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Biomedical subjects

T Tsurumachi

Publications and source records attributed to T Tsurumachi.

17 recordsLinked to original sources
PubMed2004

Endodontic treatment of an invaginated maxillary lateral incisor with a periradicular lesion and a healthy pulp.

AIM: To report the healing of a periradicular lesion following nonsurgical root canal treatment of a dental invagination. SUMMARY: A case of dens invaginatus type 3 with a periradicular lesion and a healthy pulp is reported. Nonsurgical root canal treatment of the invagination was performed successfully and resolved an associated periradicular lesion. Despite the complex anatomy and a diagnosis of apical periodontitis, pulp health was retained after endodontic treatment of the invaginated canal. Clinical considerations and treatment are discussed and reported. KEY LEARNING POINTS: Dens invaginatus can present in a variety of forms, knowledge of which can usefully inform endodontic diagnosis and treatment. In certain cases, success can be achieved by treating the invagination alone. Pulp health may be preserved during and after treatment of an infected invagination.

Child↗
PubMed2003

Endodontic and orthodontic treatment of a cross-bite fused maxillary lateral incisor.

AIM: To describe combined endodontic and orthodontic treatment of a maxillary lateral incisor fused with a supernumerary. SUMMARY: A rare case is presented in which combined endodontic and orthodontic treatment was performed on a cross-bite fused tooth. Clinical and radiographic examination showed the maxillary lateral incisor fused with a supernumerary and an impacted canine. The fused tooth required nonsurgical and surgical endodontic treatment for functional and aesthetic reasons. The root canals were dressed with calcium hydroxide for 2 months before they were obturated with thermoplasticized injectable gutta-percha. Then, the distal part of the fused tooth was removed and the mesial part of the tooth was replanted and fixed. Three months after the completion of orthodontic therapy, the impacted canine erupted between the remaining tooth and the first premolar. Recall examination, 3 years after completion of root canal treatment, showed clinical and radiographic evidence of healing. KEY LEARNING POINTS: Fusion has been described as a development anomaly characterized by the union of two adjacent teeth. Proper combined endodontic and orthodontic treatment resulted in maintaining one tooth half and solving the aesthetic and functional problem of a fused tooth.

Child↗
PubMed2002

Non-surgical root canal treatment of dens invaginatus type 2 in a maxillary lateral incisor.

AIM: To describe the clinical management of an unusual dens invaginatus type 2. SUMMARY: A case of dens invaginatus in a maxillary lateral incisor with a periapical lesion is reported. The patient presented with pain and localized swelling. Despite the complex anatomy and diagnosis of dens invaginatus, non-surgical root canal treatment was performed successfully. Key learning points Dens invaginatus may be presented in many forms, and the aetiology of this phenomenon is not fully understood. Due to abnormal anatomical configuration, dens invaginatus presents technical difficulties in its clinical management. Non-surgical root canal treatment can be performed successfully.

Calcium Hydroxide↗
PubMed2002

Non-surgical root canal treatment of dens invaginatus type 2 in a maxillary lateral incisor.

AIM: To describe the clinical management of an unusual dens invaginatus type 2. SUMMARY: A case of dens invaginatus in a maxillary lateral incisor with a periapical lesion is reported. The patient presented with pain and localized swelling. Despite the complex anatomy and diagnosis of dens invaginatus, non-surgical root canal treatment was performed successfully. KEY LEARNING POINTS: * Dens invaginatus may be presented in many forms, and the aetiology of this phenomenon is not fully understood. * Due to abnormal anatomical configuration, dens invaginatus presents technical difficulties in its clinical management. * Non-surgical root canal treatment can be performed successfully.

Calcium Hydroxide↗
PubMed1999

Inducible nitric oxide synthase activity by interferon-gamma-producing cells in human radicular cysts.

AIM: In this study, the interaction of interferon-gamma-(IFN-gamma) and inducible nitric oxide synthase (iNOS)-producing cells in human radicular cysts were investigated. METHODOLOGY: Inflamed periapical tissues were obtained from patients at the time of endodontic surgical treatments and were cut into two pieces. After fixing with acetone or 4% paraformaldehyde in phosphate-buffered saline, 5-m-thick paraffin and cryostat sections were prepared. The paraffin sections of the inflamed tissues were evaluated histologically with haematoxylineosin stains. The specimens diagnosed as radicular cysts were then examined by immunostaining. Immunohistochemistry for iNOS and fluoresence microscopy for IFN-gamma using the cryostat sections were performed with a mixture of affinity purified human iNOS antiserum and human IFN-gamma monoclonal antibodies. RESULTS: The results revealed that iNOS-gamma producing cells localized adjacent to IFN-gamma-producing cells. In addition, some of iNOS-producing cells exhibited immunoreactive IFN-gamma. On the other hand, epithelial cells showed significant levels of iNOS production, but not IFN-gamma. CONCLUSIONS: The data would suggest the possibility that iNOS production could be precisely controlled by autocrine or paracrine effects of IFN-gamma producing cells in radicular cysts and might play a pivotal role in periapical lesions. These findings are consistent with a hypothesis suggesting that NO inhibitors could be used through the root canals as a pharmacological treatment for periapical lesions.

