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Methemoglobin formation and reduction in relation to hemoglobin oxygen affinity
Experientia
|January 15, 1981
Summary
High oxygen affinity hemoglobins (Hb LR) may be more prone to methemoglobin formation in vivo. This occurs when the hemoglobin is partly deoxygenated, despite in vitro stability against nitrites.
Area of Science:
- Biochemistry
- Hematology
- Molecular Biology
Background:
- High oxygen affinity hemoglobins (Hb LR) exhibit a stabilized R quaternary conformation.
- Understanding the in vivo behavior of Hb variants is crucial for diagnosing and managing related conditions.
Purpose of the Study:
- To investigate the susceptibility of Hb LR to methemoglobin formation in vitro and in vivo.
- To elucidate the mechanisms underlying potential differences in oxidation and reduction rates.
Main Methods:
- In vitro studies assessing the effect of nitrites on Hb LR.
- In vivo simulations or analyses considering partially deoxygenated hemoglobin conditions.
Main Results:
- Hb LR is not more susceptible to nitrites in vitro.
- In vivo, under partial deoxygenation, Hb LR may exhibit increased susceptibility to methemoglobin formation.
- This increased susceptibility is linked to a higher oxidation and lower reduction rate.
Conclusions:
- The stabilized R-state of Hb LR, while conferring in vitro stability, may lead to increased methemoglobin formation in vivo under specific physiological conditions.
- Further research is needed to fully understand the clinical implications of altered methemoglobin formation in Hb LR patients.