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Sakie Funato, Rika Yasuhara, Kentaro Yoshimura, Yoichi Miyamoto, Kotaro Kaneko, Tetsuo Suzawa, Daichi Chikazu, Kenji Mishima, Kazuyoshi Baba, Ryutaro Kamijo
Osteoarthritis is a degenerative joint disease caused by excessive death of chondrocytes and loss of the extracellular matrix (ECM) in articular cartilage. We previously reported that reactive oxygen species (ROS) generated by the NADPH oxidase (NOX) isoform NOX-2 are involved in chondrocyte death induced by interleukin-1β (IL-1β). In this study, we investigate the role of NOX-2 in the production and degradation of ECM by chondrocytes. Although IL-1β lowered the mRNA expression of type II collagen (Col2a1) and aggrecan (Acan) in mouse chondrocyte-like ATDC5 cells, RNA silencing of Nox2 did not change the mRNA expression of these major components of the ECM of cartilage...
January 9, 2017: Cell and Tissue Research
Daisuke Ichikawa, Atsuko Kamijo-Ikemori, Takeshi Sugaya, Keiichi Ohata, Mikako Hisamichi, Seiko Hoshino, Kenjiro Kimura, Yugo Shibagaki
BACKGROUND: The aim of this study was to elucidate whether urinary tubular markers during the chronic phase of acute kidney injury (AKI) are associated with chronic tubulointerstitial damage. METHODS: Male human L-type fatty acid binding protein (L-FABP) chromosomal transgenic (Tg) mice underwent ischemic reperfusion (I/R) injury via renal pedicle clamping for either 10 min or 20 min. Contralateral nephrectomy was performed at the time of tissue reperfusion...
January 7, 2017: Nephrology
Shin Kamijo, Kaori Kamijo, Kiyotaka Maruoka, Toshihiro Murafuji
The catalytic introduction of an allyl group at nonacidic C(sp(3))-H bonds was achieved under photoirradiation, in which 1,2-bis(phenylsulfonyl)-2-propene acts as an allyl source and 5,7,12,14-pentacenetetrone (PT) works as a C-H bond-cleaving catalyst. A variety of substances, including alkanes, carbamates, ethers, sulfides, and alcohols, were chemoselectively allylated in a single step under neutral conditions. The present transformation is catalyzed solely by an organic molecule, PT, and proceeds smoothly even under visible light irradiation (425 nm) in the case of alkanes as a starting substance...
December 16, 2016: Organic Letters
Fumio Kawaguchi, Akira T Kawaguchi, Chieko Murayama, Akemi Kamijo, Munetaka Haida
Liposome-encapsulated hemoglobin (LEH) with high (h-LEH, P50 O2  = 10 mm Hg) or low O2 affinity (l-LEH, P50 O2  = 40 mm Hg) may improve O2 delivery to sensitize tumor tissues for radiotherapy. A total of 10 mL/kg of h-LEH, l-LEH, red blood cells (RBCs), or saline was infused in mice transplanted with murine colon carcinoma with near-infrared spectroscopy (NIRS) detectors set at the tumor (right leg) and intact muscle (left leg). NIRS recorded changes in the amount of oxyhemoglobin (oxyHb), deoxyhemoglobin (deoxyHb), and their sum (tHb) with the animals spontaneously breathing room air (10 min), pure O2 (5 min), and then back to room air...
November 22, 2016: Artificial Organs
Yu Ogawa, Yoshi-Ichiro Kamijo, Shigeki Ikegawa, Shizue Masuki, Hiroshi Nose
KEY POINTS: Humans are unique in controlling body temperature in a hot environment by a large amount of skin blood flow; however, the decrease in total peripheral resistance due to systemic cutaneous vasodilatation and the reduction of venous return to the heart due to blood pooling in the cutaneous vein threatens blood pressure maintenance in the upright position, and occasionally causes heat syncope. Against this condition, cutaneous vasodilatation is reportedly suppressed to maintain arterial pressure; however, the nerve activity responsible for this phenomenon has not been identified...
