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Biomedical subjects

M Satomi

Publications and source records attributed to M Satomi.

At least 37 records · Page 2Linked to original sources
PubMed1998

Infiltration of peroxidase-producing eosinophils into the lamina propria of patients with ulcerative colitis.

Little information is available to explain the pathogenesis of ulcerative colitis (UC). In this study, we focused on eosinophils in the lamina propria of the mucosa of patients with UC in the active phase. Biopsy specimens were taken from 17 patients with UC in the active phase, 17 in the inactive phase, and 20 control patients, and submitted for histochemical staining for peroxidase and chloroacetate esterase for microscopic examination. Both peroxidase-producing and chloroacetate esterase-producing cells in the lamina propria increased markedly in the active phase (8.3 +/- 3.1/0.01 mm2 and 6.6 +/- 2.7/0.01 mm2, respectively), compared with values in the inactive phase (0.8 +/- 0.6/0.01 mm2 and 1.3 +/- 0.6/0.01 mm2) or in the controls (1.3 +/- 0.8/0.01 mm2 and 1.3 +/- 0.4/0.01 mm2). Triple staining for peroxidase, chloroacetate esterase, and nonspecific esterase in the specimens revealed that the peroxidase-producing cells constituted a different population from that of neutrophils, macrophages/monocytes, or basophils. A monoclonal antibody specific for eosinophil peroxidase stained almost all infiltrated peroxidase-producing cells. These results indicated that eosinophils with strong peroxidase activity had infiltrated the lamina propria in UC, suggesting an allergic background and the involvement of released peroxidase in the mucosal damage characteristic of UC.

Carboxylic Ester Hydrolases↗
PubMed1998

Marinospirillum gen. nov., with descriptions of Marinospirillum megaterium sp. nov., isolated from kusaya gravy, and transfer of Oceanospirillum minutulum to Marinospirillum minutulum comb. nov.

Two strains of helical, halophilic, Gram-negative, heterotrophic bacteria were isolated from kusaya gravy which is a traditional Japanese fermented brine. These strains were motile by means of a single polar or bipolar tuft flagellum. They had a large cell size, were helical, formed coccoid bodies, were microaerophilic and had quinone type Q-8. The DNA G + C content of the strains was 44-45 mol %. A detailed investigation of the phenotypic, chemotaxonomic and phylogenetic characteristics of the strains revealed that they represent a new species of halophilic helical bacteria. The sequence of the 16S rRNA gene of strain H7T, designated the type strain of the new isolates, and all of the Oceanospirillum species except for Oceanospirillum linum were determined. Phylogenetic analysis indicated that these strains were closely related to Oceanospirillum minutulum, with enough distance to separate the O. minutulum/new isolate H7T cluster from Oceanospirillum sensu stricto on the genus level. It is proposed that a new genus, Marinospirillum, be created; this genus should include Marinospirillum minutulum ATCC 19193T (formerly Oceanospirillum minutulum) as the type species, as well as Marinospirillum megaterium JCM 10129T (= H7T).

DNA, Bacterial↗
PubMed1997

Mucosal blood flow and generation of superoxide in rat experimental colitis induced by succinic acid.

As we consider succinic acid to be an exacerbating factor in ulcerative colitis, we investigated its influence on rat colonic mucosa in terms of mucosal blood flow and superoxide generation. We measured mucosal blood flow by the hydrogen gas clearance method and superoxide generation by the chemiluminescence method, and observed histopathological findings to determine the effects of succinic acid. After the instillation of succinic acid of any concentration tested to the colon, mucosal blood flow decreased. Histopathologically, the higher the concentration of succinic acid, the greater was the erosion formation in the colonic mucosa, while significant polymorpho-nuclear cell infiltration superoxide generation from colon tissue were observed with 0.01% succinic acid compared with higher or lower concentrations. Succinic acid, at fecal concentrations found in active stage ulcerative colitis, appears to be implicated in mucosal injury, mediated by a decrease in colonic mucosal blood flow and infiltration of superoxide-generating polymorpho-nuclear cells into the mucosa.

Animals↗
PubMed1997

Tetragenococcus muriaticus sp. nov., a new moderately halophilic lactic acid bacterium isolated from fermented squid liver sauce.

A total of 11 strains of moderately halophilic histamine-producing bacteria isolated from fermented squid liver sauce were studied phenotypically, genotypically, and phylogenetically. These strains are considered members of the genus Tetragenococcus based on their physiological, morphological, and chemotaxonomic characteristics. A 16S rRNA gene sequence analysis showed that these strains clustered with, but were separate from, Tetragenococcus halophilus. The results of DNA-DNA hybridization experiments indicated that the new isolates represent a new Tetragenococcus species, for which we propose the name Tetragenococcus muriaticus; strain X-1 (= JCM 10006) is the type strain of this species.

