1
|
Sakae Y, Takada H, Ichinose S, Nakajima M, Sakai A, Ogawa R. Treatment with YIGSR peptide ameliorates mouse tail lymphedema by 67 kDa laminin receptor (67LR)-dependent cell-cell adhesion. Biochem Biophys Rep 2023; 35:101514. [PMID: 37521371 PMCID: PMC10372372 DOI: 10.1016/j.bbrep.2023.101514] [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] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 07/06/2023] [Accepted: 07/11/2023] [Indexed: 08/01/2023] Open
Abstract
Impaired microcirculation can cause lymphatic leakage which leads to a chronic swelling in the tissues of the body. However, no successful treatment gives any protection against lymphedema due to the lack of well-revealed pathophysiology of secondary lymphedema. Binary image of laminin immunohistochemical expression revealed that distribution of laminin expression localized during surgically induced lymphedema. 67 kDa laminin receptor (67LR) mRNA expression showed a peak at during lymphedema exacerbation. Since the response of 67LR molecules may affect the prevention of inflammation and edema, here we have hypothesized that 67LR ligand of YIGSR peptide could permit reconstructive environment for amelioration of lymphedema and evaluated the effect of YIGSR in a mouse tail model of lymphedema. Indeed, intra-abdominal injections of YIGSR for the first 3 days after inducing lymphedema in the mouse tail model reduced the tail lymphedema on day 14 by 27% (P = 0.035). Histology showed that YIGSR treatment protected lymphedema impairment in epidermis and dermis, and it also inhibited the expansion of intercellular spaces and enhanced especially cell adhesion in the basement membrane as revealed by transmission electron microscopy. Interestingly, the treatment also reduced the local expression of transforming growth factor (TGF)β. Further elucidation of the mechanisms of 67LR-facilitated lymphangiogenesis contributes to find potential targets for the treatment of lymphedema.
Collapse
Affiliation(s)
- Y. Sakae
- Department of Plastic, Reconstructive and Aesthetic Surgery, Nippon Medical School, Japan
| | - H. Takada
- Department of Plastic, Reconstructive and Aesthetic Surgery, Nippon Medical School, Japan
- Department of Anti-Aging and Preventive Medicine, Nippon Medical School, Japan
| | - S. Ichinose
- Department of Plastic, Reconstructive and Aesthetic Surgery, Nippon Medical School, Japan
| | - M. Nakajima
- Department of Pharmacology, Nippon Medical School, Japan
| | - A. Sakai
- Department of Pharmacology, Nippon Medical School, Japan
| | - R. Ogawa
- Department of Plastic, Reconstructive and Aesthetic Surgery, Nippon Medical School, Japan
- Department of Anti-Aging and Preventive Medicine, Nippon Medical School, Japan
| |
Collapse
|
2
|
Saito Y, Oka S, Tamai N, Kudo T, Kuniyoshi N, Shirakura T, Omae Y, Hamahata Y, Arai T, Tanaka S, Uedo N, Shimizu S, Fukuzawa M, Uraoka T, Ichinose S, Ogata H, Kobayashi K, Saito S, Tajiri H. Efficacy and safety of oral sulfate solution for bowel preparation in Japanese patients undergoing colonoscopy: Noninferiority-based, randomized, controlled study. Dig Endosc 2021; 33:1131-1138. [PMID: 33476415 PMCID: PMC8596579 DOI: 10.1111/den.13930] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 01/18/2021] [Indexed: 12/15/2022]
Abstract
OBJECTIVES To compare the efficacy and safety of oral sulfate solution administered using the same-day dose and the split-dose regimens with those of polyethylene glycol plus ascorbate solution, used for bowel preparation in Japanese patients undergoing colonoscopy. METHODS This multicenter (n = 13), randomized, active-controlled, colonoscopist- and image evaluator-blinded, noninferiority study with parallel-group comparison recruited 632 patients from December 2018 to June 2019. Of these, 602 patients were divided into the oral sulfate solution same-day dose group (n = 200); oral sulfate solution split-dose group (n = 202); and polyethylene glycol plus ascorbate same-day dose group (n = 200). Differences in the efficacy rates between the polyethylene glycol plus ascorbate group and each oral sulfate solution group were calculated using the asymptotic method. The safety of the oral sulfate solution was evaluated, based on the occurrence of adverse events and reactions. RESULTS Both oral sulfate solution protocols were confirmed as noninferior to the polyethylene glycol plus ascorbate protocol for bowel-cleansing. The occurrence of adverse reactions was significantly lower in the oral sulfate solution same-day dose group than in the polyethylene glycol plus ascorbate group (P = 0.010). The occurrence of adverse reactions was not significantly different between the oral sulfate solution split-dose and the polyethylene glycol plus ascorbate group. CONCLUSIONS Oral sulfate solution is not only safe and efficacious but also not inferior to polyethylene glycol plus ascorbate solution (active control). It could be used for bowel preparation in Japanese patients scheduled for colonoscopy (Clinical trial registration number: NCT03794310).
Collapse
Affiliation(s)
- Yutaka Saito
- Endoscopy DivisionNational Cancer Center HospitalTokyoJapan
| | - Shiro Oka
- Department ofGastroenterology and MetabolismHiroshima University HospitalHiroshimaJapan
| | | | - Toyoki Kudo
- Digestive Disease CenterShowa University Northern Yokohama HospitalKanagawaJapan
| | | | | | - Yoshio Omae
- Department of GastroenterologyKawasaki Saiwai HospitalKanagawaJapan
| | - Yukihiro Hamahata
- Department of ColoproctologyTsujinaka Hospital KashiwanohaChibaJapan
| | - Takehiro Arai
- Gastroenterology DivisionTokatsu‐Tsujinaka HospitalChibaJapan
| | - Shinji Tanaka
- Department ofEndoscopyHiroshima University HospitalHiroshimaJapan
| | - Noriya Uedo
- Department of Gastrointestinal OncologyOsaka International Cancer InstituteOsakaJapan
| | - Seiji Shimizu
- Departments of Gastroenterology and HepatologyOsaka General Hospital of West Japan Railway CompanyOsakaJapan
| | - Masakatsu Fukuzawa
- Department of Gastroenterology and HepatologyTokyo Medical UniversityTokyoJapan
| | - Toshio Uraoka
- Department of Gastroenterology and HepatologyGunma University Graduate School of MedicineGunmaJapan
| | | | - Haruhiko Ogata
- Center for Diagnostic and Therapeutic EndoscopyKeio University School of MedicineTokyoJapan
| | - Kiyonori Kobayashi
- Research and Development Center for New Medical FrontiersKitasato University School of MedicineKanagawaJapan
| | - Shoichi Saito
- Department of GastroenterologyThe Cancer Institute Hospital of Japanese Foundation for Cancer ResearchTokyoJapan
| | - Hisao Tajiri
- Department ofInnovative Interventional Endoscopy ResearchThe Jikei University School of MedicineTokyoJapan
| |
Collapse
|
3
|
Matsumura H, Liu N, Nanba D, Ichinose S, Takada A, Kurata S, Morinaga H, Mohri Y, Arcangelis A, Ohno S, Nishimura E. 328 Distinct stem cell division programs determine organ regeneration and aging in hair follicles. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.08.336] [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: 10/20/2022]
|
4
|
Ueno A, Yoshinaga T, Katoh N, Akagawa Y, Tazawa K, Miyazaki D, Ichinose S, Kanaya K, Horiuchi T, Sekijima Y. Clinical features and treatment outcome of patients with dural arteriovenous fistula who were referred to neurology department. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3319] [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]
|
5
|
Abstract
Water emanating from dentinal tubules during air-drying and light-curing of adhesives leads to entrapment of droplets at the resin-dentin interface and contributes to nanoleakage. This study tested the null hypothesis that characteristics of substrate dentin and type of adhesive used for bonding would not affect the occurrence of nanoleakage. Three self-etch adhesives were used to bond to 4 types of dentin with different characteristics in 12 groups. After silver challenge, nanoleakage percentage was measured within the hybrid layer of each sample. The deep dentin cut perpendicular to tubules always showed a significantly higher nanoleakage percentage compared with that of the other 3 types of dentin. The percentages of nanoleakage within the hybrid layers were not statistically different among adhesives. However, when bonding to deep perpendicular dentin, both all-in-one adhesives revealed more distinct nanoleakage within the adhesive layer compared with that achieved with Clearfil SE Bond, a two-step self-etch adhesive. The results did not support the null hypothesis.
Collapse
Affiliation(s)
- Y Yuan
- Department of Cariology and Operative Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | | | | | | | | |
Collapse
|
6
|
Nakagawa Y, Muneta T, Kondo S, Mizuno M, Takakuda K, Ichinose S, Tabuchi T, Koga H, Tsuji K, Sekiya I. Synovial mesenchymal stem cells promote healing after meniscal repair in microminipigs. Osteoarthritis Cartilage 2015; 23:1007-17. [PMID: 25683149 DOI: 10.1016/j.joca.2015.02.008] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [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: 09/23/2014] [Revised: 02/03/2015] [Accepted: 02/05/2015] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The induction of synovial tissue to the meniscal lesion is crucial for meniscal healing. Synovial Mesenchymal stem cells (MSCs) are an attractive cell source because of their high proliferative and chondrogenic potentials. We examined whether transplantation of synovial MSCs promoted healing after meniscal repair of extended longitudinal tear of avascular area in a microminipig model. DESIGN Longitudinal tear lesion was made in medial menisci and sutured in both knees, and then a synovial MSC suspension was administered for 10 min only in unilateral knee. The sutured meniscus was evaluated morphologically and biomechanically at 2, 4, and 12 weeks. The behavior of transplanted MSCs was also examined. RESULTS The meniscal healing at 12 weeks was significantly better in the MSC group than in the control group; macroscopically, histologically and by T1rho mapping analysis. Transmission electron microscopic analysis demonstrated that the meniscus lesion was occupied by dense collagen fibrils only in the MSC group. Biomechanical analysis revealed that the tensile strength to failure of the meniscus higher in the MSC group than in the control group in each microminipig. Synovial tissue covered better along the superficial layer from the outer zone into the lesion of the meniscus in the MSC group at 2 and 4 weeks in each microminipig. Synovial MSCs labeled with ferucarbotran were detected in the meniscus lesion and adjacent synovium by MRI at 2 weeks. CONCLUSION Transplantation of synovial MSCs promoted healing after meniscal repair with induction of synovium into the longitudinal tear in the avascular zone of meniscus in pigs.
