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Oh K, Fujii K, Tanaka T, Watanabe M, Nanba Y, Asano K, Hisamitsu T. 295 ATTENUATING EFFECT OF BISPHOSPHONATE ON OXIDATIVE RESPONSES IN RATS WITH ADJUVANT ARTHRITIS. Eur J Pain 2006. [DOI: 10.1016/s1090-3801(06)60298-x] [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: 11/15/2022]
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52
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Kyo Y, Kanai KI, Asano K, Hisamitsu T, Suzaki H. Suppressive effect of fluticasone propionate on MMP expression in the nasal mucosa of allergic rhinitis patients in vivo. In Vivo 2006; 20:439-44. [PMID: 16900772] [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: 05/11/2023]
Abstract
The effects of intranasal corticosteroids on matrix metalloproteinases (MMPs) and their inhibitors (tissue inhibitors of metalloproteinases (TIMPs)) in the nasal mucosa of patients with allergic rhinitis (AR) are not known. Nasal mucosa biopsy specimens were obtained from AR patients, with or without the administration of fluticasone propionate (FP) nose drops, and from healthy volunteers as controls. The specimens were analyzed by immuno-histochemistry and ELISA for MMP-2, MMP-9, TIMP-1 and TIMP-2. The MMP-9 levels in nasal mucosa extracts in the AR patients were significantly higher than in the controls. A significant suppressive effect of FP on the MMP-9 levels was shown. The control subjects showed no MMP- or TIMP-positive cells, whereas such positive cells were clearly present in the AR patients. No MMP- or TIMP-positive cells were detected after topical application of FP. These results suggest that the suppressive effect of FP on MMP expression is, in part, responsible for its clinical efficacy in AR.
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Affiliation(s)
- Yoshiyuki Kyo
- Department of Otorhinolaryngology, School of Medicine, Showa University, Tokyo, Japan
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53
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Asano K, Asahina S, Sakai M, Matsuda T, Ou K, Maeda Y, Hisamitsu T. Attenuating effect of artemin on herpes-related pain responses in mice infected with herpes simplex. In Vivo 2006; 20:533-7. [PMID: 16900785] [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: 05/11/2023]
Abstract
The influence of artemin (AR) on herpes-related pain responses was examined using mice infected with herpes simplex virus (HSV). BALB/c mice were inoculated with HSV (1x10(6) plaque-forming units) on the right hind paw, while the contralateral hind paw was without inoculation. The changes in nociceptive threshold were examined using an electric Von Fray meter. Intraperitoneal administration of AR prevented a decrease in nociceptive threshold dose-dependently in HSV-inoculated mice, which was first observed at a dose of 1.0 mg/kg and peaked at doses higher than 1.5 mg/kg. This antinociceptive effect of AR attained peaks at 120 min after administration and declined gradually to non-treated levels by 270 min. Intraperitoneal administration of AR at a dose of 1.5 mg/kg scarcely affected beta-endorphin and noradrenaline levels in the central nervous system of HSV-inoculated mice. However, AR caused a significant decrease of the dynorphin levels in spinal cord. These results strongly suggest that AR exerts antinociceptive effects on herpes-related pain through changes of the dynorphin levels in the central nervous system of HSV-inoculated mice. It is also suggested that AR will be a good candidate as an antinociceptive drug for the treatment of acute herpetic pain in humans.
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Affiliation(s)
- Kazuhito Asano
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
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Shimizu T, Kanai K, Asano K, Hisamitsu T, Suzaki H. Suppression of matrix metalloproteinase production in nasal fibroblasts by tranilast, an antiallergic agent, in vitro. Mediators Inflamm 2006; 2005:150-9. [PMID: 16106101 PMCID: PMC1526475 DOI: 10.1155/mi.2005.150] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Allergic rhinitis is an inflammatory disease characterized by nasal wall remodeling with intense infiltration of eosinophils and mast cells/basophils. Matrix metalloproteinases (MMPs), MMP-2 and MMP-9, are the major proteolytic enzymes that induce airway remodeling. These enzymes are also important in the migration of inflammatory cells through basement membrane components. We evaluated whether tranilast (TR) could inhibit MMP production from nasal fibroblasts in response to tumor necrosis factor-alpha (TNF-alpha) stimulation in vitro. Nasal fibroblasts (NF) were established from nasal polyp tissues taken from patients with allergic rhinitis. NF (2 x 10(5) cells/mL) were stimulated with TNF-alpha in the presence of various concentrations of TR. After 24 hours, the culture supernatants were obtained and assayed for MMP-2, MMP-9, TIMP-1, and TIMP-2 levels by ELISA. The influence of TR on mRNA expression of MMPs and TIMPs in cells cultured for 12 hours was also evaluated by RT-PCR. TR at more than 5 x 10(-5) M inhibited the production of MMP-2 and MMP-9 from NF in response to TNF-alpha stimulation, whereas TIMP-1 and TIMP-2 production was scarcely affected. TR also inhibited MMP mRNA expression in NF after TNF-alpha stimulation. The present data suggest that the attenuating effect of TR on MMP-2 and MMP-9 production from NF induced by inflammatory stimulation may underlie the therapeutic mode of action of the agent in patients with allergic diseases, including allergic rhinitis.
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Affiliation(s)
- Toshiyuki Shimizu
- Department of Otolaryngology,
School of Medicine, Showa University, Tokyo 142-8666, Japan
| | - Kenichi Kanai
- Department of Otolaryngology,
School of Medicine, Showa University, Tokyo 142-8666, Japan
| | - Kazuhito Asano
- Department of Physiology, School
of Medicine, Showa University, Tokyo 142-8555, Japan
| | - Tadashi Hisamitsu
- Department of Physiology, School
of Medicine, Showa University, Tokyo 142-8555, Japan
| | - Harumi Suzaki
- Department of Otolaryngology,
School of Medicine, Showa University, Tokyo 142-8666, Japan
- * Harumi Suzaki;
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55
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Chen L, Gong S, Shan LD, Xu WP, Zhang YJ, Guo SY, Hisamitsu T, Yin QZ, Jiang XH. Effects of exercise on neurogenesis in the dentate gyrus and ability of learning and memory after hippocampus lesion in adult rats. Neurosci Bull 2006; 22:1-6. [PMID: 17684532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023] Open
Abstract
Objective To explore the effects of exercise on dentate gyrus (DG) neurogenesis and the ability of learning and memory in hippocampus-lesioned adult rats. Methods Hippocampus lesion was produced by intrahippocampal microinjection of kainic acid (KA). Bromodeoxyuridine (BrdU) was used to label dividing cells. Y maze test was used to evaluate the ability of learning and memory. Exercise was conducted in the form of forced running in a motor-driven running wheel. The speed of wheel revolution was regulated at 3 kinds of intensity: lightly running, moderately running, or heavily running. Results Hippocampus lesion could increase the number of BrdU-labeled DG cells, moderately running after lesion could further enhance the number of BrdU-labeled cells and decrease the error number (EN) in Y maze test, while neither lightly running, nor heavily running had such effects. There was a negative correlation between the number of DG BrdU-labeled cells and the EN in the Y maze test after running. Conclusion Moderate exercise could enhance the DG neurogenesis and ameliorate the ability of learning and memory in hippocampus-lesioned rats.
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Affiliation(s)
- Lin Chen
- Department of Neurobiology, School of Medicine, Soochow University, Suzhou 215123; Department of Physiology, School of Preclinic Medicine, Nanjing University of Traditional Chinese Medicine, Nanjing 210046, China; Department of Physiology, School of Medicine, Showa University, Tokyo 142-8555, Japan; E-mail: ;
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56
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Suzuki J, Goto N, Yanai T, Shibata M, Hisamitsu T. Morphometric comparison of human spinal cord anterior horn cells between the cervical and lumbar levels. Okajimas Folia Anat Jpn 2005; 82:43-7. [PMID: 16212275 DOI: 10.2535/ofaj.82.43] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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: 05/04/2023]
Abstract
Morphometric comparisons of anterior horn cells (AHCs) were conducted between cervical and lumbar spinal cords in 29 cadavers. The sizes of the AHCs were always larger at the lumbar level than at cervical level irrespective of the age of the spicemens, but a decrease in size with age was observed at both levels. The correlation coefficient shows a larger decrease in numbers and volumes at lumbar level than at cervical level.
