Project description:In endometrioid carcinoma (EC), grade 1 (G1) EC is generally associated with a good prognosis. However, in a minority of G1, we often find a more aggressive histological pattern: MELF (microcystic, elongated, and fragmented) pattern. We previously revealed that EC with high expression of S100A4 and serum deprivation-response protein (SDPR) was related to MELF pattern invasion. However, the molecular feature of the invasive front area of MELF pattern has not been investigated. In the current study, we searched for genes preferentially expressed in the invasive front area of EC with MELF pattern by using laser microdissection and RNA sequencing, and revealed that Nicotinamide N-methyltransferase (NNMT) is related to invasiveness of MELF pattern. We confirmed that NNMT expression was high in the invasive front area of MELF pattern in immunohistochemical analysis. Moreover, using endometrioid carcinoma cell lines, we showed that NNMT promotes migration, invasion, colony formation, epithelial-mesenchymal transition (EMT), and chemoresistance. We speculated that depletion of NNMT promotes histone methylation and leads to tumor suppression because NNMT consumes S-adenosyl methionine (SAM), which is an essential methylation cofactor. We showed that NNMT-knockout cells the expression of H3K9me2 was enhanced. We speculate that methylation of H3K9 lead to repress the transcription of various oncogenic genes by performing RNA sequencing using NNMT-knockout cell lines. Our findings showed the possibility that NNMT inhibitors, which are expected to be used for the treatment of metabolic disorders, is effective for the treatment of an aggressive EC. This is the first report of the gene analysis focused on the morphological changes of MELF pattern invasion of EC.
Project description:In endometrioid carcinoma (EC), grade 1 (G1) EC is generally associated with a good prognosis. However, in a minority of G1, we often find a more aggressive histological pattern: MELF (microcystic, elongated, and fragmented) pattern. We previously revealed that EC with high expression of S100A4 and serum deprivation-response protein (SDPR) was related to MELF pattern invasion. However, the molecular feature of the invasive front area of MELF pattern has not been investigated. In the current study, we searched for genes preferentially expressed in the invasive front area of EC with MELF pattern by using laser microdissection and RNA sequencing, and revealed that Nicotinamide N-methyltransferase (NNMT) is related to invasiveness of MELF pattern. We confirmed that NNMT expression was high in the invasive front area of MELF pattern in immunohistochemical analysis. Moreover, using endometrioid carcinoma cell lines, we showed that NNMT promotes migration, invasion, colony formation, epithelial-mesenchymal transition (EMT), and chemoresistance. We speculated that depletion of NNMT promotes histone methylation and leads to tumor suppression because NNMT consumes S-adenosyl methionine (SAM), which is an essential methylation cofactor. We showed that NNMT-knockout cells the expression of H3K9me2 was enhanced. We speculate that methylation of H3K9 lead to repress the transcription of various oncogenic genes by performing RNA sequencing using NNMT-knockout cell lines. Our findings showed the possibility that NNMT inhibitors, which are expected to be used for the treatment of metabolic disorders, is effective for the treatment of an aggressive EC. This is the first report of the gene analysis focused on the morphological changes of MELF pattern invasion of EC.
Project description:Grade 1 (G1) endometrioid carcinoma (EC) is relatively a good prognosis. However, in a minority of cases, G1 shows an aggressive histological pattern known as the microcystic, elongated, and fragmented (MELF) pattern. We previously reported that EC with high expression levels of S100A4 and serum deprivation-response protein (SDPR) was related to MELF pattern invasion. However, the molecular features of the invasive front area of the MELF pattern have not been investigated. In this study, we searched for genes preferentially expressed in the invasive front area of EC with the MELF pattern using laser microdissection and RNA sequencing, and showed that nicotinamide N-methyltransferase (NNMT) is related to MELF pattern invasiveness. Immunohistochemical analyses confirmed high NNMT expression in the invasive front area of the MELF pattern. Moreover, NNMT promoted migration, invasion, colony formation, epithelial-mesenchymal transition (EMT), and chemoresistance using EC cell lines. We speculate that depletion of NNMT promotes histone methylation and leads to tumor suppression because NNMT consumes S-adenosyl methionine (SAM), which is an essential methylation cofactor. NNMT knockout cells showed enhanced expression of H3K9me2. RNA sequencing using NNMT knockout cell lines suggested that methylation of H3K9 leads to repression of the transcription of various oncogenic genes. Our findings demonstrate the possibility that NNMT inhibitors, which are expected to be used for the treatment of metabolic disorders, would be effective for the treatment of aggressive EC. This is the first report of gene analyses focusing on the morphological changes associated with MELF pattern invasion of EC.
Project description:Emerging studies have revealed that N6-methyladenosine modification is involved in the development of various cancers. However, the m6A modification pattern of endometrioid ovarian cancer (EOC) has not been demonstrated. In the present study, high-throughput sequencing combined with methylated RNA immunoprecipitation (MeRIP-seq) and RNA sequencing were used to obtain the transcriptome-wide m6A modifications of endometrioid ovarian cancer for the first time.
Project description:Culture of hematopoietic stem and progenitor cells in the presence of thrombopoietin induces megakaryocytic differentiation. Addition of nicotinamide to thrombopoietin-stimulated cultures results in significant increases in megkaryocytic differentiation including greater polyploidization and enhanced proplatelet formation. This study focuses on understanding the differences in the temporal gene expression pattern during differentiation with and without nicotinamide. Nicotinamide was added on day 5. Keywords: treatment response