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Updated: May 25, 2026
Cellular Redox Profiling Using High-content Microscopy
Published on: May 14, 2017
Microarray genomic profile of mitochondrial and oxidant response in manganese chloride treated PC12 cells
Equar Taka1, Elizabeth Mazzio, Karam F A Soliman
1College of Pharmacy and Pharmaceutical Sciences, Florida A & M University, Tallahassee, FL 32307, USA.
Abstract:
Environmental or occupational exposure to high levels of manganese (Mn) can lead to manganism, a symptomatic neuro-degenerative disorder similar to idiopathic Parkinson's disease. The underlying mechanism of Mn neurotoxicity remains unclear. In this study, we evaluate the primary toxicological events associated with MnCl(2) toxicity in rat PC12 cells using whole genome cDNA microarray, RT-PCR, Western blot and functional studies. The results show that a sub-lethal dose range (38-300 microM MnCl(2)) initiated slight metabolic stress evidenced by heightened glycolytic rate and induction of enolase/aldolase - gene expression. The largest shift observed in the transcriptome was MnCl(2) induction of heme-oxygenase 1 (HO-1) [7.7 fold, p<0.001], which was further corroborated by RT-PCR and Western blot studies. Concentrations in excess of 300 microM corresponded to dose dependent loss of cell viability which was associated with enhanced production of H(2)O(2) concomitant to elevation of gene expression for diverse antioxidant enzymes; biliverdin reductase, arsenite inducible RNA associated protein, dithiolethione-inducible gene-1 (DIG-1) and thioredoxin reductase 1. Moreover, Mn initiated significant reduction of gene expression of mitochondrial glutaryl-coenzyme A dehydrogenase (GCDH), an enzyme involved with glutaric acidemia, oxidative stress, lipid peroxidation and striatal degeneration observed in association with severe dystonic-dyskinetic movement disorder. Future research will be required to elucidate a defined role for HO-1 and GCDH in Mn toxicity.
Insights
Manganese (Mn) exposure causes neurotoxicity. This study reveals MnCl(2) induces heme-oxygenase 1 (HO-1) and reduces mitochondrial glutaryl-coenzyme A dehydrogenase (GCDH) gene expression, offering insights into manganism mechanisms.
Area of Science:
- Neurotoxicology
- Molecular Biology
- Cellular Biology
Background:
- Environmental and occupational manganese (Mn) exposure can cause manganism, a neurodegenerative disorder resembling Parkinson's disease.
- The precise mechanisms underlying Mn neurotoxicity are not fully understood.
- This study investigates the cellular and molecular responses to manganese chloride (MnCl2) toxicity in rat PC12 cells.
Purpose of the Study:
- To elucidate the primary toxicological events and molecular changes induced by MnCl2 exposure in rat PC12 cells.
- To identify key genes and pathways affected by MnCl2 toxicity.
- To explore the potential roles of heme-oxygenase 1 (HO-1) and glutaryl-coenzyme A dehydrogenase (GCDH) in Mn neurotoxicity.
Main Methods:
- Whole genome cDNA microarray analysis to assess global gene expression changes.
- Reverse transcription-polymerase chain reaction (RT-PCR) to validate gene expression levels.
- Western blot analysis to confirm protein expression.
- Functional studies to evaluate cell viability and metabolic stress.
Main Results:
- Sub-lethal MnCl2 doses (38-300 microM) induced metabolic stress, evidenced by increased glycolysis and enolase/aldolase gene expression.
- MnCl2 significantly upregulated heme-oxygenase 1 (HO-1) expression (7.7-fold increase).
- Higher MnCl2 concentrations (>300 microM) led to dose-dependent cell death, increased hydrogen peroxide (H2O2) production, and elevated expression of antioxidant enzymes.
- MnCl2 significantly downregulated the gene expression of mitochondrial glutaryl-coenzyme A dehydrogenase (GCDH).
Conclusions:
- MnCl2 exposure triggers distinct cellular responses, including metabolic stress and oxidative stress pathways.
- The induction of HO-1 and the reduction of GCDH expression are significant molecular events associated with MnCl2 toxicity.
- Further research is needed to clarify the specific roles of HO-1 and GCDH in the pathogenesis of manganism.
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