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Tanaka A, Matsushita T, Nakatsuji T, Katsui Y, Nagai K, Nishida K, Mukai T, Kuroda R. Setting hinge position distal to the proximal margin of the distal lateral femur reduces the maximum principal strains of the hinge area and risk of hinge fractures. J Exp Orthop 2024; 11:e12015. [PMID: 38590755 PMCID: PMC11000132 DOI: 10.1002/jeo2.12015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Accepted: 03/06/2024] [Indexed: 04/10/2024] Open
Abstract
Purpose The optimal hinge position to prevent hinge fractures in medial closing wedge distal femoral osteotomy (MCWDFO) based on the biomechanical background has not yet been well examined. This study aimed to examine the appropriate hinge position in MCWDFO using finite element (FE) analysis to prevent hinge fractures. Methods Computer-aided design (CAD) models were created using composite replicate femurs. FE models of the MCWDFO with a 5° wedge were created with three different hinge positions: (A) 5 mm proximal to the proximal margin of the lateral epicondylar region, (B) proximal margin level and (C) 5 mm distal to the proximal margin level. The maximum and minimum principal strains in the cortical bone were calculated for each model. To validate the FE analysis, biomechanical tests were performed using composite replicate femurs with the same hinge position models as those in the FE analysis. Results In the FE analysis, the maximum principal strains were in the order of Models A > B > C. The highest value of maximum principal strain was observed in the area proximal to the hinge. In the biomechanical test, hinge fractures occurred in the area proximal to the hinge in Models A and B, whereas the gap closed completely without hinge fractures in Model C. Fractures occurred in an area similar to where the highest maximal principal strain was observed in the FE analysis. Conclusion Distal to the proximal margin of the lateral epicondylar region is an appropriate hinge position in MCWDFO to prevent hinge fractures. Level of Evidence Level V.
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Affiliation(s)
- Atsuki Tanaka
- Department of Orthopaedic SurgeryKobe University Graduate School of MedicineKobeHyogoJapan
| | - Takehiko Matsushita
- Department of Orthopaedic SurgeryKobe University Graduate School of MedicineKobeHyogoJapan
| | - Tatsuya Nakatsuji
- Department of Mechanical EngineeringKobe University Graduate School of EngineeringKobeHyogoJapan
| | - Yosuke Katsui
- Department of Mechanical EngineeringKobe University Graduate School of EngineeringKobeHyogoJapan
| | - Kanto Nagai
- Department of Orthopaedic SurgeryKobe University Graduate School of MedicineKobeHyogoJapan
| | - Kyohei Nishida
- Department of Orthopaedic SurgeryKobe University Graduate School of MedicineKobeHyogoJapan
| | - Toshiji Mukai
- Department of Mechanical EngineeringKobe University Graduate School of EngineeringKobeHyogoJapan
| | - Ryosuke Kuroda
- Department of Orthopaedic SurgeryKobe University Graduate School of MedicineKobeHyogoJapan
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Ota E, Hiyoshi Y, Matsuura N, Ishikawa K, Fujinami F, Mukai T, Yamaguchi T, Nagasaki T, Akiyoshi T, Fukunaga Y. Standardization of preoperative stoma site marking and its utility for preventing stoma leakage: a retrospective study of 519 patients who underwent laparoscopic/robotic rectal cancer surgery. Tech Coloproctol 2023; 27:1387-1392. [PMID: 37358669 DOI: 10.1007/s10151-023-02839-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Accepted: 06/17/2023] [Indexed: 06/27/2023]
Abstract
PURPOSE Stoma site marking is an important preoperative intervention for preventing various stoma-associated complications. In our institution, standardized stoma site marking is routinely performed before rectal cancer surgery with stoma creation, and various stoma-associated factors are recorded in the ostomy-record template. The present study investigated risk factors for stoma leakage. METHODS Our stoma site marking is standardized so that it can be performed by non-stoma specialists. To identify risk factors of stoma leakage at 3 months after surgery, various preoperative factors associated with stoma site marking in our ostomy-record template were retrospectively analyzed in 519 patients who underwent rectal cancer surgery with stoma creation from 2015 to 2020. RESULTS Stoma leakage was seen in 35 of the 519 patients (6.7%). The distance between the stoma site marking and the umbilicus was less than 60 mm in 27 of the 35 patients (77%) who experienced stoma leakage, so a distance of less than 60 mm was identified as an independent risk factor for stoma leakage. Aside from preoperative factors, stoma leakage was also caused by postoperative skin wrinkles or surgical scars near the stoma site in 8 of 35 patients (23%). CONCLUSION Preoperative standardized stoma site marking is necessary to achieve reliable marking that is easy to perform. To reduce the risk of stoma leakage, a distance of 60 mm or more between the stoma site marking and the umbilicus is ideal, and surgeons need to contrive ways to keep surgical scars away from the stoma site.
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Affiliation(s)
- E Ota
- Gastroenterological Center, Department of Gastroenterological Surgery, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - Y Hiyoshi
- Gastroenterological Center, Department of Gastroenterological Surgery, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan.
| | - N Matsuura
- Gastroenterological Center, Department of Wound, Ostomy and Continence (WOC) Nursing, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
| | - K Ishikawa
- Gastroenterological Center, Department of Wound, Ostomy and Continence (WOC) Nursing, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
| | - F Fujinami
- Gastroenterological Center, Department of Wound, Ostomy and Continence (WOC) Nursing, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
| | - T Mukai
- Gastroenterological Center, Department of Gastroenterological Surgery, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - T Yamaguchi
- Gastroenterological Center, Department of Gastroenterological Surgery, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - T Nagasaki
- Gastroenterological Center, Department of Gastroenterological Surgery, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - T Akiyoshi
- Gastroenterological Center, Department of Gastroenterological Surgery, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - Y Fukunaga
- Gastroenterological Center, Department of Gastroenterological Surgery, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan
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Yamauchi R, Fujisawa M, Koyanagi S, Muramatsu A, Kobayashi T, Wada Y, Akama K, Tanaka M, Kurashige H, Sato A, Horiuchi H, Mukai T, Yamamoto Y, Sasaki Y. Formate-producing capacity provided by reducing ability of Streptococcus thermophilus nicotinamide adenine dinucleotide oxidase determines yogurt acidification rate. J Dairy Sci 2023; 106:6710-6722. [PMID: 37211485 DOI: 10.3168/jds.2023-23245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 04/19/2023] [Indexed: 05/23/2023]
Abstract
Yogurt is made by fermenting milk with 2 lactic acid bacteria, Lactobacillus delbrueckii ssp. bulgaricus and Streptococcus thermophilus. To comprehensively understand the protocooperation mechanism between S. thermophilus and L. bulgaricus in yogurt fermentation, we examined 24 combinations of cocultures comprising 7 fast- or slow-acidifying S. thermophilus strains with 6 fast- or slow-acidifying L. bulgaricus strains. Furthermore, 3 NADH oxidase (Nox)-deficient mutants (Δnox) and one pyruvate formate-lyase deficient mutant (ΔpflB) of S. thermophilus were used to evaluate the factor that determines the acidification rate of S. thermophilus. The results revealed that the acidification rate of S. thermophilus monoculture determined the yogurt fermentation rates, despite the coexistence of L. bulgaricus, whose acidification rate was either fast or slow. Significant correlation was found between the acidification rate of S. thermophilus monoculture and the amount of formate production. Result using ΔpflB showed that the formate was indispensable for the acidification of S. thermophilus. Moreover, results of the Δnox experiments revealed that formate production required Nox activity, which not only regulated dissolved oxygen, but also the redox potential. The Nox provided the large decrease in redox potential required by pyruvate formate-lyase to produce formate. A highly significant correlation was found between formate accumulation and Nox activity in S. thermophilus. In conclusion, the formate production ability provided by the action of Nox activity determines the acidification rate of S. thermophilus, and consequently, regulates yogurt coculture fermentation.
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Affiliation(s)
- R Yamauchi
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - M Fujisawa
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - S Koyanagi
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - A Muramatsu
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - T Kobayashi
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - Y Wada
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - K Akama
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - M Tanaka
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - H Kurashige
- Department of Animal Science, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23, Towada, Aomori 034-8628, Japan
| | - A Sato
- Department of Animal Science, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23, Towada, Aomori 034-8628, Japan
| | - H Horiuchi
- Food Science and Technology Research Laboratories, R&D Division, Meiji Co. Ltd., 1-29-1 Nanakuni, Hachioji, Tokyo 192-0919, Japan
| | - T Mukai
- Department of Animal Science, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23, Towada, Aomori 034-8628, Japan
| | - Y Yamamoto
- Department of Animal Science, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23, Towada, Aomori 034-8628, Japan
| | - Y Sasaki
- Graduate School of Agriculture, University of Meiji, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan.
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Yanagisawa Y, Shimizu Y, Mukai T, Sano Y, Odashima K, Ikeo N, Saito H, Yamauchi K, Takahashi T, Kumamoto H. Biodegradation behaviors of magnesium(Mg)-based alloy nails in autologous bone grafts: In vivo study in rabbit skulls. J Appl Biomater Funct Mater 2022; 20:22808000221095230. [PMID: 35599624 DOI: 10.1177/22808000221095230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE In this study, autologous bone grafts using bone-fixing nails made of magnesium-zinc-calcium ternary alloys were performed using rabbit skulls. MATERIAL AND METHODS Two types of nails for bone fixation were prepared: 2.5 mm width, 3 mm length and 2.5 mm width, 2 mm length. A disk-shaped bone with a diameter of 5 mm was resected from the parietal bone and fixed with a 3 mm long nail. As a control group, a 2 mm long nail was driven into the existing bone. The rabbits were sacrificed at 1, 4, 12, and 24 weeks after surgery. The resected samples were observed with micro X-ray CT, and embedded in methyl methacrylate to prepare non-decalcified specimens. The in vivo localization of elements was examined using energy-dispersive X-ray spectroscopy (EDS). RESULTS Micro X-ray CT images of samples showed volume reduction due to degradation in both the bone graft and control groups. No significant difference in the amount of degradation between the two groups was observed, however characteristic degradation processes were observed in each group. The samples stained with alizarin red S showed amorphous areas around the nails, which were considered as corrosion products and contacted directly with the newly formed bones. EDS analysis showed that corrosion products were mainly composed of magnesium and oxygen at an early stage, while calcium and phosphorus were detected on the surface layer during the long-term observation. CONCLUSIONS The degradation speed of the magnesium alloy nails varied depending on the shapes of the nails and surrounding tissue conditions. A calcium phosphate layer was formed on the surface of magnesium alloy nails, suggesting that the degradation rate of the nail was slow.
