{"title":"Alport syndrome: an update.","authors":"Judy Savige","doi":"10.1097/MNH.0000000000001063","DOIUrl":"10.1097/MNH.0000000000001063","url":null,"abstract":"<p><strong>Purpose of review: </strong>The recent widespread availability of genetic testing has resulted in the diagnosis of many more people with Alport syndrome. This increased recognition has been paralleled by advances in understanding clinical consequences, genotype-phenotype correlations and in the development of new therapies.</p><p><strong>Recent findings: </strong>These include the international call for a change of name to 'Alport spectrum' which better reflects the diverse clinical features seen with autosomal dominant and X-linked Alport syndrome; the demonstration of how common Alport syndrome is in people with haematuria, proteinuria, or kidney failure; the inability of current genetic testing to detect all pathogenic variants in suspected Alport syndrome; the different genotype-phenotype correlations for autosomal dominant and X-linked disease; and the novel treatments that are available including SGLT2 inhibitors for persistent albuminuria despite renin-angiotensin-aldosterone blockade, as well as early studies of gene-modifying agents.</p><p><strong>Summary: </strong>Autosomal dominant Alport syndrome is the commonest genetic kidney disease and X-linked Alport syndrome is the second commonest genetic cause of kidney failure. Both these diseases are frequently seen in the renal clinic, and clinicians should be aware of their likelihood in a person with persistent glomerular haematuria, proteinuria or kidney failure. Autosomal dominant Alport syndrome is so common that it also occurs coincidentally in other kidney diseases especially IgA nephropathy.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"206-211"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143001820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The history and future of online hemodiafiltration and online solutions in North America.","authors":"Clement Leduc, Narumi Tomisawa, Claudio Ronco, Kamyar Kalantar-Zadeh","doi":"10.1097/MNH.0000000000001051","DOIUrl":"10.1097/MNH.0000000000001051","url":null,"abstract":"<p><strong>Purpose of review: </strong>Online hemodiafiltration (OL-HDF) is a type of outpatient intermittent dialysis therapy using purified online dialysis fluid sourced from the city water supply. OL-HDF has been widely practiced in Europe and Japan, and its clinical effects have been reported for prevention of dialysis amyloidosis, inflammation, and dialysis hypotension.</p><p><strong>Recent findings: </strong>A randomized controlled trial of all-cause mortality in postdilution OL-HDF and high-flux hemodialysis groups with replacement fluid volumes >23 l/session (CONVINCE study) reported a lower risk of all-cause mortality with OL-HDF compared to conventional hemodialysis. Whereas USA had not previously adopted OL-HDF, in February 2024 Fresenius' 5008K received 510K FDA approval, Although efforts to purify dialysis water and systems using dialysis fluid for HDF, such as those from Aksys (2002) and Nephros (2012), had been made in the past in the USA, they did not gain widespread adoption. Neighboring Canada has been conducting OL-HDF using the Gambro AK200 (1999), Baxter Artis (2009), B. Braun Dialog+ (2010), B. Braun Dialog IQ (2021) and the Fresenius 5008 (2013), all of which have received Health Canada approval for OL-HDF.</p><p><strong>Summary: </strong>OL-HDF's introduction to the USA represents both a challenge and an opportunity for patient care and the nephrology community. As a potentially superior treatment for ESRD patients, OL-HDF enables larger volumes of exchange, reduces costs by creating online solutions to replace expensive offline fluids, makes HDF therapy affordable for outpatient setting, and may improve survival and quality of life. However, significant barriers - ranging from regulatory and reimbursement hurdles to infrastructural inadequacies - must be addressed. Whether OL-HDF can finally emerge as a transformational renal replacement therapy after its entry to the US healthcare system remains to be determined.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"254-258"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143440163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Challenges in standardizing preimplantation kidney biopsy assessments and the potential of AI-Driven solutions.","authors":"Karolien Wellekens, Priyanka Koshy, Maarten Naesens","doi":"10.1097/MNH.0000000000001064","DOIUrl":"10.1097/MNH.0000000000001064","url":null,"abstract":"<p><strong>Purpose of review: </strong>This review explores the variability in preimplantation kidney biopsy processing methods, emphasizing their impact on histological interpretation and allocation decisions driven by biopsy findings. With the increasing use of artificial intelligence (AI) in digital pathology, it is timely to evaluate whether these advancements can overcome current challenges and improve organ allocation amidst a growing organ shortage.