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Cyclosporin - a treatment attenuates delayed cytoskeletal alterations and secondary axotomy following mild axonal stretch injury

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posted on 2023-05-16, 19:24 authored by Staal, JA, Tracey DicksonTracey Dickson, Chung, RS, James VickersJames Vickers
Following central nervous system trauma, diffuse axonal injury and secondary axotomy result from a cascade of cellular alterations including cytoskeletal and mitochondrial disruption. We have examined the link between intracellular changes following mild/ moderate axonal stretch injury and secondary axotomy in rat cortical neurons cultured to relative maturity (21 days in vitro). Axon bundles were transiently stretched to a strain level between 103% and 106% using controlled pressurized fluid. Double-immunohistochemical analysis of neurofilaments, neuronal spectrin, α-internexin, cytochrome-c, and ubiquitin was conducted at 24-, 48-, 72-, and 96-h postinjury. Stretch injury resulted in delayed cytoskeletal damage, maximal at 48-h postinjury. Accumulation of cytochrome-c and ubiquitin was also evident at 48 h following injury and colocalized to axonal regions of cytoskeletal disruption. Pretreatment of cultures with cyclosporin-A, an inhibitor of calcineurin and the mitochondrial membrane transitional pore, reduced the degree of cytoskeletal damage in stretch-injured axonal bundles. At 48-h postinjury, 20% of untreated cultures demonstrated secondary axotomy, whereas cyclosporin A-treated axon bundles remained intact. By 72-h postinjury, 50% of control preparations and 7% of cyclosporin A-treated axonal bundles had progressed to secondary axotomy, respectively. Statistical analyses demonstrated a significant (p < 0.05) reduction in secondary axotomy between treated and untreated cultures. In summary, these results suggest that cyclosporin-A reduces progressive cytoskeletal damage and secondary axotomy following transient axonal stretch injury in vitro. © 2007 Wiley Periodicals, Inc.

History

Publication title

Developmental Neurobiology

Volume

67

Issue

14

Pagination

1831-1842

ISSN

1932-8451

Department/School

Menzies Institute for Medical Research

Publisher

JOHN WILEY & SONS INC,

Place of publication

United States

Repository Status

  • Restricted

Socio-economic Objectives

Clinical health not elsewhere classified

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