Eliseo Albert1, Carlos Solano2, Tania Pascual1, Ignacio Torres1, Lisa Macera3, Daniele Focosi4, Fabrizio Maggi3, Estela Giménez1, Paula Amat5, David Navarro6. 1. Microbiology Service, Hospital Clínico Universitario, Institute for Research INCLIVA, Valencia, Spain. 2. Hematology Service, Hospital Clínico Universitario, Institute for Research INCLIVA, Valencia, Spain; Department of Medicine, School of Medicine, University of Valencia, Valencia, Spain. 3. Virology Unit, Pisa University Hospital, Pisa, Italy. 4. North-Western Tuscany Blood Bank, Pisa University Hospital, Pisa, Italy. 5. Hematology Service, Hospital Clínico Universitario, Institute for Research INCLIVA, Valencia, Spain. 6. Microbiology Service, Hospital Clínico Universitario, Institute for Research INCLIVA, Valencia, Spain; Department of Microbiology, School of Medicine, University of Valencia, Valencia, Spain. Electronic address: david.navarro@uv.es.
Abstract
BACKGROUND: Torque Teno virus (TTV) plasma DNA load directly correlate with the level of immunosuppresion in different clinical settings. It is uncertain whether this may be the case in allogeneic hematopoietic stem cell transplant recipients (allo-HSCT). OBJECTIVES: We characterized the dynamics of TTV DNAemia in patients undergoing T-cell replete allo-SCT. STUDY DESIGN: Retrospective single-center observational study including 72 allo-HSCT patients. Plasma TTV DNA loads were quantified before initiating the conditioning regimen and at different time-points after transplant by real-time PCR. White blood cells (WBC) and absolute lymphocyte counts (ALC) were measured by flow cytometry. RESULTS: A dramatic drop in plasma TTV DNA load was observed shortly after conditioning. The TTV DNA load increased steadily after engraftment reaching its peak at day +90 after transplant. The increase in TTV DNA load paralleled that of ALC, and was of greater magnitude in patients who developed severe (grades II-IV) acute graft vs. host disease. CONCLUSION: Repopulation of lymphocytes early after allo-HSCT correlates with an increase of plasma TTV DNA load. Prospective studies are nevertheless needed to determine whether the kinetics of TTV DNAemia may allow inference of the degree of overall immunocompetence in these patients.
BACKGROUND:Torque Teno virus (TTV) plasma DNA load directly correlate with the level of immunosuppresion in different clinical settings. It is uncertain whether this may be the case in allogeneic hematopoietic stem cell transplant recipients (allo-HSCT). OBJECTIVES: We characterized the dynamics of TTV DNAemia in patients undergoing T-cell replete allo-SCT. STUDY DESIGN: Retrospective single-center observational study including 72 allo-HSCT patients. Plasma TTV DNA loads were quantified before initiating the conditioning regimen and at different time-points after transplant by real-time PCR. White blood cells (WBC) and absolute lymphocyte counts (ALC) were measured by flow cytometry. RESULTS: A dramatic drop in plasma TTV DNA load was observed shortly after conditioning. The TTV DNA load increased steadily after engraftment reaching its peak at day +90 after transplant. The increase in TTV DNA load paralleled that of ALC, and was of greater magnitude in patients who developed severe (grades II-IV) acute graft vs. host disease. CONCLUSION: Repopulation of lymphocytes early after allo-HSCT correlates with an increase of plasma TTV DNA load. Prospective studies are nevertheless needed to determine whether the kinetics of TTV DNAemia may allow inference of the degree of overall immunocompetence in these patients.
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