Abstract
Objective: The hypocretins (orexins) (HCRT), which help regulate aspects of sleep and wakefulness, are synthesized by neurons located exclusively in the lateral hypothalamus. Hcrt-containing neurons project throughout the CNS and project especially heavily to the noradrenergic locus coeruleus (LC). Sudden infant death syndrome (SIDS) remains the principal cause of postneonatal infant death, but mechanisms underlying the syndrome have not been completely elucidated. Recently, failure to arouse from sleep has been suggested as contributing to SIDS. Therefore, we studied developmental changes in HCRT-1 and HCRT-2 in the brainstem and compared those changes between SIDS cases and controls. Methods: Twenty cases of SIDS and 21 controls, aged from 20 gestational weeks to 13 years of age, were selected. We examined the brainstems of each subject for HCRT-1 and HCRT-2 with immunohistochemistry techniques. Results: HCRT-1 appeared in the brainstem from the early fetal period. Its expression was moderately present at 6 months in the LC, dorsal raphe nucleus (DRN), and periaqueductal gray matter (PAG) and then gradually increased during development. HCRT-2 was detected from the neonatal period in the medulla oblongata and LC and from the early fetal period in the DRN and PAG, respectively. Its expression gradually increased from 6 months in the LC, DRN, and PAG. We found intense expression of HCRT-1 in the LC in the SIDS victims earlier than in the controls. No definitive developmental changes emerged in immunoreactivity of HCRT-2 between SIDS cases and controls in the brainstem. Conclusions. This study revealed developmental alterations in HCRT-1, a peptide related to arousal, in the LC of SIDS victims relative to controls, suggesting that the hypothalamic-pontine hypocretinergic system is involved in the pathophysiology of SIDS.
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- CNS:
-
Central nervous system
- CSF:
-
Cerebrospinal fluid
- DRN:
-
Dorsal raphe nucleus
- HCRT:
-
Hypocretin
- LC:
-
Locus coeruleus
- LDT:
-
Laterodorsal tegmental nucleus
- REM:
-
Rapid eye movements
- SIDS:
-
Sudden infant death syndrome
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This study was supported by grants from the Ministry of Health, Labor and Welfare of Japan.
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Ozawa, Y., Takashima, S., Nonaka, H., Uga, N. (2014). Developmental Alteration of Hypocretins (Orexins) in the Brainstem in the Sudden Infant Death Syndrome. In: Sawaguchi, T. (eds) Sudden Infant Death Syndrome. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54315-2_2
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DOI: https://doi.org/10.1007/978-4-431-54315-2_2
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