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Complement C1qB and C4 mRNAs responses to lesioning in rat brain
G M Pasinetti1, S A Johnson, I Rozovsky
1Division of Neurogerontology, Ethel Percy Andrus Gerontology Center, University of Southern California, Los Angeles 90089-0191.
Experimental Neurology
|November 1, 1992
Summary
Rat brain cells, including microglia-macrophages, increase complement component (C) mRNAs after injury. These findings offer models for studying neurodegenerative diseases like Alzheimer's.
Area of Science:
- Neuroscience
- Immunology
- Molecular Biology
Background:
- The complement system plays a role in brain inflammation and injury.
- Complement component (C) gene expression in the adult brain is not fully understood.
- Understanding C responses to neuronal injury is crucial for neurodegenerative disease research.
Purpose of the Study:
- To investigate the presence and regulation of complement component mRNAs in the adult rat brain.
- To examine the response of C mRNAs to experimental neuronal injury models.
Main Methods:
- Adult rat brain tissue subjected to cortical deafferentation and kainic acid lesions.
- Quantitative analysis of C1qB, C4, and SGP-2 mRNAs using Northern blot and in situ hybridization.
- Immunohistochemistry to identify cell types expressing C1qB mRNA, using CR3 as a marker for microglia-macrophages.
Main Results:
- Cortical deafferentation led to increased striatal C1qB and C4 mRNAs, correlating with fiber degeneration.
- C1qB mRNA was localized to CR3-immunoreactive microglia-macrophages in lesioned striatum.
- Kainic acid lesions in hippocampus and other brain regions also increased C1qB mRNA.
- SGP-2 mRNA, a C inhibitor, showed parallel changes to C1qB mRNA.
Conclusions:
- Microglia-macrophages and potentially other brain cells rapidly up-regulate complement component mRNAs following deafferentation and neuronal injury.
- These experimental models are valuable for studying complement system involvement in Alzheimer's disease and other chronic neurodegenerative conditions.