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Torque teno virus (TTV) plasma DNA load has been consistently shown to be a surrogate biomarker of immunosuppression in solid organ transplant recipients. It is uncertain whether it may behave similarly in allogeneic hematopoietic stem cell transplant recipients (allo-HSCT). Here, we characterized the dynamics of TTV DNAemia in patients undergoing T-cell replete allo-SCT at late times after transplantation (> day + 100). This retrospective single-center observational study included 33 allo-HSCT patients. Plasma TTV DNA loads were quantified by real-time PCR before initiating the conditioning regimen and at different time points after transplant. Absolute lymphocyte counts (ALC) were measured by flow cytometry. Overall, TTV DNA load increased steadily after engraftment, reaching a peak by day + 90; afterwards, it remained relatively constant until day + 210. TTV DNA loads measured within days + 120 and + 210 correlated inversely with paired ALC, while both parameters did correlate directly within days + 20 and + 60. The median TTV DNA area under a curve between days + 90 and + 210 [(AUC)] was significantly higher in patients who received corticosteroids within this time frame for treatment of graft versus host disease (either acute, chronic or both) than in controls (P = 0.025). In summary, TTV DNA load may mirror the degree of immunosuppression at late times after allo-HSCT.
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http://dx.doi.org/10.1007/s00430-019-00586-w | DOI Listing |
J Clin Virol
December 2024
Department of Microbiology and Infection Prevention, University of Groningen. University Medical Center Groningen, Groningen, The Netherlands.
J Med Virol
November 2024
Department of Medicine III, Division of Nephrology and Dialysis, Medical University of Vienna, Vienna, Austria.
Torque Teno virus (TTV) load is linked with the functionality of its host's immune system and has been proposed as a potential monitoring tool for immune-modulating therapy. However, the immunological mechanisms of TTV control are incompletely understood. To assess the effect of the classical complement pathway on TTV, 64 healthy volunteers and 10 kidney transplant recipients treated with the anti-C1s antibody sutimlimab were analyzed for serum TTV copy numbers (c/mL) by qPCR.
View Article and Find Full Text PDFInt J Mol Sci
October 2024
Department of Immunopathology of Infectious and Parasitic Diseases, Medical University of Warsaw, Pawinskiego 3c, 02-106 Warsaw, Poland.
virus (TTV) is a ssDNA orphan virus belonging to the family, but some recent studies suggested its possible involvement in central nervous system (CNS) pathology. We analyzed serum and cerebrospinal fluid samples (CSF) from 109 patients with encephalitis for TTV infection using serological and molecular testing, virus quantitative measurement, and next-generation sequencing-based (NGS) phylogenetic analysis. TTV noncoding region (UTR) and/or open reading frame 1 (ORF-1) sequences were detected in serum of 86 (79%) patients and in nine (8%) patients in CSF.
View Article and Find Full Text PDFJ Gerontol A Biol Sci Med Sci
November 2024
Advanced Technology Center for Aging Research, IRCCS INRCA, Ancona, Italy.
BMC Pulm Med
October 2024
Faculty of Medicine, Department of Pneumology Medical Center, University of Freiburg, Freiburg, Germany.
Background: Lung transplantation (LTx) remains the only efficient treatment for selected patients with end-stage pulmonary disease. The age limit for the acceptance of donor organs in LTx is still a matter of debate. We here analyze the impact of donor organ age and the underlying pulmonary disease on short- and long-term outcome and survival after LTx.
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