Related Experiment Video
Updated: Jan 22, 2026
Author Spotlight: Establishing a New Fluorescence-Based Protocol for In Vivo Mitochondrial Morphology Analysis in Parkinson's Disease
Published on: June 23, 2023
SIRPα deficiency accelerates the pathologic process in models of Parkinson disease
Jin Wang1, Xin Ding1, Xiangyu Wu1
1State Key Laboratory of Pharmaceutical Biotechnology, Nanjing Advanced Institute for Life Sciences (NAILS), School of Life Sciences, Nanjing University, Nanjing, China.
Abstract:
Microglia-mediated neuroinflammation is a crucial pathophysiological contributor to several aging-related neurodegenerative disorders, including Parkinson's disease (PD). During the process of aging or stress, microglia undergoes several transcriptional and morphological changes that contribute to aberrant immunological responses, which is known as priming. Key molecules involved in the process, however, are not clearly defined. In the present study, we have demonstrated that level of microglial signal regulatory protein α (SIRPα) decreased during aging or inflammatory challenge. Functional studies suggested that downregulation of SIRPα released the brake of inflammatory response in microglia, revealing an inhibitory effect of SIRPα in microglial activation. Furthermore, we assessed the impact of SIRPα downregulation in PD pathogenesis using both cell culture and animal models. Our results showed that SIRPα deficiency resulted in abnormal inflammatory response and phagocytic activity of microglia, which in turn, further accelerated degeneration of dopaminergic neurons in 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine or lipopolysaccharides mice models. These results collectively demonstrate that dysregulation of SIRPα signaling in microglia during aging plays a critical role in the pathogenesis of age-related neurological disorders such as PD.
Insights
Signal regulatory protein α (SIRPα) normally inhibits microglial activation. Its downregulation during aging accelerates neuroinflammation and dopaminergic neuron degeneration, worsening Parkinson's disease pathogenesis.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia-driven neuroinflammation is central to aging-related neurodegenerative diseases like Parkinson's disease (PD).
- Microglial priming during aging or stress leads to altered immune responses, but key molecular regulators remain unclear.
- Signal regulatory protein α (SIRPα) is a potential regulator of microglial function.
Purpose of the Study:
- To investigate the role of SIRPα in microglial activation and its impact on Parkinson's disease pathogenesis.
- To determine how aging or inflammatory challenges affect SIRPα levels in microglia.
- To elucidate the functional consequences of SIRPα downregulation in neuroinflammation and neurodegeneration.
Main Methods:
- Assessed SIRPα expression levels in microglia during aging and inflammatory conditions.
- Conducted functional studies to evaluate the effect of SIRPα downregulation on microglial inflammatory responses.
- Utilized cell culture and animal models (1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine and lipopolysaccharides) to study SIRPα deficiency in PD pathogenesis.
Main Results:
- SIRPα levels were found to decrease in microglia during aging and following inflammatory challenges.
- Downregulation of SIRPα was shown to disinhibit microglial inflammatory responses, indicating an inhibitory role for SIRPα.
- SIRPα deficiency exacerbated neuroinflammation and phagocytic dysfunction in microglia, leading to accelerated dopaminergic neuron degeneration in PD models.
Conclusions:
- Dysregulation of SIRPα signaling in microglia is a critical factor in the pathogenesis of aging-related neurological disorders, including Parkinson's disease.
- SIRPα acts as a crucial brake on microglial activation, and its decline during aging contributes to disease progression.
- Targeting SIRPα signaling may offer a therapeutic strategy for mitigating neuroinflammation and neurodegeneration in PD and other aging-related disorders.
Related Concept Videos
01:24Parkinson's Disease: Treatment
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of...
01:15Parkinson's Disease: Overview
01:17Accelerators
The effectiveness of calcium chloride can...
01:14Steps in the Modeling Process
Attention is the first necessary component for observational learning. It involves focusing on what the model is doing and saying. For example, if you decide to take a drawing class to enhance your skills, you need to pay close attention to the instructor's words and hand movements. The characteristics of the model significantly...
01:17Accelerating Fluids
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
01:16Instantaneous Acceleration