Biomedical subjects

H Hata

Publications and source records attributed to H Hata.

At least 181 records · Page 10Linked to original sources

PubMed1990

Cavernous angioma with encapsulated intracerebral hematoma: report of two cases.

Two cases of a cavernous angioma with an encapsulated intracerebral hematoma are presented. In both instances, computed tomography scan showed a ringlike appearance with a nodular lesion. Cerebral angiograms of the two cases, however, were normal. The preoperative diagnosis for both cases was a brain neoplasm. The diagnostic problems that this type of vascular malformation presents and its role in the development of the encapsulated hematoma are discussed.

Adult↗

PubMed1990

No change in serum dopamine-beta-hydroxylase activity in workers exposed to trichloroethylene.

To determine whether occupational exposure to trichloroethylene (TCE) influences sympathetic nerve activity, serum dopamine-beta-hydroxylase (DBH) activities were analyzed in 84 male workers exposed to TCE and 83 male age-matched controls. The workers were exposed to about 22 ppm TCE in air. There were no significant differences between the mean serum DBH activity levels for the exposed workers and the corresponding controls. No significant correlation was found between the serum DBH activities and the urinary TCE-metabolite levels or the duration of employment of the workers. The results suggest that chronic occupational exposure to TCE did not influence sympathetic nerve activity of the workers.

Adolescent↗

PubMed1990

Establishment and characterization of acute B-cell lymphocytic leukemia cell line showing (8;14) and (14;18) chromosome translocation.

Cell line KHM-2B expressing two oncogene products, c-myc and bcl-2, was established from a patient with acute lymphocytic leukemia with an 8;14 and 14;18 chromosome translocation. Surface marker studies of the cell line showed that the cells were positive for HLA-DR, CALLA (CD10), B1 (CD20) and B4 (CD19), but negative for T11 (CD2). The fresh cells from peripheral blood of the patient had no surface immunoglobulins, whereas KHM-2B cells were positive for mu.lambda type surface immunoglobulin. A cytogenetic analysis of the cell line revealed two translocations, t (8;14) (q24;q32) and t(14;18)(q32;q21). Rearrangement of the c-myc and bcl-2 genes was detected by Southern blot analysis of the KHM-2B DNA. Northern blot analysis revealed production of c-myc and bcl-2 mRNAs. These results indicated that two oncogenes were activated by two translocations to immunoglobulin genes.

Antigens, Surface↗

PubMed1990

Autocrine growth by two cytokines, interleukin-6 and tumor necrosis factor alpha, in the myeloma cell line KHM-1A.

The effects of tumor necrosis factor alpha (TNF-alpha) and interleukin-6 (IL-6) on the cell growth of the myeloma cell line KHM-1A were studied. TNF-alpha strongly induced KHM-1A proliferation, while IL-6 weakly enhanced growth only at low cell densities. When TNF-alpha was combined with IL-6, TNF-alpha-induced growth enhancement was reduced. According to Northern blotting analysis, the m-RNA of both TNF-alpha and IL-6 were detected in KHM-1A. Moreover, monoclonal antibody capable of neutralizing the cytotoxic activity of TNF-alpha inhibited the proliferation of this cell line. These findings suggest that this cell line operates under an autocrine growth mechanism with respect to these two cytokines, IL-6 and TNF-alpha.

Antibodies, Monoclonal↗

PubMed1990

Genetic analysis of amylase-producing cell lines: ectopic activation of the amylase gene by translocation.

Two amylase-producing cell lines have been established, KMK-2 from a patient with gastric cancer, and KHM-1B from a patient with IgA lambda-type multiple myeloma. Both patients exhibited extremely high levels of serum amylase. The production of S-type amylase m-RNA by KMK-2 and KHM-1B was demonstrated by Northern blot analysis. Chromosome analysis showed many qualitative and quantitative abnormalities in both cell lines. In KHM-1B, a translocation was found between 1p13 or 21, near the amylase genes locus, and 9q34, the abl oncogene locus. These findings suggest the amylase gene in KHM-1B to be activated by translocation. A rearranged amylase gene was demonstrated by Southern blot analysis with only one enzyme, Accl.

