No abstract available.
Animals ; Mice*

No abstract available.
Animals ; Mice*

Dendritic cell (DC)s are protessional antigen presenting cells and they have been used for antitumor immunotherapy or cell vaccines. However therapy using DC is restricted because the number of DC available from tissue is very low. Flt3 ligand (FL) has been known as a hematopoietic growth factor that increases proliferation of hematopoietic stem cells and progenitor cells, and recently it showed inducibility of dendritic cell (DC)s and signiticant antitumor effects in vivo. Thus FL will be frequently used for DC induction and antitumor immunotherapy in future. Here we constructed FL plasmid and studied its in vivo effect. FL plasmids were made by cloning of partial FL cDNA into pcDNA3 plasmid, and gene expression and protein producibility of FL plasmid were confirmed in Renca cells transfected with FL plasmid. Mice were injected with FL plasmid (100ug/mouse) three times and 20 days later mouse spleens were harvested for staining and RT-PCR. There were lots of blastogenic cells in the spleen of mice treated with FL plasmid. FL plasmid also induced DEC205, IL-12 and GM-CSF gene expression in mouse splenocyte. All these data suggest FL plasmid may be used for induction of DC and antitumor therapy as DNA adjuvant.
Mice ; Animals

Regarding numerical changes of leukocytes involved in immune defects following thermal injury, a lot of controversial results have been reported. In this study, the changes of leukocyte number and distribution were examined and compared in spleen and lymph nodes of thermally injured mice. Mice (Balb/c) were anesthetized by intraqeritoneal injection of 2,2,2-tribromoethanol and thermally injured by immersion of hair-removed dorsal skin (15% total body surface) in a boiling water bath (96`C) for 7 seconds. Both of lymph node cell (LNC) and spleen cell (SPC) numbers decreased significantly at day 2 of injury and thereafter rebounded, but in a distinct pattern; 1) LNC numer returned to over normal level at day 6 and normalized again, whereas SPC number increased gradually over normal level and sustained until day 24 of injury. 2) Such increase of LNC and SPC number coincided with higher proportion of PMN and relative decline of lymphacytes, particularly CD3 T cells rather than slg' B cells, but such alteration was more significant in spleen. The changes of peripheral blood leukocyte (PBL) number was comparable to those of SPC. These data suggest that the cause of immune modulation in thermally injured mice acts systemically. In addition, it is noteworthy that reduction of lymphocyte and CD3 T cell proportions was due to relative increase of PMN number, not the decrease of absolute number of lymphocytes. Spontaneous recovery of injured mice in this study also implicates that increase of PMN number may be responsible for recovery from injury without infection. Finally, the CD4'/CD8' ratio of injured mice was lower only at day 2 ot injury, but not significantly, than that of control group. It is likely that contribution of Th/Ts ratio to immune defect after thermal injury should be determined together with other factors, such as injured body surface % and severity of injury.
Mice ; Animals

We have used BALB/c mice as an animal model for the study of anaphylactic hypersensitivity to the house dust mite. For the sensitization, BALB/c mice were injected with a single dose of extracts of Oermatophagoides farinae (D. pa) or Dermatophagoides pteronyssinus (D. pt) mixed with adjuvants (aluminum hydroxide and Bordetella pertussis) intraperitonealy. On days of 15, 30, and 60 after the sensitization, the mice received a challenge dose of the same allergen intravenously to induce anaphylactic shock. The hypersensitivity reactions were scored by anaphylactic shock. And various immunological parameters, including cytokines and immunoglobulin isotypes, were studied in relation with the shock. A high level of anaphylactic shock was produced in the mice by both of the allergens, D, fa and D, pt, at 15 and 30 days after sensitization. In vitro Ag specific proliferative reponses of spleen cells from D. pt treated mice (D. pt mice) was six times higher than those from O. fa treated mice (O. fa mice). Regardless the differences in antigens, the production of IFN-r by spleen cells from D. pt mice or O. fa mice was equally high at 15 days after sensitization. However, the ability to produce IFN-r by the spleen cells from D, pt mice was three times higher compared to that from D. fa mice. The production of IL-4 by the spleen cells was enhanced slightly but not significant in both groups. In studies of the allergen-specific immunoglobulin isotypes in the sera of the mice, the level of IgE in both groups was enhanced slightly but not significant. In contrast, the level of IgG subtypes were increased in both groups. When the levels of IgG were compared by subtypes, the level of IgG1 increased significantly on day 15 when the anaphylactic shock score was maximized in both groups. Increase in IgG2a level at the day was not significant, instead, asignificant increase in IgG2 levels was observed on day 60 after sensitization when the anaphylaxis was almost discontinued. Although a higher level of IgG3 was examined on day 15 and 30 in D. pt mice and on day 60 in D, fa mice, anaphylaxis was not appeared to be associated with the levels of IgG3 in this study. The IgG1, rather than IgE, was assumed to the major factor involved in the anaphylactic response observed in this experiment. In conclusion, BALB/c mice would be an animal model for the study of anaphylactic hypersensitivity to D. fa or D, pt., which might be an essential tool for the future development of immuno-therapeutic agents.
Mice ; Animals

