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熊本大学学術リポジトリ Kumamoto University Repositor Title 炎症性腸疾患に対する HSF1 及び HSP70 の保護的役割 Author(s) 田中, 健一郎 Citation Issue date Type URL Thesis or Di

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(1)熊本大学学術リポジトリ Kumamoto University Repository System Title. 炎症性腸疾患に対する HSF1、及び HSP70 の保護的役割. Author(s). 田中, 健一郎. Citation Issue date. 2008-03-25. Type. Thesis or Dissertation. URL. http://hdl.handle.net/2298/9448. Right.

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(4) GENETIC EVIDENCE FOR A PROTECTIVE ROLE FOR HEAT SHOCK FACTOR 1 AND HEAT SHOCK PROTEIN 70 AGAINST COLITIS. Ken-Ichiro Tanaka. Summary  Inflammatory bowel disease (IBD) involves infiltration of leukocytes into intestinal tissue, resulting in intestinal damage induced by reactive oxygen species (ROS). Pro-inflammatory cytokines and cell adhesion molecules (CAMs) play important roles in this infiltration of leukocytes. The roles of heat shock factor 1 (HSF1) and heat shock proteins (HSPs) in development of IBD are unclear.. In this study, we have. examined the roles of HSF1 and HSPs in an animal model of IBD, dextran sulfate sodium (DSS)-induced colitis. The colitis worsened or was ameliorated in HSF1-null mice or in transgenic mice expressing HSP70 (or HSF1), respectively. Administration of DSS up-regulated the expression of HSP70 in colonic tissues in an HSF1-dependent manner. Expression of pro-inflammatory cytokines and CAMs and the level of cell death observed in colonic tissues were increased or decreased, relative to the wild-type controls, in DSS-treated HSF1-null mice or transgenic mice expressing HSP70, respectively. Relative to macrophages from control wild-type mice, macrophages prepared from HSF1-null mice or transgenic mice expressing HSP70 displayed enhanced or reduced activity, respectively, for the generation of pro-inflammatory cytokines in response to lipopolysaccharide stimulation.. Suppression of HSF1 or. HSP70 expression in vitro stimulated lipopolysaccharide-induced up-regulation of CAMs or ROS-induced cell death, respectively.. This study provides the first genetic. evidence that HSF1 and HSP70 play a role in protecting against DSS-induced colitis. Furthermore, this protective role seems to involve various mechanisms, such as suppression of expression of pro-inflammatory cytokines and CAMs, and ROS-induced cell death.. 2.

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(64)   Fig.1. Development of DSS-induced colitis in HSF1-null mice and wild-type mice. HSF1-null mice (-/-) and wild-type mice (ICR) (+/+) were treated with or without 3% DSS for 7 days. Body weight (A) and DAI (B) were measured daily. After 7 days, length of colon (C), colonic MPO activity (D) and colonic TBARS (E) were determined as described in the materials and methods. After 7 days, sections of colonic tissues were prepared and subjected to histological examination (H&E staining) and the damage score and extent of lesion for 8 independent sections were determined (G, H). One of the sections is shown (F). Values are mean ± S.E.M. (n=3-10). **P<0.01; *P<0.05. n.s. not significant.. 18.

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(68)  Fig.2. Expression of HSPs in colonic tissues of HSF1-null and wild-type mice. HSF1-null mice (-/-) and wild-type mice (ICR) (+/+) were treated with or without 3% DSS for 7 days (A, B). Colonic tissues were removed and total RNA was extracted. Samples were subjected to real-time RT-PCR, using a specific primer set for each gene. Values were normalized to the GAPDH gene, expressed relative to the control sample (i.e. wild-type mice without DSS-treatment), and given as the mean ± S.E.M. (n=3-6). **P<0.01. n.s. not significant (A). Sections of colonic tissues were prepared and subjected to immunohistochemical analysis with an antibody against HSP70 (B).. 20.

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(73)  Fig.3. Development of DSS-induced colitis in transgenic mice expressing HSF1 and wild-type mice. Development of DSS-induced colitis was induced and monitored in transgenic mice expressing HSF1 (HSF1 Tg) and wild-type mice (C57/BL6) (WT), as described in the legend of Fig.1. Values are expressed as mean ± S.E.M. (n=3-5). ***P<0.001; *P<0.05. n.s. not significant (A-E). Expression of HSP70 in colonic tissues was monitored by immunohistochemical analysis as described in the legend of Fig. 2 (F).. . 23.

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(77)  Fig.4. Development of DSS-induced colitis in transgenic mice expressing HSP70 and wild-type mice. DSS-induced colitis was induced and monitored in transgenic mice expressing HSP70 (HSP70 Tg) and wild-type mice (C57/BL6) (WT), as described in the legend of Fig.1. Values are mean ± S.E.M. (n=3-10). ***P<0.001, **P<0.01; *P<0.05. n.s. not significant (A-E). Expression of HSP70 in colonic tissues was monitored by immunohistochemical analysis as described in the legend of Fig. 2 (F).. 26.

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(95)  Fig.5. mRNA expression of various genes in colonic tissues. HSF1-null mice (-/-) and wild-type mice (ICR) (+/+) (A) or transgenic mice expressing HSP70 (HSP70 Tg) and wild-type mice (C57/BL6) (WT) (B) were treated with or without 3% DSS for 7 days. Relative mRNA expression of each gene in colonic tissues was monitored and expressed as described in the legend of Fig.2. Values are mean ± S.E.M. (n=3-6). **P<0.01; *P<0.05. n.s. not significant.. 32.

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(98)  Fig.6. LPS-stimulated production of pro-inflammatory cytokines in peritoneal macrophages. Peritoneal macrophages were prepared from HSF1-null mice (-/-) and wild-type mice (ICR) (+/+) (A) or transgenic mice expressing HSP70 (HSP70 Tg) and wild-type mice (C57/BL6) (WT) (B) and incubated with the indicated concentrations of LPS for 24 h. The amount of each cytokine in the medium was determined by ELISA. Values are mean ± S.E.M. (n=3-4). ***P<0.001; **P<0.01; *P<0.05.. 34.

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(144)  Fig.8. Levels of cell death in colonic mucosa after DSS administration. HSF1-null mice (-/-) and their respective wild-type mice (ICR) (+/+) (A) or transgenic mice expressing HSP70 (HSP70 Tg) and their respective wild-type mice (C57/BL6) (WT) (B) were administered with 3% DSS for 7 days. Sections of colonic tissues were prepared and subjected to TUNEL assay and DAPI staining. The right panel in each column is a 2-times magnified image of the boxed area defined in the left panel.. 43.

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(154)   Fig.9. Effect of siRNA for HSF1 and HSP70 on menadione-induced cell death. HCT-15 cells were transfected with 1.2 μg of siRNA for HSF1 (siHSF1) (A, B), siRNA for HSP70 (siHSP70) (C, D), or non-silencing (ns) siRNA (A-D). After 24 h, cells were incubated with the indicated concentrations of menadione for 1 h. Relative expression of each gene was monitored as described in the legend of Fig.2. Values were normalized to the actin gene, expressed relative to the control sample, and are given as the mean ± S.E.M. (n=3) (A, C). Cell viability was determined using the MTT method (B, D). Values shown are mean ± S.E.M. (n=3). ***P<0.001; **P<0.01; *P<0.05. n.s. not significant.. 46.

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