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Acetylcholinesterase activity in the myotome of the early chick embryo

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Summary

The myotome of early chick embryos was investigated histochemically by means of the acetylcholinesterase (AChE) reaction.

Light-microscopically, at the cervical level, the myotome was first recognized and AChE activity demonstrated at stage 13 (2 day-old embryo). Subsequently, the myotome elongated ventro-laterally along the inner surface of the dermomyotome and reached the ventro-lateral end of the dermomyotome at stage 17 to 18 (3 day-old embryo). AChE activity in the myotome showed subsequent increase in intensity during the course of development. The myotome consisted mainly of AChE-positive cells displaying enzymatic activity along the nuclear membrane and within the cytoplasm. In contrast, almost all cells of the dermomyotome and the interstitial cells were AChE-negative.

Electron-microscopically, the myotome cells of the 2 day-old embryo and the cells in the dorso-medial portion of the myotome of the 3 day-old embryo were morphologically undifferentiated; AChE activity was detected in the nuclear envelope and in single short profiles of the endoplasmic reticulum (ER). On the other hand, in the 3 day-old embryo the cells in the ventro-lateral portion of the myotome showed AChE activity in the nuclear envelope, numerous profiles of the ER and some Golgi complexes. These AChE-positive cells were regarded as developing myogenic cells based on their morphological characteristics.

The present findings indicate (i) that the appearance of AChE activity in the cytoplasm is the first sign of the differentiation of myogenic cells, and (ii) that in these myogenic cells the increase in AChE activity is based on the development of the ER.

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Authors and Affiliations

  1. Department of Anatomy, Kobe University School of Medicine, Kobe, Japan

    Akinori Miki & Humio Mizoguti

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  1. Akinori Miki
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  2. Humio Mizoguti
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Miki, A., Mizoguti, H. Acetylcholinesterase activity in the myotome of the early chick embryo. Cell Tissue Res. 227, 23–40 (1982). https://doi.org/10.1007/BF00206329

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