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Endogenous glutamine decrease is associated with pancreatic cancer progression.

Cecilia Roux1,2, Chiara Riganti3, Sammy Ferri Borgogno1,2

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Pancreatic cancer cells consume more glutamine, leading to lower blood glutamine levels as tumors grow. This blood glutamine reduction can serve as a novel biomarker for early pancreatic ductal adenocarcinoma (PDAC) detection.

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PDACamino acidcirculating biomarkersdiagnosispancreatitis

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Area of Science:

  • Biochemistry
  • Oncology
  • Metabolomics

Background:

  • Pancreatic ductal adenocarcinoma (PDAC) is a leading cause of cancer mortality.
  • Early detection biomarkers are crucial for improving PDAC patient outcomes.
  • Altered glutamine metabolism is a known hallmark of PDAC.

Purpose of the Study:

  • To develop a method for evaluating blood glutamine consumption in PDAC mouse models.
  • To assess the potential of blood glutamine levels as a diagnostic biomarker for PDAC.

Main Methods:

  • Quantified in vitro glutamine uptake in PDAC cells using Mass Spectrometry (MS).
  • Measured in vivo blood glutamine levels in PDAC mouse models using High-Performance Liquid Chromatography (HPLC) and/or MS.
  • Assessed enzyme activity in glutamine metabolic pathways.

Main Results:

  • PDAC cells exhibited higher in vitro glutamine uptake compared to controls.
  • Blood glutamine levels decreased progressively with PDAC tumor progression.
  • Reduced blood glutamine was specific to PDAC and not associated with inflammation or diabetes.
  • Increased branched-chain amino acids (BCAA) were observed in PDAC models.

Conclusions:

  • Glutamine uptake is a measurable characteristic of PDAC cells in vitro and in vivo.
  • Decreased circulating glutamine levels correlate with PDAC tumor growth.
  • Blood glutamine reduction is a promising novel biomarker for PDAC diagnosis and prognosis.