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Affiliation(s)
- Jun Suzuki
- Department of physiology, Showa University School of Medicine, Shinagawa-ku, Tokyo, Japan
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57
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Xu S, Guo S, Jiang X, Umezawa T, Hisamitsu T. The role of norepinephrine and nitric oxide in activities of rat arginine vasopressin neurons in response to immune challenge. Neurosci Lett 2005; 383:231-5. [PMID: 15955417 DOI: 10.1016/j.neulet.2005.04.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 02/07/2005] [Revised: 03/25/2005] [Accepted: 04/06/2005] [Indexed: 11/20/2022]
Abstract
To explore the potential role of norepinephrine (NE) and nitric oxide (NO) in activities of rat hypothalamus arginine vasopressin (AVP) neurons in response to immune challenge, we observed the effect of prazosin, an antagonist of alpha1-adrenergic receptor, and the specific nitric oxide synthase (NOS) inhibitor N(w)nitro-L-arginine-methylester (L-NAME) on the Fos expression in AVP neurons induced by systemic lipopolysaccharide (LPS) using double immunohistochemistry. Intravenous (i.v.) injection of LPS induced Fos expression in AVP neurons mainly in the hypothalamus paraventricular nucleus (PVN) and in the supraoptic nucleus (SON). The percentage of Fos-positive AVP neurons was dose-dependent. Pretreatment with prazosin (5 mg/kg) effectively suppressed the Fos expression induced by LPS (5 microg/kg), whereas L-NAME (30 mg/kg) did not influence the Fos expression in the AVP neurons induced by LPS (0.25, 0.5, 1, 5 microg/kg). Our results suggest that the activation of central AVP neurons caused by systemic LPS may be mediated by NE through alpha1-adrenergic receptors, but could not be changed by NO.
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Affiliation(s)
- Shuang Xu
- Department of Physiology, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan
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58
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Aoki E, Kasahara T, Hagiwara H, Sunaga M, Hisamitsu N, Hisamitsu T. Electroacupuncture and moxibustion influence the lipopolysaccharide-induced TNF-alpha production by macrophages. In Vivo 2005; 19:495-500. [PMID: 15875767] [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: 05/02/2023]
Abstract
The purpose of this study was to evaluate the modifying effects of electroacupuncture (EA) and moxibustion (Mox) through the communication networks of the neuroimmune system using the two-step bacterial stimulation method. When EA or Mox treatment was implemented immediately following injection of the Streptococcus pyogenes preparation OK-432, a significant suppression of the tumor necrosis factor (TNF)alpha production by the peritoneal macrophages induced by lipopolysaccharide (LPS 1 microg/ml) was observed. When the stimulation with EA or Mox was reduced in volume, the degree of suppression decreased correspondingly. Naloxone antagonized to some extent the suppression of TNFalpha induced by EA, but did not compete with the suppression of TNFalpha release induced by Mox. These results suggest that activated macrophages are an important target of the immuno-suppressive effects of EA and Mox and that mu-opioid receptor-mediated mechanisms are responsible, to some extent, for the suppressive effect of EA, although Mox may not be dependent on these mechanisms.
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Affiliation(s)
- Eri Aoki
- Department of Physiology, School of Medicine, Showa University, 1-5-8, Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan
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59
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Zhu Q, Guo SY, Gong S, Yin QZ, Hisamitsu T, Jiang XH. Losartan blocks the excitatory effect of peripheral hypertonic stimulation on vasopressinergic neurons in hypothalamic paraventricular nucleus in rats: electrophysiological and immunocytochemical evidence. Neurosci Lett 2005; 380:12-6. [PMID: 15854742 DOI: 10.1016/j.neulet.2005.01.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [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: 11/12/2004] [Revised: 12/25/2004] [Accepted: 01/05/2005] [Indexed: 11/26/2022]
Abstract
The effect of peripheral hypertonic stimulation on the neurons of hypothalamic paraventricular nucleus (PVN) was investigated in the present study with both electrophysiological and immunocytochemical methods. The discharge frequency of the neurons with phasic activity in PVN could be increased by intraperitoneal (i.p.) injection of hypertonic saline (HS, 1.5M NaCl) (from 2.8 +/- 0.5 Hz to 5.4 +/- 0.9 Hz, P<0.001). The Fos expression in PVN could be enhanced (from 21.2 +/- 12.9 to 217.3 +/- 38.5 Fos-positive neurons, P<0.001) by i.p. HS and the majority of AVP-positive neurons expressing Fos (91.7 +/- 3.6%) was in magnocellular subdivision of PVN. After intracerebroventricular (i.c.v.) injection of losartan, angiotensin II type 1 (AT1) receptor antagonist (5 microg/microl), the excitatory effect of peripheral hypertonic stimulation on PVN neurons with phasic activity was inhibited significantly, and the number of the neurons co-expressing Fos and AVP in PVN decreased significantly (P<0.001) as well. The result demonstrated that the vasopressinergic neurons in PVN could be excited by peripheral hypertonic stimulation, and this excitation might be mediated by angiotensin II fibers projecting from subfornical organ to PVN.
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Affiliation(s)
- Qi Zhu
- Department of Neurobiology, School of Medicine, Soochow University, 48 Renmin Road, Suzhou 215007, PR China
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60
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Uchida J, Kanai K, Asano K, Watanabe S, Hisamitsu T, Suzaki H. Influence of fluticasone propionate on the production of vascular endothelial growth factor and basic fibroblast growth factor from nasal fibroblasts in vitro. In Vivo 2004; 18:767-70. [PMID: 15646818] [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: 05/01/2023]
Abstract
The influence of fluticasone propionate (FP) on vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) production from nasal polyp fibroblasts (NPFs) was examined in vitro. NPFs, at a density of 2.5 x 10(5) cells/ml, were stimulated with 25 ng/ml TNF-alpha in the presence or absence of FP for 24 h. FP at more than 10(-6) M could suppress VEGF production from NPFs. bFGF production induced by TNF-alpha stimulation was also suppressed by FP, when the agent was added to cell cultures at more than 10(-7) M. The present results also showed the suppressive activity of FP on mRNA expression for VEGF and bFGF, which were increased by TNF-alpha stimulation.
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Affiliation(s)
- Jun Uchida
- Department of Otolaryngology, School of Medicine, Showa University, Shinagawa-ku, Tokyo 142-8555, Japan
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61
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Namba M, Asano K, Kanai KI, Kyo Y, Watanabe S, Hisamitsu T, Suzaki H. Suppression of matrix metalloproteinase production from nasal fibroblasts by fluticasone propionate in vitro. Acta Otolaryngol 2004; 124:964-9. [PMID: 15513534 DOI: 10.1080/00016480310016947] [Citation(s) in RCA: 10] [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: 10/26/2022]
Abstract
OBJECTIVE To examine the influence of fluticasone propionate (FP) on matrix metalloproteinase (MMP) production from nasal polyp fibroblasts in vitro. MATERIAL AND METHODS Fibroblasts derived from five nasal polyps were stimulated with tumor necrosis factor (TNF)-alpha in the presence of various concentrations of FP. The influence of FP on MMP production was assessed by examining the levels of MMP-2 and -9 in culture supernatants using ELISA. We also examined the influence of FP on MMP mRNA expression using reverse transcriptase polymerase chain reaction. RESULTS The addition of FP caused significant suppression of MMP-2 and -9 production from nasal polyp fibroblasts in response to TNF-alpha stimulation. MMP mRNA expression was also suppressed by the addition of FP to cell cultures. The minimum concentration of the agent required to cause suppression was 10(-5) M. CONCLUSION These results suggest that the inhibitory action of FP on tissue remodeling may underlie the clinical efficacy of corticosteroids in nasal polyposis.
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Affiliation(s)
- Mayumi Namba
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo 142-8666, Japan
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Terao H, Asano K, Kanai KI, Kyo Y, Watanabe S, Hisamitsu T, Suzaki H. Suppressive activity of macrolide antibiotics on nitric oxide production by lipopolysaccharide stimulation in mice. Mediators Inflamm 2004; 12:195-202. [PMID: 14514469 PMCID: PMC1781621 DOI: 10.1080/09629350310001599620] [Citation(s) in RCA: 18] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND: Low-dose and long-term administration of macrolide antibiotics into patients with chronic airway inflammatory diseases could favorably modify their clinical conditions. However, the therapeutic mode of action of macrolides is not well understood. Free oxygen radicals, including nitric oxide (NO), are well recognized as the important final effector molecules in the development and the maintenance of inflammatory diseases. PURPOSE: The influence of macrolide antibiotics on NO generation was examined in vivo. METHODS: Male ICR mice, 5 weeks of age, were orally administered with either roxithromycin, clarithromycin, azithromycin or josamycin once a day for 2-4 weeks. The mice were then injected intraperitoneally with 5.0 mg/kg lipopolysaccharide (LPS) and the plasma NO level was examined 6 h later. RESULTS: Although pre-treatment of mice with macrolide antibiotics for 2 weeks scarcely affected NO generation by LPS injection, the administration of macrolide antibiotics, except for josamycin, for 4 weeks significantly inhibited LPS-induced NO generation. The data in the present study also showed that pre-treatment of mice with macrolide antibiotics for 4 weeks significantly suppresses not only production of pro-inflammatory cytokines interleukin-1beta, interleukin-6, and tumor necrosis factor-alpha, but also inducible nitric oxide synthase mRNA expressions, which are enhanced by LPS injection. CONCLUSION: These results strongly suggest that suppressive activity of macrolide antibiotics on NO generation in response to LPS stimulation in vivo may, in part, account for the clinical efficacy of macrolides on chronic inflammatory diseases.