Collapse
Affiliation(s)
- Y Nakagawa
- Department of Joint Surgery and Sports Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
| | - T Muneta
- Department of Joint Surgery and Sports Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
| | - S Kondo
- Department of Joint Surgery and Sports Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
| | - M Mizuno
- Center for Stem Cell and Regenerative Medicine, Tokyo Medical and Dental University, Tokyo, Japan.
| | - K Takakuda
- Department of Biodesign, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo, Japan.
| | - S Ichinose
- Research Center for Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
| | | | - H Koga
- Department of Joint Surgery and Sports Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
| | - K Tsuji
- Department of Joint Surgery and Sports Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
| | - I Sekiya
- Center for Stem Cell and Regenerative Medicine, Tokyo Medical and Dental University, Tokyo, Japan.
| |
Collapse
|
7
|
Bolortuya G, Ebihara A, Ichinose S, Watanabe S, Anjo T, Kokuzawa C, Saegusa H, Kawashima N, Suda H. Initial fibroblast attachment to Erbium:YAG laser-irradiated dentine. Int Endod J 2011; 44:1134-44. [PMID: 21851368 DOI: 10.1111/j.1365-2591.2011.01934.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
AIMS To evaluate the effects of Erbium (Er):YAG laser irradiation on the morphology of resected dentine surfaces, and to investigate fibroblast attachment to laser-irradiated dentine surfaces. METHODOLOGY Dentine blocks obtained from single-rooted human teeth were divided into the following groups after sterilization in an autoclave: (i) Laser group treated with Er:YAG laser irradiation (30 mJ per pulse, 10 pps, 60 s); (ii) L-MTAD group treated with laser irradiation as in (i) plus a mixture of doxycycline, tetracycline isomer and citric acid; (iii) RC-Prep group treated with EDTA gel or cream (RC-Prep) and (iv) Control group left untreated. After each treatment, the dentine blocks were incubated with NIH/3T3 fibroblasts cultured to subconfluency in Dulbecco's modified Eagle's medium supplemented with 10% foetal bovine serum and antibiotics. The number of attached cells amongst the groups was analysed statistically at the 5% significance level. The dentine surface morphologies and cell attachments were evaluated by counting assays, histological observations and scanning electron microscopy (SEM). RESULTS The number of attached cells was significantly higher (P < 0.05) in the Laser group than in the RC-Prep and Control groups at 16 h. Dendritic cell extension of the fibroblasts was only observed in the Laser group at 8 h by SEM. In the histological analyses, significantly more attached cells were found on the dentine surfaces treated with laser irradiation. CONCLUSIONS Er:YAG laser irradiation induced morphological alterations in dentine surfaces, which may improve the attachment of fibroblasts to dentine.
Collapse
Affiliation(s)
- G Bolortuya
- Pulp Biology and Endodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Shimaya M, Muneta T, Ichinose S, Tsuji K, Sekiya I. Magnesium enhances adherence and cartilage formation of synovial mesenchymal stem cells through integrins. Osteoarthritis Cartilage 2010; 18:1300-9. [PMID: 20633668 DOI: 10.1016/j.joca.2010.06.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [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] [Received: 12/23/2009] [Revised: 06/05/2010] [Accepted: 06/10/2010] [Indexed: 02/02/2023]
Abstract
OBJECTIVE We previously reported that more than 60% of synovial mesenchymal stem cells (MSCs) placed on osteochondral defects adhered to the defect within 10 min and promoted cartilage regeneration. The efficiency of adherence is considered to depend on the interaction between cells and extracellular matrix (ECM), in which integrins may play some important roles. Divalent cations such as calcium, magnesium, and manganese may affect functions of integrins, and the integrins may be involved in differentiation of MSCs. Among divalent cations, magnesium is used in clinical practice as a therapeutic agent and increases the affinity of integrin to ECM. In this study, we investigated whether magnesium enhanced adherence and chondrogenesis of synovial MSC through integrins. METHODS We performed assays for adherence of human synovial MSCs to collagen-coated slides, in vitro chondrogenesis, ex vivo assays for adherence of human synovial MSCs to osteochondral defect, and in vivo assays for adherence and cartilage formation of synovial MSCs in a rabbit osteochondral defect model. RESULTS Magnesium increased adhesion of human synovial MSCs to collagen, and this effect was inhibited by neutralizing antibodies for integrin α3 and β1. Magnesium also promoted synthesis of cartilage matrix during in vitro chondrogenesis of synovial MSCs, which was diminished by neutralizing antibodies for integrin β1 but not for integrin α3. Ex vivo analyses demonstrated that magnesium enhanced adherence of human synovial MSCs to osteochondral defects. In vivo studies in rabbits showed that magnesium promoted adherence at 1 day and cartilage formation of synovial MSCs at 2 weeks. CONCLUSION Magnesium enhanced adherence of synovial MSCs through integrins, which promoted synthesis of cartilage matrix at an early phase.
Collapse
Affiliation(s)
- M Shimaya
- Section of Orthopedic Surgery, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
| | | | | | | | | |
Collapse
|
9
|
Abstract
BACKGROUND Dentine matrix metalloproteinases (MMPs) may participate in the destruction of dentine following demineralization by bacterial acids. This study investigated the localization of MMPs in carious dentine. METHODS Frozen sections of dentine caries were prepared without demineralization and immersed in monoclonal antibody against MMP-2, -8, -9 and -20. The sections were labelled by IgG conjugated with gold colloidal particles, and observed under FE-SEM. Labelling indexes (number of gold particles/mum(2)) of outer and inner carious dentine, respectively, with and without bacterial infection, were compared with that of normal dentine. RESULTS MMP-2 was distributed in both carious and normal dentine; the level of MMP-2 showed no significant difference among the outer caries, inner caries, and normal dentine. The labelling indexes of MMP-8 and MMP-9 both significantly decreased at the inner carious dentine compared with the level of normal dentine, but intensified again at the outer caries region. The labelling index of MMP-20 was the highest at normal dentine. CONCLUSIONS The localization of MMPs was visibly detected using immunogold labelling. The localization of MMP-2 showed no significant difference among the three regions, while MMP-8 and MMP-9 showed significant reduction at the inner caries layer, and MMP-20 reduced toward the outer caries.
Collapse
Affiliation(s)
- Y Shimada
- Department of Cariology and Operative Dentistry, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan.
| | | | | | | | | |
Collapse
|
10
|
Kunawarote S, Nakajima M, Ichinose S, Tagami J. Mild-acidic HOCl solution as pretreatment for caries-affected dentin: A morphological study. Dent Mater 2010. [DOI: 10.1016/j.dental.2010.08.166] [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: 11/16/2022]
|
11
|
Yamagata K, Ichinose S, Miyashita A, Tagami M. Protective effects of ebselen, a seleno-organic antioxidant on neurodegeneration induced by hypoxia and reperfusion in stroke-prone spontaneously hypertensive rat. Neuroscience 2008; 153:428-35. [DOI: 10.1016/j.neuroscience.2008.02.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 02/04/2008] [Accepted: 02/18/2008] [Indexed: 12/17/2022]
|
12
|
Ohtani K, Usuda J, Ichinose S, Ishizumi T, Hirata T, Inoue T, Maehara S, Imai K, Kubota M, Tsunoda Y, Yamada M, Tsutsui H, Yamada K, Kuroiwa Y, Furukawa K, Okunaka T, Kato H. High expression of GADD-45α and VEGF induced tumor recurrence via upregulation of IL-2 after photodynamic therapy using NPe6. Int J Oncol 2008. [DOI: 10.3892/ijo.32.2.397] [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: 11/06/2022] Open
|
13
|
Ohtani K, Usuda J, Ichinose S, Ishizumi T, Hirata T, Inoue T, Maehara S, Imai K, Kubota M, Tsunoda Y, Yamada M, Tsutsui H, Yamada K, Kuroiwa Y, Furukawa K, Okunaka T, Kato H. High expression of GADD-45alpha and VEGF induced tumor recurrence via upregulation of IL-2 after photodynamic therapy using NPe6. Int J Oncol 2008; 32:397-403. [PMID: 18202762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023] Open
Abstract
NPe6 is a novel second-generation photosensitizer used for photodynamic therapy (PDT). PDT using NPe6 and diode laser (664 nm) induces cell death, inflammatory reactions, immunological responses and damage to the microvasculature. In this study, we evaluated the influence of the immunological responses and of enhanced angiogenesis on the anti-tumor effect of NPe6-PDT using cytokine-overexpressing Lewis lung carcinoma (LLC), LLC-IL-2 cells both in vitro and in vivo. We showed by DNA microarray analysis in vitro that IL-2 and GADD-45alpha (growth arrest and DNA damage 45 alpha) mRNA expressions were induced by 3 h after NPe6-PDT applied at a dose killing 90% of the cells (LD90). IL-2-overexpressing cells (LLC/IL-2 cells) were resistant to the loss of clonogenicity as compared to the parental LLC cells in vitro. Furthermore, in female C57BL/6 mice, NPe6-PDT produced a cure rate of 66.7% in LLC tumors, whereas the cure rate was only 16.6% in LLC/IL-2 tumors, and overexpression of IL-2 caused failure of NPe6-PDT, with tumor recurrence, in vivo. These results suggest that IL-2 expression may play an unfavorable role in attenuation of the antitumor effect of NPe6-PDT. It has been reported that the expression of vascular endothelial growth factor (VEGF), in particular, may cause tumor recurrence after PDT and exert unfavorable effect in relation to attenuate the anti-tumor activity of PDT. Results of immunohistochemical analysis of LLC/IL-2 tumors have revealed that the expressions of GADD-45alpha and VEGF are induced in these tumors after PDT, and in particular, 12 h after PDT, the expression levels were much higher as compared with those in the LLC tumors. The results of our studies using in vitro and in vivo models suggest that the cell death caused by PDT was inhibited by induction of GADD-45alpha expression and that tumor recurrence was promoted by the enhancement of VEGF expression mediated by IL-2 upregulation. Therefore, it is speculated that the use of an IL-2 inhibitor may improve the efficacy of NPe6-PDT.
