51
|
Akagi T, Fukagawa T, Kage Y, To H, Matsunaga N, Koyanagi S, Uchida A, Fujii A, Iba H, Ikemura T, Aramaki H, Higuchi S, Ohdo S. Role of Glucocorticoid Receptor in the Regulation of Cellular Sensitivity to Irinotecan Hydrochloride. J Pharmacol Sci 2009; 109:265-74. [DOI: 10.1254/jphs.08219fp] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
|
52
|
Matsumine A, Kusuzaki K, Nakamura T, Nakazora S, Niimi R, Matsubara T, Uchida K, Murata T, Kudawara I, Ueda T, Naka N, Araki N, Maeda M, Uchida A. Differentiation between neurofibromas and malignant peripheral nerve sheath tumors in neurofibromatosis 1 evaluated by MRI. J Cancer Res Clin Oncol 2008; 135:891-900. [DOI: 10.1007/s00432-008-0523-y] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2008] [Accepted: 11/19/2008] [Indexed: 11/30/2022]
|
53
|
Hayashida-Soiza G, Uchida A, Mori N, Kuwahara Y, Ishida Y. Purification and characterization of antibacterial substances produced by a marine bacteriumPseudoalteromonas haloplanktisstrain. J Appl Microbiol 2008; 105:1672-7. [DOI: 10.1111/j.1365-2672.2008.03878.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
54
|
Yoshimura K, Davis P, Uchida A. Invariance of Frequency Difference in Nonresonant Entrainment of Detuned Oscillators Induced by Common White Noise. ACTA ACUST UNITED AC 2008. [DOI: 10.1143/ptp.120.621] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
55
|
Uchida A, Shibayama T, Takahashi S, Hamada N, Kawata N, Tada A, Soda R, Takahashi K. 537 POSTER Detection of EGFR mutation in the sample of pleural effusion is contributive as a determinant of EGFR-TKI-therapy for the patients with lung cancer. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)72471-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
|
56
|
Uchida A, Ohtsuki T, Oonishi I. Water-soluble chlorophyll-binding protein from Chenopodium album. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308087916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
57
|
Nakamura T, Kusuzaki K, Matsubara T, Satonaka H, Shintani K, Wakabayashi T, Matsumine A, Uchida A. Histiocytic osteolysis secondary to hyperbilirubinaemia: a case report. J Orthop Surg (Hong Kong) 2008; 16:263-6. [PMID: 18725687 DOI: 10.1177/230949900801600229] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A 6-year-old boy with Alagille syndrome, characterised by marked hyperbilirubinaemia, presented with malunion of a pathological fracture of the femur with local bone atrophy and insufficient callus formation. During corrective osteotomy, it was noted that the femur was stained dark green, suggestive of bilirubin deposition. Histology of the resected bone revealed the presence of many histiocytes and osteoclast-like multinucleate giant cells containing bilirubin particles in the cytoplasm causing bone resorption. These findings suggest that bilirubin may activate macrophages to form osteoclast-like multinucleate giant cells, resulting in histiocytic osteolysis.
Collapse
Affiliation(s)
- T Nakamura
- Department of Orthopaedic Surgery, Mie University Faculty of Medicine, Tsu, Mie, Japan
| | | | | | | | | | | | | | | |
Collapse
|
58
|
Hori K, Sudo A, Wakabayashi H, Matsumine A, Kusuzaki K, Uchida A. Asymptomatic disseminated carcinomatosis of bone marrow presenting as hyperphosphatasia: report of a case. Acta Gastroenterol Belg 2008; 71:271-274. [PMID: 18720942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Metastatic involvement of the musculoskeletal system is one of the most significant clinical issues facing orthopaedic oncologists. The number of patients with metastasis to the skeletal system from a carcinoma is 15 times greater than the number of patients with primary bone tumours of all types. However, progression patterns like disseminated carcinomatosis of bone marrow are comparatively rare. The pathophysiology for disseminated carcinomatosis of bone marrow, with a prognosis reported to be very poor, is still unknown. We describe a patient who had no symptoms with hyperphosphatasia. Bone scintigraphy showed a so-called super bone scan and a needle biopsy from the ileum showed adenocarcinoma cells. Additional endoscopic investigation was performed and signet cell gastric cancer was found. From the bone scan and biopsy, we established the diagnosis of disseminated carcinomatosis of the bone marrow. From the experience of this case, we believe that intensive stomach investigation should be considered in cases with hyperphosphatasia, even when the patient has no symptoms.
Collapse
Affiliation(s)
- K Hori
- Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Mie, Japan
| | | | | | | | | | | |
Collapse
|
59
|
Hasegawa M, Nakoshi Y, Tsujii M, Sudo A, Masuda H, Yoshida T, Uchida A. Changes in biochemical markers and prediction of effectiveness of intra-articular hyaluronan in patients with knee osteoarthritis. Osteoarthritis Cartilage 2008; 16:526-9. [PMID: 17951079 DOI: 10.1016/j.joca.2007.09.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Accepted: 09/11/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Intra-articular injection of hyaluronan (HA) is frequently used to treat knee osteoarthritis (OA). We studied whether HA injections induced significant changes in levels of biochemical markers in synovial fluid (SF). In addition, we investigated the possibility of predicting the effectiveness of HA based on these biochemical markers. METHODS Twenty-eight patients with knee OA underwent five weekly intra-articular injections of HA. Knee pain was measured on visual analog scale (VAS) before and after the five injections. Levels of biochemical markers, including chondroitin 6-sulfate (C6S), chondroitin 4-sulfate (C4S), keratan sulfate (KS), and tenascin-C (TN-C), were determined before and after the five injections. Correlations between the biochemical markers before HA injection and the improvement of VAS after the five injections were evaluated. RESULTS After HA injections, levels of C6S, C4S, and KS decreased significantly. Inverse correlations were observed between the levels of TN-C and C4S before HA injection and improvement of VAS after the five injections. In contrast, no significant correlation was seen between levels of C6S and KS before injections and improvement of VAS after the five injections. CONCLUSION The reduction in C6S, C4S, and KS levels after HA injections reflects that HA could help maintain normal cartilage metabolism. Our findings suggest that HA injections are effective in patients whose knees contain low levels of TN-C and C4S, reflecting an early stage of OA and limited synovitis.
Collapse
Affiliation(s)
- M Hasegawa
- Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Mie, Japan.
| | | | | | | | | | | | | |
Collapse
|
60
|
Nakamura T, Kusuzaki K, Matsubara T, Matsumine A, Uchida A. Foreign-body granulomas in the trunk and extremities may simulate malignant soft-tissue tumors: report of three cases. Acta Radiol 2008; 49:80-3. [PMID: 18210316 DOI: 10.1080/02841850701675727] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Three cases of foreign-body granulomas arising from soft tissues of the extremities or trunk are reported. All patients had a history of having undergone surgery 19 to 35 years ago. It was difficult to distinguish these granulomas from malignant soft-tissue tumors preoperatively by magnetic resonance (MR) images, as the tumors were over 10 cm in diameter and degenerated foreign bodies could not be detected on MR images. Finally, a histological diagnosis of foreign-body granuloma was made by preoperative or intraoperative biopsy in all cases. A palpable tumor adjacent to a previous surgery scar is therefore a warning that it might represent a granuloma, in spite of various image findings.
