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NRP1 transport of cancer therapeutics mediated by tumor-penetrating peptides.
Drugs of the Future 2017 Februrary
Whereas uptake of low molecular weight agents is generally inhibited in tumors due to high interstitial pressure, tumor uptake of macromolecules is increased due to enhanced permeability and retention (EPR). Small molecule drugs alone or incorporated in nanoparticles (NP) have largely been dependent on such physical tumor uptake (passive) for therapeutic activity. Although passive targeted NP such as Stealth Liposomal Doxorubicin (Doxil ®) are effective with improved safety, drug delivery to tumors is still significantly limited. To improve tumor delivery and efficacy, tumor-penetrating peptides (TPP), which contain sequences that target the tumor and activate the neuropilin-1 receptor (NRP1), have either been co-administered with or conjugated to both small and large therapeutic molecules. In this review, we will discuss TPP-mediated therapeutics which target the NRP1 transport system of tumors.
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