Tetsuro Ikebe

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BACKGROUND Matrix metalloproteinases (MMPs) that degrade the extracellular matrices (ECMs) have been thought to play an important role in both the invasion and metastasis of tumors. However, the detailed role of MMPs and TIMPs (tissue inhibitors of MMP) on the biological behavior of tumor cells has yet to be elucidated in vivo. The aim of the present study(More)
We previously reported that interleukin-1 (IL-1) promoted the survival of murine osteoclast-like cells (OCLs) formed in vitro and activated a transcription factor, NF-kappaB, of OCLs. The present study examined whether the activation of NF-kappaB is directly involved in the survival of OCLs promoted by IL-1. The expression of IL-1 type I receptor mRNA in(More)
We examined whether or not the gelatinolytic activity in tumor tissue was associated with the invasion and metastasis of oral squamous cell carcinoma (OSCC). Tissue homogenates were prepared from 57 biopsy specimens of OSCC. The gelatinolytic activities in the homogenates were measured by gelatin zymography and its densitometric analysis. The Immunoblot(More)
Interleukin-1 (IL-1) is one of the most potent bone-resorbing factors involved in bone loss associated with inflammation. We previously reported that IL-1 prolonged the survival of multinucleated osteoclast-like cells (OCLs) formed in cocultures of murine osteoblasts/stromal cells and bone marrow cells via the prevention of spontaneously occurring(More)
Proliferation and activation of hepatic stellate cells (HSCs) are critical steps for the development of postnecrotic fibrosis in the liver. The present study aimed to reveal the inhibitory effect of the semisynthetic analogue of fumagillin TNP-470 on these events for its possible use as an antifibrogenic agent. Rat models of carbon tetrachloride (CCl(4))-(More)
Reduction or loss of the intercellular junctions known as desmosomes may contribute to the invasive and metastatic behaviour of various carcinomas. Previous studies have shown that metastasis of oral squamous cell carcinomas of the head and neck correlates with a reduction in immunohistochemical staining for desmoplakin and desmoglein at the invasion front.(More)
Several members of the transient receptor potential (TRP)-channel family are expressed in cancer cells. One, cold/menthol-sensitive TRPM8, is reportedly an important player in carcinogenesis in human prostate cancer, although its involvement in oral squamous cell carcinoma (SCC) remains unclear. The present(More)
Multicentric occurrence is an important characteristic of hepatocellular carcinoma. We evaluated clinicopathological criteria for multicentric hepatocellular carcinoma and identified risk factors for such carcinogenesis. Subjects were 251 consecutive patients undergoing liver resection for hepatocellular carcinoma. One kind of multicentric hepatocellular(More)
In order to clarify the mechanism(s) by which cyclic GMP inhibits the generation of inositol phosphates in rat aorta segments and cultured bovine aortic smooth muscle cells, we studied phosphoinositide hydrolysis and GTPase activity in homogenates and membrane preparations of cultured bovine aortic smooth muscle cells. Pretreatment of homogenate(More)
We investigated whether proteasomes were involved in the invasiveness of oral squamous cell carcinoma (SCC) cells. The migration of SCC cells through a gelatin-coated membrane was enhanced with tumor necrosis factor alpha (TNF alpha), which was strongly inhibited by a peptide aldehyde, N-acetyl-Leu-Leu-norleucinal (ALLN), but not by its structurally related(More)