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Biomedical subjects

M Ogata

Publications and source records attributed to M Ogata.

At least 415 records · Page 23Linked to original sources
PubMed1986

Cross-reactivity between haptenic muramyl di- or tripeptide derivatives and Mycobacterium bovis BCG: potential application for enhancing tumor immunity.

Muramyl di- or tripeptide (MDP or MTP) hapten derivatives bearing various structures were synthesized, and the correlation of these structures with cross-reactivity with Mycobacterium bovis BCG and their applicability to enhance induction of syngeneic tumor immunity were investigated. The cross-reactivity of MDP or MTP haptens to BCG was examined by T-cell proliferation responses of lymph node cells from BCG-primed C3H/He mice in the stimulation with MDP- or MTP-coupled syngeneic cells. A haptenic MDP derivative (designated L4-MDP) stimulated proliferative responses appreciably. Derivatives in which alanine in the peptide portion of L4-MDP was replaced by methylalanine or valine failed to induce stimulation. However, the cross-reactivity with BCG was regained in the MTP derivative that was formed by adding lysine to dipeptide containing methylalanine or valine. Whether this cross-reactive pattern was correlated with enhanced induction of tumor immunity was further investigated. According to the established protocol for the augmented induction of tumor immunity, BCG-primed C3H/He mice were immunized with various haptenic MDP-coupled syngeneic X5563 tumor cells. Immunization with tumor cells conjugating BCG-cross-reactive haptens resulted in enhanced tumor immunity, whereas immunization with tumor cells coupling non-cross-reactive haptens failed to produce anti-X5563 tumor immunity. These results indicate that the peptide portion in these haptenic structures is critical in the generation of BCG cross-reactivity leading to enhanced tumor immunity.

Acetylmuramyl-Alanyl-Isoglutamine↗
PubMed1986

Importance of anticomplement immunofluorescence antibody titration for diagnosing varicella-zoster virus infection in Bell's palsy.

Anticomplement Immunofluorescence was used for antibody titration against varicella-zoster virus (VZV) in 43 patients with peripheral facial palsy. Nine of 31 patients (29%) with Bell's palsy and eight of 12 patients (75%) with Ramsey-Hunt syndrome had anticomplement immunofluorescence antibody titres of greater than or equal to 1/10. On the other hand, none of 14 patients with herpes simplex virus (HSV) infection and 51 healthy adults showed anticomplement immunofluorescence antibody titres of greater than or equal to 1/10. The anticomplement immunofluorescence antibody titre in two patients with Ramsey-Hunt syndrome increased later and decreased sooner than the indirect immunofluorescence antibody titre, becoming undetectable at 66 and 104 days, respectively, after onset of the disease. There was no cross reaction between anti-VZV and anti-HSV antibodies in the patients who showed a positive antibody rise for VZV. As the acute stage of VZV infection is obscure in the patients with peripheral facial palsy without herpes the screening of anticomplement immunofluorescence antibody to VZV at titres greater than or equal to 1/10 may be useful for the diagnosis of VZV infection in patients with peripheral facial palsy.

Adult↗
PubMed1986

Expression of H-2 antigens and inducibility of antitumor immune responses in various tumor cell clones established from methylcholanthrene-induced fibrosarcomas.

A large number of fibrosarcoma cell lines was established in vitro from a tumor mass induced freshly by inoculating 3-methylcholanthrene (MCA) subcutaneously (sc) into C3H/HeN mice, and more than five clones were isolated from each cell line by the limiting dilution technique. The present study investigated a) qualitative and quantitative comparison of the immunogenicity [tumor-associated transplantation antigen (TATA) activity] of different tumor clones and b) the relationship between such immunogenicity and the expression of H-2 class I antigens. When TATA were compared between different clones from the same tumor, these TATA were revealed to be cross-reactive to each other. On the other hand, the comparison of TATA between clones from different tumors demonstrated the existence of individually unique TATA in these clones. In addition to qualitative heterogeneity of TATA from different tumors, the magnitude of immunogenicity was also heterogeneous in the individual clones established. Whether or not such quantitative heterogeneity of immunogenic strength was related to the expression of H-2 (class I) antigens was examined by flow microfluorometry studies using anti-H-2k antibodies. The results demonstrated that there was no correlation between TATA activity capable of inducing in vivo tumor resistance and the expression of H-2 antigens. This contrasted with parallelism between the expression of H-2 antigens and inducibility of cytotoxic T lymphocytes (CTL) or lysability of tumor cell clones by CTL. These results are discussed in the context of the cellular mechanism of tumor cell eradication in vivo and the regulation of cell surface H-2 expression in vitro and in vivo.

