High K+ and IGF-1 protect cerebellar granule neurons via distinct signaling pathways.

Abstract:

:In culture, cerebellar granule neurons die of apoptosis in serum-free media containing a physiologic level of K(+) but survive in a depolarizing concentration of K(+) or when insulin-like growth factor 1 (IGF-1) is added. Both Akt/PKB activation and caspase-3 inhibition were implicated as the underlying neuroprotective mechanisms. The duration of high K(+), however, induced survival effects that outlasted its transient activation of Akt, and granule neurons derived from caspase-3 knockout mice died to the same extent as did those from wild-type mice, suggesting that additional mechanisms are involved. To delineate these survival mechanisms, we compared the activities of two major survival pathways after high K(+)-induced depolarization or IGF-1 stimulation. Although IGF-1 promoted neuronal survival by activating its tyrosine kinase receptor, high K(+) depolarization provided the same effect by increasing the Ca(2+) influx through the L Ca(2+) channel. Moreover, high K(+)-induced depolarization resulted in sustained activation of MAP kinase, whereas IGF-1 activated Akt in 4 hr. Inhibition of MEK (MAP kinase kinase) by either PD98059 or UO126 abolished the protective effect of high K(+)-induced depolarization, but not that of IGF-1, suggesting that activation of the MAP kinase pathway is necessary for high K(+) neuroprotective effects. We demonstrated also that high K(+)-induced depolarization, but not IGF-1, increased phosphorylation of cAMP-response element-binding protein (CREB) and protein synthesis, both of which can be blocked by UO126. Overall, our findings suggested that high K(+)-induced depolarization, unlike IGF-1, promoted neuronal survival via activating MAP kinase, possibly by increasing CREB-dependent transcriptional activation of specific proteins that promote neuronal survival.

journal_name

J Neurosci Res

authors

Zhong J,Deng J,Huang S,Yang X,Lee WH

doi

10.1002/jnr.20024

keywords:

subject

Has Abstract

pub_date

2004-03-15 00:00:00

pages

794-806

issue

6

eissn

0360-4012

issn

1097-4547

journal_volume

75

pub_type

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