Collapse
Affiliation(s)
- T. Nakamura
- Department of Orthopedic Surgery, Mie University Faculty of Medicine, Tsu, Mie, Japan
| | - K. Kusuzaki
- Department of Orthopedic Surgery, Mie University Faculty of Medicine, Tsu, Mie, Japan
| | - T. Matsubara
- Department of Orthopedic Surgery, Mie University Faculty of Medicine, Tsu, Mie, Japan
| | - A. Matsumine
- Department of Orthopedic Surgery, Mie University Faculty of Medicine, Tsu, Mie, Japan
| | - A. Uchida
- Department of Orthopedic Surgery, Mie University Faculty of Medicine, Tsu, Mie, Japan
| |
Collapse
|
61
|
Ogino A, Kitao H, Hirano S, Uchida A, Ishiai M, Kozuki T, Takigawa N, Takata M, Kiura K, Tanimoto M. Emergence of epidermal growth factor receptor T790M mutation during chronic exposure to gefitinib in a non small cell lung cancer cell line. Cancer Res 2007; 67:7807-14. [PMID: 17699786 DOI: 10.1158/0008-5472.can-07-0681] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The epidermal growth factor receptor (EGFR)-specific tyrosine kinase inhibitor gefitinib may provide dramatic clinical responses in some patients with pulmonary adenocarcinoma carrying activating mutations of the EGFR. However, prolonged administration of gefitinib may eventually induce acquired resistance in such patients. To gain insight into the mechanisms of this phenomenon, we placed PC-9, a cell line derived from pulmonary adenocarcinoma that has a 15-bp deletion in EGFR exon 19, under the continuous selective pressure of low levels of gefitinib without any mutagen, and established a subline that was able to grow in the presence of 2 micromol/L of gefitinib (designated RPC-9). In this cell line, about half of the reverse transcription-PCR products from mutated EGFR also carried an additional mutation (T790M). In keeping with the proposed role of T790M in abrogating gefitinib binding with EGFR, gefitinib-treated RPC-9 hardly displayed any decrease in the constitutive phosphorylation of EGFR, Akt, or Erk1/2 unlike in PC-9 cells. Interestingly, transfection of the EGFR carrying only a 15-bp deletion reversed the resistance to gefitinib in RPC-9 cells. Thus, the balance of expression levels between gefitinib-sensitive or gefitinib-resistant EGFR may govern the response to gefitinib in lung cancer.
Collapse
Affiliation(s)
- Atsuko Ogino
- Department of Hematology, Oncology, and Respiratory Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
62
|
Suehisa H, Toyooka S, Hotta K, Uchida A, Soh J, Fujiwara Y, Matsuo K, Ouchida M, Takata M, Kiura K, Date H. Epidermal Growth Factor Receptor Mutation Status and Adjuvant Chemotherapy With Uracil-Tegafur for Adenocarcinoma of the Lung. J Clin Oncol 2007; 25:3952-7. [PMID: 17761979 DOI: 10.1200/jco.2007.11.8646] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Purpose Adjuvant chemotherapy with uracil-tegafur has been demonstrated to prolong survival among patients with resected lung adenocarcinomas. Epidermal growth factor receptor (EGFR) mutations have been reported to be present in lung adenocarcinomas. The present study evaluated whether the EGFR status could be used as a biologic predictor of the outcome of adjuvant chemotherapy with uracil-tegafur. Patients and Methods The EGFR mutational status of 187 patients with resected lung adenocarcinomas was determined using a polymerase chain reaction–based assay for EGFR exons 19 and 21; the results were then correlated with the effect of adjuvant uracil-tegafur chemotherapy on survival. The antiproliferative effect of fluorouracil (FU) on adenocarcinoma cell lines with EGFR wild-type or mutant type status was examined by measuring the inhibitory concentrations at 50% (IC50s). Results Among the 187 patients, 68 received uracil-tegafur as adjuvant chemotherapy, and 119 were not treated with any chemotherapeutic agents. EGFR mutations were present in 79 patients (43%). Overall, the adjuvant chemotherapy with uracil-tegafur significantly prolonged survival compared with the control group (hazard ratio = 0.38; P = .005). The survival benefit of adjuvant chemotherapy with uracil-tegafur was also examined after stratifying the patients according to EGFR mutation status. Adjuvant chemotherapy significantly prolonged survival among patients with EGFR wild-type tumors (hazard ratio = 0.34; P = .013) but not among patients with EGFR mutant tumors. In an in vitro experiment, the IC50s of EGFR mutant cells to FU were higher than those of wild-type cells, indicating that EGFR wild-type cells are more sensitive to FU than mutant cells. Conclusion EGFR status influenced the effect of adjuvant chemotherapy with uracil-tegafur. Adjuvant chemotherapy could be customized based on EGFR status.
Collapse
Affiliation(s)
- Hiroshi Suehisa
- Department of Cancer and Thoracic Surgery, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1 Shikata-cho, Okayama, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
63
|
Kato H, Matsumine A, Wakabayashi T, Hasegawa M, Sudo A, Shintani K, Fukuda A, Kato K, Ide N, Orita S, Hasegawa T, Matsumura C, Furukawa M, Tasaki T, Sonoda H, Uchida A. Large-scale gene expression profiles, differentially represented in osteoarthritic synovium of the knee joint using cDNA microarray technology. Biomarkers 2007; 12:384-402. [PMID: 17564844 DOI: 10.1080/13547500601162482] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Osteoarthritis (OA) is one of the most common age-related chronic disorders of articular cartilage, joints and bone tissue. Diagnosis of OA commonly depends on clinical and radiographic findings. However, changes in cartilage associated with the early stage of OA cannot be detected using radiographs, because significant cartilage degeneration must occur before radiographic findings show alterations of the appearance of cartilage. To identify new biomarkers of OA, we analysed gene expression profiles of synovium from 43 patients with OA, ten patients with rheumatoid arthritis (RA), and eight non-OA/non-RA patients using a novel cDNA microarray chip. We identified 21 genes with simultaneous significant differences in expression between OA and non-OA/non-RA groups and between OA and RA groups. Linear discriminant analysis showed that the three groups could be well separated using those 21 genes. Statistical analysis also revealed that several of the 21 genes were associated with disease progression and clinical presentation. The graphical modelling method indicated that some of the 21 genes are significantly associated with a particular clinical presentation, suggesting biological relationships among those genes. This is the first report of the use of cDNA microarray technology to create large-scale gene expression profiles differentially expressed in situ in OA synovium of the knee joint.
Collapse
Affiliation(s)
- H Kato
- Department of Orthopedic Surgery, Mie University School of Medicine, Tsu-City, Mie, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
64
|
Toyooka S, Date H, Uchida A, Kiura K, Takata M. The epidermal growth factor receptor D761Y mutation and effect of tyrosine kinase inhibitor. Clin Cancer Res 2007; 13:3431; author reply 3431-2. [PMID: 17545553 DOI: 10.1158/1078-0432.ccr-07-0070] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
65
|
Seki S, Ohzeki M, Uchida A, Hirano S, Matsushita N, Kitao H, Oda T, Yamashita T, Kashihara N, Tsubahara A, Takata M, Ishiai M. A requirement of FancL and FancD2 monoubiquitination in DNA repair. Genes Cells 2007; 12:299-310. [PMID: 17352736 DOI: 10.1111/j.1365-2443.2007.01054.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The rare hereditary disorder Fanconi anemia (FA) can be caused by mutations in components of the FA core complex (FancA/B/C/E/F/G/L/M), a key regulator FancD2, the breast cancer susceptibility protein BRCA2/FancD1, or the newly identified FancJ/BRIP1 helicase. By performing yeast two-hybrid (Y2H) screens using N-terminal chicken (ch) FancD2 as a bait, we have identified chFancL, the likely ubiquitin E3 ligase subunit of the FA core complex. We also found that ectopically expressed FancD2 and FancL co-immunoprecipitated in 293T cells, and this interaction was dependent on the PHD domain of FancL. FANCL-disrupted chicken DT40 cells displayed defects in both FancD2 monoubiquitination and focus formation. Importantly, cell lines lacking the FANCL or FANCD2 genes, or carrying a "knock-in" mutation of the FancD2 monoubiquitination site (where the Lys 563 residue is changed to Arg), displayed quantitatively identical defects in the repair of I-SceI-induced chromosomal breaks by homologous recombination (HR). These data establish the role of FANCL and FancD2 monoubiquitination in HR repair.