Animals↗
PubMed1986

[Comparative studies of antimicrobial agents against causative organisms isolated from urinary tract infections (1984). I. Susceptibility distribution].

Our research group was engaged for 3 years (1979-1981) in a study on sensitivities to antibiotics of 4 bacterial groups including representative pathogenic bacteria found in cases of urinary tract infections; i.e. E. coli, Klebsiella spp., Citrobacter spp., and Proteus spp. Since 1982, all the bacterial strains isolated by our group from patients with urinary tract infections and deemed by doctors in charge as pathogens were sent to the Laboratory of Clinical Pathology of Juntendo University, where they were refixed and subjected to MIC determination. This is the third year of the new study. E. coli was detected most frequently from patients with urinary tract infections and the detection frequency was 28% (323/1,153) this year (1984), whereas it was 35.3% (304/860) last year, showing a 7% decline from last year to this year. E. faecalis was next frequent organism (12.7% or 147/1,153) followed by P. aeruginosa (10.8% or 124/1,153). This order, however, was reversed from last year. Other pathogens, in a decreasing order of isolation frequencies following the above three, were as follows: Proteus spp. (9.5% or 109/1,153), S. marcescens (6.2% or 71/1,153), S. epidermidis (5.4% or 62/1,153), K. pneumoniae (4.9% or 56/1,153), Enterobacter spp. (2.4% or 28/1,153) and Citrobacter spp. (2.3% or 27/1,153). The results of the determination of the sensitivity of bacterial strains to the antibiotics are described below. Of all the oral antibacterial and antibiotic agents used against E. coli, mecillinam (MPC), cefaclor (CCL) and pipemidic acid (PPA) proved to have high antibacterial potency, and their MIC90 (the concentration to inhibit growths of 90% of the objective bacteria) was 3.13 micrograms/ml. The MIC90's of cefotiam (CTM), cefotaxime (CTX), ceftizoxime (CZX), cefmenoxime (CMX) and latamoxef (LMOX) were less than 0.39 microgram/ml. The MIC90's of cefmetazole (CMZ) and cefoperazone (CPZ) were invariably 1.56 micrograms/ml. K. pneumoniae was not sensitive to ampicillin (ABPC) and did not show much sensitivity to other oral antibacterial and antibiotic agents also. Of all the injectable preparations of antibiotics, cephem antibiotics of the third generation showed the most potent antibacterial effects against K. pneumoniae, and their MIC90's were lower than 0.10 microgram/ml for CZX, 0.20 microgram/ml for CTX, 0.39 microgram/ml for CMX, and 0.78 microgram/ml for LMOX, while MIC90's of CPZ was 6.25 micrograms/ml, which was equal to that of CMZ. The MIC90 of CTM was 0.78 microgram/ml which was identical to that of LMOX.(ABSTRACT TRUNCATED AT 400 WORDS)

Anti-Bacterial Agents↗
PubMed1986

[Comparative studies of antimicrobial agents against causative organisms isolated from urinary tract infections (1984). III. Secular changes in susceptibility].

