Masanobu Morita

Learn More
The transcription factor Klf4 has demonstrated activity in the reprogramming of somatic cells to a pluripotent state, but the molecular mechanism of this process remains unknown. It is, therefore, of great interest to understand the functional role of Klf4 and related genes in ESC regulation. Here, we show that homozygous disruption of Klf5 results in the(More)
ES cells represent a valuable model for investigating early embryo development and hold promise for future regenerative medicine strategies. The self-renewal of pluripotent mouse ES cells has been shown to require extrinsic stimulation by the bone morphogenetic protein (BMP) and leukemia inhibitory factor signaling pathways and the expression of the(More)
The Keap1-Nrf2 system plays a central role in cytoprotection against electrophilic/oxidative stresses. Although Cys151, Cys273, and Cys288 of Keap1 are major sensor cysteine residues for detecting these stresses, it has not been technically feasible to evaluate the functionality of Cys273 or Cys288, since Keap1 mutants that harbor substitutions in these(More)
Embryonic stem cells (ESCs) can be propagated indefinitely in culture, while retaining the ability to differentiate into any cell type in the organism. The molecular and cellular mechanisms underlying ESC pluripotency are, however, poorly understood. We characterize a population of early mesoderm-specified (EM) progenitors that is generated from mouse ESCs(More)
BACKGROUND The heart forms from a linear tube that is subject to complex remodeling during embryonic development. Hallmarks of this remodeling are the looping of the heart tube and the regionalization into chamber and non-chamber myocardium. Cardiomyocytes in the future chamber myocardium acquire different cellular and physiological characteristics through(More)
Left-sided expression of Nodal in the lateral plate mesoderm is a conserved feature necessary for the establishment of normal left-right asymmetry during vertebrate embryogenesis. By using gain- and loss-of-function experiments in zebrafish and mouse, we show that the activity of the Notch pathway is necessary and sufficient for Nodal expression around the(More)
An HLF (HIF-1alpha-like factor)/HIF-2alpha-knockout mouse is embryonic lethal, preventing investigation of HLF function in adult mice. To investigate the role of HLF in adult pathological angiogenesis, we generated HLF-knockdown (HLF(kd/kd)) mice by inserting a neomycin gene sandwiched between two loxP sequences into exon 1 of the HLF gene. HLF(kd/kd) mice(More)
Basic transcription element binding protein (BTEB) is a transcription factor with a characteristic zinc finger motif and is most remarkably enhanced by thyroid hormone T(3) treatment (R. J. Denver et al., J. Biol. Chem. 272:8179-8188, 1997). To investigate the function of BTEB per se and to touch on the effects of T(3) (3,5,3'-triiodothyronine) on mouse(More)
AhR repressor (AhRR) is an AhR-related bHLH-PAS transcription factor. It is known to repress AhR transcription activity in a competitive manner. To examine AhRR functions in mice, we produced AhRR-deficient mice by gene knockout. AhRR(-/-) mice were born in normal Mendelian proportions, grew well, and were fertile. AhR(-/-) mice exhibited higher levels of(More)
Reactive persulfide species such as glutathione persulfide (GSSH) are highly abundant biomolecules. Persulfide dioxygenase (also called ethylmalonic encephalopathy protein 1, ETHE1) reportedly metabolizes GSSH to GSH with simultaneous oxygen consumption. How ETHE1 activity is regulated is still unclear, however. In this study, we describe the possible role(More)