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Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Age-related nigral downregulation of the Parkinson's risk factor FAM49B primes human microglia for inflammaging
Jacqueline Martin1,2, Guan-Ju Lai1,2,3, Christopher Y Park4
1Department of Neurobiology and Behavior, Stony Brook University, Stony Brook, NY, USA.
Abstract:
Parkinson's Disease (PD) is characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta (SNpc), which is associated with changes in microglia function. While age remains the biggest risk factor, the underlying molecular cause of PD onset and its concurrent neuroinflammation are not well understood. Many identified PD risk genes have been directly linked to dopamine neuron impairment, while others are linked to immune cell function. In this study, we found that the PD risk gene FAM49B is critically expressed in microglia of the human SNpc and is downregulated with age and PD. We utilized human and murine microglia cells to demonstrate the role of FAM49B in regulating fundamental microglial functions such as cytoskeletal maintenance, migration, surface adherence, energy homeostasis, autophagy, and, importantly, inflammatory response. Downregulation of microglial FAM49B, as observed in the SNpc of aging individuals, led to significant alterations in these cellular functions, which are associated with increased microglial activation. Thus, our study highlights novel cell-type-specific roles of FAM49B and provides a potential mechanism for susceptibility to neuroinflammation, and reactive gliosis observed in both PD and normal aging.
Insights
The Parkinson's Disease (PD) risk gene FAM49B is crucial for microglial function and is downregulated with age and PD. Its loss impairs cellular functions, increasing neuroinflammation and susceptibility to PD.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Parkinson's Disease (PD) involves dopaminergic neuron loss in the substantia nigra pars compacta (SNpc).
- Neuroinflammation and microglial dysfunction are implicated in PD pathogenesis.
- The role of specific genes, like FAM49B, in microglial function and PD risk is not fully understood.
Purpose of the Study:
- To investigate the role of the Parkinson's Disease risk gene FAM49B in microglial function.
- To determine how FAM49B expression changes with age and in PD.
- To elucidate the mechanism by which FAM49B influences neuroinflammation.
Main Methods:
- Utilized human and murine microglia cell models.
- Assessed FAM49B expression in human SNpc tissue from aging and PD individuals.
- Analyzed the impact of FAM49B downregulation on microglial functions including cytoskeletal maintenance, migration, energy homeostasis, and inflammatory response.
Main Results:
- FAM49B is critically expressed in human SNpc microglia and downregulated with age and PD.
- FAM49B regulates essential microglial functions: cytoskeletal integrity, migration, adherence, energy metabolism, and autophagy.
- Downregulation of FAM49B leads to altered microglial functions and increased activation, contributing to neuroinflammation.
Conclusions:
- FAM49B plays a novel, cell-type-specific role in microglial function.
- Reduced FAM49B expression presents a potential mechanism for age- and PD-associated neuroinflammation and reactive gliosis.
- FAM49B emerges as a potential therapeutic target for mitigating neuroinflammation in Parkinson's Disease and aging.
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