Collapse
Affiliation(s)
- K Ohtani
- Department of Surgery, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Okunaka T, Usuda J, Ichinose S, Hirata H, Ohtani K, Maehara S, Inoue T, Imai K, Kubota M, Tsunoda Y, Kuroiwa Y, Tsutsui H, Furukawa K, Nishio K, Kato H. A possible relationship between the anti-cancer potency of photodynamic therapy using the novel photosensitizer ATX-s10-Na(II) and expression of the vascular endothelial growth factor in vivo. Oncol Rep 2007; 18:679-83. [PMID: 17671719 DOI: 10.3892/or.18.3.679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
ATX-s10-Na(II) is a novel second-generation photo-sensitizer for photodynamic therapy (PDT). PDT using ATX-s10 and diode laser (670 nm) induces an apoptotic response, inflammatory reaction, immune reaction and damage to the microvasculature. In particular, the vascular shut-down effect plays an important role in the anti-tumor activity of ATX-s10-PDT. It has been reported that PDT induces hypoxia and expression of the vascular endothelial growth factor (VEGF) via the hypoxia-inducible factor 1 (HIF1)-alpha pathway. We hypothesized that the expression of VEGF may cause tumor recurrence after PDT and exert unfavorable effect against the anti-tumor activity of ATX-s10-PDT. In this study, we showed by DNA microarray analysis in vitro that VEGF mRNA expression was induced 3 h after laser irradiation in ATX-s10-PDT. We compared the anti-tumor activity of ATX-s10-PDT against lung cancer cell lines SBC-3 and SBC-3/VEGF, the latter overexpressing VEGF; there was no significant difference in the sensitivity to the PDT between the two cell lines as assessed by clonogenic assay. Furthermore, no statistically significant difference in the anti-tumor effect of PDT, as measured by tumor cures, was found between SBC-3 and SBC-3/VEGF tumors in female Balb/c-nu/nu nude mice in vivo. In conclusion, ATX-s10-PDT may prevent tumor recurrence despite induction of VEGF and promotion of tumor angiogenesis, which are known to enhance tumor proliferation and survival.
Collapse
Affiliation(s)
- T Okunaka
- Respiratory Disease Center, Sanno Hospital, International University of Health and Welfare, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Yuan Y, Shimada Y, Ichinose S, Tagami J. Effect of dentin depth on hybridization quality using different bonding tactics in vivo. J Dent 2007; 35:664-72. [PMID: 17574319 DOI: 10.1016/j.jdent.2007.05.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2007] [Revised: 05/02/2007] [Accepted: 05/03/2007] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVES Incomplete resin infiltration and polymerization of adhesive contributed to nanoleakage formation. This study tested the null hypothesis that adoption of different bonding tactics and dentine depth will not affect hybridization quality in vivo. METHODS Class V cavities were prepared on the labial/buccal surface of monkey teeth. They were bonded by Single Bond (a two-step total-etch adhesive), Clearfil SE Bond (a two-step self-etch adhesive), or Clearfil S(3) Bond (an all-in-one self-etch adhesive). Combined nanoleakage analysis and quantitative immunolabeling evaluation were carried out in the hybrid layer formed in both cervical superficial and deep dentine. RESULTS Single Bond showed reticular and spotted nanoleakage while Clearfil SE Bond and Clearfil S(3) Bond presented only a spotted one. While Single Bond showed increased concentration of labeling of type I collagen within the deep part of the hybrid layer, two self-etch adhesives-Clearfil SE Bond and Clearfil S(3) Bond revealed a homogeneous labeling pattern, even if the latter presented a significantly increased labeling index in deep dentine. CONCLUSIONS Different bonding tactics showed different nanoleakage patterns and immunolabeling index, and was influenced by dentine depth at different levels in vivo.
Collapse
Affiliation(s)
- Y Yuan
- Department of Cariology and Operative Dentistry, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.
| | | | | | | |
Collapse
|
16
|
Usuda J, Ohira T, Suga Y, Oikawa T, Ichinose S, Inoue T, Ohtani K, Maehara S, Imai K, Kubota M, Tsunoda Y, Tsutsui H, Furukawa K, Okunaka T, Sugimoto Y, Kato H. Breast cancer resistance protein (BCRP) affected acquired resistance to gefitinib in a "never-smoked" female patient with advanced non-small cell lung cancer. Lung Cancer 2007; 58:296-9. [PMID: 17618705 DOI: 10.1016/j.lungcan.2007.05.019] [Citation(s) in RCA: 24] [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] [Subscribe] [Scholar Register] [Received: 03/26/2007] [Revised: 05/05/2007] [Accepted: 05/17/2007] [Indexed: 01/29/2023]
Abstract
Development of acquired resistance to gefitinib after an initial good response is common. Recently, it was reported that this acquired resistance is related to a secondary mutation associated with a substitution of threonine by methionine at codon 790 (T790M) of the epidermal growth factor receptor (EGFR) gene. In this report, we present a "never smoking" woman with advanced lung cancer who showed acquired resistance to gefitinib, and analysis of autopsy samples revealed no evidence of EGFR mutations in either exons 18-21 or codon 790, and positive immunostaining for breast cancer resistance protein (BCRP). We describe, for the first time, a case in which expression of BCRP was associated with acquired resistance to gefitinib, independent of EGFR mutations.
Collapse
Affiliation(s)
- J Usuda
- Department of Thoracic Surgery, Tokyo Medical University Hospital, Tokyo 160-0023, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Abstract
OBJECTIVE Platelet-derived growth factor (PDGF-BB) is suggested to be a potent stimulator and a strong mitogenic agent for human periodontal ligament cells (PDL). This study aimed at assessing the effectiveness of PDGF-BB application on periodontally diseased root surfaces through attachment and growth of fibroblast cells. MATERIALS AND METHODS Fifteen periodontally involved and five healthy teeth were selected, prepared from proximal surfaces and distributed into four groups (10 specimens per group): I: healthy; II: untreated diseased; III: scaling and root planning (SRP); and IV: SRP and PDGF-BB. Each group had three subdivisions (three specimens per group) which were incubated at three different time periods. The remaining specimen for each group was used to examine surface topography. Fibroblasts were pooled on root specimens and incubated. Results were evaluated by using scanning electron microscopy. Repeated cell counting was done within a representative standard area. RESULTS The best results regarding PDL cell shape and density were obtained at day 3 in all experimental groups, except the diseased group. Although SRP samples showed slightly higher results in numbers of attached fibroblasts than diseased samples, they demonstrated a similar negative effect denoting incompatible root surfaces for fibroblast attachment. SRP plus PDGF-BB and healthy samples showed a comparable positive effect, suggesting a good root surface biocompatibility. Inter-group differences showed no significant differences on day 1, but statistically significant differences were found on both day 3 and day 7 incubation periods favoring groups I and IV over groups II and III. CONCLUSIONS Platelet-derived growth factor showed a positive effect on adhesion and growth of cultured fibroblasts to periodontally diseased surfaces. Thus, PDGF-BB may have a promising role in clinical periodontics.
Collapse
Affiliation(s)
- M H Belal
- Department of Oral Medicine and Periodontology, Faculty of Dentistry, El-Minya University, El-Minya, Egypt.
| | | | | | | |
Collapse
|
18
|
Abstract
Here we report that successful bone formation with a vascular flap inside a cylindrical mold was induced from fat tissue with the use of recombinant human bone morphogenetic protein-2 in rats. Fat tissue connected to blood vessels was prepared to fit into the mold and implanted intramuscularly into the hind leg in Wistar rats. RhBMP-2 (20 micro g) was applied in a collagen sheet previously placed on the inside surface of the mold. Bone formation was confirmed radiologically and morphologically at 2, 4, and 8 weeks after the surgery. In the control group without rhBMP-2 or the group with ligation of the blood vessels before the implantation, bone formation was not observed. Our success in bone formation having a definite size, shape, and blood supply may lead to a therapeutic approach to effective bone reconstitution. The present study is the first report on bone induction from fat tissue by rhBMP-2 in vivo.