Adult↗
PubMed1998

Reduced tumorigenicity of human gastric carcinoma cells engineered to produce IL-2 in SCID mice reconstituted with peripheral blood cells from cancer patients.

We have examined the validity of a humanized immune system with an animal model to assess cytokine gene therapy for cancer patients. For that purpose, we prepared hematologically-reconstituted severe combined immunodeficiency mice by transferring patient's peripheral blood cells containing CD34+ cells. These animals were inoculated subcutaneously with human gastric cancer lines transduced with cytokine genes. Tumorigenicity of interleukin-2-producing cells was significantly reduced in reconstituted but not in non-reconstituted mice, whereas that of wild-type and interleukin-6 producer cells was not affected irrespective of the reconstitution status. An inability to induce protective immunity in the reconstituted mice, which had rejected interleukin-2-producers, suggested that the effector cells mediating the antitumor response were non-T cells of donor origin. The experimental system presented in this study seems to be a feasible model to investigate applicable cytokines for patients.

Adult↗
PubMed1998

Production of human-inducible nitric oxide synthase in radicular cysts.

To examine if nitric oxide (NO) is produced in radicular cysts, NO synthase (NOS) production was analyzed. Periapical tissues were removed from patients at the time of endodontic surgery. Frozen tissue sections were histologically evaluated with hematoxylin-eosin staining. Production of human-inducible NOS (iNOS) in apical cysts was then immunohistochemically examined. Immunoreactive human iNOS was widely distributed in epithelial cells, endothelial cells, fibroblasts, macrophages, or polymorphonuclear leukocytes. Remarkably, iNOS-positive cells were significantly present around blood vessels, and cells residing apart from the blood vessels showed weak or no iNOS production, suggesting that only cells around blood vessels could be stimulated for iNOS synthesis. These data demonstrated the possibility that several, but not all, cells could be stimulated to synthesize iNOS in inflamed tissues. In the presence of iNOS, NO can be produced spontaneously in periapical lesions and may play a crucial role in the regulation of chronic infection.

Enzyme Induction↗
PubMed1998

Cytokine regulation on the synthesis of nitric oxide in vivo by chronically infected human polymorphonuclear leucocytes.

To determine if nitric oxide (NO) is produced by chronically infected human polymorphonuclear leucocytes (PMNs) in vivo, inflamed exudates (periapical exudates: PE) collected from periapical periodontitis patients were examined. Cell-free supernatants and cells were separated by centrifugation. Significant levels of nitrite concentrations were observed in the supernatants. The production of inducible NO synthase (iNOS) in highly purified PMNs derived from PEs was then immunocytochemically determined using rabbit anti-human iNOS antiserum. In vitro, human peripheral blood PMNs (PB-PMNs) isolated from patients were cultured with a combination of Esherichia coli-lipopolysaccharide (LPS), recombinant human interferon-gamma (rhIFN-gamma) and/or interleukin-1 beta (rhIL-1 beta). The stimulated PB-PMNs showed steady-state levels of nitrite. The stimulation of LPS, rhIFN-gamma and rhIL-1 beta showed more NO induction than that of LPS with either IFN-gamma or IL-1 beta, suggesting the synergistic effects of cytokines. Cryostat sections of surgically removed periapical tissues were also immunohistochemically examined for iNOS, IFN-gamma and IL-1 beta. Two-colour immunohistochemistry revealed the interaction of iNOS-producing PMNs and IFN-gamma- or IL-1 beta-producing mononuclear cells. On the basis of these data, we concluded that with the stimulation of inflammatory cytokines derived from mononuclear cells, PMNs can spontaneously produce NO at the site of chronic infection. The present studies are consistent with a hypothesis suggesting that PMNs could be regulated and delicately balanced to produce NO by mononuclear cell-derived cytokines in vivo. NO-producing cells may play a pivotal role in chronic inflammation.

Adult↗
PubMed1997

Resection of liver metastasis from alpha-fetoprotein-producing early gastric cancer: report of a case.

