Regulation of mitochondrial matrix volume.
Mitochondrial volume homeostasis is a housekeeping cellular function essential for maintaining the structural integrity of the organelle. Changes in mitochondrial volume have been associated with a wide range of important biological functions and pathologies. Mitochondrial matrix volume is controlled by osmotic balance between cytosol and mitochondria. Any dysbalance in the fluxes of the main intracellular ion, potassium, will thus affect the osmotic balance between cytosol and the matrix and promote the water movement between these two compartments. It has been hypothesized that activity of potassium efflux pathways exceeds the potassium influx in functioning mitochondria and that potassium concentration in matrix could be actually lower than in cytoplasm. This hypothesis provides a clear-cut explanation for the mitochondrial swelling observed after mitochondrial depolarization, mitochondrial calcium overload, or opening of permeability transition pore. It should also be noted that the rate of water flux into or out of the mitochondrion is determined not only by the osmotic gradient that acts as the driving force for water transport but also by the water permeability of the inner membrane. Recent data suggest that the mitochondrial inner membrane has also specific water channels, aquaporins, which facilitate water movement between cytoplasm and matrix. This review discusses different phases of mitochondrial swelling and summarizes the potential effects of mitochondrial swelling on cell function.
Kaasik
Allen
A
Department of Pharmacology, Centre of Molecular and Clinical Medicine, University of Tartu, Ravila 19, 51014 Tartu, Estonia. Allen.Kaasik@ut.ee
Safiulina
Dzhamilja
D
Zharkovsky
Alexander
A
Veksler
Vladimir
V
D000818:Animals; D020346:Aquaporins / Q000502:physiology; D002118:Calcium / Q000502:physiology; D002468:Cell Physiological Phenomena; D006706:Homeostasis / Q000502:physiology*; D006801:Humans; D008564:Membrane Potentials / Q000502:physiology; D008928:Mitochondria / Q000378:metabolism* / Q000502:physiology / Q000648:ultrastructure; D008933:Mitochondrial Swelling / Q000502:physiology; D011188:Potassium / Q000378:metabolism
D020346:Aquaporins; D011188:Potassium; D002118:Calcium