November 8, 2016: Journal of Physiology
Katsushi Takebayashi, Yasuhiro Tsubosa, Satoru Matsuda, Keisuke Kawamorita, Masahiro Niihara, Takahiro Tsushima, Tomoya Yokota, Hiroshi Sato, Yusuke Onozawa, Hirofumi Ogawa, Tomoyuki Kamijo, Tetsuro Onitsuka, Masahiro Nakagawa, Hirofumi Yasui
Esophagectomy and definitive chemoradiotherapy are recognized standard initial treatment modalities for cervical esophageal cancer. The goal of this study was to compare the treatment outcomes of curative surgery with those of chemoradiotherapy in patients who had potentially resectable tumor and who were candidates for surgery. We evaluated the data from 49 consecutive patients who were diagnosed with potentially resectable cervical esophageal cancer and who were deemed candidates for surgery. Thirteen patients were included in the surgery group, and 36 patients were included in chemoradiotherapy group...
November 9, 2016: Diseases of the Esophagus: Official Journal of the International Society for Diseases of the Esophagus
Tsutomu Fukui, Yasuhisa Ueda, Fumiko Kamijo
[Purpose] Support moment was defined as the sum of ankle plantar flexion, knee and hip extension moments. There are some mechanical relationships among the 3 joints. If these relationships were understood, it might be possible to determine which joint should be strengthened to improve gait. The aims of this study were to examine the mutual relationship among kinetic variables of the 3 joints during different phases. [Subjects and Methods] Twenty-five healthy subjects volunteered for this study. They were asked to walk on a platform at a self-selected speed...
October 2016: Journal of Physical Therapy Science
Keina Nozaki, Yuka Kamijo, Mineo Nakatsuka, Takeshi Azuma, Tohru Nakagawa, Hideyo Miyazaki, Tetsuya Fujimura, Hiroshi Fukuhara, Haruki Kume, Yoshitaka Ishibashi, Yukio Homma
PURPOSE: To evaluate the effectiveness of computed tomography (CT) for detection of exit-site and tunnel infections with a Tenckhoff catheter. MATERIALS AND METHODS: The study enrolled patients with exit-site or tunnel infections who underwent ultrasonography (US), CT scans, and subsequent catheter removal or partial catheter reimplantation from 2010 to 2014. Control cases on peritoneal dialysis who underwent abdominal CT scans for other reasons were randomly selected...
December 2016: Clinical Nephrology
Minoru Kato, Yi-Ying Huang, Mina Matsuo, Yoko Takashina, Kazuyo Sasaki, Yasushi Horai, Aya Juni, Shin-Ichi Kamijo, Kaoru Saigo, Kumiko Ui-Tei, Hajime Tei
RNA interference (RNAi) is a powerful tool for the study of gene function in mammalian systems, including transgenic mice. Here, we report a gene knockdown system based on the human mir-187 precursor. We introduced small interfering RNA (siRNA) sequences against the mouse melanocortin-4 receptor (mMc4r) to alter the targeting of miR-187. The siRNA-expressing cassette was placed under the control of the cytomegalovirus (CMV) early enhancer/chicken β-actin promoter. In vitro, the construct efficiently knocked down the gene expression of a co-transfected mMc4r-expression vector in cultured mammalian cells...
September 30, 2016: Experimental Animals
Katsushi Takebayashi, Yasuhiro Tsubosa, Tomoyuki Kamijo, Yoshiyuki Iida, Atsushi Imai, Masato Nagaoka, Takashi Kitani, Masahiro Niihara, Eisuke Booka, Ayako Shimada, Masahiro Nakagawa, Tetsuro Onitsuka
BACKGROUND: Total pharyngolaryngectomy and cervical esophagectomy (TPLCE) after chemoradiotherapy remains a challenge because of the high rate of complications and few available data on outcomes and safety. The purpose of this study was to evaluate the clinical significance of salvage TPLCE and to compare treatment outcomes between hypopharyngeal cancer and cervical esophageal cancer. METHODS: Data from 37 consecutive patients who were diagnosed with potentially resectable hypopharyngeal and cervical esophageal cancer after chemoradiotherapy were retrospectively analyzed...
