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Mitochondrial impact on nerve growth factor production in vascular smooth muscle-derived cells
T B Sherer1, P S Neff, J K Parks
1Center for the Study of Neurodegenerative Disease, Health Science Center, University of Virginia, MR4 Box 5148, Charlottesville, VA 22908, USA.
Abstract:
Ht30/=Ht5). Cells with reduced mitochondrial activity also showed abnormal responses to the stimulation of NGF output. Thrombin and phorbol ester elevated NGF production from Ht100, Ht30 and Ht10 cells, but not from Ht5 cells. Ht30 cells, despite secreting less NGF basally than Ht100 cells, reached a similar or greater NGF output upon stimulation. Mitogens increased NGF output and NGF mRNA levels with the largest effect on NGF protein in Ht30 cells. Free radical production and the ability of cells to respond to NGF-inducing agents were related. These data suggest that chronic impairment of mitochondrial function associates with disturbances in cellular production of a signaling protein.
Insights
Reduced mitochondrial function in cells impairs nerve growth factor (NGF) production and response. This study links mitochondrial health to cellular signaling protein disturbances.
Area of Science:
- Cell Biology
- Neuroscience
- Biochemistry
Background:
- Mitochondrial dysfunction is implicated in various diseases.
- Nerve growth factor (NGF) is crucial for neuronal survival and function.
- The relationship between mitochondrial activity and NGF production is not fully understood.
Purpose of the Study:
- To investigate the impact of impaired mitochondrial function on NGF production and cellular response.
- To explore the correlation between free radical production and cellular responsiveness to NGF-inducing agents.
Main Methods:
- Utilized different cell lines (Ht100, Ht30, Ht10, Ht5) with varying mitochondrial activity.
- Stimulated cells with thrombin, phorbol ester, and mitogens to assess NGF output.
- Measured NGF production, NGF mRNA levels, and free radical production.
Main Results:
- Cells with reduced mitochondrial activity exhibited abnormal responses to NGF stimulation.
- Thrombin and phorbol ester increased NGF production in Ht100, Ht30, and Ht10 cells, but not Ht5 cells.
- Mitogens enhanced NGF output and mRNA levels, with the most significant effect on NGF protein in Ht30 cells.
- Free radical production correlated with the ability of cells to respond to NGF-inducing agents.
Conclusions:
- Chronic impairment of mitochondrial function is associated with disruptions in cellular signaling protein production, specifically NGF.
- Cellular responses to NGF and NGF production are sensitive to mitochondrial health.
- These findings highlight a potential link between mitochondrial dysfunction and altered neurotrophic factor signaling.