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https://www.readbyqxmd.com/read/29774593/bk-viremia-is-not-associated-with-adverse-outcomes-in-the-absence-of-bk-nephropathy
#1
Amber L Hertz-Tang, Brad C Astor, Didier A Mandelbrot, Maha A Mohamed, Arjang Djamali, Sandesh Parajuli
There are limited data regarding the association of different levels of BK viremia and BK nephropathy (BKN), and graft outcomes. We studied the BK plasma PCR levels of all kidney transplant recipients (KTR) transplanted at our institution between 01/01/2006 and 06/30/2014. Patients were divided into groups based on their highest BK plasma PCR level within the first year following transplantation: undetectable, low (<1000 copies/ml), moderate (1000-10,000 copies/ml), high (>10,000-100,000 copies/ml), very high (>100,000copies/ml), and those that had biopsy-proven BKN...
May 17, 2018: Clinical Transplantation
https://www.readbyqxmd.com/read/29766776/bk-polyomavirus-immune-response-with-stress-on-bk-specific-t-cells
#2
Hany M El Hennawy
Polyomavirus-associated nephropathy is a pertinent cause of poor renal allograft survival. Absence of defensive immunity toward BK polyomavirus may favor the occurrence of BK polyomavirus-active infection and influence the progression to polyomavirus-associated nephropathy. Humoral immune responses may offer incomplete protection. In this review, available data on both humoral and cellular immunity were examined, with a concentration on BK polyomavirus-specific T cells; in addition, their roles in BK polyomavirus cellular immune response and immunotherapy were discussed...
May 16, 2018: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/29765170/bk-virus-induced-renal-allograft-nephropathy
#3
Karel Krejci, Tomas Tichy, Jana Bednarikova, Kamil Zamboch, Josef Zadrazil
BK virus nephropathy (BKVN) is a serious opportunistic infection threatening renal function especially during the first year after transplantation. Its incidence is now on the rise and is closely related to the level of the recipient's immune system inhibition. This is more intensive with current trends in transplantation medicine, where more potent immunosuppressive protocols are used and more aggressive antirejection therapy is applied. In the absence of BK virus (BKV) specific therapy and limited treatment options for advanced BKVN, active screening of BKV replication and subsequent preemptive adjustment of immunosuppression are essential measures to prevent BKVN...
May 16, 2018: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/29748530/bk-virus-a-cause-for-concern-in-thoracic-transplantation
#4
Markus J Barten, Andreas Zuckermann
Human BK polyomavirus (BKV) infection is poorly documented in heart and lung transplant patients. BK viruria and viremia have been estimated to affect 19% and 5% of heart transplant recipients, respectively. Data are limited, especially for lung transplantation, but the proportion of patients progressing from BK viruria to viremia or BKV-related nephropathy (BKVN) appears lower than in kidney transplantation. Nevertheless, a number of cases of BKVN have been reported in heart and lung transplant patients, typically with late diagnosis and generally poor outcomes...
May 11, 2018: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/29746834/characterization-of-bk-polyomaviruses-from-kidney-transplant-recipients-suggests-a-role-for-apobec3-in-driving-in-host-virus-evolution
#5
Alberto Peretti, Eileen M Geoghegan, Diana V Pastrana, Sigrun Smola, Pascal Feld, Marlies Sauter, Stefan Lohse, Mayur Ramesh, Efrem S Lim, David Wang, Cinzia Borgogna, Peter C FitzGerald, Valery Bliskovsky, Gabriel J Starrett, Emily K Law, Reuben S Harris, J Keith Killian, Jack Zhu, Marbin Pineda, Paul S Meltzer, Renzo Boldorini, Marisa Gariglio, Christopher B Buck
BK polyomavirus (BKV) frequently causes nephropathy (BKVN) in kidney transplant recipients (KTRs). BKV has also been implicated in the etiology of bladder and kidney cancers. We characterized BKV variants from two KTRs who developed BKVN followed by renal carcinoma. Both patients showed a swarm of BKV sequence variants encoding non-silent mutations in surface loops of the viral major capsid protein. The temporal appearance and disappearance of these mutations highlights the intra-patient evolution of BKV. Some of the observed mutations conferred resistance to antibody-mediated neutralization...
