American Association for Cancer Research
15357163mct170276-sup-181097_2_supp_4136578_ksfnd5.png (32.25 kB)

Figure S6 from Vessel-Targeted Chemophototherapy with Cationic Porphyrin-Phospholipid Liposomes

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posted on 2023-04-03, 15:48 authored by Dandan Luo, Jumin Geng, Nasi Li, Kevin A. Carter, Shuai Shao, G. Ekin Atilla-Gokcumen, Jonathan F. Lovell

Body mass of mice receiving different treatments with PoP liposomes. 5 mg/kg liposomal Dox or equivalent, laser treatment was initiated 15 min post administration at 200 mW/cm2 for 8.3 min (100 J/cm2). Mean{plus minus}s.d. for n=5.



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Cationic liposomes have been used for targeted drug delivery to tumor blood vessels, via mechanisms that are not fully elucidated. Doxorubicin (Dox)-loaded liposomes were prepared that incorporate a cationic lipid; 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP), along with a small amount of porphyrin-phospholipid (PoP). Near-infrared (NIR) light caused release of entrapped Dox via PoP-mediated DOTAP photo-oxidation. The formulation was optimized to enable extremely rapid NIR light-triggered Dox release (i.e., in 15 seconds), while retaining reasonable serum stability. In vitro, cationic PoP liposomes readily bound to both MIA PaCa-2 human pancreatic cancer cells and human vascular endothelial cells. When administered intravenously, cationic PoP liposomes were cleared from circulation within minutes, with most accumulation in the liver and spleen. Fluorescence imaging revealed that some cationic PoP liposomes also localized at the tumor blood vessels. Compared with analogous neutral liposomes, strong tumor photoablation was induced with a single treatment of cationic PoP liposomes and laser irradiation (5 mg/kg Dox and 100 J/cm2 NIR light). Unexpectedly, empty cationic PoP liposomes (lacking Dox) induced equally potent antitumor phototherapeutic effects as the drug loaded ones. A more balanced chemo- and phototherapeutic response was subsequently achieved when antitumor studies were repeated using higher drug dosing (7 mg/kg Dox) and a low fluence phototreatment (20 J/cm2 NIR light). These results demonstrate the feasibility of vessel-targeted chemophototherapy using cationic PoP liposomes and also illustrate synergistic considerations. Mol Cancer Ther; 16(11); 2452–61. ©2017 AACR.

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