Collapse
Affiliation(s)
- Sohsuke Seki
- Department of Immunology and Molecular Genetics, Kawasaki Medical School, Kurashiki, Okayama 701-0192, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
66
|
Abstract
We report a 72-year-old woman with a type-1 intra-osseous ganglion in the proximal humerus, extending to the bone surface. We conducted a systemic review of intra-osseous ganglion cases in Japan to identify clinical features and pathogenesis of this condition. The anatomical distribution between intra-osseous ganglia without a communicating soft tissue ganglion (type 1) and those with (type 2) is different. The origins of intra-osseous ganglia vary and depend on their anatomical location. They can arise from within the bone or in the adjacent soft tissue, and can progress to a type-2 lesion in either an outside-in or inside-out fashion.
Collapse
Affiliation(s)
- T Nishimura
- Department of Orthopaedic Surgery, Mie University Faculty of Medicine, Mie, Japan.
| | | | | | | | | | | |
Collapse
|
67
|
Toyooka S, Uchida A, Shigematsu H, Soh J, Ogino A, Takata M, Kiura K, Ouchida M, Kosaka T, Aoe M, Mitsudomi T, Date H. The Effect of Gefitinib on B-RAF Mutant Non-small Cell Lung Cancer and Transfectants. J Thorac Oncol 2007; 2:321-4. [PMID: 17409805 DOI: 10.1097/01.jto.0000263716.92191.be] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We previously reported one patient with squamous cell carcinoma of the lung that showed the long-term effect to gefitinib with complete response. In the present report, we examine the epidermal growth factor receptor (EGFR) and K-RAS, HER2, and B-RAF mutations in this patient to find a B-RAF exon11 mutation, resulting in a substitution of valine by phenylalanine at codon 470 (V470F) as a novel type of B-RAF mutation in human cancers. In addition, the fluorescence in situ hybridization analysis for EGFR showed the high polysomy status. B-RAF is a nonreceptor serine/threonine kinase whose kinase domain has a structure similar to other protein kinases, including EGFR members. Of interest, the B-RAF V470F mutation corresponds to a position similar to the EGFR G719X mutation located on the phosphate binding (P)-loop of EGFR that clamps ATP into the catalytic cleft. This observation suggests that gefitinib may have an anti-cancer effect on B-RAF mutant tumors. Indeed, previous reports demonstrated that H1666 cells harboring B-RAF G465V mutations showed sensitivity to gefitinib, inhibiting phosphorylation of ERK1/2. We examined the effect of gefitinib on transient transfectants of the B-RAF mutant, but no drastic inhibition of ERK1/2 phosphorylation that was one of the downstream molecules of B-RAF was induced by gefitinib. In summary, we found a novel B-RAF V470F mutation in lung squamous cell carcinoma that showed response to gefitinib. However, our in vitro investigation did not explain the response observed in this particular patient. Further investigation is necessary to elucidate the mechanism of tumor sensitivity to EGFR tyrosine kinase inhibitors.
Collapse
MESH Headings
- Blotting, Western
- Carcinoma, Non-Small-Cell Lung/drug therapy
- Carcinoma, Non-Small-Cell Lung/genetics
- Carcinoma, Non-Small-Cell Lung/pathology
- Carcinoma, Squamous Cell/drug therapy
- Carcinoma, Squamous Cell/genetics
- Carcinoma, Squamous Cell/pathology
- DNA Mutational Analysis
- ErbB Receptors/drug effects
- ErbB Receptors/genetics
- Female
- Gefitinib
- Gene Expression Regulation, Neoplastic
- Genes, ras/drug effects
- Genes, ras/genetics
- Humans
- Lung Neoplasms/drug therapy
- Lung Neoplasms/genetics
- Lung Neoplasms/pathology
- Male
- Middle Aged
- Mutation
- Proto-Oncogene Proteins B-raf/drug effects
- Proto-Oncogene Proteins B-raf/genetics
- Quinazolines/pharmacology
- Quinazolines/therapeutic use
- Receptor, ErbB-2/drug effects
- Receptor, ErbB-2/genetics
- Sensitivity and Specificity
- Transfection
- Tumor Cells, Cultured/drug effects
Collapse
Affiliation(s)
- Shinichi Toyooka
- Department of Cancer and Thoracic Surgery, Graduate School of Medicine, Okayama University, Okayama, Japan.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
68
|
Uchida A, Hirano S, Kitao H, Ogino A, Rai K, Toyooka S, Takigawa N, Tabata M, Takata M, Kiura K, Tanimoto M. Activation of downstream epidermal growth factor receptor (EGFR) signaling provides gefitinib-resistance in cells carrying EGFR mutation. Cancer Sci 2007; 98:357-63. [PMID: 17270025 DOI: 10.1111/j.1349-7006.2007.00387.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Patients with pulmonary adenocarcinoma carrying the epidermal growth factor receptor (EGFR) mutation tend to display dramatic clinical response to treatment with the EGFR tyrosine kinase inhibitor gefitinib. Unfortunately, in many cases the cancer cells eventually acquire resistance, and this limits the duration of efficacy. To gain insight into these acquired resistance mechanisms, we first prepared HEK293T cell line stably transfected with either wild-type (WT) or mutant (L858R) EGFR, and then expressed oncogenic K-Ras12V mutant in the latter transfectant. Although 293T cells expressing wild-type EGFR did not show any growth inhibition by gefitinib treatment similarly to the non-transfected cells, the cells expressing the EGFR-L858R were exquisitely sensitive. Consistently, phospho-Akt levels were decreased in response to gefitinib in cells expressing EGFR-L858R but not in cells with EGFR-WT. In contrast, 293T cells expressing both EGFR-L858R and oncogenic K-Ras were able to proliferate even in the presence of high concentration of gefitinib probably by inducing Erk1/2 activation. We also expressed K-Ras12V in the gefitinib-sensitive pulmonary adenocarcinoma cell line PC-9, which harbors an in-frame deletion in the EGFR gene. The activated K-Ras inhibited the effects of gefitinib treatment on cell growth, cell death induction and levels of phospho-Akt, as well as phospho-Erk. These data indicate that activated Ras could substitute most of the upstream EGFR signal, and are consistent with the hypothesis that mutational activation of targets immediately downstream from the EGFR could induce the secondary resistance to gefitinib in patients with lung cancer carrying EGFR mutation.
Collapse
Affiliation(s)
- Akiko Uchida
- Department of Hematology, Oncology and Respiratory Medicine, Graduate School of Medicine and Dentistry, Okayama University, Okayama, Okayama 700-8558, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
69
|
Mitani K, Fujioka M, Uchida A, Kataoka H. Analysis of abietic acid and dehydroabietic acid in food samples by in-tube solid-phase microextraction coupled with liquid chromatography-mass spectrometry. J Chromatogr A 2007; 1146:61-6. [PMID: 17306277 DOI: 10.1016/j.chroma.2007.01.118] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2006] [Revised: 01/20/2007] [Accepted: 01/25/2007] [Indexed: 11/30/2022]
Abstract
A simple and sensitive method for the determination of abietic acid and dehydroabietic acid in food samples was developed using a fully automated method consisting of in-tube solid-phase microextraction (SPME) coupled with liquid chromatography-mass spectrometry (LC/MS). These compounds were separated within 5min by HPLC using an ODS-3 column and 5mM ammonium formate/acetonitrile (10/90, v/v). Electrospray ionization conditions in the negative ion mode were optimized for MS detection of abietic acid and dehydroabietic acid. The optimum in-tube SPME conditions were 20draw/eject cycles of 40microL of sample using a Supel Q PLOT capillary column as an extraction device. The extracted compounds were easily desorbed from the capillary by passage of the mobile phase, and no carryover was observed. Using the in-tube SPME LC/MS method, good linearity of the calibration curve (r>0.9998) was obtained in the concentration range from 0 to 50ng/mL, and the detection limits (S/N=3) of abietic acid and dehydroabietic acid were 2.9 and 2.1pg/mL, respectively. The in-tube SPME method showed above 75-fold greater sensitivity than the direct injection method (5microL injection). This method was applied successfully to analysis of food samples without interference peaks. The recoveries of abietic acid and dehydroabietic acid spiked into liquid samples were above 79%, and the relative standard deviations were below 6.6%. These compounds were detected at ng/mL or ng/g levels in various liquid or solid food samples contacted with paper.
Collapse
Affiliation(s)
- K Mitani
- School of Pharmacy, Shujitsu University, Nishigawara, Okayama 703-8516, Japan
| | | | | | | |
Collapse
|
70
|
Ogawa Y, Hossain RZ, Ogawa T, Yamakawa K, Yonou H, Oshiro Y, Hokama S, Morozumi M, Uchida A, Sugaya K. Vitamin B6 deficiency augments endogenous oxalogenesis after intravenous l-hydroxyproline loading in rats. ACTA ACUST UNITED AC 2007; 35:15-21. [PMID: 17200872 DOI: 10.1007/s00240-006-0076-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Accepted: 12/01/2006] [Indexed: 10/23/2022]
Abstract
The effects of an intravenous hydroxyproline load on endogenous oxalogenesis were compared in rats fed a standard diet or a vitamin B6-deficient diet. Twelve male Wistar rats were randomized to two groups and were fed either a standard diet (control group) or a vitamin B6-deficient diet for 3 weeks. Then the animals were intravenously administered 100 mg (762.6 micromol)/ml hydroxyproline. In the control group, infusion of hydroxyproline increased the 5-h urinary oxalate and glycolate excretion above baseline to 0.27% (2.02 +/- 1.11 micromol) and 0.32% (2.43 +/- 1.60 micromol) of the administered dose (mol/mol), while it was respectively 2.01% (15.24 +/- 2.13 micromol) and 0.00% (-0.02 +/- 0.19 micromol) of the dose in the vitamin B6-deficient group. Therefore, vitamin B6 deficiency augmented endogenous synthesis of oxalate from hydroxyproline by 7.56-fold (15.24/2.02) compared with that in the control group. Urinary citrate excretion was significantly lower at baseline and all other times in the vitamin B6-deficient group compared with the control group. In conclusions, L-hydroxyproline loading augmented endogenous oxalogenesis in the vitamin B6-deficient group without causing hyperglycolic aciduria, and also led to significant hypocitraturia. These findings suggest that hydroxyproline is not metabolized to oxalate via glycolate, but rather via the 4-hydroxyglutamate to glyoxylate pathway (usually requiring vitamin B6-dependent enzymes) even in the presence of vitamin B6 deficiency.
Collapse
Affiliation(s)
- Y Ogawa
- Department of Urology, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa, 903-0215, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
71
|
Tomioka R, Uchida A, Takenaka C, Tezuka T. Effect of aluminum on nitrate reductase and photosynthetic activities in Quercus serrata seedlings. Environ Sci 2007; 14:157-65. [PMID: 17622220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We investigated the physiological effect of rhizospheric aluminum (Al) on the activities of nitrate reductase and photosynthesis in Quercus serrata seedlings. The seedlings were cultured hydroponically in nutrient solution with or without 1 mM AlCl(3) (pH 4.0) for 14 days. After Al treatment for 3 days, the number of primordia of tertiary lateral roots on secondary lateral roots appeared to increase. As a result, the biomass of the roots significantly increased (by 5%) after Al treatment for 14 days. The uptake of NO(3)(-) by the seedlings from the culture medium was stimulated to 125% by Al treatment for 3 days. Al treatments for 7 and 14 days increased the nitrate reductase activities in the roots to 300% and 170%, respectively. Al treatment had no effect on photosynthetic activity or shoot biomass even after 14 days, although the chlorophyll content was slightly increased by Al treatment. These results suggest that the stimulation of root growth by Al might be closely related to metabolic changes including the increase in nitrate reductase activity in the leaves and roots.
Collapse
Affiliation(s)
- Rie Tomioka
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusaku, Nagoya, Aichi 464-8601, Japan.
| | | | | | | |
Collapse
|
72
|
Abstract
OBJECTIVE We examined age associated variation in salivary testosterone values among Japanese males as well as anthropometric measurements. METHODS Salivary samples were collected in pretreated sodium azide treated tubes. The first series: 15-79-year-old males (n = 99); two morning and two evening samples were collected at home for two days. The second series: 90-year-old males (n = 29); one morning sample was collected. Testosterone values were determined using an iodine125-based radioimmunoassay kit modified for saliva. RESULTS Results show 1) a significant decrease in salivary testosterone values from 20s to 40s and older, 2) no significant decline after 40 through 90 years old, 3) no significant age-related differences in the degree of intraindividual diurnal fluctuation across age groups of 40-70s, and 4) higher BMI is associated with the lower salivary testosterone among 40-70s. CONCLUSIONS These results suggest that neither a constant decrease of salivary testosterone values or markedly reduced intraindividual fluctations are universal aspects of aging. Older males may maintain relatively high testosterone levels compared to younger men and a relatively 'robust' neuroendocrinological system.
Collapse
Affiliation(s)
- Akiko Uchida
- School of International Liberal Studies, Waseda University, Japan.
| | | | | | | | | | | | | |
Collapse
|
73
|
Nishimura A, Hasegawa M, Sudo A, Uchida A. Osteonecrosis of the femoral head caused by bone marrow blockage: a case report. J Orthop Surg (Hong Kong) 2006; 14:330-2. [PMID: 17200539 DOI: 10.1177/230949900601400319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Interruption of the blood flow may occur in intra-osseous arteries within the femoral head. We report a 72-year-old woman who developed osteonecrosis of the femoral head 11 months after surgery involving massive cementing of a segmental distal femoral rotating hinge prosthesis to treat nonunion of the distal femur. The bone cement filled the cavity up to the femoral neck and the superolateral portion of the femoral head, blocking the bone marrow.
Collapse
Affiliation(s)
- A Nishimura
- Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu City, Mie, Japan
| | | | | | | |
Collapse
|
74
|
Abstract
Transient osteoporosis of the hip is a disorder characterised by pain, and associated with temporary osteopaenia. Although osteopaenia is the essence of the condition, data do not exist about the local bone density of the femoral neck if no medication is administered. We describe three patients who were treated with limitation of weight-bearing only. Repeated bone mineral density measurements were obtained, and that at the femoral neck was lowest two months after the onset of the condition. The mean reduction in bone mineral density when compared with an age-matched control group was 13% (3% to 24%). Spontaneous recovery was observed in all patients.
Collapse
Affiliation(s)
- R Niimi
- Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu City, Mie 514-8507, Japan
| | | | | | | | | |
Collapse
|
75
|
Abstract
A modular layered acetabular component (metal-polyethylene-ceramic) was developed in Japan for use in alumina ceramic-on-ceramic total hip replacement. Between May 1999 and July 2000, we performed 35 alumina ceramic-on-ceramic total hip replacements in 30 consecutive patients, using this layered component and evaluated the clinical and radiological results over a mean follow-up of 5.8 years (5 to 6.5). A total of six hips underwent revision, one for infection, two for dislocation with loosening of the acetabular component, two for alumina liner fractures and one for component dissociation with pelvic osteolysis. There were no fractures of the ceramic heads, and no loosening of the femoral or acetabular component in the unrevised hips was seen at final follow-up. Osteolysis was not observed in any of the unrevised hips. The survivorship analysis at six years after surgery was 83%. The layered acetabular component in our experience, has poor durability because of unexpected mechanical failures including alumina liner fracture and component dissociation.
Collapse
Affiliation(s)
- M Hasegawa
- Department of Orthopaedic Surgery, Mie University Graduate, School of Medicine, 2-174, Edobashi, Tsu City, Mie 514-8507, Japan.
| | | | | |
Collapse
|
76
|
Wada H, Kobayashi T, Abe Y, Hatada T, Yamada N, Sudo A, Uchida A, Nobori T. Elevated levels of soluble fibrin or D-dimer indicate high risk of thrombosis. J Thromb Haemost 2006; 4:1253-8. [PMID: 16706968 DOI: 10.1111/j.1538-7836.2006.01942.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND Fibrin-related markers such as soluble fibrin (SF) and D-dimer are considered useful for the diagnosis of thrombosis. However, the evidence for diagnosis of thrombosis by fibrin-related markers is not well-established. OBJECTIVE To evaluate the cutoff values of D-dimer and SF in the diagnosis of thrombosis. PATIENTS AND METHODS Plasma concentrations of SF and D-dimer were measured in 784 inpatients suspected of having thrombosis between 1 August 2003 and 31 December 2004, and then correlated with thrombosis. RESULTS AND CONCLUSIONS Plasma concentrations of D-dimer and SF were significantly higher in patients with disseminated intravascular coagulation (DIC), deep vein thrombosis (DVT) and cerebral thrombosis, compared with those in patients without thrombosis. When cutoff values of > 3.0 microg mL(-1) for D-dimer and > 6.0 microg mL(-1) for SF were used for the diagnosis, more than 50% of patients (with the exception of liver transplant patients and postoperative patients) had thrombosis. Receiver operating characteristic analysis showed that SF was more useful than D-dimer for the diagnosis of thrombosis (i.e. DVT and DIC). The cutoff value of D-dimer (7.87 microg mL(-1)) was the same for DVT and DIC, while that of SF was slightly lower for DVT (7.05 microg mL(-1)) than for DIC (8.60 microg mL(-1)). Our findings suggest that high levels of plasma fibrin-related markers reflect high risk for thrombosis.
Collapse
Affiliation(s)
- H Wada
- Department of Molecular and Laboratory Medicine, Mie University Graduate School of Medicine, Edobashi, Tsu, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
77
|
Matsuo K, Kiura K, Tabata M, Uchida A, Hotta K, Niiya D, Kubonishi S, Ogino A, Fujiwara Y, Nakajima H, Shinagawa K, Ishimaru F, Ueoka H, Tanimoto M. Clustered incidence of acute promyelocytic leukemia during gefitinib treatment for non-small-cell lung cancer: experience at a single institution. Am J Hematol 2006; 81:349-54. [PMID: 16628731 DOI: 10.1002/ajh.20569] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Although gefitinib, an epidermal growth factor receptor tyrosine kinase inhibitor, has been shown a significant activity for recurrent non-small-cell lung cancer (NSCLC), its long-term adverse effect with its continuous usage has hitherto not been clearly elucidated. Subjects were 108 consecutive NSCLC cases who were treated with gefitinib between November 2001 and December 2004 at our single institution. A crude incidence rate ratio was calculated by ratio of crude incidence rate in our subject to population-based incident rate of all leukemia (ICD: C91-95) in the same region. The 95% confidence intervals (CIs) were calculated based upon a Poisson distribution. Three cases of acute promyelocytic leukemia (APL) occurred during gefitinib treatment, and these patients' past treatment histories are presented herein. No other malignancy was identified. All of the cases were diagnosed at the stage of mild-to-moderate cytopenia, especially thrombocytopenia, without disseminated intravascular coagulation. All presented a normal karyotype with positive PML-RARalpha in RT-PCR, indicating submicroscopic translocation. They responded well to APL treatments, including all-trans-retinoic acid. The crude incident rate ratio was 639.9 (95% confidence interval: 131.6-1,878.9, P < 0.0001) when the APL incidence in this cohort was compared to all leukemia cases in the general population in the same district in Japan. Thus we had three cases of secondary APL patients within the gefitinib-treated NSCLC cohort. Although we cannot exclude an effect of past exposure of other cytotoxic agents and radiotherapy as a cause of APL, APL inducibility of gefitinib should be clarified in the further study.
Collapse
Affiliation(s)
- Keitaro Matsuo
- Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
78
|
Kasai Y, Kawakita E, Uchida A. Clinical profile of long-term survivors of breast or thyroid cancer with metastatic spinal tumours. Int Orthop 2006; 31:171-5. [PMID: 16639592 PMCID: PMC2267556 DOI: 10.1007/s00264-006-0145-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2006] [Accepted: 03/21/2006] [Indexed: 10/24/2022]
Abstract
Patients with breast or thyroid cancer with metastatic spinal tumours are expected to survive relatively longer than patients with other cancers with metastatic spinal tumours. The purpose of this study was to determine the clinical characteristics of long-term survivors of breast or thyroid cancer with metastatic spinal tumours. We studied the clinical profile of long-term survivors by comparing the characteristics of nine patients who had survived for at least 5 years after a spinal operation with the characteristics of 16 patients who had not. Our results showed that the longer the time from the diagnosis of the primary cancer to the spinal operation, the longer patients with breast or thyroid cancer and metastatic spinal tumours would survive. Six of the eight patients (75.0%) who had undergone the spinal operation at least 5 years after the diagnosis of the primary cancer survived especially long. In conclusion, the duration from the diagnosis of the primary cancer to the spinal operation is very useful for predicting a prognosis in patients with breast or thyroid cancer and metastatic spinal tumours.
Collapse
Affiliation(s)
- Y Kasai
- Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan.
| | | | | |
Collapse
|
79
|
Tsujii M, Hirata H, Yoshida T, Imanaka-Yoshida K, Morita A, Uchida A. Involvement of tenascin-C and PG-M/versican in flexor tenosynovial pathology of idiopathic carpal tunnel syndrome. Histol Histopathol 2006; 21:511-8. [PMID: 16493581 DOI: 10.14670/hh-21.511] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Increased intra-carpal-tunnel pressure due to swelling of the flexor tenosynovium is the most probable pathological mechanism of idiopathic carpal tunnel syndrome (CTS). To clarify the role of tenascin-C and PG-M/versican, which have often been found to be involved in tissue remodeling and vascular stenosis in the pathogenesis of CTS, we histologically and biochemically examined the production of extracellular matrix in the flexor tenosynovium from 40 idiopathic CTS patients. Tenascin-C was temporarily expressed in the vessel wall, synovial lining and fibrous tissue, with expression regulated differently in each tissue. Tenascin-C expression by vessels correlated with disease duration and appeared to be involved in vascular lesion pathology. Morphometric analysis showed that tenascin-C expression by small arteries is correlated with PG-M/versican expression in surrounding connective tissue. PG-M/versican was also present at the neointima of severely narrowed vessels. Although tenascin-C expression by synovial lining and connective tissue shows marked regional variation and seems inconsistent, in vitro examination suggested that tenascin-C production by these tissues is regulated in response to mechanical strain on the flexor tenosynovium.
Collapse
Affiliation(s)
- M Tsujii
- Department of Orthopaedic Surgery, Faculty of Medicine, Mie University, Tsu, Mie, Japan
| | | | | | | | | | | |
Collapse
|
80
|
Horikawa K, Kasai Y, Yamakawa T, Sudo A, Uchida A. Prevalence of osteoarthritis, osteoporotic vertebral fractures, and spondylolisthesis among the elderly in a Japanese village. J Orthop Surg (Hong Kong) 2006; 14:9-12. [PMID: 16598079 DOI: 10.1177/230949900601400103] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
PURPOSE To study the prevalence of osteoarthritis, osteoporotic vertebral fractures, and spondylolisthesis among elderly residents of a Japanese village and to examine the correlation between radiographic evidence of abnormality and lower back pain. METHODS 205 men (mean age, 70.7 years) and 323 women (mean age, 70.5 years) in a Japanese village participated in this cross-sectional study. Plain lateral radiographs were taken from the lower thoracic spine to the sacral spine. They were evaluated by 3 independent orthopaedic surgeons for degree of osteoarthritis (using Weiner grading system) and the presence of osteoporotic vertebral fractures and spondylolisthesis. RESULTS The prevalence of osteoarthritis in elderly Japanese villagers was 38.3%, whereas that of osteoporotic vertebral fractures and spondylolisthesis was 17.8% and 8.9%, respectively. There was no significant difference in osteoarthritis between men and women, but osteoporotic vertebral fractures and spondylolisthesis were significantly more common in females (p<0.01). No significant correlation was observed between lower back pain and radiographic evidence of degenerative spinal disease. CONCLUSION The prevalence of spondylolisthesis in elderly Japanese was much lower than that in whites or African Americans. The prevalence of osteoarthritis or osteoporotic vertebral fractures was comparable with other English or US studies. Radiographic evidence of osteoarthritis, osteoporotic vertebral fractures, and spondylolisthesis is not necessarily associated with lower back pain.
Collapse
Affiliation(s)
- K Horikawa
- Department of Orthopaedic Surgery, Faculty of Medicine, Mie University, Mie, Japan
| | | | | | | | | |
Collapse
|
81
|
Niimi R, Matsumine A, Kusuzaki K, Okamura A, Matsubara T, Uchida A, Fukutome K. Soft-tissue sarcoma mimicking large haematoma: a report of two cases and review of the literature. J Orthop Surg (Hong Kong) 2006; 14:90-5. [PMID: 16598096 DOI: 10.1177/230949900601400120] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We report on 2 patients with soft-tissue sarcomas mimicking large haematomas. Neither patient had a medical history of trauma or bleeding tendency. In a patient with a large leiomyosarcoma in the buttock, insufficient biopsy material from initial surgeries precluded a correct diagnosis. In the second patient with epithelioid sarcoma of the forearm, fasciotomy was repeatedly performed for compartment syndrome arising from the tumour. It is important to reconfirm prior trauma and investigate the clinical course and images of patients with an unusual history of haematoma in the extremities. The possibility of a malignant tumour should be suspected, and repeated biopsies should be performed if necessary.
Collapse
Affiliation(s)
- R Niimi
- Department of Orthopaedic Surgery, Mie University Faculty of Medicine, Mie, Japan
| | | | | | | | | | | | | |
Collapse
|
82
|
Matsumine A, Kusuzaki K, Hirata H, Fukutome K, Maeda M, Uchida A. Intraneural metastasis of a synovial sarcoma to a peripheral nerve. J Bone Joint Surg Br 2005. [PMID: 16260679 DOI: 10.1302/0301-620x.8711.16522] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We describe a case of intraneural metastasis of a synovial sarcoma, the first published case of a metastasis of a soft-tissue sarcoma to a peripheral nerve.
Collapse
Affiliation(s)
- A Matsumine
- Department of Orthopaedic Surgery, Mie University School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan.
| | | | | | | | | | | |
Collapse
|
83
|
Abstract
We describe a case of intraneural metastasis of a synovial sarcoma, the first published case of a metastasis of a soft-tissue sarcoma to a peripheral nerve.
Collapse
Affiliation(s)
- A Matsumine
- Department of Orthopaedic Surgery, Mie University School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan.
| | | | | | | | | | | |
Collapse
|
84
|
Ohtsuki T, Satoh H, Ohshima S, Uchida A. Structural studies of water-soluble chlorophyll protein from Chenopodium album. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305088598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
85
|
Uchida A, Sakurai R, Hattori T, Yamaura M. Epimerization of α-amino nitriles to single stereoisomers in the solid state. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305087520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
86
|
Horigome D, Hara H, Satoh H, Nakagawa A, Uchida A. A novel chlorophyll-binding mode of water-soluble chlorophyll protein (WSCP). Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305088495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
87
|
Abstract
OBJECTIVES To investigate the incidence and pattern of injuries, relative risks, and factors affecting incidence among elite motorcycle competitors in Japan. METHODS A total of 117 elite motorcycle competitors including 36 road racers, 60 motocross racers, and 21 trial bike riders completed a questionnaire about injuries. RESULTS Sixty major injuries (25 in road racing, 32 in motocross, and three in trial bike riding) were reported. The most common injuries were fractures (45), followed by ligament injuries (8), dislocations (5), and soft tissue injuries (2). The overall injury rate was 22.4 per 1000 hours, and the death rate was zero. There was no significant correlation between risk of injury and age, experience, or accumulated competition points. CONCLUSIONS Injury rates in competitions such as road racing and motocross are high, and therefore additional safety measures are needed to protect competitors from injury.
Collapse
Affiliation(s)
- Y Tomida
- Department of Orthopaedic Surgery, Suzuka Kaisei General Hospital, Tsu City, Japan
| | | | | | | | | | | | | |
Collapse
|
88
|
Uchida A, Tabata M, Kiura K, Tanimoto Y, Kanehiro A, Aoe M, Ohohara N, Ueoka H, Tanimoto M. Successful treatment of pulmonary artery sarcoma by a two-drug combination chemotherapy consisting of ifosfamide and epirubicin. Jpn J Clin Oncol 2005; 35:417-9. [PMID: 15976070 DOI: 10.1093/jjco/hyi106] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We describe a case of 63-year-old woman with pulmonary artery sarcoma successfully treated with chemotherapy. She developed acute shortness of breath, and left chest and shoulder pain. Although a diagnosis of acute pulmonary embolism was made at a local hospital and she received anticoagulation and thrombolysis therapy, no improvement was achieved. Thereafter, she underwent a pulmonary thromboectomy in our hospital, and the histological diagnosis was intimal sarcoma of the pulmonary artery. Since post-operative computed tomography (CT) scans of the chest showed obvious persistence of an intraluminal hypoattenuated area in the left main pulmonary artery, the patient was treated with four cycles of a doublet chemotherapy consisting of ifosfamide (2.5 g/m(2)/day) on days 1-5 and epirubicin (45 mg/m(2)/day) on days 2 and 3. CT scans of the chest after four cycles showed marked regression of the intraluminal hypoattenuated area in the left main pulmonary artery. This is the first case of pulmonary artery sarcoma responding to chemotherapy. Surgical resection is currently the most hopeful treatment for pulmonary artery sarcoma. However, intensive chemotherapy is worth trying in unresectable patients.
Collapse
Affiliation(s)
- Akiko Uchida
- Department of Hematology, Oncology and Respiratory Medicine Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama 700-8558, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
89
|
Uchida A, Tabata M, Matsuo K, Ogino A, Fujiwara Y, Hotta K, Shinagawa K, Kiura K, Ueoka H, Tanimoto M. Incidence of acute promyelocytic leukemia during gefitinib treatment for advanced non-small cell lung cancer. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.7189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- A. Uchida
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - M. Tabata
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - K. Matsuo
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - A. Ogino
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - Y. Fujiwara
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - K. Hotta
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - K. Shinagawa
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - K. Kiura
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - H. Ueoka
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| | - M. Tanimoto
- Okayama Univ Grad Sch of Med and Dent, Okayama, Japan; Okayama Univ Hosp, Okayama, Japan; Aichi Cancer Ctr Research Inst, Nagoya, Japan
| |
Collapse
|
90
|
Hotta K, Takigawa N, Kiura K, Tabata M, Umemura S, Ogino A, Uchida A, Bessho A, Segawa Y, Shinkai T, Nogami N, Harita S, Okimoto N, Ueoka H, Tanimoto M. Phase I study of irinotecan and amrubicin in patients with advanced non-small-cell lung cancer. Anticancer Res 2005; 25:2429-34. [PMID: 16080470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
BACKGROUND Combination chemotherapy of irinotecan and amrubicin for advanced non-small cell lung cancer (NSCLC) has not been fully evaluated. To determine the maximum-tolerated dose (MTD), a phase I study in patients with advanced NSCLC was conducted. MATERIALS AND METHODS Patients with stage IIIB/IV NSCLC were enrolled in this study. Both patients with and without prior chemotherapy were also eligible. The drugs were administered on days 1 and 8, every 3 weeks. The starting doses of irinotecan and amrubicin were 60 and 35 mg/m2, respectively. RESULTS Nineteen patients received a total of 53 courses. Grade 4 neutropenia was observed in 23% of courses. Anaemia and thrombocytopenia were generally mild. Grade 3 febrile neutropenia occurred in 5 courses. Other grade 3 or greater non-haematological toxicities were observed in only 4 out of 52 courses (grade 3 infection and hyponatremia). The maximum-tolerated doses (MTDs) of irinotecan and amrubicin were 100 and 45 mg/m2, respectively. Objective response was obtained in 2 patients (10.5%), who had received prior chemotherapy. CONCLUSION This combination was well tolerated, but produced only a modest anti-tumour effect for advanced NSCLC. Further investigation into the role of this regimen as a salvage chemotherapy may be warranted in relapsed patients.
Collapse
Affiliation(s)
- Katsuyuki Hotta
- Department of Medicine II, Okayama University Medical School, 2-5-1, Shikata-cho, Okayama, 700-8558, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
91
|
Abstract
PURPOSE To assess the vascularity of the femoral head and determine how it is related to the destruction of the arthritic hip joint. The process of destructive arthropathy in arthritic hip joints is variable. Some patients with osteoarthritis of the hip have rapidly progressive destructive changes resulting in the disappearance of the femoral head. METHOD Six femoral heads from patients diagnosed with rapidly destructive arthropathy and 6 femoral heads from patients with secondary osteoarthritis caused by acetabular dysplasia were analysed to reveal the association between blood capillaries and osteoclasts. The von Willebrand Factor immunostaining and counterstaining with Mayer's haematoxylin were used to label the microvessels and osteoclasts in formalin-fixed, paraffin-embedded specimens of femoral heads. The numbers of immunostained microvessels and osteoclasts in selected regions were counted. RESULT The microvascular density of the bone surfaces of rapidly progressive arthritic hips was hypervascular. Osteoclasts were also found in increased numbers on the bone surfaces of rapidly progressive arthritic hips. The higher microvascular density coincided with extensive bone destruction and with the increased osteoclast count. CONCLUSION These findings suggested that hypervascularity of the granulation in the femoral head may be associated with bone and joint destruction.
Collapse
Affiliation(s)
- T Yamakawa
- Department of Orthopedic Surgery, Mie University Faculty of Medicine, Mie University Hospital, Tsu, Mie, Japan.
| | | | | | | |
Collapse
|
92
|
|
93
|
Kasai Y, Shi D, Sugimoto T, Takegami K, Uchida A. Outcome of late surgical treatment in patients with incomplete paraplegia due to spinal degenerative diseases. Spinal Cord 2004; 43:171-4. [PMID: 15534624 DOI: 10.1038/sj.sc.3101676] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
STUDY DESIGN Retrospective analysis. OBJECTIVE To assess the outcome of late surgical intervention in patients with incomplete paraplegia due to spinal degenerative diseases. SETTING Three men and four women with cervical or thoracic spinal degenerative diseases, who preoperatively were unable to walk for more than 6 months in Mie prefecture, Japan. METHODS Review of clinical records and questionnaire survey regarding the walking ability of patients 2 years after surgery. RESULTS All seven patients were unable to walk postoperatively. CONCLUSION A late surgical intervention may not lead to functional recovery in patients with spinal degenerative disease who were unable to walk for at least 6 months.
Collapse
Affiliation(s)
- Y Kasai
- Department of Orthopaedic Surgery, Faculty of Medicine, Mie University, Mie prefecture, Japan
| | | | | | | | | |
Collapse
|
94
|
Matsumine A, Kusuzaki K, Ueda T, Okamura A, Uchida A. Small leucine-rich proteoglycan, decorin expression as a biomarker of outcome in soft tissue tumor. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.9052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- A. Matsumine
- Mie University School of Medicine, Tsu-city, Mie, Japan; Osaka University, Osaka, Japan
| | - K. Kusuzaki
- Mie University School of Medicine, Tsu-city, Mie, Japan; Osaka University, Osaka, Japan
| | - T. Ueda
- Mie University School of Medicine, Tsu-city, Mie, Japan; Osaka University, Osaka, Japan
| | - A. Okamura
- Mie University School of Medicine, Tsu-city, Mie, Japan; Osaka University, Osaka, Japan
| | - A. Uchida
- Mie University School of Medicine, Tsu-city, Mie, Japan; Osaka University, Osaka, Japan
| |
Collapse
|
95
|
Matsumine A, Myoui A, Kusuzaki K, Araki N, Seto M, Yoshikawa H, Uchida A. Calcium hydroxyapatite ceramic implants in bone tumour surgery. A long-term follow-up study. J Bone Joint Surg Br 2004; 86:719-25. [PMID: 15274270 DOI: 10.1302/0301-620x.86b5.14242] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
We reviewed the results of 51 patients with benign bone tumours treated by curettage and implantation of calcium hydroxyapatite ceramic (CHA). The mean follow-up was 11.4 years (10 to 15.5). Post-operative fractures occurred in two patients and three had local recurrences; three had slightly limited movement of the adjacent joint and one had mild osteoarthritis. There were no allergic or neoplastic complications. In all cases, radiographs showed that the CHA was well incorporated into the host bone. Statistical analysis showed that absorption of the implanted CHA was greater in males (odds ratio, 6.2; 95% CI, 1.6 to 23.7) and younger patients (odds ratio, 0.6 for increase in age of 10 years; 95% CI, 0.91 to 0.99). However, the implanted CHA was not completely absorbed in any patient. We conclude that CHA is a useful and safe bone substitute for the treatment of benign bone tumours.