May 9, 2018: Cell Host & Microbe
https://www.readbyqxmd.com/read/29746472/differential-t-cell-response-against-bk-virus-regulatory-and-structural-antigens-a-viral-dynamics-modelling-approach
#6
Arturo Blazquez-Navarro, Thomas Schachtner, Ulrik Stervbo, Anett Sefrin, Maik Stein, Timm H Westhoff, Petra Reinke, Edda Klipp, Nina Babel, Avidan U Neumann, Michal Or-Guil
BK virus (BKV) associated nephropathy affects 1-10% of kidney transplant recipients, leading to graft failure in about 50% of cases. Immune responses against different BKV antigens have been shown to have a prognostic value for disease development. Data currently suggest that the structural antigens and regulatory antigens of BKV might each trigger a different mode of action of the immune response. To study the influence of different modes of action of the cellular immune response on BKV clearance dynamics, we have analysed the kinetics of BKV plasma load and anti-BKV T cell response (Elispot) in six patients with BKV associated nephropathy using ODE modelling...
May 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29738028/quantitative-detection-of-bk-virus-in-kidney-transplant-recipients-a-prospective-validation-study
#7
Gabriel Godinho Pinto, José Antonio Tesser Poloni, Diego D'Avila Paskulin, Fabio Spuldaro, Fernanda de Paris, Afonso Luís Barth, Roberto Ceratti Manfro, Elizete Keitel, Alessandro C Pasqualotto
INTRODUCTION: BK virus (BKV) infection in renal transplant patients may cause kidney allograft dysfunction and graft loss. Accurate determination of BKV viral load is critical to prevent BKV-associated nephropathy (BKVAN) but the cut-off that best predicts BKVAN remains controversial. OBJECTIVE: To evaluate the performance of a commercial and an in-house qPCR test for quantitative detection of BK virus in kidney transplant recipients. METHODS: This was a prospective study with kidney transplant recipients from two large university hospitals in Brazil...
April 19, 2018: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/29731924/the-spectrum-of-histopathological-changes-in-the-renal-allograft-a-12-months-protocol-biopsy-study
#8
Galina Severova-Andreevska, Ladislava Grcevska, Gordana Petrushevska, Koco Cakalaroski, Aleksandar Sikole, Olivera Stojceva-Taneva, Ilina Danilovska, Ninoslav Ivanovski
INTRODUCTION: Renal transplantation became a routine and successful medical treatment for Chronic Kidney Disease in the last 30 years all over the world. Introduction of Luminex based Single Antigen Beads (SAB) and recent BANFF consensus of histopathological phenotypes of different forms of rejection enables more precise diagnosis and changes the therapeutic approach. The graft biopsies, protocol or cause, indicated, remain a golden diagnostic tool for clinical follow up of kidney transplant recipients (KTR)...
April 15, 2018: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29731069/bk-virus-infection-in-thai-kidney-transplant-recipients-a-single-center-experience
#9
P Skulratanasak, J Mahamongkhonsawata, M Chayakulkeereeb, N Larpparisutha, N Premasathiana, A Vongwiwatana
INTRODUCTION: BK virus-associated nephropathy (BKVAN) is a significant cause of allograft dysfunction and failure in kidney transplant recipients. Early detection and proper adjustment of immunosuppression is the best method for treatment of this condition and to improve long-term allograft outcome. Here, we reported the prevalence and risk factors of BK virus (BKV) infection in our population. METHODS: We retrospectively reviewed kidney transplant recipients at Siriraj Hospital between January 2012 and December 2015 who had been investigated using real-time polymerase chain reaction BK viral load...
May 2018: Transplantation Proceedings
https://www.readbyqxmd.com/read/29725592/urinary-virome-perturbations-in-kidney-transplantation
#10
Tara K Sigdel, Neil Mercer, Sharvin Nandoe, Carrie D Nicora, Kristin Burnum-Johnson, Wei-Jun Qian, Minnie M Sarwal
The human microbiome is important for health and plays a role in essential metabolic functions and protection from certain pathogens. Conversely, dysbiosis of the microbiome is seen in the context of various diseases. Recent studies have highlighted that a complex microbial community containing hundreds of bacteria colonizes the healthy urinary tract, but little is known about the human urinary viruses in health and disease. To evaluate the human urinary virome in the context of kidney transplantation (tx), variations in the composition of the urinary virome were evaluated in urine samples from normal healthy volunteers as well as patients with kidney disease after they had undergone kidney tx...
