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July 26, 2026Discovery MedicineOpen Access

GCN2 Activation Promotes PD-L1 Expression and Survival of RPMI-8226 Multiple Myeloma Cells: An In Vitro Study Under Arginine Deprivation

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Authors

JPJing PengYJYongqing JiaLZLina Zhang

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Overview

In vitro study shows GCN2 activation boosts PD-L1 levels and survival in multiple myeloma cells under nutrient stress, suggesting new therapeutic targets.

Key Points

  • This study aims to explore how GCN2 affects cell survival and PD-L1 expression in multiple myeloma cells during amino acid deficiency.
  • Cultured RPMI-8226 multiple myeloma cells under arginine deprivation to simulate metabolic stress.
  • Evaluated GCN2 activation and downstream signaling via Western blotting and assessed cell viability with CCK-8 assays and flow cytometry.
  • Investigated immune effects in a co-culture system alongside PBMCs and validated findings with selective inhibitors.
  • Arginine deprivation activated the GCN2–ATF4–CHOP axis, increasing cell survival and reducing apoptosis.
  • Inhibition of GCN2 via GCN2iB led to decreased cell viability and increased apoptosis.
  • GCN2 activation upregulated PD-L1 expression, which impaired T-cell activation, evidenced by reduced CD69/CD25 and IFN-γ levels.

Cite This Study

Peng et al. (2026) studied this question.

synapsesocial.com/papers/6a65a3a3d3aea3239cd76ab5https://doi.org/10.24976/discov.med.202638210.177
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Abstract 1691 Differential Response of GCN2 eIF2 Kinase to Specific Amino Acid Limitations in Prostate Cancer2024
  2. 2Abstract 450: GCN2 protects cancer cells from hypertranslation and metabolic crisis2024
  3. 3GCN1 couples GCN2 to ribosomal state to initiate amino acid response pathway signaling2025
  4. 4Elevated Polyamine Metabolism Activates Fibroblasts via GCN2 Activation and Generates Senescent Fibroblasts to Promote Tumor Formation and Progression2025 · 3 citations
  5. 5Abstract 3080: Activation of mTORC2/Akt is amplified during glutamine starvation and is mediated by GCN22024 · 1 citations