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Updated: Aug 23, 2026
Experimental Approaches for Biochemical Analysis of Glial Fibrillary Acidic Protein and Its Disease-associated Variants
Published on: November 28, 2025
The intermediate filament GFAP is important for the control of experimental murine Staphylococcus aureus-induced
Werner Stenzel1, Sabine Soltek, Dirk Schlüter
1Abteilung für Neuropathologie, Universität zu Köln, Köln, Germany.
Abstract:
The functional role of astrocytes exerted via their intermediate protein glial fibrillary acidic protein (GFAP) in CNS infections was studied in Staphylococcus aureus-induced brain abscess. Compared to wild type (WT) mice, GFAP(0/0) mice developed larger and more poorly demarcated inflammatory lesions paralleled by a significantly increased intracerebral bacterial load, a diffuse leukocytic infiltration of the contralateral hemisphere, purulent ventriculitis, vasculitis, and severe brain edema. These observations were correlated with the lack of a bordering function of activated astrocytes that strongly upregulated their GFAP expression in the abscess surrounding of WT mice. Clinically important, this lack of restriction of inflammation markedly aggravated the course of disease with manifestation of seizures and a severe weight loss in GFAP(0/0) mice. These data were paralleled by observations in the model of Toxoplasma encephalitis (TE) during which the intracerebral parasitic load was significantly increased. Moreover, tachyzoite-induced tissue necrosis was exclusively found in the brains of GFAP(0/0) mice in chronic TE. Collectively, these findings delineate a host defense function of astrocytes via restricting pathogenic spread and multiplication within the CNS, thereby contributing to the protection of the highly vulnerable brain parenchyma.
Insights
Glial fibrillary acidic protein (GFAP) in astrocytes is crucial for limiting CNS infections. Mice lacking GFAP showed increased bacterial and parasitic loads, severe brain inflammation, and worsened disease, highlighting astrocytes
Area of Science:
- Neuroscience
- Immunology
- Infectious Diseases
Background:
- Astrocytes, a type of glial cell in the central nervous system (CNS), play a role in brain function and response to injury.
- Glial fibrillary acidic protein (GFAP) is a key intermediate filament protein expressed by astrocytes, whose specific role in CNS infections is not fully understood.
Purpose of the Study:
- To investigate the functional role of astrocytes, specifically GFAP, in combating CNS infections.
- To determine how the absence of GFAP affects the progression and severity of bacterial (Staphylococcus aureus) and parasitic (Toxoplasma encephalitis) brain infections.
Main Methods:
- Comparison of disease progression in wild-type (WT) mice and GFAP-deficient (GFAP(0/0)) mice infected with Staphylococcus aureus to induce brain abscess.
- Assessment of lesion size, bacterial load, inflammatory cell infiltration, ventriculitis, vasculitis, and brain edema in infected mice.
- Evaluation of GFAP(0/0) mice in a model of Toxoplasma encephalitis (TE) to assess parasitic load and tissue damage.
Main Results:
- GFAP(0/0) mice exhibited larger, poorly demarcated lesions with significantly higher bacterial loads compared to WT mice in the brain abscess model.
- Absence of GFAP led to diffuse leukocytic infiltration, purulent ventriculitis, vasculitis, severe brain edema, seizures, and weight loss in infected mice.
- In Toxoplasma encephalitis, GFAP(0/0) mice showed increased parasitic load and exclusively developed tachyzoite-induced tissue necrosis.
Conclusions:
- Astrocytes, through GFAP expression, provide a crucial host defense mechanism by restricting pathogen spread and multiplication within the CNS.
- The lack of GFAP impairs the bordering function of astrocytes, leading to aggravated disease severity and increased susceptibility to CNS infections.
- These findings underscore the protective role of astrocytes and GFAP in maintaining brain parenchyma integrity during CNS infections.
