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Biomedical subjects

S Iizuka

Publications and source records attributed to S Iizuka.

At least 73 records · Page 4Linked to original sources

A study of zinc distribution in erythrocytes of normal humans.

The assignment of zinc bound to carbonic anhydrase isoenzymes (CA-I and CA-II) and Cu2 Zn2 superoxide dismutase (SOD1) was investigated in the hemolysates from 21 normal male subjects. Sufficient care was taken to remove leukocytes and platelets. The following values of zinc distribution were obtained: total zinc, 113.8 +/- 22.7 (mean +/- S.E.) micrograms X 100 ml-1; CA-I-derived zinc, 866.6 +/- 26.2 micrograms X 100 ml-1; CA-II-derived zinc, 99.9 +/- 3.9 micrograms X 100 m-1; SOD1-derived zinc, 60.3 +/- 1.9 micrograms X 100 ml-1; the other zinc, 87.0 +/- 12.6 micrograms X 100 ml-1. Namely, 7.6% of the zinc in human erythrocytes is not bound to the carbonic anhydrases and Cu2Zn2 superoxide dismutase, but present in available form or attached to other enzymes.

Adult↗

Morphology of the cataract in albino mutant quails (Coturnix coturnix japonica).

Morphological changes in cataractous albino quail lens were studied by light microscopy. In some animals, a pin-head opacity in the lens could first be detected with the naked eye 2 months after hatching. Faint anterior or posterior cortical opacity was observed in many lenses at 3 months of age. Most lenses had turned opaque 12 months after hatching. Lens dimensions were markedly enlarged at 6 months of age. Vacuoles were present in the posterior surface just beneath the capsule and equatorial epithelium, before the cells became degenerative. Many swollen lens fibers and abnormally migrated cells were observed in the posterior cortical region. The lens was covered with several layers of epithelioid cells in the mature cataract.

Aging↗

A monoclonal antibody against gamma-glutamyltransferase from human primary hepatoma: its use in enzyme-linked immunosorbent assay of sera of cancer patients.

A monoclonal antibody, gamma-120, was raised against a highly purified gamma-glutamyltransferase (gamma GT) from human primary hepatoma. The antibody preferentially bound to the small subunit of gamma GT from human hepatoma and kidney as evidenced by immunoblot analysis. Weak binding to the normal liver enzyme could be detected by solid-phase enzyme-linked immunosorbent assay (ELISA). With the use of this antibody, an ELISA was developed for the quantitation of immunoreactive gamma GT in human serum. Sera of 188 normal control subjects displayed a low level (9.4 micrograms/ml) of immunoreactive gamma GT. Highly elevated levels of immunoreactive gamma GT were detected in the sera of patients with primary hepatoma, metastatic liver cancer, pancreatic cancer, and certain types of lung cancer. Slightly elevated levels of immunoreactive gamma GT were seen in the sera of patients with liver cirrhosis. The levels of gamma GT were within a normal range in the sera of patients with gastrointestinal cancers and patients with nonmalignant diseases such as hepatitis and gallstones. The antibody has been shown to be useful for the diagnosis of some of the neoplastic diseases.

Antibodies, Monoclonal↗

Measurement of human serum immunoreactive gamma-glutamyl transpeptidase in patients with malignant tumors using enzyme-linked immunosorbent assay.

An enzyme-linked immunosorbent assay for human immunoreactive gamma-glutamyl transpeptidase (gamma-GTP) was developed. This assay was found to be simple, reproducible, and sensitive to 10 ng of the enzyme. Serum immunoreactive gamma-GTP content was significantly elevated in patients with various malignant tumors including liver cell cancer, lung cancer, gastric cancer, esophageal cancer, and colorectal cancer. On the other hand, in sera of patients with nonneoplastic diseases, the immunoreactive gamma-GTP content was not significantly elevated. No correlation was found between the serum levels of gamma-GTP determined by enzymatic assay and enzyme-linked immunosorbent assay, which indicates that, due to the presence of endogenous inhibitors and/or activators in sera, the enzyme activity may not reflect the true amount of enzyme protein. The measurement of immunoreactive gamma-GTP protein in sera appears to be useful for the detection and monitoring of certain malignant tumors.

Cross Reactions↗

[A survey on the current status and trends in bladder irrigation].

