What question did this study set out to answer?

To determine the direct effects of oxygen-derived free radicals on myocardial oxymyoglobin deoxygenation, haem removal, and subsequent free iron release.

November 1, 1989Biochemical JournalOpen Access

Effects of oxyradicals on oxymyoglobin. Deoxygenation, haem removal and iron release

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Authors

MPM.R.N. PrasadInstitute of Liver and Biliary Sciences RERichard M. EngelmanCardiac Surgery RJRandy M. JonesBattelle

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Implication

Experimental study demonstrates hydrogen peroxide drives oxymyoglobin oxidation and haem removal before iron release, indicating a pathway for free radical-mediated myocardial injury.

Key Points

To determine the direct effects of oxygen-derived free radicals on myocardial oxymyoglobin deoxygenation, haem removal, and subsequent free iron release.
Generated reactive oxygen species using an in vitro xanthine and xanthine oxidase enzymatic system.
Assessed oxymyoglobin transformation, ferrimyoglobin formation, and haem loss via spectrophotometric absorbance peaks at 581 nm and 415 nm.
Tested inhibition using catalase, superoxide dismutase, and the iron chelator deferoxamine.
For each 10 nmol loss of oxymyoglobin, approximately 5 nmol converted to ferrimyoglobin and 5 nmol underwent haem removal, both blocked by catalase but not superoxide dismutase alone.
Oxyradical exposure resulted in 3 µM free iron release, which occurred secondary to and was at least 5-fold lower than the 15 nmol total loss of oxymyoglobin.

Cite This Study

Prasad et al. (1989) studied this question.

synapsesocial.com/papers/69d945c83e67f8d1386840de https://doi.org/10.1042/bj2630731

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Implication

Experimental study demonstrates hydrogen peroxide drives oxymyoglobin oxidation and haem removal before iron release, indicating a pathway for free radical-mediated myocardial injury.

Effects of oxyradicals on oxymyoglobin. Deoxygenation, haem removal and iron release

Discussion

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Implication

Key Points

Cite This Study

Effects of oxyradicals on oxymyoglobin. Deoxygenation, haem removal and iron release

Discussion

Member takes

Implication

Key Points

Cite This Study

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