Animals↗
PubMed1997

Leukocytapheresis with leukocyte removal filter as new therapy for ulcerative colitis.

Leukocytapheresis (LCAP) with a leukocyte removal filter column was administered for 45 patients with ulcerative colitis (UC). We evaluated changes in the leukocyte count and the differential percentages during LCAP. Cytokine production was assessed from each patient's peripheral mononuclear cells or monocytes. Flow cytometry was performed to assess the removal rates of activated cells and adhesion molecule positive cells by LCAP. Clinical improvement was recognized in 35 of 45 patients during intensive LCAP therapy, and it continued throughout maintenance therapy in 32 patients (71.1%). The leukocyte count was decreased to about 40% during the first 30 min, but it increased to approximately 170% at 20 min after the completion of LCAP. The concentration of tumor necrosis factor (TNF)alpha before LCAP in the effective group was higher than it was in either the ineffective group or the control group. Its level decreased to near normal range after LCAP. In the effective group, the concentrations of interleukin (IL)-1beta, IL-2, interferon (IFN)gamma, and IL-8 were near the normal upper limits before LCAP; however, they had decreased after LCAP. The concentration of IL-4 increased after LCAP. In the ineffective group, in contrast, the concentrations had been at or near normal before the initial LCAP treatment. Flow cytometry study revealed that LCAP could remove the activated cells and adhesion molecule positive cells more effectively. The clinical improvement and the changes observed before and after LCAP therapy suggest that LCAP is able to intervene in the causal mechanism(s) of UC.

Blood Cell Count↗
PubMed1997

[Remission by leukocytapheresis for a patient with ulcerative colitis found refractory by conventional drug therapies].

A 40-year-old male was admitted to our hospital on August 30, 1994 to receive a new ulcerative colitis (UC) therapy, leukocytapheresis (LCAP). On the admission day, he had bloody stool 5 to 6 times/day, abdominal pain, slight fever, and hypoproteinemia. His UC type was moderately severe left-sided colitis with pseudopolyposis. Prior to admission to our hospital, his condition had not improved for about 9 months, despite drug therapies such as salicylazosulphapyridine, intravenous high dose prednisolone, protease inhibitor, intraarterial hydrocortisone sodium succinate, 4 series of pulse therapies with metylpredonisolone, enema of corticosteroid, azathioprine (Imuran), and cyclosporine at another hospital. Thus he was introduced to our college hospital and treated by LCAP since September 1. After 10 LCAP sessions, remission was observed and the patient discharged on December 23. Until he was later operated on for heavy bleeding after he had discontinued treatment and had drunk heavily, he had maintained remission for 13 months with LCAP only once a month even after we gradually decreased the other medical supports and stopped all of them. After LCAP, the normalization of high percentage of leukocytes presented HLADR+ and lymphocytes presented CD 11 a+ CD 8+ was also observed. This suggests LCAP intercepts the excess immune reaction in UC by removing leukocytes.

Adult↗
PubMed1997

[Leukocytapheresis for ulcerative colitis].

Major inclusion criteria for leukocytapheresis (LCAP) therapy were mainly insufficient response to conventional drugs therapy. LCAP was administered once a week for 5 weeks of intensive therapy and once approximately a month for maintenance therapy, for 38 patients with UC. LCAP could remove approximately 1 x 10(10) white blood cells in each session. In the evaluation, we classified the response to the LCAP as: 1) excellent, 2) moderately improved, 3) no change, and 4) deterioration. Clinical improvement was recognized in 29 of 38 patients (76%) including 8 with dramatic response during the intensive therapy, and continued throughout the maintenance therapy in 26 patients (68.4%). Even though their symptoms were mild, the patients with more than 5 years UC history seemed to be not effective. The patients with moderately improvement and with excellent response have kept remission for about 20 months and about 2.5 years on an average, respectively. Clinical and blood examinations showed no side effects in any cases. It suggests that LCAP is able to be a UC treatment between drug therapies and an operation.

Adult↗
PubMed1996

Carcinoid tumor of the gall bladder.

A classical carcinoid tumor, measuring 11 x 17 mm, was found in a 41-year-old woman in the neck of the gall bladder. The lesion infiltrated the muscular layer of the gall bladder wall. Histologically, the tumor was positive for only Grimelius and chromogranin A stains. In a literature search, approximately half of the tumors reported as gall bladder carcinoid tumor appear to be actually endocrine cell carcinomas, which are completely different from classical carcinoid tumors with respect to size, metastasis and prognosis. These carcinomas should not be termed as carcinoid tumors from both the clinical and histological points of view, and should be clearly distinguished from benign lesions when reported.

