In humans, disorders of the optic nerve, such as ischemic optic neuropathy and some primary optic nerve tumors, can have combined histopathologic effects on the nerve and the macula, leading to cell death and visual decline. In mammals, injury to axons within the central nervous system leads almost inevitably to the death of the axotomized neurons. Those few which survive are unable to regenerate successfully because of the inhibitory properties of CNS glia. The axons of amphibia do not have to contend with this glial inhibition, they successfully regenerate after injury despite a considerable ganglion cell loss in the retina. This makes the frog optic nerve, which is a particularly considerable ganglion cell loss in the retina. This makes the frog optic nerve, which is a particularly accessible CNS tract, a good model system in which to study the effects that damaging the optic nerve have on ganglion cell death in the retina. The long term goal of this research is to elucidate the factors that determine which of the retinal ganglion cells undergo cell death after axotomy, and to determine if it is possible to rescue some of those ganglion cells from dying. This project aims firstly to quantify the numbers and types of ganglion cells which survive after cutting the optic nerve, both when regeneration proceeds normally or is curtailed.
The second aims i s to study the ways in which the surviving retinal ganglion cells compensate for the loss of their neighbors by remodeling their dendrites.
The third aim will quantify the effects on retinal ganglion cell survival of manipulating the optic nerve stump environment by changing the number and type of glial cells that surround the axons.
The fourth aim i s to determine if growth factors can increase the number of cells surviving axotony. In the long term this model may prove useful for increasing our knowledge of the basic mechanisms that can rescue nerve cells from death after damage.

Project Start
1998-08-01
Project End
1999-07-31
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
14
Fiscal Year
1998
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
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
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
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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