Mitochondria-cytoskeleton interaction: Distribution of β-tubulins in cardiomyocytes and HL-1 cells.

Abstract : Mitochondria-cytoskeleton interactions were analyzed in adult rat cardiomyocytes and in cancerous non-beating HL-1 cells of cardiac phenotype. We show that in adult cardiomyocytes βII-tubulin is associated with mitochondrial outer membrane (MOM). βI-tubulin demonstrates diffused intracellular distribution, βIII-tubulin is colocalized with Z-lines and βIV-tubulin forms microtubular network. HL-1 cells are characterized by the absence of βII-tubulin, by the presence of bundles of filamentous βIV-tubulin and diffusely distributed βI- and βIII-tubulins. Mitochondrial isoform of creatine kinase (MtCK), highly expressed in cardiomyocytes, is absent in HL-1 cells. Our results show that high apparent K(m) for exogenous ADP in regulation of respiration and high expression of MtCK both correlate with the expression of βII-tubulin. The absence of βII-tubulin isotype in isolated mitochondria and in HL-1 cells results in increased apparent affinity of oxidative phosphorylation for exogenous ADP. This observation is consistent with the assumption that the binding of βII-tubulin to mitochondria limits ADP/ATP diffusion through voltage-dependent anion channel of MOM and thus shifts energy transfer via the phosphocreatine pathway. On the other hand, absence of both βII-tubulin and MtCK in HL-1 cells can be associated with their more glycolysis-dependent energy metabolism which is typical for cancer cells (Warburg effect).
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BBA - Biochimica et Biophysica Acta, Elsevier, 2011, 1807 (4), pp.458-69. 〈10.1016/j.bbabio.2011.01.010〉
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Soumis le : lundi 17 octobre 2011 - 15:53:57
Dernière modification le : mardi 23 janvier 2018 - 10:56:32

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Rita Guzun, Minna Karu-Varikmaa, Marcela Gonzalez-Granillo, Andrey Kuznetsov, Lauriane Michel, et al.. Mitochondria-cytoskeleton interaction: Distribution of β-tubulins in cardiomyocytes and HL-1 cells.. BBA - Biochimica et Biophysica Acta, Elsevier, 2011, 1807 (4), pp.458-69. 〈10.1016/j.bbabio.2011.01.010〉. 〈inserm-00633134〉

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