2018: Frontiers in Medicine
https://www.readbyqxmd.com/read/29706532/the-structure-of-an-infectious-human-polyomavirus-and-its-interactions-with-cellular-receptors
#11
Daniel L Hurdiss, Martin Frank, Joseph S Snowden, Andrew Macdonald, Neil A Ranson
BK polyomavirus (BKV) causes polyomavirus-associated nephropathy and hemorrhagic cystitis in immunosuppressed patients. These are diseases for which we currently have limited treatment options, but potential therapies could include pre-transplant vaccination with a multivalent BKV vaccine or therapeutics which inhibit capsid assembly or block attachment and entry into target cells. A useful tool in such efforts would be a high-resolution structure of the infectious BKV virion and how this interacts with its full repertoire of cellular receptors...
April 21, 2018: Structure
https://www.readbyqxmd.com/read/29688849/cryptococcoma-of-a-transplanted-kidney-in-a-patient-presenting-with-recurrent-urinary-tract-infection-a-case-report
#12
Albert Z Muranda, Ludolf Greeff, Mike M Sathekge, Thabo Lengano, Victor O L Karusseit
BACKGROUND: Cryptococcosis is an important opportunistic infection of organ transplant recipients. It is the third most common fungal infection of transplant patients and occurs especially in kidney recipients. Cryptococcus neoformans is a ubiquitous fungus which infects humans by inhalation of spores. C. gattii has more recently been recognised as a pathogen. Infection commonly is disseminated affecting mainly the central nervous system and the lungs. Cryptococcoma, a localised form of the disease, has been described in various organs...
April 23, 2018: BMC Nephrology
https://www.readbyqxmd.com/read/29619905/etiological-analysis-of-graft-dysfunction-following-living-kidney-transplantation-a-report-of-366-biopsies
#13
Jin Zhang, Jiang Qiu, Guo-Dong Chen, Chang-Xi Wang, Chang Wang, Shuang-Jin Yu, Li-Zhong Chen
AIM: The aim of this study is to investigate the clinical features of graft dysfunction following living kidney transplantation and to assess its causes. METHODS: We retrospectively analyzed a series of 366 living kidney transplantation indication biopsies with a clear etiology and diagnosis from July 2003 to June 2016 at our center. The classifications and diagnoses were performed based on clinical and pathological characteristics. All biopsies were evaluated according to the Banff 2007 schema...
November 2018: Renal Failure
https://www.readbyqxmd.com/read/29606262/-identifying-the-specific-causes-of-kidney-allograft-loss-a-population-based-study
#14
Charlotte Lohéac, Olivier Aubert, Alexandre Loupy, Christophe Legendre
INTRODUCTION: Results of kidney transplantation have been improving but long-term allograft survival remains disappointing. The objective of the present study was to identify the specific causes of renal allograft loss, to assess their incidence and long-term outcomes. METHODS: A total of 4783 patients from four French centres, transplanted between January 2004 and January 2014 were prospectively included. A total of 9959 kidney biopsies (protocol and for cause) performed between January 2004 and March 2015 were included...
April 2018: Néphrologie & Thérapeutique
https://www.readbyqxmd.com/read/29599935/bk-virus-associated-collecting-duct-carcinoma-of-the-renal-allograft-in-a-kidney-pancreas-allograft-recipient
#15
Myriam Dao, Adrien Pécriaux, Thomas Bessede, Antoine Dürrbach, Charlotte Mussini, Catherine Guettier, Sophie Ferlicot
BK polyomavirus (BKV) nephropathy is a major concern in renal transplantation. Its main consequence is graft loss, which occurs in more than 50% of the cases. De novo renal cell carcinoma in renal allograft is a very rare event. Most of these tumors are papillary or clear cell carcinomas. We report herein the first case of collecting duct carcinoma of the renal allograft in a kidney-pancreas allograft adult recipient. Collecting duct carcinoma occurs long after the cure of a BKV nephropathy. At this time, BKV viremia and viruria were negative as well as the immunostaining for SV40 in the non-tumor kidney...
