Journal of Comparative Physiology B

, Volume 154, Issue 6, pp 545–548 | Cite as

Environmental temperature modulates the rate of synthesis of egg-laying hormone inAplysia

  • Robert W. Berry


Synthesis of egg-laying hormone by the neuroendocrine bag cells ofAplysia californica is approximately twofold higher in summer than in winter. To determine whether this seasonal variation in peptide synthesis is triggered by seasonal variations in ocean temperature, animals were obtained at various times of the year and held for prolonged periods at either 15 or 20°C prior to measuring hormone synthesis. Rates of synthesis in winter animals held at 20°C began to increase after two weeks, reaching a level twice that of 15°C animals by six weeks. Cooling to 15°C blocked the rise in hormone synthesis that normally occurs between May and June and reduced synthesis in summer animals to values typical of winter. It is concluded that the seasonal modulation of neurohormone synthesis is due to changes in environmental temperature.


Peptide Seasonal Variation Human Physiology Environmental Temperature Peptide Synthesis 
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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Robert W. Berry
    • 1
  1. 1.Department of Cell Biology and AnatomyNorthwestern University School of MedicineChicagoUSA

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