TGF-β1 enhances Kv2.1 potassium channel protein expression and promotes maturation of cerebellar granule neurons.

Abstract:

:Members of the transforming growth factor-β (TGF-β) family of cytokines are involved in diverse physiological processes. Although TGF-β is known to play multiple roles in the mammalian central nervous system (CNS), its role in neuronal development has not been explored. We have studied the effects of TGF-β1 on the electrophysiological properties and maturation of rat primary cerebellar granule neurons (CGNs). We report that incubation with TGF-β1 increased delayed rectifier potassium current (I(K) ) amplitudes in a dose- and time-dependent manner, but did not affect the kinetic properties of the channel. Exposure to TGF-β1 (20 ng/ml) for 36 h led to a 37.2% increase in I(K) amplitudes. There was no significant change in mRNA levels for the key Kv2.1 channel protein, but translation blockade abolished the increase in protein levels and channel activity, arguing that TGF-β1 increases I(K) amplitudes by upregulating translation of the Kv2.1 channel protein. Although TGF-β1 treatment did not affect the activity of protein kinase A (PKA), and constitutive activation of PKA with forskolin failed to increase I(K) amplitudes, inhibition of PKA prevented channel upregulation, demonstrating that basal PKA activity is required for TGF-β1 stimulation of I(K) channel activity. TGF-β1 also promoted the expression of the γ-aminobutyric acid (GABA(A) ) receptor α6 subunit, a marker of mature CGNs, and calcium influx during depolarizing stimuli was reduced by TGF-β1. The effects of TGF-β1 were only observed during a narrow developmental time-window, and were lost as CGNs matured. These findings suggest that TGF-β1 upregulates K(+) channel expression and I(K) currents and thereby promotes CGN maturation.

journal_name

J Cell Physiol

authors

Zhuang JL,Wang CY,Zhou MH,Duan KZ,Mei YA

doi

10.1002/jcp.22735

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

297-307

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

227

pub_type

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