A new mouse model with a myelinating disorder has been generated. It is severely hypomyelinated between birth and P50, and exhibits severe tremors during this period. After P50, myelin begins to accumulate in the brain, but it never completely achieves control levels. Hypomyelination occurs over the 'critical"""""""" period of brain development when axonal sprouting, neural networks, synaptic connections, and neuronal-glial relationships are being established. The overall objective of this proposal is to use this mouse as a unique model to study the cellular basis for the """"""""delayed"""""""" myelination, to determine how the brain can """"""""recover"""""""" from a major hypomyelinating event, to determine the cellular and functional consequences of retarded myelination during development and to determine how transient hypomyelination during a critical period of brain development influences the survival and structural integrity of neurons und neuronal connectivity in the brain. This application consists of three specific aims: (1) Examine myelination in the brains of the JOE (i.e. J37 Over-Expressing) mice. In this aim myelination will be examined in JOE and WT mice using an array of morphological and biochemical approaches; (2) determine the cellular mechanisms responsible for the delay in myelination in the JOE mice; (3) define the nature and extent of axon pathology, neuronal degeneration and neuronal abnormalities in the JOE mice. The proposed experiments will determine if the retarded myelination in JOE mice is normal or abnormal and if the mice form structurally normal myelin. The studies will assess the effect of golli J37 overexpression on oligodendrocyte (OL) development, survival and maturation; whether golli overexpression occurs in OL precursors, late progenitors, or immature OLs; how this affects the survival, differentiation or migration of these cells in JOE mice; and which cells are responsible for the later myelination in JOE mice. The effects of hypomyelination during the """"""""critical"""""""" period of brain development on several aspects of neuronal biology will be determined. These include: (a) cerebellar and cerebral cortical organization; (b) susceptibility to hypomyelination and survival; (c) axonal integrity and (d) axonal and dendritic organization. These studies are relevant to demyelinating diseases, like MS and leukodystrophies, and will enhance our understanding of myelination, remyelination and the effects of hypomyelination on neural function.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
2R01NS023022-19A1
Application #
6966043
Study Section
Special Emphasis Panel (ZRG1-MDCN-G (02))
Program Officer
Utz, Ursula
Project Start
1985-09-01
Project End
2010-06-30
Budget Start
2005-08-01
Budget End
2006-06-30
Support Year
19
Fiscal Year
2005
Total Cost
$357,281
Indirect Cost
Name
University of California Los Angeles
Department
Type
Schools of Medicine
DUNS #
092530369
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Fulton, Daniel; Paez, Pablo; Spreur, Vilma et al. (2011) Developmental activation of the proteolipid protein promoter transgene in neuronal and oligodendroglial cells of neostriatum in mice. Dev Neurosci 33:170-84
Paez, Pablo M; Fulton, Daniel; Spreuer, Vilma et al. (2011) Modulation of canonical transient receptor potential channel 1 in the proliferation of oligodendrocyte precursor cells by the golli products of the myelin basic protein gene. J Neurosci 31:3625-37
Fulton, Daniel; Paez, Pablo M; Fisher, Robin et al. (2010) Regulation of L-type Ca++ currents and process morphology in white matter oligodendrocyte precursor cells by golli-myelin proteins. Glia 58:1292-303
Fisher, Robin; Xie, Yuan-Yun (2010) Growth defects in the dorsal pallium after genetically targeted ablation of principal preplate neurons and neuroblasts: a morphometric analysis. ASN Neuro 2:e00046
Xie, Yuan-Yun; Jacobs, Erin; Fisher, Robin (2009) Targeted ablation and reorganization of the principal preplate neurons and their neuroblasts identified by golli promoter transgene expression in the neocortex of mice. ASN Neuro 1:
Paez, Pablo M; Fulton, Daniel J; Spreuer, Vilma et al. (2009) Golli myelin basic proteins regulate oligodendroglial progenitor cell migration through voltage-gated Ca2+ influx. J Neurosci 29:6663-76
Martin, Melanie; Reyes, Samuel D; Hiltner, Timothy D et al. (2007) T(2)-weighted microMRI and evoked potential of the visual system measurements during the development of hypomyelinated transgenic mice. Neurochem Res 32:159-65
Paez, Pablo M; Spreuer, Vilma; Handley, Vance et al. (2007) Increased expression of golli myelin basic proteins enhances calcium influx into oligodendroglial cells. J Neurosci 27:12690-9
Feng, Ji-Ming; Hu, Yanhong K; Xie, Lai-Hua et al. (2006) Golli protein negatively regulates store depletion-induced calcium influx in T cells. Immunity 24:717-27
Jacobs, Erin C; Pribyl, Thomas M; Feng, Ji-Ming et al. (2005) Region-specific myelin pathology in mice lacking the golli products of the myelin basic protein gene. J Neurosci 25:7004-13

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