Local translation of extranuclear lamin B promotes axon maintenance.

Local translation of extranuclear lamin B promotes axon maintenance.
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DOI:
10.1016/j.cell.2011.11.064
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发表时间:
2012-02-17
期刊:
影响因子:
64.5
通讯作者:
Holt CE
Holt CE
中科院分区:
生物学1区
文献类型:
--
作者:
Yoon BC;Jung H;Dwivedy A;O'Hare CM;Zivraj KH;Holt CE

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Local protein synthesis plays a key role in regulating stimulus-induced responses in dendrites and axons. Recent genome-wide studies have revealed that thousands of different transcripts reside in these distal neuronal compartments, but identifying those with functionally significant roles presents a challenge. We performed an unbiased screen to look for stimulus-induced, protein synthesis-dependent changes in the proteome ofXenopus retinal ganglion cell (RGC) axons. The intermediate filament protein lamin B2 (LB2), normally associated with the nuclear membrane, was identified as an unexpected major target. Axonal ribosome immunoprecipitation confirmed translation of lb2 mRNA in vivo. Inhibition of lb2 mRNA translation in axons in vivo does not affect guidance but causes axonal degeneration. Axonal LB2 associates with mitochondria, and LB2-deficient axons exhibit mitochondrial dysfunction and defects in axonal transport. Our results thus suggest that axonally synthesized lamin B plays a crucial role in axon maintenance by promoting mitochondrial function. ► Unbiased proteomics approach to identify cue-induced changes in the axonal proteome ► Lamin B2 is locally synthesized in response to En-1 stimulation in retinal axons ► Loss of axonal lamin B2 leads to axon degeneration independently from the cell body ► Lamin B2 localizes to mitochondria, and its loss leads to mitochondrial dysfunction An unexpected cytoplasmic role for a lamin protein in axon maintenance could offer insight into the cell type-specific nature of some laminopathies.
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