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Metastatic Melanoma: A Preclinical Model Standardization and Development of a Chitosan-Coated Nanoemulsion Containing Temozolomide to Treat Brain Metastasis

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Abstract

Melanoma is the most aggressive type of skin cancer. Brain metastasis is the worst scenario in metastatic melanoma and the treatment options for these patients are limited. Temozolomide (TMZ) is a chemotherapy agent used to treat primary central nervous system tumors. Our objective was to develop chitosan-coated nanoemulsion containing temozolomide (CNE-TMZ) for nasal route administration to melanoma brain metastasis treatment. A preclinical model of metastatic brain melanoma was standardized, and the efficiency of the developed formulation was further determined in vitro and in vivo. The nanoemulsion was done by spontaneous emulsification method and the formulation was characterized by size, pH, polydispersity index, and zeta potential. Culture assessments to determine cell viability were done in the A375 human melanoma cell line. To determine the safety of formulation, healthy C57/BL6 mice were treated with a nanoemulsion without TMZ. The model in vivo used B16-F10 cells implanted by stereotaxic surgery in C57/BL6 mice brains. The results demonstrate that the preclinical model used showed to be useful to analyze the efficiency of new candidate drugs to treat melanoma brain metastasis. The chitosan-coated nanoemulsions with TMZ showed the expected physicochemical characteristics and demonstrated safety and efficacy, reducing around 70% the tumor size compared to control mice, and presenting a tendency in mitotic index reduction, becoming an interesting approach to treat melanoma brain metastasis.

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Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.

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Acknowledgements

This study was supported by the Brazilian agencies: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq—Processo 422298/2016-6; 310846/2014-5), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES- processo 001), Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS—Processo 16/2551-0000265-7; PRONEX—Processo 16/2551-0000473-0); NE Gelsleichter, PO de Souza, GN Debom, GS Lenz, GG Roliano, LR Michels, FNS Fachel, JH Azambuja were recipients of UFCSPA, FAPERGS, CAPES or CNPq fellowships. We would like to ackonowlegde G. Rizzotto for technical support on IHC experiments.

Funding

Universidade Federal de Ciências da Saúde de Porto Alegre,Coordenação de Aperfeiçoamento de Pessoal de Nível Superior,001,001,001,001,Conselho Nacional de Desenvolvimento Científico e Tecnológico,422298/2016-6; 310846/2014-5,422298/2016-6; 310846/2014-5,Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul,16/2551-0000265-7; 16/2551-0000473-0

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by NEG, POS, FCT, GND, GSL, GGR, RCS, FV, FNSF, LRM, JHA, HFT, and EB. The first draft of the manuscript was written by NEG and all authors commented on the previous versions of the manuscript. All authors read and approved the final version of the manuscript.

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Correspondence to Elizandra Braganhol.

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Gelsleichter, N.E., de Souza, P.O., Teixeira, F.C. et al. Metastatic Melanoma: A Preclinical Model Standardization and Development of a Chitosan-Coated Nanoemulsion Containing Temozolomide to Treat Brain Metastasis. Cell Mol Neurobiol 43, 2939–2951 (2023). https://doi.org/10.1007/s10571-023-01338-4

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  • DOI: https://doi.org/10.1007/s10571-023-01338-4

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