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Measuring spatial visual loss in rats by retinotopic mapping of the superior colliculus using a novel multi-electrode array technique.
Rajendran Nair, Deepthi S; Camarillo, Juan Carlos-Martinez; Lu, Gengxi; Thomas, Biju B.
Afiliación
  • Rajendran Nair DS; Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine, University of Southern California, United States.
  • Camarillo JC; Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine, University of Southern California, United States; USC Ginsburg Institute for Biomedical Therapeutics, University of Southern California, United States.
  • Lu G; Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine, University of Southern California, United States.
  • Thomas BB; Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine, University of Southern California, United States; USC Ginsburg Institute for Biomedical Therapeutics, University of Southern California, United States. Electronic address: biju.thomas@med.usc.edu.
J Neurosci Methods ; 405: 110095, 2024 05.
Article en En | MEDLINE | ID: mdl-38403001
ABSTRACT

BACKGROUND:

The retinotopic map property of the superior colliculus (SC) is a reliable indicator of visual functional changes in rodents. Electrophysiological mapping of the SC using a single electrode has been employed for measuring visual function in rat and mouse disease models. Single electrode mapping is highly laborious requiring long-term exposure to the SC surface and prolonged anesthetic conditions that can adversely affect the mapping data. NEW

METHOD:

To avoid the above-mentioned issues, we fabricated a fifty-six (56) electrode multi-electrode array (MEA) for rapid and reliable visual functional mapping of the SC. Since SC is a dome-shaped structure, the array was made of electrodes with dissimilar tip lengths to enable simultaneous and uniform penetration of the SC.

RESULTS:

SC mapping using the new MEA was conducted in retinal degenerate (RD) Royal College of Surgeons (RCS) rats and rats with focal retinal damage induced by green diode laser. For SC mapping, the MEA was advanced into the SC surface and the visual activities were recorded during full-filed light stimulation of the eye. Based on the morphological examination, the MEA electrodes covered most of the exposed SC area and penetrated the SC surface at a relatively uniform depth. MEA mapping in RCS rats (n=9) demonstrated progressive development of a scotoma in the SC that corresponded to the degree of photoreceptor loss. MEA mapping in the laser damaged rats demonstrated the presence of a scotoma in the SC area that corresponded to the location of retinal laser injury. COMPARISON WITH EXISTING METHODS AND

CONCLUSIONS:

The use of MEA for SC mapping is advantageous over single electrode recording by enabling faster recordings and reducing anesthesia time. This study establishes the feasibility of the MEA technique for rapid and efficient SC mapping, particularly advantageous for evaluating therapeutic effects in retinal degenerate rat disease models.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Escotoma / Colículos Superiores Límite: Animals / Humans Idioma: En Revista: J Neurosci Methods Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Escotoma / Colículos Superiores Límite: Animals / Humans Idioma: En Revista: J Neurosci Methods Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos