The Tohoku Journal of Experimental Medicine
Online ISSN : 1349-3329
Print ISSN : 0040-8727
ISSN-L : 0040-8727
Volume 237 , Issue 1
September
Showing 1-11 articles out of 11 articles from the selected issue
Regular Contribution
  • Kazuo Koyanagi, Hiroyasu Igaki, Jun Iwabu, Hiroki Ochiai, Yuji Tachimo ...
    Type: Regular Contribution
    2015 Volume 237 Issue 1 Pages 1-8
    Published: 2015
    Released: August 11, 2015
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    Recurrent laryngeal nerve paralysis (RLNP) after esophagectomy is a common complication and associated with aspiration pneumonia. In this study, we assessed the risk of RLNP and the usefulness of immediate reconstruction of recurrent laryngeal nerve (RLN) to prevent respiratory complications after esophagectomy. Seven hundred and eighty-two consecutive patients underwent an esophagectomy with three-field lymph node dissection, simultaneous gastric conduit reconstruction, and cervical anastomosis. Vocal cord function was observed using a flexible laryngoscope. Reconstruction between RLN and ipsilateral vagus nerve was performed during esophagectomy. RLNP was observed in 229 (29.3%) of the patients after esophagectomy: 198 unilateral and 31 bilateral cases. Of the 198 unilateral RLNP, vocal cord paralysis was observed predominantly on the left side (82.7%). RLNP was significantly associated with postoperative respiratory complications (P < 0.001) requiring a tracheotomy (P < 0.001) and mechanical ventilation (P < 0.001) and was also associated with esophagogastric anastomotic leakage (P = 0.015); consequently, the postoperative hospital stay was longer for patients with RLNP (P < 0.001). A longer operation time (P < 0.001) and advanced age (P = 0.038) were identified as significant independent predictors of RLNP. Resection of the RLN together with metastatic nodes was performed in 29 cases. The patients underwent RLN reconstruction (n = 11) had a significantly shorter postoperative hospital stay than those without RLN reconstruction (n = 18) (P = 0.019). In conclusion, RLNP was related to a poorer postoperative course among patients undergoing an esophagectomy. New surgical technologies are recommended for prevention of RLNP.
Review
  • Ryu Watanabe, Tomonori Ishii, Hideo Harigae
    Type: Review
    2015 Volume 237 Issue 1 Pages 9-15
    Published: 2015
    Released: August 18, 2015
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    Hepatitis B virus (HBV) infection is one of the most common diseases, and approximately two billion people are infected with HBV in the world. Until recently, hepatitis B surface antigen (HBsAg)-negative patients, carrying hepatitis B surface antibody (anti-HBs) and/or hepatitis B core antibody (anti-HBc), have been considered to have achieved the resolution of HBV infection; however, among those patients, the reactivation of HBV has been increasingly reported after chemotherapy, hematopoietic stem cell transplantation, or immunosuppressive therapy. The reactivation of HBV can cause lethal hepatitis called de novo hepatitis B. Therefore, serological examination for HBV infection before starting immunosuppressive therapy is now recommended for all patients with rheumatic diseases. Systemic lupus erythematosus (SLE) is one of the autoimmune diseases characterized by the production of autoantibodies and usually requires immunosuppressive therapy. However, to date, a few reports are available regarding the prevalence and time course of HBV infection in patients with SLE under immunosuppressive therapy. In this review, we update the prevalence and time course of HBV infection in lupus patients using our data and previous papers available, with a special emphasis on occult HBV infection and a decrease of HBV-related antibodies (anti-HBs and anti-HBc) under immunosuppressive therapy. This review also highlights the screening and management of HBV infection currently recommended and the potential role of HBV infection in the pathogenesis of SLE. Throughout the present review, we recommend the pretreatment screening for HBV infection in patients with SLE as well as patients with other rheumatic diseases.
Regular Contribution
  • Nursen Keles, Mustafa Caliskan, Burcu Dogan, Necibe Nur Keles, Macit K ...
