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The effect of prolactin and ACTH on the sodium metabolism of Fundulus kansae held in deionized water, sodium-enriched freshwater, and concentrated sea water

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Summary

  1. 1.

    Injections of prolactin or ACTH both caused sodium retention in intact F. kansae transferred into distilled-deionized water. The response to prolactin was more pronounced and more prolonged.

  2. 2.

    Prolactin treatment caused a significant elevation of plasma sodium levels of hypophysectomized animals held in tap water or sodium-enriched tap water.

  3. 3.

    Prolactin stimulates sodium influx in dilute saline without affecting sodium efflux. ACTH stimulates both components of sodium flux.

  4. 4.

    Hypophysectomy reduces sodium turnover of animals held in 127% sea water. ACTH stimulates sodium turnover and causes a net reduction of total-body sodium levels. Prolactin further reduces sodium turnover and causes a marked elevation of total-body sodium.

  5. 5.

    Prolactin stimulates the interrenal of hypophysectomized animals held in fresh water.

  6. 6.

    The diameter of the interrenal nuclei is significantly less in animals adapted to 127% sea water. Both prolactin and ACTH stimulate the interrenal under such conditions.

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References

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Authors and Affiliations

  1. Division of Biological Sciences, University of Missouri, 65201, Columbia, Mo.

    Warren R. Fleming & J. N. Ball

  2. Zoology Department, University of Sheffield, England

    Warren R. Fleming & J. N. Ball

Authors
  1. Warren R. Fleming
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  2. J. N. Ball
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Additional information

Supported in part by National Science Foundation Grants GB 7200 and GB 23798 and by Biomedical Support Grant Fr-07053 from the General Research Support Branch, Division of Research Resources, Bureau of Health Professions Education and Manpower Training, National Institutes of Health.

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Fleming, W.R., Ball, J.N. The effect of prolactin and ACTH on the sodium metabolism of Fundulus kansae held in deionized water, sodium-enriched freshwater, and concentrated sea water. Z. Vergl. Physiol. 76, 125–134 (1972). https://doi.org/10.1007/BF00455957

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  • DOI: https://doi.org/10.1007/BF00455957

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