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PLoS One. 2013 Aug 29;8(8):e70488. doi: 10.1371/journal.pone.0070488. eCollection 2013.

In situ Raman study of redox state changes of mitochondrial cytochromes in a perfused rat heart.

Author information

1
Biophysics Department, Biological faculty, Moscow State University, Moscow, Russia.

Abstract

We developed a Raman spectroscopy-based approach for simultaneous study of redox changes in c-and b-type cytochromes and for a semiquantitative estimation of the amount of oxygenated myoglobin in a perfused rat heart. Excitation at 532 nm was used to obtain Raman scattering of the myocardial surface of the isolated heart at normal and hypoxic conditions. Raman spectra of the heart under normal pO2 demonstrate unique peaks attributable to reduced c-and b-type cytochromes and oxymyoglobin (oMb). The cytochrome peaks decreased in intensity upon FCCP treatment, as predicted from uncoupling mitochondrial respiration. Conversely, transient hypoxia causes the reversible increase in the intensity of peaks assigned to cytochromes c and c1, reflecting electron stacking proximal to cytochrome oxidase due to the lack of terminal electron acceptor O2. Intensities of peaks assigned to oxy- and deoxyhemoglobin were used for the semiquantitative estimation of oMb deoxygenation that was found to be of approximately 50[Formula: see text] under hypoxia conditions.

PMID:
24009655
PMCID:
PMC3757006
DOI:
10.1371/journal.pone.0070488
[Indexed for MEDLINE]
Free PMC Article

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