Amylases↗

PubMed1990

[Evaluation of preventive dental care for first permanent molars in children].

The prevalence of dental caries in first permanent molars was measured in 220 children who have been under regular dental care at the Pediatric Dental Clinic, Tohoku University School of Dentistry. While the caries prevalence rate of first permanent molars reached approx. 50% five years after the eruption, the number of filled surfaces per restored tooth was less than 2.0. The caries prevalence of the permanent mandibular first molars was significantly higher than the caries prevalence of the permanent maxillary first molars. However, the occlusal surface showed no significant differences between the maxillary and mandibular molars. While comparing the female to male group, the caries prevalence rate was significantly higher and the peak of caries occurrence on every surface was earlier in the females. Pit and fissure sealants were applied to approx. 75% of first permanent molars and the occlusal caries were reduced as a result of sealing. When sealants were applied to the teeth diagnosed as C1, 50% were restored due to development of caries. This was a significantly higher rate than that applied to sound teeth. Our study indicates that most of the occlusal caries occurred in the earlier stage of 1-2 years after the eruption, before sealants were applied. The buccal fissure of the lower molars and the occlusal fissures both showed high caries prevalence. It was suggested that prevention of fissure caries immediately following eruption until the sealant is applied is an important issue in our present dental care system.

Child↗

PubMed1990

Effects of 3-deoxyglucosone on the Maillard reaction.

We investigated the effect of exogenously applied 3-deoxyglucosone, a major carbonyl intermediate, on the Maillard reaction. The fluorescence intensity of the product of the reaction of bovine serum albumin with 3-deoxyglucosone was higher than that with an equivalent amount of glucose. Similarly the rate of polymerization of lysozyme in the presence of 3-deoxyglucosone was also greater than with glucose, and collagen incubated with 3-deoxyglucosone was less digestible than collagen incubated with glucose. By contrast, aminoguanidine inhibited an increase in fluorescence of the Maillard compounds and the polymerization of protein, both of which were stimulated by 3-deoxyglucosone. These results suggest that 3-deoxyglucosone accelerates the advanced stage of the Maillard reaction and that aminoguanidine acts on 3-deoxyglucosone to inhibit its action in the advanced stage of the Maillard reaction.

Collagen↗

PubMed1990

[A case of recanalization of LV-RA communication associated with tricuspid regurgitation complicating active endocarditis in chronic renal failure].

Open heart surgery (patch closure of the defect and tricuspid valvuloplasty with DeVega's annuloplasty) has been successfully performed on 35-year-old woman who has had a history of VSD closure and was undergoing hemodialysis. The patient has also been under treatment for active endocarditis due to streptococcal infection. Hemofiltration method was used during cardiopulmonary bypass. We describe our experience and discuss the management of the problems in this case.

Adult↗

PubMed1990

[Clinical significance of CA19-9 for endometriosis].

We investigated the usefulness of measuring the serum CA19-9 concentration in the diagnosis and therapeutic monitoring of endometriosis, and compared it with the serum CA125 concentration. We added an immunohistochemical study on CA19-9 and CA125 to find their localization in the various lesions of endometriosis. 1. The positive rate of serum CA19-9 in patients with endometriosis is 52.0% and that of CA125 is 48.0%. When both markers are examined, their positive rate increases to 71.4%. 2. As the Beecham classification stage advanced, the serum CA19-9 positive rate tended to increase. 3. The patients with endometriosis were followed up after surgery or during Danazol therapy. CA19-9 correlated closely with the clinical course. 4. The immunohistochemistry of CA19-9 shows that it localizes in chocolate cysts, but not in the lesions of adenomyosis. CA125 is seen in both lesions. The localizing of CA19-9 is thus seen to be different from that of CA125. It is concluded that the measurement of the serum CA19-9 concentration combined with that of CA125 is useful in the diagnosis and therapeutic monitoring of endometriosis.

