Frontiers in Immunology (Dec 2021)

Long-Term Effects of Allogeneic Hematopoietic Stem Cell Transplantation on Systemic Inflammation in Sickle Cell Disease Patients

  • Júlia Teixeira Cottas de Azevedo,
  • Júlia Teixeira Cottas de Azevedo,
  • Thalita Cristina de Mello Costa,
  • Keli Cristina Lima,
  • Keli Cristina Lima,
  • Thiago Trovati Maciel,
  • Thiago Trovati Maciel,
  • Patrícia Vianna Bonini Palma,
  • Luiz Guilherme Darrigo-Júnior,
  • Luiz Guilherme Darrigo-Júnior,
  • Carlos Eduardo Setanni Grecco,
  • Ana Beatriz P. L. Stracieri,
  • Juliana Bernardes Elias,
  • Fabiano Pieroni,
  • Renato Luiz Guerino-Cunha,
  • Renato Luiz Guerino-Cunha,
  • Ana Cristina Silva Pinto,
  • Gil Cunha De Santis,
  • Dimas Tadeu Covas,
  • Dimas Tadeu Covas,
  • Olivier Hermine,
  • Olivier Hermine,
  • Belinda Pinto Simões,
  • Maria Carolina Oliveira,
  • Maria Carolina Oliveira,
  • Kelen Cristina Ribeiro Malmegrim,
  • Kelen Cristina Ribeiro Malmegrim

DOI
https://doi.org/10.3389/fimmu.2021.774442
Journal volume & issue
Vol. 12

Abstract

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Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is the only currently available curative treatment for sickle cell disease (SCD). However, the effects of HSCT on SCD pathophysiology are poorly elucidated. Here, we assessed red blood cell (RBC) adhesiveness, intensity of hemolysis, vascular tone markers and systemic inflammation, in SCD patients treated with allogeneic HSCT. Thirty-two SCD patients were evaluated before and on long-term follow-up after HSCT. Overall survival was 94% with no severe (grade III-IV) graft-vs-host disease and a 22% rejection rate (graft failure). Hematological parameters, reticulocyte counts, and levels of lactate dehydrogenase (LDH), endothelin-1 and VCAM-1 normalized in SCD patients post-HSCT. Expression of adhesion molecules on reticulocytes and RBC was lower in patients with sustained engraftment. Levels of IL-18, IL-15 and LDH were higher in patients that developed graft failure. Increased levels of plasma pro-inflammatory cytokines, mainly TNF-α, were found in SCD patients long-term after transplantation. SCD patients with sustained engraftment after allo-HSCT showed decreased reticulocyte counts and adhesiveness, diminished hemolysis, and lower levels of vascular tonus markers. Nevertheless, systemic inflammation persists for at least five years after transplantation, indicating that allo-HSCT does not equally affect all aspects of SCD pathophysiology.

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