Abe T.,Tohoku University |
Sugimura K.,Mie University |
Hosono Y.,Tohoku University |
Takami Y.,Miyazaki Medical College |
And 12 more authors.
Journal of Biological Chemistry | Year: 2011
Ordered nucleosome disassembly and reassembly are required for eukaryotic DNA replication. The facilitates chromatin transcription (FACT) complex, a histone chaperone comprising Spt16 and SSRP1, is involved in DNA replication as well as transcription. FACT associates with the MCM helicase, which is involved in DNA replication initiation and elongation. Although the FACT-MCM complex is reported to regulate DNA replication initiation, its functional role in DNA replication elongation remains elusive. To elucidate the functional role of FACT in replication fork progression during DNA elongation in the cells, we generated and analyzed conditional SSRP1 gene knock-out chicken (Gallus gallus) DT40 cells. SSRP1-depleted cells ceased to grow and exhibited a delay in S-phase cell cycle progression, although SSRP1 depletion did not affect the level of chromatin-bound DNA polymerase α or nucleosome reassembly on daughter strands. The tracking length of newly synthesized DNA, but not origin firing, was reduced in SSRP1-depleted cells, suggesting that the S-phase cell cycle delay is mainly due to the inhibition of replication fork progression rather than to defects in the initiation of DNA replication in these cells. We discuss the mechanisms of how FACT promotes replication fork progression in the cells. © 2011 by The American Society for Biochemistry and Molecular Biology, Inc.
Taura N.,Clinical Research Center |
Fukushima N.,Kurume University |
Yatsuhashi H.,Clinical Research Center |
Takami Y.,National Hospital Organization Kyushu Medical Center |
And 16 more authors.
Medical Science Monitor | Year: 2011
Background: The incidence of hepatocellular carcinoma (HCC) in Japan has still been increasing. The aim of the present study was to analyze the epidemiological trend of HCC in the western area of Japan, Kyushu. Material/Methods: A total of 10,010 patients with HCC diagnosed between 1996 and 2008 in the Liver Cancer study group of Kyushu (LCSK), were recruited for this study. Cohorts of patients with HCC were categorized into five year intervals. The etiology of HCC was categorized to four groups as follows; B: HBsAg positive, HCVRNA negative, C: HCV-RNA positive, HBsAg negative, B+C: both of HBsAg and HCV-RNA positive, non- BC: both of HBsAg and HCV-RNA negative. Results: B was 14.8% (1,485 of 10,010), whereas 68.1% (6,819 of 10,010) had C, and 1.4% (140 of 10,010) had HCC associated with both viruses. The remaining 1,566 patients (15.6%) did not associate with both viruses. Cohorts of patients with HCC were divided into six-year intervals (1996-2001 and 2002-2007). The ratio of C cases decreased from 73.1% in 1996-2001 to 64.9% in 2002-2007. On the other hand, B and -nonBC cases increased significantly from 13.9% and 11.3% in 1996-2001 to 16.2% and 17.6% in 2002-2007, respectively. Conclusions: The incidence of hepatocellular carcinoma associated with hepatitis C infection decreased after 2001 in Kyushu area. This change was due to the increase in the number and proportion of the HCC not only nonBC patients but also B patients. © Med Sci Monit.
Hashimoto H.,Kyoto University |
Hashimoto H.,Emory University |
Takami Y.,Miyazaki Medical College |
Sonoda E.,Kyoto University |
And 8 more authors.
Nucleic Acids Research | Year: 2010
In eukaryotic nuclei, DNA is wrapped around an octamer of core histones to form nucleosomes, and chromatin fibers are thought to be stabilized by linker histones of the H1 type. Higher eukaryotes express multiple variants of histone H1; chickens possess six H1 variants. Here, we generated and analyzed the phenotype of a complete deletion of histone H1 genes in chicken cells. The H1-null cells showed decreased global nucleosome spacing, expanded nuclear volumes, and increased chromosome aberration rates, although proper mitotic chromatin structure appeared to be maintained. Expression array analysis revealed that the transcription of multiple genes was affected and was mostly downregulated in histone H1-deficient cells. This report describes the first histone H1 complete knockout cells in vertebrates and suggests that linker histone H1, while not required for mitotic chromatin condensation, plays important roles in nucleosome spacing and interphase chromatin compaction and acts as a global transcription regulator. © The Author(s) 2010. Published by Oxford University Press.
