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Pre-Conditioning the Airways of Mice with Bleomycin Increases the Efficiency of Orthotopic Lung Cancer Cell Engraftment
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Modified bleomycin disaccharides exhibiting improved tumor cell targeting.

Manikandadas M Madathil1, Chandrabali Bhattacharya, Zhiqiang Yu

  • 1Center for Bioenergetics, Biodesign Institute, and Department of Chemistry and Biochemistry, Arizona State University , Tempe, Arizona 85287, United States.

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Bleomycins (BLMs) target tumor cells via their carbohydrate structure. Researchers synthesized BLM analogues, finding some selectively target cancer cells and improve dye uptake for better chemotherapy drug delivery.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Medicinal Chemistry

Background:

  • Bleomycins (BLMs) are anticancer antibiotics with tumor-targeting properties.
  • Tumor cell selectivity is attributed to the carbohydrate moiety, specifically the mannose carbamoyl group.
  • Previous work showed BLM saccharides deliver conjugated dyes into cancer cells.

Purpose of the Study:

  • To investigate the role of the carbamoyl moiety in BLM tumor cell recognition and uptake.
  • To identify novel BLM analogues with enhanced tumor cell targeting and internalization.
  • To develop tools for understanding BLM-cancer cell interaction mechanisms.

Main Methods:

  • Synthesized a library of seven disaccharide-cyanine dye (Cy5) conjugates, structurally analogous to BLM disaccharides.
  • Modified the position, orientation, and substitution of the carbamoyl group in these analogues.
  • Evaluated the tumor cell selectivity and internalization efficiency of these compounds in matched tumor and normal cell lines.

Main Results:

  • Several novel disaccharide-Cy5 conjugates demonstrated tumor cell selectivity.
  • Some analogues showed 2-4 fold increased internalization efficiency compared to the natural BLM disaccharide.
  • The structural modifications of the carbamoyl group influenced selectivity and uptake.

Conclusions:

  • The carbamoyl moiety's structure is critical for BLM's tumor cell recognition and uptake.
  • Modified BLM analogues can achieve enhanced tumor cell targeting and dye delivery.
  • These findings provide a basis for developing more effective anticancer agents and drug delivery systems.