ArticleiScience2023
Rap1 organizes lymphocyte front-back polarity via RhoA signaling and talin1.
Article in iScience, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 7 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
7 citing papers in PubMed, 9 citations in OpenAlex.
- ARHGAP20 organizes spatial Rap1-RhoA signaling coordination controlling adhesion dynamics during migration.bioRxiv : the preprint server for biology · 2026Article
- Emerging Potential of Ras-proximate-1 (Rap1) in Mediating Neurodegenerative Diseases.Current neuropharmacology · 2026Review
- A deficiency screen of the X chromosome for Rap1 GTPase dominant interacting genes in Drosophila border cell migration.G3 (Bethesda, Md.) · 2025Article
- Ras-proximate-1 (RAP1): a prognosis and therapeutic target in the metastatic spread of breast cancer.Clinical & experimental metastasis · 2025Review
- ARAP1 fine-tunes F-actin polymerization level in lymphocytes through RhoA inhibition.Frontiers in immunology · 2025Article
- Somatic RAP1B gain-of-function variant underlies isolated thrombocytopenia and immunodeficiency.The Journal of clinical investigation · 2024Article
- Mind the GAP: RASA2 and RASA3 GTPase-activating proteins as gatekeepers of T cell activation and adhesion.Trends in immunology · 2023Review
Corrections and comments
- Erratum issued
Authors and funding
9 authors at 3 institutions in 2 countries.
Funding
Abstract
Lymphocyte trafficking requires fine-tuning of chemokine-mediated cell migration. This process depends on cytoskeletal dynamics and polarity, but its regulation remains elusive. We quantitatively measured cell polarity and revealed critical roles performed by integrin activator Rap1 in this process, independent of substrate adhesion. Rap1-deficient naive T cells exhibited impaired abilities to reorganize the actin cytoskeleton into pseudopods and actomyosin-rich uropods. Rap1-GTPase activating proteins (GAPs), Rasa3 and Sipa1, maintained an unpolarized shape; deletion of these GAPs spontaneously induced cell polarization, indicative of the polarizing effect of Rap1. Rap1 activation required F-actin scaffolds, and stimulated RhoA activation and actomyosin contractility at the rear. Furthermore, talin1 acted on Rap1 downstream effectors to promote actomyosin contractility in the uropod, which occurred independently of substrate adhesion and talin1 binding to integrins. These findings indicate that Rap1 signaling to RhoA and talin1 regulates chemokine-stimulated lymphocyte polarization and chemotaxis in a manner independent of adhesion.
Indexed as
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What Socratic holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.