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Affiliation(s)
- Yuta Yanagisawa
- Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan.,Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
| | - Yoshinaka Shimizu
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University, Kobe, Hyogo, Japan
| | - Yuya Sano
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
| | - Kenji Odashima
- Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan.,Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
| | - Naoko Ikeo
- Department of Mechanical Engineering, Kobe University, Kobe, Hyogo, Japan
| | - Haruka Saito
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
| | - Kensuke Yamauchi
- Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
| | - Tetsu Takahashi
- Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
| | - Hiroyuki Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Miyagi, Japan
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Ro A, Kageyama N, Mukai T. Clinicopathological Characteristics of Cancer-Associated Venous Thromboembolism (CAT-VTE) from a Medicolegal Autopsy. Ann Vasc Dis 2022; 15:101-106. [PMID: 35860820 PMCID: PMC9257395 DOI: 10.3400/avd.oa.22-00034] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 04/05/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ayako Ro
- Department of Legal Medicine, St. Marianna University School of Medicine
| | - Norimasa Kageyama
- Department of Legal Medicine, St. Marianna University School of Medicine
| | - Toshiji Mukai
- Department of Legal Medicine, St. Marianna University School of Medicine
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Nagai T, Hanaoka N, Katano H, Konagaya M, Tanaka-Taya K, Shimizu H, Mukai T, Fujimoto T. A fatal case of acute encephalopathy in a child due to coxsackievirus A2 infection: a case report. BMC Infect Dis 2021; 21:1167. [PMID: 34794380 PMCID: PMC8600809 DOI: 10.1186/s12879-021-06858-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 11/10/2021] [Indexed: 11/10/2022] Open
Abstract
Background Certain types of enteroviruses, including coxsackieviruses, cause encephalitis, and other neurological complications. However, these pathogens rarely cause fatal infections, especially in immunocompetent infants. In this study, we present a rare case of acute encephalopathy caused by coxsackievirus A2 (CV-A2), which progressed rapidly in a previously healthy female child. Case presentation In June 2013, a 26-month-old female child from Kanagawa, Japan, was found unresponsive during sleep. She was healthy until that morning. Her temperature was 37 °C at 08:00. She was feeling fine and went to the nursery that same morning. However, her condition worsened around noon. Therefore, she went home and slept at around 13:00. Surprisingly, after 2 h, her parents checked on her and found that she was lying on her back and was not breathing. Hence, she was immediately taken to a hospital by ambulance, but she was declared dead on arrival at the hospital. Subsequently, pathological autopsy and pathogenetic analysis, including multiple pathogen detection real-time PCR, were conducted to investigate the cause of death. The examination results revealed that she had an infectious respiratory disease and acute encephalopathy due to a CV-A2 infection. Conclusions Based on our findings, we concluded that a previously healthy girl who had no immediate history of underlying medical condition were susceptible to death by acute encephalopathy due to CV-A2 infections. We proposed this conclusion because the patient’s condition progressed rapidly in less than 2 h and eventually led to her death. This is the first report on an acute encephalitis-dependent death in a child due to CV-A2 infection. Supplementary Information The online version contains supplementary material available at 10.1186/s12879-021-06858-2.
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Affiliation(s)
- Tomonori Nagai
- Department of Legal Medicine, ST. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki-shi, Kanagawa, 216-8511, Japan
| | - Nozomu Hanaoka
- Center for Emergency Preparedness and Response, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Harutaka Katano
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Masami Konagaya
- Center for Emergency Preparedness and Response, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Keiko Tanaka-Taya
- Center for Surveillance, Immunization, and Epidemiologic Research, National Institute of Infectious Diseases, 1-23-1 Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Hiroyuki Shimizu
- Department of Virology II, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashimurayama-shi, Tokyo, 208-0011, Japan
| | - Toshiji Mukai
- Department of Legal Medicine, ST. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki-shi, Kanagawa, 216-8511, Japan
| | - Tsuguto Fujimoto
- Center for Emergency Preparedness and Response, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan.
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Odashima K, Shimizu Y, Sano Y, Yamamoto A, Mukai T, Takada Y, Yanagisawa Y, Imai Y, Takahashi T, Kumamoto H. Osteogenic response under the periosteum by magnesium implantation in rat tibia. Dent Mater J 2021; 40:498-507. [PMID: 33642444 DOI: 10.4012/dmj.2020-011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study was designed to examine osteoconductive effects of Mg in rats tibia. The animals were sacrificed after 1, 2, and 8 weeks. The elemental analysis was performed using SEM/EDX at week 1. Following X-ray micrography at weeks 2 and 8, samples were embedded in paraffin. The expression of osteocalcin was observed by immunohistochemical staining. The element concentrations of fibrous capsules around the specimens were also measured by ICP-MS. The concentrations of Ca and P on the surface of the Mg specimen increased in SEM/EDX. The tissue specimen showed new bone formation on the bone surface near the implanted area. The concentrations of Mg, Ca, and P were high in the fibrous capsules surrounding Mg. Implantation induced differentiation of osteoblasts, and this process was considered to be associated with new bone formation. Induction of cell differentiation may be influenced by corrosion products in addition to corroding magnesium.
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Affiliation(s)
- Kenji Odashima
- Division of Oral and Maxillofacial Surgery, Department of Oral and Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Yoshinaka Shimizu
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Yuya Sano
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Akiko Yamamoto
- Biometals Group, Biomaterials Unit, Nano-life Field, International Center for Materials Nanoarchitectonics, National Institute for Materials Science
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University
| | - Yukyo Takada
- Division of Dental Biomaterials, Tohoku University Graduate School of Dentistry, Tohoku University
| | - Yuta Yanagisawa
- Division of Oral and Maxillofacial Surgery, Department of Oral and Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Yoshimichi Imai
- Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine
| | - Tetsu Takahashi
- Division of Oral and Maxillofacial Surgery, Department of Oral and Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Hiroyuki Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Graduate School of Dentistry, Tohoku University
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Wang T, Ikeo N, Okumura K, Akasaka H, Yada R, Yoshida K, Miyawaki D, Ishihara T, Mukumoto N, Shimizu Y, Mukai T, Nakaoka A, Sasaki R. PO-1587: Novel biocompatible artifact-robust and highly visible fiducial marker for image-guided radiotherapy. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01605-4] [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: 10/22/2022]
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Wang T, Inubushi S, Ikeo N, Mukai T, Okumura K, Akasaka H, Yada R, Yoshida K, Miyawaki D, Ishihara T, Nakaoka A, Sasaki R. Novel artifact-robust and highly visible zinc solid fiducial marker for kilovoltage x-ray image-guided radiation therapy. Med Phys 2020; 47:4703-4710. [PMID: 32696571 DOI: 10.1002/mp.14412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 07/10/2020] [Accepted: 07/13/2020] [Indexed: 11/11/2022] Open
Abstract
PURPOSE To develop a novel biocompatible solid fiducial marker that prevents radiopaque imaging artifacts and also maintains high imaging contrast for kilovoltage x-ray image-guided radiation therapy. METHODS The fiducial marker was made of pure zinc. An in-house water-equivalent phantom was designed to evaluate artifacts and visibility under various simulated treatment scenarios. Image artifacts were quantitatively assessed in terms of the metal artifact index (MAI) on kilovoltage computed tomography (CT) and cone-beam CT (CBCT) scans. Marker visibility was evaluated on two types of kilovoltage planar x-ray images in terms of the contrast-to-background ratio (CBR). Comparisons with a conventional gold fiducial marker were conducted. RESULTS The use of zinc rather than a gold marker mitigates imaging artifacts. The MAI near the zinc marker decreased by 76, 79, and 77 % in CT, and by 77 (81), 74 (80), and 79 (85) % in CBCT full-fan (half-fan) scans, when using one-, two-, and three-marker phantom settings, respectively. The high-contrast part of the zinc marker exhibited CBRs above 2.00 for 28/32 exposures under four (lung, tissue, low-density bone, and high-density bone) different simulation scenarios, making its visibility comparable to that of the gold marker (30/32 exposures with CBRs > 2.00). CONCLUSIONS We developed a biocompatible, artifact-robust, and highly visible solid zinc fiducial marker. Although further evaluation is needed in clinical settings, our findings suggest its feasibility and benefits for kilovoltage x-ray image-guided radiation therapy.
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Affiliation(s)
- Tianyuan Wang
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Sachiko Inubushi
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Naoko Ikeo
- Department of Mechanical Engineering, Kobe University Graduate School of Engineering Faculty of Engineering, 1-1 Rokkodai-cho, Kobe, Hyogo, 657-8501, Japan
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University Graduate School of Engineering Faculty of Engineering, 1-1 Rokkodai-cho, Kobe, Hyogo, 657-8501, Japan
| | - Keisuke Okumura
- Centre for Radiology and Radiation Oncology, Kobe University Hospital, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Hiroaki Akasaka
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Ryuichi Yada
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Kenji Yoshida
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Daisuke Miyawaki
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Takeaki Ishihara
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Ai Nakaoka
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
| | - Ryohei Sasaki
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, 7-5-2 Kusunokicho, Chuouku, Kobe, Hyogo, 650-0017, Japan
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Yamaguchi T, Akiyoshi T, Fukunaga Y, Nagayama S, Nagasaki T, Mukai T, Nakanishi R, Konishi T. Robotic extralevator abdominoperineal resection with en bloc multivisceral resection and lateral lymph node dissection for rectal cancer. Tech Coloproctol 2020; 24:1093-1094. [PMID: 32472358 DOI: 10.1007/s10151-020-02256-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Accepted: 05/25/2020] [Indexed: 01/31/2023]
Affiliation(s)
- T Yamaguchi
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan.
| | - T Akiyoshi
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - Y Fukunaga
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - S Nagayama
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - T Nagasaki
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - T Mukai
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - R Nakanishi
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan
| | - T Konishi
- Department of Gastroenterological Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 3-8-31, Ariake, Koto-ku, Tokyo, 135-8550, Japan.
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Okamura Y, Hinata N, Hoshiba T, Nakatsuji T, Ikeo N, Furukawa J, Harada K, Nakano Y, Fukumoto T, Mukai T, Fujisawa M. Development of bioabsorbable zinc-magnesium alloy wire and validation of its application to urinary tract surgeries. World J Urol 2020; 39:201-208. [PMID: 32112243 DOI: 10.1007/s00345-020-03138-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 02/13/2020] [Indexed: 11/26/2022] Open
Abstract
PURPOSE Metallic medical devices are typically constructed from non-bioabsorbable metals that remains in the body and causes considerable complications. Particularly in the urinary tract, calculus, intractable infection, and misdiagnosis as calculus are often caused by non-bioabsorbable metals. Here, we developed a zinc-magnesium alloy as a new bioabsorbable metal and sought to evaluate the bioabsorbable behavior of zinc and zinc-magnesium alloy in a rat bladder implantation model. METHODS We prepared zinc-magnesium alloy wires with various proportions of magnesium and investigated the strength, shape retention, formability, and absorbability of these novel materials. Then, we implanted zinc and zinc-magnesium alloy rings formed by the wires into rat bladder. Rats were euthanized at the end of the observation period, and the rings were removed for volume evaluation. Extracted bladder tissues were subjected to histological analysis. RESULTS The strength of the zinc wire was enhanced by more than fourfold upon the addition of magnesium, without loss of ductility. Linear reduction of ring volume in urine was observed based on the concentration of magnesium within the ring. Nearly all rings were covered with a thin layer of calculus. Histological findings of the transected urinary bladder tissues did not differ among groups. CONCLUSIONS Zinc-magnesium alloy is a promising candidate for use as a bioabsorbable medical device in the urinary tract.
