| Autor: |
Zachary R. Markovich, Jessica H. Hartman, Ian T. Ryde, Kathleen A. Hershberger, Abigail S. Joyce, Patrick L. Ferguson, Joel N. Meyer |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Current Research in Toxicology, Vol 3, Iss , Pp 100084- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2666-027X |
| DOI: |
10.1016/j.crtox.2022.100084 |
| Popis: |
Aims: Mitochondrial dysfunction is implicated in several diseases, including neurological disorders such as Parkinson’s disease. However, there is uncertainty about which of the many mechanisms by which mitochondrial function can be disrupted may lead to neurodegeneration. Pentachlorophenol (PCP) is an organic pollutant reported to cause mitochondrial dysfunction including oxidative stress and mitochondrial uncoupling. We investigated the effects of PCP exposure in Caenorhabditis elegans, including effects on mitochondria and dopaminergic neurons. We hypothesized that mild mitochondrial uncoupling by PCP would impair bioenergetics while decreasing oxidative stress, and therefore would not cause dopaminergic neurodegeneration. Results: A 48-hour developmental exposure to PCP causing mild growth delay (∼10 % decrease in growth during 48 h, covering all larval stages) reduced whole-organism ATP content > 50 %, and spare respiratory capacity ∼ 30 %. Proton leak was also markedly increased. These findings suggest a main toxic mechanism of mitochondrial uncoupling rather than oxidative stress, which was further supported by a concomitant shift toward a more reduced cellular redox state measured at the whole organism level. However, exposure to PCP did not cause dopaminergic neurodegeneration, nor did it sensitize animals to a neurotoxic challenge with 6-hydroxydopamine. Whole-organism uptake and PCP metabolism measurements revealed low overall uptake of PCP in our experimental conditions (50 μM PCP in the liquid exposure medium resulted in organismal concentrations of |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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