Questionnaires were sent to pharmacies and clinics in 592 Japanese hospitals from July to November, 1983 to investigate the use of bladder irrigation. The questionnaires were completed and returned by 418 hospitals, the rate of response being 70.8%. Fifty eight kinds of irrigants were prepared in hospital pharmacies and were reported to have been used in 1,171 patients. Of these irrigants, chlorhexidine gluconate accounted for 18.8%, Polymyxin B for 17.1%, normal saline for 13.3%, potassium permanganate for 6.9%, and boric acid for 5.7%. Chlorhexidine gluconate was usually used at a concentration of 0.02% (in 79% of the total use of the agent), Polymyxin B at 0.01%, 0.02% and 0.05%, potassium permanganate at 0.01% and 0.02% (in 73% of the total use), and acrinol at 0.01%, 0.05% and 0.1%. To questions about side effects, such as irritation, 65 hospitals answered that irritation had occurred. Irrigants were most frequently supplied to non-disposable 500 ml containers used exclusively for this purpose, 38% of all the hospitals using this method. Non-disposable 1 liter containers for exclusive use with bladder irrigants were used in 23% of the hospitals. Purified water was most frequently used to prepare the bladder irrigants (in 35% of hospitals) followed in descending order, by sterile purified water in 33%, and distilled water for injection in 26%. Water for irrigants was prepared at the hospital in 83% of the hospitals. The time of storage of the prepared bladder irrigants was mostly one week to one month, and was within one month in 78% of the hospitals. Seventeen percent of the hospitals answered that the preparation of bladder irrigants was a cause of overwork in their pharmacies. Irrigants against Pseudomonas infections were prepared separately in 40% of the hospitals, and there was no such regulation in 37%. Forty four agents were used to prepare such irrigants, and Polymyxin B accounted for 50%. The use of these agents significantly (P less than 0.001) differed between hospitals. Forty eight percent of the hospitals made special preparations for patients with clouded urine, and there was no such regulation in 46%. Thirty nine agents were used for this purpose. Polymyxin B was used in 30%, and chlorhexidine gluconate in 19%. The use of these agents differed significantly (P less than 0.001) between hospitals.(ABSTRACT TRUNCATED AT 400 WORDS)

Disinfection↗

Electrical characteristics of the isolated dog ciliary body.

Transepithelial potential difference and short-circuit current of the dog ciliary body were measured in vitro in an Ussing-type chamber using HEPES-buffered solution containing bicarbonate. Their values were -1.35 +/- 0.08 mV (mean +/- S.E.M., n = 52) and -23.6 +/- 1.7 microA/cm2, respectively. At 10(-4) M, ouabain reduced the short-circuit current upon to either side of the chamber. On the other hand, at 10(-5) M of furosemide to the aqueous side, the short-circuit current was reduced. However even at 10(-3) M, this drug had no effect when applied to the stromal side. Behavior of the dog ciliary body towards these two inhibitors was compared with that of the toad and rabbit tissues.

Animals↗

[Human manganese-containing superoxide dismutase: enzyme immunoassay and contents in lung cancer].

A manganese-containing superoxide dismutase (Mn-SOD) was isolated from human liver mitochondria by the procedures including heat treatment, ammonium sulfate precipitation, ion exchange chromatography, gel filtration and isoelectric focusing. Sodium dodecyl sulfate polyacrylamide gel electrophoresis of the purified enzyme showed a single band with an approximate molecular weight of 20,000. Judging from the molecular weight of an approximate 80,000 estimated by gel filtration and the above electrophoretic result, the native Mn-SOD exists as a tetramar. Ouchterlony test using a monospecific goat antiserum against the purified liver Mn-SOD indicated that the enzymes from normal lung as well as lung cancer were immunochemically identical. A solid phase enzyme immunoassay (EIA) was established to detect this Mn-SOD enzyme protein in the tissue homogenates. The working range by this assay was from 10 ng to 1,000 ng. The enzymatic activities and the immunological contents of the Mn-SOD in human lung carcinoma and uninvolved lung were compared. The enzyme contents determined by EIA were significantly elevated in carcinoma tissues as compared to the normal uninvolved tissues (37.4 micrograms/mg protein and 17.9 micrograms/mg protein, respectively). However no significant difference was seen in the enzyme activities. Among histological types of lung carcinoma, adenocarcinoma had a significantly high Mn-SOD content. These results suggest that the carcinoma tissues contain an immunologically active, but enzymatically inactive form of Mn-SOD enzyme.

Humans↗

Measurement of retinal permeability to sodium fluorescein in vitro.

Fluorescein permeabilities of isolated dog retinal pigment epithelium (RPE)-choroid and sensory retina were measured individually. Retina to choroid (outward) permeability of sodium fluorescein was significantly larger than choroid to retina (inward) permeability at RPE-choroid under both open- and short-circuit conditions. Outward permeability was decreased by the addition of 10(-3) M KCN and of 10(-4) M probeneside but was not affected by 10(-6) M ouabain. These drugs decreased transepithelial potential and short-circuit current. No directional difference of fluorescein permeability for sensory retina was found. Active transport of fluorescein across RPE from retina to choroid is suggested. Fluorescein permeability of sensory retina was larger than inward but less than outward permeability of RPE-choroid. The result indicates that the sensory retina acts as a diffusion barrier for sodium fluorescein.

Animals↗

Enzyme-linked immunosorbent assay for human manganese-containing superoxide dismutase and its content in lung cancer.

