Summary
Previous studies aimed at elucidating day/night changes of pineal gland size and pinealocyte nuclear volume have yielded contradictory results. The aim of the present investigation was to examine the above parameters over a period of 10 successive days, at 6-hour intervals under a lighting regimen of LD 12∶12 (7 a.m. to 7 p.m.). It was found that changes in pineal gland volume could not be correlated with the light/dark phases; instead, a rhythm with a two-day period was encountered. Pinealocyte nuclear volume, by contrast, showed clear circadian changes, exhibiting troughs during photophase and peaks during scotophase.
In this experimental series, the karyometric results conformed to the melatonin forming rhythm in the rat pineal gland as reported in the literature.
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Dedicated to Professor Dr. Dr. h. c. Hermann Voss, Hamburg, on the occasion of his 90th birthday.
Supported by the Deutsche Forschungsgemeinschaft within the Schwerpunktprogramm Neuroendokrinologie (grant Vo 135/6–7)
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Diehl, B.J.M., Heidbüchel, U., Welker, H.A. et al. Day/night changes of pineal gland volume and pinealocyte nuclear size assessed over 10 consecutive days. J. Neural Transmission 60, 19–29 (1984). https://doi.org/10.1007/BF01254762
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DOI: https://doi.org/10.1007/BF01254762