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Affiliation(s)
- Hajime Terao
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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63
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Abstract
It is well known that low-dose and long-term administration of macrolide antibiotics favourably modify the clinical status of chronic airway inflammatory diseases. However, the therapeutic mode of action of macrolide antibiotics is not well understood. The present study aimed to examine the influence of macrolide antibiotics, roxithromycin (RXM) and josamycin (JM) on matrix metalloproteinase (MMP) production from nasal polyp fibroblasts (NPF) in vitro. NPF, at a concentration of 2.5 x 10(5) cells x mL(-1), were stimulated with tumour necrosis factor (TNF)-alpha in the presence of various concentrations of RXM or JM for 24 h. MMP-2 and -9 levels in culture supernatants were analysed by ELISA, and MMP mRNA expression was examined by RT-PCR. The influence of RXM on nuclear factor (NF)-kappaB and activator protein (AP)-1 activation was also examined. Addition of RXM (but not JM) at 5.0 and 7.5 microg x mL(-1) significantly suppressed the production of MMP-2 and -9 from NPF induced by TNF-alpha stimulation. RXM also suppressed MMP mRNA expression through the inhibition of NF-kappaB and AP-1 activation. The present results suggest that the suppressive activity of roxithromycin on MMP-2 and -9 production is, in part, responsible for the therapeutic action of macrolides on chronic airway inflammatory diseases.
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Affiliation(s)
- K Kanai
- Dept of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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64
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Jiang XH, Guo SY, Xu S, Yin QZ, Ohshita Y, Naitoh M, Horibe Y, Hisamitsu T. Sympathetic nervous system mediates cold stress-induced suppression of natural killer cytotoxicity in rats. Neurosci Lett 2004; 358:1-4. [PMID: 15016420 DOI: 10.1016/j.neulet.2003.11.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 10/01/2003] [Revised: 11/02/2003] [Accepted: 11/04/2003] [Indexed: 10/26/2022]
Abstract
The aim of the present study is to investigate the mechanisms of suppression of splenic natural killer (NK) cytotoxicity caused by cold stress, using 6-hydroxydopamine (6-OHDA) as chemical sympathectomy. The NK activity was measured by (51)chromium release assay. Central sympathectomy with intracerebroventricular injection of 6-OHDA significantly reduced the elevation of the plasma corticosterone level, the expression of Fos in hypothalamic paraventricular nucleus and in locus coeruleus, as well as the suppression of NK activity induced by cold stress at 4 degrees C for 4 h. Peripheral sympathectomy with intraperitoneal (i.p.) injection of 6-OHDA and blockade of beta-adrenergic receptor with i.p. injection of propranolol also reversed the cold stress-induced suppression of NK cytotoxicity, but without significant effect on Fos expression in the brain. The results suggest that the activation of the hypothalamic-pituitary-adrenal axis induced by cold stress might be mediated, at least partially, by the central noradrenergic system, and that the cold stress-induced suppression of NK cytotoxicity might be mediated by the activation of the peripheral sympathetic nerve.
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Affiliation(s)
- Xing-Hong Jiang
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan
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65
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Jiang XH, Guo SY, Xu S, Yin QZ, Ohshita Y, Naitoh M, Horibe Y, Hisamitsu T. Sympathetic nervous system mediates cold stress-induced suppression of natural killer cytotoxicity in rats. Neurosci Lett 2004; 357:1-4. [PMID: 15036599 DOI: 10.1016/j.neulet.2003.11.075] [Citation(s) in RCA: 9] [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] [Received: 10/01/2003] [Revised: 11/02/2003] [Accepted: 11/04/2003] [Indexed: 10/26/2022]
Abstract
The aim of the present study is to investigate the mechanisms of suppression of splenic natural killer (NK) cytotoxicity caused by cold stress, using 6-hydroxydopamine (6-OHDA) as chemical sympathectomy. The NK activity was measured by (51)chromium release assay. Central sympathectomy with intracerebroventricular (i.c.v.) injection of 6-OHDA reduced significantly the elevation of plasma corticosterone level, the expression of Fos in hypothalamic paraventricular nucleus and in locus coeruleus, as well as the suppression of NK activity induced by cold stress at 4 degrees C for 4 h. Peripheral sympathectomy with intraperitoneal (i.p.) injection of 6-OHDA and blockade of beta-adrenergic receptor with i.p. injection of propranolol also reversed the cold stress-induced suppression of NK cytotoxicity, but without significant effect on Fos expression in brain. The results suggest that the activation of hypothalamic-pituitary-adrenal axis induced by cold stress might be mediated, at least partially, by central noradrenergic system, and that the cold stress-induced suppression of NK cytotoxicity might be mediated by the activation of peripheral sympathetic nerve.
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Affiliation(s)
- Xing-Hong Jiang
- Laboratory of Neurobiology, School of Medicine, Soochow University, Suzhou 215007, P.R. China
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66
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Kanai KI, Asano K, Hisamitsu T, Suzaki H. Suppression of matrix metalloproteinase-9 production from neutrophils by a macrolide antibiotic, roxithromycin, in vitro. Mediators Inflamm 2004; 13:313-9. [PMID: 15770046 PMCID: PMC1781582 DOI: 10.1080/09629350400008810] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [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: 10/26/2022] Open
Abstract
BACKGROUND Macrolide antibiotics such as erythromycin and roxithromycin (RXM) have an anti-inflammatory effect that may account for their clinical benefit in the treatment of chronic airway inflammatory diseases. However, the precise mechanism of this anti-inflammatory effect is not well understood. PURPOSE The influence of RXM on matrix metalloproteinase (MMP)-9 production from neutrophils in response to lipopolysaccharide (LPS) stimulation was examined in vitro. METHODS Neutrophils prepared from normal human peripheral blood (1 x 10(5) cells/ml) were treated with various concentrations of RXM for 1 h, and then stimulated with 1.0 microg/ml of LPS in the presence of the agent for 24 h. MMP-9 and tissue inhibitor of metalloproteinase (TIMP)-1 levels in culture supernatants were examined by enzyme-linked immunosorbent assay. RESULTS Addition of RXM at more than 5.0 microg/ml into cell cultures caused significant suppression of MMP-9 production, which was increased by LPS stimulation. However, the ability of cells to produce TIMP-1 was not affected by RXM treatment, even when the cells were cultured in the presence of agent at 10.0 microg/mL We then examined the influence of RXM on transcriptional factor, nuclear factor-kappaB and activator protein (AP)-1 activation by LPS stimulation. RXM exerted suppressive action on NF-kappaB (P50 and P65) activation when the cells were cultured for 4 h at more than 5.0 microg/ml of the agent. RXM at more than 2.5 microg/ml also suppressed AP-1 (Fra 1 and Jun B) activation in 4-h cultured cells. We finally examined the influence of RXM on MMP-9 mRNA expression in neutrophils. Addition of RXM into cell cultures at more than 5.0 microg/ml caused significant inhibition of mRNA expression, which was enhanced by LPS stimulation for 12 h. CONCLUSION These results strongly suggest that RXM inhibits neutrophil transmigration into inflammatory sites and results in favorable modification of the clinical status of inflammatory diseases.
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Affiliation(s)
- Ken-Ichi Kanai
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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67
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Asano K, Kamakazu K, Hisamitsu T, Suzaki H. Suppressive activity of macrolide antibiotics on nitric oxide production from nasal polyp fibroblasts in vitro. Acta Otolaryngol 2003; 123:1064-9. [PMID: 14710909 DOI: 10.1080/00016480310002519] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The influence of macrolide antibiotics on nitric oxide (NO) generation was examined using human nasal polyp fibroblasts (NPFs) in vitro. Addition of roxithromycin (RXM) at a concentration of > 7.5 microg/ml to cell cultures was shown to suppress NO production in response to stimulation with 25.0 ng/ml tumor necrosis factor (TNF)-alpha. However, jyosamycin (JM) did not suppress NO production from NPFs induced by TNF-alpha stimulation in vitro, even when added to cell cultures at a concentration of 20.0 microg/ml. We then examined the influence of RXM on inducible nitric oxide synthase (iNOS) mRNA expression in NPFs. Addition of RXM at a dose of 7.5 microg/ml to cell cultures caused reduction of iNOS mRNA expression, which was enhanced by TNF-alpha stimulation in vitro.
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Affiliation(s)
- Kazuhito Asano
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
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68
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Abstract
OBJECTIVE To examine the possible mechanisms underlying the therapeutic mode of action of glucocorticoids (GCs) in nasal polyposis. MATERIAL AND METHODS The effects of GCs on nasal polyps were firstly evaluated by examining the growth of fibroblasts derived from 10 nasal polyps in vitro. Subsequently, the ability of GCs to induce apoptotic cell death in fibroblasts was examined. RESULTS Addition of betamethasone 21-phosphate (BET) at a concentration of > 1 x 10(-3) M to cell cultures inhibited cell growth in all cases examined. BET and dexamethasone 21-phosphate, but not testosterone or estradiol, caused apoptotic cell death in 2/10 nasal polyp fibroblasts, as assessed by agarose gel electrophoresis, when the cells were cultured with the agents for > 96 h. The minimum concentration of agent needed to cause apoptosis was 1 x 10(-3) M, which is half of the recommended therapeutic dose. CONCLUSION The present findings suggest that topical application of GCs in nasal polyposis patients suppresses proliferation of fibroblasts in polyps and results in favorable modification of the clinical status of these patients.
