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Updated: May 5, 2026
Primary Microglia Isolation from Mixed Glial Cell Cultures of Neonatal Rat Brain Tissue
Published on: August 15, 2012
Persistent microglial activation following neonatal CMV infection mediates neurodegeneration
Jessica L McCord1, Debotri Chatterjee2, John Y S Han3
1Department of Microbiology and Immunology, Jefferson Center for Vaccines and Pandemic Preparedness, Sidney Kimmel Medical College, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA, USA.
Abstract:
Human cytomegalovirus (HCMV) causes the most common congenital viral infection in the United States, with well-known acute and late-onset neurological pathologies. Moreover, HCMV, like multiple herpesviruses, has been associated with neuroinflammation and neurodegeneration. Using a well-established neonatal murine (M)CMV infection model, we found that early-life infection drove adult-onset neuron loss and neuropathology in the retina and brain, without evident viral reactivation. Pathology was associated with the persistence of highly activated and inflammatory damage-associated microglia. Transient depletion of these microglia before the development of pathology resulted in repopulation of the tissue by microglia with a more reparative profile, which was then sustained over time. Transient microglia depletion alone was sufficient to preserve retinal structure and photoreceptor neurons, promote healing of some existing retinal damage, and preserve brain neuron density in adult infected mice. Thus, early-life infection by MCMV promoted dysfunctional and pathogenic microglia that drove adult-onset neurodegeneration in the eye and brain.
Insights
Early-life murine cytomegalovirus (MCMV) infection causes adult-onset neurodegeneration in the brain and retina. Targeting inflammatory microglia with transient depletion preserved neuronal structure and density.
Area of Science:
- Neuroscience
- Immunology
- Virology
Background:
- Human cytomegalovirus (HCMV) is a common congenital infection linked to neurological issues.
- Herpesviruses, including HCMV, are associated with neuroinflammation and neurodegeneration.
- Neonatal murine cytomegalovirus (MCMV) infection serves as a model for studying congenital viral impacts.
Purpose of the Study:
- To investigate the long-term neurological consequences of early-life MCMV infection in a murine model.
- To determine the role of microglia in MCMV-induced adult-onset neurodegeneration.
- To explore therapeutic potential of modulating microglial activity.
Main Methods:
- Neonatal mice were infected with MCMV.
- Adult mice were assessed for neuropathology in the retina and brain.
- Microglia were transiently depleted using pharmacological agents before pathology onset.
- Microglial phenotypes and tissue structure were analyzed post-depletion.
Main Results:
- Early-life MCMV infection led to adult-onset neuron loss and neuropathology in the retina and brain.
- Persistent, highly activated, inflammatory microglia were associated with pathology.
- Transient microglia depletion resulted in repopulation by reparative microglia.
- Microglia depletion alone preserved retinal structure, photoreceptor neurons, and brain neuron density.
Conclusions:
- Early-life MCMV infection induces pathogenic microglia, driving adult-onset neurodegeneration.
- Targeting and modulating microglia activity presents a potential therapeutic strategy for congenital viral-induced neurological damage.
- Microglia play a critical role in the progression and potential resolution of MCMV-associated neuropathology.
