Greasy GLUT1 maintains glioblastoma malignancy

Area of Science:

• Biochemistry
• Cell Biology
• Oncology

Background:

• Cancer cells exhibit high glucose uptake to fuel rapid proliferation.
• The precise mechanisms regulating glucose transporter localization and function in cancer remain incompletely understood.

Purpose of the Study:

• To investigate the role of palmitoylation in regulating glucose transporter GLUT1 function in glioblastoma.
• To elucidate the specific enzyme responsible for GLUT1 palmitoylation and its impact on cancer cell metabolism and growth.

Main Methods:

• Utilized biochemical assays to detect and analyze protein palmitoylation.
• Employed cell culture models of glioblastoma to assess the effects of DHHC9 and GLUT1 manipulation.
• Investigated the impact of altered GLUT1 palmitoylation on cellular processes like glycolysis and proliferation.

Main Results:

• Demonstrated that palmitoyl transferase DHHC9 directly palmitoylates glucose transporter GLUT1 at cysteine residue 207.
• Showed that DHHC9-mediated GLUT1 palmitoylation is essential for maintaining GLUT1 at the plasma membrane.
• Confirmed that GLUT1 palmitoylation by DHHC9 enhances glucose uptake, glycolysis, proliferation, colony formation, and tumorigenicity in glioblastoma cells.

Conclusions:

• DHHC9-mediated palmitoylation of GLUT1 is a critical mechanism supporting the metabolic demands of glioblastoma.
• Targeting GLUT1 palmitoylation represents a potential therapeutic strategy for inhibiting cancer growth.