New Stem Cell-Derived Model Sheds Light on APOE4 Gene’s Role in Alzheimer’s Disease
Understanding Alzheimer’s Disease
Alzheimer’s disease stands as the leading cause of dementia, with brain alterations occurring decades before any clinical signs are recognized. This progressive condition is marked by the accumulation of amyloid proteins, which contribute to neurodegeneration within the brain.
The Role of Microglia
Microglia are essential immune cells in the central nervous system, tasked with removing amyloid proteins and supporting brain development, maintenance, defense, and recovery. However, during Alzheimer’s disease, the functionality of microglia deteriorates, leaving researchers uncertain about the underlying causes of this dysfunction.
APOE4 Gene as a Genetic Risk Factor
The APOE4 gene is a well-established genetic risk factor for Alzheimer’s disease, present in microglia and linked to over half of dementia cases. This gene plays a crucial role in neuronal repair. Previous studies in mouse models indicated that APOE4 may promote inflammation, leading to neurodegeneration. Despite this, the precise role of the APOE4 gene in human microglia has remained elusive due to challenges in creating suitable models for study.
New Research Findings
A recent study by researchers from Finland and Australia has developed a novel human microglia model derived from stem cells, allowing for an examination of APOE4’s functions in Alzheimer’s disease. Their findings, published in Stem Cell Reports, demonstrate that APOE4 significantly affects microglial function by enhancing inflammation and impairing the ability of brain cells to clear harmful or damaged materials.
Implications for Alzheimer’s Treatment
The alterations in microglial functions attributed to APOE4 could disrupt the brain’s capacity to maintain a healthy balance, potentially leading to amyloid protein accumulation and the progression of Alzheimer’s disease. This research suggests a new avenue for treatment strategies focusing on enhancing microglial function rather than solely targeting amyloid protein production.
Future Research Opportunities
The stem cell-derived human microglia model established in this study offers a promising platform for exploring the molecular mechanisms of the brain in various neurological conditions, paving the way for new therapeutic targets.
References
Konttinen, H., Cabral-Da-Silva, M. E. C., Ohtonen, S., Wojciechowski, S., Shakirzyanova, A., Caligola, S., … Malm, T. (2019). PSEN1ΔE9, APPswe, and APOE4 Confer Disparate Phenotypes in Human iPSC-Derived Microglia. Stem Cell Reports. doi: 10.1016/j.stemcr.2019.08.004
Alzheimer’s disease risk gene APOE4 impairs function of brain immune cells. (2019, September 16). Retrieved from https://www.eurekalert.org/pub_releases/2019-09/uoef-adr091619.php