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Acta Physiologica 2011; Volume 203, Supplement 688
The 62nd National Congress of the Italian Physiological Society
9/25/2011-9/27/2011
Sorrento, Italy
EFFECTS OF AMBIENT TEMPERATURE ON CARDIOVASCULAR CONTROL DURING SLEEP IN NARCOLEPTIC MICE WITH GENETIC ABLATION OF HYPOCRETIN NEURONS
Abstract number: P147
LO MARTIRE1 V, BASTIANINI1 S, BERTEOTTI1 C, SILVANI1 A, ZOCCOLI1 G
1Dept Human and General Physiology, Bologna Univ., Bologna, Italy
Hypothalamic neurons releasing hypocretin (HCRT) control wake-sleep behavior, cardiovascular system and body temperature and their loss entails narcolepsy. We investigated whether HCRT neurons mediate sleep-dependent cardiovascular adaptations to changes in ambient temperature (Ta). Narcoleptic mice with genetic ablation of HCRT neurons (n=11) and wild-type controls (n=12) were implanted with a telemetric blood pressure transducer and electrodes to discriminate wake-sleep behavior. Recordings were performed in each mouse at ambient temperatures of 25°C (acclimation temperature), 30°C, and 20°C in random order. Mean blood pressure (MBP) and heart rate (HR) were computed in each wake-sleep behavior and analyzed with 3-way analysis of variance and t-tests (significance at P < 0.05). Results revealed a significant interaction between the wake-sleep behavior and Ta on MBP and HR in both mouse strains, with MBP and HR rising at 20 °C, particularly during wakefulness and non-rapid-eye-movement sleep. No effect involving the mouse strain was statistically significant. These results demonstrate that hypothalamic HCRT neurons are not necessary for sleep-dependent cardiovascular adaptations to changes in Ta.
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Acta Physiologica 2011; Volume 203, Supplement 688 :P147