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Biomedical subjects

M Uchida

Publications and source records attributed to M Uchida.

At least 325 records · Page 18Linked to original sources
PubMed1990

Reduction of leukemia cell growth in a patient with acute promyelocytic leukemia treated by retinol palmitate.

A 67-year-old woman with acute promyelocytic leukemia (APL) showed a marked decrease in leukemic promyelocytes with concomitant maturation of leukemic cells during treatment with retinol palmitate. A culture study in vitro revealed that retinol, which is the main metabolite of retinol palmitate detected in plasma, induced morphological and functional maturation of leukemic promyelocytes. These findings may indicate that retinol palmitate induces cell differentiation and slows proliferation of leukemic cells in vivo, and that the reduction in cell growth is the key phenomenon in the clearing of leukemic cells, rather than the maturation phenomenon itself.

Aged↗
PubMed1990

A new multilayered composite hollow fiber membrane for artificial lung.

The gas transfer performances in a gas/membrane/liquid system were investigated in detail with various membranes. It was found that the oxygen flux in the gas/membrane/liquid system was saturated when the oxygen flux (Fg-g) in the gas/membrane/gas system became more than 1.0 x 10(-5) cm3 (STP) cm-2s-1cm Hg-1 (Fcg-g). This was explained as follows: The resistance of a boundary layer at liquid phase is dominant, i.e., the membrane resistance is negligible in the region of Fg-g which is greater than Fcg-g. Consequently, Fg-g of the membrane should be designed to be greater than Fcg-g, in order to satisfy the gas transfer performance required for blood oxygenation. On the basis of the results above, we have developed a new three-layered composite hollow fiber membrane (MHF) consisting of an ultrathin polyurethane layer supported between two microporous polyethylene layers to prevent serum leakage. It was shown through the evaluation in vitro that MHF had good gas transfer performances for long-term perfusion, and no serum leakage was observed. These characteristics suggest that MHF is quite suitable for long-term usage such as extracorporeal membrane oxygenation (ECMO).

Artificial Organs↗
PubMed1990

Change in formation of gastric lesions by aspirin during aging in rats.

Formation of gastric lesions induced by orally administered aspirin (100 mg/kg) was examined in 4 to 86 week-old Sprague-Dawley male rats. Gastric mucosal prostaglandin I2 level and gastric secretion in basal state were also examined in these rats. Gastric mucosal PGI2 level was measured by bioassay and gastric secretion was collected by the pyloric ligation method for 4 h. Gastric lesions reached the maximum value in 7 week-old, and lowest in 60 week-old. Acid output also reached the maximum value in 7 week-old. As for PGI2 level, it showed the maximum value in 20 week-old, and moderately decreased thereafter. In 86 week-old, PGI2 level was further lowered to about 35% of 20 week-old rats. A linear positive correlation was noted between formation of aspirin-induced gastric lesion and acid secretion. From these results, it was concluded that formation of gastric lesions by aspirin was closely related to acidity of the gastric secretion. It was also suggested that in aged rats, aspirin-induced gastric lesions may at least partly be associated with the reduced PGI2 level.

Aging↗
PubMed1990

Synthesis and antiulcer activity of 4-substituted 8-[(2-benzimidazolyl)sulfinylmethyl]-1,2,3,4-tetrahydroquinoli nes and related compounds.

A series of 4-substituted 8-[(2-benzimidazolyl)sulfinylmethyl]-1,2,3,4-tetrahydroquinolin es was synthesized and examined for their (H+ + K+)adenosine triphosphatase (ATPase)-inhibitory and antisecretory activities against histamine-induced gastric acid secretion in rats. Many compounds tested were potent inhibitors of (H+ + K+)ATPase. Most compounds showed antisecretory activity. The antiulcer activity against water-immersion stress-induced gastric ulcer, aspirin-induced gastric ulcer and gastric necrosis induced by hydrochloric acid also were tested in the rat. Some of these compounds, in particular, 4-(N-allyl-N-methylamino)-1-ethyl-8-[(5-fluoro-6-methoxy-2-benzimidazoly l) sulfinylmethyl]-1-ethyl-1,2,3,4-tetrahydroquinoline (XVIIx) were found to have potent activity. The structure-activity relationships are discussed.

Adenosine Triphosphatases↗
PubMed1990

Synthesis and antibacterial activity of the metabolites of 9-fluoro-6,7-dihydro-8-(4-hydroxy-1-piperidyl)-5-methyl-1-oxo-1H,5H- benzo[i,j]quinolizine-2-carboxylic acid (OPC-7251).

