Functional differentiation of ganglion cells from multipotent progenitor cells in sliced retina of adult goldfish.
J Comp Neurol
; 419(3): 297-305, 2000 Apr 10.
Article
en En
| MEDLINE
| ID: mdl-10723006
Multipotent progenitor cells at the retinal margin of adult goldfish give rise to all cell types in the rest of the retina. We took advantage of this spatial arrangement of progenitor and mature cells in slices of peripheral retina, to investigate the appearance and maturation of voltage-activated Na(+) current. We divided the peripheral retina into three broad regions (marginal, intermediate, and mature) on the basis of their morphological development. Whole-cell patch-clamp recordings were performed in ruptured-patch mode, so that cells from which currents were recorded could be identified by Lucifer Yellow fills. No voltage-activated Na(+) current was detected in the slender, peripherally located marginal cells. Voltage-activated Na(+) currents were detected in rounded cells found alongside or near marginal cells, facing the vitreal side of the retina. Some of these "intermediate cells" had a long axon-like process which ran along the vitreal surface. Intermediate cells adjacent to the marginal region tended to have smaller Na(+) currents than intermediate cells closer to the mature region. On average, the maximum Na(+) current amplitude recorded from intermediate cells was roughly 6-fold smaller than that of mature ganglion cells. In addition, the activation threshold of the Na(+) current in intermediate cells was nearly 14 mV more positive than that of mature ganglion cells. The results indicate that voltage-activated Na(+) current, as a possible marker of retinal ganglion cells, begins to develop well before these cells migrate to their adult position within the retina.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Retina
/
Células Ganglionares de la Retina
/
Células Madre
/
Carpa Dorada
Límite:
Animals
Idioma:
En
Revista:
J Comp Neurol
Año:
2000
Tipo del documento:
Article
Pais de publicación:
Estados Unidos