Cases with infections of urinary tracts were divided into 3 groups of the simple infections, and complicated infections without indwelling of catheter, and complicated infections with indwelling of catheter. Susceptibilities to antimicrobial agents of Escherichia coli, Klebsiella spp., Proteus spp., Citrobacter spp., Enterobacter spp., Pseudomonas aeruginosa and Serratia marcescens which were isolated from patients with these infections were determined. There was no tendency of decline in the susceptibilities of E. coli isolated from the patients with simple urinary tract infections (UTI). Susceptibilities of E. coli isolated from the patients with complicated UTI without and with indwelling of catheter to cephem antibiotics of the third generation were examined. The susceptibility of E. coli strains isolated from patients with complicated UTI without and with indwelling of catheter remained the same. More specifically, cefmenoxime (CMX) at a concentration of less than 0.10 microgram/ml inhibited the growth of E. coli isolated from cases without: with catheter at 74.1%: 78.3% in 1982, 75.4%: 73.3% in 1983, and 81.3%: 84.8% in 1984. Also, ceftizoxime (CZX) at a concentration of less than 0.10 microgram/ml inhibited the growth at 83.3%: 95.7% in 1982, 89.2%: 86.7% in 1983, and 91.7%: 97.0% in 1984. Latamoxef (LMOX) at less than 0.10 microgram/ml inhibited the growth at 59.3%: 43.5% in 1982, 47.7%: 40.0% in 1983, and 47.9%: 42.4% in 1984. The antibacterial effect of penicillin against Klebsiella spp. was found to be poor, while those of oral cephem antibiotics, cephalexin (CEX), cefaclor (CCL), and cefazolin (CEZ) which is the cephem antibiotics of the so-called first generation and cefotiam (CTM) among other cephem antibiotics of the so-called second generation were relatively good. A study of susceptibilities of Klebsiella spp. isolated from patients with complicated UTI without and with indwelling of catheter revealed inhibition of growth by CTM at a concentration of 0.39 microgram/ml at 84.0%: 75.9% in 1982, 70.6%: 75.0% in 1983, and 95.8%: 77.8% in 1984. Cefmetazole (CMZ) at a concentration of 0.39 microgram/ml showed a relatively lower rate of growth inhibition of Klebsiella spp., while at 0.78 microgram/ml it inhibited the growth at 88.0%: 72.4% in 1982, 52.9%: 50.0% in 1983, and 70.8%: 66.7% in 1984. The antibacterial effects of both CTM and CMZ against Klebsiella spp. isolated from patients with indwelling of catheter were found to be poor, and some of the bacterial strains showed a MIC over than 100 micrograms/ml.(ABSTRACT TRUNCATED AT 400 WORDS)

Anti-Bacterial Agents↗
PubMed1986

[Comparative studies of antimicrobial agents against causative organisms isolated from urinary tract infections (1984). II. Background of patients].

Groups of bacteria were isolated from patients with infections of urinary tracts, and backgrounds of these isolates and patients have been studied in terms of the sexual distribution, and distributions of sexes versus age of the patients relationships between bacterial types and sexual and age distribution of the patients from whom the isolates were obtained correlation ages of patients and types of infections, the association of certain types of bacteria with certain infections and the effect of antibacterial treatments on these types of bacteria, approximately 20% of simple infections of urinary tracts occurred in males and approximately 80% in females on average from 1981 to 1984. This ratio showed hardly any changes during this period. Likewise, male patients comprised approximately 60-70% of all the cases with complicated infections of urinary tracts regardless of indwelling or without indwelling of catheters. In terms of age, the ratio of urinary tract infections was almost universally observed, e.g., for patients in 40's: 10.0% in 1981, 11.0% in 1984, while in those in 70's: 25.5% and 21.2%, respectively. Consequently, background factors of the cases with infections of urinary tracts, such as sexes, age, or simple or complicated, remained almost stable, whereas bacteria involved showed considerable variations. In 1982 and 1983, the frequency of isolations of Enterococcus spp. was approximately 8% in both males and females. However, in 1984, the frequency of isolation of Enterococcus spp. was 22.5% in the males 17.9% in the females. The frequency of isolation of Enterococcus spp. increased in all age groups, but the frequency was not particularly high among the aged. A study on variations and isolation frequencies of bacteria before the administration of antibiotic agents revealed that isolation frequencies of Enterococcus spp. sharply increased in 1983, and this high frequency remained in 1984. The frequency of isolation of E. coli tended to decrease year after year. This finding represents that the frequency of isolations of E. coli from materials of cases with simple infections of urinary tracts has decreased, showing that pathogenic bacteria from simple infections of urinary tracts were becoming similar to that of the complicated infections of urinary tracts. These findings seem to be worth mentioning here. In cases receiving administrations of antibacterial and antibiotic agents for more than 8 days. Frequencies of isolation from cases without catheter retention and from those with catheter retention were similar.(ABSTRACT TRUNCATED AT 400 WORDS)

Adult↗
PubMed1986

Foetal distribution of inhaled mercury vapor in normal and acatalasaemic mice.

