Meijer and Vloedman's histochemical demonstration of mitochondrial coupling obeys Lambert-Beer's law in the myocardium

Eva L Peters, David Comerford, Frédéric M Vaz, Willem J van der Laarse

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Uncoupling of mitochondrial proton pumping and adenosine triphosphate (ATP) production lowers mitochondrial efficiency. Current methods to determine mitochondrial efficiency require substantial amounts of tissue and permeabilization or isolation procedures. A simple histochemical method has been described by Meijer and Vloedman (Histochemistry 69:217-232, 1980, https://doi.org/10.1007/BF00489769 ), but this was not quantitative. We found linear correlations between (1) absorbance and sections thickness and (2) absorbance and incubation time. Because the method obeys Lambert-Beer's law, we can estimate ATP/O2 ratios for healthy and overloaded right-sided rat myocardium. We related mitochondrial efficiency to the ratio between cardiolipin and its precursor phosphatidylglycerol. We found a non-linear relationship between mitochondrial efficiency and this ratio, indicating that lower mitochondrial efficiency as found in experimental pulmonary hypertension may be due to altered composition of the mitochondrial inner membrane. We conclude that the histochemical method of Meijer and Vloedman can be applied to quantify mitochondrial efficiency.

Original languageEnglish
Pages (from-to)85-90
Number of pages6
JournalHistochemistry and Cell Biology
Volume151
Issue number1
Early online date29 Aug 2018
DOIs
Publication statusPublished - 29 Jan 2019

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