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The radical-binding lipocalin A1M binds to a Complex I subunit and protects mitochondrial structure and function.

Gram, Magnus LU orcid ; Wester Rosenlöf, Lena LU ; Kotarsky, Heike LU ; Olofsson, Tor LU ; Leanderson, Tomas LU ; Mörgelin, Matthias LU ; Fellman, Vineta LU orcid and Åkerström, Bo LU (2013) In Antioxidants & Redox Signaling 18(16). p.2017-2028
Abstract
Aims: During cell death, energy-consuming cell degradation and recycling programs are performed. Maintenance of energy-delivery during cell death is therefore crucial but the mechanisms to keep the mitochondrial functions intact during these processes are poorly understood. We have investigated the hypothesis that the heme- and radical-binding ubiquitous protein A1M (α<sub>1</sub>-microglobulin) is involved in protection of the mitochondria against oxidative insult during cell death. Results: Using blood cells, keratinocytes and liver cells, we show that A1M binds with high affinity to apoptosis-induced cells and is localized to mitochondria. The mitochondrial Complex I subunit NDUFAB1 was identified as a major molecular target... (More)
Aims: During cell death, energy-consuming cell degradation and recycling programs are performed. Maintenance of energy-delivery during cell death is therefore crucial but the mechanisms to keep the mitochondrial functions intact during these processes are poorly understood. We have investigated the hypothesis that the heme- and radical-binding ubiquitous protein A1M (α<sub>1</sub>-microglobulin) is involved in protection of the mitochondria against oxidative insult during cell death. Results: Using blood cells, keratinocytes and liver cells, we show that A1M binds with high affinity to apoptosis-induced cells and is localized to mitochondria. The mitochondrial Complex I subunit NDUFAB1 was identified as a major molecular target of the A1M-binding. Furthermore, A1M was shown to inhibit the swelling of mitochondria, and to reverse the severely abrogated ATP-production of mitochondria when exposed to heme and ROS. Innovation: Import of the radical- and heme-binding protein A1M from the extracellular compartment confers protection of mitochondrial structure and function during cellular insult. Conclusion: A1M binds to a subunit of Complex I and has a role in assisting the mitochondria to maintain its energy delivery during cell death. A1M may also, at the same time, counteract and eliminate the ROS generated by the mitochondrial respiration to prevent oxidative damage to surrounding healthy tissue. (Less)
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Antioxidants & Redox Signaling
volume
18
issue
16
pages
2017 - 2028
publisher
Mary Ann Liebert, Inc.
external identifiers
  • wos:000317724500001
  • pmid:23157686
  • scopus:84878234886
  • pmid:23157686
ISSN
1557-7716
DOI
10.1089/ars.2012.4658
language
English
LU publication?
yes
id
eaf05a00-0a12-4ffa-8458-8eb30f369630 (old id 3218902)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/23157686?dopt=Abstract
date added to LUP
2016-04-01 09:59:46
date last changed
2022-01-25 18:43:45
@article{eaf05a00-0a12-4ffa-8458-8eb30f369630,
  abstract     = {{Aims: During cell death, energy-consuming cell degradation and recycling programs are performed. Maintenance of energy-delivery during cell death is therefore crucial but the mechanisms to keep the mitochondrial functions intact during these processes are poorly understood. We have investigated the hypothesis that the heme- and radical-binding ubiquitous protein A1M (α&lt;sub&gt;1&lt;/sub&gt;-microglobulin) is involved in protection of the mitochondria against oxidative insult during cell death. Results: Using blood cells, keratinocytes and liver cells, we show that A1M binds with high affinity to apoptosis-induced cells and is localized to mitochondria. The mitochondrial Complex I subunit NDUFAB1 was identified as a major molecular target of the A1M-binding. Furthermore, A1M was shown to inhibit the swelling of mitochondria, and to reverse the severely abrogated ATP-production of mitochondria when exposed to heme and ROS. Innovation: Import of the radical- and heme-binding protein A1M from the extracellular compartment confers protection of mitochondrial structure and function during cellular insult. Conclusion: A1M binds to a subunit of Complex I and has a role in assisting the mitochondria to maintain its energy delivery during cell death. A1M may also, at the same time, counteract and eliminate the ROS generated by the mitochondrial respiration to prevent oxidative damage to surrounding healthy tissue.}},
  author       = {{Gram, Magnus and Wester Rosenlöf, Lena and Kotarsky, Heike and Olofsson, Tor and Leanderson, Tomas and Mörgelin, Matthias and Fellman, Vineta and Åkerström, Bo}},
  issn         = {{1557-7716}},
  language     = {{eng}},
  number       = {{16}},
  pages        = {{2017--2028}},
  publisher    = {{Mary Ann Liebert, Inc.}},
  series       = {{Antioxidants & Redox Signaling}},
  title        = {{The radical-binding lipocalin A1M binds to a Complex I subunit and protects mitochondrial structure and function.}},
  url          = {{https://lup.lub.lu.se/search/files/1462059/3735584.pdf}},
  doi          = {{10.1089/ars.2012.4658}},
  volume       = {{18}},
  year         = {{2013}},
}