RESUMO
The striatin family of proteins, comprising STRN, STRN3 and STRN4, are multidomain-containing proteins that associate with additional proteins to form a large protein complex. We previously reported that STRN4 directly associated with protein kinases, such as MINK1, TNIK and MAP4K4, which are associated with tumor suppression or tumor progression. However, it remains unclear whether STRN4 is associated with tumor progression. In this report, we examined the role that STRN4 plays in cancer malignancy. We show that depletion of STRN4 suppresses proliferation, migration, invasion and the anchorage-independent growth of cancer cells. In addition, STRN4 knockdown increases the sensitivity of pancreatic cancer cells to gemcitabine. Finally, we show that STRN4 knockdown suppresses the proliferation and metastasis of cancer cells in mice. Our results demonstrate a possible role of STRN4 in tumor progression.
Assuntos
Proteínas de Ligação a Calmodulina/genética , Proteínas de Ligação a Calmodulina/metabolismo , Metástase Neoplásica/patologia , Neoplasias Experimentais/patologia , Proteínas do Tecido Nervoso/metabolismo , Neoplasias Pancreáticas/patologia , Animais , Anoikis , Linhagem Celular Tumoral , Movimento Celular , Proliferação de Células , Desoxicitidina/análogos & derivados , Desoxicitidina/farmacologia , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Técnicas de Silenciamento de Genes , Células HCT116 , Humanos , Camundongos , Camundongos Nus , Invasividade Neoplásica/genética , Metástase Neoplásica/genética , Neoplasias Experimentais/genética , Proteínas do Tecido Nervoso/genética , Neoplasias Pancreáticas/genética , RNA Interferente Pequeno/metabolismo , GencitabinaRESUMO
Gastrointestinal stromal tumors (GISTs) are mesenchymal tumors of the gastrointestinal tract. It is well known that activating mutations in the receptor tyrosine kinases KIT and platelet-derived growth factor receptor-α have essential roles in the pathogenesis of GISTs. The activation of these receptor protein kinases triggers multiple signaling pathways that promote cell proliferation and survival; however, the exact mechanism by which the activation of these kinases promotes the progression of GISTs remains uncertain. The aim of the present was to search for genes that are associated with the progression of GIST. The present study used reverse transcription-quantitative polymerase chain reaction to demonstrate that adenosine monophosphate deaminase 3 (AMPD3) was highly expressed in GISTs. Furthermore, transfection of GIST-T1 cells with KIT-specific small interfering RNA (siRNA) demonstrated that the expression of AMPD3 was dependent on KIT expression, while the depletion of AMPD3 in human GIST-T1 cells using AMPD3-specific siRNA resulted in the suppression of cell migration and invasion. In addition, AMPD3 depletion sensitized GIST-T1 cells to the tyrosine kinase inhibitor imatinib. The results of the present suggested that the combined inhibition of tyrosine kinases and AMPD3 may be effective for the treatment of GISTs.