Inhibiting both proline biosynthesis and lipogenesis synergistically suppresses tumor growth

Area of Science:

• Biochemistry
• Metabolic Engineering
• Oncology

Background:

• Cancer cells frequently experience hypoxia, leading to metabolic reprogramming.
• Identifying effective therapeutic targets within these hypoxia-driven metabolic pathways remains a challenge.

Purpose of the Study:

• To develop a novel tool for calculating electron dissipation in metabolic transformations.
• To construct an electron balance model for central carbon metabolism to understand metabolic plasticity under hypoxia.
• To identify potential therapeutic targets by analyzing hypoxia-associated metabolic reprogramming.

Main Methods:

• Development of a computational tool to quantify electron dissipation in metabolic reactions.
• Construction of an electron balance model for central carbon metabolism.
• Analysis of metabolic reprogramming, specifically glutamine metabolism, under hypoxic conditions.
• Inhibition studies targeting proline biosynthesis and lipogenesis in cancer cells.

Main Results:

• The electron balance model accurately depicts metabolic plasticity in cancer cells under hypoxia.
• Glutamine metabolism is reprogrammed to support lipid and proline biosynthesis, serving as an alternative electron sink.
• Simultaneous inhibition of proline biosynthesis and lipogenesis synergistically suppressed cancer cell proliferation.
• Combined inhibition also reduced in vivo tumor formation.

Conclusions:

• The developed electron balance model provides insights into hypoxia-rewired cancer metabolism.
• Targeting both proline biosynthesis and lipogenesis represents a promising synergistic strategy to inhibit cancer growth under hypoxia.
• This approach offers a valuable tool for identifying novel therapeutic targets in cancer metabolism research.