Spinal cord injury (SCI) in adult rats initiates a cascade of events producing a non-permissive environment for axonal regeneration. This non-favorable environment could be due to the expression of repulsive factors like the Eph receptors and their ligands (ephrins). The Eph receptors and their respective ephrins play a major in axonal pathfinding and target recognition during ventral nervous system (CNS) development, and their action is mediated by repellent forces between receptor and ligand. The possible role that these ligands play after CNS trauma is unknown. The goal of this pilot study is to investigate the role of Ephrin B ligands in producing a non-permissive environment for axonal regeneration after SCI. Molecular biology, protein biochemistry, and neuroimaging tracing strategies will be used to analyze the expression and function of these proteins in rats injured at the T10 level..
The first aim will focus on the spatial and temporal expression of ephrin B, mRNAs and proteins, after spinal cord trauma. These experiments will provide temporal and spatial information about ephrin B expression after central nervous system (CNS) lesion at the nucleic and amino acid level. The expression pattern will be correlated both with the lack of regeneration of specific supraspinal pathways and the non-favorable regions for axonal outgrowth and circuit reconnection generated at the lesion site after moderate spinal cord contusion. In the second aim, we will determine the possible role of ephrins B as repulsive molecular cues that restrict axonal regeneration after SCI. For this study, specific polyclonal antibodies against the amino terminus of the ephrin B ligands or fusion proteins expressing the amino terminus of the ephrins B will be administered to contused rats to black the endogenous receptor-ligand interaction. Therefore, defining the specific temporal and spatial expression of individual ephrins B, both on the regenerating fibers and in the local microenvironment, may lead to novel therapeutic strategies to enhanced regeneration and functional recovery after SCI.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Minority Biomedical Research Support - MBRS (S06)
Project #
5S06GM008224-17
Application #
6503002
Study Section
Minority Programs Review Committee (MPRC)
Project Start
2001-08-01
Project End
2002-07-31
Budget Start
Budget End
Support Year
17
Fiscal Year
2001
Total Cost
Indirect Cost
Name
University of Puerto Rico Med Sciences
Department
Type
DUNS #
City
San Juan
State
PR
Country
United States
Zip Code
00936
Rijpma, Sanna R; van der Velden, Maarten; González-Pons, Maria et al. (2016) Multidrug ATP-binding cassette transporters are essential for hepatic development of Plasmodium sporozoites. Cell Microbiol 18:369-83
Padín-Irizarry, Vivian; Colón-Lorenzo, Emilee E; Vega-Rodríguez, Joel et al. (2016) Glutathione-deficient Plasmodium berghei parasites exhibit growth delay and nuclear DNA damage. Free Radic Biol Med 95:43-54
Jardón, Javier; Izquierdo, Natalio J; Renta, Jessica Y et al. (2016) Ocular Findings in Patients with the Hermansky-Pudlak Syndrome (Types 1 and 3). Ophthalmic Genet 37:89-94
Rivera-Peña, Bianca; Ruíz-Fullana, Francisco J; Vélez-Reyes, Germán L et al. (2016) HPV-16 infection modifies overall survival of Puerto Rican HNSCC patients. Infect Agent Cancer 11:47
Velásquez-Martínez, Maria C; Vázquez-Torres, Rafael; Rojas, Legier V et al. (2015) Alpha-1 adrenoreceptors modulate GABA release onto ventral tegmental area dopamine neurons. Neuropharmacology 88:110-21
Vega-Rodríguez, Joel; Pastrana-Mena, Rebecca; Crespo-Lladó, Keila N et al. (2015) Implications of Glutathione Levels in the Plasmodium berghei Response to Chloroquine and Artemisinin. PLoS One 10:e0128212
Zenón, Frances; Cantres-Rosario, Yisel; Adiga, Radhika et al. (2015) HIV-infected microglia mediate cathepsin B-induced neurotoxicity. J Neurovirol 21:544-58
Ortiz, A P; Unger, E R; Muñoz, C et al. (2014) Cross-sectional study of HPV-16 infection in a population-based subsample of Hispanic adults. BMJ Open 4:e004203
Rosas, Odrick R; Torrado, Aranza I; Santiago, Jose M et al. (2014) Long-term treatment with PP2 after spinal cord injury resulted in functional locomotor recovery and increased spared tissue. Neural Regen Res 9:2164-73
Mosquera, Laurivette; Colón, Jennifer M; Santiago, José M et al. (2014) Tamoxifen and estradiol improved locomotor function and increased spared tissue in rats after spinal cord injury: their antioxidant effect and role of estrogen receptor alpha. Brain Res 1561:11-22

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