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Loss of lactate dehydrogenase B (LDHB) in cancer-associated fibroblasts (CAFs) promotes breast cancer metastasis. This metabolic shift enhances tumor cell spread by increasing inflammatory signals from CAFs.

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Area of Science:

  • Oncology
  • Cancer Biology
  • Metabolic Reprogramming

Background:

  • Cancer-associated fibroblasts (CAFs) are crucial in the tumor microenvironment.
  • CAFs undergo metabolic reprogramming that influences cancer cell behavior.
  • Understanding CAF metabolic shifts is key to developing anti-cancer strategies.

Purpose of the Study:

  • To investigate the role of lactate dehydrogenase B (LDHB) in CAFs.
  • To elucidate the mechanisms by which LDHB loss affects breast cancer metastasis.
  • To identify potential therapeutic targets for limiting cancer spread.

Main Methods:

  • Analysis of LDHB expression in CAFs.
  • Assessment of metabolic changes in LDHB-deficient CAFs.
  • Investigation of signaling pathways, including p38 and CXCL8.
  • Evaluation of the impact on breast cancer cell metastasis in vitro and in vivo.

Main Results:

  • Loss of LDHB in CAFs drives a metabolic shift towards an inflammatory phenotype.
  • LDHB deficiency leads to lactate accumulation and disrupted DUSP16-p38 interaction.
  • Sustained p38 activation results in increased CXCL8 secretion by CAFs.
  • CAF-derived CXCL8 significantly enhances breast cancer cell metastasis.

Conclusions:

  • LDHB is a critical metabolic regulator in CAFs, influencing breast cancer progression.
  • Metabolic reprogramming of CAFs promotes an inflammatory, pro-metastatic phenotype.
  • Targeting LDHB in CAFs represents a potential therapeutic strategy to inhibit cancer metastasis.