Antigens, Tumor-Associated, Carbohydrate↗

PubMed1990

[Effectiveness and limitations of IABP or LVAD in right ventricular dysfunction].

IABP and well functioning left ventricular assist device for a failing left ventricle have potential for altering the loading condition of the right heart. Depending on the extent of myocardial damage and the pulmonary vascular resistance, IABP and LVAD can have different degree of hemodynamic effect on the right ventricle. We examined 20 clinical cases who required IABP support to wean from cardiopulmonary bypass. In 10 cases (group I), CVP rose up above 20 cmH2O within 12 hrs of post operative period. In another 10 cases (group II), CVP rose less than 20 cm H2O. Then we compared hemodynamic change (m-PAP, PVR, CVP, PAWP, CI and RVSWI) between two groups until 72 hrs of post operative period. No significant differences were noted in PVR and CI between two groups, but CVP, m-PAP, PAWP and RVSWI were markedly higher in I group. Reduction of RV afterload produced with an IABP may probably be due to degree of recovery of failing left ventricular function. It is though that IABP has less favorable effect on right ventricular in the cases whose CVP elevate above 20 mmH2O within 12 hrs after operation than in those with CVP below 20 cmH2O. Clinical studies were made on 4 cases with biventricular failure in our experiences of 8 LVAD cases (LV aneurysmectomy + VSP closure, MVR + AVR + CABG + LV aneurysmectomy, CABG + LV aneurysmectomy and MVR + CABG). LVAD seems to have more beneficial effect on RV afterload, than IABP right ventricular dysfunction, however, is likely to continue in the cases whose CVP elevates above 30 mmH2O even if LVAD is used.

Adult↗

PubMed1989

Proliferation and responsiveness to estrogen of human endometrial cancer cells under serum-free culture conditions.

Studies of hormonal growth regulation in cultured human endometrial cancer cells are limited by the requirement of exogenous growth factors, usually supplied by addition of serum. The present report provides evidence that estradiol can stimulate proliferation of endometrial cancer cells of the Ishikawa line in the absence of serum or added growth factors. Mitogenic effects of estrogen were demonstrated in two different experimental systems, in cells attached to the substratum of mammalian tissue culture dishes, and in cells forming colonies in soft agar under anchorage-independent conditions. Addition of estradiol to a mixture of serum-free, phenol red-free Dulbecco's minimal essential medium and Ham's F-12 medium, supplemented with L-glutamine and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid [basal medium: (BM)] significantly increased the proliferation of cells attached to culture dishes. Dose-response experiments revealed maximal estradiol stimulation at 10 nM; significant responses were also observed at 1 nM and at 100 nM concentrations. The mitogenic effect of 10 nM estradiol was comparable to that of 1% charcoal-treated fetal bovine serum and the two effects were additive. The presence of estradiol in serum-free BM resulted in a shortening of the doubling time of exponentially proliferating cells from 38 to 29 h. From the labeling index, measured after exposure to a pulse of [3H]thymidine, and from the mitotic index, both determined in exponentially proliferating cells, the lengths of the S and M phases were calculated to be 11 and 1 h, respectively. From these data it was estimated that estradiol shortened the G1 phase by approximately 40%, from 22 to 13 h. Estradiol doubled the colony formation efficiency of cells plated in BM containing 0.3% agar in the absence of serum as well as in the presence of 1% charcoal-treated fetal bovine serum. The stimulation of colony formation by estradiol was influenced by medium components, since no effects were observed in minimal essential medium. The colony formation efficiency was positively related to the serum concentrations and remained significantly lower in minimal essential medium than in BM at comparable serum levels. The observed positive relationship between colony formation efficiency and cell densities at plating suggests a cooperative mitogenic effect, likely due to autocrine and paracrine action of secreted growth factors. These results define a model to evaluate hormonal growth regulation mediated by autocrine mitogens in human endometrial cancer cells in the absence of interfering exogenous growth factors.(ABSTRACT TRUNCATED AT 400 WORDS)

Cell Aggregation↗

PubMed1989

Profiles of expression of activated cell antigens on peripheral blood and lymph node cells from different clinical stages of adult T-cell leukemia.

