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Updated: Jun 3, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
[Effects of β-amyloid-induced microglial inflammatory supernatant on neuronal apoptosis]
Wei Li1, Ai-qin Suo, Jie-wen Zhang
1Department of Neurology, Henan Provincial People's Hospital, Zhengzhou 450003, China. liwei71@126.com
Objective:
To study the effects of neuronal apoptosis under the induction of β-amyloid inflammatory supernatant.
Methods:
The neurons were intervened by β-amyloid-induced inflammatory supernatant at the concentration of Aβ1-42 at 125 nmol/L. And the expressions of Bcl-2, caspase-3, PARP and neuronal apoptosis were detected.
Results:
The caspase-3 (14.2 ± 1.8), Bcl-2 (10.6 ± 0.8) positive cells of microglia inflammatory supernatant stimulated group were significantly elevated than the control (2.2 ± 0.6, 5.0 ± 0.3, P < 0.01). Nuclear chromatin was uniform yellow-green fluorescent. And there was significant difference of neuronal apoptosis between microglia inflammatory supernatant group and Aβ1-42 directly stimulated group.
Conclusion:
Neuronal apoptosis is induced by caspase-3 in β-amyloid inflammatory supernatant. One of the important causes is chronic inflammatory process of activated microglia by Aβ.
Insights
Beta-amyloid inflammatory supernatant induces neuronal apoptosis via caspase-3 activation. Activated microglia contribute to this chronic inflammatory process, leading to neuron death.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Context:
- Alzheimer's disease pathogenesis involves beta-amyloid (Aβ) peptide accumulation.
- Neuroinflammation, particularly microglial activation, is a key feature of AD.
- Neuronal apoptosis is a critical mechanism of neurodegeneration in AD.
Purpose:
- To investigate the role of beta-amyloid (Aβ)-induced inflammatory supernatant on neuronal apoptosis.
- To examine the expression of apoptosis-related proteins, including Bcl-2 and caspase-3.
- To elucidate the contribution of activated microglia to Aβ-mediated neurotoxicity.
Summary:
- Exposure to Aβ1-42 inflammatory supernatant significantly increased caspase-3 and Bcl-2 positive cells in neurons compared to controls.
- The study detected significant neuronal apoptosis in response to the inflammatory supernatant.
- Neuronal apoptosis was mediated by caspase-3, highlighting the role of chronic inflammation from activated microglia in Aβ toxicity.
Impact:
- This research clarifies the molecular mechanisms underlying Aβ-induced neurodegeneration.
- Findings emphasize the therapeutic potential of targeting microglial activation and caspase-3 pathways in Alzheimer's disease.
- Provides insights into the interplay between amyloid pathology and neuroinflammation.