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Affiliation(s)
- Yasuyoshi Okamura
- Department of Urology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Kobe, Japan
| | - Nobuyuki Hinata
- Department of Urology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Kobe, Japan.
| | - Taichi Hoshiba
- Department of Mechanical Engineering, Kobe University, Kobe, Japan
| | | | - Naoko Ikeo
- Department of Mechanical Engineering, Kobe University, Kobe, Japan
| | - Junya Furukawa
- Department of Urology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Kobe, Japan
| | - Kenichi Harada
- Department of Urology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Kobe, Japan
| | - Yuzo Nakano
- Department of Urology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Kobe, Japan
| | - Takumi Fukumoto
- Department of Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University, Kobe, Japan
| | - Masato Fujisawa
- Department of Urology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Kobe, Japan
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12
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Chiba S, Ro A, Ikawa T, Oide Y, Mukai T. Interactions of human organic anion transporters 1-4 and human organic cation transporters 1-3 with the stimulant drug methamphetamine and amphetamine. Leg Med (Tokyo) 2020; 44:101689. [PMID: 32109742 DOI: 10.1016/j.legalmed.2020.101689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 01/29/2020] [Accepted: 02/14/2020] [Indexed: 01/11/2023]
Abstract
Drug membrane transport system proteins, namely, drug transporters, are expressed in the kidney and liver and play a crucial role in the excretion process. This study aimed to elucidate the interactions of the drug transporters human organic anion transporters 1, 2, 3, 4 (hOAT1, 2, 3, 4) and human organic cation transporters 1, 2, 3 (hOCT1, 2, 3), which are expressed primarily in human kidney, liver, and brain, with the stimulants methamphetamine (METH) and amphetamine (AMP). The results of an inhibition study using representative substrates of hOATs and hOCTs showed that METH and AMP significantly inhibited (by >50%) uptake of the hOCT1 and hOCT3 representative substrate 1-methy1-4-phenylpyridinium ion (MPP+) and hOCT2 representative substrate tetraethyl ammonium (TEA). However, METH and AMP did not inhibit uptake of the representative substrates of hOAT1, hOAT2, hOAT3, and hOAT4, (i.e., p-aminohippuric (PAH) acid, prostaglandin F2α (PGF2α), estron sulfate (ES), and ES respectively). Kinetic analyses revealed that METH competitively inhibited hOCT1-mediated MPP+ and hOCT2-mediated TEA uptake (Ki, 16.9 and 78.6 µM, respectively). Similarly, AMP exhibited competitive inhibition, with Ki values of 78.6 and 42.8 µM, respectively. In contrast, hOCT3 exhibited mixed inhibition of representative substrate uptake; hence, calculating Ki values was not possible. Herein, we reveal that hOCTs mediate the inhibition of METH and AMP. The results of this uptake study suggest that METH and AMP bind specifically to hOCT1 and hOCT2 without passing through the cell membrane, with subsequent passage of METH and AMP via hOCT3.
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Affiliation(s)
- Shoetsu Chiba
- Department of Legal Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ward, Kawasaki, Kanagawa 216-8511, Japan.
| | - Ayako Ro
- Department of Legal Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ward, Kawasaki, Kanagawa 216-8511, Japan
| | - Toru Ikawa
- Department of Legal Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ward, Kawasaki, Kanagawa 216-8511, Japan
| | - Yukino Oide
- Department of Legal Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ward, Kawasaki, Kanagawa 216-8511, Japan
| | - Toshiji Mukai
- Department of Legal Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ward, Kawasaki, Kanagawa 216-8511, Japan
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Kanno S, Hirano S, Kato H, Fukuta M, Mukai T, Aoki Y. Benzalkonium chloride and cetylpyridinium chloride induce apoptosis in human lung epithelial cells and alter surface activity of pulmonary surfactant monolayers. Chem Biol Interact 2020; 317:108962. [DOI: 10.1016/j.cbi.2020.108962] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 12/27/2019] [Accepted: 01/19/2020] [Indexed: 12/24/2022]
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Sakuta K, Mukai T, Hasegawa I, Okuno K, Tanaka T, Yaguchi H. External validation of the nag scale for predicting hematoma expansion in patients with acute intracerebral hemorrhage. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.472] [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: 10/25/2022]
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15
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Urade T, Yoshida T, Ikeo N, Naka K, Kido M, Toyama H, Ueno K, Tanaka M, Mukai T, Fukumoto T. Novel biodegradable magnesium alloy clips compared with titanium clips for hepatectomy in a rat model. BMC Surg 2019; 19:130. [PMID: 31500601 PMCID: PMC6734318 DOI: 10.1186/s12893-019-0600-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Accepted: 09/02/2019] [Indexed: 11/13/2022] Open
Abstract
Background The use of surgical metal clips is crucial for ligating vessels in various operations. The currently available metal clips have several drawbacks; they are permanent and interfere with imaging techniques such as computed tomography (CT) or magnetic resonance (MR) imaging and carry the potential risk of endo-clip migration. We recently developed a novel magnesium (Mg) alloy for biodegradable clips that reduces artifacts on CT imaging. This study aimed to examine the tolerance, biodegradability, and biocompatibility of the Mg alloy clips compared with those of standard titanium (Ti) clips in hepatectomy. Methods Thirty Wistar rats were divided into two groups based on the clip used (groups A and B). The vascular pedicle, including hepatic artery, portal vein, bile duct, and hepatic vein of the left lateral lobe, was ligated with the Ti clip in group A or the Mg alloy clip in group B, and then the left lateral lobe was removed. The rats were sacrificed at 1, 4, 12, 24, and 36 weeks after surgery. Clinical and histological evaluations were performed. Absorption rate was calculated by measuring the clip volume. Results Although the Mg alloy clips showed biodegradability over time, there were no significant differences in the serum concentration of Mg between the two groups. The remaining volume ratio of Mg alloy clips was 95.5, 94.3, 80.0, 36.2, and 16.7% at 1, 4, 12, 24, and 36 weeks, respectively. No side effects occurred. Most of the microscopic changes were similar in both groups. Conclusions The new biodegradable Mg alloy clips are safe and feasible in vessel ligation for hepatectomy in a rat model and reduce artifacts in CT imaging compared with the standard Ti clips.
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Affiliation(s)
- Takeshi Urade
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan.
| | - Toshihiko Yoshida
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Naoko Ikeo
- Department of Mechanical Engineering, Kobe University, Kobe, Japan
| | - Kosuke Naka
- Department of Mechanical Engineering, Kobe University, Kobe, Japan
| | - Masahiro Kido
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Hirochika Toyama
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Kimihiko Ueno
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Motofumi Tanaka
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University, Kobe, Japan
| | - Takumi Fukumoto
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
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Tsuji S, Matsuzaki H, Iseki M, Nagasu A, Hirano H, Ishihara K, Ueda N, Honda Y, Horiuchi T, Nishikomori R, Morita Y, Mukai T. Functional analysis of a novel G87V TNFRSF1A mutation in patients with TNF receptor-associated periodic syndrome. Clin Exp Immunol 2019; 198:416-429. [PMID: 31429073 DOI: 10.1111/cei.13365] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/14/2019] [Indexed: 12/17/2022] Open
Abstract
Tumor necrosis factor (TNF) receptor-associated periodic syndrome (TRAPS) is an autoinflammatory disease that is caused by heterozygous mutations in the TNFRSF1A gene. Although more than 150 TNFRSF1A mutations have been reported to be associated with TRAPS phenotypes only a few, such as p.Thr79Met (T79M) and cysteine mutations, have been functionally analyzed. We identified two TRAPS patients in one family harboring a novel p.Gly87Val (G87V) mutation in addition to a p.Thr90Ile (T90I) mutation in TNFRSF1A. In this study, we examined the functional features of this novel G87V mutation. In-vitro analyses using mutant TNF receptor 1 (TNF-R1)-over-expressing cells demonstrated that this mutation alters the expression and function of TNF-R1 similar to that with the previously identified pathogenic T79M mutation. Specifically, cell surface expression of the mutant TNF-R1 in transfected cells was inhibited with both G87V and T79M mutations, whereas the T90I mutation did not affect this. Moreover, peripheral blood mononuclear cells (PBMCs) from TRAPS patients harboring the G87V and T90I mutations showed increased mitochondrial reactive oxygen species (ROS). Furthermore, the effect of various Toll-like receptor (TLR) ligands on inflammatory responses was explored, revealing that PBMCs from TRAPS patients are hyper-responsive to TLR-2 and TLR-4 ligands and that interleukin (IL)-8 and granulocyte-macrophage colony-stimulating factor (GM-CSF) are likely to be involved in the pathogenesis of TRAPS. These findings suggest that the newly identified G87V mutation is one of the causative mutations of TRAPS. Our findings based on unique TRAPS-associated mutations provide novel insight for clearer understanding of inflammatory responses, which would be basic findings of developing a new therapeutic and prophylactic approach to TRAPS.
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Affiliation(s)
- S Tsuji
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - H Matsuzaki
- Department of Life Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, Shobara, Hiroshima, Japan
| | - M Iseki
- Department of Immunology and Molecular Genetics, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - A Nagasu
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - H Hirano
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - K Ishihara
- Department of Immunology and Molecular Genetics, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - N Ueda
- Department of Internal Medicine, Miyazaki Prefectural Miyazaki Hospital, Miyazaki, Japan
| | - Y Honda
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Horiuchi
- Department of Internal Medicine, Kyushu University Beppu Hospital, Beppu, Oita, Japan
| | - R Nishikomori
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Y Morita
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - T Mukai
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
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17
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Ro A, Mori S, Sugiura H, Furukawa T, Asakura K, Kimura S, Kageyama N, Chiba S, Mukai T. An autopsy case of pulmonary artery intimal sarcoma: detailed observation of tumor and its related lesions in pulmonary arteries. Cardiovasc Pathol 2019; 43:107143. [PMID: 31437715 DOI: 10.1016/j.carpath.2019.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Revised: 07/03/2019] [Accepted: 07/12/2019] [Indexed: 11/16/2022] Open
Abstract
We report an autopsy-proven case of a 33-year-old man who died of intimal sarcoma of the pulmonary artery. A large mass (5×4 cm) occluded the main and bilateral pulmonary arteries. Tumor cell morphology was consistent with that of undifferentiated pleomorphic sarcoma. Comprehensive histological observation of 18 pulmonary arteries from proximal to distal revealed continuous extension of the tumor from the main to the subsegmental arteries along the intima, forming an arteriosclerosis-like intimal thickening. Distal small arteries were also affected by eccentric intimal thickening or recanalization. Lung parenchyma was not involved, although there were two wedge-shaped small pulmonary infarctions caused by tumorous obstruction of the associated arteries. Histological results indicated that the intimal sarcoma in the pulmonary artery, which appeared occlusive with growth limited to the proximal artery, had in fact already spread more peripherally than expected. Both the proximal lesions and the distal small arteries were affected by peripheral tumor emboli or by pulmonary hypertension induced by the proximal tumor. However, as seen in this case, most of the occlusive tumor was located locally and intraluminally, in the proximal artery, and removing the proximal tumor by pulmonary endarterectomy was considered effective for symptomatic improvement.
