Amino Acid Transporters on the Guard of Cell Genome and Epigenome

Area of Science:

• Oncology
• Cancer Metabolism
• Redox Biology

Background:

• Tumorigenesis is characterized by metabolic reprogramming, often leading to increased reactive oxygen species (ROS).
• Elevated ROS levels damage macromolecules, causing genomic instability and promoting tumor evolution.
• Deregulated amino acid uptake is a hallmark of cancer metabolism, influencing cell survival and redox homeostasis.

Purpose of the Study:

• To review the critical role of amino acid transporters in maintaining tumor antioxidant systems and genome integrity.
• To explore amino acid transporters as potential therapeutic targets in cancer.
• To discuss their utility as tools for tumor imaging.

Main Methods:

• Literature review summarizing current research on cancer metabolism, ROS, and amino acid transporters.
• Analysis of the mechanisms by which amino acid uptake influences cellular redox state and antioxidant defenses.
• Discussion of therapeutic and diagnostic applications of targeting amino acid transporters.

Main Results:

• Amino acid transporters are crucial for regulating intracellular glutathione (GSH) levels, a key antioxidant.
• They modulate endoplasmic reticulum stress, unfolded protein response signaling, and mTOR-mediated antioxidant defenses.
• Amino acid transporters contribute to epigenetic adaptations enabling tumor cells to cope with oxidative stress.

Conclusions:

• Amino acid transporters play a vital role in defending the tumor antioxidant system and preserving genome integrity.
• Targeting amino acid transporters presents a promising strategy for cancer therapy.
• These transporters also hold potential as biomarkers for tumor imaging.