chromosome (LOY) associates with cardiac fibrosis in male mice.

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  • The study investigates how the Influenza A virus (IAV) affects human kidney cells, specifically looking at the mechanisms behind acute kidney injury (AKI) during IAV infection.
  • Researchers conducted various experiments, including infectivity assays and transcriptome/proteome analyses, revealing that IAV can replicate effectively in kidney cells.
  • Findings suggest that regulated cell death plays a key role in kidney damage due to IAV, highlighting potential targets for treatment to mitigate kidney-related complications.
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  • Marburg virus causes Marburg virus disease (MVD), a severe hemorrhagic fever with a high fatality rate, and can lead to acute kidney injury, though the exact mechanisms remain unclear.
  • Studies show viral proteins in nephron cells, particularly in proximal tubular cells (PTC), indicating the virus might contribute to kidney damage in MVD.
  • Research involving human PTC revealed that while the virus replicates significantly, it doesn't cause immediate cell death, instead leading to downregulation of crucial genes for kidney function and upregulation of inflammatory response genes.
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Hemodialysis patients faced an excess morbidity and mortality during the COVID-19 pandemic. We evaluated the effect of second-generation mRNA vaccines against Omicron BA.4 and BA.

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Surgical aortic valve replacement (SAVR) in kidney transplant recipients (KTR) is associated with high morbidity and mortality, and an increased risk of postoperative graft failure potentially leading to graft loss. Transcatheter aortic valve implantation (TAVI) emerged as an alternative in high-risk patients. However, data on TAVI in kidney transplant recipients are limited.

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The long-term effect of protection by two doses of SARS-CoV-2 vaccination in patients receiving chronic intermittent hemodialysis (CIHD) is an urging question. We investigated the humoral and cellular immune response of 42 CIHD patients who had received two doses of SARS-CoV-2 vaccine, and again after a booster vaccine with mRNA-1273 six months later. We measured antibody levels and SARS-CoV-2-specific surrogate neutralizing antibodies (SNA).

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S1P and its receptors have been reported to play important roles in the development of renal fibrosis. Although S1P has barely been investigated so far, there are indications that it can influence inflammatory and fibrotic processes. Here, we report the role of S1P in renal inflammation and fibrosis.

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Introduction: Prognosis of survivors from cardiac arrest is generally poor. Acute kidney injury (AKI) is a common finding in these patients. In general, AKI is well characterized as a marker of adverse outcome.

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  • Several studies show changes in specific sphingolipids in patients with kidney diseases, leading us to investigate these changes in kidney tissue from patients and mouse models of renal fibrosis.
  • Human kidney samples were obtained from patients undergoing nephrectomy and compared with healthy tissue, while mouse models of fibrosis were created using dietary changes and ureteral obstruction, with sphingolipid levels measured using LC-MS/MS.
  • The results indicated a significant decrease in specific long-chain ceramides in fibrotic kidney tissues, which corresponded with increased expression of fibrotic markers, suggesting that ceramide levels could be linked to kidney disease progression and might be useful as biomarkers.
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Introduction: Kidney transplant recipients (KTR) represent a high-risk population for cardiovascular disease. Coronary artery disease (CAD) is the most common cause of morbidity and mortality in this population. In KTR, coronary angiography and intervention (CI) can be associated with the risk of acute kidney injury (AKI).

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  • Lupus nephritis (LN) is a severe form of kidney damage associated with systemic lupus erythematosus (SLE), and conventional diagnostic methods remain invasive and unreliable.
  • Researchers conducted a study with 82 participants, including healthy controls, SLE patients without kidney issues, and LN patients, to examine the potential of blood-derived sphingolipids as noninvasive biomarkers for renal injury.
  • Results showed elevated levels of specific ceramides and sphinganine in LN patients compared to both healthy controls and SLE patients without kidney damage, indicating that these sphingolipids could serve as reliable indicators for diagnosing lupus nephritis.
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Dysregulation of blood sphingolipids is an emerging topic in clinical science. The objective of this study was to determine preanalytical biases that typically occur in clinical and translational studies and that influence measured blood sphingolipid levels. Therefore, we collected blood samples from four healthy male volunteers to investigate the effect of storage conditions (time, temperature, long-term storage, freeze⁻thaw cycles), blood drawing (venous or arterial sampling, prolonged venous compression), and sample preparation (centrifugation, freezing) on sphingolipid levels measured by LC-MS/MS.

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Purpose: Acute kidney injury (AKI) is a severe complication in medical and surgical intensive care units accounting for a high morbidity and mortality. Incidence, risk factors, and prognostic impact of this deleterious condition are well established in this setting. Data concerning the neurocritically ill patients is scarce.

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In selected cases, cuffed tunneled catheters via the iliac vein are implanted as a last resort access for hemodialysis. To monitor the correct position, sonography of the inferior vena cava (IVC) is sufficient in most cases. Position control using an X-ray of the abdomen is not routinely recommended when femoral catheters are implanted.

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