A manganese-containing superoxide dismutase (Mn-SOD) was purified from human liver. Polyclonal antibody for the Mn-SOD was prepared in goat, and a simple and specific enzyme-linked immunosorbent assay (ELISA) for the Mn-SOD was developed. This assay was found to be sensitive to nanogram amounts of the enzyme. With respect to Mn-SOD levels of normal lung tissues, a positive correlation (r = 0.92, P less than .001) was observed between the results of enzymatic assay and those of immunochemical assay by ELISA. In lung carcinoma tissue the enzyme activity was in the same order of magnitude as in uninvolved tissues. However, the enzyme content determined by ELISA was significantly higher in adenocarcinoma than in the uninvolved lung tissue, whereas no significant difference from the control was observed in other histologic types. The discrepancy between the enzyme activity and immunoreactive content suggested that in the adenocarcinoma of the lung an immunoreactive but enzymatically inactive Mn-SOD protein existed and that a high content of this enzyme was characteristic of lung adenocarcinoma.

Enzyme-Linked Immunosorbent Assay↗

gamma-Glutamyl transpeptidase of rat liver and hepatoma tissues: an enzyme immunoassay and immunostaining studies.

A sensitive enzyme immunoassay method for rat gamma-glutamyl transpeptidase was developed that was able to quantitate between 5 to 500 ng of the enzyme. The enzyme contents of fetal liver, adult liver, hyperplastic nodules, and various tissues including hepatoma were determined. Normal rat liver contained very little enzyme, while fetal liver and hepatoma tissue contained high levels. The gamma-glutamyl transpeptidase content of the liver was assayed during the process of 3'-methyl 4-dimethyl-aminoazobenzene-induced hepatocarcinogenesis. The content was increased at an early stage, then decreased, and again increased at the stage when hepatoma developed. The change of the enzyme content determined by an enzyme immunoassay was highly consistent with that determined by enzymatic assay. This indicates that the increased activity of the enzyme as previously reported was accompanied by an increased immunoreactive enzyme protein. Immunohistochemical studies on the hyperplastic nodule revealed the presence of gamma-glutamyl transpeptidase in the hepatocyte membrane.

Animals↗

[Statistical analysis of urinary estriol (U-E3), serum leucine aminopeptidase (LAP) and heat stable alkaline phosphatase (HSAP) in toxemia].

The levels of urinary estriol (U-E3), serum leucine aminopeptidase (LSP) and heat stable alkaline phosphatase (HSAP) were determined in toxemic and normal pregnancies. The significance of differences was established by weekly estimation of the parameters for both groups after the 28th week of gestation. Assayed values were classified into 4 types (type I-IV) by the mean values for 3 serial 24h assays and 3 patterns (pattern a-c) observed with these three determinations. The distribution rate for each type and pattern was examined according to the following: Severe toxemia, low birth weight, meconium staining at parturition and low apgar score groups. For U-E3, the incidence of the low value type (type IV) and the descending pattern (pattern c) both increased linearly in all the above groups. These findings suggest the clinical applicability of U-E3 as a reasonable indicator for evaluating intrauterine fetal well being because of the close correlation to the listed conditions. Thus these biochemical parameters should be considered in the antepartum fetal management of third trimester toxemic pregnancies.

Alkaline Phosphatase↗

Chromosome abnormalities involving 11p13 and low erythrocyte catalase activity.

Two unrelated patients with clinical features of 11p13 deletion syndrome, 3 years old and 3 months old, are reported. The clinical features of the patients included mental retardation, aniridia, nystagmus, blepharophimosis, and genitourinary abnormalities. Both patients were apparently free from Wilms' tumor and gonadoblastoma. Prometaphase banding analyses revealed a 46,XY,del(11)(p1300p1500) karyotype in one patient and 46,XX,dir ins(11;2)(p13;q12q23) in the other. Catalase activities in the erythrocytes in the two patients were respectively 65% and 56% of those of normal controls, close to the expected values in hemizygosity of the catalase gene. These findings confirmed a close linkage of the gene for catalase and those for the aniridia--Wilm's tumor or gonadoblastoma complex.

Catalase↗

The abortifacient effect of 16,16-dimethyl-trans-delta 2-PGE1 methyl ester, a new prostaglandin analogue, on mid-trimester pregnancies and long-term follow-up observations.

The present clinical trials revealed that 16,16-Dimethyl-trans-delta 2-PGE1 methyl ester in the form of vaginal suppositories is highly effective in inducing mid-trimester termination of pregnancies. It also showed that prior treatment with laminaria and metreurynter may enhance the success rate while reducing the incidence and severity of side effects. It is easy and safe to use clinically, with minimal side effects, and in our series, revealed no deleterious effects on ensuing reproductive physiology. However, the definite mechanism involved in the action of this new analogue to cause myometrial contractions is still not completely understood, and requires further intensive investigation.

Abortion, Induced↗

Effect of anaerobic conditions in bottom waters on the occurrence of red tides at omura bay.

The field observation that the occurrence of red tides at Omura Bay may have a close connection with the development of anoxic conditions in bottom waters was tested by bioassays of seawater collected during summer 1971. The stimulating effect of anaerobically-decomposed products of bottom mud on the growth of Gymnodinium type-'65 was examined. The results suggest that the development of oxygen deficiency in the bottom waters of Omura Bay makes the environment favourable for the growth of red tide organisms, both by the supply of inorganic nutrients and of some unidentified stimulants.

Anaerobiosis↗