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Affiliation(s)
- Sumiko Hirano
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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69
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Abstract
Clonidine, an alpha(2)-adrenoceptor agonist, has been reported to inhibit gastric and small intestinal motility in rats. Whether clonidine also inhibits colonic motility is still not clear. The aim of this study was to examine the effect of clonidine on colonic motility and its possible site of action in adult Wistar rats. Colonic motilities in anesthetized rats in vivo or motilities of the isolated colon of rats in vitro were recorded. Clonidine was administered intravenously (i.v.) and intracerebroventricularly (i.c.v.) in vivo while bath administration was used in in vitro study. Clonidine i.v. or i.c.v. significantly inhibited colonic motility. This inhibitory effect was antagonized by pre-administration of yohimbine, an alpha(2)-adrenoceptor antagonist, but not by pre-administration of prazosin, an alpha(1)-adrenoceptor antagonist. Also, we have unpublished data indicating that the sympathectomy antagonized the inhibitory effect of systemically administered clonidine. A significant depression of colonic motility on the isolated colon was induced by bath administration of noradrenaline, while no such inhibition was seen by clonidine. The results of the present study suggested that clonidine inhibits colonic motility in rats through activation of central alpha(2)-adrenergic receptor.
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Affiliation(s)
- Teruyasu Umezawa
- Department of Physiology, School of Medical Sciences, Showa University, Hatanodai 1-5-8, Shinagawa, Tokyo 142-8555, Japan
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70
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Kamakazu K, Mizutani T, Sahara M, Hisamitsu T, Suzaki H. The effect of a glucocorticoid on olfactory response of isolated mouse olfactory cells. In Vivo 2003; 17:343-7. [PMID: 12929589] [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: 03/04/2023]
Abstract
Oral administration and nasal instillation of glucocorticoids are currently being conducted and are producing satisfactory results for the treatment of olfactory dysfunctions. However, there are still many unanswered questions about the actions of glucocorticoids on the olfactory cells. In the present study, the effects of glucocorticoids on the olfactory response in mouse olfactory cells were examined by measuring changes in the intracellular Ca2+ concentration. The olfactory cells isolated from the BALB/c female mouse mucosa were stained with a Fura-2/AM and the changes in the intracellular Ca2+ concentration were observed by using a fluorescent microscopic image processing device, ARGUS50. The cells were exposed to the following olfactory stimuli, 3-ethoxy-4-hydroxy-benzaldehyde, caprylic acid, nonanoic acid, phenethyl alcohol and n-amyl acetate. When 0.1 and 0.01% betamethasone was applied to the olfactory cells for short periods(1 or 3 minutes), no changes were observed. However, long-term(7 minutes) application of 0.1 and 0.01% (but not 0.001 and 0.0001%) betametathone significantly decreased intracellular Ca2+ concentration, which was increased by olfactory stimulation. The inhibitory effect of betamethasone on Ca2+ influx into olfactory cells was attenuated by pre-treatment olfactory cells with RU486, a glucocorticoid receptor antagonist.
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Affiliation(s)
- Kiyoaki Kamakazu
- Department of Otorhinolaryngology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawaku, Tokyo, 142-8666, Japan
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71
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Abstract
The influence of macrolide antibiotics, roxithromycin (RXM) and josamycin (JM) on inflammatory cytokine production from human nasal polyp fibroblasts (NPFs) was examined using an in vitro cell culture technique. Addition of RXM at a concentration of 10.0 microg/ml to cell cultures suppressed both IL-6 and RANTES (but not IL-8) production in response to stimulation with 25.0 ng/ml tumor necrosis factor (TNF)-alpha. However, JM could not suppress IL-6, IL-8 and RANTES production from NPFs induced by TNF-alpha stimulation in vitro, even when added to cell cultures at a concentration of 20.0 microgram/ml. In the second part of the study, we examined the influence of RXM on cytokine mRNA expression in NPFs. Addition of RXM at a concentration of 10.0 mg/ml to cell cultures caused reduction of the mRNA expressions of both IL-6 and RANTES, which were enhanced by TNF-alpha stimulation in vitro.
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Affiliation(s)
- Harumi Suzaki
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan.
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72
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Xu S, Guo S, Jiang X, Yin Q, Umezawa T, Hisamitsu T. Effect of indomethacin on the c-fos expression in AVP and TH neurons in rat brain induced by lipopolysaccharide. Brain Res 2003; 966:13-8. [PMID: 12646303 DOI: 10.1016/s0006-8993(02)04000-3] [Citation(s) in RCA: 30] [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] [Indexed: 11/30/2022]
Abstract
The aim of the present study was to investigate the effect of indomethacin on the Fos expression in arginine vasopressin (AVP)-containing neurons in the hypothalamus and tyrosine hydroxylase (TH)-containing neurons in the locus coeruleus (LC) using dual-labeled immunohistochemistry. In the hypothalamus, intraperitoneal (i.p) injection of different doses [2.5 microg/100 g, 125 microg/100 g body weight (b.w.)] of lipopolysaccharide (LPS) induced a significant Fos expression in AVP neurons in the supraoptic nucleus (SON), the magnocellular division (mPVN) and the parvocellular division (pPVN) of the paraventricular nucleus (PVN). Pretreatment with the cyclooxygenase inhibitor indomethacin (0.8 mg/100 g b.w.) significantly blocked the Fos expression in these AVP neurons induced by a low dose of LPS (2.5 microg/100 g) but had no effect on the Fos expression induced by a high dose of LPS (125 microg/100 g). Similarly, in the brain stem, a large number of TH-positive neurons in the LC expressed Fos after administration of either dose of LPS. Indomethacin prevented the Fos expression induced only by a low dose of LPS, but not by a high dose of LPS. These results suggest that the activation of AVP neurons in PVN and SON and TH neurons in LC response to immune challenge might be mediated-at least partially-by prostaglandins.
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Affiliation(s)
- Shuang Xu
- Department of Physiology, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
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73
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Jiao YY, Guo SY, Umezawa T, Okada M, Hisamitsu T. The sympathetic nervous system is involved in the inhibitory effect of morphine on the colon motility in rats. Auton Neurosci 2002; 100:27-31. [PMID: 12422957 DOI: 10.1016/s1566-0702(02)00137-6] [Citation(s) in RCA: 11] [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: 11/26/2022]
Abstract
The role of the sympathetic nervous system in the inhibitory effect of morphine on colonic motility was investigated in male adult Wistar rats. The responses of colonic motility and blood pressure to the intravenous administration of morphine under urethane anesthesia were recorded. Sympathectomy (6-hydroxydopamine) or pretreatment with phentolamine, an alpha-adrenoreceptor antagonist (3.15 microM/kg, i.v.), or propranolol, a beta-adrenoreceptor antagonist (3.38 microM/kg, i.v.), on the inhibitory effect of intravenously administered morphine on colonic motility were observed. The results of the investigation showed that a significant depression of colonic motility occurred in untreated rats following intravenous administration of morphine, while no significant effect was seen in the sympathectomized. Pretreatment with phentolamine or propranolol also significantly attenuated the depression of colonic motility induced by morphine. Morphine also produced a transient depression of the blood pressure. However, this inhibitory effect of morphine on blood pressure was intensified after sympathectomy or pretreatment with either phentolamine or propranolol. We conclude that sympathetic activity plays an important role in the inhibitory effects of morphine on colonic motility and that both alpha- and beta-adrenoreceptors are involved.
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Affiliation(s)
- Yong Y Jiao
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan
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74
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75
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Suzuki M, Asano K, Yu M, Hisamitsu T, Suzaki H. Inhibitory action of a macrolide antibiotic, roxithromycin, on co-stimulatory molecule expressions in vitro and in vivo. Mediators Inflamm 2002; 11:235-44. [PMID: 12396475 PMCID: PMC1781671 DOI: 10.1080/0962935029000096] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE The influence of a macrolide antibiotic, roxithromycin (RXM), on co-stimulatory molecule expression was examined in vitro and in vivo. MATERIALS AND METHODS Spleen cells obtained from BALB/c mice 10 days after immunization with 8.0 microg of hemocyanin absorbed to 4.0 mg of aluminum hydroxide were cultured in the presence of 100.0 microg/ml of hemocyanin and various concentrations of RXM. We first examined the influence of RXM on cell activation by examining the proliferative response of cells and cytokine production. We also examined the influence of RXM on co-stimulatory molecule (CD40, CD80 and CD86) expressions on cultured splenic B-lymphocytes induced by in vitro antigenic stimulation using flow cytometry. In the second part of experiments, non-immunized and immunized mice were treated orally with 2.5 mg/kg of RXM once a day for 4 or 8 weeks. Splenic B lymphocytes were obtained from these mice 24 h after antigenic challenge, and co-stimulatory molecule expressions were examined by flow cytometer. RESULTS Cell activation induced by in vitro antigenic stimulation was suppressed by RXM when cells were cultured in the presence of more than 5.0 microg/ml of the agent. Addition of RXM at a concentration of 5.0 microg/ml into cell cultures also suppressed co-stimulatory molecule (CD40, CD80 and CD86) expressions on splenic B lymphocytes, which was enhanced by antigenic stimulation in vitro. Oral RXM administration for 4 weeks clearly suppressed the enhancement of CD40 and CD86 (but not CD80) expressions on splenic B lymphocytes induced by antigenic stimulation in vivo. This suppressive activity of RXM on co-stimulatory molecule (CD40 and CD86) expressions was further strengthened by the treatment of mice for 8 weeks. Long-term treatment with oral RXM also suppressed CD80 expressions, which was not suppressed by 4-week treatment. CONCLUSION The present results suggest that RXM exerts its immunomodulating effects through suppression of both cell activation and co-stimulatory molecule expressions induced by antigenic stimulation. These suppressive activities of RXM might contribute, in part, to the therapeutic mode of action of RXM on inflammatory diseases.
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Affiliation(s)
- Mayumi Suzuki
- Department of Otolaryngology, School of Medicine, Showa University, Shinagawa-ku, Tokyo 142-8555, Japan
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76
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Sugimoto K, Watanabe T, Sahara M, Ueda T, Hisamitsu T, Koide R. [Vasodilatory action of FK 409 on bovine retinal arteries--analysis by a microvessel perfusion system]. Nippon Ganka Gakkai Zasshi 2002; 106:338-42. [PMID: 12138695] [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] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
PURPOSE We investigated the vasodilatory action of FK 409 on bovine retinal arteries using a microvessel perfusion system in vitro. MATERIALS AND METHODS Bovine retinal arteries were obtained from bovine eyes. The arteries, 3 mm long and 110 microns in diameter, were attached to the microvessel perfusion system. The arteries were perfused with Tyrode solution containing 10(-6) M U46619, followed by 10(-6) M U46619 and FK 409 (10(-3) M or 10(-4) M). We also perfused the arteries with carboxy-2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide. The inner diameter of the arteries was measured under a microscope and analyzed by computer. RESULTS FK 409 prevented contraction of bovine retinal arteries induced by perfusion of 10(-6) M U46619 when the arteries were perfused with 10(-3) to 10(-4) M FK 409. Addition of 100 microM PTIO, an nitric oxide (NO)-specific extinction agent, into the mixture of U46619 and FK 409 hadan antagonistic effect on the contractive action of FK 409. CONCLUSION These results suggest that FK 409 has a dilatational effect on bovine retinal arteries and that the dilatational action of FK 409 is possibly produced by NO.
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Affiliation(s)
- Kayo Sugimoto
- Department of Physiology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan
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77
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Abstract
BACKGROUND Long-term administration of macrolide antibiotics is recognized to be able to favorably modify the clinical condition of inflammatory diseases, such as diffuse panbronchiolitis and cystic fibrosis. However, the precise mechanisms by which macrolide antibiotics could improve clinical conditions of the patients are not well understood. AIM The present study was designed to examine the influence of macrolide antibiotics on effector cell functions responsible for inflammation through the choice of roxithromycin (RXM) and mast cell. METHODS Mast cells were induced by long-term culture of splenocytes from BALB/c mice. RXM was added to the cultures at seeding and then every 4-5 days, when the culture medium was replaced with a fresh one. The influence of RXM on mast cell growth was evaluated by counting the number of cells grown on the 16th day. We also examined the influence of RXM on mast cell activation by examining histamine release and inflammatory cytokine secretion. RESULTS AND CONCLUSION RXM could not inhibit mast cell growth, even when splenocytes were exposed to 100 microg/ml of RXM throughout the entire culture periods. RXM also could not suppress histamine release from cultured mast cells in response to non-immunological and immunological stimulations. However, RXM could suppress inflammatory cytokine, interleukin-1beta, interleukin-6, granulocyte macrophage-colony stimulating factor and tumor necrosis factor-alpha, secretions induced by concanavalin A stimulation at a concentration of as little as 0.5 microg/ml. These results may suggest that RXM modulated the ability of mast cells to secrete inflammatory cytokines and results in improvement of clinical condition of chronic inflammatory diseases.
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Affiliation(s)
- T Shimane
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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78
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Li ZH, Shan LD, Jiang XH, Guo SY, Yu GD, Hisamitsu T, Yin QZ. Analgesic effect of endomorphin-1. Acta Pharmacol Sin 2001; 22:976-80. [PMID: 11749786] [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: 02/23/2023] Open
Abstract
AIM To study the analgesic effect of endomorphin-1 (EM-1). METHODS The experiment was performed in rats and mice to study the analgesic effect of intraperitoneal (ip) injection of EM-1 with tail stimulation-vocalization test, writhing test, adjuvant arthritis, and neuropathic pain model and to compare it with the analgesic effects produced by intracerebroventricular (icv) and intrathecal (it) administrations. RESULTS 1) EM-1 raised the pain threshold dose-dependently in tail stimulation-vocalization test in rats and inhibited the writhing responses induced by ip acetic acid in mice. EM-1 also decreased the hyperalgesia in both adjuvant arthritis and neuropathic pain model. 2) The analgesic effect induced by central (icv and it) administration of EM-1 was faster and more powerful than that induced by peripheral (ip) administration. 3) The analgesic effect of EM-1 was reversed by naloxone (opioid receptor antagonist), as well as by cyprodime (mu-opioid receptor selective antagonist). Repeated administrations of EM-1 induced tolerance. CONCLUSION EM-1 had a definite analgesic effect and the analgesic effect of EM-1 was mediated by central mu-opioid receptor.
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Affiliation(s)
- Z H Li
- Department of Physiology, School of Medicine, Showa University, Tokyo 142, Japan
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79
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Hisamitsu T, Ohata H, Kawanishi T, Iwamoto T, Shigekawa M, Amano H, Yamada S, Momose K. A mechanism of Ca2+ release from Ca2+ stores coupling to the Na+/Ca2+ exchanger in cultured smooth muscle cells. Life Sci 2001; 69:2775-87. [PMID: 11720082 DOI: 10.1016/s0024-3205(01)01351-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 10/17/2022]
Abstract
We previously observed Ca2+ release from intracellular Ca2+ stores caused by reduction in extracellular Na+ concentration ([Na+]o). The purpose of this study was to determine whether lowering [Na+]o can elicit Ca2+ release from Ca2+ stores via the Na+/Ca2+ exchanger and to elucidate the mechanisms related to the Ca2+ release pathway in cultured longitudinal smooth muscle cells obtained from guinea pig ileum. Low [Na+]o-induced Ca2+ release was inhibited by antisense oligodeoxynucleotides for Na+/Ca2+ exchanger type 1 (anti-NCX). Application of anti-NCX to cells attenuated both the number of Ca2+ responding cells and the expression of the exchanger. Moreover, microinjection of heparin, a blocker of inositol 1,4,5-trisphosphate (IP3) receptors, into the cells inhibited low [Na+]o-induced Ca2+ release. These findings suggest that low [Na+]o-induced Ca2+ release occurs through an IP3-induced Ca2+ release mechanism due to changes in the Ca2+ flux regulated by the Na+/Ca2+ exchanger.
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Affiliation(s)
- T Hisamitsu
- Department of Pharmacology, School of Pharmaceutical Science, Showa University, Shinagawa, Tokyo, Japan.
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80
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Asano K, Kamakazu K, Hisamitsu T, Suzaki H. Modulation of Th2 type cytokine production from human peripheral blood leukocytes by a macrolide antibiotic, roxithromycin, in vitro. Int Immunopharmacol 2001; 1:1913-21. [PMID: 11606023 DOI: 10.1016/s1567-5769(01)00116-3] [Citation(s) in RCA: 19] [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: 11/23/2022]
Abstract
The influence of a macrolide antibiotic, roxithromycin (RXM), on Th1 and Th2 cytokine productions from human peripheral blood T cells was examined under stimulation with co-stimulatory molecules. Peripheral blood T cells prepared from both healthy and allergic rhinitis donors were cultured in the presence of RXM on anti-CD3 mAb and anti-CD26 mAb-coated wells, anti-CD3 mAb and anti-CD28 mAb-coated wells, and anti-CD3 and PMA. T-cell proliferation, along with the concentration of interleukin (IL)-2, interferon (IFN)-gamma, IL-4 and IL-5 were measured. RXM did not affect T-cell proliferation induced by several ways of co-stimulatory activation as assessed by 3H-thymidine incorporation into DNA. RXM also had no effect on IL-2 and IFN-gamma secretion by T cells prepared from both healthy and allergic rhinitis donors. On the other hand, RXM markedly inhibited both IL-4 and IL-5 secretions under each of the co-stimulatory conditions in a dose-dependent manner. These results indicate that RXM inhibits specifically Th2 cytokine secretion from T cells induced by co-stimulatory molecule stimulations. This inhibitory action of RXM may be partially responsible for attenuating effect of the agent on the inflammatory diseases.