The metabolites of 9-fluoro-6,7-dihydro-8-(4-hydroxy-1-piperidyl)-5-methyl-1-oxo-1H,5H- benzo[i,j]quinolizine-2-carboxylic acid (OPC-7251) (1), which has a potent antibacterial activity against gram-positive bacteria, characteristically Propionibacterium acnes, were synthesized to confirm their structures and to examine their antibacterial activity. The structures of three major metabolites (2, 3a and 4) were identified by means of comparison with the synthetic compounds. The antibacterial activity of the metabolites (2, 3a and 4) was found to be lower than that of 1.

Anti-Bacterial Agents↗
PubMed1990

[Effect of anti-ulcer drugs and PGE2 on the proliferation of rat gastric cultured cells].

The effects of anti-ulcer drugs and PGE2 on the proliferation of rat gastric cultured cells were investigated. To study the cell proliferation, the rate of incorporation of 3H-thymidine into the cultured cells was measured. ULTROSER G, corresponding to fetal bovine serum, was found to dose-dependently increase the incorporation of 3H-thymidine into the cultured cells at a dose range of 1-4%. The incorporation of 3H-thymidine was highest at 36 hr after the inoculation of cells. Therefore, the effect of the drugs on the proliferation was performed under the condition of 2% ULTROSER G and evaluated at 36 hr. Aldioxa, cetraxate HCl, cimetidine (10(-7)-10(-5) M) and PGE2 (10(-8)-10(-6) M) had no effect on the cell proliferation, while indomethacin (0.35-1.41 x 10(-3) M) inhibited the proliferation in a dose-dependent manner. Aldioxa, cetraxate HCl (10(-5) M) and PGE2 (10(-6), 10(-8) M) antagonized the inhibitory effect by indomethacin at a concentration of 0.5 x 10(-3) M, but cimetidine (10(-7)-10(-5) M) did not. From the above results, it was concluded that this method was useful for investigating the effect of drugs on the proliferation of gastric cultured cells.

Animals↗
PubMed1990

[The effect of aldioxa on the formation of gastritis induced with sodium hydroxide].

The effects of aldioxa and cetraxate hydrochloride on the formative process of gastritis induced with intragastric application of 2% sodium hydroxide were studied. Rats were given food including either aldioxa or cetraxate hydrochloride for 6 weeks after the sodium hydroxide application. After sacrifice, the stomachs were removed, and the gastric mucosa were observed macroscopically and histologically. Gastric mucosal injury was widely induced with sodium hydroxide, being histologically characterized by mucosal hypertrophy, cell infiltration and intestinal metaplasia. These lesions seem to be the early stage of chronic gastritis. The aldioxa group showed a decrease of mucosal hypertrophy and cell infiltration as compared with the control group. In the cetraxate hydrochloride group, the mucosal surface of white gray color and the mucosal bosselation were observed macroscopically. Histologically, these were found to be cell infiltration and cyst formation. Moreover, intestinal metaplasia occurred at high incidence in this group. These findings in the cetraxate hydrochloride group are recognized to be an aggravation of chronic gastritis. From the above results, it is suggested that aldioxa promotes good regeneration of mucosa and should be useful for the clinical therapy of chronic gastritis.

Allantoin↗
PubMed1990

Clinicopathologic features and long-term results of alpha-fetoprotein-producing gastric cancer.

During a 10-yr-period, 24 cases of alpha-fetoprotein-producing gastric cancer were experienced in our department. The mean age was 62.5 yr, and the sex ratio of males to females was 3:1. Borrmann II and III types of gastric cancer were predominant (83.3%). The prognosis was dismal. Most of the patients, including three radically operated cases of early gastric cancer, died from liver metastasis within 2 yr. The 1-, 3-, and 6-yr survival rates were 37.5%, 8.3%, and 8.3%, respectively, for all cases and 75.0%, 25.0%, and 25.0% for radically operated cases. The incidences of synchronous and metachronous liver metastasis were 31.8% and 40.9%, significantly higher than the incidences of AFP-negative gastric cancer (p less than 0.91). Despite radical gastrectomy, metachronous liver metastasis occurred in 75.0% of the cases. Two radical hepatic resections, including extended right lobectomy, were performed in one patient with early gastric cancer who had repeated metachronous liver metastasis. However, the tumor recurred immediately. Apparently, radical gastrectomy or hepatic resection alone may not suffice for this particular type of cancer. The methods of treatment and follow-up considered should be different from that for other types of gastric cancer.

Adult↗
PubMed1990

[The characters of AFP-producing early gastric cancer].