March 13, 2018: Oncotarget
https://www.readbyqxmd.com/read/29579827/epidemiologic-study-and-genotyping-of-bk-virus-in-renal-transplant-recipients
#16
M Cobos, L Aquilia, E Garay, S Ochiuzzi, S Alvarez, D Flores, C Raimondi
BK virus (BKV) infection occurs during childhood and remains latent in the urinary tract. The virus is reactivated in immunosuppressed patients, particularly in those with cellular immunity deficiency, allowing its detection in urine and blood. Nephropathy caused by the virus in renal transplantation recipients may lead to graft failure. The purpose of this study is to know the prevalence of BKV variables in renal transplantation recipients and to evaluate their clinical evolution through molecular methods of "in house" development...
March 2018: Transplantation Proceedings
https://www.readbyqxmd.com/read/29567951/identification-of-potential-key-protein-interaction-networks-of-bk-virus-nephropathy-in-patients-receiving-kidney-transplantation
#17
Linpei Jia, Wenjing Fu, Rufu Jia, Leiyun Wu, Xiaoxia Li, Qiang Jia, Hongliang Zhang
We aim to identify the key protein interaction networks and implicated pathways of BK virus nephropathy (BKVN) via bioinformatic methods. The microarray data GSE75693 of 30 patients with stable kidney transplantation and 15 with BKVN were downloaded and analyzed by using the limma package to identify differentially expressed genes (DEGs). Then the gene ontology (GO) functional enrichment analysis and the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis were done to investigate the molecular function (MF), biological process (BP), cellular components (CC) and pathways of DEGs...
March 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29518695/bk-polyomavirus-microrna-expression-and-sequence-variation-in-polyomavirus-associated-nephropathy
#18
Elina Virtanen, Hanna Seppälä, Ilkka Helanterä, Pia Laine, Irmeli Lautenschlager, Lars Paulin, Laura Mannonen, Petri Auvinen, Eeva Auvinen
BACKGROUND: BK polyomavirus (BKPyV) infection is a common asymptomatic viral infection in the general population. Severe complications are seen in immunocompromised individuals, such as polyomavirus-associated nephropathy (PyVAN) in renal transplant recipients. Information on BKPyV microRNA expressions is scarce, although polyomavirus-encoded microRNAs have been shown to control viral replication and assist in immune evasion. Whereas the pathogenic role of rearrangements in JC polyomavirus has been well established, little is known about BKPyV rearrangements in PyVAN...
May 2018: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/29464201/prediction-of-early-bk-virus-infection-in-kidney-transplant-recipients-by-the-number-of-cells-with-intranuclear-inclusion-bodies-decoy-cells
#19
Yoshiteru Yamada, Tomohiro Tsuchiya, Isao Inagaki, Mitsuru Seishima, Takashi Deguchi
Background: BK virus (BKV) is the cause of nephropathy. Because BKV nephropathy can progress to graft loss, early diagnosis of BKV infection is very important. In this study, we aimed to investigate the utility of quantifying cells with intranuclear inclusion bodies (decoy cells) in urinary sediment for the screening and monitoring of BKV infection in renal transplant recipients at our hospital. Methods: This was a retrospective single-center study. Urine sediment examination was performed at each outpatient visit, and the number of decoy cells was measured in the whole microscopic field...
February 2018: Transplantation Direct
https://www.readbyqxmd.com/read/29464200/polyomavirus-bk-nephropathy-associated-transcriptomic-signatures-a-critical-reevaluation
#20
Ling Pan, Zili Lyu, Benjamin Adam, Gang Zeng, Zijie Wang, Yuchen Huang, Zahidur Abedin, Parmjeet Randhawa
Background: Recent work using DNA microarrays has suggested that genes related to DNA replication, RNA polymerase assembly, and pathogen recognition receptors can serve as surrogate tissue biomarkers for polyomavirus BK nephropathy (BKPyVN). Methods: We have examined this premise by looking for differential regulation of these genes using a different technology platform (RNA-seq) and an independent set 25 biopsies covering a wide spectrum of diagnoses. Results: RNA-seq could discriminate T cell-mediated rejection from other common lesions seen in formalin fixed biopsy material...
February 2018: Transplantation Direct
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