Cited by 26RNA Research and SplicingMicrotubule and mitosis dynamicsNuclear Structure and Function

Mammalian microtubule P-body dynamics are mediated by nesprin-1

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Rajgor, Dipen, Mellad, Jason A., Soong, Daniel, Rattner, Jerome B., Fritzler, Marvin J., Shanahan, Catherine M.·2014·Journal of Cell Biology

Abstract

Nesprins are a multi-isomeric family of spectrin-repeat (SR) proteins, predominantly known as nuclear envelope scaffolds. However, isoforms that function beyond the nuclear envelope remain poorly examined. Here, we characterize p50(Nesp1), a 50-kD isoform that localizes to processing bodies (PBs), where it acts as a microtubule-associated protein capable of linking mRNP complexes to microtubules. Overexpression of dominant-negative p50(Nesp1) caused Rck/p54, but not GW182, displacement from microtubules, resulting in reduced PB movement and cross talk with stress granules (SGs). These cells disassembled canonical SGs induced by sodium arsenite, but not those induced by hydrogen peroxide, leading to cell death and revealing PB-microtubule attachment is required for hydrogen peroxide-induced SG anti-apoptotic functions. Furthermore, p50(Nesp1) was required for miRNA-mediated silencing and interacted with core miRISC silencers Ago2 and Rck/p54 in an RNA-dependent manner and with GW182 in a microtubule-dependent manner. These data identify p50(Nesp1) as a multi-functional PB component and microtubule scaffold necessary for RNA granule dynamics and provides evidence for PB and SG micro-heterogeneity.

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  • Disruption of nesprin-1 activity through mutations and RNAi significantly decreased miRNA suppression of target mRNA and P-body formation.

    “Disruption of nesprin-1 activity through mutations and RNAi significantly decreased miRNA suppression of target mRNA and P-body formation.”

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Authors
Rajgor, D., Mellad, J. A., Soong, D., Rattner, J. B., Fritzler, M. J., & Shanahan, C. M.
Affiliations
  • King's College London (GB)
  • University of Calgary (CA)
Corresponding author
Shanahan, Catherine M.
Venue
Journal of Cell Biology
Published
2014-05-26
Volume
205
Issue
4
Pages
457-475
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2043148470
Cited by
26
References
52
Citations by year
2025: 1 · 2024: 3 · 2022: 1 · 2020: 1 · 2018: 3 · 2017: 2 · 2016: 5 · 2015: 8 · 2014: 2
FWCI
2.32
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (publishedVersion, other-oa)
  • Research Portal (King's College London) (submittedVersion)
Funders
British Heart Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
Keywords
nesprin-1, P-bodies, microtubules, stress granules, GW182, miRNA-induced silencing complex, Argonaute 2, messenger ribonucleoprotein, sodium arsenite, hydrogen peroxide, apoptosis
MeSH terms
Animals, Cytoplasmic Granules, Cytoskeletal Proteins, Enzyme Inhibitors, Fibroblasts, Humans, Hydrogen Peroxide, Mammals, Microtubules, Muscle, Smooth, Vascular, Nerve Tissue Proteins, Nuclear Proteins, RNA, Messenger, Osteosarcoma, Stress, Physiological, Oxidants, Sodium Compounds, Arsenites, Dermis, Myoblasts, Cell Line, Tumor, Mice, Gene Knockdown Techniques

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