The long term goals of the research program are to characterize the mechanisms which regulate the generation of neurons destined for the corpus striatum (a component of the basal ganglia of the forebrain) during normal development or under pathological conditions. Those goals will be achieved in three stages: ontogenetic variation in the magnitudes of cytokinetic parameters (variables which regulate the process of cell generation) of striatal progenitors will be quantified and the variation will be related to the variation in the rate of generation and phenotypic diversity of the progeny; based on those data, an in vitro model of striatal cytogenesis will be developed; and using that in vitro model, the mechanisms by which intrinsic or extrinsic factors influence striatal cytogenesis under physiological or pathological conditions will be characterized. The data will be critically important for analyzing the effects of products of specific genes (e.g. Huntington's disease gene) or specific biochemical substances (e.g. growth factors, neurotransmitters or neuropeptides) on striatal development especially if transgenic animal models suitable for such analyses become available. Approaches such as those described above have been employed in research on non-neural systems with remarkable success, but not in research on cell generation in the corpus striatum. Experiments of this application will be the first of the three stages mentioned above. They will estimate for every day of the striatal neurogenetic period, the average values of the cytokinetic parameters of progenitors in the ganglionic eminence (embryonic source of striatal cells) in mice; quantify the rate of cellular Output from the ganglionic eminence, and determine the time of generation of two categories of striatal neurons. The Ontogenetic variation in the values of the cytokinetic parameters will be related to the variation in the rate of cellular output and phenotypic diversity of the progeny generated at the corresponding periods. Those data will serve as critical, baseline parameters for developing the in vitro model of cell generation in the corpus striatum. The principal technique to be used in the present experiments will be labeling cells in -phase of the mitotic cycle with bromodeoxyuridine and/or tritiated thymidine and identifying the labeled cells in tissue sections from the ganglionic eminence or the corpus striatum by immunocytochemical or autoradiographic methods. The number and spatial distribution of labeled cells at different developmental periods will be analyzed to estimate the cytokinetic parameters and the rate of cellular output. Those techniques will be combined with immunocytochemistry to determine the time of generation of striatal neurons containing substance P or enkephalin, the neuronal types selectively depleted in Huntington's disease.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
First Independent Research Support & Transition (FIRST) Awards (R29)
Project #
5R29NS032657-02
Application #
2270990
Study Section
Neurology B Subcommittee 2 (NEUB)
Project Start
1994-07-01
Project End
1999-06-30
Budget Start
1995-07-01
Budget End
1996-06-30
Support Year
2
Fiscal Year
1995
Total Cost
Indirect Cost
Name
Massachusetts General Hospital
Department
Type
DUNS #
City
Boston
State
MA
Country
United States
Zip Code
02199
Mitsuhashi, T; Aoki, Y; Eksioglu, Y Z et al. (2001) Overexpression of p27Kip1 lengthens the G1 phase in a mouse model that targets inducible gene expression to central nervous system progenitor cells. Proc Natl Acad Sci U S A 98:6435-40
Katchanov, J; Harms, C; Gertz, K et al. (2001) Mild cerebral ischemia induces loss of cyclin-dependent kinase inhibitors and activation of cell cycle machinery before delayed neuronal cell death. J Neurosci 21:5045-53
Miyama, S; Takahashi, T; Goto, T et al. (2001) Continuity with ganglionic eminence modulates interkinetic nuclear migration in the neocortical pseudostratified ventricular epithelium. Exp Neurol 169:486-95
Ho, C; Zhou, J; Medina, M et al. (2000) delta-catenin is a nervous system-specific adherens junction protein which undergoes dynamic relocalization during development. J Comp Neurol 420:261-76
Verney, C; Takahashi, T; Bhide, P G et al. (2000) Independent controls for neocortical neuron production and histogenetic cell death. Dev Neurosci 22:125-38
Takahashi, T; Bhide, P G; Goto, T et al. (1999) Proliferative behavior of the murine cerebral wall in tissue culture: cell cycle kinetics and checkpoints. Exp Neurol 156:407-17
Bhide, P G; Frost, D O (1999) Intrinsic determinants of retinal axon collateralization and arborization patterns. J Comp Neurol 411:119-29
Sheth, A N; McKee, M L; Bhide, P G (1998) The sequence of formation and development of corticostriate connections in mice. Dev Neurosci 20:98-112
Delalle, I; Bhide, P G; Caviness Jr, V S et al. (1997) Temporal and spatial patterns of expression of p35, a regulatory subunit of cyclin-dependent kinase 5, in the nervous system of the mouse. J Neurocytol 26:283-96
Sheth, A N; Bhide, P G (1997) Concurrent cellular output from two proliferative populations in the early embryonic mouse corpus striatum. J Comp Neurol 383:220-30

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