γ-Elemene Impairs Mitochondrial Biogenesis in Breast Cancer Cells by Upregulating GCN5-Mediated PGC-1α Acetylation

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Mitochondrial biogenesis is crucial for cancer cell metabolism and survival.
• Triple-negative breast cancer (TNBC) is an aggressive subtype with limited therapeutic options.
• γ-Elemene shows anti-tumor potential, but its mechanism in TNBC, particularly regarding mitochondria, is not well understood.

Purpose of the Study:

• To investigate the effects of γ-Elemene on mitochondrial biogenesis in TNBC cells.
• To elucidate the molecular mechanism by which γ-Elemene impacts mitochondrial function and cell viability.
• To explore the therapeutic potential of targeting mitochondrial pathways in TNBC.

Main Methods:

• Assessed cytotoxicity and mitochondrial function (membrane potential, oxidative phosphorylation, ATP production) in TNBC cell lines treated with γ-Elemene.
• Measured mitochondrial DNA content and expression of key mitochondrial genes and regulators (NRF1, TFAM, PGC-1α).
• Investigated the role of GCN5 and PGC-1α acetylation using genetic manipulation (GCN5 ablation) and molecular assays.

Main Results:

• γ-Elemene induced dose-dependent cytotoxicity and impaired mitochondrial function in TNBC cells.
• γ-Elemene suppressed mitochondrial biogenesis by downregulating NRF1 and TFAM, independent of PGC-1α levels.
• γ-Elemene upregulated GCN5, leading to PGC-1α acetylation, which was reversed by GCN5 ablation, restoring cell viability.

Conclusions:

• γ-Elemene disrupts mitochondrial biogenesis and function in TNBC through GCN5-mediated PGC-1α acetylation.
• GCN5 plays a critical role in mediating γ-Elemene's anti-cancer effects in TNBC.
• These findings offer novel insights into γ-Elemene's anti-tumor properties and suggest potential therapeutic strategies for TNBC targeting mitochondrial pathways.