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Introduction: Prostate cancer (PC), due to high prevalence, represents an important health problem, with strong economic impact, considering screening, diagnosis, treatment and mortality from the disease. In high-risk and metastatic cases, 80% of the patients present resistance for the treatment. With the advancement of genome editing techniques using CRISPR-Cas9, possibilities for further studies in several neoplasms were found to better understand and control the mechanisms of cell resistance. CRISPR-Cas9 gene editing is specific and effective, which the correction of gene alterations in these resistant cells. Therefore, the oncogene MMP-9 play an important role in the process of migration and invasion of tumor cells to other tissues, generating metastases. However, these data are controversial. Due to the importance of these molecules in carcinogenesis, further investigation in PC is needed to evaluate the role of MMP-9 in PC, using CRISPR-Cas9 system. Methods: MMP9 and miR-21 guide RNAs (sgRNA) sequences were initially inserted into plasmid PX-330. These plasmids, with MMP-9 inserts, were transfected in PC cell lines DU145 and PC-3M-luc-C6. The gene and protein expression of MMP9 were performed by qRT-PCR and Western Blotting, respectively, and the apoptosis were analyzed by flow cytometry of the sgRNA transfected cells for MMP9 and compared to control group. Results: We performed the digestion and insertion techniques of MMP9 sgRNAs in the PX-330 plasmid, validated by sequencing. The transfected cells with MMP9 sgRNAs 1 and 2 showed positive GFP, that proves the transfection efficiency. Increased initial apoptosis were observed in PC-3M-luc-C6 transfected with MMP9 sgRNA1 and 2,p= 0,002, in compared to control cells. Conclusion: The CRISPR-Cas9 system were effective, confirmed by the sequence results, and transfections by GFP. These cells transfected with sgRNAs 1 and 2 presented a higher apoptosis rate.

Palavras Chave

Prostatic Neoplasms; Matrix Metalloproteinase 9; CRISPR – Cas Systems.


Câncer de Próstata Metastático


Faculdade de Medicina da Universidade de São Paulo - Sao Paulo - Brasil


Juliana Alves Camargo, Nayara Izabel Viana, Ruan Cesar Pimenta, Vanessa Ribeiro Guimarães, Gabriel Arantes, Ericka B Trarbach, Kátia R M Leite, William C Nahas, Miguel Srougi, Sabrina T Reis