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Affiliation(s)
- K Asano
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
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81
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Abstract
The influence of roxithromycin (RXM), a macrolide antibiotic, on endogenous corticosterone (CS) levels was examined in BALB/c mice. Mice were sensitized intraperitoneally with two doses of Keyhole Limpet Hemocyanin at 1 week intervals. Mice were given orally 2.5 mg/kg RXM once a day for 14 days starting 7 days after the first sensitization. RXM administration caused markedly increase in endogenous plasma CS levels which was peaked at 60 min after the administration. However, josamycin did not influence on endogenous CS levels in plasma. Injection of dexamethasone inhibits the plasma CS hyperproduction induced by RXM treatment.
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Affiliation(s)
- S Yamamoto
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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82
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Sunagawa M, Okada M, Guo SY, Hisamitsu T. [Effectiveness of Saiko-Keishi-To (TJ-10, a Kampo herbal medicine) for trigeminal neuralgia in rats]. Masui 2001; 50:486-90. [PMID: 11424461] [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] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
It is known that Saiko-Keishi-To (TJ-10), a Kampo herbal medicine used for the treatment of epilepsy, shows a satisfactory curative effect even in the patients suffering from trigeminal neuralgia. To verify the effectiveness of TJ-10, Wistar rats with chronic neuralgia of the mandibular nerve were prepared and TJ-10 was administered to them for 4 weeks following the manifestation of pain in the mandibular region. The result reveals that the rise in the pain threshold in the mandibular region is more significant in the rats administered TJ-10 than in those in the control group. However, in the tail flick test, no significant change was observed in the pain threshold. These findings suggest that TJ-10 is effective for controlling the manifestation of pain in ligatured nerves, by local effect, not by general analgesic effect.
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Affiliation(s)
- M Sunagawa
- Department of Physiology, School of Medicine, Showa University, Tokyo 142-8555
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83
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Yu GD, Liu YL, Jiang XH, Guo SY, Zhang HQ, Yin QZ, Hisamitsu T. The inhibitory effect of serotonin on the spontaneous discharge of suprachiasmatic neurons in hypothalamic slice is mediated by 5-HT(7) receptor. Brain Res Bull 2001; 54:395-8. [PMID: 11306191 DOI: 10.1016/s0361-9230(00)00462-7] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The effects of serotonin (5-HT) receptor agonists and antagonists on the spontaneous discharge of suprachiasmatic nucleus (SCN) neurons were investigated using rat hypothalamic slice. It was found that: (1) the SCN neurons showed a persistent rhythm in the spontaneous discharge rate, which was higher during the light phase than during the dark phase; (2) the effects of 5-HT on SCN neurons was inhibitory in nature and the sensitivity of SCN neurons to 5-HT during the light phase was lower than that during the dark phase; (3) both 5-HT and 5-HT(1/7) receptor agonist, (+/-)-8-hydroxy-2-(DL-N-propylamino) tetralin hydrobromide, could inhibit the spontaneous discharge of SCN neurons. This inhibitory effect could be blocked by 5-HT(2/7) receptor antagonist ritanserin and putative 5-HT(7) receptor antagonists clozapine, but neither by selective 5-HT(2) receptor antagonist ketanserin, nor by 5-HT(1) receptor antagonist pindolol. It was suggested that the inhibitory effect of 5-HT on the spontaneous discharge of SCN neurons in rat hypothalamic slice is mediated by 5-HT(7) receptor subtype.
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Affiliation(s)
- G D Yu
- Laboratory of Neurobiology, School of Medicine, Soochow University, Suzhou, People's Republic of China
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84
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Shimane T, Asano K, Mizutani T, Hisamitsu T, Suzaki H. [Effects of roxithromycin on experimental otitis media]. Jpn J Antibiot 2001; 54 Suppl A:132-5. [PMID: 11439892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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85
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Yamamoto S, Asano K, Shimane T, Seto H, Hisamitsu T, Suzaki H. [Enhancement of glucocorticoid production by roxithromycin]. Jpn J Antibiot 2001; 54 Suppl A:157-60. [PMID: 11439898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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86
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Mizutani T, Sahara M, Kamakazu K, Hisamitsu T, Suzaki H. [Intracellular calcium kinetics after odorant stimulus in olfactory receptor cells isolated from mice]. Nihon Jibiinkoka Gakkai Kaiho 2000; 103:1292-9. [PMID: 11197816 DOI: 10.3950/jibiinkoka.103.1292] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
cAMP and IP3 act as secondary messengers in olfactory signal transduction and when activated, stimulate calcium levels in olfactory receptor cells. Little is known however, about the causal mechanism. We studied calcium kinetics in mouse olfactory receptor cells after odorant stimuli. Olfactory receptor cells were isolated from female BALB/c mice, treted with trypsin, and stained with Fura-2/AM. Changes in intracellular Ca2+ concentrations in stained cells were measured with a fluorescent microscopic image-processing device (ARGUS-50; Hamamatsu Photonix, Japan). We found that intracellular Ca2+ concentrations rose after exposure to a set of odorants, including 3-ethoxy-4-hydroxy-benzaldehyde, caprylic acid, heptanoic acid, nonanoic acid, eugenol, phenethyl alcohol, and n-amyl acetate. Adding 2', 5'-dideoxyadenosine, a cAMP inhibitor, beforehand suppressed olfactory receptor cell response to odorants. Intracellular Ca2+ concentrations increased substantially in response to stimulation by odorants in calcium-free Ringer's solution, but only a slight increase was seen in intracellular calcium concentration in response stimulation by a high concentration of K+ (145.6 mM) in calcium-free Ringer's solution. The increase in intracellular Ca2+ concentration after odorant stimuli was suppressed when olfactory receptor cells were pretreated with ryanodine, which releases Ca2+ from intracellular stores. These findings suggest that elevated Ca2+ concentrations may be involved in releasing Ca2+ from intracellular calcium stores in mouse olfactory receptor cells, in which cAMP functions as a secondary messenger in olfactory signal transduction.
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Affiliation(s)
- T Mizutani
- Department of Otorhinolaryngology, Showa University, Tokyo
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87
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Sunagawa M, Okada M, Guo SY, Hisamitsu T. [Splenic natural killer cell activity is suppressed by ligation of unilateral mental nerve in rats]. Masui 2000; 49:250-4. [PMID: 10752316] [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] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
It has been reported that surgical procedures and postoperative pain suppress immune activities of the patient. But it is not clear if chronic pain in a small area affects immune activities. We prepared rats with chronic neuralgia of the mental branch originating from the mandibular nerve (a division of the trigeminal nerve) and examined the change of splenic NK-cell activity. Surgical procedures to prepare rat models for the study were as follows: one mental nerve was exposed and ligated at the mental foramen in order to create hypersensitivity in the ipsilateral innervated area. Splenic NK-cell activity 3 weeks after the surgery was reduced significantly in the operation group than that of the sham-operation group and the non-operated control group. The result suggests that the immune functions are remarkably affected by chronic pain evoked in a limited area such as the area innervated by the mental nerve.
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Affiliation(s)
- M Sunagawa
- Department of Physiology, School of Medicine, Showa University, Tokyo
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88
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Asano K, Mizutani T, Shimane T, Hisano M, Hisamitsu T, Suzaki H. The inhibitory effect of anti-allergic agent suplatast tosilate (IPD-1151T) on methacholine- and allergen-induced bronchoconstriction in sensitized mice. asakazu@med.showa-u.dc.jp. Mediators Inflamm 2000; 9:77-84. [PMID: 10958380 PMCID: PMC1781752 DOI: 10.1080/096293500411532] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
The influence of an anti-allergic agent, suplatast tosilate (IPD-1151T; (+/-)-[2-[4-(3-ethoxy-2-hydroxypropoxy)phenyl-carbamoyl]-ethyl] dimethylsulfonium p-toluenesulfonate) on allergic bronchoconstriction induced by allergen and methacholine (MCh) were examined in mice. BALB/c mice were sensitized by intraperitoneal injection of dinitrophenylated-keyhole limpet hemocyanin (DNP-KLH) mixed with A1(OH)3 (DNP-KLH). IPD-1151T was administered orally once a day for either 5 or 14 days in doses of 10, 30 or 100 mg/kg. Bronchoconstriction was measured 24h after the final drug administration. IPD-1151T inhibited both antigen- and MCh-mediated bronchoconstriction in actively sensitized mice. The inhibition induced was closely related to the dose and frequency of oral administration of the agent. We also examined the effect of IPD-1151T on IgE production in response to DNP-KLH immunization. IPD-1151T inhibited dose-dependently both total and specific IgE concentrations in serum prepared from mice 15 days after immunization. These results strongly indicate that IPD-1151T inhibits IgE production in vivo and results in attenuating effect on bronchoconstriction.
