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Antitumor Allium Sulfides.

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New sulfides from onions, Welsh onions, and garlic show potential as anti-cancer agents. Onionin A1 effectively controlled tumor growth and metastasis by activating the immune system, suggesting its use in adjuvant cancer therapy.

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Area of Science:

  • Phytochemistry and Natural Products
  • Immunology
  • Oncology

Background:

  • Onions, Welsh onions, and garlic contain various sulfur compounds.
  • Certain sulfur compounds, particularly thiolane-type sulfides, have demonstrated immunomodulatory properties.
  • Tumor progression is often associated with suppressed anti-tumor immune responses.

Purpose of the Study:

  • To isolate and characterize novel sulfur compounds from Allium species.
  • To evaluate the in vitro and in vivo anti-tumor potential of these compounds.
  • To investigate the underlying mechanisms of action, focusing on macrophage activation and immune system modulation.

Main Methods:

  • Isolation and structural elucidation of novel sulfides from onion, Welsh onion, and garlic extracts.
  • In vitro assessment of sulfide effects on M2-activated macrophages.
  • In vivo studies using osteosarcoma and ovarian cancer mouse models to evaluate tumor proliferation and metastasis.
  • Analysis of immune system activation as a mechanism for anti-tumor effects.

Main Results:

  • Discovery of new thiolane-type (onionins), thiabicyclic-type (welsonins), and acyclic-type (garlicnins) sulfides.
  • Acetone extracts containing these sulfides inhibited M2-activated macrophages.
  • Onionin A1 significantly suppressed tumor proliferation and metastasis in mouse models.
  • Onionin A1 demonstrated anti-tumor effects by reversing the immune system towards an anti-tumor state.

Conclusions:

  • Onionin A1 is a potent agent for controlling tumors in vitro and in vivo.
  • The anti-tumor effects of onionin A1 are mediated by the activation of the anti-tumor immune system.
  • Onionin A1 holds promise as an adjuvant therapy for osteosarcoma, ovarian cancer, and other malignancies.
  • Further pharmacological research is warranted to develop these natural compounds as anti-cancer agents.