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Study of correlation between lead-induced cytotoxicity and nitric oxide production in PC12 cells
Ali M Sharifi1, Seyed Hadi Mousavi, Masoomeh Bakhshayesh
1Department of Pharmacology and Cellular and Molecular Research Center, School of Medicine, Iran University of Medical Sciences, P.O. Box 14155-6183, Tehran, Iran. sharifal@yahoo.com
Abstract:
Despite reduction in its exposure, lead remains a major health problem. The primary target of lead toxicity is the central nervous system. The cellular, intracellular and molecular mechanisms of lead neurotoxicity are numerous, such as induction of apoptosis and interfering with Ca2+ dependent enzyme like nitric oxide synthase (NOS). To investigate the cytotoxic effect of lead on rat pheochromocytoma (PC12) cells, as a suitable model for neuroscience study, and possible correlation between lead toxicity and nitric oxide (NO) production, this study was performed. The current results showed that lead could induce cytotoxicity as well as NO production in a dose dependent manner in PC12 cells after 24h. The cytotoxicity was positively correlated with increased NOx (nitrite and nitrate) production in these cells. L-NAME, a NOS inhibitor, treatment (2.5 mM) could reverse this cytotoxicity. It can be concluded that lead-induced cytotoxicity in PC12 cells could partly be mediated by higher NO production.
Insights
Lead exposure causes central nervous system toxicity. This study found lead increases cell damage and nitric oxide (NO) production in neural cells, suggesting NO mediates lead
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Lead exposure remains a significant health concern, primarily targeting the central nervous system.
- Lead neurotoxicity involves complex mechanisms, including apoptosis induction and interference with calcium-dependent enzymes like nitric oxide synthase (NOS).
Purpose of the Study:
- To investigate the cytotoxic effects of lead on rat pheochromocytoma (PC12) cells.
- To explore the potential correlation between lead toxicity and nitric oxide (NO) production in PC12 cells.
Main Methods:
- PC12 cells were exposed to varying doses of lead for 24 hours.
- Nitrite and nitrate (NOx) levels were measured to assess NO production.
- The effect of L-NAME, a NOS inhibitor, on lead-induced cytotoxicity was evaluated.
Main Results:
- Lead exposure induced dose-dependent cytotoxicity and increased NO production in PC12 cells.
- A positive correlation was observed between lead-induced cytotoxicity and NOx levels.
- Inhibition of NOS with L-NAME partially reversed the cytotoxic effects of lead.
Conclusions:
- Lead-induced cytotoxicity in PC12 cells is partly mediated by elevated nitric oxide (NO) production.
- PC12 cells serve as a valuable model for studying lead neurotoxicity mechanisms.
- Understanding the role of NO in lead toxicity may inform future therapeutic strategies.