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Affiliation(s)
- Ayako Ro
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan; Tokyo Medical Examiner's Office, Tokyo,112-0012, Japan.
| | | | - Hiroaki Sugiura
- Department of Radiology, National Defense Medical College, Saitama, 359-8513, Japan
| | - Toshiyuki Furukawa
- Syncope Unit, Toyoko Hospital, St. Marianna University, Kanagawa, 211-0063, Japan
| | | | - Satoko Kimura
- Tokyo Medical Examiner's Office, Tokyo,112-0012, Japan
| | - Norimasa Kageyama
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan; Tokyo Medical Examiner's Office, Tokyo,112-0012, Japan
| | - Shoetsu Chiba
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Toshiji Mukai
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
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Ro A, Mori S, Kageyama N, Chiba S, Mukai T. Ruptured Syphilitic Aneurysm: A Cause of Sudden Death in a Man with Human Immunodeficiency Coinfection. J Forensic Sci 2019; 64:1555-1558. [DOI: 10.1111/1556-4029.14046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 02/22/2019] [Accepted: 02/27/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Ayako Ro
- Department of Legal Medicine St. Marianna University School of Medicine Kanagawa 216‐8511 Japan
- Tokyo Medical Examiner's Office Otuska 4‐21‐18, Bunkyo‐ku Tokyo 112‐0012 Japan
| | - Shinjirou Mori
- Tokyo Medical Examiner's Office Otuska 4‐21‐18, Bunkyo‐ku Tokyo 112‐0012 Japan
| | - Norimasa Kageyama
- Department of Legal Medicine St. Marianna University School of Medicine Kanagawa 216‐8511 Japan
- Tokyo Medical Examiner's Office Otuska 4‐21‐18, Bunkyo‐ku Tokyo 112‐0012 Japan
| | - Shoetsu Chiba
- Department of Legal Medicine St. Marianna University School of Medicine Kanagawa 216‐8511 Japan
| | - Toshiji Mukai
- Department of Legal Medicine St. Marianna University School of Medicine Kanagawa 216‐8511 Japan
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19
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Ro A, Chiba S, Sagi M, Kageyama N, Hayashida M, Ikawa T, Oide Y, Ichiba K, Mukai T. Abdominal Stab Wounds with Tension Pneumopericardium Confirmed by Autopsy and Postmortem Computed Tomography. J Forensic Sci 2019; 64:1544-1547. [PMID: 30786026 DOI: 10.1111/1556-4029.14028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 01/25/2019] [Accepted: 01/28/2019] [Indexed: 01/02/2023]
Abstract
We present the first report of pneumopericardium observed by autopsy and on postmortem computed tomography (PMCT) images. The subject was a woman who died of self-inflicted stab wounds to the abdomen. The PMCT scan revealed air in the pericardial sac, a "flattened heart" sign, and retroperitoneal hemorrhage. Medicolegal autopsy revealed two abdominal stab wounds near the xiphoid process that had cut the apical pericardium and adjacent diaphragm and liver. Examination of the open thorax confirmed that the pericardial sac was distended with air. The wound extended to the abdominal aorta, causing retroperitoneal hemorrhage. PMCT images showed that the pneumopericardial volume was 133 mL. We believe that cardiac tamponade occurred resulting from the tension pneumopericardium; however, the effects were mitigated by hypovolemia secondary to the retroperitoneal hemorrhage as well as obstructive shock. Therefore, the cause of death appears to have been low-pressure cardiac tamponade.
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Affiliation(s)
- Ayako Ro
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Shoetsu Chiba
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Morihisa Sagi
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Norimasa Kageyama
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Makiko Hayashida
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Toru Ikawa
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Yukino Oide
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Kazue Ichiba
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
| | - Toshiji Mukai
- Department of Legal Medicine, St. Marianna University School of Medicine, Kanagawa, 216-8511, Japan
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Sato T, Shimizu Y, Odashima K, Sano Y, Yamamoto A, Mukai T, Ikeo N, Takahashi T, Kumamoto H. In vitro and in vivo analysis of the biodegradable behavior of a magnesium alloy for biomedical applications. Dent Mater J 2019; 38:11-21. [PMID: 30158349 DOI: 10.4012/dmj.2017-324] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present study was designed to investigate the biodegradation behavior of Mg alloy plates in the maxillofacial region. For in vitro analysis, the plates were immersed in saline solution and simulated body fluid. For in vivo, the plates were implanted into the tibia, head, back, abdominal cavity, and femur and assessed at 1, 2, and 4 weeks after implantation. After implantation, the plate volumes and the formed insoluble salt were measured via micro-computed tomography. SEM/EDX analysis of the insoluble salt and histological analysis of the surrounding tissues were performed. The volume loss of plates in the in vitro groups was higher than that in the in vivo groups. The volume loss was fastest in the abdomen, followed by the head, back, tibia, and femur. There were no statistically significant differences in the insoluble salt volume of the all implanted sites. The corrosion of the Mg alloy will be affected to the surrounding tissue responses. The material for the plate should be selected based on the characteristic that Mg alloys are decomposed relatively easily in the maxillofacial region.
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Affiliation(s)
- Takumi Sato
- Division of Oral and Maxillofacial Surgery, Department of Oral and Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Yoshinaka Shimizu
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Kenji Odashima
- Division of Oral and Maxillofacial Surgery, Department of Oral and Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Yuya Sano
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Akiko Yamamoto
- Biometals Group, Biomaterials Unit, Nano-life Field, International Center for Materials Nanoarchitectonics, National Institute for Materials Science
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University
| | - Naoko Ikeo
- Department of Mechanical Engineering, Kobe University
| | - Tetsu Takahashi
- Division of Oral and Maxillofacial Surgery, Department of Oral and Medicine and Surgery, Graduate School of Dentistry, Tohoku University
| | - Hiroyuki Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Graduate School of Dentistry, Tohoku University
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Aiba T, Uehara K, Mukai T, Hattori N, Nakayama G, Nagino M. Transanal extended rectal surgery with lateral pelvic lymph node dissection. Tech Coloproctol 2018; 22:893-894. [PMID: 30483903 DOI: 10.1007/s10151-018-1891-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 11/19/2018] [Indexed: 10/27/2022]
Affiliation(s)
- T Aiba
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Aichi, Japan
| | - K Uehara
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Aichi, Japan.
| | - T Mukai
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Aichi, Japan
| | - N Hattori
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - G Nakayama
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - M Nagino
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Aichi, Japan
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Sato A, Shimizu Y, Imai Y, Mukai T, Yamamoto A, Miura C, Muraki K, Sano Y, Ikeo N, Tachi M. Initial organ distribution and biological safety of Mg
2+
released from a Mg alloy implant. Biomed Mater 2018; 13:035006. [DOI: 10.1088/1748-605x/aaa9d5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Mukai T, Okamoto T, Taminato T, Lin Y, Araki M, Sato W, Yamamura T, Takahashi Y. Neurological adverse events after fingolimod administration in patients with multiple sclerosis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2225] [Citation(s) in RCA: 1] [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: 11/30/2022]
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Mukai Y, Miyazaki M, Mukai T, Tasaki A, Yuji T, Murata M. The pharmacokinetics of patients with Parkinson’s disease receiving levodopa-carbidopa intestinal gel infusion therapy. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1652] [Citation(s) in RCA: 1] [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: 11/15/2022]
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Kinboshi M, Mukai T, Nagao Y, Shimizu S, Ito H, Ikeda A, Ohno Y. Dysfunction of astrocytic Kir4.1 channels induces BDNF expression. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3746] [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: 10/18/2022]
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Mukai T, Nagamura-Inoue T. Neurotropism and neuroprotective effect in umbilical cord derived-mesenchymal stromal cells. Cytotherapy 2017. [DOI: 10.1016/j.jcyt.2017.02.058] [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: 11/28/2022]
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Ihara K, Fukano C, Ayabe T, Fukami M, Ogata T, Kawamura T, Urakami T, Kikuchi N, Yokota I, Takemoto K, Mukai T, Nishii A, Kikuchi T, Mori T, Shimura N, Sasaki G, Kizu R, Takubo N, Soneda S, Fujisawa T, Takaya R, Kizaki Z, Kanzaki S, Hanaki K, Matsuura N, Kasahara Y, Kosaka K, Takahashi T, Minamitani K, Matsuo S, Mochizuki H, Kobayashi K, Koike A, Horikawa R, Teno S, Tsubouchi K, Mochizuki T, Igarashi Y, Amemiya S, Sugihara S. FUT2 non-secretor status is associated with Type 1 diabetes susceptibility in Japanese children. Diabet Med 2017; 34:586-589. [PMID: 27859559 DOI: 10.1111/dme.13288] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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] [Accepted: 11/15/2016] [Indexed: 01/04/2023]
Abstract
AIM To examine the contribution of the FUT2 gene and ABO blood type to the development of Type 1 diabetes in Japanese children. METHODS We analysed FUT2 variants and ABO genotypes in a total of 531 Japanese children diagnosed with Type 1 diabetes and 448 control subjects. The possible association of FUT2 variants and ABO genotypes with the onset of Type 1 diabetes was statistically examined. RESULTS The se2 genotype (c.385A>T) of the FUT2 gene was found to confer susceptibility to Type 1A diabetes in a recessive effects model [odds ratio for se2/se2, 1.68 (95% CI 1.20-2.35); corrected P value = 0.0075]. CONCLUSIONS The FUT2 gene contributed to the development of Type 1 diabetes in the present cohort of Japanese children.
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Affiliation(s)
- K Ihara
- Department of Paediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
- Department of Paediatrics, Oita University School of Medicine, Yufu, Japan
| | - C Fukano
- Department of Paediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T Ayabe
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - M Fukami
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - T Ogata
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
- Department of Paediatrics, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - T Kawamura
- Department of Paediatrics, Osaka City University Hospital, Osaka, Japan
| | - T Urakami
- Department of Paediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan
| | - N Kikuchi
- Department of Paediatrics, Yokohama City Minato Red Cross Hospital, Yokohama, Japan
| | - I Yokota
- Department of Clinical Laboratory, Shikoku Medical Center for Children and Adults, Zentsuji, Japan
- Department of Paediatrics, Graduate School of Medical Sciences Tokushima University, Tokushima, Japan
| | - K Takemoto
- Department of Paediatrics, Ehime University Hospital, Toon, Japan
- Department of Paediatrics, Sumitomo Besshi Hospital, Niihama, Japan
| | - T Mukai
- Department of Paediatrics, Asahikawa Medical University Hospital, Asahikawa, Japan
- Department of Paediatrics, Asahikawa-Kosei General Hospital, Asahikawa, Japan
| | - A Nishii
- Department of Paediatrics, JR Sendai Hospital, Sendai, Japan
| | - T Kikuchi
- Department of Paediatrics, Saitama Medical University Hospital, Saitama, Japan
- Department of Paediatrics, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - T Mori
- Department of Paediatrics, Nagano Red Cross Hospital, Nagano, Japan
- Department of Paediatrics, Shinshu Ueda Medical Centre, Ueda, Japan
| | - N Shimura
- Department of Paediatrics, Dokkyo Medical University Hospital, Shimotsuga, Japan
| | - G Sasaki
- Department of Paediatrics, Tokyo Dental College Ichikawa General Hospital, Ichikawa, Japan
| | - R Kizu
- Department of Paediatrics, Yokosuka Kyosai Hospital, Yokosuka, Japan
| | - N Takubo
- Department of Pediatrics, Kitasato University Hospital, Sagamihara, Japan
- Department of Paediatrics and Adolescent Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - S Soneda
- Department of Paediatrics, St Marianna University School of Medicine, Kawasaki, Japan
| | - T Fujisawa
- Department of Paediatrics, National Mie Hospital, Tsu, Japan
| | - R Takaya
- Department of Paediatrics, Osaka Medical College, Takatsuki, Japan
| | - Z Kizaki
- Department of Paediatrics, Japanese Red Cross Kyoto Daiichi Hospital, Kyoto, Japan
| | - S Kanzaki
- Department of Paediatrics, Tottori University Faculty of Medicine, Yonago, Japan
| | - K Hanaki
- Department of Paediatrics, Tottori Prefectural Kousei Hospital, Kurayoshi, Japan
| | - N Matsuura
- Department of Paediatrics, Teine Keijinkai Hospital, Sapporo, Japan
- Department of Early Childhood Care and Education, Seitoku University Junior College, Matsudo, Japan
| | - Y Kasahara
- Department of Paediatrics, Kanazawa University, Kanazawa, Japan
| | - K Kosaka
- Department of Paediatrics, University Hospital, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | | | - K Minamitani
- Department of Paediatrics, Teikyo University Chiba Medical Center, Ichihara, Japan
| | - S Matsuo
- Matsuo Kodomo Clinic, Kyoto, Japan
| | - H Mochizuki
- Department of Metabolism and Endocrinology, Saitama Children's Medical Centre, Saitama, Japan
| | - K Kobayashi
- Department of Paediatrics, University of Yamanashi Hospital, Chuo, Japan
| | - A Koike
- Miyanosawa Koike Child Clinic, Sapporo, Japan
| | - R Horikawa
- Division of Endocrinology and Metabolism, Department of Medical Subspecialties, National Medical Centre for Children and Mothers, Tokyo, Japan
| | - S Teno
- Teno Clinic, Izumo, Japan
| | - K Tsubouchi
- Department of Paediatrics, Chuno Kosei Hospital, Seki, Japan
| | - T Mochizuki
- Department of Paediatrics, Osaka City General Hospital, Osaka, Japan
- Department of Paediatrics, Osaka Police Hospital, Osaka, Japan
| | - Y Igarashi
- Igarashi Children's Clinic, Sendai, Japan
| | - S Amemiya
- Department of Paediatrics, Saitama Medical University Hospital, Saitama, Japan
| | - S Sugihara
- Department of Paediatrics, Tokyo Women's Medical University Medical Centre East, Tokyo, Japan
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Yoshida T, Fukumoto T, Urade T, Kido M, Toyama H, Asari S, Ajiki T, Ikeo N, Mukai T, Ku Y. Development of a new biodegradable operative clip made of a magnesium alloy: Evaluation of its safety and tolerability for canine cholecystectomy. Surgery 2017; 161:1553-1560. [PMID: 28159116 DOI: 10.1016/j.surg.2016.12.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 12/03/2016] [Accepted: 12/19/2016] [Indexed: 02/02/2023]
Abstract
BACKGROUND Operative clips used to ligate vessels in abdominal operation usually are made of titanium. They remain in the body permanently and form metallic artifacts in computed tomography images, which impair accurate diagnosis. Although biodegradable magnesium instruments have been developed in other fields, the physical properties necessary for operative clips differ from those of other instruments. We developed a biodegradable magnesium-zinc-calcium alloy clip with good biologic compatibility and enough clamping capability as an operative clip. In this study, we verified the safety and tolerability of this clip for use in canine cholecystectomy. METHODS Nine female beagles were used. We performed cholecystectomy and ligated the cystic duct by magnesium alloy or titanium clips. The chronologic change of clips and artifact formation were compared at 1, 4, 12, 18, and 24 weeks postoperative by computed tomography. The animals were killed at the end of the observation period, and the clips were removed to evaluate their biodegradability. We also evaluated their effect on the living body by blood biochemistry data. RESULTS The magnesium alloy clip formed much fewer artifacts than the titanium clip, and it was almost absorbed at 6 months postoperative. There were no postoperative complications and no elevation of constituent elements such as magnesium, calcium, and zinc during the observation period in both groups. CONCLUSION The novel magnesium alloy clip demonstrated sufficient sealing capability for the cystic duct and proper biodegradability in canine models. The magnesium alloy clip revealed much fewer metallic artifacts in CT than the conventional titanium clip.