During the last decade, we have experienced 525 cases of gastric cancer. Within these, 195 were early gastric cancer (37.1%). Five and eight year survival rates were 86.9 and 77.2%. There were seven cases of recurrence, all of which were liver metastasis of submucosal cancers. Two combined with pulmonary metastasis. Three of the recurrent cases had serum AFP raised (greater than 20ng/ml) before or after partial gastrectomy. When these gastric specimens were reviewed, AFP positive cells were stained by PAP method. Compared with the AFP negative group of 168 early gastric cancers, invasion of lymphatic and venous vessels of the stomach and incidence of the liver metastasis were significantly higher in the stained group. 1.3 and 4.5 year survival rates of the cases (including ours) of AFP producing early gastric cancer, which had been reported in Japanese literatures, were 76.1, 45.7 and 22.9%, respectively. Liver metastasis was found in 7 of 12 cases (58.3%). It is clear that AFP producing early gastric cancer has the same tendency for liver metastasis as the AFP producing advance gastric cancer does. To prevent its recurrence, early diagnosis by PAP method for specimens with hepatic picture and aggressive adjuvant chemotherapy are mandatory.

Aged↗
PubMed1990

[Malignant lymphoma with acute renal failure and nephrotic syndrome].

A case of non-Hodgkin's lymphoma with nephrotic syndrome and acute renal failure is described. A 60-year-old Japanese male was admitted to our hospital in November, 1988, because of lymphadenopathy, fever, night sweat, weight loss. On physical examination, lymphadenopathy was present in both cervical, submandibular, supraclavicular, axillary and inguinal regions. The leukocyte count was 9,700/microliters with 85% neutrophils and 2% atypical lymphocytes. Renal function was normal. Lymph node biopsy showed non-Hodgkin's lymphoma of diffuse, large cell type. Immunohistologic examination showed T cell type. A few days later, he fell into acute renal failure. After systemic chemotherapy, he showed prompt improvement in renal function. Echo and computerized tomography (CT) of abdomen revealed no compression of the ureters and bladder. Renal biopsy findings suggested mesangium proliferative glomerulonephritis without invasion of tumor cells. Our case seemed to be rare and was compared with previous reports.

Acute Kidney Injury↗
PubMed1990

[Relationship between molecular structure of halogenated methane compounds and their hypotensive effect in rats].

In this study gases of twelve halogenated methane compounds were administered by inspiration to Wistar rats in order to elucidate the relationship between molecular structure of the compounds and their hypotensive effect, and to develop new inhalational circulatory control agents. The correlation between the hypotensive effect of the compounds evaluated from the experimental data and computed van der Waals volume as well as surface area following molecular mechanics calculations of structure and energy, was investigated. The results showed that the compounds with van der Waals volume and surface area more than 73 A3 and 100 A2, respectively, had the hypotensive effect. In conclusion, our data suggest that the hypotensive effect of inhalational agents requires greater molecular sizes than regular ones.

Administration, Inhalation↗
PubMed1990

[Blastic crisis of primary myelofibrosis associated with multiple myeloblastomas ].

The patient is a 71-year-old female who underwent splenectomy due to splenomegaly 32 months after diagnosed as having primary myelofibrosis. On examination she was found to have massive skin nodules, lymph nodes swelling and an enlarged liver with an abnormal hematologic profile as follows: RBC count 3.68 x 10(6)/microliters; WBC count 151 x 10(3)/microliters with 11% blasts; and platelet count 42 x 10(3)/microliters. The bone marrow aspirate showed a hypocellular marrow with 19.2% blasts. Histological examination of the skin nodules revealed that they were myeloblastomas, thus suggesting leukemic transformation of primary myelofibrosis. Her WBC count dropped to about 20 x 10(3)/microliters through treatment with vindesine, cyclophosphamide, 6-mercaptopurine and prednisolone, but it did not drop further. Treatment with dexamethasone remarkably regressed the myeloblastomas, but she died of heart failure 4 months after diagnosis of leukemic transformation of primary myelofibrosis. The autopsy findings showed the formation of numbers of myeloblastomas in both the systemic fatty tissue and dura mater as well as extramedullary hematopoiesis in liver and lymph nodes. A rapid development of splenomegaly in a patient with primary myelofibrosis seems to be associated with leukemic transformation.

Aged↗
PubMed1990

[MR imaging of bone and soft tissue tumors].

One hundred sixty-one patients with tumors of bone or soft tissues underwent MRI. We believe to be able to differentiate benign from malignant lesions on the basis of imagings at internal, marginal, and peripheral properties. MR imagings demonstrated specific morphologic features that suggest the correct tissue diagnosis. MR imagings with STIR method or Gd-DTPA were more valuable. Because of the high contrast between the tumors and normal tissue, especially by STIR method, MRI provides improved detection and delineation of bone soft tissue tumors when compared to other diagnostic modalities.

