Subtopic Deep Dive

Amino Acid Transporters in Cancer
Research Guide

What is Amino Acid Transporters in Cancer?

Amino acid transporters in cancer refer to solute carrier (SLC) family proteins like LAT1 and SLC7A11 that enable tumor cells to uptake essential amino acids such as glutamine, arginine, and cystine for metabolic reprogramming, growth, and immune evasion.

SLC transporters support cancer metabolism by facilitating glutamine influx for glutaminolysis (Hensley et al., 2013, 1225 citations) and cystine uptake for redox balance (Koppula et al., 2018, 835 citations). Overexpression of these transporters correlates with poor prognosis and therapy resistance. Approximately 10 key papers from the list address their roles, with foundational work on arginine and glutamine metabolism.

Curated Papers

Key Challenges

Why It Matters

Targeting SLC7A11/xCT disrupts redox homeostasis and nutrient dependency in tumors, offering therapeutic potential (Koppula et al., 2018). Glutamine transporters fuel biosynthesis and signaling, making them viable for clinical intervention (Hensley et al., 2013). Arginine transporter inhibition in the tumor microenvironment restores T-cell function and enhances immunotherapy (Rodríguez et al., 2004). These strategies address metabolic vulnerabilities in cancers resistant to standard treatments.

Key Research Challenges

Transporter Specificity

Distinguishing tumor-specific SLC expression from normal tissues risks off-target toxicity. Hensley et al. (2013) highlight glutamine transporter roles in both cancer and immune cells. Selective inhibitors remain underdeveloped.

Metabolic Plasticity

Cancer cells adapt to transporter blockade via alternative pathways like serine-glycine metabolism (Amelio et al., 2014, 1052 citations). Combinatorial targeting is needed. Yang et al. (2017) note glutaminolysis redundancy.

Immune Evasion Mechanisms

Arginase-producing myeloid cells deplete arginine, suppressing T-cell responses (Rodríguez et al., 2004, 1213 citations). Transporter modulation must balance tumor killing and immunity. Wu and Morris (1998) detail arginine's immune roles.

Essential Papers

Arginine metabolism: nitric oxide and beyond

Guoyao Wu, Sidney M. Morris · 1998 · Biochemical Journal · 2.8K citations

Arginine is one of the most versatile amino acids in animal cells, serving as a precursor for the synthesis not only of proteins but also of nitric oxide, urea, polyamines, proline, glutamate, crea...

The return of metabolism: biochemistry and physiology of the pentose phosphate pathway

Anna Stincone, Alessandro Prigione, Thorsten Cramer et al. · 2014 · Biological reviews/Biological reviews of the Cambridge Philosophical Society · 1.4K citations

ABSTRACT The pentose phosphate pathway ( PPP ) is a fundamental component of cellular metabolism. The PPP is important to maintain carbon homoeostasis, to provide precursors for nucleotide and amin...

Glutamine and cancer: cell biology, physiology, and clinical opportunities

Christopher T. Hensley, Ajla Wasti, Ralph J. DeBerardinis · 2013 · Journal of Clinical Investigation · 1.2K citations

Glutamine is an abundant and versatile nutrient that participates in energy formation, redox homeostasis, macromolecular synthesis, and signaling in cancer cells. These characteristics make glutami...

Arginase I Production in the Tumor Microenvironment by Mature Myeloid Cells Inhibits T-Cell Receptor Expression and Antigen-Specific T-Cell Responses

Paulo C. Rodrı́guez, David Quiceno, Jovanny Zabaleta et al. · 2004 · Cancer Research · 1.2K citations

Abstract T cells infiltrating tumors have a decreased expression of signal transduction proteins, a diminished ability to proliferate, and a decreased production of cytokines. The mechanisms causin...

Serine and glycine metabolism in cancer

Ivano Amelio, Francesca Cutruzzolà, А. Антонов et al. · 2014 · Trends in Biochemical Sciences · 1.1K citations

A perspective of polyamine metabolism

Heather Wallace, Alison V. Fraser, Alun D. Hughes · 2003 · Biochemical Journal · 920 citations

Polyamines are essential for the growth and function of normal cells. They interact with various macromolecules, both electrostatically and covalently and, as a consequence, have a variety of cellu...

