Expression of circadian rhythmicity correlates with the number of arginine-vasopressin-immunoreactive cells in the suprachiasmatic nucleus of common voles,Microtus arvalis

Mar 7, 1994Brain research

Daily activity patterns linked to the number of specific hormone-producing cells in the internal clock area of common voles

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Abstract

A total of 20 common voles were studied for arginine-vasopressin (AVP)-immunoreactive cells in the suprachiasmatic nuclei (SCN) under different light conditions.

  • In continuous low light conditions, AVP-positive neurons were present predominantly in the dorsomedial SCN, with low staining intensity observed in all voles.
  • The number of AVP-immunoreactive cells did not differ among voles with strong, weak, or absent circadian rhythmicity under low light conditions.
  • In light-dark (LD) conditions, staining intensity of AVP-positive SCN neurons was low in rhythmic animals, high in non-rhythmic animals, and intermediate in weakly rhythmic animals.
  • A negative correlation was observed between the number of AVP-positive cells in LD conditions and the propensity of animals to lose circadian rhythmicity under low light.
  • Differences in AVP-immunoreactive cells were localized to the dorsomedial SCN, with no variations found in other areas of the SCN.

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