Maki Y.,University of Miyazaki |
Furukawa S.,University of Miyazaki |
Furukawa S.,Miyazaki Medical College |
Sameshima H.,University of Miyazaki |
Ikenoue T.,University of Miyazaki
Journal of Obstetrics and Gynaecology Research | Year: 2014
The mechanism of synchronizing uterine contractions is not fully understood. We present a case of twin pregnancy in a uterus didelphys and objectively analyze the synchrony of bilateral uterine contractions. A 32-year-old woman, with a history of vaginal septal resection during her previous vaginal delivery, became pregnant with twins in a uterus didelphys in which each uterine horn had one fetus. At 37 weeks and 6 days, the first baby was delivered vaginally. The second baby was delivered by cesarean section due to recurrent late decelerations. Operative findings confirmed the didelphys uterus. We retrospectively reviewed the timing of contractions of both uteruses. The timing was determined by visual analysis as synchronous if both uteruses contracted within 5 s. Otherwise, contractions were considered solitary. Both uterine horns contracted independently in 90% of the incidence throughout labor and delivery. From this rare case of an 'experiment by nature', we speculated that the myometrium must be histologically connected in order to synchronize uterine contractions. © 2013 Japan Society of Obstetrics and Gynecology.
Nakamura T.,University of Miyazaki |
Toyama K.,National Hospital Organization Miyakonojo National Hospital |
Sato S.,Miyazaki Prefectural Nobeoka Hospital |
Kodama T.,Miyazaki Prefectural Nobeoka Hospital |
Tono T.,Miyazaki Medical College
Journal of Otolaryngology of Japan | Year: 2014
Mycotic pseudoaneurysm is a rare complication of deep neck infection. We report herein on a case of mycotic pseudoaneurysm of the external carotid artery following myelodysplastic syndrome and a peritonsillar abscess. The patient was a male in his 60s, who complained of a sore throat and swelling of the left side of his neck. CT scan of the neck showed a left peritonsillar abscess and a pseudoaneurysm of the left external carotid artery. To correspond to airway obstruction in the event that the pseudoaneurysm might rupture to the pharyngeal space, the patient was transferred to our hospital. Surgical management was not selected, since MRI taken just after the admission to our hospital demonstrated remission of the pseudoaneurysm by organization of the structure and decrease of the blood flow. An antibacterial drug and an antifungal drug, SBTPC and VRCZ, were administered to the patient, the inflammatory signs reduced and the size of the pseudoaneurysm gradually diminished without sequela. These findings strongly suggest the importance of controlling the initial neck infection by administration of appropriate antibacterial and/or antifungal drugs to avoid the expansion of the mycotic pseudoaneurysm. Furthermore, MRI was useful to assess the state of the lesion and to determine the way of management.
Kashima K.,Miyazaki Medical College |
Takamori K.,Miyazaki Medical College |
Igawa K.,Miyazaki Medical College |
Yoshioka I.,Miyazaki Medical College |
Sakoda S.,Miyazaki Medical College
Oral Science International | Year: 2012
Oral tonsils, ectopic sublingual tonsillar tissue, manifest as an asymptomatic, nonulcerated, freely movable nodule. We present a case of a 28-year-old female with ectopic tonsillar tissue in the anterior floor of the mouth. The lesion was totally removed under local anesthesia. The microscopic examination showed well demarcated and encapsulated lymphoid tissue with lymphoid follicles and central lacuna-like squamous epithelium covering space. These findings are similar to tonsillar tissue, and the case was finally diagnosed as sublingual oral tonsil. This article underlines that oral tonsils occur more frequently than is generally recognized, and the importance of differential diagnosis of soft tissue nodules in the oral floor. © 2012 Japanese Stomatological Society.
Phin S.,French Institute of Health and Medical Research |
Marchand-Adam S.,French Institute of Health and Medical Research |
Marchand-Adam S.,University Paris Diderot |
Fabre A.,French Institute of Health and Medical Research |
And 7 more authors.
