Die Wirkung von Säuger-Prolactin auf die Schilddrüse des Segelflossers Pterophyllum scalare (Cichlidae, Teleostei)

  • Thekla Osewold
  • Kurt Fiedler
Article

Zusammenfassung

Die Schilddrüse von Pterophyllum scalare erscheint während des ganzen Jahres histologisch inaktiv, doch wird sie durch Injektionen von thyreotropem Hormon (TSH) je nach Dosis und Zeit stimuliert. Versuche mit radioaktiv markiertem Jod sprechen dafür, daß die intrathyreoidalen Enzymsysteme verschieden stark angeregt werden. Säuger-Prolactin aktiviert die Schilddrüse sowohl des Segelflossers als auch des Aales möglicherweise wie ein “releasing factor” für Thyreotropin. TSH- und LtH-behandelte Fische zeigen ähnliche Wirkungen. Eine einmalige Dosis von 0,5 [μg/g KG Reserpin aktiviert sowohl das Schilddrüsengewebe als auch die Jodaufnahme, während die Jodausschüttung vorübergehend gehemmt ist.

The influence of mammalian prolactin on the thyroid of the fish Pterophyllum scalare

Summary

During the whole year the thyroid gland of Pterophyllum scalare seems to be histologically inactive. Injections of thyreotropic hormone (TSH) however stimulate it depending on time and dosage. Experiments with radioactive labelled iodine suggested that the enzyme systems of the thyroid gland might be stimulated to different degrees. Mammalian prolactin (LtH) activates the thyroid of Pterophyllum and that of the eel as well, possibly as a kind of “releasing factor” for TSH. Hormone treated fish appear to show similar effects after administration of TSH and LtH too. A single injection of reserpine (0.5 (μg/gbw) causes a slight histological activation of the thyroid gland as well as the accumulation of iodine, whereas the iodine depletion is to be temporarily blocked.

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Copyright information

© Springer-Verlag 1968

Authors and Affiliations

  • Thekla Osewold
    • 1
  • Kurt Fiedler
    • 1
  1. 1.Zoologisches Institut der Universität Frankfurt a. MDeutschland

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