    Type: Regular Contribution
    2015 Volume 237 Issue 1 Pages 17-23
    Published: 2015
    Released: August 20, 2015
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    The Klotho gene, identified as an ‘aging suppressor’ gene, encodes a single-pass transmembrane protein. The extracellular domain of Klotho is cleaved and released in the blood stream, where it may function as a vasculoprotective hormone. Carotid artery intima-media thickness (CIMT), flow-mediated dilation (FMD) of the brachial artery and epicardial fat thickness (EFT) have been reported as early predictors of atherosclerosis. We aimed to investigate the relationship between serum Klotho levels and early atherosclerotic predictors, including EFT, FMD and CIMT in healthy adults. Fifty healthy volunteers were enrolled in this study, consisting of 21 males and 29 females with median age of 32 years. They were free of known risk factors for cardiovascular diseases. Serum Klotho levels were determined by the ELISA method. The study population was divided into two groups (n = 25 for each) according to the median serum Klotho level (459.4 pg/mL): higher Klotho (HK) group (613.6 pg/mL; ranges of 501.2-772.6 pg/mL) and lower Klotho (LK) group (338.7 pg/mL; ranges of 278.8-430.3 pg/mL). EFT was measured by transthoracic echocardiography, and CIMT and FMD were measured with standard procedures. The LK group showed lower values of FMD (p = 0.012) and larger values of EFT (p = 0.01) and CIMT (p < 0.001), compared to the HK group. Thus, the low serum Klotho levels were associated with increased EFT and CIMT and with the decreased FMD in the study population. We propose that the lower serum Klotho level is a newly identified predictor of atherosclerosis.
  • Masahiko Kito, Satoru Motoyama, Kazuma Fujita, Masatomo Miura, Hiroshi ...
    Type: Regular Contribution
    2015 Volume 237 Issue 1 Pages 25-30
    Published: 2015
    Released: August 27, 2015
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    Endometrial cancer (EC) rates are rising in Japan. Lymph node (LN) metastasis is an important prognostic factor in EC, and its risk is increased with higher tumor grade, deep myometrial invasion, larger tumor size, and lymphovascular space invasion (LVSI). Current methodologies to assess these factors are unreliable. We previously showed the association between C-reactive protein (CRP) 1846C>T (rs1205) polymorphism and LN metastasis in esophageal, non-small cell lung, and breast cancers. The CRP gene is located on chromosome 1q21-q23, and the polymorphism in the noncoding region (1846C>T) of this gene decreases serum CRP levels. We investigated the relationship between CRP 1846C>T genetic polymorphism and LN metastasis or LVSI in 130 EC patients using polymerase chain reaction-restriction fragment length polymorphism. The CRP 1846C/T genotype was C/C in 11 patients, C/T in 58 patients and T/T in 61 patients. The patients were divided into two groups based on their CRP 1846 genotypes: “C/C” and “C/T + T/T”. Nine (7%) and 18 (13%) patients, all with the polymorphism, had LN metastasis and moderate or prominent lymphatic invasion, respectively. LN metastasis and/or severe lymphatic invasion were observed in the C/T + T/T group, while patients with the C/C genotype had no LN metastases or severe lymphatic invasion. Univariate and multivariate logistic regression models revealed that the C/T + T/T patients had a significant likelihood of developing LN metastasis and/or severe lymphatic invasion. Our results suggest that CRP genetic polymorphism is a novel risk predictor of LN metastasis and/or lymphatic invasion in EC.
  • Takuichi Sato, Junko Tomida, Takashi Naka, Nagatoshi Fujiwara, Ayako H ...
    Type: Regular Contribution
    2015 Volume 237 Issue 1 Pages 31-37
    Published: 2015
    Released: August 29, 2015
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    Porphyromonas strains, including Porphyromonas-like strains, have been isolated from oral and various other systemic infections. The characterization of such strains is a crucial issue, because such information contributes to both the taxonomy of anaerobic bacteria and the clinical aspects of infectious diseases. We previously isolated four Porphyromonas-like strains from intraoperative bronchial fluids of a patient with non-small cell lung cancer. This study aimed to characterize the genetic, biochemical and chemotaxonomic aspects of these isolates. Each strain only grew under anaerobic conditions and their colony morphology was convex, 0.1-1.0 mm in diameter, light gray, and slightly glistening colony, with no black or brown pigmentation on blood agar plates after five-day incubation. The pigmentation was helpful to differentiate the isolates from other Porphyromonas, as most of Porphyromonas species show the pigmentation. In the 16S rRNA gene phylogenetic analysis (98% sequence identity of isolates indicates the same species), the four isolates were closely related to one another (99.7-100.0%), but not related to Porphyromonas (P.) catoniae, the closest species (96.9%). In addition, the DNA-DNA hybridization data revealed less than 16% similarity values between a representative isolate and the P. catoniae, indicating that the strains were genetically independent. Biochemically, the isolates could be differentiated from closely related species, i.e., P. catoniae, P. gingivalis, P. gulae, and P. pogonae, with trypsin activity (negative only in the isolates) and leucine arylamidase activity (positive only in the isolates). We therefore propose a new species to include these isolates: Porphyromonas bronchialis sp. nov.