Glutamine reliance in cell metabolism

Hee Chan Yoo, Ya Chun Yu, Yulseung Sung et al. · 2020 · Experimental & Molecular Medicine · 910 citations

Abstract As knowledge of cell metabolism has advanced, glutamine has been considered an important amino acid that supplies carbon and nitrogen to fuel biosynthesis. A recent study provided a new pe...

Reading Guide

Foundational Papers

Start with Wu and Morris (1998, 2775 citations) for arginine metabolism basics; Hensley et al. (2013, 1225 citations) for glutamine transport in cancer; Rodríguez et al. (2004, 1213 citations) for immune microenvironment roles.

Recent Advances

Koppula et al. (2018, 835 citations) on SLC7A11 redox functions; Lieu et al. (2020, 802 citations) and Yoo et al. (2020, 910 citations) for updated amino acid dependencies in tumors.

Core Methods

Stable isotope tracing for flux analysis (Hensley et al., 2013); transporter knockout via shRNA/CRISPR (Koppula et al., 2018); TCGA RNA-seq for prognostic correlations (Yang et al., 2017).

How PapersFlow Helps You Research Amino Acid Transporters in Cancer

Discover & Search

Research Agent uses searchPapers and exaSearch to find SLC transporter papers, revealing citationGraph clusters around Hensley et al. (2013). findSimilarPapers expands from Koppula et al. (2018) to 50+ related works on glutamine and cystine transport in cancer.

Analyze & Verify

Analysis Agent applies readPaperContent to extract transporter expression data from Rodríguez et al. (2004), then runPythonAnalysis with pandas to quantify arginase effects on T-cell markers across datasets. verifyResponse (CoVe) and GRADE grading confirm claims on SLC7A11 redox roles (Koppula et al., 2018) with statistical verification.

Synthesize & Write

Synthesis Agent detects gaps in LAT1 targeting post-glutaminase inhibitors, flags contradictions between arginine depletion studies. Writing Agent uses latexEditText, latexSyncCitations for transporter network diagrams via exportMermaid, and latexCompile for publication-ready reviews.

Use Cases

"Analyze glutamine transporter expression correlations with survival in pancreatic cancer datasets"

Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas survival curves from supplementary data) → matplotlib plots of Kaplan-Meier estimates

"Draft a review section on SLC7A11 inhibitors with citations and redox pathway figure"

Synthesis Agent → gap detection → Writing Agent → latexEditText + latexSyncCitations (Koppula 2018 et al.) + exportMermaid (transporter-glutathione diagram) → latexCompile PDF

"Find GitHub repos with code for modeling amino acid transporter flux in tumors"

Research Agent → paperExtractUrls (Yang 2017) → Code Discovery → paperFindGithubRepo → githubRepoInspect (COBRApy flux models) → exportCsv of simulation parameters

Automated Workflows

Deep Research workflow conducts systematic review of 50+ amino acid transporter papers, chaining searchPapers → citationGraph → GRADE grading for structured report on cancer targets. DeepScan applies 7-step analysis with CoVe checkpoints to verify SLC7A11 claims from Koppula et al. (2018). Theorizer generates hypotheses on transporter-immune crosstalk from Rodríguez et al. (2004).

Try Doxa for Amino Acid Transporters in Cancer Research

Frequently Asked Questions

What defines amino acid transporters in cancer?

SLC family proteins like LAT1 (SLC7A5) and SLC7A11/xCT that import glutamine, leucine, and cystine to fuel tumor anabolism and antioxidant defense (Koppula et al., 2018; Hensley et al., 2013).

What are key methods for studying these transporters?

Methods include CRISPR knockout for functional validation, radiolabeled uptake assays, and RNA-seq for expression profiling in tumors (Hensley et al., 2013; Yang et al., 2017).

What are seminal papers on this topic?

Hensley et al. (2013, 1225 citations) on glutamine transport; Koppula et al. (2018, 835 citations) on SLC7A11; Rodríguez et al. (2004, 1213 citations) on arginine depletion.

What open problems exist?

Developing tumor-selective inhibitors without toxicity; overcoming metabolic rewiring; integrating transporter targeting with immunotherapy (Amelio et al., 2014; Wu and Morris, 1998).