Collapse
Affiliation(s)
- A Matsumine
- Department of Orthopaedic Surgery, Mie University School of Medicine, Tsu-city, Japan
| | | | | | | | | | | | | |
Collapse
|
96
|
Uchida A, Shibasaki N, Nogawa S, Yoshimori S. Transient characteristics of chaos synchronization in a semiconductor laser subject to optical feedback. Phys Rev E Stat Nonlin Soft Matter Phys 2004; 69:056201. [PMID: 15244898 DOI: 10.1103/physreve.69.056201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2002] [Revised: 01/09/2004] [Indexed: 05/24/2023]
Abstract
We have investigated the transient characteristics of two types of chaos synchronization in a semiconductor laser subject to optical feedback: complete synchronization and strong injection locking-type synchronization. We have calculated the statistical distribution of the transient response time of synchronization when the initial position in the starting attractor is varied. For complete synchronization, the distribution of the transient response time has much larger average and variance than the average period of the chaotic oscillations. Conversely, a short transient response time is obtained for strong injection locking-type synchronization. We found that the transient response time is dependent upon the maximum Lyapunov exponent of the chaotic temporal waveform for complete synchronization, whereas it is almost constant for strong injection locking-type synchronization.
Collapse
Affiliation(s)
- A Uchida
- Department of Electronics and Computer Systems, Takushoku University, 815-1 Tatemachi, Hachioji, Tokyo 193-0985, Japan
| | | | | | | |
Collapse
|
97
|
Asano N, Yamakazi T, Seto M, Matsumine A, Yoshikawa H, Uchida A. The expression and prognostic significance of bone morphogenetic protein-2 in patients with malignant fibrous histiocytoma. ACTA ACUST UNITED AC 2004. [DOI: 10.1302/0301-620x.86b4.14484] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We investigated the rates of expression of bone morphogenetic protein-2 (BMP-2) in 29 adult patients with high-grade malignant fibrous histiocytoma of soft tissue, using the BMP-2-specific monoclonal antibody, AbH3b2/17, and found that they ranged from 1.9% to 78.9%. The survival at five years of the groups expressing high (≥30%) and low (< 30%) levels of BMP-2 was 85.7% and 36.3%, respectively. Multivariable analysis showed that only BMP-2 had prognostic significance for continuous disease-free survival and for overall survival (p < 0.05). Our findings indicate that over-expression of BMP-2 in malignant fibrous histiocytoma of soft tissue is the most reliable prognostic indicator of the parameters assessed.
Collapse
Affiliation(s)
- N. Asano
- Department of Orthopaedic Surgery, Mie University Medical School, Edobashi 2-174, Tsu-City, Mie Prefecture 415-8507, Japan
| | - T. Yamakazi
- Department of Orthopaedic Surgery, Mie University Medical School, Edobashi 2-174, Tsu-City, Mie Prefecture 415-8507, Japan
| | - M. Seto
- Department of Orthopaedic Surgery, Mie University Medical School, Edobashi 2-174, Tsu-City, Mie Prefecture 415-8507, Japan
| | - A. Matsumine
- Department of Orthopaedic Surgery, Mie University Medical School, Edobashi 2-174, Tsu-City, Mie Prefecture 415-8507, Japan
| | - H. Yoshikawa
- Department of Orthopaedic Surgery, Osaka University Medical School, Osaka-City, Osaka Prefecture, Japan
| | - A. Uchida
- Department of Orthopaedic Surgery, Mie University Medical School, Edobashi 2-174, Tsu-City, Mie Prefecture 415-8507, Japan
| |
Collapse
|
98
|
Asano N, Yamakazi T, Seto M, Matsumine A, Yoshikawa H, Uchida A. The expression and prognostic significance of bone morphogenetic protein-2 in patients with malignant fibrous histiocytoma. J Bone Joint Surg Br 2004; 86:607-12. [PMID: 15174563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
We investigated the rates of expression of bone morphogenetic protein-2 (BMP-2) in 29 adult patients with high-grade malignant fibrous histiocytoma of soft tissue, using the BMP-2-specific monoclonal antibody, AbH3b2/17, and found that they ranged from 1.9% to 78.9%. The survival at five years of the groups expressing high (> or = 30%) and low (< 30%) levels of BMP-2 was 85.7% and 36.3%, respectively. Multivariable analysis showed that only BMP-2 had prognostic significance for continuous disease-free survival and for overall survival (p < 0.05). Our findings indicate that over-expression of BMP-2 in malignant fibrous histiocytoma of soft tissue is the most reliable prognostic indicator of the parameters assessed.
Collapse
Affiliation(s)
- N Asano
- Department of Orthopaedic Surgery, Mie University Medical School, Faculty of Medicine, Tsu-City, Mie Prefecture, Japan
| | | | | | | | | | | |
Collapse
|
99
|
Nagai T, Torishima R, Nakashima H, Ookawara H, Uchida A, Kai S, Sato R, Murakami K, Fujioka T. Saline-assisted endoscopic resection of rectal carcinoids: cap aspiration method versus simple snare resection. Endoscopy 2004; 36:202-5. [PMID: 14986216 DOI: 10.1055/s-2004-814248] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND STUDY AIMS Complete resection of small carcinoid tumors of the rectum is difficult during endoscopic polypectomy, because these tumors are often located in the submucosal layer of the rectal wall. To completely remove these tumors, we have used aspiration lumpectomy. In this study, we evaluated its clinical usefulness in comparison with strip biopsy. PATIENTS AND METHODS We performed strip biopsy (December 1996 through March 2000) or aspiration lumpectomy (April 2000 through February 2003) in a consecutive series of patients with rectal carcinoid tumor. Eight carcinoid tumors in eight patients were resected by strip biopsy, and eight tumors in eight patients were resected by aspiration lumpectomy. RESULTS The rate of complete removal of carcinoid tumors with aspiration lumpectomy (100 %) was significantly higher (P < 0.05) than that with strip biopsy (37.5 %). CONCLUSIONS Endoscopic resection with aspiration lumpectomy is a useful and safe method for resection of small carcinoid tumors of the rectum.
Collapse
Affiliation(s)
- T Nagai
- Department of Gastroenterology, Tsurumi Hospital, Beppu, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
100
|
Hirata H, Hibasami H, Yoshida T, Morita A, Ohkaya S, Matsumoto M, Sasaki H, Uchida A. Differentiation and apoptosis without DNA fragmentation in cultured Schwann cells derived from wallerian-degenerated nerve. Apoptosis 2004; 3:353-60. [PMID: 14646482 DOI: 10.1023/a:1009633205444] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The Schwann cell cables provide particularly favorable sites for the growth of regenerating axonal sprouts. However, if they remain denervated, endoneurial fibrosis takes place with the Schwann cells atrophying and total Schwann cell number gradually decrease with time. Even when regenerating axonal sprouts invade into the cables, Schwann cells do not survive for long periods if they fail to make axonal contact. These observations strongly suggest the involvement of apoptosis in peripheral nerve degeneration and regeneration. So, we investigated the behavior of Schwann cells prepared from wallerian-degenerated adult rat sciatic nerve in vitro. The secondary cultured Schwann cells showed serial changes in morphology, mitotic activity and migratory activity as they do during Schwann cell cable formation in vivo. At the final stage of differentiation, the Schwann cells became rounded and detached from the flask with extensive blebbing. Electron micrographs clearly demonstrated typical cytoplasmic changes of apoptosis, but, nuclei of most of the cells retained their size and morphology with residual nucleolar structures. An agarose gel electrophoresis of DNA clearly demonstrated that there was not any DNA fragmentation up to 120 h after detachment. Results by in situ apoptosis detection assay did not show any DNA degradation despite the substantial decrease in Schwann cell number. In conclusion, during peripheral nerve degeneration and regeneration, supernumerary Schwann cells are removed by apoptosis, however, it lacks most of the nuclear events of usual apoptosis.
Collapse
Affiliation(s)
- H Hirata
- Department of Orthopedic Surgery, Faculty of Medicine, Mie University, Tsu-city, Mie 514-8507, Japan.
| | | | | | | | | | | | | | | |
Collapse
|