</p><p><strong>Recent findings: </strong>Significant inconsistencies exist in biopsy methodologies, including core versus wedge sampling, frozen versus paraffin-embedded processing, and variability in pathologist expertise. These differences complicate study comparisons and limit the reproducibility of histological assessments. Emerging AI-driven tools and digital pathology show potential for standardizing assessments, enhancing reproducibility, and reducing dependence on expert pathologists. However, few studies have validated their clinical utility or demonstrated their predictive performance for long-term outcomes.</p><p><strong>Summary: </strong>Novel AI-driven tools hold promise for improving the standardization and accuracy of preimplantation kidney biopsy assessments. However, their clinical application remains limited due to a lack of proven associations with posttransplant outcomes and insufficient evaluation of predictive performance metrics. Future research should prioritize longitudinal studies using large-scale datasets, rigorous validation, and comprehensive assessments of predictive performance for both short- and long-term outcomes to fully establish their clinical utility.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"185-190"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143001823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Insights into proliferative glomerulonephritis with monoclonal immunoglobulin deposits - is it really monoclonal or not?","authors":"Samih H Nasr, Vincent Javaugue","doi":"10.1097/MNH.0000000000001061","DOIUrl":"10.1097/MNH.0000000000001061","url":null,"abstract":"<p><strong>Purpose of review: </strong>Proliferative glomerulonephritis with monoclonal immunoglobulin deposits (PGNMID), is a disease defined by the presence of glomerulonephritis with nonorganized mono-isotypic immunoglobulin (Ig) deposits. This review will discuss the pathogenesis of PGNMID and address novel techniques for detection of monoclonal Ig and pathologic B-cell clones and for distinguishing monoclonal from oligoclonal Ig deposits.</p><p><strong>Recent findings: </strong>Because of low detection rate of circulating monoclonal Ig and nephritogenic B-cell clones and emerging reports of PGNMID-IgG in children, it has been recently argued that many PGNMID-IgG3 cases may not be monoclonal lesions. A mass spectrometry-based method, serum matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry, has been shown to have superior sensitivity than immunofixation for detection of monoclonal Ig in PGNMID and other monoclonal gammopathy of renal significance (MGRS) lesions. Two novel sequencing techniques, RNA-based immunoglobulin repertoire sequencing and single-molecule real-time sequencing of monoclonal immunoglobulin, enable identification of the full-length variable sequence of monoclonal Ig, even in MGRS patients with low tumor burden and undetectable monoclonal Ig by conventional methods. Finally, staining of kidney biopsy for Ig light chain variable domain subgroups may allow for separation of true monoclonal from oligoclonal PGNMID.</p><p><strong>Summary: </strong>Novel sequencing, mass spectrometry, and immunofluorescence techniques have the potential to increase the detection rate of nephritogenic monoclonal Ig/B-cell clone and distinguish monoclonal from oligoclonal deposits in PGNMID.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"199-205"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142930833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evolving thresholds for the diagnosis of acute T cell mediated rejection.","authors":"Brian J Nankivell","doi":"10.1097/MNH.0000000000001072","DOIUrl":"10.1097/MNH.0000000000001072","url":null,"abstract":"<p><strong>Purpose of review: </strong>The Banff schema uses combinations of pathological lesions at predefined thresholds to diagnose of T cell rejection (TCMR) and grade its severity. Constant definitional changes have caused confusion among clinicians and pathologists. This review describes the evolution of lesion definitions and the rationale for the minimal thresholds.</p><p><strong>Recent findings: </strong>The minimal diagnostic threshold for borderline TCMR has been reset to original Banff i1/t1, where isolated tubulitis is now excluded. Arteritis can be mediated by either Grade II TCMR or caused by donor specific antibody as antibody-mediated vascular rejection. The conservative threshold for chronic active TCMR diagnosis uses moderate total and scarred inflammation with tubulitis has been challenged by recent longitudinal data to suggest lower thresholds including i-IFTA=1 as clinically relevant.