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Enhanced Costimulation Blockade With αCD154, αCD2, and αCD28 to Promote Heart Allograft Tolerance in Nonhuman Primates.
Transplantation
January 2025
Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
Background: Long-term renal allograft acceptance has been achieved in macaques using a transient mixed hematopoetic chimerism protocol, but similar regimens have proven unsuccessful in heart allograft recipients unless a kidney transplant was performed simultaneously. Here, we test whether a modified protocol based on targeting CD154, CD2, and CD28 is sufficient to prolong heart allograft acceptance or promote the expansion of regulatory T cells.
Methods: Eight macaques underwent heterotopic allo-heart transplantation from major histocompatibility complex-mismatched donors.
Options for pediatric heart valve replacement.
Future Cardiol
January 2025
Department of Cardiovascular Surgery, Arkansas Children's Hospital, Little Rock, AR, USA.
Heart valve replacement is indicated for children with irreparable heart valve disease. These replacements come in a variety of forms including mechanical, xenograft tissue, allograft tissue, and autograft tissue valves. These options each have unique benefits and risks profiles.
View Article and Find Full Text PDFFate of Semilunar Valves From Discarded Hearts at the Time of Pediatric Heart Retransplantation.
Pediatr Transplant
February 2025
The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
Background: Partial heart transplantation (PHT) is a novel procedure for children in need of a growing valve replacement option. One challenge is identifying suitable donor valves. Semilunar heart valves from patients receiving a retransplant may be a source, however their functionality and growth potential especially at the time of retransplant are unknown.
View Article and Find Full Text PDFGut Microbial Dysbiosis and Implications in Solid Organ Transplantation.
Biomedicines
December 2024
Department of Surgery, Duke University, Durham, NC 27710, USA.
The gut microbiome has been shown to play a significant role in solid organ transplantation, potentially influencing graft function and patient outcomes. Dysbiosis, characterized by reduced microbial diversity and an increase in pathogenic taxa, has been linked to higher incidences of allograft rejection, graft dysfunction, and post-transplant mortality. Several studies suggest that the gut microbiome might be able to serve as both a biomarker and a therapeutic target, potentially guiding personalized immunosuppressive therapies and other interventions to improve outcomes after solid organ transplantation.
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