Hedgehog signaling and the retina: insights into the mechanisms controlling the proliferative properties of neural precursors.

Abstract:

:Hedgehog signaling has been linked to cell proliferation in a variety of systems; however, its effects on the cell cycle have not been closely studied. In the vertebrate retina, Hedgehog's effects are controversial, with some reports emphasizing increased proliferation and others pointing to a role in cell cycle exit. Here we demonstrate a novel role for Hedgehog signaling in speeding up the cell cycle in the developing retina by reducing the length of G1 and G2 phases. These fast cycling cells tend to exit the cell cycle early. Conversely, retinal progenitors with blocked Hedgehog signaling cycle more slowly, with longer G1 and G2 phases, and remain in the cell cycle longer. Hedgehog may modulate cell cycle kinetics through activation of the key cell cycle activators cyclin D1, cyclin A2, cyclin B1, and cdc25C. These findings support a role for Hedgehog in regulating the conversion from slow cycling stem cells to fast cycling transient amplifying progenitors that are closer to cell cycle exit.

journal_name

Genes Dev

journal_title

Genes & development

authors

Locker M,Agathocleous M,Amato MA,Parain K,Harris WA,Perron M

doi

10.1101/gad.391106

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

3036-48

issue

21

eissn

0890-9369

issn

1549-5477

pii

20/21/3036

journal_volume

20

pub_type

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