Autolysis and heterolysis of the epidermal cells in anuran tadpole tail regression

1985 ◽  
Vol 185 (2) ◽  
pp. 269-275 ◽  
Author(s):  
Tsutomu Kinoshita ◽  
Fumie Sasaki ◽  
Kyozo Watanabe
Keyword(s):  
Epidermal Cells ◽  
Tadpole Tail ◽  
Anuran Tadpole

scholarly journals An Electron-Microscope Study of Cell Deletion in the Anuran Tadpole Tail During Spontaneous Metamorphosis with Special Reference to Apoptosis of Striated Muscle Fibres

1974 ◽  
Vol 14 (3) ◽  
pp. 571-585 ◽  
Author(s):  
J. F. R.KERR ◽  
B. HARMON ◽  
J. SEARLE
Keyword(s):  
Cell Death ◽  
Striated Muscle ◽  
Morphological Changes ◽  
Light And Electron Microscopy ◽  
Epidermal Cells ◽  
Similar Process ◽  
Muscle Fibres ◽  
Tadpole Tail ◽  
Anuran Tadpole ◽  
Cell Deletion

The mechanism of cell deletion responsible for involution of the anuran tadpole tail during spontaneous metamorphosis was studied by light and electron microscopy, attention being focused on epidermis and striated muscle. The earliest indication of pending dissolution of epidermal cells was found to be aggregation of condensed chromatin beneath the nuclear envelope. This is followed by breaking up of the nucleus, and cytoplasmic condensation and budding with the production of a number of compact, membrane-bounded cell fragments with relatively well preserved organelles. These are then ingested and degraded by nearby viable cells, the majority by distinctive macrophage-like cells, which are scattered throughout the epidermis, and a few by epithelial cells. The morphological changes observed in the dying epidermal cells are the same as those described both in the ‘programmed cell death’ that plays an important role in the normal development of vertebrate embryos and in the type of cell death that has been shown to be involved in regulating the size of tissues in adult mammals under normal as well as pathological conditions; it has been suggested elsewhere that apoptosis might be a suitable name for the phenomenon. Deletion of striated muscle fibres in the tadpole tail is accomplished by a process that appears to be a modification of classical apoptosis, in which dilatation and confluence of elements of the sarcoplasmic reticulum lead to internal fragmentation, the usual surface budding presumably being precluded by the large volume and specialized structure of these cells. The early and late nuclear changes, and the apparent ultrastructural integrity of organelles in the membrane-bounded muscle fragments are typical of apoptosis, and subsequent degradation within macrophages follows the standard stereotyped pattern. An essentially similar process has been described by others in the muscles of metamorphosing insect larvae, but whether striated muscle cells in adult higher vertebrates can undergo apoptosis is still uncertain.

scholarly journals Acetyl-L-carnitine suppresses thyroid hormone-induced and spontaneous anuran tadpole tail shortening

Hereditas ◽  
2013 ◽  
Vol 150 (1) ◽  
pp. 1-9
Author(s):  
Hideki Hanada ◽  
Hirotsugu Kobuchi ◽  
Masanao Yamamoto ◽  
Keiko Kashiwagi ◽  
Kenjiro Katsu ◽  
...  
Keyword(s):  
Thyroid Hormone ◽  
Tadpole Tail ◽  
Anuran Tadpole

scholarly journals Developmentally and regionally regulated participation of epidermal cells in the formation of collagen lamella of anuran tadpole skin

2000 ◽  
Vol 42 (6) ◽  
pp. 571-580 ◽  
Author(s):  
Rie Utoh ◽  
Kinji Asahina ◽  
Kenichi Suzuki ◽  
Kaori Kotani ◽  
Masanobu Obara ◽  
...  
Keyword(s):  
Epidermal Cells ◽  
Anuran Tadpole ◽  
Tadpole Skin
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