| Full text | |
| Author(s): |
Kakimoto, Pamela A. H. B.
[1]
;
Tamaki, Fabio K.
[1]
;
Cardoso, Ariel R.
[1]
;
Marana, Sandro R.
[1]
;
Kowaltowski, Alicia J.
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, Inst Quim, Dept Bioquim, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | REDOX BIOLOGY; v. 4, p. 375-380, APR 2015. |
| Web of Science Citations: | 7 |
| Abstract | |
Enhanced mitochondrial generation of oxidants, including hydrogen peroxide (H2O2), is related to a large number of pathological conditions, including diet-induced obesity and steatohepatosis. Indeed, we have previously shown that high fat diets increase the generation of H2O2 in liver mitochondria energized by activated fatty acids. Here, we further study fatty-acid induced H2O2 release in liver mitochondria, and determine the characteristics that regulate it. We find that this production of H2O2 is independent of mitochondrial inner membrane integrity and insensitive to purine nucleotides. On the other hand, palmitate-induced H2O2 production is strongly enhanced by high fat diets and is pH-sensitive, with a peak at a matrix pH of similar to 8.5. Using recombinantly expressed human very long chain acyl-CoA dehydrogenase, we are able to demonstrate that palmitate-induced H2O2 release may be ascribed to the activity of this enzyme alone, acting as an oxidase. Our results add to a number of findings indicating that sources outside of the electron transport chain can generate significant, physiopathologically relevant, amounts of oxidants in mitochondria. (C) 2015 The Authors. Published by Elsevier B.V. (AU) | |
| FAPESP's process: | 12/50500-7 - Involvement of the RTG-dependent retrograde signaling pathway in the maintenance of mitochondrial activity during ageing in Saccharomyces cerevisiae |
| Grantee: | Fernanda Marques da Cunha |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/07937-8 - Redoxome - Redox Processes in Biomedicine |
| Grantee: | Ohara Augusto |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |