Heating targeted cancer drugs increases uptake in tumour cells

Heating targeted cancer drugs increases uptake in tumour cells
Liposomes

Manchester scientists have found that gentle heating of targeted nano-sized drug parcels more effectively in deliver them to tumour cells – resulting in an improvement in survival rates.

One of the clinically-established methods for the delivery of cancer chemotherapy drugs has been to package the drug inside nano-sized containers, known as liposomes. This allows the drug to more effectively localise into and reduces side-effects by limiting drug-infused liposome uptake in .

The effectiveness of these liposomes has been further improved by engineering them to contain molecules (monoclonal antibodies) on their surface that allow them to better target cancer cells in combination to making them temperature-sensitive so that they release their therapeutic drug content upon mild heating.

Researchers from the Nanomedicine Laboratory at The University of Manchester – part of the Manchester Cancer Research Centre – looked at the benefits of combining both active targeting and temperature-triggered release.

Professor Kostas Kostarelos, who led the research, said: "We have previously seen promising results from this combination approach on a petri dish, but no study had yet investigated its potential in living tissue."

The team compared liposomes with and without the ability to actively target . They found that in combination with mild heating, the actively targeted liposomes showed greater uptake in in mice than those without targeting ability.

This resulted in a moderate improvement in the animals' survival.

"We have successfully developed heat-activated and antibody-targeted to show that they are chemically and structurally stable. This approach may help us develop novel mechanistic strategies to improve targeted drug delivery and release within tumour tissue, while better sparing normal cells," added Professor Kostarelos.


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More information: Zahraa S. Al-Ahmady, Olivier Chaloin, Kostas Kostarelos, "Monoclonal antibody-targeted, temperature-sensitive liposomes: In vivo tumor chemotherapeutics in combination with mild hyperthermia," Journal of Controlled Release, Volume 196, 28 December 2014, Pages 332-343, ISSN 0168-3659, dx.doi.org/10.1016/j.jconrel.2014.10.013.
Journal information: Journal of Controlled Release

Citation: Heating targeted cancer drugs increases uptake in tumour cells (2015, February 11) retrieved 23 May 2019 from https://medicalxpress.com/news/2015-02-cancer-drugs-uptake-tumour-cells.html
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