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Adipose stromal cells-conditioned medium blocks 6-hydroxydopamine-induced neurotoxicity and reactive oxygen species
Huiying Gu1, Jimmy Wang, Nicole Du
1Department of Neurology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
Abstract:
A recent in vivo study suggested that the delivery of adipose stromal cells (ASCs) protected rat brains from 6-hydroxydopamine (6-OHDA)-induced neurotoxicity. However, the molecular mechanism that underlies this neuroprotection remains unknown. It was suggested that ASCs-induced neuroprotection possibly resulting from released factors from ASCs. In this study, we investigated whether and how cell-free conditioned media collected from ASCs (ASC-CM) protect neurons against neurotoxicity induced by 6-OHDA in cultured rat rostral mesencephalic neurons (RMN) and cerebellar granule neurons (CGN). We now report that ASC-CM protects both RMN and CGN against 6-OHDA neurotoxicity. Exposure of CGN to 6-OHDA resulted in a significant increases in neuronal ROS and cell death. As expected, pretreatments with ASC-CM dramatically block both 6-OHDA-induced ROS and neurotoxicity. Additionally, ASC-CM also directly attenuated H2O2-induced neuronal death. Our results suggest that ASC-CM could block 6-OHDA-induced neuronal death by inhibiting both 6-OHDA-induced ROS generation and ROS-induced neurotoxicity in neurons. Both antioxidative and neuroprotective effects of ASC-CM may be beneficial in the therapy for Parkinson's disease and other neurodegenerative diseases.
Insights
Cell-free conditioned media from adipose stromal cells (ASCs) protect neurons from 6-hydroxydopamine (6-OHDA) toxicity. This neuroprotection involves inhibiting reactive oxygen species (ROS) and may benefit Parkinson's disease therapy.
Area of Science:
- Neuroscience
- Cell Biology
- Regenerative Medicine
Background:
- Adipose stromal cells (ASCs) show promise in protecting against 6-hydroxydopamine (6-OHDA) induced neurotoxicity in vivo.
- The underlying molecular mechanisms of ASC-mediated neuroprotection are not fully understood.
- Released factors from ASCs are hypothesized to mediate neuroprotection.
Purpose of the Study:
- To investigate the neuroprotective effects of cell-free conditioned media from ASCs (ASC-CM) against 6-OHDA neurotoxicity.
- To elucidate the mechanisms by which ASC-CM protects neurons, specifically focusing on reactive oxygen species (ROS).
- To assess the potential therapeutic applications of ASC-CM for neurodegenerative diseases.
Main Methods:
- Primary cultures of rat rostral mesencephalic neurons (RMN) and cerebellar granule neurons (CGN) were utilized.
- Neurons were exposed to 6-OHDA to induce neurotoxicity and ROS generation.
- ASC-CM was applied as a pretreatment to evaluate its protective effects against 6-OHDA and hydrogen peroxide (H2O2)-induced cell death.
Main Results:
- ASC-CM significantly protected both RMN and CGN from 6-OHDA-induced neurotoxicity.
- ASC-CM pretreatment markedly reduced 6-OHDA-induced ROS generation in neurons.
- ASC-CM demonstrated direct neuroprotective effects by attenuating H2O2-induced neuronal death.
Conclusions:
- ASC-CM possesses both antioxidative and direct neuroprotective properties against 6-OHDA-induced neuronal damage.
- The findings suggest that ASC-CM inhibits 6-OHDA-induced ROS generation and mitigates ROS-mediated neurotoxicity.
- ASC-CM holds potential as a cell-free therapeutic strategy for Parkinson's disease and other neurodegenerative conditions.
