Search results for "MBP"
showing 10 items of 17 documents
Expression of Alpha-Enolase (ENO1), Myc Promoter-Binding Protein-1 (MBP-1) and Matrix Metalloproteinases (MMP-2 and MMP-9) Reflect the Nature and Agg…
2019
Breast cancer is a complex and heterogeneous disease: Several molecular alterations cause cell proliferation and the acquisition of an invasive phenotype. Extracellular matrix (ECM) is considered essential for sustaining tumor growth and matrix metalloproteinases (MMPs) have been identified as drivers of many aspects of the tumor phenotype. Mounting evidence indicates that both &alpha
Transmembrane signaling and cytoplasmic signal conversion by dimeric transmembrane helix 2 and a linker domain of the DcuS sensor kinase
2020
Transmembrane (TM) signaling is a key process of membrane-bound sensor kinases. The C4-dicarboxylate (fumarate) responsive sensor kinase DcuS of Escherichia coli is anchored by TM helices TM1 and TM2 in the membrane. Signal transmission across the membrane relies on the piston-type movement of the periplasmic part of TM2. To define the role of TM2 in TM signaling, we use oxidative Cys cross-linking to demonstrate that TM2 extends over the full distance of the membrane and forms a stable TM homodimer in both the inactive and fumarate-activated state of DcuS. An S186xxxGxxxG194 motif is required for the stability and function of the TM2 homodimer. The TM2 helix further extends on the periplas…
Negative transcriptional control of ERBB2 gene by MBP-1 and HDAC1: diagnostic implications in breast cancer
2013
Abstract Background The human ERBB2 gene is frequently amplified in breast tumors, and its high expression is associated with poor prognosis. We previously reported a significant inverse correlation between Myc promoter-binding protein-1 (MBP-1) and ERBB2 expression in primary breast invasive ductal carcinoma (IDC). MBP-1 is a transcriptional repressor of the c-MYC gene that acts by binding to the P2 promoter; only one other direct target of MBP-1, the COX2 gene, has been identified so far. Methods To gain new insights into the functional relationship linking MBP-1 and ERBB2 in breast cancer, we have investigated the effects of MBP-1 expression on endogenous ERBB2 transcript and protein lev…
Cellular stress positively regulates the expression of Myc promoter-Binding Protein-1 (MBP-1).
2012
Myc Promoter-Binding Protein-1 (MBP-1) Is a Novel Potential Prognostic Marker in Invasive Ductal Breast Carcinoma
2010
BackgroundAlpha-enolase is a glycolytic enzyme that catalyses the formation of phosphoenolpyruvate in the cell cytoplasm. α-Enolase and the predominantly nuclear Myc promoter-binding protein-1 (MBP-1) originate from a single gene through the alternative use of translational starting sites. MBP-1 binds to the P2 c-myc promoter and competes with TATA-box binding protein (TBP) to suppress gene transcription. Although several studies have shown an antiproliferative effect of MBP-1 overexpression on several human cancer cells, to date detailed observations of α-enolase and MBP-1 relative expression in primary tumors versus normal tissues and their correlation with clinicopathological features ha…
The miRNA profile associated with MBP-1 expression in breast cancer SKBR3 cells
2014
Role of Enolase/MBP-1 in non-tumorigenic and cancer cells
The glycolytic enzyme α-enolase is a highly conserved protein involved in multiple functions (Díaz-Ramos A et al 2012). Besides the mainly cytoplasmic localization, the protein has been detected on the surface of prokaryotic and eukaryotic cells where it functions as a plasminogen receptor, while a shorter variant, called Myc promoter-binding protein-1 (MBP-1), is mainly located in the nucleus. Several lines of evidence indicate that MBP-1 acts as a tumor suppressor, negatively regulating cell proliferation or promoting apoptosis of cancer cells. Although a few reports indicate that stressful conditions, such as glucose deprivation or hypoxia, may modulate MBP-1 expression in mammalian cell…
MBP-1 represses N-MYC expression and acts as a tumor suppressor in human Neuroblastoma LAN-5 cells
2013
Neuroblastoma is the most common extra-cranial solid tumor of childhood, originated from cells of the neural crest. Amplification of N-MYC gene and 1p-deletion are found in more than 30% of patients with advanced stages and they are associated with poor prognosis. An alternative translated product of the ENO1 gene, known as MBP-1 (c-myc promoter binding protein-1), acts as a negative regulator of the c-MYC oncogene, ERBB2 and COX-2 genes, furthermore, ENO1/MBP-1 overexpression in Neuroblastoma cells significantly reduces cell growth and induces apoptosis. Even though there are similarities between the c-MYC and N-MYC oncogenes, there are no evidences that MBP-1 is able to interact with N-MY…
MBP-1 reprime l’espressione di N-MYC e svolge il ruolo di oncosoppressore in cellule di Neuroblastoma umano LAN5
2013
Il Neuroblastoma, derivato da cellule neurali simpatiche primitive, è il tumore solido extracranico più comune dell'infanzia. L'amplificazione del gene N-MYC insieme a delezioni nel cromosoma 1p36, sono i marcatori molecolari più frequenti nel Neuroblastoma e sono associati a cattiva prognosi. MBP-1, prodotto alternativo della traduzione dell'mRNA del gene ENO1, è un repressore trascrizionale e agisce direttamente sul promotore dei geni c-MYC, ERBB2 e COX2 (1-3). In cellule di Neuroblastoma è stato osservato che l'espressione ectopica di ENO1/MBP-1 causa induzione di apoptosi e morte cellulare (4). Sebbene esistano similarità di struttura e funzionali tra i geni N-MYC e c-MYC non è noto se …