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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photobiomodulation combined with photodynamic therapy using ruthenium phthalocyanine complexes in A375 melanoma cells: Effects of nitric oxide generation and ATP production

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Negri, Laisa Bonafim [1] ; Martins, Tassia Joi [2] ; da Silva, Roberto Santana [3, 2, 1] ; Hamblin, Michael R. [3, 4]
Total Authors: 4
[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Fis & Quim, Ave Cafe S-N, Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, Ribeirao Preto, SP - Brazil
[3] Massachusetts Gen Hosp, Wellman Ctr Photomed, Boston, MA 02114 - USA
[4] Harvard Med Sch, Dept Dermatol, Boston, MA 02115 - USA
Total Affiliations: 4
Document type: Journal article
Web of Science Citations: 1

Light irradiation has been used in clinical therapy for several decades. In this context, photobiomodulation (PBM) modulates signaling pathways via ROS, ATP, Ca2+, while photodynamic therapy (PDT) generates reactive oxygen species by excitation of a photosensitizer. NO generation could be an important tool when combined with both kinds of light therapy. By using a metal-based compound, we found that PBM combined with PDT could be a beneficial cancer treatment option. We used two types of ruthenium compounds, ({[}Ru(Pc)], Pc = phthalocyanine) and trans-{[}Ru(NO)(NO2)(Pc)]. The UV-vis spectra of both complexes displayed a band in the 660 nm region. In the case of 0.5 mu M trans-{[}Ru(NO)(NO2)(Pc)], light irradiation at the Q-band reduced the percentage of viable human melanoma (A375) cells to around 50% as compared to {[}Ru(Pc)]. We hypothesized that these results were due to a synergistic effect between singlet oxygen and nitric oxide. Similar experiments performed with PDT (660 nm) combined with PBM (850 nm) induced more photocytotoxicity using both {[}Ru (Pc)] and trans-{[}Ru(NO)(NO2)(Pc)]. This was interpreted as PBM increasing cell metabolism (ATP production) and the consequent higher uptake of the ruthenium phthalocyanine compounds and more efficient apoptosis. The use of metal-based photosensitizers combined with light therapy may represent an advance in the field of photodynamic therapy. (AU)

FAPESP's process: 15/03746-9 - Chemo-phototherapeutic process of phthalocyanine-ruthenium system and cisplatin: chemical and photobiological evaluation in aqueous solution and in drug delivery system
Grantee:Laísa Bonafim Negri
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 16/12707-0 - Cytotoxicity and photo-cytotoxicity of new ruthenium-phthalocyanines compounds as nitric oxide and oxygen singlet producers in cancer cell lines. an innovative purpose for metal based drug
Grantee:Roberto Santana da Silva
Support type: Regular Research Grants