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Overexpression of RhoH Permits to Bypass the Pre-TCR Checkpoint
Open accessAbstract
RhoH, an atypical small Rho-family GTPase, critically regulates thymocyte differentiation through the coordinated interaction with Lck and Zap70. Therefore, RhoH deficiency causes defective T cell development, leading to a paucity of mature T cells. Since there has been no gain-of-function study on RhoH before, we decided to take a transgenic approach to assess how the overexpression of RhoH affects the development of T cells. Although RhoH transgenic (RhoHtg) mice expressed three times more RhoH protein than wild-type mice, β-selection, positive, and negative selection in the thymus from RhoHtg mice were unaltered. However, transgenic introduction of RhoH into Rag2 deficient mice resulted in the generation of CD4+ CD8+ (DP) thymocytes, indicating that overexpression of RhoH could bypass β-selection without TCRβ gene rearrangement. This was confirmed by the in vitro development of DP cells from Rag2-/-RhoHtg DN3 cells on TSt-4/Dll-1 stroma in an Lck dependent manner. Collectively, our results indicate that an excess amount of RhoH is able to initiate pre-TCR signaling in the absence of pre-TCR complexes.
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TL;DR
Overexpression of RhoH in transgenic mice largely leaves normal thymocyte development intact, but in Rag2-deficient mice it generates CD4+CD8+ (DP) thymocytes without TCRβ rearrangement, bypassing the pre-TCR checkpoint. This bypass is thymocyte-intrinsic and Lck-dependent, suggesting excess RhoH can initiate pre-TCR signaling in the absence of pre-TCR complexes.
Key findings
- HA-tagged RhoH was functionally equivalent to endogenous RhoH: it restored thymic cellularity and CD4SP/CD8SP differentiation in RhoH-/- mice, restored CD2 and CD5 expression on DP thymocytes, and restored TCR-induced ERK phosphorylation.
- In wild-type background, RhoH overexpression had little effect on thymocyte subsets, but caused a slight increase in phospho-Src in DN3 cells, increased CD2 and CD5 on DP cells, reduced naive CD4 and CD8 T cells, and increased activated/memory T cells in the periphery.
- Crossing RhoHtg mice with Rag2-/- mice produced DP thymocytes without TCRβ protein, in a dose-dependent manner (homozygous tg/tg generated more DP than heterozygous tg/-), but did not bypass positive selection, as no mature CD4SP or CD8SP cells appeared.
- Sorted Rag2-/-RhoHtg DN3 cells differentiated into DP cells in vitro on TSt-4/Dll-1 stroma with IL-7, and this was strongly inhibited by an Lck inhibitor, indicating Lck dependence.
Methods
- Generated hCD2 promoter-driven HA-tagged RhoH transgenic mice, backcrossed to C57BL/6J, and bred them to RhoH-/-, Rag2-/-, MHC-/-, and Nur77-GFP backgrounds.
- Analyzed thymocytes and splenocytes from 4–8 week old mice by flow cytometry, including cell sorting of DN3 cells, intracellular phospho-Src staining, and western blot for RhoH.
- Cultured 5×10^5 cells with TSt-4/Dll-1 stromal cells for 14 days in RPMI plus IL-7 (0.5 ng/ml), with or without Lck inhibitor III; statistics used unpaired Student’s t-test or two-way ANOVA with Tukey post-test.
Limitations
- The paper states that further analyses using RhoH conditional knockout mice are needed to define RhoH effector function in peripheral T cells, because the paucity of normal mature T cells in RhoH-/- mice made it difficult to determine RhoH’s requirement in primary peripheral T cells.
- The paper notes that it could not observe any apparent increase in anti-TCR mAb-stimulated “strong” signal transduction in RhoHtg mature T cells and DP thymocytes, and suggests effects might differ under weaker TCR stimulation or at different developmental stages.
- Evident from the text: the in vitro differentiation result in Fig 4A is shown from one out of three independent experiments, and the Lck-dependence conclusion relies on a pharmacological inhibitor rather than genetic Lck deletion.
