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排序方式: 共有359条查询结果,搜索用时 28 毫秒
81.
Identification of ligands binding specifically to inflammatory intestinal mucosa using phage display 总被引:1,自引:0,他引:1
Takagi T Arisawa T Yamamoto K Hirata I Nakano H Sawada M 《Clinical and experimental pharmacology & physiology》2007,34(4):286-289
1. Even though current treatments for inflammatory bowel disease are effective, adverse reactions remain a problem. With the intention of developing a new drug delivery system, we attempted to identify molecules that are selectively adsorbed to inflamed bowel. 2. The PhD-C7C phage display peptide library was used for biopanning against mouse isolated bowel, either untreated (control) or with inflammation caused by ischaemia-reperfusion injury. One hundred clones were selected from among those obtained by two biopanning procedures and the amino acid sequences of these clones were identified by determination of the base sequences. 3. Then, 20 clones were selected by an alignment process, after which the three clones with the highest affinity for inflammatory bowel were identified. One of these three clones had significantly higher affinity for inflammatory bowel than for normal bowel. 4. In conclusion, biopanning against isolated bowel samples identified an amino acid sequence (SQSHPRH) with a specific high affinity for inflammatory bowel. 相似文献
82.
Mitsuyama K Suzuki A Tomiyasu N Tsuruta O Kitazaki S Takeda T Satoh Y Bennett BL Toyonaga A Sata M 《International journal of molecular medicine》2006,17(3):449-455
Since Jun-N-terminal kinase participates in intracellular signaling cascades resulting in inflammatory responses, inhibiting this pathway may represent a new treatment for inflammatory bowel disease including ulcerative colitis and Crohn's disease. However, the functional significance of the activation of this kinase in inflammatory bowel disease remains unclear. We investigated whether Jun-N-terminal kinase activation is increased in inflammatory bowel disease and analyzed the effects of SP600125, which decreases inflammatory cytokine synthesis by inhibiting the phosphorylation of this kinase. Phosphorylation of the kinase was examined in affected human colon using an enzyme-linked immunosorbent assay and immunohistochemistry. The effect of SP600125 on cytokine production was examined in cultures of patients' leukocytes and colonic tissue. Finally, rats received injection of SP600125 (30 mg/kg, s.c.) or vehicle twice daily 2 h before the induction of colitis with dextran sulfate sodium. SP600125 effects were determined observationally and histologically. Colonic tissue contained increased phosphorylated kinase in patients with inflammatory bowel disease with expression localized to the nucleus of epithelial and lamina propria mononuclear cells in lesions. Culturing mononuclear cells or colonic tissue with SP600125 down-regulated inflammatory cytokine production. Prophylactic treatment with SP600125 significantly reduced clinical and pathological scores in dextran sulfate sodium-treated rats. This first demonstration of the pathogenetic role of Jun-N-terminal kinase in the development of intestinal inflammation suggests that inhibiting its phosphorylation could benefit patients with inflammatory bowel disease. 相似文献
83.
Hippocampal cell loss in posttraumatic human epilepsy 总被引:13,自引:0,他引:13
Swartz BE Houser CR Tomiyasu U Walsh GO DeSalles A Rich JR Delgado-Escueta A 《Epilepsia》2006,47(8):1373-1382
PURPOSE: We performed this study to determine whether significant head trauma in human adults can result in hippocampal cell loss, particularly in hilar (polymorph) and CA3 neurons, similar to that observed in animal models of traumatic brain injury. We examined the incidence of hippocampal pathology and its relation to temporal neocortical pathology, neuronal reorganization, and other variables. METHODS: Twenty-one of 200 sequential temporal lobectomies had only trauma as a risk factor for epilepsy. Tissue specimens from temporal neocortex and hippocampus were stained with glial fibrillary acidic protein (GFAP) and hematoxylin and eosin (H&E). Eleven hippocampal specimens had additional analysis of neuronal distributions by using cresyl violet and immunolabeling of a neuron-specific nuclear protein. RESULTS: The median age at onset of trauma was 19 years, the median time between trauma and onset of seizures was 2 years, and the median epilepsy duration was 16 years. The length of the latent period was inversely related to the age at the time of trauma (r=0.75; Spearman). The neocortex showed gliosis in all specimens, with hemosiderosis (n=8) or heterotopias (n=6) in some, a distribution differing from chance (p=0.02; Fisher). Hippocampal neuronal loss was found in 94% of specimens, and all of these had cell loss in the polymorph (hilar) region of the dentate gyrus. Hilar cell loss ranged from mild, when cell loss was confined to the hilus, to severe, when cell loss extended into CA3 and CA1. Some degree of mossy fiber sprouting was found in the dentate gyrus of all 10 specimens in which it was evaluated. Granule cell dispersion (n=4) was seen only in specimens with moderate to severe neuronal loss. CONCLUSIONS: Neocortical pathology was universally present after trauma. Neuronal loss in the hilar region was the most consistent finding in the hippocampal formation, similar to that found in the fluid-percussion model of traumatic head injury. These findings support the idea that head trauma can induce hippocampal epilepsy in humans in the absence of other known risk factors. 相似文献
84.
