Front Immunol. 2016 May 19;7:189. doi: 10.3389/fimmu.2016.00189. eCollection 2016.
Imaging Axonal Degeneration and Repair in Preclinical Animal Models of Multiple Sclerosis.
Frontiers in immunology
Soumya S Yandamuri, Thomas E Lane
Affiliations
Affiliations
- Department of Bioengineering, University of Utah , Salt Lake City, UT , USA.
- Department of Bioengineering, University of Utah, Salt Lake City, UT, USA; Department of Pathology, School of Medicine, University of Utah, Salt Lake City, UT, USA.
PMID: 27242796
PMCID: PMC4871863 DOI: 10.3389/fimmu.2016.00189
Abstract
Multiple sclerosis (MS) is a central nervous system (CNS) disease characterized by chronic neuroinflammation, demyelination, and axonal damage. Infiltration of activated lymphocytes and myeloid cells are thought to be primarily responsible for white matter damage and axonopathy. Over time, this neurologic damage manifests clinically as debilitating motor and cognitive symptoms. Existing MS therapies focus on symptom relief and delay of disease progression through reduction of neuroinflammation. However, long-term strategies to remyelinate, protect, or regenerate axons have remained elusive, posing a challenge to treating progressive forms of MS. Preclinical mouse models and techniques, such as immunohistochemistry, flow cytometry, and genomic and proteomic analysis have provided advances in our understanding of discrete time-points of pathology following disease induction. More recently, in vivo and in situ two-photon (2P) microscopy has made it possible to visualize continuous real-time cellular behavior and structural changes occurring within the CNS during neuropathology. Research utilizing 2P imaging to study axonopathy in neuroinflammatory demyelinating disease has focused on five areas: (1) axonal morphologic changes, (2) organelle transport and health, (3) relationship to inflammation, (4) neuronal excitotoxicity, and (5) regenerative therapies. 2P imaging may also be used to identify novel therapeutic targets via identification and clarification of dynamic cellular and molecular mechanisms of axonal regeneration and remyelination. Here, we review tools that have made 2P accessible for imaging neuropathologies and advances in our understanding of axonal degeneration and repair in preclinical models of demyelinating diseases.
Keywords: animal models; axonal damage; multiple sclerosis; remyelination; two-photon microscopy
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