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23 Own result · 10 Own interpretation · 3 Check pending · 2 No full text of the sources · 2 Not checked yet
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We finally observed RhoH transgene made small increase of the phosphorylation of Src family protein which act as the key kinases on T cell development in thymus (Fig 2B)”
- Also stated in: § Discussion · plain
“In fact, we have found that Src family protein including Lck were activated under steady state in DN3 cells from RhoHtg mice”
§ Overexpression of RhoH Permits to Bypass the Pre-TCR Checkpoint > Results > Effects of over-expression of RhoH on T cells in the thymus and peripheral tissues
plainstates a cause- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Also stated in: § Discussion · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In the periphery, the percentage and numbers of splenic CD4+ and CD8+ T cells from RhoHtg mice were similar to that of wild-type mice (Fig 2E and S2B Fig).”
§ Overexpression of RhoH Permits to Bypass the Pre-TCR Checkpoint > Results > Effects of over-expression of RhoH on T cells in the thymus and peripheral tissues
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Although RhoH transgenic (RhoHtg) mice expressed three times more RhoH protein than wild-type mice, β-selection, positive, and negative selection in the thymus from RhoHtg mice were unaltered.”
§ Overexpression of RhoH Permits to Bypass the Pre-TCR Checkpoint > Abstract
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“GFP expression on DP to CD4SP cells from RhoHtg Nur77-GFP mice, which were able to monitor the strength of TCR signaling in vivo during T cell developments [23], was also the same as the wild-type controls (S3A Fig).”
§ Overexpression of RhoH Permits to Bypass the Pre-TCR Checkpoint > Results > Effects of over-expression of RhoH on T cells in the thymus and peripheral tissues
What the sources say
- Check pendingcites [23] GL Stritesky, 2013, Murine thymic selection quantified using a unique method to capture deleted T cells, Proceedings of the National Academy of Sciences of the United States of America source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“In addition to the unaltered Nur77-GFP expression during thymic T cell differentiation (S3A Fig), anti-TCR antibody-induced activation of ERK in DP and CD4SP cells from RhoHtg mice was also not increased (S3B Fig)”
§ Overexpression of RhoH Permits to Bypass the Pre-TCR Checkpoint > Discussion
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In the citing paper
“RhoH myristoylation at the N-terminal may also assist RhoH attachment to the plasma membrane and promote its interacting partners, Lck, ZAP−70 and Syk recruitment to the membrane to facilitate T cell receptor (TCR) signalling [23,24,25].”
From The Role of RhoH in TCR Signalling and Its Involvement in Diseases (2021) · cites this paper as [24]
In the citing paper
“As a result, activated ZAP−70 will promote linker of activated T cells (LAT) and SLP76 signalling in T cell, crucial for T cell activation and development [23,24,25,36].”
From The Role of RhoH in TCR Signalling and Its Involvement in Diseases (2021) · cites this paper as [24]
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Self-citationThe Role of RhoH in TCR Signalling and Its Involvement in Diseases
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Self-citation
Metadata
- Authors
- Tamehiro, N., Oda, H., Shirai, M., & Suzuki, H.
- Affiliations
- National Center for Global Health and Medicine (JP)
- Yamaguchi University (JP)
- Corresponding author
- Suzuki, Harumi
- ORCID
- Suzuki, Harumi
- Venue
- PLOS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2015-06-26
- Volume
- 10
- Issue
- 6
- Pages
- e0131047
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC4482576
- OpenAlex
- W2145592512
- Cited by
- 14
- References
- 45
- Citations by year
- 2025: 1 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 1 · 2019: 1 · 2018: 1 · 2017: 3 · 2016: 1
- FWCI
- 0.68
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- PLoS ONE (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Figshare (submittedVersion, cc-by)
- Funders
- National Center for Global Health and Medicine (25-103)
- Japan Society for the Promotion of Science (25460606, 15K09568, 25871164)
- Topics
- Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Keywords
- RhoH, pre-TCR signaling, T cell development, thymocyte differentiation, beta-selection, double-negative thymocytes, Lck, ZAP-70, transgenic mice
- MeSH terms
- Animals, Cell Differentiation, Cells, Cultured, Female, Mice, Inbred C57BL, Mice, Inbred ICR, Mice, Transgenic, T-Lymphocytes, Thymus Gland, Transcription Factors, Up-Regulation, Receptors, Antigen, T-Cell, alpha-beta, Gene Expression Regulation, Developmental, Genes, T-Cell Receptor, rho GTP-Binding Proteins, Mice, Cell Cycle Checkpoints
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