Intracellular Energy-Transfer Networks and High-Resolution Respirometry: A Convenient Approach for Studying Their Function
Overview
Chemistry
Molecular Biology
Affiliations
Compartmentalization of high-energy phosphate carriers between intracellular micro-compartments is a phenomenon that ensures efficient energy use. To connect these sites, creatine kinase (CK) and adenylate kinase (AK) energy-transfer networks, which are functionally coupled to oxidative phosphorylation (OXPHOS), could serve as important regulators of cellular energy fluxes. Here, we introduce how selective permeabilization of cellular outer membrane and high-resolution respirometry can be used to study functional coupling between CK or AK pathways and OXPHOS in different cells and tissues. Using the protocols presented here the ability of creatine or adenosine monophosphate to stimulate OXPHOS through CK and AK reactions, respectively, is easily observable and quantifiable. Additionally, functional coupling between hexokinase and mitochondria can be investigated by monitoring the effect of glucose on respiration. Taken together, high-resolution respirometry in combination with permeabilization is a convenient approach for investigating energy-transfer networks in small quantities of cells and tissues in health and in pathology.
Anthrax lethal toxin exerts potent metabolic inhibition of the cardiovascular system.
Liu J, Zuo Z, Fattah R, Finkel T, Leppla S, Liu S mBio. 2024; 15(12):e0216024.
PMID: 39508614 PMC: 11633152. DOI: 10.1128/mbio.02160-24.
Frusciante M, Signori M, Parmeggiani B, Grings M, Pramio J, Cecatto C Cell Biochem Biophys. 2023; 81(4):683-695.
PMID: 37589888 DOI: 10.1007/s12013-023-01161-0.
Colorectal polyps increase the glycolytic activity.
Rebane-Klemm E, Reinsalu L, Puurand M, Shevchuk I, Bogovskaja J, Suurmaa K Front Oncol. 2023; 13:1171887.
PMID: 37342183 PMC: 10277630. DOI: 10.3389/fonc.2023.1171887.
Wolframin deficiency is accompanied with metabolic inflexibility in rat striated muscles.
Tepp K, Aid-Vanakova J, Puurand M, Timohhina N, Reinsalu L, Tein K Biochem Biophys Rep. 2022; 30:101250.
PMID: 35295995 PMC: 8918847. DOI: 10.1016/j.bbrep.2022.101250.
Reinsalu L, Puurand M, Chekulayev V, Miller S, Shevchuk I, Tepp K Front Oncol. 2021; 11:698951.
PMID: 34381722 PMC: 8351413. DOI: 10.3389/fonc.2021.698951.