Levels of mercury distribution in placenta, amniotic sac and foetus and those in brain and liver of maternal acatasaemic mice were higher than those of normal, respectively. The levels of mercury distribution in the blood and lungs of maternal acatalasaemic mice exposed to metallic mercury vapor were also lower than those of normal. Mercury concentrations in placenta and foetus of acatalasaemic mice following exposure to metallic mercury vapor were higher than those of normal. Maternal acatalasaemic mice had decreased levels of mercury in the blood than those of normal mice. Thus, the placenta/blood or foetus/blood ratio of mercury concentration in acatalasaemic mice was significantly higher than that in normal mice. Similarly the brain/blood or liver/blood ratio of maternal acatalasaemic mice was higher than that of normal mice. These results suggest that metallic mercury in the blood readily passed through the blood-brain, blood-foetus barriers. In contrast to the results on exposures of mice to metallic mercury, the foetus/maternal blood ratio of mercuric concentration in the acatalasaemic mice following injection of mercuric chloride was similar to that in the normal mice. Moreover, the foetus/maternal blood ratio of mercury concentration in acatalasaemic or normal mice injected with mercuric chloride was lower than those in acatalasaemic or normal mice exposed to metallic mercury.

Acatalasia↗
PubMed1986

[Factors related to the pathogenesis and clinicopathological findings in dilated cardiomyopathy].

It has been suggested that various factors related to dilated cardiomyopathy (DCM) may concern its onset and/or progression. This study was performed to clarify whether these factors contribute different clinical and morphological characteristics. Subjects were 39 patients with DCM, consisting of 28 men and 11 women whose average age was 46.5 years. The subjects were divided into five groups; namely, the Familial, Myocarditic, Alcoholic, Hypertensive, and Unknown Groups. Clinical parameters including past history, blood pressure, chest radiographs, electrocardiograms, echocardiograms and left ventricular end-diastolic pressures (LVEDP) were evaluated. Morphology of right ventricular endomyocardial biopsy specimens was evaluated in terms of hypertrophy, disarrangement, fibrosis, degeneration, endocardial thickening, interstitial changes, and types of fibrosis. The results were as follows: The Familial Group was characterized by the onset at younger age, highly elevated LVEDP, a lack of myocardial hypertrophy, and proliferation of small vessels. The Myocarditic Group was characterized by the onset at young age, elevated LVEDP, severe fibrosis showing a plexiform pattern in more than half of the patients, cellular disarrangement, and cellular infiltration. The Alcoholic Group showed possible improvement clinically and fatty infiltration in half of the patients. The Hypertensive Group was characterized by high prevalence of a previous alcohol intake, high diastolic blood pressure on admission, clinical improvement, and myocardial hypertrophy with a mild degree of perivascular fibrosis. From these findings, it is thought that each factor related to DCM offers a somewhat different clinical and histological profiles and that these factors may play an important role in the onset and/or progression of DCM. Furthermore, it is highly suggestive that specific therapy against these factors or the removal of these factors is especially necessary for favorable long-term prognosis of DCM.

Adolescent↗
PubMed1985

[Clinical study on hypotensive anesthesia with nitroglycerin].

Deliberate hypotension was induced by using nitroglycerin (NG) during anesthesia in 13 patients with intracranial aneurysm, who underwent clipping surgery. The following results were obtained: Changes in blood pressure were rapid and smooth, before, during and after administration of NG. No patients showed resistance to the drug in this study. Heart rate increased significantly during induced hypotension while a significant reduction was observed in the rate-pressure product (RPP), which correlates with the myocardial oxygen demand. No significant changes were found in pH, PaO2, PaCO2 and base excess (B. E.) while the respiratory index (PaO2/FIO2) as an indicator of pulmonary oxygenation appeared to be significantly reduced.

Adult↗
PubMed1985

Clinical evaluation of a newly introduced noninvasive cardiac flow detector (CardioFlo).

Clinical evaluation on a newly-introduced cardiac flow detector (CardioFlo) was made on 6 patients. The correlation between the values obtained from the Swan-Ganz catheter (thermodilution) and the present method was studied. A good correlation (r = 0.94) was demonstrated, which indicates clinical validity of this new method, especially when time is extremely limited as in emergency cases.

Adolescent↗