ArticleProceedings of the National Academy of Sciences of the United States of America2025
Signal peptide-independent secretion of keratin-19 by pancreatic cancer cells.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Nuclear KRT19 links the NF-κB-FSCN1 signaling to gastric cancer metastasis.Communications biology · 2026Article
- Clinical and prognostic implications of KRT19 expression in pancreatic ductal adenocarcinoma.Translational cancer research · 2026Article
- Overcoming CXCR4-Mediated T-Cell Exclusion Potentiates Antitumor Cytotoxicity in Fibrolamellar Carcinoma.Gastroenterology · 2026Article
- Signal peptide-independent secretion of keratin-19 by pancreatic cancer cells.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
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10 authors.
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Abstract
The exclusion of T cells causes immune escape of pancreatic ductal adenocarcinoma (PDA). T cell exclusion is mediated by the interaction between CXCR4 on T cells and its ligand, CXCL12, which is complexed to keratin-19 (KRT19) on the surface of PDA cells. KRT19 secretion by PDA cells is essential to this process but is unusual because KRT19 lacks an endoplasmic reticulum (ER)-directing signal peptide (SP). By using biotinylation by an ER-restricted TurboID system and a split-GFP assay in PDA cells, we demonstrate that KRT19 enters the ER via its "head" domain. Additionally, KRT19 is shown to interact with the signal recognition particle and its secretion is sensitive to canonical protein secretion inhibitors. In vivo, mouse tumors formed with ER-TurboID-expressing PDA cells contain biotinylated KRT19. In contrast, keratin-8 (KRT8), which colocalizes with KRT19 on the surface of PDA cells, does not enter the ER. Rather, KRT8 is externalized via secretory autophagy possibly in a complex with KRT19. Thus, despite lacking a classical SP, PDA cells secrete KRT19 to capture CXCL12 and protect against immune attack.
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