Microglial Drivers of Alzheimer's Disease Pathology: An Evolution of Diverse Participating States

Author:

Kuhn Madison K.1234,Proctor Elizabeth A.12345ORCID

Affiliation:

1. Department of Biomedical Engineering The Pennsylvania State University University Park Pennsylvania USA

2. Department of Neurosurgery Penn State College of Medicine Hershey Pennsylvania USA

3. Department of Pharmacology Penn State College of Medicine Hershey Pennsylvania USA

4. Center for Neural Engineering The Pennsylvania State University University Park Pennsylvania USA

5. Department of Engineering Science & Mechanics The Pennsylvania State University University Park Pennsylvania USA

Abstract

ABSTRACTMicroglia, the resident immune‐competent cells of the brain, become dysfunctional in Alzheimer's disease (AD), and their aberrant immune responses contribute to the accumulation of pathological proteins and neuronal injury. Genetic studies implicate microglia in the development of AD, prompting interest in developing immunomodulatory therapies to prevent or ameliorate disease. However, microglia take on diverse functional states in disease, playing both protective and detrimental roles in AD, which largely overlap and may shift over the disease course, complicating the identification of effective therapeutic targets. Extensive evidence gathered using transgenic mouse models supports an active role of microglia in pathology progression, though results vary and can be contradictory between different types of models and the degree of pathology at the time of study. Here, we review microglial immune signaling and responses that contribute to the accumulation and spread of pathological proteins or directly affect neuronal health. We additionally explore the use of induced pluripotent stem cell (iPSC)‐derived models to study living human microglia and how they have contributed to our knowledge of AD and may begin to fill in the gaps left by mouse models. Ultimately, mouse and iPSC‐derived models have their own limitations, and a comprehensive understanding of microglial dysfunction in AD will only be established by an integrated view across models and an appreciation for their complementary viewpoints and limitations.

Funder

National Institute on Aging

National Institute of Neurological Disorders and Stroke

Publisher

Wiley

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