</p><p><strong>Summary: </strong>Minor changes in the threshold ruleset can cause substantial alterations in the final pathological diagnoses. While minimal thresholds for borderline and active TCMR have now stabilized, future changes are likely for chronic active TCMR pending confirmatory research.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"212-217"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143656394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The boundaries of normal kidney tissue for biomedical research.","authors":"Jeffrey B Hodgin, Rajasree Menon, Markus Bitzer","doi":"10.1097/MNH.0000000000001069","DOIUrl":"10.1097/MNH.0000000000001069","url":null,"abstract":"<p><strong>Purpose of review: </strong>In this review, we highlight the importance of understanding the inherent biological variability in normal kidney, or healthy reference tissue, to establish an accurate reference point for biomedical research. We explore this and the advantages and limitations of various sources of healthy reference tissue suitable for structural and omics-level studies.</p><p><strong>Recent findings: </strong>Several large consortia are employing omic technologies for diseased and normal kidney tissue, underscoring the importance of utilizing healthy reference tissue in these studies. Emerging approaches, such as artificial intelligence and multiomic analyses, are expanding our understanding of structural and molecular heterogeneity in healthy reference kidney tissue and uncovering new insights.</p><p><strong>Summary: </strong>Biological variability in healthy reference tissue at the functional, structural, and molecular level is complex and remains an active area of study. Thoughtful selection of healthy reference tissue sources is critical, providing the greatest potential for producing high-quality research outcomes.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"218-223"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11957444/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143584957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Owen P Cunneely, Anne Roberts, Sonia Fargue, John Knight, Dean G Assimos, Kyle D Wood
{"title":"Metabolic dysfunction associated steatotic liver and kidney stones: what is going on?","authors":"Owen P Cunneely, Anne Roberts, Sonia Fargue, John Knight, Dean G Assimos, Kyle D Wood","doi":"10.1097/MNH.0000000000001062","DOIUrl":"10.1097/MNH.0000000000001062","url":null,"abstract":"<p><strong>Purpose of review: </strong>Metabolic dysfunction associated steatotic liver disease (MASLD) is increasing throughout the world, affecting nearly one in three individuals. Kidney stone disease, which is also increasing, is associated with MASLD. Common risk factors for both, including obesity, diabetes, dyslipidemia, hypertension, and metabolic syndrome, are likely drivers of this association. We present here a review of the associations and possible interconnections between these two common disease processes.</p><p><strong>Recent findings: </strong>Epidemiological studies are discordant regarding the impact of sex on this association and on the impact of MASLD on incident stone risk. The nature of kidney stones is rarely taken into account.A favorable milieu for uric acid kidney stone formation may be created by a lower urine pH resulting from defective ammonium production associated with insulin resistance, common in MASLD.Endogenous oxalate synthesis, a major risk factor for calcium oxalate kidney stones, may be increased in MASLD via decline in the activity of enzymes involved in the detoxification of glyoxylate, the immediate precursor of oxalate.</p><p><strong>Summary: </strong>The nature of kidney stones associated with MASLD and factors driving this association remain to be elucidated. Potential mechanisms identified underlying this include an increase in the risk factors for both uric acid and calcium oxalate kidney stones.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"247-253"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143064252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Targeting aldosterone to improve cardiorenal outcomes: from nonsteroidal mineralocorticoid receptor antagonists to aldosterone synthase inhibitors.","authors":"Wryan Helmeczi, Gregory L Hundemer","doi":"10.1097/MNH.0000000000001067","DOIUrl":"10.1097/MNH.0000000000001067","url":null,"abstract":"<p><strong>Purpose of review: </strong>Aldosterone dysregulation plays a major role in the pathogenesis of hypertension, cardiovascular disease, and kidney disease. Traditionally, steroidal mineralocorticoid receptor (MR) antagonists, namely spironolactone and eplerenone, have been the only available options to target aldosterone. Over recent years, a host of promising novel aldosterone-targeted pharmacologic agents have been developed thereby providing new options to mitigate aldosterone-mediated cardiovascular and kidney disease.