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Affiliation(s)
- Toshihiko Yoshida
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan
| | - Takumi Fukumoto
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan.
| | - Takeshi Urade
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan
| | - Masahiro Kido
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan
| | - Hirochika Toyama
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan
| | - Sadaki Asari
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan
| | - Tetsuo Ajiki
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan
| | - Naoko Ikeo
- Department of Mechanical Engineering, Kobe University, Nada-ku, Kobe, Hyogo, Japan
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University, Nada-ku, Kobe, Hyogo, Japan
| | - Yonson Ku
- Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Hyogo, Japan
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Abstract
Here the pathophysiology of venous thromboembolism is reviewed with respect to the anatomical features of the deep veins of lower limbs. A thrombus is less likely to form in the thigh veins compared with that in the calf veins; however, clinical symptoms are more likely to appear in the thigh veins owing to vascular occlusion. When a patient is bedridden, thrombosis is more likely to occur in the intramuscular vein, which mainly depends on muscular pumping and the venous valve, rather than in the three crural branches, which mainly depends on the pulsation of the accompanying artery. Thrombi are prone to be generated in the soleal vein compared with those in the gastrocnemius vein because of the vein and muscle structures. A soleal vein thrombosis grows toward the proximal veins along the drainage veins. To prevent a sudden pulmonary thromboembolism-related death in bedridden patients, preventing soleal vein thrombus formation and observing the thrombus proximal propagation via the drainage veins are clinically important. When deep vein thrombosis occurs, avoiding embolization and sequela caused by the thrombus organization is necessary.
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Affiliation(s)
- Ayako Ro
- Department of Legal Medicine, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan.,Tokyo Medical Examiner's Office, Tokyo, Japan
| | - Norimasa Kageyama
- Department of Legal Medicine, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan.,Tokyo Medical Examiner's Office, Tokyo, Japan
| | - Toshiji Mukai
- Department of Legal Medicine, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan.,Tokyo Medical Examiner's Office, Tokyo, Japan
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Ayabe T, Fukami M, Ogata T, Kawamura T, Urakami T, Kikuchi N, Yokota I, Ihara K, Takemoto K, Mukai T, Nishii A, Kikuchi T, Mori T, Shimura N, Sasaki G, Kizu R, Takubo N, Soneda S, Fujisawa T, Takaya R, Kizaki Z, Kanzaki S, Hanaki K, Matsuura N, Kasahara Y, Kosaka K, Takahashi T, Minamitani K, Matsuo S, Mochizuki H, Kobayashi K, Koike A, Horikawa R, Teno S, Tsubouchi K, Mochizuki T, Igarashi Y, Amemiya S, Sugihara S. Variants associated with autoimmune Type 1 diabetes in Japanese children: implications for age-specific effects of cis-regulatory haplotypes at 17q12-q21. Diabet Med 2016; 33:1717-1722. [PMID: 27352912 DOI: 10.1111/dme.13175] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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] [Received: 02/16/2016] [Revised: 05/08/2016] [Accepted: 06/27/2016] [Indexed: 12/11/2022]
Abstract
AIMS The aim of this study was to clarify the significance of previously reported susceptibility variants in the development of autoimmune Type 1 diabetes in non-white children. Tested variants included rs2290400, which has been linked to Type 1 diabetes only in one study on white people. Haplotypes at 17q12-q21 encompassing rs2290400 are known to determine the susceptibility of early-onset asthma by affecting the expression of flanking genes. METHODS We genotyped 63 variants in 428 Japanese people with childhood-onset autoimmune Type 1 diabetes and 457 individuals without diabetes. Possible association between variants and age at diabetes onset was examined using age-specific quantitative trait locus analysis and ordered-subset regression analysis. RESULTS Ten variants, including rs2290400 in GSDMB, were more frequent among the people with Type 1 diabetes than those without diabetes. Of these, rs689 in INS and rs231775 in CTLA4 yielded particularly high odds ratios of 5.58 (corrected P value 0.001; 95% CI 2.15-14.47) and 1.64 (corrected P value 5.3 × 10-5 ; 95% CI 1.34-2.01), respectively. Age-specific effects on diabetes susceptibility were suggested for rs2290400; heterozygosity of the risk alleles was associated with relatively early onset of diabetes, and the allele was linked to the phenotype exclusively in the subgroup of age at onset ≤ 5.0 years. CONCLUSIONS The results indicate that rs2290400 in GSDMB and polymorphisms in INS and CTLA4 are associated with the risk of Type 1 diabetes in Japanese children. Importantly, cis-regulatory haplotypes at 17q12-q21 encompassing rs2290400 probably determine the risk of autoimmune Type 1 diabetes predominantly in early childhood.
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Affiliation(s)
- T Ayabe
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - M Fukami
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - T Ogata
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
- Department of Pediatrics, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - T Kawamura
- Department of Pediatrics, Osaka City University Hospital, Osaka, Japan
| | - T Urakami
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan
| | - N Kikuchi
- Department of Pediatrics, Yokohama City Minato Red Cross Hospital, Yokohama, Japan
| | - I Yokota
- Department of Clinical Laboratory, Shikoku Medical Center for Children and Adults, Zentsuji, Japan
- Department of Pediatrics, Graduate School of Medical Sciences Tokushima University, Tokushima, Japan
| | - K Ihara
- Department of Pediatrics, Kyushu University Hospital, Fukuoka, Japan
- Department of Pediatrics, Oita University Hospital, Yufu, Japan
| | - K Takemoto
- Department of Pediatrics, Ehime University Hospital, Toon, Japan
- Department of Pediatrics, Sumitomo Besshi Hospital, Niihama, Japan
| | - T Mukai
- Department of Pediatrics, Asahikawa Medical University Hospital, Asahikawa, Japan
- Department of Pediatrics, Asahikawa-Kosei General Hospital, Asahikawa, Japan
| | - A Nishii
- Department of Pediatrics, JR Sendai Hospital, Sendai, Japan
| | - T Kikuchi
- Department of Pediatrics, Saitama Medical University Hospital, Saitama, Japan
- Department of Pediatrics, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - T Mori
- Department of Pediatrics, Nagano Red Cross Hospital, Nagano, Japan
- Department of Pediatrics, Shinshu Ueda Medical Center, Ueda, Japan
| | - N Shimura
- Department of Pediatrics, Dokkyo Medical University Hospital, Shimotsuga, Japan
| | - G Sasaki
- Department of Pediatrics, Tokyo Dental College Ichikawa General Hospital, Ichikawa, Japan
| | - R Kizu
- Department of Pediatrics, Yokosuka Kyosai Hospital, Yokosuka, Japan
| | - N Takubo
- Department of Pediatrics, Kitasato University Hospital, Sagamihara, Japan
- Department of Pediatrics and Adolescent Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - S Soneda
- Department of Pediatrics, St. Marianna University School of Medicine, Kawasaki, Japan
| | - T Fujisawa
- Department of Pediatrics, National Mie Hospital, Tsu, Japan
| | - R Takaya
- Department of Pediatrics, Osaka Medical College, Takatsuki, Japan
| | - Z Kizaki
- Department of Pediatrics, Japanese Red Cross Kyoto Daiichi Hospital, Kyoto, Japan
| | - S Kanzaki
- Department of Pediatrics, Tottori University Faculty of Medicine, Yonago, Japan
| | - K Hanaki
- Department of Pediatrics, Tottori Prefectural Kousei Hospital, Kurayoshi, Japan
| | - N Matsuura
- Department of Pediatrics, Teine Keijinkai Hospital, Sapporo, Japan
- Department of Early Childhood Care and Education, Seitoku University Junior College, Matsudo, Japan
| | - Y Kasahara
- Department of Pediatrics, Kanazawa University, Kanazawa, Japan
| | - K Kosaka
- Department of Pediatrics, University Hospital, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | | | - K Minamitani
- Department of Pediatrics, Teikyo University Chiba Medical Center, Ichihara, Japan
| | - S Matsuo
- Matsuo Kodomo Clinic, Kyoto, Japan
| | - H Mochizuki
- Department of Metabolism and Endocrinology, Saitama Children's Medical Center, Saitama, Japan
| | - K Kobayashi
- Department of Pediatrics, University of Yamanashi Hospital, Chuo, Japan
| | - A Koike
- Miyanosawa Koike Child Clinic, Sapporo, Japan
| | - R Horikawa
- Division of Endocrinology and Metabolism, Department of Medical Subspecialties, National Medical Center for Children and Mothers, Tokyo, Japan
| | - S Teno
- Teno Clinic, Izumo, Japan
| | - K Tsubouchi
- Department of Pediatrics, Chuno Kosei Hospital, Seki, Japan
| | - T Mochizuki
- Department of Pediatrics, Osaka City General Hospital, Osaka, Japan
- Department of Pediatrics, Osaka Police Hospital, Osaka, Japan
| | - Y Igarashi
- Igarashi Children's Clinic, Sendai, Japan
| | - S Amemiya
- Department of Pediatrics, Saitama Medical University Hospital, Saitama, Japan
| | - S Sugihara
- Department of Pediatrics, Tokyo Women's Medical University Medical Center East, Tokyo, Japan
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Mukai T, Nagamura-Inoue T, Shimazu T, Mori Y, Takahashi A, Tojo A. Neurosphere Formation Enhances the Neurogenic Differentiation Potential and Migratory Ability of Umbilical Cord-Mesenchymal Stromal Cells. Cytotherapy 2016. [DOI: 10.1016/j.jcyt.2016.03.161] [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: 11/29/2022]
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Miura C, Shimizu Y, Imai Y, Mukai T, Yamamoto A, Sano Y, Ikeo N, Isozaki S, Takahashi T, Oikawa M, Kumamoto H, Tachi M. In vivo corrosion behaviour of magnesium alloy in association with surrounding tissue response in rats. ACTA ACUST UNITED AC 2016; 11:025001. [PMID: 26947358 DOI: 10.1088/1748-6041/11/2/025001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Biodegradable magnesium (Mg) alloys are the most promising candidates for osteosynthesis devices. However, their in vivo corrosion behaviour has not been fully elucidated. The aim of this study was to clarify the influence of the physiological environment surrounding Mg alloys on their corrosion behaviour. A Mg-1.0Al alloy with a fine-grained structure was formed into plates using titanium (Ti) as a control. These plates were implanted into the subperiosteum in the head, subcutaneous tissue of the back, and in the muscle of the femur of rats for 1, 2 and 4 weeks. The volumes of the remaining Mg alloy and of the insoluble salt deposition and gas cavities around the Mg alloy were determined by microtomography, and the volume losses were calculated. Then, the tissue response around the plates in each implantation site was examined histopathologically, and its relation to the respective volume loss was analyzed. These analyses determined that the Mg alloy was corroded fastest in the head, at an intermediate level in the back, and slowest in the femur. The insoluble salt deposition at the Mg alloy surface had no influence on the volume loss. Gas cavities formed around the Mg alloy at all implantation sites and decreased after 4 weeks. Histopathological examination revealed that the Mg alloy exhibited good biocompatibility, as was seen with Ti. In addition, vascularized fibrous capsules formed around the plates and became mature with time. Notably, the volume loss in the different anatomical locations correlated with capsule thickness. Together, our results suggest that, to facilitate the successful clinical application of Mg alloys, it will be necessary to further comprehend their interactions with specific in vivo environments.