Collapse
Affiliation(s)
- M Hosoya
- Oral Surgery, Department of Oral Restitution, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo, Tokyo 113-8549, Japan
| | | | | | | | | | | |
Collapse
|
19
|
Abstract
Human mesenchymal stem cells (HMSC) have the potential to differentiate into many cell types. The physiological properties of HMSCs including their Ca(2+) signaling pathways, however, are not well understood. We investigated Ca(2+) influx and release functions in HMSCs. In Ca(2+) imaging experiments, spontaneous Ca(2+) oscillations were observed in 36 of 50 HMSCs. The Ca(2+) oscillations were completely blocked by the application of 10 micro M cyclopiazonic acid (CPA) or 1 micro M thapsigargin (TG). A brief application of 1 micro M acetylcholine (ACh) induced a transient increase of [Ca(2+)](i) but the application of caffeine (10 mM) did not induce any Ca(2+) transient. When the stores were depleted with Ca(2+)-ATPase blockers (CPA or TG) or muscarinic agonists (ACh), store-operated Ca(2+) (SOC) entry was observed. Using the patch-clamp technique, store-operated Ca(2+) currents (I(SOC)) could be recorded in cells treated with ACh or CPA, but voltage-operated Ca(2+) currents (VOCCs) were not elicited in most of the cells (17/20), but in 15% of cells examined, small dihydropyridine (DHP)-sensitive Ca(2+) currents were recorded. Using RT-PCR, mRNAs were detected for inositol 1,4,5-trisphosphate receptor (InsP(3)R) type I, II, and III and DHP receptors alpha1A and alpha1H were detected, but mRNA was not detected for ryanodine receptor (RyR) or N-type Ca(2+) channels. These results suggest that in undifferentiated HMSCs, Ca(2+) release is mediated by InsP(3)Rs and Ca(2+) entry through plasma membrane is mainly mediated by the SOCs channels with a little contribution of VOCCs.
Collapse
Affiliation(s)
- S Kawano
- Department of Cardiovascular Diseases, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan.
| | | | | | | | | | | |
Collapse
|
20
|
Tanaka N, Miyamoto T, Kimijima Y, Mimura M, Ichinose S. Microvilli and desmosomes of squamous cell carcinoma cells in tongue carcinoma related to regional lymph node metastasis: ultrastructural and immunohistochemical studies with transferrin receptor. Med Electron Microsc 2002; 33:157-64. [PMID: 11810474 DOI: 10.1007/s007950000016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2000] [Accepted: 10/03/2000] [Indexed: 10/27/2022]
Abstract
Squamous cell carcinomas of the tongue (n = 49), consisting of 21 cases with cervical lymph node metastasis and 28 nonmetastatic cases, were examined by electron microscopy with special emphasis on tumor cell attachment. No difference of tumor size (T classification) or pathological findings between the metastatic group and the nonmetastatic group was found. The metastatic cases had numerous microvilli and a small number of desmosomes regardless of the width of the intercellular spaces. The nonmetastatic cases had few microvilli in relatively wide intercellular spaces, or, in the cases in which numerous microvilli were present in the narrow intercellular spaces, the tumor cells were connected by a large number of desmosomes. Transferrin receptor, which is a marker of cell proliferation, was localized in the cell membrane by immunohistochemistry and especially in microvilli by immunoelectron microscopy. It is suggested that microvilli might be related to the proliferation and the metastasis of squamous cell carcinoma cells.
Collapse
Affiliation(s)
- N Tanaka
- Department of Oral Surgery, Sapporo Medical University School of Medicine, South 1, West 16, Chuou-ku, Sapporo, Hokkaido 060-0061, Japan.
| | | | | | | | | |
Collapse
|
21
|
Tanaka N, Ichinose S, Kimijima Y, Mimura M. Investigation of titanium leak to bone tissue surrounding dental titanium implant: electron microscopic findings and analysis by electron diffraction. Med Electron Microsc 2002; 33:96-101. [PMID: 11810465 DOI: 10.1007/s007950070008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2000] [Accepted: 07/01/2000] [Indexed: 10/27/2022]
Abstract
This study investigated the tissue response associated with dental titanium implants. The mandibular third and fourth premolars and first molar of three adult beagle dogs were extracted bilaterally. Healing was then allowed for 3 months. Six titanium implants were placed in the mandibles of a dog. Three weeks after the implantation, mandibular sections containing the implants were retrieved with the use of a bone saw and investigated by light and electron microscopy, X-ray microanalyzer, and electron diffraction. Scanning electron microscopic observation showed titanium particles on the implant-bone interface, and investigation by microanalyzer revealed titanium not only on the implant-bone interface but also in the bone tissue. Transmission electron microscopic observation and investigation by electron diffraction showed titanium in the bone matrix and cells other than macrophages. In this study, titanium particles from the dental implant were recognized morphologically in the surrounding bone tissue. Thus, study of the influence of titanium particles on the human body is needed.
Collapse
Affiliation(s)
- N Tanaka
- Department of Oral Surgery, Sapporo Medical University School of Medicine, South 1, West 16, Chuou-ku, Sapporo 060-0061, Japan.
| | | | | | | |
Collapse
|
22
|
Sasaki KM, Aoki A, Masuno H, Ichinose S, Yamada S, Ishikawa I. Compositional analysis of root cementum and dentin after Er:YAG laser irradiation compared with CO2 lased and intact roots using Fourier transformed infrared spectroscopy. J Periodontal Res 2002; 37:50-9. [PMID: 11842938 DOI: 10.1034/j.1600-0765.2002.00657.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present study examines the dental root after Er:YAG laser irradiation, compared with CO2 lased and non-treated surfaces, using Fourier Transformed Infrared (FTIR) spectroscopy. Freshly extracted human teeth were irradiated by Er:YAG laser at an energy output of 40 mJ/pulse, 10 Hz (0.4 watts), with or without water coolant, and by CO2 laser at an energy output of 0.5 watts in continuous wave mode without coolant. The surfaces were chalky and smooth after irradiation by Er:YAG laser with water coolant, were charred and irregular after irradiation by Er:YAG laser without water coolant, and were completely carbonized after CO2 laser irradiation. The FTIR profiles from samples of the surfaces that were irradiated by Er:YAG laser with water coolant were similar to those from non-treated samples, except for a slight decrease on the OH and amide bands, which are mainly related to organic components. This decrease was observed to be extreme after CO2 laser irradiation and moderate after Er:YAG laser irradiation without coolant. The formation of new bands showing toxic substances was observed to a large extent after CO2 laser irradiation and to a smaller extent after Er:YAG laser irradiation without water coolant. In contrast, no such bands were detected after Er:YAG laser irradiation with water coolant. The present results show that these laser treatments selectively ablated more organic components than inorganic components and that Er:YAG laser irradiation with water coolant did not cause major compositional changes or chemically deleterious changes in either root cementum or dentin.
Collapse
Affiliation(s)
- K M Sasaki
- Department of Hard Tissue Engineering, Graduate School, Tokyo Medical and Dental University, Japan.
| | | | | | | | | | | |
Collapse
|
23
|
Shimabukuro K, Ichinose S, Koike R, Kubota T, Yamaguchi M, Miyasaka M, Aso T. Hepatocyte growth factor/scatter factor is implicated in the mode of stromal invasion of uterine squamous cervical cancer. Gynecol Oncol 2001; 83:205-15. [PMID: 11606073 DOI: 10.1006/gyno.2001.6347] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The purpose of this study was to examine the relationship of hepatocyte growth factor/scatter factor (HGF/SF) to cell motility and invasion in uterine cervical cancer. METHODS We examined the expression of HGF/SF and its receptor, c-met, in cervical cancer cell lines SKG-IIIa (squamous cell carcinoma) and Hela-S3 (adenocarcinoma) and in stromal cells of the cervical cancer tissue by reverse transcription-polymerase chain reaction. We studied the effect of HGF/SF on invasiveness of SKG-IIIa and Hela-S3 in an invasion model of the modified Boyden chamber method and by electron microscopy. SKG-IIIa cells were also seeded on the thick Matrigel-coated layer to evaluate the invasion patterns in three-dimensional directions. To investigate the mechanism of an inductive effect of HGF/SF on the invasiveness of SKG-IIIa, we examined the effect of HGF/SF on the expression of intercellular adhesion molecule E-cadherin, cell-substrate adhesion molecules CD44, alpha2beta1, and alpha6beta1, and intracellular skeleton fiber actin in SKG-IIIa in cell enzyme-linked immunosorbent assay (ELISA) and immunofluorescence staining. RESULTS HGF/SF messenger RNA (mRNA) was detected in stromal cells, and c-met mRNA was detected in SKG-IIIa and Hela-S3. Hela-S3 that initially showed weak intercellular contact freely invaded the Matrigel-coated multiporous membrane without the addition of HGF/SF. In contrast, SKG-IIIa that initially showed strong intercellular adhesion could invade the membrane after the addition of HGF/SF. The same results were represented by an addition of HECD-1, an anti-human E-cadherin antibody. In an experiment with cell culture in a thick Matrigel layer, control SKG-IIIa showed a mirror-ball-like invasion pattern, whereas HGF/SF-stimulated SKG-IIIa spread horizontally over the membrane and migrated through the membrane holes, presenting a tentacular invasion pattern. Migration of SKG-IIIa under the membrane was confirmed by scanning and transmission electron microscopy. The addition of HGF/SF in cell ELISA assay decreased the expression of E-cadherin and actin in SKG-IIIa, but it did not change the expression of CD44, alpha2beta1, and alpha6beta1. Immunofluorescence staining revealed that the expression of E-cadherin in cell membrane was disturbed by HGF/SF. CONCLUSIONS Our data indicate that HGF/SF produced by stromal cells influences the mode of stromal invasion of squamous cervical cancer by selectively decreasing the expression of both E-cadherin and actin.
