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Subacute skeletal myopathy induced by 2,4‐dichlorophenoxyacetate in rats and guinea pigs
Author(s) -
Da Jak M.,
Karpati George,
Carpenter Stirling
Publication year - 1978
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.880010202
Subject(s) - myofilament , myofibril , biceps , endoplasmic reticulum , lipid droplet , sarcomere , chemistry , sarcoplasm , cytoplasm , myopathy , anatomy , necrosis , microbiology and biotechnology , endocrinology , biology , medicine , myocyte
Rats and guinea pigs were injected with 2,4‐dichlorophenoxyacetate (2,4‐D) in amounts sufficient to keep them myotonic for over 12 hr daily. The biceps brachii muscles were studied by histochemistry, epoxy resin histology, and electron microscopy after one to five days. Changes observed include proliferation of the longitudinal component of the sarcoplasmic reticulum, production of new myofilaments on the periphery of cells and in nuclei, activation of satellite cells, accumulation of lipid droplets, myofibrillar damage with Z‐disc streaming, necrosis, and regeneration. The action mechanisms of 2,4‐D are not well understood. Some of the phenomena observed could be classified as proliferative and may be analogous to the auxin action of 2,4‐D in plants. The production of intranuclear filaments is probably related to the diffusion of newly formed cytoplasmic proteins into nuclei.