The expression of activated cell antigens (Ags) on adult T cell leukemia (ATL) cells at different clinical stages (acute, chronic, and smoldering), and ATL cells from enlarged lymph nodes were studied using monoclonal antibodies (MoAbs). The expressions of CD25 (Tac), CD28, T9 (transferrin receptor), and Ki-67 (proliferating cell nuclear antigen) Ags were high, and that of CD7 Ag was low in both acute and chronic ATL cells compared with that in normal T cells. The expressions of T9 and Ki-67 Ags were higher in acute ATL cells than in chronic ATL cells. The expression of CD38 Ag was higher in acute ATL cells but not in chronic ATL cells compared with normal T cells. On the contrary, the expression of HLA-DR Ag on the cell surface and the transcript of the HLA-DR Ag gene were high in chronic ATL cells, but not in acute ATL cells. A high percentage of lymph node ATL cells expressed T9, CD38, and Ki-67 Ags, although the peripheral blood ATL cells of the same patients showed significantly lower levels of expression of the same Ags. Interestingly, CD7 and HLA-DR Ags were detected on the majority of lymph node ATL cells. Moderately high percentage of smoldering ATL cells expressed CD25, CD28, and HLA-DR Ags, though a few numbers of leukemic cells were present in the samples. These findings confirm that the modes of activation of ATL cells in different clinical stages differ, and suggest that the differences might be reflected in the clinical features. The low expression of HLA-DR Ag in acute ATL cells, despite high expression of the Ag in chronic ATL cells, suggests that successive events that suppress HLA-DR Ag expression are necessary for the transformation of chronic ATL cells into acute ATL cells. Moreover, the high expressions of T9, CD38, Ki-67, CD7, and HLA-DR Ags on lymph node ATL cells indicate that ATL cells preferentially proliferate in lymph nodes.

Antibodies, Monoclonal↗

PubMed1989

Ketopantoyl-lactone reductase from Candida parapsilosis: purification and characterization as a conjugated polyketone reductase.

Ketopantoyl-lactone reductase (2-dehydropantoyl-lactone reductase, EC 1.1.1.168) was purified and crystallized from cells of Candida parapsilosis IFO 0708. The enzyme was found to be homogeneous on ultracentrifugation, high-performance gel-permeation liquid chromatography and SDS-polyacrylamide gel electrophoresis. The relative molecular mass of the native and SDS-treated enzyme is approximately 40,000. The isoelectric point of the enzyme is 6.3. The enzyme was found to catalyze specifically the reduction of a variety of natural and unnatural polyketones and quinones other than ketopantoyl lactone in the presence of NADPH. Isatin and 5-methylisatin are rapidly reduced by the enzyme, the Km and Vmax values for isatin being 14 microM and 306 mumol/min per mg protein, respectively. Ketopantoyl lactone is also a good substrate (Km = 333 microM and Vmax = 481 mumol/min per mg protein). Reverse reaction was not detected with pantoyl lactone and NADP+. The enzyme is inhibited by quercetin, several polyketones and SH-reagents. 3,4-Dihydroxy-3-cyclobutene-1,2-dione, cyclohexenediol-1,2,3,4-tetraone and parabanic acid are uncompetitive inhibitors for the enzyme, the Ki values being 1.4, 0.2 and 3140 microM, respectively, with isatin as substrate. Comparison of the enzyme with the conjugated polyketone reductase of Mucor ambiguus (S. Shimizu, H. Hattori, H. Hata and H. Yamada (1988) Eur. J. Biochem. 174, 37-44) and ketopantoyl-lactone reductase of Saccharomyces cerevisiae suggested that ketopantoyl-lactone reductase is a kind of conjugated polyketone reductase.

Alcohol Oxidoreductases↗

PubMed1989

Amylase-producing multiple myeloma. Cytochemical, immunohistochemical and immunoelectron microscopic studies.