Collapse
Affiliation(s)
- K Shimabukuro
- Comprehensive Reproductive Medicine, Graduate School, Tokyo, Japan.
| | | | | | | | | | | | | |
Collapse
|
24
|
Tanaka N, Mimura M, Ichinose S, Odajima T. Malignant melanoma in the oral region: ultrastructural and immunohistochemical studies. Med Electron Microsc 2001; 34:198-205. [PMID: 11793197 DOI: 10.1007/s007950100016] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2001] [Accepted: 08/17/2001] [Indexed: 10/27/2022]
Abstract
Malignant melanoma in the oral region is reviewed in its clinicopathological aspects. Clinically the melanomas were classified into five types; however, there were no histopathological differences according to these clinical types. Electron microscopic observation of the melanomas and primary culture cells derived from oral malignant melanoma revealed that, in patients whose prognoses were relatively good, many mature-stage melanosomes were found. Immunohistologically, there was a positive reaction for transferrin receptor and the expression of pRb2/p130 was found in only 2 of 13 patients, who are still alive after periods of over 14 years. The radiosensitivity of a cell line derived from human oral malignant melanoma was greater than that in cell lines derived from human cutaneous melanoma and with radiation, the number of melanosomes increased. There are very few clinical cases of oral malignant melanoma and very few cell lines derived from oral malignant melanoma, and so findings in these patients and these cell lines should be accumulated in order to clarify the biological behavior of oral malignant melanoma.
Collapse
Affiliation(s)
- N Tanaka
- Department of Oral Surgery, Sapporo Medical University School of Medicine, South 1, West 16, Chuou-ku, Sapporo 060-0061, Japan.
| | | | | | | |
Collapse
|
25
|
Kuroiwa T, Nagaoka T, Miyasaka N, Akimoto H, Zhao F, Yamada I, Ueki M, Ichinose S. Time course of trace of diffusion tensor [Trace(D)] and histology in brain edema. Acta Neurochir Suppl 2001; 76:191-4. [PMID: 11450004 DOI: 10.1007/978-3-7091-6346-7_38] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
We examined the correlation between changes in the trace of diffusion tensor [Trace(D)], regional water content and tissue ultrastructure relating to cellular (cytotoxic) and vasogenic brain edema. Cellular edema was induced by left middle cerebral artery occlusion in cats (Kuroiwa T et al., 1998). Vasogenic edema was induced in the white matter of cats by a cold lesion (Kuroiwa T et al., 1999). In cellular edema, the water content increase correlated linearly with the Trace(D) decrease in both the gray and white matter. However, both the slopes and intercepts of the correlation lines were significantly different. Hydropic astrocytic swelling was seen in both structures, and in the white matter, oligodendrocytic and myelinated axonal swelling were observed. In vasogenic edema, the increase in Trace(D) showed a significant linear correlation with the increase in tissue water content. Histologically, nerve fibers were dissociated and the extracellular space was markedly enlarged with protein-rich fluid. These result showed that the different slopes and intercepts of the water content--Trace(D) correlation lines for different subtype of brain edema, which reflect different ultrastructural localization of water, should be taken into account when evaluating brain edema using Trace(D) mapping.
Collapse
Affiliation(s)
- T Kuroiwa
- Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Mitsutake S, Tani M, Okino N, Mori K, Ichinose S, Omori A, Iida H, Nakamura T, Ito M. Purification, characterization, molecular cloning, and subcellular distribution of neutral ceramidase of rat kidney. J Biol Chem 2001; 276:26249-59. [PMID: 11328816 DOI: 10.1074/jbc.m102233200] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Previously, we reported two types of neutral ceramidase in mice, one solubilized by freeze-thawing and one not. The former was purified as a 94-kDa protein from mouse liver, and cloned (Tani, M., Okino, N., Mori, K., Tanigawa, T., Izu, H., and Ito, M. (2000) J. Biol. Chem. 275, 11229--11234). In this paper, we describe the purification, molecular cloning, and subcellular distribution of a 112-kDa membrane-bound neutral ceramidase of rat kidney, which was completely insoluble by freeze-thawing. The open reading frame of the enzyme encoded a polypeptide of 761 amino acids having nine putative N-glycosylation sites and one possible transmembrane domain. In the ceramidase overexpressing HEK293 cells, 133-kDa (Golgi-form) and 113-kDa (endoplasmic reticulum-form) Myc-tagged ceramidases were detected, whereas these two proteins were converted to a 87-kDa protein concomitantly with loss of activity when expressed in the presence of tunicamycin, indicating that the N-glycosylation process is indispensable for the expression of the enzyme activity. Immunohistochemical analysis clearly showed that the ceramidase was mainly localized at the apical membrane of proximal tubules, distal tubules, and collecting ducts in rat kidney, while in liver the enzyme was distributed with endosome-like organelles in hepatocytes. Interestingly, the kidney ceramidase was found to be enriched in the raft microdomains with cholesterol and GM1 ganglioside.
Collapse
Affiliation(s)
- S Mitsutake
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Inoue A, Omori A, Ichinose S, Takahashi KP, Kinoshita Y, Mita S. S1 proteins C2 and D2 are novel hnRNPs similar to the transcriptional repressor, CArG box motif-binding factor A. Eur J Biochem 2001; 268:3654-63. [PMID: 11432731 DOI: 10.1046/j.1432-1327.2001.02267.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
S1 proteins A-D are liberated from thoroughly washed nuclei by mild digestion with DNase I or RNase A, and extracted selectively at pH 4.9 from the reaction supernatants. Here, we characterized the S1 proteins, focusing on protein D2, the most abundant S1 protein in the rat liver, and on protein C2 as well. Using a specific antibody, McAb 351, they were shown to occur in the extranucleolar nucleoplasm, and to be extracted partly in the nuclear soluble fraction. We demonstrate that the S1 proteins in this fraction exist constituting heterogeneous nuclear ribonucleoproteins (hnRNPs), through direct binding to hnRNAs, as revealed by centrifugation on density gradients, immunoprecipitation, and UV cross-linking. In hnRNPs, protein D2 occurred at nuclease-hypersensitive sites and C2 in the structures that gave rise to 40 S RNP particles. By microsequencing, protein D2 was identified with a known protein, CArG box motif-binding factor A (CBF-A), which has been characterized as a transcriptional repressor, and C2 as its isoform protein. In fact, CBF-A expressed from its cDNA was indistinguishable from protein D2 in molecular size and immunoreactivity to McAb 351. Thus, the present results demonstrate that S1 proteins C2 and D2 are novel hnRNP proteins, and suggest that the proteins C2 and D2 act in both transcriptional and post-transcriptional processes in gene expression.
Collapse
Affiliation(s)
- A Inoue
- Department of Biochemistry, Osaka City University Medical School, Abenoku, Osaka, Japan.
| | | | | | | | | | | |
Collapse
|
28
|
Kikuchi M, Itoh S, Ichinose S, Shinomiya K, Tanaka J. Self-organization mechanism in a bone-like hydroxyapatite/collagen nanocomposite synthesized in vitro and its biological reaction in vivo. Biomaterials 2001; 22:1705-11. [PMID: 11396873 DOI: 10.1016/s0142-9612(00)00305-7] [Citation(s) in RCA: 724] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
When bone is lost due to injury and/or illness, the defects are generally filled with natural bone because artificial bone materials have problems of bioaffinity. However, natural bone also has supply and infection problems. If an artificial material has the same biological properties as bone, it can replace natural bone for grafting. We synthesized a hydroxyapaite (HAp) and collagen (Col) composite by a simultaneous titration coprecipitation method using Ca(OH)2, H3PO4 and porcine atelocollagen as starting materials. The composite obtained showed a self-organized nanostructure similar to bone assembled by the chemical interaction between HAp and Col. The consolidated composite by a cold isostatic pressure of 200 MPa indicated a quarter of the mechanical strength of bone. It also indicated the same biological properties as grafted bone: The material was resorbed by phagocytosis of osteoclast-like cells and conducted osteoblasts to form new bone in the surrounding area. This HAp/Col composite having similar nanostructure and composition can replace autologous bone grafts.
Collapse
Affiliation(s)
- M Kikuchi
- National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki, Japan.
| | | | | | | | | |
Collapse
|
29
|
Itoh S, Matubara M, Kawauchi T, Nakamura H, Yukitake S, Ichinose S, Shinomiya K. Enhancement of bone ingrowth in a titanium fiber mesh implant by rhBMP-2 and hyaluronic acid. J Mater Sci Mater Med 2001; 12:575-581. [PMID: 15348249 DOI: 10.1023/a:1011277207574] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The present study was designed to evaluate the efficacy of high molecular weight hyaluronic acid (HA) used as a carrier of recombinant human bone morphogenetic protein-2 (rhBMP-2) adsorbed to a titanium fiber mesh implant (TFMI) in vivo. The quantity of HA in the TFMI rapidly decreased during the initial 3-day period after implantation. BMP particles were trapped by the meshwork of HA as observed by scanning electron microscopy (SEM). TFMIs containing LF-6, HA, rhBMP-2, or HA combined with rhBMP-2 were implanted on the cranium of rats. Analysis of digitized SEM images of samples obtained six weeks post-implantation was performed to determine the area occupied by new bone. The area fraction of Ca relative to that of the pores of TFMI in the HA group was larger than that in the Ti group (p<0.05). The area fraction of Ca in both the BMP and HA+BMP groups was larger than that in both the Ti and HA groups (p<0.01), and that in the HA+BMP group was larger than that in the BMP group (p<0.05). It is suggested that HA is not only an effective carrier of BMP, but also it may have a positive effect on the generation of new bone in the TFMI.