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Affiliation(s)
- Chieko Miura
- Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan
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Ikeo N, Nakamura R, Naka K, Hashimoto T, Yoshida T, Urade T, Fukushima K, Yabuuchi H, Fukumoto T, Ku Y, Mukai T. Fabrication of a magnesium alloy with excellent ductility for biodegradable clips. Acta Biomater 2016; 29:468-476. [PMID: 26485165 DOI: 10.1016/j.actbio.2015.10.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 10/06/2015] [Accepted: 10/15/2015] [Indexed: 11/18/2022]
Abstract
To develop a biodegradable clip, the equivalent plastic strain distribution during occlusion was evaluated by the finite element analysis (FEA) using the material data of pure Mg. Since the FEA suggested that a maximum plastic strain of 0.40 is required to allow the Mg clips, the alloying of magnesium with essential elements and the control of microstructure by hot extrusion and annealing were conducted. Mechanical characterization revealed that the Mg-Zn-Ca alloy obtained by double extrusion followed by annealing at 673K for 2h possessed a fracture strain over 0.40. The biocompatibility of the alloy was confirmed here by investigating its degradation behavior and the response of extraperitoneal tissue around the Mg-Zn-Ca alloy. Small gas cavity due to degradation was observed following implantation of the developed Mg-Zn-Ca clip by in vivo micro-CT. Histological analysis, minimal observed inflammation, and an only small decrease in the volume of the implanted Mg-Zn-Ca clip confirmed its excellent biocompatibility. FEA using the material data for ductile Mg-Zn-Ca also showed that the clip could occlude the simulated vessel without fracture. In addition, the Mg-Zn-Ca alloy clip successfully occluded the renal vein. Microstructural observations using electron backscattering diffraction confirmed that dynamic recovery occurred during the later stage of plastic deformation of the ductile Mg-Zn-Ca alloy. These results suggest that the developed Mg-Zn-Ca alloy is a suitable material for biodegradable clips. STATEMENT OF SIGNIFICANCE Since conventional magnesium alloys have not exhibited significant ductility for applying the occlusion of vessels, the alloying of magnesium with essential elements and the control of microstructure by hot extrusion and annealing were conducted. Mechanical characterization revealed that the Mg-Zn-Ca alloy obtained by double extrusion followed by annealing at 673K for 2h possessed a fracture strain over 0.40. The biocompatibility of the alloy was confirmed by investigating its degradation behavior and the response of extraperitoneal tissue around the Mg-Zn-Ca alloy. Finite element analysis using the material data for the ductile Mg-Zn-Ca alloy also showed that the clip could occlude the simulated vessel without fracture. In addition, the Mg-Zn-Ca alloy clip successfully occluded the renal vein. Microstructural observations using electron backscattering diffraction confirmed that dynamic recovery occurred during the later stage of plastic deformation of the ductile Mg-Zn-Ca alloy.
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Affiliation(s)
- Naoko Ikeo
- Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai-cho, Kobe, Hyogo 657-8501, Japan.
| | - Ryota Nakamura
- Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai-cho, Kobe, Hyogo 657-8501, Japan
| | - Kosuke Naka
- Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai-cho, Kobe, Hyogo 657-8501, Japan
| | - Toshiaki Hashimoto
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Toshihiko Yoshida
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Takeshi Urade
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Kenji Fukushima
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Hikaru Yabuuchi
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Takumi Fukumoto
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Yonson Ku
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Toshiji Mukai
- Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai-cho, Kobe, Hyogo 657-8501, Japan.
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Hara S, Kobayashi M, Kuriiwa F, Mukai T, Mizukami H. Different mechanisms of hydroxyl radical production susceptible to purine P2 receptor antagonists between carbon monoxide poisoning and exogenous ATP in rat striatum. Free Radic Res 2014; 48:1322-33. [PMID: 25096805 DOI: 10.3109/10715762.2014.951842] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Previous studies have suggested that carbon monoxide (CO) poisoning stimulates cAMP production via purine P2Y11-like receptors in the rat striatum, activating cAMP signaling pathways, resulting in hydroxyl radical ((•)OH) production. Extracellular ATP was thought likely to trigger the cascade, but the present study has failed to demonstrate a clear increase in the extracellular ATP due to CO poisoning. The CO-induced (•)OH production was attenuated by the P2Y11 receptor antagonist NF157, in parallel with its abilities to suppress the CO-induced cAMP production. The (•)OH production was more strongly suppressed by a non-selective P2 receptor antagonist, PPADS, which had no effect on cAMP production. More selective antagonists toward the respective P2 receptors susceptible to PPADS, including NF279, had little or no effect on the CO-induced (•)OH production. The intrastriatal administration of exogenous ATP dose-dependently stimulated (•)OH production, which was dose-dependently antagonized by PPADS and NF279 but not by NF157. Exogenous GTP and CTP dose-dependently stimulated (•)OH production, though less potently. The GTP-induced (•)OH production was susceptible to both of NF279 and PPADS, but the CTP-induced (•)OH production was resistant to PPADS. The mechanism of (•)OH production may differ between CO poisoning and exogenous ATP, while multiple P2 receptors could participate in (•)OH production. The CO-induced (•)OH production was susceptible to the inhibition of NADPH oxidase, but not xanthine oxidase. Also, the NADPH oxidase inhibition suppressed (•)OH production induced by forskolin, a stimulator of intracellular cAMP formation. It is likely that (•)OH is produced by NADPH oxidase activation via cAMP signaling pathways during CO poisoning.
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Affiliation(s)
- S Hara
- Department of Forensic Medicine, Tokyo Medical University , Tokyo , Japan
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Ohtsuka Y, Higashimoto K, Sasaki K, Jozaki K, Yoshinaga H, Okamoto N, Takama Y, Kubota A, Nakayama M, Yatsuki H, Nishioka K, Joh K, Mukai T, Yoshiura KI, Soejima H. Autosomal recessive cystinuria caused by genome-wide paternal uniparental isodisomy in a patient with Beckwith-Wiedemann syndrome. Clin Genet 2014; 88:261-6. [PMID: 25171146 DOI: 10.1111/cge.12496] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 08/25/2014] [Accepted: 08/27/2014] [Indexed: 01/08/2023]
Abstract
Approximately 20% of Beckwith-Wiedemann syndrome (BWS) cases are caused by mosaic paternal uniparental disomy of chromosome 11 (pUPD11). Although pUPD11 is usually limited to the short arm of chromosome 11, a small minority of BWS cases show genome-wide mosaic pUPD (GWpUPD). These patients show variable clinical features depending on mosaic ratio, imprinting status of other chromosomes, and paternally inherited recessive mutations. To date, there have been no reports of a mosaic GWpUPD patient with an autosomal recessive disease caused by a paternally inherited recessive mutation. Here, we describe a patient concurrently showing the clinical features of BWS and autosomal recessive cystinuria. Genetic analyses revealed that the patient has mosaic GWpUPD and an inherited paternal homozygous mutation in SLC7A9. This is the first report indicating that a paternally inherited recessive mutation can cause an autosomal recessive disease in cases of GWpUPD mosaicism. Investigation into recessive mutations and the dysregulation of imprinting domains is critical in understanding precise clinical conditions of patients with mosaic GWpUPD.
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Affiliation(s)
- Y Ohtsuka
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
| | - K Higashimoto
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
| | - K Sasaki
- Department of Human Genetics, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - K Jozaki
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
| | - H Yoshinaga
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
| | - N Okamoto
- Department of Medical Genetics, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan
| | - Y Takama
- Department of Pediatric Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan
| | - A Kubota
- Department of Pediatric Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan
| | - M Nakayama
- Department of Pathology, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan
| | - H Yatsuki
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
| | - K Nishioka
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
| | - K Joh
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
| | - T Mukai
- Nishikyushu University, Saga, Japan
| | - K-i Yoshiura
- Department of Human Genetics, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - H Soejima
- Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medicine, Saga University, Saga, Japan
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Abstract
InGaN quantum-well-structure blue LEDs were grown on epitaxially laterally overgrown GaN (ELOG) and sapphire substrates. The output power of both LEDs was as high as 6 mW at a current of 20 mA. The LED on sapphire had a considerable amount of leakage current in comparison with that on ELOG. These results indicate that In composition fluctuation is not caused by threading dislocations (TDs), free carriers are captured by radiative recombination centers before they are captured by nonradiative recombination centers in InGaN, and that the dislocations form the leakage current pathway in InGaN. Red LED with an emission peak wavelength of 650 nm was fabricated by increasing the In composition and thickness of InGaN well layer. When the laser diodes (LD) was formed on the GaN layer above the SiO2 mask region, the threshold current density was as low as 3 kAcm−2. When the LD was formed on the window region, the threshold current density was as high as 6 to 9 kAcm−2. There is a possibility that a leakage current due to a large number of TDs caused the high threshold current density on the window region. InGaN multi-quantum-well (MQW) structure LDs grown on the ELOG substrate showed an output power as high as 420 mW under RT-CW operation. The longest lifetime of 9,800 hours at a constant output power of 2 mW was achieved. The InGaN MQW LDs were fabricated on a GaN substrate. The fundamental transverse mode was observed up to an output power of 80 mW.
