ATP released via gap junction hemichannels from the pigment epithelium regulates neural retinal progenitor proliferation.

Abstract:

:The retinal pigment epithelium (RPE) plays an essential role in the normal development of the underlying neural retina, but the mechanisms by which this regulation occurs are largely unknown. Ca2+ transients, induced by the neurotransmitter ATP acting on purinergic receptors, both increase proliferation and stimulate DNA synthesis in neural retinal progenitor cells. Here, we show that the RPE regulates proliferation in the underlying neural retina by the release of a soluble factor and identify that factor as ATP. Further, we show that this ATP is released by efflux through gap junction connexin 43 hemichannels, the opening of which is evoked by spontaneous elevations of Ca2+ in trigger cells in the RPE. This release mechanism is localized within the RPE cells to the membranes facing the neural retina, a location ideally positioned to influence neural retinal development. ATP released from RPE hemichannels speeds both cell division and proliferation in the neural retina.

journal_name

Neuron

journal_title

Neuron

authors

Pearson RA,Dale N,Llaudet E,Mobbs P

doi

10.1016/j.neuron.2005.04.024

subject

Has Abstract

pub_date

2005-06-02 00:00:00

pages

731-44

issue

5

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(05)00360-0

journal_volume

46

pub_type

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