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Identification of a unique apolipoprotein E allele in Microcebus murinus; ApoE brain distribution and co-localization
A Calenda1, V Jallageas, S Silhol
1CNRS UPR9008, INSERM U249, Institut de Biologie, Boulevard Henri IV, Montpellier cedex, 34060, France.
Abstract:
This report is devoted to the characterization of the apolipoprotein E (ApoE) in Microcebus murinus. Only one allele homologous to the human ApoE4 allele was evidenced. The distribution of the corresponding ApoE protein in the brain was found in association with the pathological proteins characteristic of Alzheimer's disease (AD). Immunocytochemistry revealed brain deposits of ApoE in: (1) the cortical amyloid plaques; (2) the neurones of the various cortical lobes, the hippocampus and the brainstem; (3) the glial cells, astrocytes of the cortical parenchym and oligodendrocytes of the corpus callosum; and (4) the vessel walls. Most ApoE, beta-amyloid protein, abnormally phosphorylated Tau proteins and gliofilament acid proteins were seen in the same cortical areas. These findings for ApoE report the view that Microcebus murinus, in captivity, presents a pathological profile very similar to that observed in AD.
Insights
The study found apolipoprotein E (ApoE) in Microcebus murinus brain deposits, similar to Alzheimer's disease (AD) pathology. This lemur model shows promise for studying AD mechanisms and potential therapies.
Area of Science:
- Neuroscience
- Genetics
- Pathology
Background:
- Apolipoprotein E (ApoE) plays a critical role in lipid transport and is implicated in Alzheimer's disease (AD) pathogenesis.
- Microcebus murinus (mouse lemur) is a potential non-human primate model for studying human neurological disorders.
- Understanding ApoE's role in Microcebus murinus can provide insights into AD mechanisms.
Purpose of the Study:
- To characterize apolipoprotein E (ApoE) in Microcebus murinus.
- To investigate the distribution of ApoE in the brain of Microcebus murinus.
- To assess the association of ApoE with Alzheimer's disease (AD) pathological markers in this species.
Main Methods:
- Characterization of apolipoprotein E (ApoE) alleles in Microcebus murinus.
- Immunocytochemistry to detect ApoE protein distribution in brain tissue.
- Co-localization studies of ApoE with beta-amyloid, phosphorylated Tau, and glial fibrillary acidic protein.
Main Results:
- A single allele homologous to the human ApoE4 allele was identified in Microcebus murinus.
- ApoE protein deposits were found in cortical amyloid plaques, neurons, glial cells (astrocytes and oligodendrocytes), and vessel walls.
- Significant co-localization of ApoE with beta-amyloid, phosphorylated Tau, and glial fibrillary acidic protein was observed in cortical areas.
Conclusions:
- Microcebus murinus exhibits an ApoE profile and brain pathology that closely resembles human Alzheimer's disease (AD).
- The presence of ApoE in association with AD hallmarks suggests this species is a valuable model for AD research.
- Further investigation in this lemur model could elucidate AD pathogenesis and therapeutic strategies.