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Kanno S, Hirano S, Chiba S, Takeshita H, Nagai T, Takada M, Sakamoto K, Mukai T. The role of Rho-kinases in IL-1β release through phagocytosis of fibrous particles in human monocytes. Arch Toxicol 2014; 89:73-85. [DOI: 10.1007/s00204-014-1238-2] [Citation(s) in RCA: 23] [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] [Received: 01/06/2014] [Accepted: 04/01/2014] [Indexed: 12/11/2022]
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Doi S, Yasuda I, Kawakami H, Hayashi T, Hisai H, Irisawa A, Mukai T, Katanuma A, Kubota K, Ohnishi T, Ryozawa S, Hara K, Itoi T, Hanada K, Yamao K. Endoscopic ultrasound-guided celiac ganglia neurolysis vs. celiac plexus neurolysis: a randomized multicenter trial. Endoscopy 2014; 45:362-9. [PMID: 23616126 DOI: 10.1055/s-0032-1326225] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [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: 02/07/2023]
Abstract
BACKGROUND AND STUDY AIMS No prospective comparison of endoscopic ultrasonography-guided direct celiac ganglia neurolysis (EUS - CGN) vs. EUS-guided celiac plexus neurolysis (EUS - CPN) has been reported. The aim of the current study was to compare the effectiveness of EUS - CGN and EUS - CPN in providing pain relief from upper abdominal cancer pain in a multicenter randomized controlled trial. PATIENTS AND METHODS Patients with upper abdominal cancer pain were randomly assigned to treatment using either EUS - CGN or EUS - CPN. Evaluation was performed at Day 7 postoperatively using a pain scale of 0 to 10. Patients for whom pain decreased to ≤ 3 were considered to have a positive response, and those experiencing a decrease in pain to ≤ 1 were considered to be completely responsive. Comparison between the two groups was performed using intention-to-treat analysis. The primary endpoint was the difference in treatment response rates between EUS - CGN and EUS - CPN at postoperative Day 7. Secondary endpoints included differences in complete response rates, pain scores, duration of pain relief, and incidence of adverse effects. RESULTS A total of 34 patients were assigned to each group. Visualization of ganglia was possible in 30 cases (88 %) in the EUS - CGN group. The positive response rate was significantly higher in the EUS - CGN group (73.5 %) than in the EUS - CPN group (45.5 %; P = 0.026). The complete response rate was also significantly higher in the EUS - CGN group (50.0 %) than in the EUS - CPN group (18.2 %; P = 0.010). There was no difference in adverse events or duration of pain relief between the two groups. CONCLUSIONS EUS - CGN is significantly superior to conventional EUS - CPN in cancer pain relief. CLINICAL TRIAL REGISTRATION http://www.umin.ac.jp/ctr/index.htm (ID: UMIN-000002536).
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Affiliation(s)
- S Doi
- First Department of Internal Medicine, Gifu University Hospital, Gifu 501-1194, Japan
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Takeshita H, Nagai T, Sagi M, Chiba S, Kanno S, Takada M, Mukai T. Forensic identification using multiple lot numbers of an implanted device. Med Sci Law 2014; 54:51-53. [PMID: 24052003 DOI: 10.1177/0025802413498860] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report a case in which identification of a deceased individual was established using multiple lot numbers printed on a body implantable device. Autopsy of an unknown woman revealed an intramedullary nail inserted within her right femur. The device manufacturer was identified from the configuration of the intramedullary nail, and the "use history" was traced from lot numbers printed on the device's multiple parts. The deceased individual was thus identified as a woman who had attempted suicide by jumping from a height about a year previously and had been transported to a hospital and undergone surgery that included implantation of the intramedullary nail. The main factor contributing to the rapid identification was the manufacturer's and distributor's record of the use history (traceability) of the product, because of their accountability for purposes of quality control. A second contributing factor was multiple lot numbers, resulting in extremely low probability of the same combination of lot numbers being present in multiple individuals. This case confirmed the utility of multiple lot numbers of body implantable devices in forensic identification.
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Affiliation(s)
- H Takeshita
- Department of Legal Medicine, St. Marianna University School of Medicine, Japan
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Mukai T, Tsukui S, Yoshida K, Yamaguchi S, Hatayama R, Adachi M, Ishibashi H, Kakehi Y, Satoh K, Kusaka T, Goretta KC. Fabrication of Y 2O 3-Doped Zirconia/Gadolinia-Doped Ceria Bilayer Electrolyte Thin Film SOFC Cells of SOFCs by Single-Pulsed Laser Deposition Processing. J Fuel Cell Sci Technol 2013; 10. [PMCID: PMC3994766 DOI: 10.1115/1.4025064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 07/08/2013] [Indexed: 06/18/2023]
Abstract
An 8 -mol. % Y2O3-doped zirconia/10-mol. % GdO2-doped ceria (YSZ/GDC) bilayer electrolyte and a Gd0.5Sr0.5CoO3 (GSCO) cathode were deposited by a single-processing, pulsed laser deposition (PLD) method to fabricate anode support cells. No additional heat treatment was needed. Laser frequencies of 10, 20, and 100 Hz were used to deposit bilayer electrolytes between the NiO–YSZ (NiO:YSZ = 60:40 wt. %) anode substrate and the GSCO cathode thin film. The GDC thin film produced at 10 Hz was smooth, well-crystallized, and highly dense. The crystallinity of the GSCO cathode on the GDC was also improved. We concluded the GDC crystallinity affected the crystallinity of the cathode thin film. The resistivity of the YSZ single layer (5.7 μm thickness) was 1.4 times higher than that of the YSZ/GDC bilayer (YSZ 3.0 μm thickness, GDC 2.7 μm thickness) at 600 °C and that of the YSZ-GDC interface became low. The optimum YSZ thickness was found to be approximately 3.0 μm, at which thickness there was effective blocking of the passage of hydrogen molecules and electrons. A cell with a YSZ (3.0 μm thickness, fabricated at 20 Hz)/GDC (5.0 μm thickness, fabricated at 10 Hz) bilayer and GSCO cathode thin film exhibited a maximum power density of 400 mW·cm–2 at a comparatively low temperature of 600 °C.
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Affiliation(s)
| | - S. Tsukui
- Department of Chemical Engineering,Osaka Prefecture University,1-1, Gakuen-cho, Naka-ku, Sakai,Osaka 599-8531, Japan
| | - K. Yoshida
- Division of General Education,Tokyo Metropolitan College ofIndustrial Technology,8-17-1, Minamisennju, Arakawa-ku,Tokyo 116-0003, Japan
| | | | | | - M. Adachi
- Department of Chemical Engineering,Osaka Prefecture University,1-1, Gakuen-cho, Naka-ku, Sakai,Osaka 599-8531, Japan
| | - H. Ishibashi
- Department of Physical Science,Osaka Prefecture University,1-1, Gakuen-cho, Naka-ku, Sakai,Osaka 599-8531, Japan
| | | | | | - T. Kusaka
- Technology Research Institute ofOsaka Prefecture,2-7-1, Ayumino, Izumi-si,Osaka 594-1157, Japan
| | - K. C. Goretta
- International Office,Air Force Office of Scientific Research,Arlington, VA 22203-1768
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Yasuda I, Nakashima M, Iwai T, Isayama H, Itoi T, Hisai H, Inoue H, Kato H, Kanno A, Kubota K, Irisawa A, Igarashi H, Okabe Y, Kitano M, Kawakami H, Hayashi T, Mukai T, Sata N, Kida M, Shimosegawa T. Japanese multicenter experience of endoscopic necrosectomy for infected walled-off pancreatic necrosis: The JENIPaN study. Endoscopy 2013; 45:627-34. [PMID: 23807806 DOI: 10.1055/s-0033-1344027] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [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: 02/07/2023]
Abstract
BACKGROUND AND STUDY AIMS Only a few large cohort studies have evaluated the efficacy and safety of endoscopic necrosectomy for infected walled-off pancreatic necrosis (WOPN). Therefore, a multicenter, large cohort study was conducted to evaluate the efficacy and safety of endoscopic necrosectomy and to examine the procedural details and follow-up after successful endoscopic necrosectomy. PATIENTS AND METHODS A retrospective review was conducted in 16 leading Japanese institutions for patients who underwent endoscopic necrosectomy for infected WOPN between August 2005 and July 2011. The follow-up data were also reviewed to determine the long-term outcomes of the procedures. RESULTS Of 57 patients, 43 (75 %) experienced successful resolution after a median of 5 sessions of endoscopic necrosectomy and 21 days of treatment. Complications occurred in 19 patients (33 %) during the treatment period. Six patients died (11 %): two due to multiple organ failure and one patient each from air embolism, splenic aneurysm, hemorrhage from a Mallory - Weiss tear, and an unknown cause. Of 43 patients with successful endoscopic necrosectomy, recurrent cavity formation was observed in three patients during a median follow-up period of 27 months. CONCLUSIONS Endoscopic necrosectomy can be an effective technique for infected WOPN and requires a relatively short treatment period. However, serious complications can arise, including death. Therefore, patients should be carefully selected, and knowledgeable, skilled, and experienced operators should perform the procedure. Further research into safer technologies is required in order to reduce the associated morbidity and mortality.
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Affiliation(s)
- I Yasuda
- First Department of Internal Medicine, Gifu University Hospital, Gifu 501-1194, Japan.
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Yasuda I, Nakashima M, Iwai T, Isayama H, Itoi T, Hisai H, Inoue H, Kato H, Kanno A, Kubota K, Irisawa A, Igarashi H, Okabe Y, Kitano M, Kawakami H, Hayashi T, Mukai T, Sata N, Kida M, Shimosegawa T. Japanese multicenter experience of endoscopic necrosectomy for infected walled-off pancreatic necrosis: The JENIPaN study. Endoscopy 2013. [PMID: 23807806 DOI: 10.1055/s-0033-1344027,] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND STUDY AIMS Only a few large cohort studies have evaluated the efficacy and safety of endoscopic necrosectomy for infected walled-off pancreatic necrosis (WOPN). Therefore, a multicenter, large cohort study was conducted to evaluate the efficacy and safety of endoscopic necrosectomy and to examine the procedural details and follow-up after successful endoscopic necrosectomy. PATIENTS AND METHODS A retrospective review was conducted in 16 leading Japanese institutions for patients who underwent endoscopic necrosectomy for infected WOPN between August 2005 and July 2011. The follow-up data were also reviewed to determine the long-term outcomes of the procedures. RESULTS Of 57 patients, 43 (75 %) experienced successful resolution after a median of 5 sessions of endoscopic necrosectomy and 21 days of treatment. Complications occurred in 19 patients (33 %) during the treatment period. Six patients died (11 %): two due to multiple organ failure and one patient each from air embolism, splenic aneurysm, hemorrhage from a Mallory - Weiss tear, and an unknown cause. Of 43 patients with successful endoscopic necrosectomy, recurrent cavity formation was observed in three patients during a median follow-up period of 27 months. CONCLUSIONS Endoscopic necrosectomy can be an effective technique for infected WOPN and requires a relatively short treatment period. However, serious complications can arise, including death. Therefore, patients should be carefully selected, and knowledgeable, skilled, and experienced operators should perform the procedure. Further research into safer technologies is required in order to reduce the associated morbidity and mortality.
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Affiliation(s)
- I Yasuda
- First Department of Internal Medicine, Gifu University Hospital, Gifu 501-1194, Japan.
