{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T19:24:53Z","timestamp":1791833093019,"version":"4.3.4"},"reference-count":64,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T00:00:00Z","timestamp":1748995200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Deutsche Forschungsgemeinschaft","award":["SCHA-677\/15-1"],"award-info":[{"award-number":["SCHA-677\/15-1"]}]},{"name":"Deutsche Forschungsgemeinschaft","award":["DAAD-91832744"],"award-info":[{"award-number":["DAAD-91832744"]}]},{"name":"German Cluster of Excellence Precision Medicine in Chronic Inflammation","award":["SCHA-677\/15-1"],"award-info":[{"award-number":["SCHA-677\/15-1"]}]},{"name":"German Cluster of Excellence Precision Medicine in Chronic Inflammation","award":["DAAD-91832744"],"award-info":[{"award-number":["DAAD-91832744"]}]},{"name":"German Academic Exchange Service","award":["SCHA-677\/15-1"],"award-info":[{"award-number":["SCHA-677\/15-1"]}]},{"name":"German Academic Exchange Service","award":["DAAD-91832744"],"award-info":[{"award-number":["DAAD-91832744"]}]},{"name":"Medical Faculty of Christian-Albrechts-University","award":["SCHA-677\/15-1"],"award-info":[{"award-number":["SCHA-677\/15-1"]}]},{"name":"Medical Faculty of Christian-Albrechts-University","award":["DAAD-91832744"],"award-info":[{"award-number":["DAAD-91832744"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Tumor cell heterogeneity, e.g., in stroma-rich pancreatic ductal adenocarcinoma (PDAC), includes a differential metabolism of lactate. While being secreted as waste product by most cancer cells characterized by the glycolytic Warburg metabolism, it is utilized by a subset of highly malignant cancer cells running the reverse Warburg metabolism. Key drivers of lactate transport are the carrier proteins SLC16A1 (import\/export) and SLC16A3 (export). Expression and function of both carriers are controlled by the chaperone Basigin (BSG), which itself is functionally controlled by the transmembrane protease serine 11B (TMPRSS11B). In this study we explored the impact of TMPRSS11B on the phenotype of PDAC cells under reverse Warburg conditions. Amongst a panel of PDAC cell lines, Panc1 and BxPc3 cells were identified to express TMPRSS11B at a high level, whilst other cell lines such as T3M4 did not. ShRNA-mediated TMPRSS11B knock-down in Panc1 and BxPc3 cells enhanced lactate import through SLC16A1, as shown by GFP\/iLACCO1 lactate uptake assay, whereas TMPRSS1B overexpression in T3M4 dampened SLC16A1-driven lactate uptake. Moreover, knock-down and overexpression of TMPRSS11B differentially impacted proliferation and chemoresistance under reverse Warburg conditions in Panc1 or BxPc3 and T3M4 cells, respectively, as well as their stemness properties indicated by altered colony formation rates and expression of the stem cell markers Nanog, Sox2, KLF4 and Oct4. These effects of TMPRSS11B depended on both SLC16A1 and BSG as shown by gene silencing. Immunohistochemical analysis revealed a reciprocal expression of TMPRSS11B and BSG together with SLC16A1 in some areas of tumor tissues from PDAC patients. Those regions exhibiting low or no TMPRSS11B expression but concomitant high expression of SLC16A1 and BSG revealed greater amounts of KLF4. In contrast, other tumor areas exhibiting high expression of TMPRSS11B together with BSG and SLC16A1 were largely negative for KLF4 expression. Thus, the differential expression of TMPRSS11B adds to metabolic heterogeneity in PDAC and its absence supports the reverse Warburg metabolism in PDAC cells by the enhancement of BSG-supported lactate uptake through SLC16A1 and subsequent phenotype alterations towards greater stemness.<\/jats:p>","DOI":"10.3390\/ijms26115398","type":"journal-article","created":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T10:10:16Z","timestamp":1749031816000},"page":"5398","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Transmembrane Protease Serine 11B Modulates Lactate Transport Through SLC16A1 in Pancreatic Ductal Adenocarcinoma\u2014A Functional Link to Phenotype Heterogeneity"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-6610-4726","authenticated-orcid":false,"given":"Dinara","family":"Baiskhanova","sequence":"first","affiliation":[{"name":"Institute of Experimental Cancer Research, UKSH Campus Kiel, Arnold-Heller-Str. 3, Bldg. U30, 24105 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maike","family":"Menzel","sequence":"additional","affiliation":[{"name":"Department of Pharmacy, Christian-Albrechts-University Kiel, 24118 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0640-9256","authenticated-orcid":false,"given":"Claudia","family":"Geismann","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology, Carl-von-Ossietzky University Oldenburg, Ammerl\u00e4nder Heerstra\u00dfe 114-118, 26129 Oldenburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6989-8002","authenticated-orcid":false,"given":"Christoph","family":"R\u00f6cken","sequence":"additional","affiliation":[{"name":"Department of Pathology, Christian-Albrechts-University Kiel, Arnold-Heller-Str. 3, Bldg. U33, 24105 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5912-6626","authenticated-orcid":false,"given":"Eric","family":"Beitz","sequence":"additional","affiliation":[{"name":"Department of Pharmacy, Christian-Albrechts-University Kiel, 24118 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6582-0083","authenticated-orcid":false,"given":"Susanne","family":"Sebens","sequence":"additional","affiliation":[{"name":"TriBanK, University Hospital Schleswig-Holstein, Campus Kiel, Arnold-Heller-Str. 3, Bldg. U30, 24105 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4697-556X","authenticated-orcid":false,"given":"Anna","family":"Trauzold","sequence":"additional","affiliation":[{"name":"Institute of Experimental Cancer Research, UKSH Campus Kiel, Arnold-Heller-Str. 3, Bldg. U30, 24105 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6936-9090","authenticated-orcid":false,"given":"Heiner","family":"Sch\u00e4fer","sequence":"additional","affiliation":[{"name":"Institute of Experimental Cancer Research, UKSH Campus Kiel, Arnold-Heller-Str. 3, Bldg. U30, 24105 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,4]]},"reference":[{"key":"ref_1","first-page":"669","article-title":"Cancer metabolism: Looking forward","volume":"10","author":"Chandel","year":"2021","journal-title":"Nat. Rev. Cancer"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Tong, Y., Gao, W.Q., and Liu, Y. (2020). Metabolic heterogeneity in cancer: An overview and therapeutic implications. Biochim. Biophys. Acta Rev. 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