85.
Miura S Shibata H Kida H Noda K Tomiyasu K Yamamoto K Iwaki A Ayabe M Aizawa H Taniwaki T Fukumaki Y 《Journal of the neurological sciences》2008,273(1-2):88-92
We studied a four-generation pedigree of a Japanese family with hereditary neuropathy to elucidate the genetic basis of this disease. Twelve members of the family were enrolled in this study. The clinical features were neurogenic muscle weakness with proximal dominancy in the lower extremities, sensory involvement, areflexia, fine postural tremors, painful muscle cramps, elevated creatine kinase levels, recurrent paroxysmal dry cough, and neurogenic bladder. We performed a genome-wide search using genetic loci spaced at about 13 Mb intervals. Although nine chromosomes (1, 3, 4, 5, 6, 10, 17, 19, and 22) had at least one region in which the logarithm of odds (LOD) score was over 1.0, no loci fulfilled the criteria for significant evidence of linkage. Moreover, we analyzed an extra 14 markers on 3p12-q13 (the locus of hereditary motor and sensory neuropathy, proximal dominant form) and an extra five markers on 3p22-p24 (the locus of hereditary sensory neuropathy with chronic cough) and observed LOD scores of <-3 on both 3p12-q13 and 3p22-p24. Mutation scanning of the entire coding regions of the MPZ and PMP22 genes revealed no mutations. We conclude that the disorder described here is a newly classified hereditary motor and sensory neuropathy with autosomal dominant inheritance. 相似文献
86.
Wang F Tahara T Arisawa T Shibata T Nakamura M Fujita H Iwata M Kamiya Y Nagasaka M Takahama K Watanabe M Hirata I Nakano H 《Journal of gastroenterology and hepatology》2007,22(6):925-929
BACKGROUND AND AIM: Ulcerative colitis (UC) is a multifactorial disease resulting from a complex interaction of genetic and environmental factors. Identifying genetic variants that alter the innate immune response is highly relevant to understanding the pathogenesis of UC. The aim of this study was to investigate the association between CD14 and Toll-like receptor-2 (TLR2) genetic polymorphisms and chronic UC in Japanese patients. METHODS: The study population consisted of 102 chronic UC patients and 146 healthy control subjects. Polymorphisms in the promoter at C-260T of CD14 gene were investigated by PCR restriction fragment length polymorphism, and -196 to -174 del of TLR2 was investigated by allele-specific PCR. RESULTS: The frequencies of CD14 TT and T carrier were significantly higher in UC patients than in controls (TT: OR = 3.98, 95% CI 1.82-8.71, P = 0.0005; T carrier: OR = 2.98, 95% CI 1.47-6.01, P = 0.002). In addition, TT and T carrier were more closely associated with distal colitis phenotype (TT: OR = 7.78, 95% CI 2.14-28.28, P = 0.0007; T carrier: OR = 6.30, 95% CI 2.71-14.58, P = 0.005), onset after 20 years of age (TT: OR = 5.28, 95% CI 2.18-12.79; T carrier: OR = 3.79, 95% CI 1.67-8.59), chronic continuous type (TT: OR = 4.26, 95% CI 1.56-11.64; T carrier: OR = 3.09, 95% CI 1.33-7.82), and fewer than two hospitalizations (TT: OR = 4.44, 95% CI 1.81-10.89; T carrier: OR = 3.26, 95% CI 1.43-7.27). There was no significant difference in TLR2 -196 to -174 del/del and del/ins carrier frequencies between UC patients and healthy controls. However, these frequencies were significantly higher in steroid-dependant patients than in controls (del/del: OR = 6.08, 95% CI 1.41-26.21; del carrier: OR = 3.00, 95% CI 1.13-7.98). CONCLUSION: The results suggest that existence of a mutation in the CD14 gene is associated with an increased susceptibility to developing UC, especially chronic continuous distal colitis phenotypes that develop after 20 years of age. Furthermore, polymorphism of TLR2 may be related to an increased risk of intensive types such as steroid-dependent patients. 相似文献
87.
88.