October 6, 2016: Annals of Surgical Oncology
Eisuke Booka, Yasuhiro Tsubosa, Masahiro Niihara, Wataru Takagi, Katsushi Takebayashi, Ayako Shimada, Takashi Kitani, Masato Nagaoka, Atsushi Imai, Tomoyuki Kamijo, Yoshiyuki Iida, Tetsuro Onitsuka, Masahiro Nakagawa, Hiroya Takeuchi, Yuko Kitagawa
BACKGROUND: Pharyngolaryngectomy with total esophagectomy (PLTE) is an effective surgical treatment for synchronous or metachronous hypopharyngeal or laryngeal cancer and thoracic esophageal cancer, although it is more invasive than esophagectomy and total pharyngolaryngectomy. The aim of this study was to identify risk factors for complications after PLTE. METHODS: From November 2002 to December 2014, a total of 8 patients underwent PLTE at the Shizuoka Cancer Center Hospital, Shizuoka, Japan...
2016: Esophagus: Official Journal of the Japan Esophageal Society
Takeshi Shinozaki, Mitsuru Ebihara, Satoru Iwase, Takuhiro Yamaguchi, Hitoshi Hirakawa, Wataru Shimbashi, Tomoyuki Kamijo, Makito Okamoto, Takeshi Beppu, Junichiro Ohori, Kazuto Matsuura, Motoyuki Suzuki, Hiroshi Nishino, Yuichiro Sato, Hiroto Ishiki
BACKGROUND: Little is known about quality of life and functional status of patients with terminally ill head and neck cancers. METHODS: We conducted a multicenter, prospective, observational study to examine quality of life and functional status in terminally ill head and neck cancer patients. RESULTS: Of the 100 patients meeting inclusion criteria, 72 were observed until death. There was no significant difference in the quality of life score between baseline and Week 3...
September 27, 2016: Japanese Journal of Clinical Oncology
Shin Kamijo, Go Takao, Kaori Kamijo, Teruo Tsuno, Katsuya Ishiguro, Toshihiro Murafuji
Photoinduced catalytic Michael-type radical addition was achieved via olefin insertion into a nonacidic C(sp(3))-H bond, utilizing 2-chloroanthraquinone as a C-H bond-cleaving catalyst and 1,1-bis(phenylsulfonyl)ethylene as an olefinic substrate. The present radical protocol allows carbon chain extension stemming from nonacidic C-H bonds, which complements alkylation at acidic C-H bonds under ionic conditions and installs the active methine site that acts as a versatile synthetic handle for further transformations...
October 7, 2016: Organic Letters
Seitaro Suzuki, Yuki Kojima, Atsushi Takayanagi, Koichi Yoshino, Yoichi Ishizuka, Ryouichi Satou, Naoko Takahashi, Masakazu Tazaki, Hideyuki Kamijo, Naoki Sugihara
The purpose of this study based on a cross-sectional internet survey was to investigate the relationship between risk of obstructive sleep apnea (OSA) and self-assessed oral health status. The participants, who comprised individuals registered with an online research company, were required to complete a self-reported questionnaire. Those answering in the affirmative to both of the following two questions were placed in the OSA-risk group, while those answering in the negative were assigned to the control group: 'Have other people noticed pauses in your breathing while you are sleeping?' and 'Do you feel excessively sleepy during the daytime?'...
2016: Bulletin of Tokyo Dental College
Mikako Hisamichi, Atsuko Kamijo-Ikemori, Takeshi Sugaya, Daisuke Ichikawa, Takayuki Natsuki, Seiko Hoshino, Kenjiro Kimura, Yugo Shibagaki
The aim of this study was to investigate the in vivo role of angiotensin II type 1a (AT1a) receptor in renal damage as a result of hypertension by using transgenic mice with AT1a receptor gene disruption. Transgenic mice that express human liver-type fatty acid binding protein (L-FABP) with or without disruption of the AT1a receptor gene (L-FABP(+/-) AT1a(-/-), and L-FABP(+/-) AT1a(+/+), respectively) were used with urinary L-FABP as an indicator of tubulointerstitial damage. Those female mice were administered subcutaneously deoxycorticosterone acetate (DOCA)-salt tablets plus drinking water that contained 1% saline for 28 d after uninephrectomy...
