Dorsomedial SCN neuronal subpopulations subserve different functions in human dementia
Open Access
- 29 January 2008
- journal article
- research article
- Published by Oxford University Press (OUP) in Brain
- Vol. 131 (6), 1609-1617
- https://doi.org/10.1093/brain/awn049
Abstract
The suprachiasmatic nuclei (SCN) are necessary and sufficient for the maintenance of circadian rhythms in primate and other mammalian species. The human dorsomedial SCN contains populations of non-species-specific vasopressin and species-specific neurotensin neurons. We made time-series recordings of core body temperature and locomotor activity in 19 elderly, male, end-stage dementia patients and 8 normal elderly controls. Following the death of the dementia patients, neuropathological diagnostic information and tissue samples from the hypothalamus were obtained. Hypothalamic tissue was also obtained from eight normal control cases that had not had activity or core temperature recordings previously. Core temperature was analysed for parametric, circadian features, and activity was analysed for non-parametric and parametric circadian features. These indices were then correlated with the degree of degeneration seen in the SCN (glia/neuron ratio) and neuronal counts from the dorsomedial SCN (vasopressin, neurotensin). Specific loss of SCN neurotensin neurons was associated with loss of activity and temperature amplitude without increase in activity fragmentation. Loss of SCN vasopressin neurons was associated with increased activity fragmentation but not loss of amplitude. Evidence for a circadian rhythm of vasopressinergic activity was seen in the dementia cases but no evidence was seen for a circadian rhythm in neurotensinergic activity. These results provide evidence that the SCN is necessary for the maintenance of the circadian rhythm in humans, information on the role of neuronal subpopulations in subserving this function and the utility of dementia in elaborating brain–behaviour relationships in the human.This publication has 50 references indexed in Scilit:
- Outcome following surgery for temporal lobe epilepsy with hippocampal involvement in preadolescent children: emphasis on mesial temporal sclerosisJournal of Neurosurgery: Pediatrics, 2007
- Quantitative morphological assessment reveals neuronal and glial deficits in hippocampus after a brief subtoxic exposure to chlorpyrifos in neonatal ratsDevelopmental Brain Research, 2005
- Dementia severity and Lewy bodies affect circadian rhythms in Alzheimer diseaseNeurobiology of Aging, 2004
- Disrupted daily activity/rest cycles in relation to daily cortisol rhythms of home-dwelling patients with early Alzheimer's dementiaBrain, 2004
- Suprachiasmatic nucleus of the human brain: An immunocytochemical and morphometric analysisThe Anatomical Record, 1996
- Circadian locomotor activity and core-body temperature rhythms in Alzheimer's diseaseNeurobiology of Aging, 1995
- VIP neurons in the human SCN in relation to sex, age, and Alzheimer's diseaseNeurobiology of Aging, 1995
- COSIFIT: An interactive program for simultaneous multioscillator cosinor analysis of time-series dataComputers and Biomedical Research, 1990
- Circadian rhythm of firing rate recorded from single cells in the rat suprachiasmatic brain sliceBrain Research, 1982
- Loss of a circadian adrenal corticosterone rhythm following suprachiasmatic lesions in the ratBrain Research, 1972