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Cited by 238

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Bnip3-mediated mitochondrial autophagy is independent of the mitochondrial permeability transition pore

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Quinsay, Melissa N., Thomas, Robert L., Lee, Youngil, Gustafsson, Åsa B.·2010·Autophagy

Abstract

Bnip3 is a pro-apoptotic BH3-only protein which is associated with mitochondrial dysfunction and cell death. Bnip3 is also a potent inducer of autophagy in many cells. In this study, we have investigated the mechanism by which Bnip3 induces autophagy in adult cardiac myocytes. Overexpression of Bnip3 induced extensive autophagy in adult cardiac myocytes. Fluorescent microscopy studies and ultrastructural analysis revealed selective degradation of mitochondria by autophagy in myocytes overexpressing Bnip3. Oxidative stress and increased levels of intracellular Ca(2+) have been reported by others to induce autophagy, but Bnip3-induced autophagy was not abolished by antioxidant treatment or the Ca(2+) chelator BAPT A-AM. We also investigated the role of the mitochondrial permeability transition pore (mPTP) in Bnip3-induced autophagy. Although the mPTP has previously been implicated in the induction of autophagy and selective removal of damaged mitochondria by autophagosomes, mitochondria sequestered by autophagosomes in Bnip3-treated cardiac myocytes had not undergone permeability transition and treatment with the mPTP inhibitor cyclosporine A did not inhibit mitochondrial autophagy in cardiac myocytes. Moreover, cyclophilin D (cypD) is an essential component of the mPTP and Bnip3 induced autophagy to the same extent in embryonic fibroblasts isolated from wild-type and cypD-deficient mice. These results support a model where Bnip3 induces selective removal of the mitochondria in cardiac myocytes and that Bnip3 triggers induction of autophagy independent of Ca(2+), ROS generation, and mPTP opening.

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Metadata

Authors
Quinsay, M. N., Thomas, R. L., Lee, Y., & Gustafsson, Å. B.
Venue
Autophagy
Published
2010-10
Volume
6
Issue
7
Pages
855-862
ISSN
  • 1554-8627 (ISSN-L)
  • 1554-8635
OpenAlex
W1966995952
Cited by
238
References
8
FWCI
6.08
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Bnip3-mediated mitochondrial autophagy is independent of the mitochondrial permeability transition pore. https://app.cochat.ai/papers/10.4161/auto.6.7.13005
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Quinsay, M. N., Thomas, R. L., Lee, Y., & Gustafsson, Å. B. (2010). Bnip3-mediated mitochondrial autophagy is independent of the mitochondrial permeability transition pore. Autophagy. https://doi.org/10.4161/auto.6.7.13005

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.