Collapse
Affiliation(s)
- S Itoh
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan.
| | | | | | | | | | | | | |
Collapse
|
30
|
Gao CF, Ren S, Zhang L, Nakajima T, Ichinose S, Hara T, Koike K, Tsuchida N. Caspase-dependent cytosolic release of cytochrome c and membrane translocation of Bax in p53-induced apoptosis. Exp Cell Res 2001; 265:145-51. [PMID: 11281652 DOI: 10.1006/excr.2001.5171] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Activation of p53 induces apoptosis in various cell types. However, the mechanism by which p53 induces apoptosis is still unclear. We reported previously that the activation of a temperature-sensitive mutant p53 (p53(138Val)) induced activation of caspase 3 and apoptosis in Jurkat cells. To elucidate the pathway linking p53 and downstream caspases, we examined the activation of caspases 8 and 9 in apoptotic cells. The results showed that both caspases were activated during apoptosis as judged by the appearance of cleavage products from procaspases and the caspase activities to cleave specific fluorogenic substrates. The significant inhibition of apoptosis by a tetrapeptide inhibitor of caspase 8 and caspase 9 suggested that both caspases are required for apoptosis induction. In addition, the membrane translocation of Bax and cytosolic release of cytochrome c, but not loss of mitochondrial membrane potential, were detected at an early stage of apoptosis. Moreover, Bax translocation, cytochrome c release, and caspase 9 activation were blocked by the broad-spectrum caspase inhibitor, Z-VAD-fmk and the caspase 8-preferential inhibitor, Ac-IETD-CHO, suggesting that the mitochondria might participate in apoptosis by amplifying the upstream death signals. In conclusion, our results indicated that activation of caspase 8 or other caspase(s) by p53 triggered the membrane translocation of Bax and cytosolic release of cytochrome c, which might amplify the apoptotic signal by activating caspase 9 and its downstream caspases.
Collapse
Affiliation(s)
- C F Gao
- Department of Molecular Cellular Oncology and Microbiology, Tokyo Medical and Dental University, 5-45 Yoshima, 1-Chome, Bunkyo-Ku, Tokyo, 113-8549, Japan
| | | | | | | | | | | | | | | |
Collapse
|
31
|
Ikezono T, Omori A, Ichinose S, Pawankar R, Watanabe A, Yagi T. Identification of the protein product of the Coch gene (hereditary deafness gene) as the major component of bovine inner ear protein. Biochim Biophys Acta 2001; 1535:258-65. [PMID: 11278165 DOI: 10.1016/s0925-4439(00)00101-0] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In order to better understand the cause of hereditary hearing impairment, we have performed a proteomic analysis of the inner ear proteins using two-dimensional gel electrophoresis. In the process of analysis, we have found very unique properties of the bovine homologue of the human COCH gene product. The COCH gene is responsible for one of the hereditary hearing impairments, DFNA9, and was recently suggested to be a possible genetic factor contributing to Ménière's disease. The Coch protein constitutes 70% of bovine inner ear proteins and is composed of 16 different protein spots, with charge and size heterogeneity. Heterogeneity of this protein suggests that the Coch gene is processed in several ways, at the transcriptional and/or posttranslational level. Much knowledge has accumulated about the hereditary hearing impairment genes; however, little research has been done regarding the protein products of those genes. This is the first report to characterize the Coch protein. Study of the Coch protein might provide more information on the mechanism of hearing and vestibular disorders.
Collapse
Affiliation(s)
- T Ikezono
- Department of Otorhinolaryngology, Nippon Medical School, Tokyo, Japan.
| | | | | | | | | | | |
Collapse
|
32
|
Itoh S, Kikuchi M, Takakuda K, Koyama Y, Matsumoto HN, Ichinose S, Tanaka J, Kawauchi T, Shinomiya K. The biocompatibility and osteoconductive activity of a novel hydroxyapatite/collagen composite biomaterial, and its function as a carrier of rhBMP-2. J Biomed Mater Res 2001; 54:445-53. [PMID: 11189053 DOI: 10.1002/1097-4636(20010305)54:3<445::aid-jbm190>3.0.co;2-9] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A hydroxyapatite/type I collagen (HAp/Col) composite, in which the hydroxyapatite nanocrystals align along the collagen molecules, has been prepared. The biocompatibility, osteoconductive activity, and efficacy as a carrier of recombinant human bone morphogenetic proteins (rhBMPs) of this novel biomaterial were examined. The composite material was implanted in the backs of Wistar rats, and specimens were collected for histological observations until week 24. In a second experiment, other samples of the composite material (5 x 5 x 10 mm3) were drilled and immersed in a solution of rhBMP-2 (0, 200, 400 microg/mL), and subsequently grafted in radii and ulnae in beagle dogs. As a control, three unfilled holes were left in one radius and ulna. X-ray images were prepared, and specimens collected for histological observation at weeks 8 and 12. Histological findings of the composites grafted in rats showed that the surface of the material was eroded as a result of macrophage infiltration. X-ray images and histological findings for the composites implanted in dogs support the idea that HAp/ Col has a high osteoconductive activity and is able to induce bone-remodeling units. In cases where the implants are grafted at weight bearing sites, treatment with rhBMP-2 at a dose of 400 microg/mL may be useful to shorten the time needed until bone union has occurred.
Collapse
Affiliation(s)
- S Itoh
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Abstract
Previously, we reported that Mycoplasma fermentans has specific antigens (phosphocholine-containing glycoglycerolipids: GGPL-I and GGPL-III) and discussed the possibility of their pathogenic role. In this paper, we report the characterization of a monoclonal antibody (MF-III-1) specific to GGPL-III (phosphocholine-containing aminoglycoglycerolipid) using methods of electron microscopy, immunofluorescence cell surface staining, laser scanning microscopy, immunoelectron microscopy, and thin-layer chromatography immunostaining. The MF-III-1 antibody specifically recognized M. fermentans attached to the surface of HTLV-I-infected human helper T-cells, and it did not cross-react with other lipids nor with human T-cell antigens. Since MF-III-1 distinguishes GGPL-III from GGPL-I, the binding site may include a serinol (2-amino-1,3-propanediol) residue of GGPL-III. MF-III-1 is useful for the in vitro study of M. fermentans, and may also be useful as a tool for the study of the involvement of M. fermentans in human diseases.
Collapse
Affiliation(s)
- K Matsuda
- Department of Microbiology, Tokyo Medical and Dental University, Japan.
| | | | | | | | | | | |
Collapse
|
34
|
Imai H, Suzuki K, Ishizaka K, Ichinose S, Oshima H, Okayasu I, Emoto K, Umeda M, Nakagawa Y. Failure of the expression of phospholipid hydroperoxide glutathione peroxidase in the spermatozoa of human infertile males. Biol Reprod 2001; 64:674-83. [PMID: 11159372 DOI: 10.1095/biolreprod64.2.674] [Citation(s) in RCA: 160] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Phospholipid hydroperoxide glutathione peroxidase (PHGPx) was intensely expressed in mitochondria in the midpiece of human spermatozoa by immunostaining with anti-PHGPx monoclonal antibodies. The PHGPx not only reduced phospholipid hydroperoxide but also scavenged hydrogen peroxide in human spermatozoa. We found a dramatic decrease in the level of expression of PHGPx in the spermatozoa of some infertile males by immunoblotting with anti-PHGPx monoclonal antibodies. These individuals accounted for about 10% of the group of 73 infertile males that we examined. All seven patients with PHGPx-defective spermatozoa were classified as suffering from oligoasthenozoospermia, a defect in which both the number and the motility of spermatozoa are significantly below normal. Males with PHGPx-defective spermatozoa accounted for 26% of the 27 infertile males with oligoasthenozoospermia. No defects in expression of PHGPx in spermatozoa were observed in 31 fertile volunteers. After a 3-h incubation, the relative number of motile spermatozoa with low-level expression of PHGPx was significantly lower than that of spermatozoa with normal expression of PHGPx. The PHGPx-defective spermatozoa failed to incorporate rhodamine 123, revealing a loss of mitochondrial membrane potential. Ultrastructual analysis of mitochondria by electron microscopy demonstrated that the morphology of mitochondria in PHGPx-defective spermatozoa was abnormal. The results suggest that failure of the expression of mitochondrial PHGPx in spermatozoa might be one of the causes of oligoasthenozoospermia in infertile men.
Collapse
Affiliation(s)
- H Imai
- School of Pharmaceutical Sciences, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Abstract
A silicone tube (S-tube) was packed with CPLA (copolymer of poly-L-lactide) fibers (S-tube+CPLA) or collagen fibers (S-tube+fiber). Two types of tube were prepared from a collagen sheet (Col-tube) and a bioabsorbable atelocollagen membrane for guided tissue regeneration (GTR-tube). They were packed with collagen fibers or films (Col-tube+fiber, GTR-tube+fiber and GTR-tube+film). Bridge grafting (15 mm in length) was performed with these tubes in a rat sciatic nerve model. Specimens were harvested after 8 weeks. Minifascicles were formed in the open space between the CPLA fibers in the S-tube+CPLA group. Regenerated axons were also formed in the degenerated collagen fibers in the S-tube+Col group. Immunocytochemistry evaluation revealed that Schwann cells invaded the space in the absorbing collagen fibers. Histologic analysis of the regenerated axons in the groups with Col-tubes or GTR-tubes revealed that both the Col-tube and the GTR-tube packed with collagen fibers were effective in providing a scaffold for regenerating nerve tissue.
