Abstract
Peroxisome proliferator-activated receptors (PPARs) play roles in neural cells by regulating energy balance, cell proliferation and anti-oxidant responses although the molecular mechanisms underlying such roles are unclear. Chronic exposure to excess manganese (Mn) leads to neurotoxicity, although Mn-induced neurotoxic mechanisms have not been fully elucidated. We hypothesized Mn neurotoxicity differentially alters the expression of PPARs. We investigated the effects of manganese chloride treatment (0.01–4 mM) on protein expression of PPAR isoforms (α, β, and γ) in human astrocytoma (U87) and neuroblastoma (SK-N-SH) cells. The two cell types expressed the 3 PPAR isoforms differentially: their expression of the PPARs was altered by Mn-treatment. Furthermore, nuclear and cytosolic fractions derived from the 2 cell types, with and without Mn-treatment, exhibited marked differences in the protein content of PPARs. Our results constitute the first demonstration that the PPAR signaling pathway may assume pathophysiological importance in Mn neurotoxicity.
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Abbreviations
- BCA:
-
Bicinchoninic acid
- BSA:
-
Bovine serum albumin
- DMEM:
-
Minimum essential medium eagle
- GABA:
-
γ-aminobutyric acid
- HEPES:
-
N-2 hydroxyethylpiperazine-N′-2-ethane sulfonic acid
- HIF:
-
Hypoxia-inducible factor
- Mn:
-
Manganese
- PPARs:
-
Peroxisome proliferator-activated receptors
- PVDF:
-
Polyvinylidene fluoride
- RXRs:
-
Retinoid X receptors
- SDS:
-
Sodium dodecyl sulfate
- SK-N-SH:
-
A human neuroblastoma cell line
- U87:
-
A human astrocytoma cell line
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Acknowledgments
Our studies were supported by a grant from Idaho Biomedical Research Infrastructure Network (NIH NCRR BRINIP20RR016454), an Idaho State University Faculty Research Committee grant, and a small project grant from the Mountain States Tumor and Medical Research Institute.
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Isaac, A.O., Kawikova, I., Bothwell, A.L.M. et al. Manganese Treatment Modulates the Expression of Peroxisome Proliferator-activated Receptors in Astrocytoma and Neuroblastoma Cells. Neurochem Res 31, 1305–1316 (2006). https://doi.org/10.1007/s11064-006-9173-0
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DOI: https://doi.org/10.1007/s11064-006-9173-0