Letter to the Editor
Commentary
  • Hisanori Fukunaga, Hiromi Kumakawa
    Type: Commentary
    2015 Volume 237 Issue 1 Pages 41-43
    Published: 2015
    Released: September 01, 2015
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    The great earthquake of 11 March 2011 and resulting tsunami caused serious damage to various areas of the Pacific coast in northeast Fukushima, and all the residents faced fears of meltdown of the reactors at the Fukushima Daiichi Nuclear Power Plant. One of the most seriously affected areas was the district of Soso, located in the northeast part of Fukushima prefecture, with 12 municipalities (Soma City, Minamisoma City, Shinchi Town, Namie Town, Futaba Town, Ōkuma Town, Tomioka Town, Naraha Town, Hirono Town, Iitate Village, Katsurao Village and Kawauchi Village). The district of Soso is home to approximately 200,000 residents, many of whom were seriously affected by the threefold disaster. During the subsequent four years, the population of Soso decreased by nearly 10%. In March 2011 before the disaster, five hospitals and two clinics for psychiatric patients, along with 712 inpatients, were operating in the district of Soso. However, as of March 2015, there were only one hospital and three clinics, along with approximately 50 inpatients, although a new mental health clinic in Soma City was opened in 2012 for supporting victims suffering from the disaster. We hereby suggest that the patients and residents of northeast Fukushima may be undergoing mental health crisis. In fact, disaster-related psychological stress could have induced several physical and mental disorders. The mid- and long-term supports are urgently needed not only for psychiatric patients but also for all residents in the district of Soso.
Medical Hypothesis
  • Hidekazu Nishimura, Mutsuo Yamaya
    Type: Medical Hypothesis
    2015 Volume 237 Issue 1 Pages 45-50
    Published: 2015
    Released: September 03, 2015
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    Ebola virus disease (EVD) has been a great concern worldwide because of its high mortality. EVD usually manifests with fever, diarrhea and vomiting, as well as disseminated intravascular coagulation (DIC). To date, there is neither a licensed Ebola vaccine nor a promising therapeutic agent, although clinical trials are ongoing. For replication inside the cell, Ebola virus (EBOV) must undergo the proteolytic processing of its surface glycoprotein in the endosome by proteases including cathepsin B (CatB), followed by the fusion of the viral membrane and host endosome. Thus, the proteases have been considered as potential targets for drugs against EVD. However, no protease inhibitor has been presented as effective clinical drug against it. A synthetic serine protease inhibitor, nafamostat mesilate (NM), reduced the release of CatB from the rat pancreas. Furthermore, it has anticoagulant activities, such as inhibition of the factor VIIa complex, and has been used for treating DIC in Japan. Thus, NM could be considered as a drug candidate for the treatment of DIC induced by EBOV infection, as well as for the possible CatB-related antiviral action. Moreover, the drug has a history of large-scale production and clinical use, and the issues of safety and logistics might have been cleared. We advocate in vitro and in vivo experiments using active EBOV to examine the activities of NM against the infection and the DIC induced by the infection. In addition, we suggest trials for comparison among anti-DIC drugs including the NM in EVD patients, in parallel with the experiments.