Collapse
Affiliation(s)
- S Itoh
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Japan
| | | | | | | | | |
Collapse
|
36
|
Seko Y, Pang J, Tokoro T, Ichinose S, Mochizuki M. Blue light-induced apoptosis in cultured retinal pigment epithelium cells of the rat. Graefes Arch Clin Exp Ophthalmol 2001; 239:47-52. [PMID: 11271461 DOI: 10.1007/s004170000220] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
BACKGROUND We previously demonstrated that phagosome-free retinal pigment epithelium (RPE) cells in culture can be damaged directly by blue light (wavelength 440+/-10 nm) as observed by electron microscope. A low intensity (1.0 mW/cm2) of light induced only swelling of mitochondria, while a high intensity (4.0 mW/cm2) induced necrosis in the RPE. The aim of the present study was to investigate what intensity of blue light could induce apoptosis in cultured phagosome-free RPE. METHODS Primary cultured RPE cells, harvested from Long-Evans rats, that contained no phagosomes were exposed to a cool blue light (wavelength 440+/-10 nm). After exposure, transmission electron microscopy (TEM) and TdT-mediated dUTP nick-end labeling (TUNEL) staining were used to detect apoptosis in the RPE cells. To assess the relationship of oxidation to apoptosis by blue light, we added N-acetylcysteine (NAC) as a free radical scavenger and investigated its inhibitory effect on apoptosis. RESULTS In RPE cells exposed to blue light of 2.7 mW/cm2 for 24 h, apoptotic bodies were found by TEM. In RPE cells exposed to blue light of 2.0 mW/cm2 for 60 h, apoptotic bodies, nuclear condensation and nuclear segmentation were observed by TEM and some RPE cells showed positive TUNEL staining. When 30 mM of NAC was added, TUNEL staining was negative. CONCLUSION Our findings demonstrate that apoptotic cell death is induced by blue light exposure in cultured RPE cells in vitro. The findings of our previous experiments and those of the present study suggest that a higher intensity of blue light could induce necrosis, and moderately intense blue light could induce non-necrotic cell death or apoptosis, in RPE cells. Furthermore, it is suggested that blue light caused cell death by a free-radical-associated mechanism.
Collapse
Affiliation(s)
- Y Seko
- Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University Graduate School, Japan
| | | | | | | | | |
Collapse
|
37
|
Horibata Y, Okino N, Ichinose S, Omori A, Ito M. Purification, characterization, and cDNA cloning of a novel acidic endoglycoceramidase from the jellyfish, Cyanea nozakii. J Biol Chem 2000; 275:31297-304. [PMID: 10882727 DOI: 10.1074/jbc.m003575200] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Endoglycoceramidase (EC ) is an enzyme capable of cleaving the glycosidic linkage between oligosaccharides and ceramides in various glycosphingolipids. We report here the purification, characterization, and cDNA cloning of a novel endoglycoceramidase from the jellyfish, Cyanea nozakii. The purified enzyme showed a single protein band estimated to be 51 kDa on SDS-polyacrylamide gel electrophoresis. The enzyme showed a pH optimum of 3.0 and was activated by Triton X-100 and Lubrol PX but not by sodium taurodeoxycholate. This enzyme preferentially hydrolyzed gangliosides, especially GT1b and GQ1b, whereas neutral glycosphingolipids were somewhat resistant to hydrolysis by the enzyme. A full-length cDNA encoding the enzyme was cloned by 5'- and 3'-rapid amplification of cDNA ends using a partial amino acid sequence of the purified enzyme. The open reading frame of 1509 nucleotides encoded a polypeptide of 503 amino acids including a signal sequence of 25 residues and six potential N-glycosylation sites. Interestingly, the Asn-Glu-Pro sequence, which is the putative active site of Rhodococcus endoglycoceramidase, was conserved in the deduced amino acid sequences. This is the first report of the cloning of an endoglycoceramidase from a eukaryote.
Collapse
Affiliation(s)
- Y Horibata
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka 812-8581 Japan
| | | | | | | | | |
Collapse
|
38
|
Aoyama S, Kino K, Amagasa T, Kayano T, Ichinose S, Kimijima Y. Differential diagnosis of calcium pyrophosphate dihydrate deposition of the temporomandibular joint. Br J Oral Maxillofac Surg 2000; 38:550-3. [PMID: 11010794 DOI: 10.1054/bjom.2000.0313] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Calcium pyrophosphate dihydrate (CPPD) deposition disease (pseudogout) of the temporomandibular joint (TMJ) is rare. It is characterized by the presence of crystal deposits that are birefringent under polarized light. Although these crystals are characteristically weakly birefringent, some other crystals such as those of calcium oxalate, synthetic steroids, and ethylenediaminetetraacetic acid are also birefringent. The differential diagnosis should therefore be based on a quantitative analysis of crystals or observation of the crystal structure in calcified sections. We present a case of CPPD deposition disease of the TMJ and report on the value of such an analysis to substantiate the diagnosis.
Collapse
Affiliation(s)
- S Aoyama
- Maxillofacial Surgery, Maxillofacial Reconstruction and Function, Division of Maxillofacial and Neck Reconstruction, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | | | | | | | | | | |
Collapse
|
39
|
Yoneyama K, Shima K, Ghi H, Ishizumi T, Ichinose S, Okada S, Nakajima R, Taguchi F, Kito T, Nitadori J, Ishida J, Miyajima K, Kato H. Recent problems in population surveys for lung cancer. Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80819-3] [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: 11/27/2022]
|
40
|
Shima K, Wei BR, Yoneyama K, Ichinose S, Konaka C, Kato H. Combined anti-cancer drug and hyperbaric oxygen therapy (HBO). Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80266-4] [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: 11/29/2022]
|
41
|
Arakawa S, Nakajima T, Ishikura H, Ichinose S, Ishikawa I, Tsuchida N. Novel apoptosis-inducing activity in Bacteroides forsythus: a comparative study with three serotypes of Actinobacillus actinomycetemcomitans. Infect Immun 2000; 68:4611-5. [PMID: 10899863 PMCID: PMC98390 DOI: 10.1128/iai.68.8.4611-4615.2000] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacteroides forsythus, which has been reported to be associated with periodontitis but has not been recognized as a key pathogen, was found to induce cytolytic activity against HL-60 and other human leukemic cells. This cytolytic activity was demonstrated according to three different criteria: (i) loss of both mitochondrial membrane potential and membrane integrity in cells treated with bacterial extracts and then with Rh123 and propidium iodide, respectively, as demonstrated by flow cytometry; (ii) damage to cytoplasmic membrane, as revealed by scanning electron microscopy (SEM); and (iii) DNA ladder formation and activation of caspase-3. These results indicate that B. forsythus produced an apoptosis-inducing factor(s) found to be composed of protein as judged by heat and trypsin sensitivity. In addition to extracts from B. forsythus, the culture supernatant of this bacterium has the ability to induce a cytolytic effect against peripheral white blood cells, especially lymphocytes. For comparison with B. forsythus, the same analyses were applied to two strains with different serotypes of Actinobacillus actinomycetemcomitans, serotypes a (ATCC 43717) and c (ATCC 43719), in addition to previously reported apoptosis-inducing serotype b (ATCC 43718), which was used as a positive control. The strains of A. actinomycetemcomitans serotypes a and b induced apoptosis in HL-60 cells as judged by the above three criteria but to a slightly lesser extent than did B. forsythus, while the serotype c strain produced apoptosis to a negligible extent. Detailed SEM images showed that the A. actinomycetemcomitans serotype a strain induced large-pore formation and the serotype b strain produced small pores with typical blebbing, while B. forsythus induced severe membrane ruffling. Further DNA ladder formation and caspase-3 activation were observed in the serotype a and b strains but not in the serotype c strain. The present paper is the first report of a protein factor(s) from B. forsythus and the A. actinomycetemcomitans serotype a strain which induces apoptotic cell death.
Collapse
Affiliation(s)
- S Arakawa
- Department of Molecular Cellular Oncology and Microbiology, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan.
| | | | | | | | | | | |
Collapse
|
42
|
Abstract
We evaluated neurotization after transplantation with lyophilized nerves, muscles, and arteries, and examined the possibility of practical application of long bridging grafts. Grafts of 10 mm and 25 mm of lyophilized nerves, muscles, and arteries harvested from Fisher rats were transplanted to the sciatic nerves of recipient Lewis rats. The histological changes undergone by short grafts were observed at weekly intervals. The sham-operated and isograft groups were used to compare the results of long grafts. In both the nerve and muscle-graft group, regenerated axons grew out through the residual basement membrane tube. But in the muscle graft group, phagocytosis of myofibril debris took longer than that of degenerated axons. No statistical differences were found between results of TSI, induced EMG, and quantitative analysis of myelinated axons in the nerve and muscle graft groups. No neurotization was noted in the long artery graft. In long grafts, laminin found on the basement membrane may not be sufficient to accelerate neurotization, and arteries should not be used for tubulization.
Collapse
Affiliation(s)
- S Itoh
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Japan
| | | | | | | | | | | |
Collapse
|
43
|
Tanaka N, Ichinose S, Suyama T, Kohama G. Ultrastructural and biophysical studies of the bone tissue surrounding a hydroxyapatite-coated implant: case report. J Oral Maxillofac Surg 2000; 58:685-90. [PMID: 10847296 DOI: 10.1016/s0278-2391(00)90170-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- N Tanaka
- Department of Oral Surgery, Sapporo Medical University School of Medicine, Japan.
| | | | | | | |
Collapse
|
44
|
Okino N, Ichinose S, Omori A, Imayama S, Nakamura T, Ito M. Molecular cloning, sequencing, and expression of the gene encoding alkaline ceramidase from Pseudomonas aeruginosa. Cloning of a ceramidase homologue from Mycobacterium tuberculosis. J Biol Chem 1999; 274:36616-22. [PMID: 10593963 DOI: 10.1074/jbc.274.51.36616] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We previously reported the purification and characterization of a novel type of alkaline ceramidase from Pseudomonas aeruginosa strain AN17 (Okino, N., Tani, M., Imayama, S., and Ito, M. (1998) J. Biol. Chem. 273, 14368-14373). Here, we report the molecular cloning, sequencing, and expression of the gene encoding the ceramidase of this strain. Specific oligonucleotide primers were synthesized using the peptide sequences of the purified ceramidase obtained by digestion with lysylendopeptidase and used for polymerase chain reaction. DNA fragments thus amplified were used as probes to clone the gene encoding the ceramidase from a genomic library of strain AN17. The open reading frame of 2,010 nucleotides encoded a polypeptide of 670 amino acids including a signal sequence of 24 residues, 64 residues of which matched the amino acid sequence determined for the purified enzyme. The molecular weight of the mature enzyme was estimated to be 70,767 from the deduced amino acid sequence. Expression of the ceramidase gene in Escherichia coli, resulted in production of a soluble enzyme with the identical N-terminal amino acid sequence. Recombinant ceramidase was purified to homogeneity from the lysate of E. coli cells and confirmed to be identical to the Pseudomonas enzyme in its specificity and other enzymatic properties. No significant sequence similarities were found in other known functional proteins including human acid ceramidase. However, we found a sequence homologous to the ceramidase in hypothetical proteins encoded in Mycobacterium tuberculosis, Dictyostelium discoideum, and Arabidopsis thaliana. The homologue of the ceramidase gene was thus cloned from an M. tuberculosis cosmid and expressed in E. coli, and the gene was demonstrated to encode an alkaline ceramidase. This is the first report for the cloning of an alkaline ceramidase.
