Functional differentiation of ganglion cells from multipotent progenitor cells in sliced retina of adult goldfish

F. Tamalu, C. Chiba, Andrew Ishida, Takehiko Saito

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)297-305
Number of pages9
JournalJournal of Comparative Neurology
Volume419
Issue number3
DOIs
StatePublished - 2000

Keywords

  • Cytodifferentiation
  • Progenitor cells
  • Retinal ganglion cells
  • Sodium current
  • Whole-cell patch-clamp recordings

ASJC Scopus subject areas

  • Neuroscience(all)

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