Regular Contribution
  • Haneul Lee, Jerrold S. Petrofsky, JongEun Yim
    Type: Regular Contribution
    2015 Volume 237 Issue 1 Pages 51-56
    Published: 2015
    Released: September 03, 2015
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    Hormones such as estradiol have an effect on human connective tissue, making women more susceptible to knee injuries. Indeed, women have a greater risk for non-contact injuries of anterior cruciate ligament (ACL) compared to men when participating in the same sports. The purpose of the present study was to examine the difference in ACL laxity after an eccentric exercise in the lower limbs in young healthy women between oral contraceptive pill (OCP) users and non-OCP users to see the effect of OCP on ACL laxity. Forty young healthy women participated in the experiments (25 with normal menstrual cycle and 15 with taking OCP). ACL laxity and a visual analog pain scale were measured before and after a bout of squat. OCP users had more pain than non-OCP users after heavy exercise (p < 0.001). Both groups showed a significant reduction in ACL laxity on the 2nd day after exercise (p < 0.05). While ACL laxity was always less in the OCP group, when expressed as a percent change from baseline, the ACL laxity change was similar in both groups (p > 0.05). We found that there was no statistically significant difference in ACL laxity recovery over time in response to the delayed onset muscle soreness after a bout of squat between two groups. However, health professionals working with young female adults should recognize that OCP users with less ACL laxity are at higher risk for having knee injuries because of ACL stiffness when doing exercise.
  • Lin Wu, Xiao-Tao Feng, Yue-Qiang Hu, Nong Tang, Qing-Shan Zhao, Tian-W ...
    Type: Regular Contribution
    2015 Volume 237 Issue 1 Pages 57-67
    Published: 2015
    Released: September 10, 2015
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    Vascular dementia (VD) has been one of the most serious public health problems worldwide. It is well known that cerebral hypoperfusion is the key pathophysiological basis of VD, but it remains unclear how global genes in hippocampus respond to cerebral ischemia-reperfusion. In this study, we aimed to reveal the global gene expression profile in the hippocampus of VD using a rat model. VD was induced by repeated occlusion of common carotid arteries followed by reperfusion. The rats with VD were characterized by deficit of memory and cognitive function and by the histopathological changes in the hippocampus, such as a reduction in the number and the size of neurons accompanied by an increase in intercellular space. Microarray analysis of global genes displayed up-regulation of 7 probesets with genes with fold change more than 1.5 (P < 0.05) and down-regulation of 13 probesets with genes with fold change less than 0.667 (P < 0.05) in the hippocampus. Gene Ontology (GO) and pathway analysis showed that the up-regulated genes are mainly involved in oxygen binding and transport, autoimmune response and inflammation, and that the down-regulated genes are related to glucose metabolism, autoimmune response and inflammation, and other biological process, related to memory and cognitive function. Thus, the abnormally expressed genes are closely related to oxygen transport, glucose metabolism, and autoimmune response. The current findings display global gene expression profile of the hippocampus in a rat model of VD, providing new insights into the molecular pathogenesis of VD.
  • Sayuri Fukuda, Yurika Tanaka, Kiyomi Harada, Ayako Saruwatari, Kaori K ...
    Type: Regular Contribution
    2015 Volume 237 Issue 1 Pages 69-75
    Published: 2015
    Released: September 11, 2015
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    Recently, in Japan, the percentage of leanness has risen in young women, and the average birth weight has decreased. An increase in the risk of low birth weight has been reported in lean expectant mothers. In this study, we aimed to clarify the relationship between mother’s physique at the beginning of pregnancy and the infant’s physique, by focusing on sex differences. The participants were 3,722 mothers who attended health checkups for 18-month-old infants in an urban Japanese city. The participants were limited to those with full-term births, thereby excluding the influence of gestational length. A total of 1,287 mothers, with 621 boys and 666 girls, were analyzed. Public health professionals interviewed the mothers, and transferred the required information from their maternity passbooks. We examined the physical characteristics of the mothers and their infants. Partial correlation analysis, adjusted by gestational length and the mother’s age at delivery, was applied to study the association between the mother’s BMI and the infant’s physique at birth. In the primipara group, only the boys showed significant positive correlation between the mother’s BMI and the birth weight (P = 0.025) and the Kaup index (P = 0.035). In the pluripara group, only the boys showed significant positive correlation between the mother’s BMI and the head circumference (P = 0.035). Thus, mother’s physique may have a stronger influence on the physique of male infants, compared to female infants. The growth-promoting effect of the mother’s physique is more apparent in the infants born to the pluripara.
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