Heat-guided drug delivery via thermally induced crosslinking of polymeric micelles

IF 5.9 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Sota Yamada, Eita Sasaki, Hisashi Ohno, Kenjiro Hanaoka
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Abstract

Targeted drug delivery in response to external stimuli is therapeutically desirable, but long-term drug retention at the target site after stimulation is turned off remains a challenge. Herein, we present a targeted-delivery strategy via irreversible aggregation of drug carriers in response to mild external heating. We constructed two types of polymeric micelles, DBCO-TRM and Az-TRM, having a thermo-responsive polymer shell based on N-isopropylacrylamide (NIPAAm) and incorporating alkyne and azide moieties, respectively. Upon heating at 42 °C, the micelles aggregated through hydrophobic interaction between their dehydrated shells. Further, the azide moieties of Az-TRM become exposed on the surface due to the thermally shrinkage of the shells, thereby enabling crosslinking between the two types of micelles via azide-alkyne click chemistry to form irreversible aggregates. These aggregates were efficiently accumulated at tumor sites in mice by local heating after intravenous administration of a mixture of the micelles, and were well retained after cessation of heating due to their increased size. As proof of concept, we show that delivery of doxorubicin in this heat-guided drug delivery system dramatically improved the anti-tumor effect in a mouse model after a single treatment. Our results suggest that this platform could be an efficient tool for on-demand drug delivery. Targeted drug delivery in response to external stimuli is therapeutically desirable, but long-term drug retention at the target site after stimulation is turned off remains a challenge. Here, the authors present a targeted delivery strategy via irreversible aggregation of drug carriers in response to mild external heating by constructing two types of polymeric micelles with a thermo-responsive polymer shell based on N-isopropylacrylamide and incorporating alkyne and azide moieties, respectively.

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来源期刊
Communications Chemistry
Communications Chemistry Chemistry-General Chemistry
CiteScore
7.70
自引率
1.70%
发文量
146
审稿时长
13 weeks
期刊介绍: Communications Chemistry is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the chemical sciences. Research papers published by the journal represent significant advances bringing new chemical insight to a specialized area of research. We also aim to provide a community forum for issues of importance to all chemists, regardless of sub-discipline.
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