Sirtuin 3-mediated deacetylation of superoxide dismutase 2 ameliorates sodium fluoride-induced mitochondrial dysfunction in porcine oocytes.
Level 5 - mechanism / opinion, no new human data
In vitro animal (porcine) oocyte study
PubMed 37944611 · doi:10.1016/j.scitotenv.2023.168306
What was done
Porcine oocytes were treated in vitro with 50 μg/mL sodium fluoride (NaF) to induce a model of mitochondrial damage. Investigators assessed the impact of NaF on mitochondrial reactive oxygen species (mtROS), mitochondrial membrane potential, mitochondrial DNA (mtDNA) copy number, and mtDNA damage. They subsequently evaluated the therapeutic and mechanistic effects of the mtROS scavenger Mito-TEMPO and the SIRT3 activator honokiol on SOD2 acetylation (specifically at K122), SIRT3 expression, and oocyte developmental competence.
What was found
The abstract reports directional findings without numerical data. NaF exposure elevated mtROS levels, dissipated mitochondrial membrane potential, altered mtDNA copy number, caused mtDNA damage, increased SOD2 acetylation, and decreased SIRT3 expression. Scavenging mtROS with Mito-TEMPO restored oocyte developmental competence. Honokiol promoted SIRT3 expression and the deacetylation of SOD2 at K122, which cleared excess mtROS and restored mitochondrial function.
Why it matters
This study delineates the SIRT3/SOD2 pathway as a key mediator of fluoride-induced oocyte damage, identifying honokiol as a potential protective agent against environmental fluoride reproductive toxicity.
Limits
The study was conducted entirely in vitro using porcine oocytes rather than in vivo models or human cells. The abstract does not provide exact sample sizes, replicate numbers, or quantitative effect sizes and confidence intervals.
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