Letter | Published:

Secretion of Thyrotrophic Hormone by Pituitary Transplants in a Teleost Fish

Naturevolume 199pages618620 (1963) | Download Citation



IN mammals, extensive investigations have established the concept that normal rates of secretion of thyrotrophic hormone (TSH) depend upon stimulatory influences from the hypothalamus transmitted via the pituitary stalk, though it is admitted that very low levels of TSH-output may persist in the absence of this hypothalamic stimulation1. In amphibians, diminution or cessation of TSH-output has been reported following stalk transection2 or heterotopic pituitary transplantation3, though in some experiments the transplanted gland secreted considerable amounts of TSH2,4. The situation in teleost fishes has not previously been investigated. In this paper we shall present evidence of abundant TSH-production by the transplanted pituitary in the small viviparous cyprinodont, Mollienesia formosa (Girard).

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    Harris, G. W., in Comparative Endocrinology, edit. by Gorbman, A., 202 (Wiley, New York, 1959). Khazin, A., and Reichlin, S., Endocrinol., 68, 914 (1961).

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    Ball, J. N. (unpublished results).

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  1. Department of Zoology, Liverpool University

    • JOHN N. BALL
  2. Laboratoire de Physiologic de l'Institut Océanographique, Paris

  3. Genetics Laboratory of the New York Zoological Society, American Museum of Natural History, New York



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