Elucidating the immunomodulatory roles and mechanisms of CUL4B in the immune system: a comprehensive review

Our plain-English summary of Elucidating the immunomodulatory roles and mechanisms of CUL4B in the immune system: a comprehensive review, by S. He, Z. Wang, Y. Zhu, et al (Frontiers in Immunology, 2025).

The study

• Authors: S. He, Z. Wang, Y. Zhu, M. Sun, X. Lin
• Journal: Frontiers in Immunology
• Published: 2025;16:1473817
• Type of article: Review
• Cited by: 2 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

Abstract

Cullin 4B (CUL4B), a pivotal member of the Cullins protein family, plays a crucial role in immune regulation and has garnered significant research attention. CUL4B, through the Cullin 4B-RING E3 ubiquitin ligase (CRL4B) complex, regulates CD4+ T cell differentiation, fostering a balance between TH1 and TH2 subsets, and expedites DNA damage repair to bolster T cell persistence. In B cells, CUL4B upregulation stimulates immune responses but is linked to an unfavorable prognosis in lymphoma. In innate immunity, CUL4B modulates Toll-like receptor (TLR)-mediated anti-inflammatory responses, enhancing macrophage migration and adhesion. CUL4B also plays a role in potentiating anti-tumor immunity by restricting the activity of myeloid-derived suppressor cells (MDSCs). In disease pathogenesis, CUL4B limits MDSCs to enhance anti-tumor effects, and its inhibition in experimental autoimmune encephalomyelitis (EAE) models have demonstrated beneficial effects, underscoring its potential therapeutic significance in autoimmune diseases. Furthermore, CUL4B is involved in various immune-related cancers and inflammation, including pleural mesothelioma, human osteosarcoma, and colitis-associated cancer. In metabolic diseases, CUL4B regulates adipose tissue and insulin sensitivity, with its depletion improving metabolic phenotypes. This review highlights the pivotal role of CUL4B in maintaining immune homeostasis and provides novel perspectives and insights into the understanding and development of treatments for immune-related disorders.

Copyright © 2025 He, Wang, Zhu, Sun and Lin.

In plain English

This was a narrative review (titled a comprehensive review) by authors at the Department of Pathology, The First Hospital of China Medical University, summarising published laboratory studies on Cullin 4B (CUL4B) and the Cullin 4B-RING E3 ubiquitin ligase (CRL4B) complex in immune regulation. It did not study asbestos, asbestos exposure or any human exposure group, and reported no new experiments of its own. The review described work on CD4+ and CD8+ T cells (DNA damage repair, cell cycle, TH1 and TH2 differentiation), B cells and gammaherpesvirus infection, macrophages and Toll-like receptor signalling, myeloid-derived suppressor cells and tumour immunity, autoimmune disease models, and adipose tissue and insulin sensitivity. Pleural mesothelioma was mentioned in the abstract, in a summary table and in one sentence of the text, without any discussion of asbestos. In that sentence, citing a separate study, the authors stated that CUL4B overexpression in pleural mesothelioma is associated with worse patient outcomes, and that its downregulation reduces tumour cell proliferation and increases cell death by regulating TGF-beta 1 expression. The authors concluded that CUL4B has a pivotal role in maintaining immune homeostasis.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Narrative review of published laboratory studies (described by the journal as a review article)
• Who was studied: No study population; the article reviewed previously published cell, mouse and tumour-tissue studies of CUL4B
• Exposure: No asbestos or other environmental or occupational exposure was studied; the subject was the protein CUL4B and the CRL4B complex
• Main results:
  • Reviewed finding on pleural mesothelioma: CUL4B overexpression associated with worse patient outcomes; its downregulation reduced tumour cell proliferation and increased cell death via TGF-beta 1 regulation (from a cited study, not new data)
  • Pleural mesothelioma also appears in the summary table (Table 1) under inflammation-related cancers
  • Reviewed finding in B cells: in CUL4B conditional knockout mice infected with MHV68, virus-positive germinal centre B cells declined 116-fold compared with wild-type controls, overall germinal centre B cell frequency fell three-fold and infected germinal centre B cells fell fifteen-fold
  • Reviewed finding in tumour immunity: CUL4B restricts accumulation and suppressive activity of myeloid-derived suppressor cells (MDSCs)
  • Reviewed finding in metabolic disease: adipocyte-specific Cul4b knockout mice on a high-fat diet had increased body fat but improved insulin sensitivity and glucose tolerance
• The authors' conclusion: The authors concluded that CUL4B has a pivotal role in maintaining immune homeostasis and offers perspectives for treating immune-related disorders
• Limitations the authors state:
  • The authors stated that the molecular pathways by which CUL4B facilitates germinal centre B cell infection or expansion remain unknown
  • The authors stated that research on CUL4B in the DNA-repair context is still emerging, so they discussed Cul4A-RING ubiquitin E3 ligase instead
  • The authors stated that their discussion of CRL4B-mediated protein degradation was relatively limited and called it an oversight in research focus

Topics

Medical terms in this study, explained in our Lexicon: Prognosis, Macrophage, Inflammation, Pleural Mesothelioma.

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