We herein present a case of resected synchronous solitary liver metastasis from alpha-fetoprotein (AFP)-producing early gastric cancer. A 61-year-old woman, who was diagnosed at a routine medical checkup as having early gastric cancer with a liver tumor, came to our hospital for surgery. Her serum AFP level was high at 910 ng/ml. An examination was performed to determine whether the liver tumor was primary hepatocellular carcinoma or metastasis from early gastric cancer. She had no evidence of either a hepatitis B or C virus infection, and her liver function was normal. A biopsy specimen from the gastric cancer predominantly revealed moderately differentiated adenocarcinoma, but a focally trabecular pattern compatible with AFP-producing gastric cancer was also observed. Preoperatively, it was concluded that the liver tumor was metastasis from an AFP-producing early gastric cancer. We thus performed distal gastrectomy and a posterior segmentectomy of the liver. Her serum AFP level decreased to the normal range within 2 weeks after the operation. An immunohistological examination revealed that AFP-positive cells were present in both the gastric cancer and liver tumor. One year after the operation, there was no sign of recurrence.

Adenocarcinoma↗
PubMed1997

The polymeric immunoglobulin receptor (secretory component) in a human intestinal epithelial cell line is up-regulated by interleukin-1.

Secretory component (SC or polymeric immunoglobulin receptor) on mucosal epithelial cells mediates transcytosis of polymeric immunoglobulin into external fluids and functions as a receptor for polymeric immunoglobulin. SC expression in a human colonic adenocarcinoma cell line, HT-29 has been reported to be up-regulated by various cytokines, such as interferon-gamma, tumour necrosis factor-alpha and interleukin-4 (IL-4). However, up-regulation of SC by IL-1 is controversial. In this study, we investigated the effect of human recombinant IL-1 alone on SC expression in HT-29 cells in detail. Immunocytochemistry and Northern blot analysis revealed that IL-1 beta increased both the number of SC-positive cells and SC mRNA expression. Enzyme-linked immunosorbent assay revealed that IL-1 beta enhanced secretion by HT-29 cells in both time- and dose-dependent manners. IL-1 alpha had the same effects on HT-29 cells. Northern blot analysis demonstrated that cycloheximide and actinomycin D abolished the effect of IL-1. Moreover, we detected IL-1 receptor (IL-1R) type I mRNA in HT-29 cells by polymerase chain reaction (PCR) and sequenced the PCR-amplified product. We think that it reflects the possibility of the presence of IL-1R in HT-29 cells. From these data, we concluded that IL-1 beta and IL-1 alpha play regulatory roles in SC expression, and their effects depend on de novo protein synthesis and transcription.

Blotting, Northern↗
PubMed1996

Expression of inflammatory cytokine genes in vivo by human alveolar bone-derived polymorphonuclear leukocytes isolated from chronically inflamed sites of bone resorption.

Alveolar bone-derived polymorphonuclear leukocytes (PMNs) were characterized for their ability to produce inflammatory cytokines such as interleukin-1 alpha (IL-1 alpha), IL-1 beta, tumor necrosis factor alpha (TNF alpha), and IL-6 in vivo. Periapical exudates (PE) were collected from periapical lesions with chronic periapical periodontitis through root canals. Cells and noncellular supernatants were then isolated by centrifugation. The concentration of cytokines present in the noncellular supernatants were determined by ELISA. High concentrations of IL-1 alpha, IL-1 beta, and IL-6 were detected in PE, however, TNF alpha was not. PE contains predominantly PMNs ( > 95% of residing cells) with a few percent of lymphocytes and/or macrophages. These alveolar bone-derived PMNs were purified by the Ficoll-Hypaque gradient method and were analyzed for cytokine mRNA expression using the cytokine-specific reverse-transcription polymerase chain reaction. Highly purified PMNs ( > 99.5%) isolated from PE expressed significant levels of mRNA for IL-alpha, IL-1 beta, and TNF alpha. IL-6 mRNA was not detected, although a high concentration of IL-6 was detected in supernatants of PE by ELISA. The IL-6 secretion in PE could be derived from macrophages, T lymphocytes, osteoblasts, or fibroblasts around periapical lesions. These data strongly suggest that human PMNs derived from alveolar bone can spontaneously produce IL-1 alpha, IL-1 beta, and TNF alpha at sites of inflammation, and probably initiate inflammation and regulate augmentation of bone resorption in vivo.

Adolescent↗
PubMed1996

[A case of hepatocellular carcinoma with reduction of primary tumor and disappearance of multiple lung metastasis].

A 62-year-old male patient was admitted for spontaneous rupture of hepatocellular carcinoma. He also had multiple lung metastases and liver dysfunction. So neither operation nor trans-arterial embolization could be performed. He had been administered UFT (400 mg/day) orally every day. After 5 months of daily administration, there was complete disappearance of multiple lung metastasis and reduction of the primary tumor. This case suggests that UFT is effective for some advanced hepatocellular carcinoma with extrahepatic metastasis.