Tomomitsu Tahara Tomoyuki Shibata Masakatsu Nakamura Hiromi Yamashita Daisuke Yoshioka Masaaki Okubo Naoko Maruyama Toshiaki Kamano Yoshio Kamiya Hiroshi Fujita Yoshihito Nakagawa Mitsuo Nagasaka Masami Iwata Kazuya Takahama Makoto Watanabe Ichiro Hirata Tomiyasu Arisawa 《Digestive diseases and sciences》2009,54(11):2391-2398
DNA methylation is one of the major events in the early process of gastric carcinogenesis and it also occurs in non-neoplastic gastric mucosa. MTHFR plays a central role in biotransformation of folate to form S-adenosylmethionine, the universal methyl donor in cells and affects DNA methylation status. We investigated the association between common functional polymorphism of MTHFR C677T and DNA methylation status in H. pylori-infected non-neoplastic gastric mucosa. For 99 gastric mucosa samples from H. pylori positive non-cancer subjects, we assessed the association between MTHFR C677T genetic polymorphism and promoter methylation status of the four candidate promoters (p14, p16, DAP-kinase, and CDH1). In most all of the subjects, weak correlation was found between the p16 promoter methylation and MTHFR 677T carriers (age, sex-adjusted OR = 2.57, P = 0.053). When subjects were divided into two groups according to age, the MTHFR T carrier held a significantly higher risk of p16 promoter methylation, especially in 66 years or older generation (sex-adjusted OR = 14.28, P = 0.02). In addition, mean number of methylated CpG cites were significantly higher in T carrier than CC genotype in the same generation (P = 0.0418). Our data suggest that MTHFR 677T carrier influences the risk of DNA methylation in gastric mucosa in the long-term outcome of the H. pylori infection. 相似文献
89.
Tahara T Arisawa T Shibata T Nakamura M Yamashita H Yoshioka D Okubo M Maruyama N Kamano T Kamiya Y Fujita H Nagasaka M Iwata M Takahama K Watanabe M Nakano H Hirata I 《Digestive diseases and sciences》2009,54(6):1247-1252
Background A complex interaction of host genetic and environmental factors may be relevant in the development of Helicobacter pylori (H. pylori)-related gastro-duodenal diseases. RANTES is a potent chemoattractant peptide for memory T lymphocytes and eosinophils, and
has been shown to be enhanced in H. pylori-infected gastric mucosa. We aimed to clarify the effect of RANTES functional promoter polymorphism on the risk of gastro-duodenal
diseases in a Japanese population. Methods Four hundred and eighty-three subjects, comprising 106 gastric ulcer, 52 duodenal ulcer, and 325 non-ulcer subjects, were
included in this study. Restriction fragment length polymorphism (RFLP) analysis was performed for polymorphisms at −28 C/G
in the RANTES gene promoter region. Gastritis scores of antral gastric mucosa were assessed according to the updated Sydney
system. Results There were no significant differences in the RANTES promoter genotype distributions among non-ulcer subjects, ulcer patients,
and gastric and duodenal ulcers. However, the degree of intestinal metaplasia was significantly lower among G carriers in
H. pylori-infected subjects aged 60 years or older (C/C vs. G carriers; 1.28 ± 1.02 vs. 0.83 ± 0.89, P = 0.0357). In addition, we also found that the same genotype held a lower risk of more severe intestinal metaplasia in H. pylori-infected female subjects (C/C vs. G carriers; 0.91 ± 1.03 vs. 0.41 ± 0.73, P = 0.0443). Conclusion The polymorphism of RANTES promoter is not associated with the susceptibility to peptic ulcer diseases, but the −28 G carrier
is associated with a reduced risk of developing more severe intestinal metaplasia in H. pylori-positive subjects aged 60 years and older and in female subjects. 相似文献
90.
Induction of apoptosis by isoflavonoids from the leaves of Millettia taiwaniana in human leukemia HL-60 cells 总被引:2,自引:0,他引:2
We have isolated two new isoflavonoids, millewanin-F (1) and furowanin-A (2), together with five known isoflavonoids from the leaves of Millettia taiwaniana Hayata (Leguminosae) and examined their effects on the growth of human leukemia HL-60 cells. Among the isolated isoflavonoids, furowanin-A (2), warangalone (3), isoerysenegalensein-E (4), and euchrenone b10 (6) showed significant cytotoxicity against HL-60 cells. After treatment with three of the cytotoxic isoflavonoids, furowanin-A (2), warangalone (3), and isoerysenegalensein-E (4), fluorescence microscopy with Hoechst 33,342 staining revealed that the percentage of apoptotic cells with fragmented nuclei and condensed chromatin increased in a time-dependent manner. In addition, the activities of caspase-9 and caspase-3 were also enhanced in a time-dependent manner upon treatment with the isoflavonoids 2, 3, and 4. Caspase-9 and caspase-3 inhibitors suppressed apoptosis induced by isoflavonoids 2, 3, and 4. These results suggest that the isoflavonoids induced apoptosis in HL-60 cells through activation of the caspase-9/caspase-3 pathway, which is triggered by mitochondrial dysfunction. 相似文献