Nikolaos P. Mastroyiannopoulos

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MicroRNAs (miRNAs) are small RNA molecules that post-transcriptionally regulate gene expression and have been shown to play an important role during development. miR-1, miR-133a, miR-133b and miR-206 are expressed in muscle tissue and induced during muscle cell differentiation, a process that directs myoblasts to differentiate into mature myotubes, which(More)
X-linked nephrogenic diabetes insipidus (NDI) is a rare disease characterized by a malfunctioning renal response to the antidiuretic hormone arginine vasopressin (AVP) due to mutations in the AVPR2 gene. A limited number of mutations in the AVPR2 gene resulting in partial phenotype have been described so far. In this mini-review the retrospective analysis(More)
The woodchuck post-transcriptional regulatory element (WPRE) can naturally accumulate hepatitis transcripts in the cytoplasm, and has been recently exploited as an enhancer of transgene expression. The retention of mutant myotonic dystrophy protein kinase (DMPK) transcripts in the nucleus of myotonic dystrophy (DM) cells has an important pathogenic role in(More)
Certain higher vertebrates developed the ability to reverse muscle cell differentiation (dedifferentiation) as an additional mechanism to regenerate muscle. Mammals, on the other hand, show limited ability to reverse muscle cell differentiation. Myogenic Regulatory Factors (MRFs), MyoD, myogenin, Myf5 and Myf6 are basic-helix-loop-helix (bHLH) transcription(More)
The complex process of skeletal muscle differentiation is organized by the myogenic regulatory factors (MRFs), Myf5, MyoD, Myf6, and myogenin, where myogenin plays a critical role in the regulation of the final stage of muscle differentiation. In an effort to investigate the role microRNAs (miRNAs) play in regulating myogenin, a bioinformatics approach was(More)
In myotonic dystrophy type I (DM1), nuclear retention of mutant DMPK transcripts compromises muscle cell differentiation. Although several reports have identified molecular defects in myogenesis, it remains still unclear how exactly the retention of the mutant transcripts induces this defect. We have recently created a novel cellular model in which the(More)
The discovery of catalytic nucleic acids (CNAs) has provided scientists with valuable tools for the identification of new therapies for several untreated diseases through down regulation or modulation of endogenous gene expression involved in these ailments. These CNAs aim either towards the elimination or repair of pathological gene expression. Ribozymes,(More)
TWIST is a transcription factor expressed during early embryonic development. In this study we investigate the expression of TWIST during human muscle development. Human TWIST was found to be endogenously expressed in human fetal myoblasts, and its expression decreased during late stages of development. Myoblasts showed an increasing capacity to(More)
The discovery of catalytic nucleic acids (CNAs) has provided scientists with valuable tools for the identification of new therapies for several untreated diseases through down regulation or modulation of endogenous gene expression involved in these ailments. These CNAs aim either towards the elimination or repair of pathological gene expression. Ribozymes,(More)
Four cationic hydrophilic star homopolymers based on the novel hydrophilic, positively ionizable cross-linker bis(methacryloyloxyethyl)methylamine (BMEMA) were synthesized using sequential group transfer polymerization (GTP) and were, subsequently, evaluated for their ability to deliver siRNA to mouse myoblast cells. The nominal degrees of polymerization(More)