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Updated: Oct 20, 2025

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry
Published on: November 5, 2019
Caffeic acid: an antioxidant with novel antisickling properties
Tigist Kassa1, James G Whalin2, Mark P Richards2
1Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research Food and Drug Administration (FDA), Silver Spring, MD, USA.
Caffeic acid (CA) reduces harmful oxidation in sickle cell hemoglobin (HbS) and significantly delays HbS polymerization. These antioxidant and antisickling properties suggest therapeutic potential for sickle cell disease (SCD).
Area of Science:
- Biochemistry
- Hematology
- Pharmacology
Background:
- Caffeic acid (CA) is known to inhibit oxidative reactions in myoglobin and hemoglobin, contributing to its antioxidant effects.
- Sickle cell hemoglobin (HbS) is prone to oxidation, forming persistent ferryl hemoglobin (HbFe4+), which exacerbates the disease.
Purpose of the Study:
- To investigate the effects of caffeic acid (CA) on sickle cell hemoglobin (HbS) oxidation intermediates and polymerization.
- To evaluate the potential of CA as a therapeutic agent for sickle cell disease (SCD).
Main Methods:
- Studied the impact of CA on HbS oxidation in the presence of hydrogen peroxide (H2O2) at varying concentrations.
- Assessed HbS polymerization delay using mass spectrometry to analyze CA's covalent bonding to HbS.
- Quantified HbFe4+ accumulation in response to CA treatment.
Main Results:
- CA significantly reduced HbFe4+ accumulation, with a fivefold decrease at low H2O2 concentrations.
- A 5-molar excess of CA delayed HbS polymerization by approximately 200 seconds, potentially preventing vaso-occlusion.
- Mass spectrometry revealed preferential covalent bonding of CA to the βCys93 residue of HbS.
Conclusions:
- Caffeic acid exhibits dual antioxidant and antisickling properties against HbS.
- The observed delay in HbS polymerization by CA is theoretically sufficient to prevent microvascular complications in vivo.
- CA warrants further investigation for its therapeutic potential in managing sickle cell disease.
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