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Regional differences in circadian period within the suprachiasmatic nucleus
Timekeeping differences in parts of the brain's internal clock system
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Abstract
The rostral and caudal parts of the suprachiasmatic nucleus (SCN) exhibited shorter periods of circadian rhythms in arginine vasopressin (AVP) release compared to the central SCN.
- The SCN contains multiple single-cell oscillators that drive circadian rhythms.
- Isolated SCN tissue demonstrates clear circadian oscillation in AVP release in organotypic slice cultures.
- The correlation between the period of circadian rhythms and rostral-caudal coordination was examined by separately culturing the rostral, central, and caudal SCN.
- Shorter periods in AVP release were observed in regions of the SCN that contain AVP, while longer periods were associated with areas containing vasoactive intestinal polypeptide (VIP).
- Application of VIP antagonists in VIP-immunoreactive slices was linked to shortened periods of the AVP-releasing rhythm.
- These findings suggest that AVP cell oscillators may have short periods and are coordinated by VIP cells.
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