Administration, Oral↗
PubMed1996

[Assessment of proliferative cell nuclear antigen expression and clinical prognosis in gastric malignant lymphoma].

Clinicopathological study was performed in 15 resected cases of gastric malignant lymphoma. The clinicopathological features were as follows. 1) In 6 of 15 cases, the tumor was located in the upper part of the stomach. 2) Lymph node metastasis was observed in 5 of 12 cases. 3) In 3 of 15 cases, multiple tumorous lesions were noted. We also studied the relationship between PCNA expression and clinical prognosis in 10 cases, specimens of which were well preserved, out of 15 cases. About 500 nuclei immunohistochemically stained by PCNA monoclonal antibody were counted, and results were expressed by positive cell ratio (PCNA labelling index LI%). In conclusion, 1) the positive cases of lymph node metastasis showed a tendency for PCNA LI to increase compared with the negative cases. 2) The recurrent cases showed a tendency for increased PCNA LI compared with the cases without recurrence. 3) Cases with more than 60% of PCNA LI tended to have a poor prognosis compared with those of less than 60%.

Adult↗
PubMed1995

Treatment of large periapical lesions by inserting a drainage tube into the root canal.

Long-term drainage and depressurization is performed by inserting a stainless steel tube into the root canal of teeth with persisting periapical exudation. This article presents 2 cases of large periapical lesions showing a complete healing of bone after the drainage tube procedure. The tube allows lasting drainage, relieves the pressure and modifies the local apical environment so the host defense mechanism can exert repair process.

Adolescent↗
PubMed1994

Human polymorphonuclear leukocytes derived from chronically inflamed tissue express inflammatory cytokines in vivo.

In this study, we sought to determine if human polymorphonuclear leukocytes (PMNs) derived from chronically inflamed tissues can produce inflammatory cytokines in vivo. Human gingival crevicular fluid (GCF) with adult periodontitis was collected, and PMNs in GCF were examined after purified by Ficoll-Hypaque gradient method. Cytokines from peripheral blood (PB) cells stimulated with concanavalin A, LPS, or zymosan were also characterized, since GCF contains predominantly PMNs (> 95%) with a small number of lymphocytes or macrophages. Production of interleukin-1 alpha (IL-1 alpha), IL-1 beta, tumor necrosis factor-alpha (TNF alpha), and IL-6 in GCF or culture supernatants of peripheral blood cells was determined by ELISA. Significant levels of IL-1 alpha and IL-1 beta secretion were found in GCF. PB cells in culture showed prominent cytokine production from monocytes/macrophages, followed by lymphocytes. Human peripheral blood PMNs (PB-PMNs) also produced low levels of IL-1 alpha and IL-1 beta, but not TNF alpha and IL-6. These cells were also examined for cytokine mRNA expression using the reverse transcription-polymerase chain reaction analysis. Highly purified PMNs (> 99.5%) from GCF expressed mRNA for IL-1 alpha, IL-1 beta and TNF alpha, but not for IL-6. PB-PMNs in culture also showed mRNA expression for IL-1 alpha, IL-1 beta, and TNF alpha in a time- and dose-dependent manner, especially after stimulation with zymosan. Therefore, we concluded that human PMNs from inflamed tissues can produce IL-1 alpha, IL-1 beta, and TNF alpha in vivo, but not IL-6.

Adult↗
PubMed1985

Purification and partial sequence of human osteoclast-activating factor: identity with interleukin 1 beta.

The lymphokine osteoclast-activating factor (OAF) was purified to homogeneity. OAF was produced by human peripheral blood mononuclear cells stimulated with concanavalin A and phorbol myristate acetate under serum-free culture conditions. OAF was purified by sequential gel filtration, ion-exchange, and reverse-phase HPLC by following bone resorptive activity. Homogeneity was indicated by the criteria of a single 17,800-dalton band on silver-stained polyacrylamide gels, a single pI 6.8 band on isoelectric focusing, and a single aminoterminal sequence. Purified OAF stimulated half-maximal release of calcium from fetal rat long bones at a concentration of approximately 0.66 ng/ml. The amino-terminal sequence of OAF was determined and found to be identical to that of interleukin 1 beta. Homogeneous OAF possessed an activity of 8.2 X 10(6) U/mg in the thymocyte proliferation assay. Because the m.w., isoelectric point, amino-terminal sequence, and specific activity in the thymocyte proliferation assay are the same for homogeneous OAF and interleukin 1 beta, we conclude that they are the same molecule, and that interleukin 1 beta is the major protein with OAF activity produced by lectin-stimulated peripheral blood mononuclear cells.

Amino Acid Sequence↗