Contra el cáncer eficacia de la terapia fotodinámica con nanopartículas orientada por cáncer de pulmón
Summary
Photodynamic therapy (PDT) is an alternative choice for lung cancer treatment. To increase the therapeutic effect of PDT, lung cancer-targeted nanoparticles combined with chemotherapy were developed. Both in vitro and in vivo anticancer efficacies of PDT with prepared nanoparticles were evaluated.
Abstract
Photodynamic therapy (PDT) is a non-invasive and non-surgical method representing an attractive alternative choice for lung cancer treatment. Photosensitizers selectively accumulate in tumor tissue and lead to tumor cell death in the presence of oxygen and the proper wavelength of light.
To increase the therapeutic effect of PDT, we developed both photosensitizer- and anticancer agent-loaded lung cancer-targeted nanoparticles. Both enhanced permeability and retention (EPR) effect-based passive targeting and hyaluronic-acid-CD44 interaction-based active targeting were applied. CD44 is a well-known hyaluronic acid receptor that is often introduced as a biomarker of non-small cell lung cancer.
In addition, a combination of PDT and chemotherapy is adopted in the present study. This combination concept may increase anticancer therapeutic effects and reduce adverse reactions.
We chose hypocrellin B (HB) as a novel photosensitizer in this study. It has been reported that HB causes higher anticancer efficacy of PDT compared to hematoporphyrin derivatives1. Paclitaxel was selected as the anticancer drug since it has proven to be a potential treatment for lung cancer2.
The antitumor efficacies of photosensitizer (HB) solution, photosensitizer encapsulated hyaluronic acid-ceramide nanoparticles (HB-NPs), and both photosensitizer- and anticancer agent (paclitaxel)-encapsulated hyaluronic acid-ceramide nanoparticles (HB-P-NPs) after PDT were compared both in vitro and in vivo. The in vitro phototoxicity in A549 (human lung adenocarcinoma) cells and the in vivo antitumor efficacy in A549 tumor-bearing mice were evaluated.
The HB-P-NP treatment group showed the most effective anticancer effect after PDT. In conclusion, the HB-P-NPs prepared in the present study represent a potential and novel photosensitizer delivery system in treating lung cancer with PDT.
Introduction
Photodynamic therapy (PDT) is composed of three major factors: photosensitizers, light, and oxygen. PDT is reported as a promising treatment for various cancers3. When the photosensitizers are administered into the cancer patient, they selectively accumulate in the tumor tissues. When the proper wavelength of light is applied, the highly reactive singlet oxygen and other free radicals lead to tumor cell damage4.
Lung cancer was introduced as one of the first applications for PDT in the early 1980s5. PDT provides several advantages in treating lung cancer. Since PDT is a non-invasive and non-surgical treatment, it is an attractive alternative choice for the patients in whom surgical resection is inappropriate.
There have been many challenges to enhance the cancer-targeting efficacy of the photosensitizers. Increasing photosensitizer accumulation in cancer sites and decreasing accumulation in normal tissues are the identical goals for the cancer-targeting studies. A variety of targeted drug delivery systems, such as polymers, liposomes, and nanoparticles are adopted as photosensitizer carriers6-8. In our previous studies, nanoparticles effectively increased the cancer-targeting abilities of the photosensitizers9,10. Nanoparticles are ideal cancer-targeting carriers since they possess both passive and active targeting abilities. The leaky tumor vessels provide opportunity for nano-sized carriers to accumulate easily in tumors, which is well-known as the enhanced permeability and retention (EPR) effect11,12. The interaction between the nanoparticles and the specific receptors on cancer cells enables active cancer targeting. In this study, we prepared hyaluronic acid-based nanoparticles to interact with CD44, the major hyaluronic acid receptor that is overexpressed on lung cancer cells13.
To maximize the anticancer efficacy, a combination of PDT and chemotherapy is adopted in the present study. This combination concept may permit an increased therapeutic effect. Furthermore, decreased doses of both the photosensitizer and the anticancer drug can diminish adverse effects. We selected hypocrellin B (HB) as a novel photosensitizer in the present study. HB is isolated from Chinese medicinal fungus Hypocrella bambuase. Shang et al. reported that HB-based PDT possesses a higher anticancer efficacy when compared to hematoporphyrin derivative-based PDT1. Paclitaxel was selected as the anticancer drug since it has proven to be a potential treatment for various cancers, including lung cancer2.
Herein, we compared the anticancer efficacies of photosensitizer (hypocrellin B, HB) solution, photosensitizer-encapsulated hyaluronic acid-ceramide nanoparticles (HB-NPs), and both photosensitizer- and anticancer agent (paclitaxel)-encapsulated hyaluronic acid-ceramide nanoparticles (HB-P-NPs) after PDT. The in vitro phototoxicity in A549 (human lung adenocarcinoma) cells and the in vivo antitumor efficacy in A549 tumor-bearing mice were evaluated.
Protocol
Representative Results
Discussion
El paso más crítico en este estudio es la selección de las condiciones apropiadas láser: longitud de onda, potencia y tiempo de irradiación. La longitud de onda apropiada de luz adecuada para el fotosensibilizador específica es necesaria para la PDT. Se utilizó un láser de 630 nm que era apropiado para hipocrelina B. La potencia de salida era otro factor importante, que se fijó en 400 mW / cm2 sobre la base de muchos estudios piloto. Potencias de salida superior a 400 mW / cm2 dañadas las…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
Este estudio fue apoyado por ninguna concesión. 14-2014-017 del Fondo de Investigación SNUBH.
Los autores están en deuda con J. Patrick Barron, Profesor Emérito de la Universidad Médica de Tokio y Profesor Adjunto, Hospital Bundang Universidad Nacional de Seúl, por su pro bono edición de este manuscrito.
Materials
| oligo hyaluronic acid | Bioland Co., Ltd. | _ | |
| DS-Y30 (ceramide 3B; mainly N-oleoyl-phytosphingosine) | Doosan Biotech Co., Ltd. | _ | |
| adipic acid dihydrazide | Sigma Aldrich | A0638 | |
| N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide | Sigma Aldrich | 39391 | |
| 4-(chloromethyl)benzoyl chloride | Sigma Aldrich | 270784 | |
| Tween 80 | Tokyo Chemical Industry Co., Ltd. | T0546 | |
| syringe filter | Sartorius Stedim Biotech GmbH | 17762 | 15 mm, RC, PP, 0.45 µm |
| triethylamine | Sigma Aldrich | T0886 | |
| Mini-GeBAflex tubes | Gene Bio-Application Ltd. | D070-12-100 | |
| Paclitaxel | Taihua Corporations | _ | |
| RPMI-1640 | Gibco Life Technologies, Inc. | 11875 | |
| Penicillin–streptomycin | Gibco Life Technologies, Inc. | 15070 | |
| Fetal bovine serum | Gibco Life Technologies, Inc. | 16140071 | |
| Celite (Filter agent) | Sigma Aldrich | 6858 | See step 1.4 |
Riferimenti
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