SLC16A13 expression linked to malignant progression in glioma
The authors examined SLC16A13 in glioma using patient cohorts, cell‑line knockdown, and mouse xenografts. High tumor expression correlated with adverse molecular features and poorer survival, while silencing the transporter reduced proliferation, migration and tumor growth and altered lactate and ketone‑body metabolism.
Study and findings
Using TCGA data and a West China Hospital cohort, the investigators found that SLC16A13 mRNA was markedly higher in glioma tissue than in non‑tumor brain and that high expression correlated with WHO grade IV, IDH‑wildtype status, TERT promoter mutation, and reduced overall and progression‑free survival (HR≈1.6). In vitro, lentiviral shRNA‑mediated knockdown of SLC16A13 in U251 and U373 glioma cells decreased cell proliferation, colony formation and wound‑healing migration, and increased apoptotic cell fractions. Subcutaneous xenografts of knockdown cells grew more slowly and displayed a lower Ki‑67 index. Metabolically, SLC16A13 depletion caused intracellular accumulation of lactate (≈1.9‑fold) and pyruvate (≈2.3‑fold), raised the lactate‑to‑pyruvate ratio by 32 % and lowered the β‑hydroxybutyrate‑to‑acetoacetate ratio by 28 %, indicating disrupted monocarboxylate transport and altered redox balance.
Clinical interpretation
The data suggest that SLC16A13 contributes to the metabolic flexibility that glioma cells exploit for rapid growth. Its up‑regulation in high‑grade, IDH‑wildtype tumors and association with poorer survival imply that the transporter may serve as a prognostic biomarker. The in‑vitro and in‑vivo experiments demonstrate that reducing SLC16A13 impairs proliferative capacity and modifies lactate and ketone‑body handling, supporting the concept that targeting monocarboxylate transport could influence tumor metabolism. However, the study does not provide evidence that pharmacologic inhibition of SLC16A13 would be safe or effective in patients.
Limitations and open questions
The work is limited to cell lines and a mouse xenograft model; human tumor biology may differ, especially regarding the tumor microenvironment and blood‑brain barrier. The metabolic measurements are restricted to a few metabolites, leaving broader pathway effects unexplored. It remains unclear whether SLC16A13 inhibition would synergize with existing therapies or affect normal brain tissue. Future studies should assess selective inhibitors in orthotopic glioma models and evaluate clinical relevance in larger, prospectively collected patient cohorts.
Source
PMID: 42925432