American Journal of Respiratory Cell and Molecular Biology | Year: 2010
Hepatocyte growth factor (HGF) is a growth factor for alveolar epithelial cells. Activation of pro-HGF to HGF is regulated by the HGF activator (HGFA), a serine protease, and a specific inhibitor (HGFA inhibitor-1, HAI-1). An imbalance in the HGFA/HAI-1 system might contribute to lung fibrosis. Pro-HGF activation capacity from bronchoalveolar lavage (BAL) fluid was evaluated 3, 7, and 14 days after the intratracheal bleomycin injection (Bleo) in mice with or without thrombin. BAL fluid from naïve mice was used as control. HGFA and HAI-1 mRNA were evaluated by QPCR in the whole lung or by Western blot in BAL fluid. BAL fluid from control mice and Bleo mice activated pro-HGF in vitro at a similar degree. Thrombin accelerated proHGF activationby Bleo BAL on Day 3 and Day 7, but not on Day 14, or in control BAL. Incubation of pro-HGF with BAL from Bleo Day 3 and Day 7 mice increased phosphorylation of HGFR on A549 cells. Thrombin-induced pro-HGF activation was inhibited by an anti-HGFA antibody and accelerated by an anti-HAI-1 antibody. Active HGFA was not detected in control BAL and was strongly induced in Bleo BAL. HGFA concentrations were higher on Day 3 and Day 7 than on Day 14. HAI-1 was detected at low levels in control BAL and increased strongly by Day 3 with stable concentrations until Day 14. By demonstrating an imbalance between HGFA and HAI-1 expression in BAL fluid, our results highlight a defective thrombin-dependent proHGF activation system at the fibrotic phase of bleomycin-induced pulmonary fibrosis.
PubMed | Miyazaki Medical College
Type: Journal Article | Journal: Modern rheumatology | Year: 2014
Abstract A 36-year-old male patient with dermatomyo-sitis (DM) associated with rapidly progressive interstitial pneumonia (IP) was successfully treated by high-dose intravenous immunoglobulin (IVIG). He suffered from myopathy, skin lesions, and IP. In spite of the treatment with a high-dose corticosteroid, IP progressed rapidly. Then high-dose intravenous immunoglobulin (20 g/day, 4 days) was administered. The skin lesions, myopathy, and pulmonary lesions improved. High-dose IVIG was considered to be a relatively safe and effective treatment for progressive IP associated with DM.
PubMed | Miyazaki Medical College
Type: Journal Article | Journal: Environmental health and preventive medicine | Year: 2011
To elucidate the association between genetic polymorphisms ofCYP2a6 andCYP2E1 and urothelial cancer susceptibility.A total of 137 Japanese patients with urothelial cancer and 217 Japanese healthy controls, frequency-matched for age and gender, were selected. The polymorphisms ofCYP2A6 andCYP2E1 were analyzed by PCR-RFLP, and cigarette smoking histories were obtained through interviewsThe frequency ofCYP2A6 homozygote deletion genotype was 2.9% in the patients, compared with 3.2% in the controls (OR=0.84, 95% CI 0.24-2.96). The frequencies ofCYP2E1 C1/c2 andC2/c2 were 27.7% and 4.4% in the patients, compared with 35.5% and 6.0% in the controls (OR=0.68, 95% CI 0.42-1.09, OR=0.67, 95% CI 0.24-1.84, respectively). No statistically significant differences were observed when theCYP2A6 homozygote deletion genotype and theCYP2E1 genotypes were examined relative to smoking status.Our data indicate that neither a relationship between genetically impaired nitrosamine metabolism and tobacco-smoking consumption, nor urothelial cancer risk related to theCYP2A6 deletion genotype andCYP2E1 Rsa I genotype was found in Japanese population.
PubMed | Miyazaki Medical College
Type: | Journal: Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences | Year: 2010
We first investigated the time course of CBF thresholds of ischemic cortices by a retrospective review of 19 patients with MCA occlusion who had clearly defined ischemic duration from onset to angiographic complete recanalization. Secondly, CBF thresholds of ischemic cortices salvageable with intravenous low dose native t- PA infusion therapy (7.2 mg of tisokinase) were examined by a retrospective review of 20 patients with distal embolic occlusions of MCA divisions or branches. All patients underwent pretreatment CBF measurement by SPECT using 99mTc-ECD. Pretreatment SPECT and 3 months post-treatment CT images were compared using computerized coregistration. The degree of hypoperfusion was analyzed by an asymmetry index (AI), which was a count-density ratio for the ischemic lesion to the contralateral corresponding area. Ischemic cortices on SPECT were divided into reversible and irreversible lesions. Judging from the regression lines with 95% confidence interval between the ischemic duration and AI, the infarcted CBF thresholds at 3 and 6 hours after onset may be about 30 and 50% of contralateral presumed normal CBF, respectively. On the other hand, to save the ischemic tissue with our intravenous t-PA infusion therapy, residual CBF might be needed at least 45% of contralateral presumed normal CBF. It is likely that CBF threshold of ischemia surely salvageable with our intravenous t-PA infusion therapy may be approximately 50-55% of contralateral presumed normal CBF.