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Chiba S, Ikawa T, Takeshita H, Kanno S, Nagai T, Takada M, Mukai T, Wempe MF. Human organic cation transporter 2 (hOCT2): Inhibitor studies using S2-hOCT2 cells. Toxicology 2013; 310:98-103. [PMID: 23770354 DOI: 10.1016/j.tox.2013.06.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 06/04/2013] [Accepted: 06/04/2013] [Indexed: 01/11/2023]
Abstract
Highly expressed in kidney and located on the basolateral membrane, human organic cation transporter 2 (hOCT2) can transport various compounds (i.e. drugs and toxins) into the proximal tubular cell. Using cultured proximal tubule cells stably expressing hOCT2 (i.e. S2-hOCT2 cells), we sought to probe different compound classes (e.g. analgesics, anti-depressants, anti-psychotics, disinfectant, herbicides, insecticides, local anesthetic, muscarinic acetylcholine receptor antagonist, sedatives, steroid hormone, stimulants and toxins) for their ability to inhibit (14)C-TEA uptake, a prototypical OCT2 substrate. Aconitine, amitriptyline, atropine, chlorpyrifos, diazepam, fenitrothion, haloperidol, lidocaine, malathion, mianserin, nicotine and triazolam significantly inhibited (14)C-TEA uptake; IC50 values were 59.2, 2.4, 2.0, 20.7, 32.3, 13.2, 32.5, 104.6, 71.1, 17.7, 52.8 and 65.5μM, respectively. In addition, aconitine, amitriptyline, atropine, chlorpyrifos, fenitrothion, haloperidol, lidocaine, and nicotine displayed competitive inhibition with Ki values of 145.6, 2.5, 2.4, 24.8, 16.9, 51.6, 86.8 and 57.7μM, respectively. These in vitro data support the notion that compounds pertaining to a wide variety of different drug classes have the potential to decrease renal clearance of drugs transported via hOCT2. Consequently, these data warrant additional studies to probe hOCT2 and its role to influence drug pharmacokinetics.
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Affiliation(s)
- Shoetsu Chiba
- Department of Legal Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki 216-8511, Japan.
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Mukai T, Yamamoto T, Machida S. Dynamics and Kinetic Properties of Plasmoids and Flux Ropes: GEOTAIL Observations. New Perspectives on the Earth's Magnetotail 2013. [DOI: 10.1029/gm105p0117] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Kanno S, Hirano S, Sagi M, Chiba S, Takeshita H, Ikawa T, Ichiba K, Nagai T, Takada M, Sakamoto K, Mukai T. Sulfide induces apoptosis and Rho kinase-dependent cell blebbing in Jurkat cells. Arch Toxicol 2013; 87:1245-56. [PMID: 23479079 DOI: 10.1007/s00204-013-1027-3] [Citation(s) in RCA: 8] [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] [Received: 11/25/2012] [Accepted: 02/25/2013] [Indexed: 01/15/2023]
Abstract
Hydrogen sulfide (H₂S) is a toxic gaseous substance, and accidental exposure to high concentrations of H₂S has been reported to be lethal to humans. Inhaled and absorbed H₂S is partially dissolved within the circulation and causes toxic effects on lymphocytes. However, the mechanisms involved in H₂S toxicity have not been well documented. In this study, we examined the cellular uptake and injury of sulfide-exposed human T lymphocytes (Jurkat). Cells were exposed to a H₂S donor, sodium hydroxysulfide (NaHS), at pH 6.0, 7.0, or 8.0 for 1 h at 37 °C in a sealed conical tube to avoid the loss of dissolved H₂S gas. Cytotoxicity and cellular sulfide concentrations increased dramatically as the pH of the NaHS solution decreased. Sulfide enhanced the cleavage of caspase-3 and poly (ADP-ribose) polymerase and induced early cellular apoptosis. A pan-caspase inhibitor reduced sulfide-induced apoptosis. These results indicate that sulfide induces pH-dependent and caspase-dependent apoptosis. We also found that blebbing of the plasma membrane occurred in sulfide-exposed cells. Both ROCK-1 and ROCK-2 (Rho kinases) were activated by sulfide, and sulfide-induced cell blebbing was suppressed by a ROCK inhibitor, suggesting that a Rho pathway is involved in sulfide-induced blebbing in lymphocytes.
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Affiliation(s)
- Sanae Kanno
- Department of Legal Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki 216-8511, Japan.
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Arihara K, Nakashima Y, Mukai T, Ishikawa S, Itoh M. Peptide inhibitors for angiotensin I-converting enzyme from enzymatic hydrolysates of porcine skeletal muscle proteins. Meat Sci 2012; 57:319-24. [PMID: 22061507 DOI: 10.1016/s0309-1740(00)00108-x] [Citation(s) in RCA: 158] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2000] [Revised: 08/18/2000] [Accepted: 08/18/2000] [Indexed: 11/16/2022]
Abstract
Inhibitors of angiotensin I-converting enzyme (ACE) have been shown to have antihypertensive effects and have been utilized for pharmaceuticals and physiologically functional foods. In the present study, efforts were directed to find ACE inhibitory activities derived from muscle proteins. Porcine skeletal muscle proteins were hydrolyzed by eight proteases, and the inhibitory activities of the hydrolysates toward ACE were measured. Among the digests of the water-insoluble protein fraction prepared from muscle, thermolysin digest demonstrated the highest activity. Also, among hydrolysates of porcine myosin produced by the same enzymes, thermolysin digest showed the most potent inhibitory activity. Two ACE inhibitory peptides were purified from thermolysin digest of myosin. The sequences of these inhibitory peptides, named myopentapeptides A and B, were Met-Asn-Pro-Pro-Lys and Ile-Thr-Thr-Asn-Pro. These sequences were found in the primary structure of the myosin heavy chain. The concentrations of the peptides showing 50% inhibition values (IC(50)) of ACE were 945.5 and 549.0 μM, respectively. Also, six tripeptides, Met-Asn-Pro, Asn-Pro-Pro, Pro-Pro-Lys, Ile-Thr-Thr, Thr-Thr-Asn, and Thr-Asn-Pro, which have parts of the sequences of the myopentapeptides, demonstrated activity. Their IC(50) values were 66.6, 290.5, >1000, 678.2, 672.7, and 207.4 μM, respectively.
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Affiliation(s)
- K Arihara
- Faculty of Animal Science, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada-shi 034-8628, Japan
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Yao J, Nishimura K, Mukai T, Takasaki T, Tsutsumi K, Aguey-Zinsou KF, Sakai T. LiMn0.97Al0.03O2 Based Carbon Fiber Electrode Possessing High Rate Capabilities for Li-Ion Batteries. ACTA ACUST UNITED AC 2012. [DOI: 10.1149/2.009206eel] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Mukai T, Ogawa K, Arano Y, Ono M, Fujioka Y, Izumo M, Konishi J, Saji H. Synthesis and evaluation of bisphosphonate derivative labeled with rhenium-186 using monoaminemonoamide-dithiols as a chelating group. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.25804401218] [Citation(s) in RCA: 1] [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: 11/05/2022]
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Hara S, Kobayashi M, Kuriiwa F, Mukai T, Mizukami H. Dual contradictory roles of cAMP signaling pathways in hydroxyl radical production in the rat striatum. Free Radic Biol Med 2012; 52:1086-92. [PMID: 22269608 DOI: 10.1016/j.freeradbiomed.2012.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [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] [Received: 10/05/2011] [Revised: 12/19/2011] [Accepted: 01/03/2012] [Indexed: 10/14/2022]
Abstract
Studies have suggested that cAMP signaling pathways may be associated with the production of reactive oxygen species. In this study, we examined how modifications in cAMP signaling affected the production of hydroxyl radicals in rat striatum using microdialysis to measure extracellular 2,3-dihydroxybenzoic acid (2,3-DHBA), which is a hydroxyl radical adduct of salicylate. Up to 50 nmol of the cell-permeative cAMP mimetic 8-bromo-cAMP (8-Br-cAMP) increased 2,3-DHBA in a dose-dependent manner (there was no additional increase in 2,3-DHBA at 100 nmol). Another cAMP mimetic, dibutyryl cAMP (db-cAMP), caused a nonsignificant increase in 2,3-DHBA at 50 nmol and a significant decrease at 100 nmol. Up to 20 nmol of forskolin, which is a direct activator of adenylyl cyclase, increased 2,3-DHBA, similar to the effect of 8-Br-cAMP; however, forskolin resulted in a much greater increase in 2,3-DHBA. A potent inhibitor of protein kinase A (PKA), H89 (500 μM), potentiated the 8-Br-cAMP- and forskolin-induced increases in 2,3-DHBA and antagonized the inhibitory effect of 100 nmol of db-cAMP. Interestingly, the administration of 100 nmol of 8-bromo-cGMP alone or in combination with H89 had no significant effect on 2,3-DHBA levels. Doses of 100 nmol of a preferential PKA activator (6-phenyl-cAMP) or a preferential PKA inhibitor (8-bromoadenosine-3',5'-cyclic monophosphorothionate, Rp-isomer; Rp-8-Br-cAMPS), which also inhibits the cAMP-mediated activation of Epac (the exchange protein directly activated by cAMP), suppressed or enhanced, respectively, the formation of 2,3-DHBA. Up to 100 nmol of 8-(4-chlorophenylthio)-2'-O-methyladenosine-cAMP, which is a selective activator of Epac, dose-dependently stimulated the formation of 2,3-DHBA. These findings suggest that cAMP signaling plays contradictory roles (stimulation and inhibition) in the production of hydroxyl radicals in rat striatum by differential actions of Epac and PKA. These roles might contribute to the production of hydroxyl radicals concomitant with cAMP in carbon monoxide poisoning, because the formation of 2,3-DHBA was potentiated by the PKA inhibitor H89 and suppressed by Rp-8-Br-cAMPS, which inhibits PKA and Epac.
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Affiliation(s)
- Shuichi Hara
- Department of Forensic Medicine, Tokyo Medical University, Tokyo 160-8402, Japan.
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Doi S, Yasuda I, Nakashima M, Iwashita T, Toda K, Mukai T, Iwata K, Itoi T, Moriwaki H. Carbon dioxide insufflation vs. conventional saline irrigation for peroral video cholangioscopy. Endoscopy 2011; 43:1070-5. [PMID: 21971925 DOI: 10.1055/s-0030-1256764] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [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: 12/10/2022]
Abstract
BACKGROUND AND STUDY AIMS Recent studies have evaluated the efficacy of peroral cholangioscopy (POCS) for diagnosis of biliary diseases. In order to obtain clear images with POCS, saline irrigation, which is performed to replace yellow bile, is carried out for an extended duration. The aim of this study was to evaluate the feasibility of replacing saline irrigation with CO₂ insufflation during POCS. PATIENTS AND METHODS A total of 36 patients who had bile duct lesions and were due to undergo POCS were enrolled in the study. Of these patients, 18 underwent POCS using saline irrigation followed by CO₂ insufflation, and 18 patients underwent the reverse approach. The two methods were compared with regard to the time required to obtain a clear endoscopic image and the quality of the images. RESULTS The median time required to obtain a clear endoscopic image using CO₂ insufflation (5.0 min) was significantly shorter than that required for saline irrigation (22.5 min; P < 0.001). The quality of the endoscopic images obtained was similar in 27 cases. However, CO₂ insufflation provided better images in four cases that showed an abundance of mucin or biliary sludge, and saline irrigation was superior to CO₂ insufflation in five cases that showed severe stricture with bleeding and tall papillary lesions. CONCLUSIONS CO₂ insufflation during POCS can reduce procedure time and simplify cholangioscopy. The overall image quality was similar to that obtained with conventional saline irrigation.
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Affiliation(s)
- S Doi
- First Department of Internal Medicine, Gifu University Hospital, Gifu, Japan
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