Streptomyces cell death, which occurs as the bacteria develop fruiting bodies and form spores, has been dismissed as nonspecific autolysis caused by cell wall degradation. Now Miguélez et al. (page 515) show that the cell death is complex: it occurs at two different times in two different locations and as a series of defined steps that leave the cell wall intact. Streptomyces grow first along a...

Long noncoding RNAs (lncRNAs) interact with protein factors to regulate different layers of gene expression transcriptionally or posttranscriptionally. Here we report on the functional consequences of the unanticipated interaction of the RNA binding protein K homology-type splicing regulatory protein (KSRP) with the H19 lncRNA (H19). KSRP directly binds to H19 in the cytoplasm of undifferentiat...

Myogenic microRNAs are important regulators of muscle development and differentiation. To better understand the roles of chromatin-modifying and remodeling enzymes in the activation of myogenic microRNA expression, we have functionally analyzed two different protein arginine methyltransferases, Prmt5 and Prmt4, both of which have previously been implicated in the regulation of myogenic mRNA exp...

PURPOSE: The development of cancer cachexia is the most common manifestation of advanced malignant disease. METHOD: The effects on muscle regeneration of β2-adrenoceptor agonist formoterol (0.3 mg/kg) were tested in cachectic tumour-bearing rats (Yoshida AH-130 ascites hepatoma). RESULTS: Administration of formoterol results in a significant increase in the mass and protein content of tibialis ...

Many transcription factors and signaling molecules involved in the guidance of myogenic differentiation have been investigated in previous studies. However, the precise molecular mechanisms of myogenic differentiation remain largely unknown. In the present study, by performing a meta-analysis of C2C12 myogenic differentiation microarray data, we found that leucine-rich repeat-containing 75B (Lr...

Two skeletal muscle-specific regulatory factors, myogenin and MyoD1, share extensive homology within a myc similarity region and have each been shown to activate the morphologic and molecular events associated with myogenesis after transfection into nonmyogenic cells. The BC3H1 muscle cell line expresses myogenin and other muscle-specific genes, but does not express MyoD1 during differentiation...

Cell differentiation is the foundation for tissue development and regeneration, disease modeling, and cell-based therapies. Although the differentiation of cell populations has been extensively studied in many systems, much less is known about the distribution of decision making of single cells within these populations. To characterize the differentiation of single skeletal muscle cells, we use...

In this report, we identify myogenin as an important transcriptional target under the control of three intracellular signaling pathways, namely, the p38 mitogen-activated protein kinase- (MAPK), calcium-calmodulin-dependent protein kinase- (CaMK), and calcineurin-mediated pathways, during skeletal muscle differentiation. Three cis-elements (i.e., the E box, myocyte enhancer factor [MEF] 2, and ...

Previously, three structurally related proteins, MyoD, myogenin, and Myf5, have been identified, and each of them was found to convert C3HlOT1/2 fibroblasts to myoblasts when their respective cDNAs were expressed under the control of a viral promoter. Here, we describe the cloning and DNA sequencing of myogenin cDNAs from chicken and mouse. They encode polypeptides highly homologous to each oth...