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Affiliation(s)
- K Asano
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
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89
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Ito J, Asano K, Tryka E, Kanai K, Yamamoto S, Hisamitsu T, Suzaki H. Suppressive effects of co-stimulatory molecule expressions on mouse splenocytes by anti-allergic agents in vitro. Mediators Inflamm 2000; 9:69-75. [PMID: 10958379 PMCID: PMC1781751 DOI: 10.1080/096293500411523] [Citation(s) in RCA: 8] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The influence of anti-allergic drugs, epinastine hydrochloride (EP) and disodium cromoglycate (DSCG), on the co-stimulatory molecule expression was examined using in vitro cell culture technique. Spleen cells obtained from BALB/c mice 10 days after immunization with haemocyanin absorbed to aluminium hydroxide were cultured in the presence of 100.0 microg/ml haemocyanin and various concentrations of the agents. Low concentrations (<1.5 x 10(-4)M) of EP and DSCG did not influence spleen cell blastic activity induced by antigenic stimulation, whereas these agents caused significant inhibition of spleen cell activation when 2 x 10(-4) M of the agents were added to cell cultures. EP and DSCG also did not affect blastic activity of sensitized splenic T cells by anti-CD3 monoclonal antibody stimulation even when these cells were cultured in the presence of 2 x 10(-4) M of the agents. We next examined the influence of EP and DSCG on the expression of co-stimulatory molecules on spleen cells in response to antigenic stimulation. Sensitized spleen cells were cultured in the presence of 2 x 10(-4)M of the agents and the expression of molecules were examined by flow cytometer 24h later. EP and DSCG suppressed the expression of costimulatory molecules, CD40 and CD80, but not CD86, on splenic B cells which were enhanced by antigenic stimulation in vitro.
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Affiliation(s)
- J Ito
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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90
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Shimane T, Asano K, Mizutani T, Hisamitsu T, Suzaki H. [Inhibitory action of roxithromycin on mast cell activation]. Jpn J Antibiot 2000; 53 Suppl A:70-4. [PMID: 10756456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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91
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Asano K, Sugimoto K, Watanabe T, Hisano M, Hisamitsu T. Suppressive effects of the Chinese herbal remedy Tripterygium wilfordii Hook f on eosinophilia and IgE hyperproduction in mice. Allergol Int 2000. [DOI: 10.1046/j.1440-1592.2000.00156.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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92
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Tryka E, Asano K, Ito J, Hisamitsu T, Suzaki H. Suppressive effects of azelastine hydrochloride on CD40 expression in mice. In Vivo 1999; 13:479-81. [PMID: 10757040] [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: 02/16/2023]
Abstract
The present study was designed to examine the influence of an anti-allergic agent, azelastine hydrochloride (AZ) on a co-stimulatory molecule, CD40 expression in actively sensitized mice. BALB/c mice were sensitized by intraperitoneal injection of two doses of dinitrophenylated-ovalbumin and Al(OH)3 at one-week intervals. The mice were treated orally with 0.1 mg/kg of AZ once a day for 14 days starting the same day of booster sensitization. AZ treatment of mice caused the significant suppression of total serum IgE concentration on Day 21 after the first sensitization. However, AZ treatment scarcely affected IL-4 concentration in aqueous spleen extracts. Flowcytometric analysis revealed the suppressive effects of AZ on CD40 expression on sensitized-spleen cells. These data may suggest that AZ suppresses the production of IgE through the inhibition of CD40 expression.
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Affiliation(s)
- E Tryka
- Department of Otorhinolaryngology, School of Medicine, Showa University, Tokyo, Japan
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93
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Tryka E, Asano K, Ito J, Hisamitsu T, Suzaki H. Influence of anti-allergic agents on in vivo expression of co-stimulatory molecules in normal mice. In Vivo 1999; 13:415-20. [PMID: 10654195] [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: 02/15/2023]
Abstract
The co-stimulatory signal provided by the interaction between CD28 and its ligands, CD80 and CD86, is critical for T cell activation. Engagement of CD40 and CD40L is also essential for IgE synthesis and secretion. In the present study, we examined the influence of anti-allergic drugs on co-stimulatory molecule (CD40, CD80 and CD86) expression in normal mouse splenocytes by flow cytometry. Treatment of BALB/c mice with azelastine (AZ) at a dose of 50.0 micrograms/kg/day, which is the most effective therapeutic dose, for two weeks scarcely affected the expression of co-stimulatory molecules CD40, CD80 and CD86 on splenocytes, whereas a three-week treatment strongly suppressed the expression of these molecules. We also examined the influence of terfenadine (TR) on co-stimulatory molecule expression. The expression of molecules on splenocytes was inhibited when donor mice were treated orally with 2.0 mg/kg/day of TR for three weeks. However, it was not inhibited during a two-week period treatment. These results suggest that the attenuating effects of anti-allergic agents on the diseases may be explained, in part, by their inhibitory action of co-stimulatory molecule expression.
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Affiliation(s)
- E Tryka
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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94
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Fang JQ, Aoki E, Yu Y, Sohma T, Kasahara T, Hisamitsu T. Inhibitory effect of electroacupuncture on murine collagen arthritis and its possible mechanisms. In Vivo 1999; 13:311-8. [PMID: 10586371] [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: 02/14/2023]
Abstract
The influence of electroacupuncture (EA), a traditional Chinese medical treatment, on type II collagen-induced arthritis (CIA) was examined in DBA/IJ mice in vivo. Mice were immunized intradermally twice at a 3-week interval with bovine type II collagen (C II). EA stimulation, begun on day 21 simultaneously with the second immunization, was applied at the acupoint equivalent to GV4 three times a week for 3 weeks. The results showed that EA delayed the onset, attenuated the severity of arthritis, and reduced the anti-collagen antibody level. Furthermore, we investigated the impact of EA on the productions of endogenous interleukin-1 beta (IL-1 beta) and prostaglandin E2 (PGE2), and the levels of IL-1 beta mRNA in splenocytes and synovial tissues from C II immunized mice on day 45 and cyclooxygenase-2 (COX-2) mRNA in lipopolysaccharide (LPS)-stimulated macrophages of normal mice by using reverse transcriptase-polymerase chain reaction (RT-PCR). EA stimulation significantly inhibited the concentrations of splenic endogenous IL-1 beta and serum PGE2. The expression of IL-1 beta mRNA in spleen cells was obviously down-regulated and that in synovial tissues was modestly affected by EA. COX-2 mRNA was highly expressed in cultured peritoneal macrophages when stimulated with LPS. Previous treatment with EA also reduced LPS-stimulated induction of COX-2 mRNA. These data suggest that EA has an inhibitory effect on murine CIA, and the partial mechanism of its therapeutic result may be attributed to inhibiting the productions of IL-1 beta and PGE2 by suppressing the IL-beta and COX-2 gene activations.
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MESH Headings
- Animals
- Arthritis, Experimental/blood
- Arthritis, Experimental/diagnosis
- Arthritis, Experimental/immunology
- Arthritis, Experimental/prevention & control
- Arthritis, Experimental/therapy
- Cells, Cultured
- Collagen/immunology
- Cyclooxygenase 2
- Dinoprostone/blood
- Disease Models, Animal
- Electroacupuncture
- Interleukin-1/biosynthesis
- Interleukin-1/genetics
- Isoenzymes/genetics
- Isoenzymes/metabolism
- Lipopolysaccharides/pharmacology
- Macrophage Activation/drug effects
- Macrophage Activation/immunology
- Macrophages, Peritoneal/drug effects
- Macrophages, Peritoneal/enzymology
- Male
- Mice
- Mice, Inbred DBA
- Prostaglandin-Endoperoxide Synthases/genetics
- Prostaglandin-Endoperoxide Synthases/metabolism
- RNA, Messenger/biosynthesis
- Severity of Illness Index
- Spleen/metabolism
- Synovial Membrane/metabolism
- Time Factors
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Affiliation(s)
- J Q Fang
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan
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95
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Okada M, Guo SY, Sunagawa M, Hisamitsu T. [Denervation of the cervical sympathetic nerve inhibited the splenic natural killer cell activity by modulation of the splenic sympathetic nerve activities in rats]. Masui 1999; 48:787-90. [PMID: 10434523] [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] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
It is known that the splenic natural killer cell (NK) activity 4 weeks after unilateral resection of the cervical sympathetic nerve (csn) is significantly lower than that after sham operation in rats. To investigate the role of the splenic sympathetic nerve, the splenic NK activity after csn was compared in the control animals (n = 9) and the splenic sympathetic nerve denervated animals (n = 8). The splenic NK activity in control group was reduced significantly after csn, whereas that in splenic nerve denervated group did not reveal significant change after csn. The results suggest that the reduction of the splenic NK activity after csn is induced through the modulation of the splenic sympathetic nerve activities.
