Cited by 88Microtubule and mitosis dynamicsCellular Mechanics and InteractionsProtein Kinase Regulation and GTPase Signaling

Microtubule-associated Protein 2c Reorganizes Both Microtubules and Microfilaments into Distinct Cytological Structures in an Actin-binding Protein-280–deficient Melanoma Cell Line

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Cunningham, C. Casey, Leclerc, Nicole, Flanagan, Lisa A., Lu, Mei, Janmey, Paul A., Kosik, Kenneth S.·1997·The Journal of Cell Biology

Abstract

The emergence of processes from cells often involves interactions between microtubules and microfilaments. Interactions between these two cytoskeletal systems are particularly apparent in neuronal growth cones. The juvenile isoform of the neuronal microtubule-associated protein 2 (MAP2c) is present in growth cones, where we hypothesize it mediates interactions between microfilaments and microtubules. To approach this problem in vivo, we used the human melanoma cell, M2, which lacks actin-binding protein-280 (ABP-280) and forms membrane blebs, which are not seen in wild-type or ABP-transfected cells. The microinjection of tau or mature MAP2 rescued the blebbing phenotype; MAP2c not only caused cessation of blebbing but also induced the formation of two distinct cellular structures. These were actin-rich lamellae, which often included membrane ruffles, and microtubule-bearing processes. The lamellae collapsed after treatment with cytochalasin D, and the processes retracted after treatment with colchicine. MAP2c was immunocytochemically visualized in zones of the cell that were devoid of tubulin, such as regions within the lamellae and in association with membrane ruffles. In vitro rheometry confirmed that MAP2c is an efficient actin gelation protein capable of organizing actin filaments into an isotropic array at very low concentrations; tau and mature MAP2 do not share this rheologic property. These results suggest that MAP2c engages in functionally specific interactions not only with microtubules but also with microfilaments.

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  • MAPs bundle actin filaments and cross-link the cellular cytoskeleton formed by microtubules and actin filaments.

    “In addition, MAPs bundle actin filaments and cross-link the cellular cytoskeleton formed by microtubules and actin filaments (Fig. 1a)3–10.”

    From Multivalent cross-linking of actin filaments and microtubules through the microtubule-associated protein Tau (2017) · cites this paper as [10]

    The Results section (‘MAP2c Causes Actin Gelation In Vitro’; page unavailable) reports that MAP2c forms actin bundles at higher concentrations or lower ionic strength. But the Discussion (‘In Vivo Functions of MAP2c’; page unavailable) explicitly says the data cannot determine whether MAP2c cross-links microtubules to actin filaments. The claim presents that cross-linking as established for MAPs generally. (LLM, conf=0.90)

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Authors
Cunningham, C. C., Leclerc, N., Flanagan, L. A., Lu, M., Janmey, P. A., & Kosik, K. S.
Affiliations
  • Brigham and Women's Hospital (US)
  • *Department of Medicine, Division of Experimental Medicine, ‡Department of Neurology, Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115
Corresponding author
Leclerc, Nicole
Venue
The Journal of Cell Biology
Published
1997-02-24
Volume
136
Issue
4
Pages
845-857
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2023263503
Cited by
88
References
1
Citations by year
2024: 1 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 2 · 2019: 3 · 2018: 2 · 2017: 4 · 2016: 3 · 2015: 1 · 2014: 2 · 2012: 4
FWCI
2.92
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (1r55ca057479-01)
  • National Heart, Lung, and Blood Institute (HL-48743, P01HL048743)
  • National Cancer Institute (CA57479)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-38452, P01DK038452)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR038910)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
MAP2c, membrane blebs, ruffles, tau protein, cytoskeletal rearrangement, cellular processes, rheology
MeSH terms
Actins, Carrier Proteins, Humans, Melanoma, Microfilament Proteins, Actin Cytoskeleton, Microinjections, Microtubule-Associated Proteins, Microtubules, Tumor Cells, Cultured, tau Proteins, Cell Size

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