RESUMO
BACKGROUND: Translationally controlled tumour protein (TCTP) is an antiapoptotic protein highly conserved through phylogeny. Translationally controlled tumour protein overexpression was detected in several tumour types. Silencing TCTP was shown to induce tumour reversion. There is a reciprocal repression between TCTP and P53. Sertraline interacts with TCTP and decreases its cellular levels. METHODS: We evaluate the role of TCTP in melanoma using sertraline and siRNA. Cell viability, migration, and clonogenicity were assessed in human and murine melanoma cells in vitro. Sertraline was evaluated in a murine melanoma model and was compared with dacarbazine, a major chemotherapeutic agent used in melanoma treatment. RESULTS: Inhibition of TCTP levels decreases melanoma cell viability, migration, clonogenicity, and in vivo tumour growth. Human melanoma cells treated with sertraline show diminished migration properties and capacity to form colonies. Sertraline was effective in inhibiting tumour growth in a murine melanoma model; its effect was stronger when compared with dacarbazine. CONCLUSIONS: Altogether, these results indicate that sertraline could be effective against melanoma and TCTP can be a target for melanoma therapy.
Assuntos
Biomarcadores Tumorais/antagonistas & inibidores , Biomarcadores Tumorais/genética , Melanoma/genética , RNA Mensageiro/metabolismo , Sertralina/farmacologia , Neoplasias Cutâneas/tratamento farmacológico , Animais , Antineoplásicos Alquilantes/uso terapêutico , Biomarcadores Tumorais/metabolismo , Linhagem Celular Tumoral , Movimento Celular/efeitos dos fármacos , Proliferação de Células/genética , Sobrevivência Celular/efeitos dos fármacos , Dacarbazina/uso terapêutico , Feminino , Expressão Gênica/efeitos dos fármacos , Expressão Gênica/genética , Inativação Gênica , Humanos , Melanoma/metabolismo , Melanoma Experimental/tratamento farmacológico , Camundongos , Camundongos Endogâmicos C57BL , RNA Interferente Pequeno/genética , Sertralina/uso terapêutico , Transfecção , Proteína Tumoral 1 Controlada por Tradução , Ensaio Tumoral de Célula-Tronco , Proteína Supressora de Tumor p53/metabolismoRESUMO
This is the first study on the hemolymph from a spider of the Loxosceles genus. These animals are responsible for a great number of envenomation cases worldwide. Several studies on Loxosceles venoms have been published, and the knowledge about the venom and its toxins is considerable, not only regarding the biological and biochemical characterization, but also regarding structural, genetic and phylogenetic approaches. However, the literature on Loxosceles hemolymph is nonexistent. The main goal of the present study was to characterize biochemically the hemolymph content, and especially, to identify its different hemocytes. Moreover, many papers have already shown molecules whose source is the hemolymph and their very interesting activities and biomedical applications, for example, antifungal and antibacterial activities. A 2D-SDS-PAGE of brown spider hemolymph showed approximately 111 spots for pH 3-10 and 150 spots for pH 4-7. A lectin-blotting assay showed that hemolymph carbohydrate residues were similar to those found in venom. Several types of TAG and DAG phospholipids were found in the hemolymph and characterized by HPTLC and mass spectrometry. Four different hemocytes were characterized in Loxosceles intermedia hemolymph: prohemocyte, plasmatocyte, granulocyte and adipohemocyte. This paper opens new possibilities on toxinology, studying an unknown biological material, and it characterizes a source of molecules with putative biotechnological applications.