BACKGROUND: Hypertrophy of podocytes is observed in type 2 diabetic patients. Cellular hypertrophy requires combined effects of various mitogen- induced entry into the cell cycle and subsequent cell cycle arrest at the G1/S interphase. This cell cycle arrest is mediated by various cyclin-dependent kinase inhibitors (CKIs). We investigated the effect of angiotensin II receptor blocker (ARB) treatment on podocyte hypertrophy and CKIs expression in cultured podocytes stimulated by long-term high glucose. METHODS: Immortalized mouse podocytes were cultured in media containing 5.6 mM normal glucose (NG), 30 mM high glucose (HG), or NG+angiotensin II (AII, 10(-7)M) for 7 days with or without ARB (L-158,809, 10(-6)M). Cellular hypertrophy was assessed by measurement of cellular protein/cell counts, and CKIs mRNA and protein expression were assessed by reverse-transcription polymerase chain reaction (RT-PCR) and Western blot, respectively. RESULTS: Cellular hypertrophy was induced in podocytes exposed to HG or AII compared to NG cells and this HG-induced cellular hypertrophy was inhibited with ARB treatment by 70% (p<0.05). In addition, there were 1.5-fold and 2.0 fold increases in p27Kip1 mRNA and protein expression, respectively, in HG-stimulated podocytes compared to NG- treated cells (p<0.05). p27Kip1 mRNA and protein expression were also increased in cultured podocytes stimulated by AII by 156% and 199%, respectively (p<0.05). ARB treatment ameliorated HG-induced increase in p27Kip1 mRNA by 75% and protein expression by 70% (p<0.05). In contrast, there were no significant changes in p21Cip1 and p57Kip2 protein expression in cultured podocytes exposed to HG or AII. CONCLUSION: High glucose induced significant cellular hypertrophy and increased p27Kip1 mRNA and protein expression in cultured mouse podocytes, and these changes were effectively inhibited by ARB treatment.
Mice ; Animals

BACKGROUND: Hypertrophy of podocytes is observed in type 2 diabetic patients. Cellular hypertrophy requires combined effects of various mitogen- induced entry into the cell cycle and subsequent cell cycle arrest at the G1/S interphase. This cell cycle arrest is mediated by various cyclin-dependent kinase inhibitors (CKIs). We investigated the effect of angiotensin II receptor blocker (ARB) treatment on podocyte hypertrophy and CKIs expression in cultured podocytes stimulated by long-term high glucose. METHODS: Immortalized mouse podocytes were cultured in media containing 5.6 mM normal glucose (NG), 30 mM high glucose (HG), or NG+angiotensin II (AII, 10(-7)M) for 7 days with or without ARB (L-158,809, 10(-6)M). Cellular hypertrophy was assessed by measurement of cellular protein/cell counts, and CKIs mRNA and protein expression were assessed by reverse-transcription polymerase chain reaction (RT-PCR) and Western blot, respectively. RESULTS: Cellular hypertrophy was induced in podocytes exposed to HG or AII compared to NG cells and this HG-induced cellular hypertrophy was inhibited with ARB treatment by 70% (p<0.05). In addition, there were 1.5-fold and 2.0 fold increases in p27Kip1 mRNA and protein expression, respectively, in HG-stimulated podocytes compared to NG- treated cells (p<0.05). p27Kip1 mRNA and protein expression were also increased in cultured podocytes stimulated by AII by 156% and 199%, respectively (p<0.05). ARB treatment ameliorated HG-induced increase in p27Kip1 mRNA by 75% and protein expression by 70% (p<0.05). In contrast, there were no significant changes in p21Cip1 and p57Kip2 protein expression in cultured podocytes exposed to HG or AII. CONCLUSION: High glucose induced significant cellular hypertrophy and increased p27Kip1 mRNA and protein expression in cultured mouse podocytes, and these changes were effectively inhibited by ARB treatment.
Mice ; Animals

