Abstract：
:Mucopolysaccharidosis IIIB (MPSIIIB) is a lysosomal storage disease characterised by progressive central nervous system degeneration in patients, with death usually in the late teens. Serious behavioural problems have been reported in children at the early stages of the disease, such as hyperactivity and severe sleep disturbances, which suggest alterations in circadian rhythms. We investigated the circadian rhythm of locomotor activity of young and old MPSIIIB mice, under a 24-h light-dark (LD) cycle and under constant darkness (DD), and also examined neuropeptide expression in the suprachiasmatic nucleus (SCN), site of the principal biological pacemaker. We show that MPSIIIB mice have higher activity levels during the light (resting) phase of the LD cycle, together with weaker circadian rhythms, and a longer active phase due to a late peak of activity, in both LD and DD. In addition, young MPSIIIB mice showed shorter phase delays in response to a light pulse in DD. Increased lysosomal storage, neuroinflammation and changes in the expression of Arginine Vasopressin and Vasointestinal Polypeptide, two circadian neuropeptides, were observed in the SCN, which may be in part responsible for the changes in circadian behaviour observed in MPSIIIB mice. These findings suggest an alteration of the circadian system in MPSIIIB mice, and may inform better clinical management of circadian, sleep and behavioural disturbances in patients with MPSIII.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Canal MM,Wilkinson FL,Cooper JD,Wraith JE,Wynn R,Bigger BWdoi
10.1016/j.bbr.2010.01.045subject
Has Abstractpub_date
2010-06-19 00:00:00pages
212-20issue
2eissn
0166-4328issn
1872-7549pii
S0166-4328(10)00078-1journal_volume
209pub_type
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