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Inhibition of kras-derived exosomes downregulates immunosuppressive BACH2/GATA-3 expression via RIP-3 dependent

Savvas Petanidis1, Kalliopi Domvri2, Konstantinos Porpodis2

  • 1Department of Medicine, Laboratory of Medical Biology and Genetics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece; Department of Pulmonology, I.M. Sechenov First Moscow State Medical University, Moscow, 119992, Russian Federation.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|January 10, 2020
PubMed

Insights

Kras-derived exosomes promote lung cancer metastasis and immune suppression by altering chromatin remodeling and metabolism. Inhibiting these exosomes offers a promising strategy for treating chemoresistant lung cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Immunology

Background:

  • Chemoresistance and immunosuppression are significant hurdles in lung cancer treatment.
  • Lung-derived exosomes within the tumor microenvironment are linked to immune suppression and metastasis, but their precise role remains unclear.
  • Kras-derived exosomes contribute to a tumor-supportive status and immune dysfunction in lung cancer.

Purpose of the Study:

  • To investigate the role of Kras-derived exosomes in chemoresistant immunosuppression within lung cancer.
  • To elucidate how these exosomes create a metabolically sustained microenvironment.
  • To explore potential therapeutic strategies targeting Kras-derived exosomes for metastasis inhibition.

Main Methods:

  • Investigated Kras-derived exosomes' impact on chromatin remodeling genes (SMARCE1/NCOR1).
  • Assessed exosomal Kras inhibition's effect on transcription factors (BACH2/GATA-3) and metabolism (pyruvate/PKM2).
  • Evaluated carboplatin co-treatment effects on necroptosis (RIP3/TNFa) and microRNA regulators (miR-146/miR-210) in patient samples.

Main Results:

  • Kras-derived exosomes promote pre-metastatic niche formation and increase lung metastasis in mice.
  • Exosomal Kras inhibition downregulates key transcription factors and shifts metabolism, leading to a tumor-restraining status.
  • Carboplatin co-treatment induces necroptosis and alters immunosuppressive microRNA expression in metastatic lung cancer.

Conclusions:

  • Kras-derived exosomes play a multifaceted role in sustaining lung cancer immunosuppression and metastasis.
  • Targeting Kras-derived exosomes presents a novel therapeutic avenue for inhibiting metastasis, particularly in chemoresistant lung tumors.
  • Understanding exosome-mediated metabolic and immune regulation is crucial for developing effective lung cancer treatments.
Keywords:
BACH2ExosomesKrasNecroptosismiR-146/miR-210

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