Adaptive Immune Remodeling in Sickle Cell Disease: Linking Hemolysis-Driven Inflammation to Immune Dysfunction.

Sickle cell disease (SCD) is increasingly acknowledged not only as a hemoglobinopathy but also as a disorder of immune remodeling driven by persistent hemolysis and chronic inflammation. In this perspective review, we propose a mechanistic scaffold in which hemolysis-associated damage-associated molecular patterns (DAMPs) initiate sustained innate immune activation that reshapes bone marrow niche, i.e., alter hematopoietic stem and progenitor cell fate, alters lymphopoiesis, and progressively remodels adaptive immunity. We discuss emerging evidence linking chronic inflammatory signaling to T-cell activation, altered helper T-cell polarization, impaired germinal center dynamics, and depletion of memory B-cell compartments. We further highlight age-dependent immune remodeling across pediatric and adult SCD populations and discuss how these alterations may contribute to impaired vaccine response, increased susceptibility to infection, and transfusion-related alloimmunization. By integrating insights from hematopoiesis, inflammation, and adaptive immunity, this perspective reframes SCD-associated hemolysis and immune dysfunction as a central component of disease pathophysiology and identifies potential directions for future immunomodulatory and vaccine-focused therapeutic strategies.