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Affiliation(s)
- M Okada
- Department of Physiology, School of Medicine, Showa University, Tokyo
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96
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Asano K, Satoh K, Hosaka M, Arakawa H, Inagaki M, Hisamitsu T, Maeda M, Kochi M, Sakagami H. Production of hydrogen peroxide in cancerous tissue by intravenous administration of sodium 5,6-benzylidene-L-ascorbate. Anticancer Res 1999; 19:229-36. [PMID: 10226547] [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: 02/12/2023]
Abstract
We investigated whether the antitumor action of sodium 5,6-benzylidene-L-ascorbate (SBA) is mediated via oxidation-involved mechanism, in three different systems: 3'-methyl-4-dimethylaminoazobenzene (DAB)-induced rat hepatocellular carcinoma (in vivo), its homogenate (semi in vivo), and cultured cells (in vitro). Oral intake of DAB irreversibly produced hepatocellular carcinoma in rats, with a maximum incidence of carcinogenesis after 4 months. Intravenous administration of SBA induced vacuolar, eosinophilic degeneration and nuclear debris, producing greater amounts of ESR signal of ascorbate radical and hydrogen peroxide (H2O2)-derived chemiluminescence (CL) (H2O2-CL) in the cancerous tissue than in the normal tissue. When SBA was directly added to the homogenates, higher amounts of ascorbate radical and H2O2-CL were generated in cancerous tissues. When SBA was added to the RPMI1640 medium supplemented with 10% fetal bovine serum, methionine was oxidized to methionine sulfoxide and H2O2 was produced in amounts that sufficiently induce apoptotic cell death in human promyelocytic leukemic HL-60 cells. Cytotoxic activity of SBA was significantly reduced by catalase. These data suggest that antitumor activity of SBA in vivo might at least in part be due to H2O2, produced from SBA.
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Affiliation(s)
- K Asano
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan
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97
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Suzaki H, Asano K, Ohki S, Kanai K, Mizutani T, Hisamitsu T. Suppressive activity of a macrolide antibiotic, roxithromycin, on pro-inflammatory cytokine production in vitro and in vivo. Mediators Inflamm 1999; 8:199-204. [PMID: 10704073 PMCID: PMC1781807 DOI: 10.1080/09629359990351] [Citation(s) in RCA: 50] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
This study was designed to examine the influence of a macrolide antibiotic, roxithromycin (RXM), on the production of pro-inflammatory cytokines, interleukin (IL)-1beta and tumor necrosis factor (TNF)-alpha. In the first experiments, we examined the effect of RXM on in vitro cytokine production from lipopolysaccharide (LPS)-stimulated human peripheral blood monocytes. The monocytes were cultured in the presence of various doses of the agent. After 24 h, the culture supernatants were obtained and assayed for IL-1beta and TNF-alpha contents by enzyme-linked immunosorbent assay. RXM suppressed the in vitro production of IL-1beta and TNF-alpha in response to LPS stimulation. This was dose dependent and first noted at a concentration of as little as 0.05 microg/ml, which is much lower than therapeutic blood levels. In the second part of the experiments, we examined the influence of RXM on the appearance of IL-1beta and TNF-alpha in mouse lung extract induced by LPS inhalation. RXM was administered orally into BALB/c mice at a single dose of 2.5 mg/kg once a day for 5-12 weeks. These mice were then instilled with LPS into the trachea and examined for the presence of cytokines in aqueous lung extracts. Pretreatment of mice with RXM for 5 weeks did not influence of the appearance of both IL-1beta and TNF-alpha in aqueous lung extracts. However, pretreatment for more than 7 weeks dramatically suppressed the cytokine appearance in the extracts.
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Affiliation(s)
- H Suzaki
- Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
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98
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Asano K, Matsuishi J, Yu Y, Nemoto K, Nakazawa M, Kasahara T, Hisamitsu T. Suppressive activity of the chloroform extract of Tripterygium wilfordii Hook f on effector T cell activation during Hymenolepis nana infection in mice. Am J Chin Med 1998; 26:181-9. [PMID: 9799970 DOI: 10.1142/s0192415x98000233] [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: 11/18/2022]
Abstract
The chloroform extract of Tripterygium wilfordii Hook f (TWH extract) administered into mice daily at doses of 80.0 to 200.0 micrograms/kg (but not 40.0 micrograms/kg) caused suppression of protective immunity to Hymenolepis nana when the extract was injected subcutaneously during the induction phase of protective immunity. Daily administration of 200.0 micrograms/kg TWH extract, during the course of larval development from challenge, also suppressed protective immunity. Inhibition of protective immunity was only observed in mice that received TWH extract for 6 days at a daily dose of 200.0 micrograms/kg and were challenged 24 h after the final injection. TWH extract did not inhibit formation of effector cells that mediate delayed type hypersensitivity (DTH) to H. nana egg antigen when the extract was administered subcutaneously at a dose of 200.0 micrograms/kg/day for 5 days before cell preparation. However, TWH extract did inhibit DTH effector cell activation when cells prepared from infected, PBS-injected mice were transferred into 200.0 micrograms/kg TWH extract-treated recipient mice. These results strongly indicate that TWH extract cannot inhibit the generation of effector cells but will suppress their function in vivo.
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Affiliation(s)
- K Asano
- Department of Medical Biology, Showa University, Tokyo, Japan
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99
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Yu Y, Kasahara T, Sato T, Asano K, Yu G, Fang J, Guo S, Sahara M, Hisamitsu T. Role of endogenous interferon-gamma on the enhancement of splenic NK cell activity by electroacupuncture stimulation in mice. J Neuroimmunol 1998; 90:176-86. [PMID: 9817445 DOI: 10.1016/s0165-5728(98)00143-x] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.3] [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: 10/18/2022]
Abstract
Successive electro-acupuncture (EA) stimulation applied to bilateral anterior tibial muscles, where Zusanli (ST36) acupoints are located, once a day (30 min) for 3 successive days significantly enhanced splenic natural killer (NK) cell activity in BALB/c mice. The percentage of splenic NK cells, as measured by flow cytometry, was not affected in these mice. Interferon (IFN)-gamma level in splenic aqueous extract, prepared from the ST36 acupoint-stimulated mice, was significantly higher than that of the controls. In vivo treatment with neutralizing monoclonal antibody against mouse IFN-gamma completely abrogated the increase in splenic NK cell activity induced by ST36 acupoint stimulation. The same stimulation also significantly increased the concentration of splenic beta-endorphin, which coincided with the significant increase in splenic IFN-gamma production. Pre-administration of 10 mg/kg naloxone before initiation of EA stimulation every day reduced the enhancements of NK cell activity and IFN-gamma level. These observations strongly suggest that endogenous IFN-gamma mediates the up-regulation of NK cell activity by EA stimulation at the ST36 acupoints. Furthermore, endogenous beta-endorphin secreted by EA stimulation also plays an important role in the up-regulation of NK cell function, which may be realized through regulating IFN-gamma production.
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Affiliation(s)
- Y Yu
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan
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100
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Fang JQ, Guo SY, Asano K, Yu Y, Kasahara T, Hisamitsu T. Antipyretic action of peripheral stimulation with electroacupuncture in rats. In Vivo 1998; 12:503-10. [PMID: 9827358] [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: 02/09/2023]
Abstract
The present study was designed to investigate the antipyretic action of peripheral stimulation with electroacupuncture (EA) in SD rats. EA stimulation was applied for 30 min to the peripheral muscle where the equivalent Quchi (LI11) acupoint is located. We first examined the effects of EA stimulation on fever induced by either lipopolysaccharide (LPS), interleukin-1 beta (IL-1 beta) or prostaglandin E2 (PGE2). Intraperitoneal injection of LPS at a dose of 100 micrograms/kg caused a high rectal temperature, which was suppressed by EA stimulation. EA stimulation also inhibited the development of fever induced by IL-1 beta injection either intravenously or into the preoptic area (POA). The rats that received administration of PGE2 into POA developed rapid and high fevers, which were attenuated by EA stimulation. In the second part of the experiment, we investigated the levels of cytokines and PGE2 during the development of fever. The concentrations of IL-6 and PGE2 but not IL-1 beta, in brain and serum were increased by intraperitoneal injection of 100 micrograms/kg LPS. EA stimulation reduced PGE2 levels in both brain and serum in LPS-injected rats, but failed to change the levels of IL-6. Intravenous injection of IL-1 beta produced high brain and serum PGE2 levels, which were also significantly suppressed by EA stimulation. The results suggest that EA stimulation possesses an antipyretic effect through the inhibition of the action of PGE2 in rats.
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Affiliation(s)
- J Q Fang
- Department of Physiology, School of Medicine, Showa University, Tokyo, Japan
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