Abstract

The suprachiasmatic nucleus (SCN) of the hypothalamus is considered to be the circadian oscillator (clock) and is entrained by the environmental light/dark cycle. The SCN influences various physiological and behavioral activities. Locomotor activity exhibit a clearly defined circadian rhythmicity. The neuroanatomical substrates subserving the circadian locomotor activity are unknown. Bilateral lesioning of the SCN renders the locomotor activity arrhythmic. Transplantation of hypothalamic tissue containing the SCN into the third ventricle restored circadian locomotor activity in SCN lesioned animals. We hypothesize that the circadian entrainment of locomotor activity by the SCN is mediated via efferent projection fibers to specific neuronal population(s) within the motor system. The proposed three year project is designed to identify the neuroanatomical substrates that communicates SCN generated circadian signals within the motor system.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Specialized Center--Cooperative Agreements (U54)
Project #
5U54NS034194-06
Application #
6396011
Study Section
Project Start
1999-09-01
Project End
2000-08-31
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
6
Fiscal Year
1999
Total Cost
Indirect Cost

  Institution

Name
Morehouse School of Medicine
Department
Type
DUNS #
City
Atlanta
State
GA
Country
United States
Zip Code
30310

  Publications

Pulliam, John V K; Xu, Zhenfeng; Ford, Gregory D et al. (2013) Computational identification of conserved transcription factor binding sites upstream of genes induced in rat brain by transient focal ischemic stroke. Brain Res 1495:76-85
Li, Yonggang; Lein, Pamela J; Liu, Cuimei et al. (2012) Neuregulin-1 is neuroprotective in a rat model of organophosphate-induced delayed neuronal injury. Toxicol Appl Pharmacol 262:194-204
Rodriguez-Mercado, Rafael; Ford, Gregory D; Xu, Zhenfeng et al. (2012) Acute neuronal injury and blood genomic profiles in a nonhuman primate model for ischemic stroke. Comp Med 62:427-38
Mong, Jessica A; Baker, Fiona C; Mahoney, Megan M et al. (2011) Sleep, rhythms, and the endocrine brain: influence of sex and gonadal hormones. J Neurosci 31:16107-16
Guo, Qingmin; Wang, Guangming; Namura, Shobu (2010) Fenofibrate improves cerebral blood flow after middle cerebral artery occlusion in mice. J Cereb Blood Flow Metab 30:70-8
Davidson, Alec J; Castanon-Cervantes, Oscar; Leise, Tanya L et al. (2009) Visualizing jet lag in the mouse suprachiasmatic nucleus and peripheral circadian timing system. Eur J Neurosci 29:171-80
Wang, Guangming; Guo, Qingmin; Hossain, Mohammed et al. (2009) Bone marrow-derived cells are the major source of MMP-9 contributing to blood-brain barrier dysfunction and infarct formation after ischemic stroke in mice. Brain Res 1294:183-92
Paul, Ketema N; Laposky, Aaron D; Turek, Fred W (2009) Reproductive hormone replacement alters sleep in mice. Neurosci Lett 463:239-43
Guo, Qingmin; Wang, Guangming; Liu, Xiaowei et al. (2009) Effects of gemfibrozil on outcome after permanent middle cerebral artery occlusion in mice. Brain Res 1279:121-30
Fukuhara, Chiaki; Tosini, Gianluca (2008) Analysis of daily and circadian gene expression in the rat pineal gland. Neurosci Res 60:192-8

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