Home / Fun Facts / Macromolecular machines for controlled drug delivery — ScienceDay by day

Macromolecular machines for controlled drug delivery — ScienceDay by day

Hong Kong Baptist University (HKBU) students demonstrated the design and synthesis of a sensible globular macromolecular machine car for actively controlled most cancers drug delivery, which might improve the drug’s efficacy. This world-first breakthrough offers perception to focused remedy medication reminiscent of Chlorambucil within the therapy of leukemia. The paper entitled “Higher-Generation Type III-B Rotaxane Dendrimers with Controlling Particle Size in Three-Dimensional Molecular Switching” was printed in journal Nature Communications.

All authors of the paper are from HKBU Faculty of Science. The crew contains HKBU students in Chemistry and Physics: Associate Professor Dr Ken Leung Cham-fai, Founding Kwok Yat Wai Endowed Chair of Environmental and Biological Analysis Professor Cai Zongwei and PhD pupil Kwan Chak-shing of the Department of Chemistry; Head of Department of Physics Chair Professor Michel A Van Hove and Postdoctoral Fellow Dr Zhao Rundong.

The crew reported on a collection of novel hyperbranched macromolecules with at most 15 mechanical bonds on the branching unit: mechanical bonds are a novel and thrilling class of non-covalent bonds just like acquainted chains and hooks, for instance. These macromolecules can induce an total extension-contraction molecular movement through collective and controllable molecular back-and-forth shuttling, offering the power to encapsulate drug molecules and launch them actively by acidic stimuli.

Dr Ken Leung, who led the analysis, mentioned that in present leukemia therapy, medication are delivered to kill leukemia cells that could be current within the blood and bone marrow. The quantity of medicine launched to kill the free-floating most cancers cells can’t be successfully controlled, nevertheless. He mentioned the 15 mechanical bonds resemble 15 mechanical arms that actively management the delivery and appropriate quantity of medicine launched to focused most cancers cells.

Dr Leung added that this good materials combines molecular machines and dendrimers with a brand new breakthrough in synthesis in addition to controlled and energetic drug launch. With its complexity and dimension, this artificial molecule resembles a small virus. Due to the comparatively low toxicity of this good globular molecular car, it may possibly additionally function a possible splendid long-term drug delivery molecular machine submerged within the human physique. The molecular plenty of those new macromolecules have been characterised by mass spectrometry, and their chemical buildings and bodily properties have been additionally verified with supercomputer simulations.

Kwan Chak-shing, who accomplished the synthesis of macromolecules, mentioned, “I am delighted that HKBU has all I need to complete this challenging task. The syntheses of macromolecular machines are complicated whereas the intermediate compounds require the formation of mechanical bonds followed by careful purification and characterisation. I look forward to seeing more creative research work done in HKBU.”

Molecular machines are assembled with their molecular counterparts which can be conscious of particular stimuli (enter) and produce mechanical actions (output). Rotaxane dendrimers are molecular interlocked molecules that mix hyperbranched macromolecules with molecular machines. Among numerous forms of rotaxane dendrimer, kind III-B possesses probably the most sophisticated molecular construction and reveals the most important extension-contraction properties. The breakthrough within the synthesis and the management of particle dimension of higher-generation rotaxane dendrimers might give scientists an perception to develop extra subtle molecular machines to be utilized in purposeful supplies and nanotechnology, such because the delivery of medicine or biomolecules.

This analysis is principally funded by the Area of Excellence Scheme of the University Grants Committee of Hong Kong, a Collaborative Research Fund of the Hong Kong Research Grants Council, and the HKBU Institute of Creativity which is supported by the Hung Hin Shiu Charitable Foundation.

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Materials supplied by Hong Kong Baptist University. Note: Content could also be edited for model and size.

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