Targeting mitochondrial citrate transport in breast cancer cell lines

Area of Science:

• Biochemistry
• Cancer Metabolism
• Molecular Biology

Background:

• Lipogenesis is crucial for cancer metabolism, with targets like ACLY and fatty acid synthase being explored for cancer therapy.
• The role of citrate transport protein (CTP) in cancer metabolism and cell survival remains largely unknown.

Purpose of the Study:

• To investigate the role of citrate transport protein (CTP) in breast cancer metabolism and cell survival.
• To compare the effects of CTP inhibition with ATP-citrate lyase (ACLY) inhibition in breast cancer cells.

Main Methods:

• Chemical inhibition of CTP.
• siRNA-based inhibition of CTP and ACLY.
• Assessment of cytoplasmic citrate levels, cell viability, cell cycle, autophagy, and apoptosis.
• Evaluation of effects on normal mammary epithelial MCF-10A cells.

Main Results:

• Chemical inhibition of CTP reduced cytoplasmic citrate and breast cancer cell viability.
• siRNA-based inhibition of CTP showed minimal effects on cytoplasmic citrate and cell viability.
• ACLY inhibition was more effective than CTP inhibition in reducing cytoplasmic citrate and cell viability.
• Neither CTP nor ACLY inhibition induced cell cycle arrest or autophagy.
• Apoptosis was only slightly induced by CTP or ACLY inhibition.
• No growth inhibitory effects were observed in normal MCF-10A cells.

Conclusions:

• Chemical inhibition of CTP impacts breast cancer cell viability, but siRNA-based inhibition is less effective.
• ACLY is a more potent target than CTP for inhibiting lipogenesis and reducing breast cancer cell viability.
• CTP and ACLY inhibition primarily induce apoptosis slightly, without affecting cell cycle or autophagy, and spare normal cells.