Exogenous cardiolipin localizes to mitochondria and prevents TAZ knockdown-induced apoptosis in myeloid progenitor cells.

Autor: Ikon N; Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland CA, 94609, United States., Su B; Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland CA, 94609, United States., Hsu FF; Department of Medicine, Campus Box 8127, Washington University School of Medicine, 660S. Euclid Ave, St. Louis, MO 63110, United States., Forte TM; Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland CA, 94609, United States., Ryan RO; Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland CA, 94609, United States. Electronic address: rryan@chori.org.
Jazyk: angličtina
Zdroj: Biochemical and biophysical research communications [Biochem Biophys Res Commun] 2015 Aug 21; Vol. 464 (2), pp. 580-5. Date of Electronic Publication: 2015 Jul 09.
DOI: 10.1016/j.bbrc.2015.07.012
Abstrakt: The concentration and composition of cardiolipin (CL) in mitochondria are altered in age-related heart disease, Barth Syndrome, and other rare genetic disorders, resulting in mitochondrial dysfunction. To explore whether exogenous CL can be delivered to cells, CL was combined with apolipoprotein A-I to generate water-soluble, nanoscale complexes termed nanodisks (ND). Mass spectrometry of HL60 myeloid progenitor cell extracts revealed a 30-fold increase in cellular CL content following incubation with CL-ND. When CL-ND containing a fluorescent CL analogue was employed, confocal microscopy revealed CL localization to mitochondria. The ability of CL-ND to elicit a physiological response was examined in an HL60 cell culture model of Barth Syndrome neutropenia. siRNA knockdown of the phospholipid transacylase, tafazzin (TAZ), induced apoptosis in these cells. When TAZ knockdown cells were incubated with CL-ND, the apoptotic response was attenuated. Thus, CL-ND represent a potential intervention strategy for replenishment of CL in Barth Syndrome, age-related heart disease, and other disorders characterized by depletion of this key mitochondrial phospholipid.
(Copyright © 2015 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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