Using a novel developmental approach, embryogenesis of the substantia nigra (SN) and postnatal degeneration in both the SN and striatum of the weaver mutant mouse will be studied as an animal model of human nigrostriatal degeneration and Parkinson disease. Postnatal studies will focus on cell loss in the nigrostriatal system between days 8 and 360. Long survival [3H] thymidine autoradiography will be combined with immunocytochemistry in the same tissue section. The questions to be addressed are: Do the postnatal deficits in the SN appear in a systematic order that can be linked to the time of origin of neurons and their neurochemical characteristics? Immunocytochemistry against tyrosine hydroxylase (TH), cholecystokinin (CCK), and 28-kDa calcium binding protein (CaBP) will be used to subdivide the SN population. The data will be analyzed to see which neurogenetic/neurochemical subgroups are most vulnerable and which are most resistant to the action(s) of the weaver gene. Does cell loss in the SN produce secondary cell loss in the striatum? Immunocytochemistry against gamma-aminobutyric acid, Substance P, enkephalin, choline acetyltransferase and CaBP neurons will be used to subdivide the striatal cells. The data will be analyzed to see which neurogenetic/neurochemical subsets are most resistant to SN deafferentation. Embryonic studies will focus on differences between normals and weavers to address the question: Does the SN develop normally in weaver embryos? The large dopamine (DA) population in the SN (as seen with TH immunocytochemistry) will be combined with short-survival [3H] thymidine autoradiography to differentiate SN-DA cells from other monoamine neurons in the mesencephalon. SN neurons will be characterized as to their germinal source, migratory pathway and settling patterns. Taken together, the proposed experiments in the weaver mutant will provide quantitative observations on the underlying developmental mechanisms involved in the degeneration of the nigrostriatal system.

Project Start
1995-01-01
Project End
1998-12-31
Budget Start
Budget End
Support Year
5
Fiscal Year
1995
Total Cost
Indirect Cost
Name
Indiana University-Purdue University at Indianapolis
Department
Type
DUNS #
005436803
City
Indianapolis
State
IN
Country
United States
Zip Code
46202
Marti, Joaquin; Santa-Cruz, Maria C; Molina, Vanessa et al. (2009) Regional differences in the vulnerability of substantia nigra dopaminergic neurons in weaver mice. Acta Neurobiol Exp (Wars) 69:198-206
Marti, Joaquin; Santa-Cruz, M C; Bayer, Shirley A et al. (2007) Purkinje cell age-distribution in fissures and in foliar crowns: a comparative study in the weaver cerebellum. Brain Struct Funct 212:347-57
Marti, Joaquin; Santa-Cruz, M C; Bayer, Shirley A et al. (2007) Generation and survival of midbrain dopaminergic neurons in weaver mice. Int J Dev Neurosci 25:299-307
Marti, Joaquin; Wills, Katherine V; Ghetti, Bernardino et al. (2002) A combined immunohistochemical and autoradiographic method to detect midbrain dopaminergic neurons and determine their time of origin. Brain Res Brain Res Protoc 9:197-205
Marti, Joaquin; Wills, Katherine V; Ghetti, Bernardino et al. (2002) Regional differences in the Purkinje cells settled pattern: a comparative autoradiographic study in control and homozygous weaver mice. Exp Neurol 175:168-81
Marti, J; Wills, K V; Ghetti, B et al. (2001) Evidence that the loss of Purkinje cells and deep cerebellar nuclei neurons in homozygous weaver is not related to neurogenetic patterns. Int J Dev Neurosci 19:599-610
Harkins, A B; Dlouhy, S; Ghetti, B et al. (2000) Evidence of elevated intracellular calcium levels in weaver homozygote mice. J Physiol 524 Pt 2:447-55
Marti, J; Wills, K V; Ghetti, B et al. (2000) The weaver gene continues to target late-generated dopaminergic neurons in midbrain areas at P90. Brain Res Dev Brain Res 122:173-81
Marti, J; Wills, K V; Ghetti, B et al. (2000) The weaver gene has no effect on the generation patterns of mesencephalic dopaminergic neurons. Brain Res Dev Brain Res 122:165-72
Broome, J D; Wills, K V; Lapchak, P A et al. (1999) Glial cell line-derived neurotrophic factor protects midbrain dopamine neurons from the lethal action of the weaver gene: a quantitative immunocytochemical study. Brain Res Dev Brain Res 116:1-7

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