scholarly journals Proteome‐wide analysis of T‐cell response to BK polyomavirus in healthy virus carriers and kidney transplant recipients reveals a unique transcriptional and functional profile

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
George R Ambalathingal ◽  
Ross S Francis ◽  
Dillon Corvino ◽  
Sriganesh Srihari ◽  
Blake T Aftab ◽  
...  
Keyword(s):  
T Cell ◽  
Kidney Transplant ◽  
Cell Response ◽  
T Cell Response ◽  
Transplant Recipients ◽  
Kidney Transplant Recipients ◽  
Functional Profile ◽  
Bk Polyomavirus

scholarly journals Comparing Humoral and Cellular Adaptive Immunity during Convalescent Phase of COVID-19 in Hemodialysis Patients and Kidney Transplant Recipients

2021 ◽  
Vol 10 (21) ◽  
pp. 4833
Author(s):  
Dorota Kamińska ◽  
Hanna Augustyniak-Bartosik ◽  
Katarzyna Kościelska-Kasprzak ◽  
Marcelina Żabińska ◽  
Dorota Bartoszek ◽  
...  
Keyword(s):  
Immune Response ◽  
T Cell ◽  
Kidney Transplant ◽  
Adaptive Immunity ◽  
Cell Response ◽  
Cellular Response ◽  
T Cell Response ◽  
Interferon Gamma Release Assay ◽  
Transplant Recipients ◽  
Kidney Transplant Recipients

Background. It is still unclear whether COVID-19 convalescent kidney transplant recipients (KTR) and hemodialysis (HD) patients can develop anti-SARS-CoV-2 adaptive immunity. The aim was to characterize and compare the immune response to the virus in HD patients and KTR. Methods. The study included 26 HD patients and 54 KTR—both convalescent (14 HD, 25 KTR) and unexposed. The immune response was assessed by determining the anti-SARS-CoV-2 antibodies in serum and specific T cell response via the interferon-gamma release assay (IGRA). Moreover, blood-morphology-derived parameters, immune cell phenotypes, and acute phase reactants were evaluated. Results. KRT and HD convalescents presented similar serum levels of anti-SARS-CoV-2 IgG and IgA. A negative correlation occurred between IgG and time after the infection was observed. There was a strong relationship between the prevalence of anti-SARS-CoV-2 cellular and humoral responses in both groups. Convalescent IGRA response was significantly higher in HD patients compared to KTR. Conclusions. HD patients and KTR develop humoral and cellular responses after COVID-19. The antibodies levels are similar in both groups of patients. SARS-CoV-2-reactive T cell response is stronger in HD patients compared to KTR. The SARS-CoV-2-specific IgG level decreases with time while IgA and a cellular response are maintained. IGRA proved to be a valuable test for the assessment of specific cellular immunity in immunocompromised HD patients and KTR.

scholarly journals Antibody and T Cell Response to SARS-CoV-2 Messenger RNA BNT162b2 Vaccine in Kidney Transplant Recipients and Hemodialysis Patients

2021 ◽  
pp. ASN.2021040480
Author(s):  
Dominique Bertrand ◽  
Mouad Hamzaoui ◽  
Veronique Lemée ◽  
Julie Lamulle ◽  
Melanie Hanoy ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Kidney Transplant ◽  
Cell Response ◽  
Cellular Response ◽  
Hemodialysis Patients ◽  
T Cell Response ◽  
High Rate ◽  
Transplant Recipients ◽  
Kidney Transplant Recipients

Background. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is associated with a high rate of mortality in patients with end stage renal disease and vaccination is hoped to prevent infection. Methods. Between January 18, and February 24, 2021, 225 kidney transplant recipients (KTR) and 45 hemodialysis patients (HDP) received two injections of mRNA BNT162b2 vaccine. The post-vaccinal humoral and cellular response was explored in the first 45 KTR and 10 HDP. Results. After the second dose, 8 HDP (88.9%) and 8 KTR (17.8%) developed anti-spike SARS-CoV-2 antibodies (p<0.0001). Median titer of antibodies in responders was 1052 AU/mL (IQR: 515-2689) in HDP and 671 AU/mL (IQR: 172-1523) in KTR (p=0.4). Nine HDP (100%) and 26 KTR (57.8%) showed a specific T cell response (p=0.06) after the second injection. In responders, median numbers of spike-reactive T cells were 305 SFC/106 CD3+ T cells (IQR: 95-947) in HDP and 212 SFC/106 CD3+ T cells (IQR: 61-330) in KTR (p=0.4). In KTR, the immune response to BNT162b2 seemed influenced by the immunosuppressive regimen, particularly tacrolimus or belatacept. Conclusion. Immunization with BNT162b2 seems more efficient in HDP, indicating that vaccination should be highly recommended in these patients awaiting a transplant. However, the current vaccinal strategy for KTR may not provide effective protection against COVID-19 and will likely need to be improved.

scholarly journals Antibody and T cell response to a third dose of SARS-CoV-2 messenger RNA BNT162b2 vaccine in kidney transplant recipients.

2021 ◽  
Author(s):  
Dominique Bertrand ◽  
Mouad Hamzaoui ◽  
Veronique Lemée ◽  
Julie Lamulle ◽  
Charlotte Laurent ◽  
...  
Keyword(s):  
T Cell ◽  
Kidney Transplant ◽  
Cell Response ◽  
Messenger Rna ◽  
T Cell Response ◽  
Transplant Recipients ◽  
Kidney Transplant Recipients

scholarly journals BK Polyomavirus Micro-RNAs: Time Course and Clinical Relevance in Kidney Transplant Recipients

Viruses ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 351
Author(s):  
Baptiste Demey ◽  
Véronique Descamps ◽  
Claire Presne ◽  
Francois Helle ◽  
Catherine Francois ◽  
...  
Keyword(s):  
Viral Replication ◽  
Kidney Transplant ◽  
Clinical Relevance ◽  
Graft Loss ◽  
First Year ◽  
Transplant Recipients ◽  
Kidney Transplant Recipients ◽  
Post Transplantation ◽  
Bk Polyomavirus ◽  
Micro Rnas

Background: Kidney transplant recipients (KTRs) are exposed to a high risk of BK polyomavirus (BKPyV) replication, which in turn may lead to graft loss. Although the microRNAs (miRNAs) bkv-miR-B1-3p and bkv-miR-B1-5p are produced during the viral cycle, their putative value as markers of viral replication has yet to be established. In KTRs, the clinical relevance of the changes over time in BKPyV miRNA levels has not been determined. Methods: In a retrospective study, we analyzed 186 urine samples and 120 plasma samples collected from 67 KTRs during the first year post-transplantation. Using a reproducible, standardized, quantitative RT-PCR assay, we measured the levels of bkv-miR-B1-3p and bkv-miR-B1-5p (relative to the BKPyV DNA load). Results: Detection of the two miRNAs had low diagnostic value for identifying patients with DNAemia or for predicting DNAuria during follow-up. Seven of the 14 KTRs with a sustained BKPyV infection within the first year post-transplantation showed a progressive reduction in the DNA load and then a rapid disappearance of the miRNAs. DNA and miRNA loads were stable in the other seven KTRs. Conclusions: After the DNA-based diagnosis of BKPyV infection in KTRs, bkv-miR-B1-3p and bkv-miR-B1-5p levels in the urine might be valuable markers for viral replication monitoring and thus might help physicians to avoid an excessive reduction in the immunosuppressive regimen.

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