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The oxygen affinity of haemoglobin Hammersmith
British Journal of Haematology
|June 1, 1975
Summary
Hemoglobin Hammersmith significantly reduces red blood cell oxygen affinity due to intrinsic low affinity and abnormal Bohr effect. This impacts oxygen delivery in patients with this hemoglobin variant.
Area of Science:
- Hematology
- Biochemistry
- Molecular Biology
Background:
- Hemoglobinopathies represent a significant global health burden.
- Understanding the functional consequences of specific hemoglobin variants is crucial for diagnosis and management.
Observation:
- Oxygen dissociation studies were performed on red blood cells and lysates from a patient with Hemoglobin Hammersmith (Hb Hammersmith).
- Cellular oxygen affinity was decreased, influenced by elevated 2,3-diphosphoglycerate (2,3-DPG) and the intrinsic properties of Hb Hammersmith.
- Abnormal Bohr effect and reduced haem-haem interactions were observed in the patient's red cells.
Findings:
- Lysate studies revealed low oxygen affinity, a normal Bohr effect at 50% saturation, and slightly decreased haem-haem interactions.
- Quantification indicated 30-33% Hb Hammersmith in the patient's cells.
- Calculated oxygen dissociation curves for isolated Hb Hammersmith showed greatly reduced oxygen affinity and normal Bohr effect and 2,3-DPG interaction.
Implications:
- Hb Hammersmith significantly impairs oxygen transport, leading to reduced oxygen affinity.
- The findings highlight the complex interplay of factors affecting hemoglobin function in vivo.
- Further research into Hb Hammersmith pathophysiology can inform clinical management strategies.