Study identifies hemoglobin C oxidative damage as key driver of HbSC sickle cell disease severity
Researchers found that hemoglobin C is highly prone to oxidative denaturation in HbSC sickle cell disease, causing red blood cell membrane damage and reduced flexibility more severely than in other sickle cell variants. The study used mouse models and patient samples to show that HbC's oxidative damage contributes substantially to disease pathophysiology, independent of sickling potential. These findings suggest that targeting oxidative membrane injury—rather than only sickling—could improve treatment outcomes for HbSC patients.
A preprint study published on bioRxiv demonstrates that hemoglobin C undergoes oxidative denaturation at higher rates than hemoglobin S, leading to formation of Heinz bodies (denatured hemoglobin aggregates) and reduced red blood cell deformability in HbSC sickle cell disease. Using HbCC and HbSC transgenic mice alongside patient samples, researchers found that oxidative damage followed the pattern HbCC > HbSC > HbSS, despite HbSS cells producing higher reactive oxygen species overall. Notably, hydroxyurea treatment and the antioxidant quercetin both reduced Heinz-body formation and improved red blood cell flexibility in HbSC patient samples, with quercetin showing benefits without inducing fetal hemoglobin—suggesting the mechanism involves direct antioxidant protection rather than hemoglobin switching. These results indicate that HbC-driven oxidative membrane injury represents a distinct pathological mechanism in HbSC disease that could be therapeutically targeted independently of antisickling approaches.
Limitations & open questions
The study does not discuss potential clinical trial timelines for antioxidant-based therapies, comparative efficacy data against existing HbSC treatments beyond hydroxyurea, or whether findings translate to other hemoglobinopathies. The authors note that quercetin's bioavailability and in vivo efficacy remain to be determined.
What different sources said
- bioRxivCenter
Hemoglobin C is prone to oxidative denaturation, resulting in red blood cell membrane damage in HbSC disease
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