</p><p><strong>Recent findings: </strong>Recently, a number of nonsteroidal MR antagonists (finerenone, esaxerenone, and ocedurenone) and highly specific aldosterone synthase inhibitors (baxdrostat, lorundrostat, dexfadrostat, and vicadrostat) have been developed. The early clinical data for these novel medications looks promising regarding their efficacy in improving blood pressure control, preventing adverse cardiovascular outcomes, and slowing chronic kidney disease progression. Moreover, they appear to be generally safe and well tolerated.</p><p><strong>Summary: </strong>In the coming years, nonsteroidal MR antagonists and aldosterone synthase inhibitors are likely to play an increasingly large role in routine medical practice to help improve cardiovascular and kidney outcomes.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"241-246"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143514984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jia Xin Huang, Vanessa-Giselle Peschard, Elaine Ku
{"title":"Impact of intensive blood pressure control on kidney outcomes.","authors":"Jia Xin Huang, Vanessa-Giselle Peschard, Elaine Ku","doi":"10.1097/MNH.0000000000001070","DOIUrl":"10.1097/MNH.0000000000001070","url":null,"abstract":"<p><strong>Purpose of review: </strong>Hypertension has long been recognized as a modifiable risk factor for cardiovascular events. However, the role of intensive blood pressure (BP) control in preventing kidney disease progression continues to be debated. This review will provide a brief update on the evidence in support of or against the intensive control of BP on kidney outcomes in patient with chronic kidney disease (CKD), focusing particularly on trial-grade evidence.</p><p><strong>Recent findings: </strong>Recently, three large trials conducted in China compared the effects of intensive BP control in adults with cardiovascular risk factors. All three trials demonstrated that intensive BP control confers cardiovascular benefits, but mixed results were noted in terms of the risk of adverse kidney outcomes. In individual-level meta-analyses of six trials of different BP control strategies in patients with CKD, intensive BP control appeared to reduce the risk of kidney replacement therapy in those with CKD stage 4-5, but not in patients with CKD stage 3.</p><p><strong>Summary: </strong>Most guidelines continue to recommend a systolic BP target of 120-130 mmHg for patients with CKD given the cardiovascular benefits observed in trials of intensive BP control, though there are some signals of potential risks to the kidney with this BP treatment strategy.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"224-231"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11949411/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143699908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"APOL1-associated kidney disease: modulators of the genotype-phenotype relationship.","authors":"Martin R Pollak, David J Friedman","doi":"10.1097/MNH.0000000000001068","DOIUrl":"10.1097/MNH.0000000000001068","url":null,"abstract":"<p><strong>Purpose of review: </strong>Apolipoprotein-L1 (APOL1) G1 and G2 risk variants, found in people of recent west sub-Saharan African ancestry, dramatically increase the likelihood of kidney disease, yet the incomplete penetrance an diverse clinical manifestations underscore the need to understand the molecular and environmental factors that modulate APOL1-mediated toxicity.</p><p><strong>Recent findings: </strong>Recent studies confirm that risk variants exert a toxic gain-of-function effect, exacerbated by inflammatory triggers such as HIV infection and COVID-19. Epigenetic mechanisms and microRNA pathways further modulate APOL1 expression, influencing disease penetrance. Multiple models have clarified how subcellular localization, signal peptide processing, and interactions with the endoplasmic reticulum may contribute to pathogenesis. Therapeutic advances include inhibitors targeting APOL1 ion channel activity and strategies that block key inflammatory signaling pathways.</p><p><strong>Summary: </strong>These findings highlight a multifaceted disease process driven by both the intrinsic toxic potential of APOL1 variants and numerous extrinsic triggers. Understanding this complex interplay will be pivotal for risk stratification and the development of precision therapies, potentially improving outcomes for populations disproportionately affected by APOL1-associated kidney disease.</p>","PeriodicalId":10960,"journal":{"name":"Current Opinion in Nephrology and Hypertension","volume":" ","pages":"191-198"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143565957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}