CaMKIIα3′ untranslated region-directed mRNA translocation in living neurons:: Visualization by GFP linkage

被引:214
作者
Rook, MS
Lu, M
Kosik, KS
机构
[1] Brigham & Womens Hosp, Ctr Neurol Dis, Boston, MA 02115 USA
[2] Harvard Univ, Sch Med, Dept Neurol, Boston, MA 02115 USA
关键词
RNA localization; RNA translocation; CaMKII alpha; 3 ' UTR; RNA granules; synaptic plasticity;
D O I
10.1523/JNEUROSCI.20-17-06385.2000
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The CaMKII alpha mRNA extends into distal hippocampal dendrites, and the 3' untranslated region (3'UTR) is sufficient to mediate this localization. We labeled the 3'UTR of the CaMKII alpha mRNA in hippocampal cultures by using a green fluorescent protein (GFP)/MS2 bacteriophage tagging system. The CaMKII alpha 3'UTR formed discrete granules throughout the dendrites of transfected cells. The identity of the fluorescent granules was verified by in situ hybridization. Over 30 min time periods these granules redistributed without a net increase in granule number; with depolarization there is a tendency toward increased numbers of granules in the dendrites. These observations suggest that finer time resolution of granule motility might reveal changes in the motility characteristics of granules after depolarization. So that motile granules could be tracked, shorter periods of observation were required. The movements of motile granules can be categorized as oscillatory, unidirectional anterograde, or unidirectional retrograde. Colocalization of CaMKII alpha 3'UTR granules and synapses suggested that oscillatory movements allowed the granules to sample several local synapses. Neuronal depolarization increased the number of granules in the anterograde motile pool. Based on the time frame over which the granule number increased, the translocation of granules may serve to prepare the dendrite for mounting an adequate local translation response to future stimuli. Although the resident pool of granules can respond to signals that induce local translation, the number of granules in a dendrite might reflect its activation history.
引用
收藏
页码:6385 / 6393
页数:9
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