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Lily Berríos-Contreras1,2,3, Matías Meza-Valenzuela2, Nelson Brown2

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Cancer cells release extracellular vesicles (EVs) that cause muscle wasting in cachexia. Understanding these EVs and their signaling pathways may lead to new cancer cachexia therapies.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Physiology

Background:

  • Cancer progression involves uncontrolled cell growth, invasion, and metastasis.
  • Cancer cachexia is a catabolic state with muscle mass loss and anorexia, driven by tumor-derived factors.
  • Extracellular vesicles (EVs) from tumors are implicated in mediating cachexia by affecting muscle cells.

Purpose of the Study:

  • To investigate the role of tumor-derived extracellular vesicles (EVs) in cancer cachexia.
  • To elucidate the cellular signaling pathways involved in tumor-muscle cell communication during cachexia.
  • To understand how EVs contribute to the varying severity of cachexia syndrome.

Main Methods:

  • Analysis of inflammatory molecules and mediators released from the tumor niche.
  • Characterization of extracellular vesicle (EV) cargoes (interleukins, microRNAs, AGE receptors).
  • Investigation of cellular signaling pathways, including NF-κB, ubiquitin-proteasome, and PI3K/AKT/mTOR.

Main Results:

  • Tumor-derived EVs exacerbate proteolysis in muscle cells, leading to skeletal muscle mass loss.
  • EVs activate signaling pathways, promoting nuclear translocation of NF-κB in muscle cells.
  • Tumor factors induce negative energy balance, oxidative stress, and expression of ubiquitin ligases (MuRF1, Atrogin-1) in muscle.

Conclusions:

  • Extracellular vesicles (EVs) play a significant role in mediating cancer cachexia by promoting muscle catabolism.
  • Further research is needed to fully understand EV-mediated tumor-muscle communication and its impact on cachexia severity.
  • Targeting EV pathways presents a potential therapeutic strategy for cancer cachexia.