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Synthesis and tumor cell growth inhibitory activity of biotinylated annonaceous acetogenins

Jing-Fang Shi1, Ping Wu2, Zi-Hua Jiang3

  • 1Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China; University of Chinese Academy of Sciences, Yuquanlu 19A, Beijing 100049, China.

European Journal of Medicinal Chemistry
|December 7, 2013
PubMed

Insights

New biotinylated squamocin and bullatacin derivatives show enhanced potency and selectivity for targeted delivery to tumor cells overexpressing biotin receptors. Compound 16 demonstrates superior activity and selectivity against specific cancer cell lines.

Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Cancer Biology

Background:

  • Targeted drug delivery aims to improve cancer treatment efficacy by selectively targeting tumor cells.
  • Biotin receptors are overexpressed on certain tumor cells, presenting a potential target for drug delivery.
  • Squamocin and bullatacin are natural products with cytotoxic properties that can be modified for targeted delivery.

Purpose of the Study:

  • To synthesize novel biotinylated derivatives of squamocin and bullatacin.
  • To evaluate the in vitro cytotoxicity and selectivity of these derivatives against cancer cells with varying biotin receptor expression levels.
  • To identify structure-activity relationships for optimized targeted drug design.

Main Methods:

  • Synthesis of nineteen biotinylated squamocin and bullatacin derivatives.
  • In vitro cytotoxicity assays using L1210 (biotin receptor non-overexpressed), 4T1, and P815 (biotin receptor overexpressed) tumor cell lines.
  • Structure-activity relationship (SAR) analysis to determine optimal biotinylation sites and linker effects.

Main Results:

  • Most derivatives retained similar cytotoxicity against non-overexpressing cells compared to parent compounds.
  • Several derivatives exhibited significantly enhanced potency and selectivity against biotin receptor-overexpressing 4T1 and P815 cells.
  • Compound 16 (15,28-di-O-(6-biotinylamidohexanoyl)squamocin) was the most potent, showing 10x and 26x higher activity against 4T1 and P815 cells, respectively.
  • Compound 16 demonstrated 6x and 15x greater selectivity over L1210 cells for 4T1 and P815 cells, respectively.
  • SAR analysis indicated distinct preferred biotinylation sites for squamocin and bullatacin, influenced by linker presence.

Conclusions:

  • Biotinylation of squamocin and bullatacin can lead to derivatives with improved targeted delivery and efficacy against specific tumors.
  • Compound 16 represents a promising candidate for further development in targeted cancer therapy.
  • The preferred site for biotinylation is crucial for optimizing the activity and selectivity of these cytotoxic agents.
Keywords:
Biotinylated annonaceous acetogeninsBiotin–bullatacin conjugatesBiotin–squamocin conjugatesCytotoxicityTumor-targeting drug delivery

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