Bone resorption involves sequential stages of osteoclast precursor migration and differen-tiation of osteoclast precursors into multinucleated osteoclasts. Stromal cell derived factor (SDF)-1 is a chemotactic factor for osteoclast precursor migration. Matrix metalloproteinase (MMP)-9 is involved in migration of osteoclast precursors and activation of interleukin(IL)-1beta. Alveolar bone destruction is a characteristic feature of periodontal disease. Treponema lecithinolyticum is a oral spirochete isolated from the periodontal lesions. The effect of lipopolysaccharide(LPS) from T. lecithinolyticum on expression of SDF-1 and MMP-9 was examined in cocultures of bone marrow cells and osteblasts derived from mouse calvariae. T. lecithinolyticum LPS increased expression of MMP-9 in the coculture. Polymyxin B, an inhibitor of LPS, abolished the increase of MMP-9 mRNA expression by LPS. LPS did not increase the expression of SDF-1, IL-1beta and tumor necrosis factor(TNF)-alpha mRNA in cocultures. Prostaglandin E2(PGE2) up-regulated the expression of MMP-9 and NS398, an inhibitor of PGE2 synthesis, down-regulated the induction of MMP-9 expression by T. lecithinolyticm LPS. These results suggest that T. lecithinolytium LPS increases MMP-9 expression in bone cells via PGE2 and that the induction of MMP-9 expression by T. lecithinolyticum LPS is involved in alveolar bone destruction of periodontitis patients by the increase of osteoclast precursor migration and the activation of bone resorption-inducing cytokine.
Mice ; Animals

Bone resorption involves sequential stages of osteoclast precursor migration and differen-tiation of osteoclast precursors into multinucleated osteoclasts. Stromal cell derived factor (SDF)-1 is a chemotactic factor for osteoclast precursor migration. Matrix metalloproteinase (MMP)-9 is involved in migration of osteoclast precursors and activation of interleukin(IL)-1beta. Alveolar bone destruction is a characteristic feature of periodontal disease. Treponema lecithinolyticum is a oral spirochete isolated from the periodontal lesions. The effect of lipopolysaccharide(LPS) from T. lecithinolyticum on expression of SDF-1 and MMP-9 was examined in cocultures of bone marrow cells and osteblasts derived from mouse calvariae. T. lecithinolyticum LPS increased expression of MMP-9 in the coculture. Polymyxin B, an inhibitor of LPS, abolished the increase of MMP-9 mRNA expression by LPS. LPS did not increase the expression of SDF-1, IL-1beta and tumor necrosis factor(TNF)-alpha mRNA in cocultures. Prostaglandin E2(PGE2) up-regulated the expression of MMP-9 and NS398, an inhibitor of PGE2 synthesis, down-regulated the induction of MMP-9 expression by T. lecithinolyticm LPS. These results suggest that T. lecithinolytium LPS increases MMP-9 expression in bone cells via PGE2 and that the induction of MMP-9 expression by T. lecithinolyticum LPS is involved in alveolar bone destruction of periodontitis patients by the increase of osteoclast precursor migration and the activation of bone resorption-inducing cytokine.
Mice ; Animals

PURPOSE: Oral mucositis induced by radiotherapy to the head and neck area, is a common acute complication and is considered as the most severe symptom for cancer patients in the early stages of treatment. This study was proposed to establish the oral mucositis mouse model induced by a single dose of radiation for the facility of testing therapeutic candidates which can be used for the oral mucositis treatments. MATERIALS AND METHODS: Fifty-five BALB/c mice were divided into four groups: control, 16 Gy, 18 Gy, and 20 Gy. Oral mucositis was induced by a single dose of radiation to the head and neck using 6 MV x-Ray from linear accelerator. After irradiation, body weight and physical abnormalities were checked daily. Tongue tissues from all groups were taken on days 1, 2, 3, 5, 7, 9, and 14, respectively and H&E staining was conducted to examine morphological changes. RESULTS: Body weight dramatically decreased after day 5 in all irradiated mice. In the 16 Gy treatment group, body weight was recovered on day 14. The histology data showed that the thickness of the epithelial cell layer was decreased by the accumulated time after radiation treatment, up to day 9. Severe ulceration was revealed on day 9. CONCLUSION: A single dose of 16 Gy is sufficient dose to induce oral mucositis in Balb/C mice. Significant changes were observed in the Balb/C mice on days 7 and 9 after radiation. It is suggested that this mouse model might be a useful standard tool for studying oral mucositis induced by radiation.
Mice ; Animals