Adult↗
PubMed1995

Leukocytapheresis therapy, performed with leukocyte removal filter, for inflammatory bowel disease.

Leukocytapheresis (LCAP), performed with a leukocyte removal filter, was administered five times, at 1-week intervals, for 5 weeks of intensive therapy and five times, at approximately 1-month intervals, for approximately 5 months of maintenance therapy, to 13 patients with inflammatory bowel disease (IBD) diagnosed as ulcerative colitis (UC) in 8 and Crohn's disease (CD) in 5. Clinical and blood examinations showed no side effects in any of the patients. During the intensive therapy, excellent or moderate clinical response was recognized in 11 of the 13 patients (84.6%), of whom 6 had a dramatic response; the excellent or moderate clinical response continued throughout the maintenance therapy in 8 of the patients (61.5%). Flow cytometry showed that the patients who had improved generally had high values for percentages of HLADR+, HLADR+CD3+, and HLADR+CD8+ cells before the first LCAP, and that these values and the C-reactive protein levels and erythrocyte sedimentation rates had decreased to the normal range by the end of both intensive and maintenance therapy. In the patients who showed poor response, in contrast, all the above values had been at or near normal before the initial LCAP administration. The clinical improvement in the absence of any additional medical treatment suggests that LCAP has the capacity to influence the causal mechanism(s) of IBD and that IBD is strongly associated with the cell-mediated immune response.

Adolescent↗
PubMed1995

Leukocytapheresis therapy with leukocyte removal filter for inflammatory bowel disease.

Leukocytapheresis (LCAP) with a leukocyte removal filter was administered to 44 patients with inflammatory bowel disease (IBD), diagnosed as ulcerative colitis (UC) in 25 and Crohn's disease (CD) in 19. Clinical and blood examinations showed no side effects in any of the patients. During intensive therapy, clinical improvement was recognized in 21 of the 25 UC patients (84%), 8 of whom had an excellent response, and in 16 of the 19 CD patients (84.2%), 4 of whom had an excellent response. The clinical improvement continued throughout the maintenance therapy in 19 of the UC patients (76%) and in 12 of the CD patients (63.2%). In both the UC and the CD patients, flow cytometry study showed that those who had improved generally had high values for the percentages of HLADR+, HLADR+CD3+, HLADR+CD8+, and CD11a+CD8+ cells before the first LCAP, and that these values decreased to near the normal range after both intensive and maintenance therapy. In the patients who showed poor response, in contrast, the values had been at or near normal before the initial LCAP administration. The clinical improvement and the findings on flow cytometry suggest that LCAP exerts an immuno-modulatory effect and is an effective therapy for patients with IBD in whom conventional drug treatments have failed.

Case-Control Studies↗
PubMed1994

Effects of cytotoxic factors of Helicobacter pylori on superoxide generation in situ in the rabbit stomach.

OBJECTIVE: To evaluate the effect of certain cytotoxic products of Helicobacter pylori on superoxide generation in situ and on the infiltration by polymorphonuclear cells into the gastric mucosa. The agents studied were ammonia, a culture supernatant of H. pylori, and N-formyl-methionyl-leucyl-phenylalanine (FMLP), a chemotactic factor. METHODS: One or two of these agents were dripped onto rabbit gastric epithelium. The number of polymorphonuclear cells in gastric mucosa were counted histologically. Superoxide generation was measured by a chemiluminescence method, using a Cypridina luciferin analog, 2-methyl-6-phenyl-3,7-dihydroimidazo[1,2-alpha]pyrazin-3-one , a chemiluminescence probe that responds to the generation of superoxides and singlet oxygen radicals. Bovine erythrocyte copper zinc superoxide dismutase was dripped to confirm that the increase in photon counts was a direct consequence of the generation of superoxides. RESULTS: The greatest infiltration of polymorphonuclear cells into the gastric mucosa was observed with the administration of 1 mmol/l FMLP followed by 5.9 mmol/l ammonia, and 10 mmol/l FMLP followed by 59 mmol/l ammonia. There was no increase in the number of polymorphonuclear cells in the other experiments. Increased chemiluminescence was observed in conjunction with the infiltration of polymorphonuclear cells and was inhibited by superoxide dismutase. CONCLUSIONS: Acute gastritis and superoxide generation in situ were induced by ammonia after pretreatment with FMLP.

Ammonia↗