Acute quadriplegic myopathy: analysis of myosin isoforms and evidence for calpain-mediated proteolysis.

Abstract:

:Immunocytochemical analysis of muscle specimens from 5 patients with acute quadriplegic myopathy indictes that depletion of either fast or slow myosin occurs in this disorder. The initial lesion consists of focal myosin loss in nonatrophic fibers. Other structural proteins (actin, titin, nebulin) are spared or affected only at an advanced stage of the disease. Attempts at regeneration, evidenced by expression of fetal myosin and desmin, occur in some fibers. Calpain expression is markedly enhanced in the affected fibers, implicating an altered calcium homeostasis in the evolution of the pathologic process. By contrast, cathepsin B and ubiquitin expressions are only minimally affected. The history of 1 of our patients indicates that severe systemic illness in and of itself can cause acute quadriplegic myopathy.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Showalter CJ,Engel AG

doi

10.1002/(SICI)1097-4598(199703)20:3<316::AID-MUS8>

subject

Has Abstract

pub_date

1997-03-01 00:00:00

pages

316-22

issue

3

eissn

0148-639X

issn

1097-4598

pii

10.1002/(SICI)1097-4598(199703)20:3<316::AID-MUS8>

journal_volume

20

pub_type

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