January 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Yang Yang, Yuyao Feng, Xiaowei Zhang, Takero Nakajima, Naoki Tanaka, Eiko Sugiyama, Yuji Kamijo, Toshifumi Aoyama
Very-long-chain acyl-CoA dehydrogenase (VLCAD) catalyzes the first reaction in the mitochondrial fatty acid β-oxidation pathway. VLCAD deficiency is associated with the accumulation of fat in multiple organs and tissues, which results in specific clinical features including cardiomyopathy, cardiomegaly, muscle weakness, and hepatic dysfunction in infants. We speculated that the abnormal fatty acid metabolism in VLCAD-deficient individuals might cause cell necrosis by fatty acid toxicity. The accumulation of fatty acids may activate peroxisome proliferator-activated receptor (PPAR), a master regulator of fatty acid metabolism and a potent nuclear receptor for free fatty acids...
2016: Tohoku Journal of Experimental Medicine
Katsuhiro Hiranuma, Atsushi Yamada, Tamaki Kurosawa, Ryo Aizawa, Dai Suzuki, Yoshiro Saito, Ryo Nagahama, Mikiko Ikehata, Masayuki Tsukasaki, Naoko Morimura, Daichi Chikazu, Koutaro Maki, Tatsuo Shirota, Masamichi Takami, Matsuo Yamamoto, Takehiko Iijima, Ryutaro Kamijo
The extracellular matrix protein nephronectin (Npnt), also called POEM, is considered to play critical roles as an adhesion molecule in development and functions of various tissues, such as the kidneys, liver, and bone. In the present study, we examined the molecular mechanism of Npnt gene expression and found that vitamin D3 (1α,25-dihydroxyvitamin D3,VD 3) strongly enhanced Npnt mRNA expression in MC3T3-E1 cells from a mouse osteoblastic cell line. The VD 3-induced increase in Npnt expression is both time- and dose-dependent and is mediated by the vitamin D receptor (VDR)...
September 2016: FEBS Open Bio
Keita Kamijo, Hiroaki Masaki
A growing number of studies conducted over the past decade have demonstrated that greater aerobic fitness is associated with superior cognitive control in preadolescent children. Several studies have suggested that the relationship between fitness and cognitive control may be attributed to differential reliance on proactive vs. reactive cognitive control modes. However, this contention has remained speculative, and further studies are needed to better elucidate this relationship. We designed the present study to test the hypothesis that use of cognitive control modes would differ as a function of childhood fitness...
2016: Frontiers in Human Neuroscience
Keita Kamijo, Yuji Takeda, Yohei Takai, Miki Haramura
Several studies have indicated that higher levels of childhood aerobic fitness is associated with superior cognitive function, and this association is disproportionately observed in tasks requiring greater top-down control. We designed the current study to clarify the relationship between childhood fitness and top-down control in terms of functional connectivity among brain regions, by evaluating phase-locking values (PLVs), which is a measure of frequency-specific phase synchrony between electroencephalographic signals during a visual search task...
October 6, 2016: Neuroscience Letters
Maki Kobayashi, Naoko Sakai, Kyoko Kamijo, Harunori Otani, Masaki Hayashi, Hiroshi Koike, Itoko Baba, Takeo Sasamoto, Satoru Nemoto, Tetsuya Shindo, Ichiro Takano
An analytical method for the determination of fluopicolide in livestock products and seafood was developed using LC-MS/MS. Sodium chloride was added to livestock products and seafood samples and fluopicolide was extracted twice with acetone after acidification with formic acid. The fat from the crude extract was removed using a macroporous diatomaceous earth column, followed by purification with a combination of mini-columns of GC (graphite carbon) and PSA (ethylenediamine-N-propyl silylation silica gel). The average recovery (n=5) of fluopicolide from 10 types of livestock products and seafood (cattle fat, cattle liver, cattle muscle, chicken, eel, egg, freshwater clam, honey, milk and salmon) spiked at the MRLs or at the uniform limit (0...
2016: Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
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