Bone Neoplasms↗
PubMed1990

[Vesico-prostatic calculi treated by microexplosion lithotripsy: a case report].

A 48-year-old male suffering from neurogenic bladder due to spinal injury was admitted to our clinic with a chief complaint of macrohematuria. Examinations revealed some calculi located in the bladder and in the prostate. Microexplosion lithotripsy for the prostatic calculi (29 x 23 mm etc.) was performed via the urethra and for the vesical calculus (65 x 55 mm) via the suprapubic cystostomy channel. The calculi were fragmented and removed out completely.

Calculi↗
PubMed1990

[Idiopathic plasmacytic lymphadenopathy with polyclonal hyperimmunoglobulinemia (IPL) accompanied with severe thrombocytopenia and interstitial pneumonitis].

A case of generalized lymphadenopathy with severe thrombocytopenia and marked polyclonal hypergammaglobulinemia is reported. A 51-year-old man was admitted to the hospital because of nasal bleeding and generalized lymphadenopathy. Laboratory examination revealed a platelet count of 6,000/microliters, a total protein level of 11.6 g/dl, and a gammaglobulin level of 8.7 g/dl including 6,726 mg/dl IgG, 1,119 mg/dl IgA, 265 mg/dl IgM, 265 mg/dl IgD and 226 IU/ml IgE. Neither definite evidence suggesting viral infection nor an autoimmune disease was found except slightly elevated titers of anti-microsome and anti-thyroglobulin antibodies. The chest X-ray revealed diffuse reticular shadowing suggesting interstitial pneumonitis. The cervical lymph node biopsy revealed massive infiltration by IgG-, IgA-, and IgM-positive plasmocytoid cells in the paracortical T cell areas, but no destruction of normal architecture of lymph node. The treatment with prednisolone resulted in a decrease in the severity of the lymphadenopathy, thrombocytopenia and polyclonal hypergammopathy. He is still well; however, interstitial pneumonitis, mild thrombocytopenia, and polyclonal hypergammopathy have persisted for 4 years. The histological findings in this case are similar to those in the case of Castleman lymphoma of a plasma cell type. Thus, considering the clinical data and clinical course, the diagnosis in this case is likely to be idiopathic plasmacytic lymphadenopathy with polyclonal hyperglobulinemia as a subtype of the plasma cell type of Castleman lymphoma. However, the accompanying interstitial pneumonitis and the severe thrombocytopenia, which was caused by excessive platelet destruction or by the suppression of megakaryocytes by proliferated plasma cells, are unique and are not found in any of the previously reported cases.

Humans↗
PubMed1990

Biological effect of orally active platelet-activating factor receptor antagonist SM-10661.

SM-10661 [(+/-)-(cis)-3,5-dimethyl-2-(3-pyridyl)thiazolidin-4-one HCl] displayed marked in vitro inhibition of rabbit platelet aggregation induced by 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine (alkyl-PAF), 1-O-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine (C16-PAF), and 1-O-octadecyl-2-acetyl-sn-glycero-3-phosphocholine, with IC50, values of 5.50, 5.94, and 3.68 microM, respectively. It also inhibited alkyl-PAF-induced aggregation of human platelets with an IC50 of 3.00 microM, but it did not inhibit platelet aggregation induced by ADP, collagen, arachidonic acid, the thromboxane A2 agonist U46619, or the Ca ionophore A23187, at concentrations up to 400 microM. Furthermore, SM-10661 antagonized [3H]-C16-PAF binding to rabbit platelets competitively, with an IC50 of 1.0 microM. SM-10661 protected against alkyl-PAF-induced lethality in mice with an ID50 of 6.0 mg/kg intravenously or 24 mg/kg orally. In guinea pig, SM-10661 inhibited the alkyl-PAF (0.1 micrograms/kg)-induced increase in bronchial pressure, with an ID50 of 0.7 mg/kg intravenously or 15 mg/kg orally. Bronchial hyperreactivity to bombesin after the infusion of alkyl-PAF was also inhibited dose-dependently by the infusion of SM-10661, with an ID50 of 25 mg/kg. In addition, SM-10661 inhibited alkyl-PAF (0.01 micrograms/kg)-induced hypotension in rats, with an ID50 of 0.36 mg/kg intravenously or 33 mg/kg orally. SM-10661, when given orally, showed rapid absorption and good duration of pharmacological activity in rats and rabbits.

Administration, Oral↗