Collapse
Affiliation(s)
- N Okino
- Department of Bioscience and Biotechnology, Division of Bioresource and Bioenvironmental Sciences, Graduate School Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
| | | | | | | | | | | |
Collapse
|
45
|
Kuroiwa T, Nagaoka T, Ueki M, Yamada I, Miyasaka N, Akimoto H, Ichinose S, Okeda R, Hirakawa K. Correlations between the apparent diffusion coefficient, water content, and ultrastructure after induction of vasogenic brain edema in cats. J Neurosurg 1999; 90:499-503. [PMID: 10067919 DOI: 10.3171/jns.1999.90.3.0499] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT The authors examined the correlation between changes in the apparent diffusion coefficient, regional water content, and tissue ultrastructure after vasogenic brain edema. METHODS Vasogenic edema was induced in the white matter of six cats by cortical cold lesioning. The trace of diffusion tensor (Trace[D]) obtained from magnetic resonance imaging to measure the orientationally averaged water diffusibility was compared with the corresponding tissue water content determined by gravimetric studies and with ultrastructural water localization. Edema fluid had spread to the subcortical and deep white matter by 4.5 hours postlesioning. The increase in Trace(D) showed a significant linear correlation with the increase in tissue water content, both in the subcortical and deep white matter as follows: y = 45.5x - 2367 (r = 0.94) and y = 37.0x - 1769 (r = 0.93), respectively, where x is the water content (gram water/gram tissue) and y the Trace(D) (x 10(-6) mm2/second). On histological examination, nerve fibers were found to be dissociated in the white matter and the extracellular space was markedly enlarged with protein-rich fluid. No noticeable hydropic swelling of the cellular components was observed. CONCLUSIONS A linear correlation was observed between increases in Trace(D) and increases in extracellular water volume in in vivo vasogenic brain edema. A similar correlation between the subcortical and deep white matter showing different arrangements of nerve fibers (parallel compared with intermingled, respectively) indicated that measurement of Trace(D) is a suitable parameter for the evaluation of vasogenic brain edema.
Collapse
Affiliation(s)
- T Kuroiwa
- Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Itoh S, Takakuda K, Samejima H, Ohta T, Shinomiya K, Ichinose S. Synthetic collagen fibers coated with a synthetic peptide containing the YIGSR sequence of laminin to promote peripheral nerve regeneration in vivo. J Mater Sci Mater Med 1999; 10:129-134. [PMID: 15348160 DOI: 10.1023/a:1008977221827] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The usefulness of collagen fibers and the YIGSR sequence (Tyr-lle-Gly-Ser-Arg) of laminin for nerve regeneration were examined in vivo. Type I collagen gel (G-group), Type I collagen fibers (F-group), Type I collagen fibers coated with laminin (L-group) or the YIGSR sequence (Y-group) were packed into silicone tubes, 15 mm long, and transplanted to the sciatic nerves of Wistar rats. Empty silicone tubes were used as the control. The animals were sacrificed 8 weeks after transplantation. Bridging of the nerve was confirmed in the F-(7/12), Y-(7/10) and L-group (6/10), but no bridging was observed in any of the animals of the G- and control group. Nerve regeneration among the space of collagen fibers was observed, and it was suggested that fibroblasts infiltrated the gap in the substance of the degenerated collagen fibers were followed by Schwann cells on the basis of immunocytochemistry. The number of myelinated axons per regenerated tissue in the tube (density), and total area of myelinated axons per measured regenerated tissue in the tube (% axon area) in each the L- and Y-group were significantly higher than that in the F-group (P < 0.05). These results suggest the possibility of obtaining adequate nerve regeneration with new artificial materials only.
Collapse
Affiliation(s)
- S Itoh
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Japan
| | | | | | | | | | | |
Collapse
|
47
|
Itoh S, Muneta T, Shinomiya K, Ichinose S. Electron microscopic evaluation of the effects of stress-shielding on maturation of the mid-substance and ligament-bone junction of the reconstructed anterior cruciate ligament in rabbits. J Mater Sci Mater Med 1999; 10:185-190. [PMID: 15348167 DOI: 10.1023/a:1008945709532] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
To analyze the effects of stress-shielding on graft maturation after the anterior cruciate ligament (ACL) reconstruction, autogenous ACL reconstruction using Achilles tendon was performed in rabbits. Two-end fixation with a ligament augmentation device (LAD), as a stress-shielding model (SS group), and pull-out fixation with Leeds-Keio artificial ligaments (L-K ligament), as a non-stress-shielding model (non-SS group), were investigated. Intact ACL was used as the control. Specimens were harvested 6 mon postoperatively, and the analysis was focused on collagen fibril maturation in the mid-substance and bone-anchoring pattern in the bone tunnel, under light and transmission electron microscopy. The density of collagen fibrils in the control was lower than that in both experimental groups (p<0.01). The per cent collagen area in the control was higher than that in the SS (p<0.01) and the non-SS group (p< 0.05). The per cent collagen area in the non-SS group was higher than that in the SS group (p<0.05). At the ligament-bone interface, intracellular calcification of the degenerated chondrocytes occurred in the non-SS group, while in the SS group hydroxyapatite deposits were observed only in the extracellular matrix. These results show unfavorable influence of stress-shielding on graft maturation not only in the mid-substance but also at the ligament-bone junction.
Collapse
Affiliation(s)
- S Itoh
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113, Japan.
| | | | | | | |
Collapse
|
48
|
Pang J, Seko Y, Tokoro T, Ichinose S, Yamamoto H. Observation of ultrastructural changes in cultured retinal pigment epithelium following exposure to blue light. Graefes Arch Clin Exp Ophthalmol 1998; 236:696-701. [PMID: 9782431 DOI: 10.1007/s004170050143] [Citation(s) in RCA: 21] [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] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
BACKGROUND The retina can be damaged by light even when levels of energy are well below the threshold for thermal damage, and the experimental damage of the retinal pigment epithelium (RPE) may be induced more easily by blue light than by longer wavelengths of visible light. The present study demonstrates the ultrastructural damage produced by exposure to blue light in cultured RPE. METHODS Long-Evans rats were enucleated 8-10 days after birth for primary culture. One week after seeding, the monolayer culture of RPE cells was exposed to a cool blue light (wavelength = 440 +/- 10 nm) for 36 h (12 h/day, 3 days) at 2.0 mW/cm2. Transmission electron microscopy was used to compare the exposed RPE with the control. The entire experiment was repeated 3 times independently. RESULTS The cytoplasm of the exposed RPE exhibited degenerative changes, such as large whorls of membrane, lamellar whorls and whorled inclusions. CONCLUSION The RPE cells can be damaged directly by blue light after excluding the possible influence of phagosomes. This primary culture of RPE can also serve as an in vitro model for the study of light damage to the RPE.
Collapse
Affiliation(s)
- J Pang
- Department of Ophthalmology, Tokyo Medical and Dental University, School of Medicine, Japan
| | | | | | | | | |
Collapse
|
49
|
Omori A, Oh-Ishi M, Ichinose S, Furudate S, Maeda T. Analyses of proteins related to the hereditary dwarfism of rdw rat. J Protein Chem 1998; 17:518. [PMID: 9723721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- A Omori
- Mitsubishikasei Institute of Life Sciences, Tokyo, Japan
| | | | | | | | | |
Collapse
|
50
|
Kuroiwa T, Kuwata T, Nakayama T, Takemura T, Sakuta M, Ichinose S, Goto Y, Okeda R. Mitochondrial encephalomyopathy showing prominent microvacuolation and necrosis of intestinal smooth muscle cells: a case diagnosed by rectal biopsy. Acta Neuropathol 1998; 96:86-90. [PMID: 9678517 DOI: 10.1007/s004010050863] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A 40-year-old woman who developed intestinal dysmobility was found, at rectal biopsy, to have marked microvacuolation of mucosal muscle layer cells, which corresponded to increased accumulation of abnormal mitochondria. Skeletal muscle biopsy specimens showed ragged-red fibers, vessels strongly reactive for succinic dehydrogenase, and focal deficiency of cytochrome c oxidase. Autopsy performed at the age of 50 revealed prominent accumulation of abnormal mitochondria in the intestinal smooth muscle cells with a mottled distribution of focal necrosis, multiple small cerebral infarcts with diffuse neuronal loss, and rarefaction of the perivascular white matter. Mitochondrial DNA analysis showed a point mutation at position 3243. This case, showing features of both mitochondrial neurogastrointestinal encephalomyopathy and mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS), indicates that routine intestinal biopsy can detect mitochondrial encephalomyopathy with gastrointestinal involvement. The main intestinal changes were extensive accumulation of abnormal mitochondria in the leiomyocytes and scattered focal necrosis.
Collapse
Affiliation(s)
- T Kuroiwa
- Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University, Japan.
| | | | | | | | | | | | | | | |
Collapse
|