The first autopsy case of amylase-producing IgA-lambda-type multiple myeloma is described. Immunohistochemically, amylase and alpha and lambda chains of immunoglobulin were demonstrated in the cytoplasm of the myeloma cells. Secretion of amylase by cultured myeloma cells obtained from the patient's pleural effusion was clearly demonstrated by the starch film method. Immunoelectron microscopically, positive reaction products for amylase and the alpha chain of immunoglobulin were observed in the well developed endoplasmic reticulum. Since no secretory granules were observed, we postulated that the secretory process of amylase was not via the zymogen granules but via a mechanism similar to that for immunoglobulin.

Amylases↗

PubMed1989

Induction of resistance in Oncomelania hupensis nosophora against Schistosoma japonicum, but not against Paragonimus ohirai, using irradiated miracidia.

Oncomelania hupensis nosophora snails sensitized with X-irradiated Schistosoma japonicum miracidia demonstrated resistance against a following challenge infection with non-irradiated homologous miracidia. The resistance in O. h. nosophora against S. japonicum was acquired within 1 day of sensitization, and it was strongest in a group challenged at an interval of 3 days. The resistance persisted for at least 4 weeks. Histological examinations revealed amoebocyte accumulation around the challenged S. japonicum sporocysts. On the other hand, when O. h. nosophora sensitized by exposure to X-irradiated P. ohirai or S. japonicum miracidia were subsequently challenged with normal P. ohirai miracidia, no resistance was observed, although they expressed the resistance against heterologous S. japonicum infection.

Animals↗

PubMed1989

Sister-chromatid exchanges in lymphocytes of workers exposed to trichloroethylene.

To detect mutagenic effects of trichloroethylene (TCE) on humans, sister-chromatid exchanges (SCEs) were analyzed in lymphocytes of 22 workers occupationally exposed to TCE and 22 matched controls. Although urinalysis in the workers revealed their obvious exposure to TCE, no increase in SCE frequencies was found in lymphocytes of the workers. SCE analysis in lymphocytes could not detect mutagenic effects by occupational exposure to TCE on humans.

Adult↗

PubMed1989

Urinary total protein and beta-2-microglobulin in workers exposed to trichloroethylene.

Chlorinated solvents are thought to be more nephrotoxic than nonchlorinated solvents in humans. Many workers have been exposed to trichloroethylene (TCE) because TCE is one of the most useful chlorinated solvents in some industries. Thus, to detect adverse effects of human exposure to TCE on kidneys, urinary total protein (U-TP) and beta-2-microglobulin (U-B2M) were determined in 104 male workers occupationally exposed to TCE and 102 male nonexposed controls. The workers have been probably exposed to 15 ppm TCE in air. The U-TP level of the workers, rather than the U-B2M level, was slightly higher than those of the controls. The differences of the U-TP level or the U-B2M level between the two groups, however, were not significant excluding an exception. (The mean U-TP level for 35- to 44-year-old workers was significantly higher than that for corresponding controls.) These results suggest that adverse effects of occupational exposure to TCE on kidney is very mild and glomerular rather than tubular.

Adult↗

PubMed1989

An autopsy case of interlobar arterial dissection of the kidney following long-term hemodialysis.

An autopsy case of massive renal hemorrhage in a 49-year-old male who had undergone maintenance hemodialysis for 8 years, is reported. No bleeding tendency had been noticed, and blood pressure had been reduced to within the normal range. Histological investigation with semiserial sections revealed that hemorrhage had occurred in four arteries, corresponding to the interlobar, arcuate, and interlobular levels, which existed in the same ruptured cyst wall. Acute dissection had occurred in two of the four arteries, leading to rupture of the cyst; this led to destruction of the remaining arteries. Both kidneys, which were markedly shrunken and had numerous cysts in the cortex and medulla, fell into the category of acquired cystic renal disease of long-term hemodialysis. It was suspected that renal vascular change during hemodialysis, mechanical factors compressing the protruding artery in the cyst with scanty renal interstitium, and relatively radical hemodynamic changes during dialysis had contributed to the hemorrhage.

Aneurysm↗