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Targeting a genetically engineered elastin-like polypeptide to solid tumors by local hyperthermia.

D E Meyer¹, G A Kong, M W Dewhirst

¹Department of Biomedical Engineering, Duke University, Durham, NC 27708-0281, USA.

Cancer Research

|March 14, 2001

Summary

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Researchers developed elastin-like polypeptides (ELPs) for targeted drug delivery. These biopolymers aggregate upon heating, increasing drug concentration in tumors by twofold when combined with hyperthermia.

Area of Science:

Biotechnology
Polymer Science
Drug Delivery Systems

Background:

Elastin-like polypeptides (ELPs) are biopolymers known for their inverse temperature phase transition.
ELPs transition from soluble to aggregated states above a specific temperature (T1).
This property suggests potential for thermally triggered applications.

Purpose of the Study:

To investigate the use of ELPs conjugated to drugs for thermally targeted drug delivery to solid tumors.
To engineer ELPs with a transition temperature (T1) suitable for hyperthermia-based targeting.
To evaluate the in vivo efficacy of thermally responsive ELPs in enhancing tumor drug localization.

Main Methods:

Synthesis of a thermally responsive ELP (T1=41°C) and a control ELP in E. coli.

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In vivo studies using fluorescence videomicroscopy and radiolabel distribution in mice bearing human ovarian (SKOV-3) and glioma (D-54MG) tumors.

Application of localized hyperthermia to assess targeted delivery of the responsive ELP.

Main Results:

The thermally responsive ELP demonstrated approximately a twofold increase in tumor localization with hyperthermia compared to without.
Aggregation of the responsive ELP was observed within the heated tumor microvasculature.
Successful in vivo demonstration of thermally triggered ELP aggregation at a specific temperature.

Conclusions:

Engineered ELPs can undergo phase transitions in vivo, enabling thermally targeted drug delivery.
Exploiting ELP phase transition-induced aggregation offers a novel strategy for polymer-drug conjugates in solid tumors.
This approach enhances drug localization in tumors through localized hyperthermia.