tumour circular rnas elicit anti-tumour immunity by encoding cryptic peptides cryptic peptides efficiently primed naive CD4 + and CD8 + T cells - benefits-of-research-peptides circular RNA Tumour Circular RNAs Elicit Anti-Tumour Immunity by Encoding Cryptic Peptides

benefits-of-peptide Recent groundbreaking research has revealed a novel mechanism through which tumour circular RNAs (circRNAs) can actively engage the immune system to combat cancer中山大学宋尔卫，苏士成团队：肿瘤环状RNA激发抗肿瘤免疫. These circRNAs, previously often dismissed as noncoding or even junk DNA, possess the remarkable ability to encode "cryptic peptides.作者：D Huang·2024·被引用次数：169—Thecryptic peptides efficiently primed naive CD4 + and CD8 + T cellsin an antigen-specific manner and induced anti-tumour immunity." These peptides, when presented by cancer cells, can effectively prime naive T cells, thereby eliciting a potent anti-tumour immunity.GSE210792 - GEO Accession viewer - NIH This discovery challenges conventional understanding of circRNAs and opens new avenues for cancer immunotherapy.

The pivotal study, published in Nature, details how specific tumour-associated circRNAs can be noncanonically translated to produce these cryptic peptides. These peptides are not typically found in healthy cells and can therefore serve as unique identifiers for cancer.Baltimore classification - Wikipedia When these peptides bind to human leukocyte antigen (HLA) molecules on the surface of tumour cells, they become visible to the immune system, specifically to T cells. This interaction is crucial for initiating an adaptive immune response against the cancer.SysteMHC

The Role of Cryptic Peptides in Immune Activation

Cryptic peptides are fragments of proteins that are normally hidden from the immune system. However, under conditions of cellular stress, mutation, or altered gene expression, as often occurs in cancer, these peptides can be exposedTumour circular RNAs elicit anti-tumour immunity by .... The research highlights that circRNAs can act as a source for these immunogenic cryptic peptidesCircular RNA vaccines expose cryptic peptides. Upon translation from circRNA, these peptides are processed and presented by HLA class I molecules. This presentation is a critical step in the immune surveillance process, signaling to cytotoxic T lymphocytes (CTLs) that the cell is abnormal and should be eliminated.

The effectiveness of these cryptic peptides lies in their ability to prime naive CD4+ and CD8+ T cells. Naive T cells are the immune system's fresh recruits, having not yet encountered a specific antigenNature research paper: Tumour circular RNAs elicit anti- .... When exposed to these tumour-derived cryptic peptides, they are activated and differentiate into effector T cells. These effector T cells then proliferate and can specifically target and destroy cancer cells that display these same cryptic peptides, thereby inducing anti-tumour immunity.

Circular RNAs: Beyond Noncoding Roles

Circular RNAs are a class of RNA molecules characterized by a covalently closed loop structure, which makes them resistant to exonuclease degradationGSE210792 - GEO Accession viewer - NIH. While much of the research on RNA has focused on messenger RNA (mRNA) and its role in protein synthesis, the discovery that circRNAs can also be translated into functional peptides is a significant paradigm shiftGSE210793 - GEO Accession viewer - NIH. This finding suggests that the genome's noncoding regions might harbour a much richer repertoire of protein-coding potential than previously appreciated.

The study identifies specific circRNAs, such as circFAM53B, as potent inducers of anti-tumour immunity due to their ability to encode these cryptic antigenic peptides. This discovery has profound implications for the development of novel cancer therapies.Circular RNA vaccines expose cryptic peptides By understanding how cancer cells utilize circRNAs to generate these immune-activating peptides, researchers can explore strategies to enhance this natural defence mechanism or to develop synthetic vaccines that mimic this process.

Therapeutic Implications and Future Directions

The ability of tumour-specific circRNAs to elicit anti-tumour immunity by encoding cryptic peptides opens exciting possibilities for cancer immunotherapy. Potential therapeutic strategies could include:

* CircRNA-based Vaccines: Developing vaccines that deliver tumour-specific circRNAs or their encoded cryptic peptides to stimulate a robust anti-tumour immune response.

* Immune Checkpoint Inhibitor Combinations: Combining therapies that target circRNA-encoded peptides with existing immunotherapies, such as checkpoint inhibitors, to enhance their efficacyCircFAM53B encodes antigenic peptides a, Schematic ....

* Biomarker Development: Identifying specific circRNAs or their encoded peptides that can serve as biomarkers for early cancer detection or for predicting response to immunotherapy.

While significant progress has been made, further research is needed to fully elucidate the intricate mechanisms involved and to translate these findings into effective clinical applications.2025年3月20日—针对低突变负荷的乳腺癌患者, 我们分析了肿瘤组织中能够与人白细胞抗原I类分子(HLA-I)结合的免疫肽组, 结合全外显子测序和RNA测序, 并未鉴定出肿瘤突变 ... Understanding the precise pathways of circRNA translation, peptide processing, and T cell activation will be crucial for developing targeted and safe immunotherapies that harness the power of cryptic peptides encoded by tumour circRNAs. This research marks a pivotal moment in our understanding of cancer immunology and the multifaceted roles of RNA in health and disease.