Masahide Tojo

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Ubiquitin ligases define the substrate specificity of protein ubiquitination and subsequent proteosomal degradation. The catalytic sequence was first characterized in the C terminus of E6-associated protein (E6AP) and referred to as the HECT (homologous to E6AP C terminus) domain. The human homologue of the regulator of cell proliferation hyperplastic discs(More)
The aryl hydrocarbon receptor nuclear transporter (ARNT) is a member of the basic helix-loop-helix/PAS (Per-ARNT-Sim) family of transcription factors, which are important for cell regulation in response to environmental conditions. ARNT is an indispensable partner of the aryl hydrocarbon receptor (AHR) or hypoxia-inducible factor-1alpha. This protein is(More)
A 60-year-old male with elevated serum AFP levels is reported. Other tumor markers apart from AFP were normal. Serum AFP did not bind to Con A or Lentil-lectin by affinity chromatography. Abdominal ultrasonography, computed tomography and endoscopic retrograded cholangiopancreatography demonstrated a tumor extending from the body to the tail of the(More)
Serum stimulation leads to activation of the serum response factor (SRF)-mediated transcription of immediate-early genes such as c-fos via various signal transduction pathways. We have previously reported that promyelocytic leukemia protein (PML) is involved in the transcriptional regulation by SRF. PML is one of the well-known substrates for modification(More)
BACKGROUND Serum stimulation leads to the activation of various signal transduction pathways in cells, and the resultant signals are integrated into the serum response factor (SRF)-dependent transcription of immediate-early genes such as c-fos. RESULTS To further characterize this response, we investigated the mechanism which controls serum response(More)
Nevus sebaceous is a congenital malformation of the skin within which a number of neoplasms showing adnexal differentiation may arise. Recently, deletions in the patched gene region were reported in nevus sebaceous and constitutive activation of the patched-hedgehog signaling pathway was implicated in the development of tumors arising within nevus(More)
A case of cytomegalovirus (CMV) mononucleosis associated with gastric ulcers is reported in a normal non-immunocompromised host. The demonstration of intranuclear inclusion bodies in a few gastric glandular epithelial cells contributed to the diagnosis of CMV gastritis. Extraction of DNA from the gastric biopsy specimens and the amplification of CMV-DNA by(More)
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