Immersion as a method of thyroxine administration in amphibian metamorphosis studies

Kollros, Jerry J.

doi:10.1016/0012-1606(63)90102-7

Cited by 9 publications

(1 citation statement)

References 11 publications

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“…The phenomenon of tail involution and hence skin loss in anuran larvae (see Fox, 1972a, c, which include numerous references), under the influence of thyroid hormones. triiodothyronine, thyroxine and thyroxine analogs either in vivo or 217 in vitro (Kollros, 1961(Kollros, , 1963Bennett & Frieden, 1962;Weber, 1962Weber, , 1969Shaffer, 1963;Etkin, 1964Etkin, , 1970Fox & Turner, 1967;Kaltenbach, 1968;Frieden &Just, 1970;Hickey, 1971), and the periodic regular cornification* and sloughing of skin of adult urodeles and anurans (Parakkal & Matoltsy, 1964;Farquhar & Palade, 1965;Pflugfelder & Schubert, 1965;Spearman, 1968;Lavker, 1972) are well known. Sloughing in adults is prevented by hypophysectomy, which results in the piling up of newly formed cornified cells (Lodi & Bani, 1971).…”

Section: Introductionmentioning

confidence: 99%

The epidermis and its degeneration in the larval tail and adult body of Rana temporaria and Xenopus laevis (Amphibia: Anura)

Fox

1974

Journal of Zoology

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The tail epidermis of the larva and the body epidermis of adults of Rana temporaria and Xenopus laevis are described in terms of electron microscopy. The activity of lysosomes (determined by the localization of acid phosphatase) in relation to autolysis and the process of cellular cornification, is considered during the periods of climactic disappearance of the larval tail and skin sloughing of adults. The results obtained generally correspond for both genera. Larval tail epidermal cells completely disappear at metamorphic climax; those of the adult, which are shed, are replaced throughout life after each periodic sloughing. Nevertheless the mechanisms of their epidermal cell loss are comparable, though the level of lysosomal activity in larval tail epidermal cells is higher than in the adult body epidermis. This higher activity of lysosomal enzymes may facilitate the heavy necrosis which ensues in the larval tail at metamorphic climax.

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Section: Introductionmentioning

confidence: 99%

The epidermis and its degeneration in the larval tail and adult body of Rana temporaria and Xenopus laevis (Amphibia: Anura)

Fox

1974

Journal of Zoology

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Das Experiment: Beeinflussung der Kaulquappenentwicklung durch Hormone

Sander

1974

Biologie in unserer Zeit

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Effects of temperature on shortening of isolated Rana pipiens tadpole tail tips

Fry

1972

J. Exp. Zool.

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To determine how temperature influences the rate of amphibian metamorphosis when acting directly on peripheral tissues, Rana pipiens tail tips from larval stages 11-IV were cultured in the presence of 1 X 10-6 M or 1 X lo-' M DL-thyroxine at four different temperatures: 5"C, 10°C, 20"C, and 26" C. Five experiments were performed with variations in temperature, length of exposure to, and concentration of, hormone.Results indicate a positive correlation between temperature and rate of tail shortening in uitro, thus demonstrating that temperature can influence metamorphosis by acting on the periphery directly in addition to its effect on the hypothalamus-pituitary-thyroid axis. Low temperatures retard or inhibit shortening of isolated tails both by decreasing thyroxine uptake and by influencing its action after it is within the tail. Length of exposure to hormone and concentration also affect the rate of resorption.

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Immersion as a method of thyroxine administration in amphibian metamorphosis studies

Cited by 9 publications

References 11 publications

The epidermis and its degeneration in the larval tail and adult body of Rana temporaria and Xenopus laevis (Amphibia: Anura)

The epidermis and its degeneration in the larval tail and adult body of Rana temporaria and Xenopus laevis (Amphibia: Anura)

Das Experiment: Beeinflussung der Kaulquappenentwicklung durch Hormone

Effects of temperature on shortening of isolated Rana pipiens tadpole tail tips

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