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Biomedical subjects

N Ueno

Publications and source records attributed to N Ueno.

At least 325 records · Page 18Linked to original sources
PubMed1983

Sustained release of carmustine (BCNU) for treatment of experimental intraocular malignancy.

Sustained release of carmustine (1,3-bis[2-chloroethyl]-1-nitrosourea, or BCNU) via an episcleral implanted silicone device was used to treat Greene hamster melanoma implanted in the anterior chamber of rabbit eyes. Group 1 animals received carmustine intravenously; group 2 received the drug by local sustained release via an episcleral implanted silicone device; group 3 received the drug by both local sustained release and intravenous injection (a total dosage more than twice that in group 1); and group 4 was not treated. The effectiveness of the various administration routes was compared by clinical observation of tumour size and systemic and local toxic reactions, and by histopathological examination. Carmustine delayed the growth of Greene melanoma in all 3 treated groups, but was most effective when a lower dose of the drug administered intravenously was combined with an additional higher dose administered by local sustained release. Local side effects included corneal clouding and conjunctival oedema and congestion at the early stage of local drug delivery via the episcleral implanted device.

Animals↗
PubMed1983

Urinary arylsulfatase in normal children and in patients with pediatric malignant disease.

Urinary arylsulfatase (AS) activities were measured in 20 normal children and 10 patients with malignant disease, consisting of leukemia (6), Hodgkin's disease (1), neuroblastoma (2), and malignant teratoma (1), Seven of the patients showed a significantly high activity, and a serial measurement carried out in 4 patients showed a well correlated relationship between AS activity and the activity of disease. Thus the measurement of urinary AS activity could be a laboratory test for monitoring the activity of malignant diseases because of its simple and rapid procedure.

Cerebroside-Sulfatase↗
PubMed1983

Alveolar soft-part sarcoma. A review on its histogenesis and further studies based on electron microscopy, immunohistochemistry, and biochemistry.

To date, the histogenesis of alveolar soft part sarcoma has been considered to be of paraganglioma origin, striated muscle cell origin, or as a malignant granular cell myoblastoma, neural neoplasm, or renin-producing tumor. Further studies for these existing theories were performed based on various methods. The negative formaldehyde-induced fluorescence and the immunohistochemical absence of neuron-specific enolase were against the paraganglioma theory. The immunohistochemical absence of myelin proteins (P2 protein and PO protein) and S-100 protein were against the malignant granular cell myoblastoma and neural neoplasm theory. Furthermore, there was a totally negative immunohistochemical finding for renin in the tumor cells, and the biochemical relationship of the tumor and renin was completely negated. The contradiction in a well-known report that the components of crystals were considered to be Z-band materials such as tropomyosin was referred to based on recent myological data. Concurrently, the absence of tropomyosin was immunohistochemically demonstrated. Hence, the issues on the histogenesis of alveolar soft part sarcoma and the identity of the characteristic crystalloids remain open for discussion.

Adult↗
PubMed1982

Controlled release rate of a lipophilic drug (BCNU) from a refillable silicone rubber device.

The release rates of 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU), an anticancer drug, from various kinds of silicone and silicone-nylon implantable and refillable devices were investigated in vitro. The devices were made with different surface areas and wall thicknesses. The relation of the release rate at steady state to the surface area and the relation of the release rate per unit surface area to the wall thickness were determined. The relationship among the release rate, the surface area, and the wall thickness was analyzed using the multiple regression method, and is represented on a three-dimensional graph. The multiple regression equation predicts the release rate from the surface area and the wall thickness; the release rate can also be read from a nomogram that is presented.

Carmustine↗
PubMed1982

Dynamic responses of active and inactive renin and plasma norepinephrine during exercise in normal man.

Active and inactive plasma renin, plasma angiotensin II, and plasma norepinephrine were measured during graded exercise. Five health subjects exercised on bicycle ergometer at three different loads (50, 70, and 100% of maximal oxygen uptake). Active plasma renin and plasma angiotensin II were elevated significantly during graded exercise, but plasma inactive renin decreased during the heaviest exercise; the mean ratio of active renin to total renin increased from 57 to 92% after the heaviest load. Plasma norepinephrine was also elevated during graded exercise. There is a positive correlation between plasma norepinephrine and active plasma renin during graded exercise (r = 0.916, p less than 0.01). Similar norepinephrine and active renin responses to graded exercise suggest that the mechanism(s) for activation of inactive renin and the release of active renin from the kidney may be partially related to sympathetic nervous system activity.

Adult↗
PubMed1982

Properties of renin-binding protein.

Hog renal renin-binding protein could bind homologous and non-homologous renin but could not bind human renal renin. Renin-binding protein was only detected in the kidney and pituitary in which renin is found in relatively high concentration. The renal binding protein had no interaction with renal acid proteases nor with extrarenal renins obtained from pituitary and submaxillary glands, indicating that the binding is specific for renal renin. Subcellular localization of the binding protein was studied using rat kidney by differential and density gradient centrifugation. Most renin-binding protein was recovered in the cytosol fraction and was not associated with sedimentable subcellular organelles. A renin-secreting tumor (Juxtaglomerular cell tumor) in human kidney produced not only renin but also renin-binding protein in a very large quantity.

Animals↗
PubMed1982

[Clinical effect of gamma-oryzanol on climacteric disturbance -on serum lipid peroxides (author's transl)].

Though gamma-Oryzanol has been applicated as the autonomic agent in various fields for a few decades, recently its effect on lipid metabolism comes to be much more interested. We studied on the effect of gamma-Oryzanol on climacteric disturbance, and besides on the difference of lipid peroxides level which has an important and indispensable connection with mary syndromes involving aging. We obtained the following results from 40 subjects with climacteric disturbance after administration of gamma-Oryzanol Fine Particule 1.5 g (gamma-Oryzanol 300 mg included) for 4 to 8 weeks. 1. 90% of the cases improved generally; Excellent 16 (40%), Good 14 (35%), Effective 6 (15%), No change 4 (10%). 2. Effect on climacteric disturbance was judged by the Kupperman method and the Ueda method; generally recovered 85%, 80% each. 3. Significantly reduced total cholesterol, triglyceride and increased HDL-cholesterol were noted in cases with hyperlipidemia (TC greater than or equal to 220 mg/dl, TG greater than or equal to 140 mg/dl, HDL-chol. less than or equal to 45 mg/dl). Therefore, atherogenic index was excellently recovered. 4. In cases with climacteric disturbance lipid peroxides level was high, and they were significantly recovered by administration of gamma-Oryzanol. 5. During this study, no side effects have been recognized and no particular change in function test was found. Thus, we confirmed the efficacy and utility of gamma-Oryzanol on many complaints in climacteric disturbance and also on lipid metabolism.

Adult↗
PubMed1982

Oxygen transmissibility and hydration of new and used hydrogel contact lenses.

The oxygen transmissibility and hydration of new and used CSI, Hydrocurve II, and Hydromarc hydrogel contact lenses was determined at 37 degrees C. coatings that accumulated on used lenses were observed against a bright light and were graded in four classes from mild to severe. Some coated lenses had a statistically significant increase, and some a decrease in oxygen transmissibility compared with uncoated lenses. These differences are clinically unimportant, however. Although there seems to be a trend toward increased hydration and oxygen transmissibility with increased lens coating, statistically these relationships were found not to be linear. Failure of contact lenses after long-term wear must be due to causes other than a decrease in their oxygen transmissibility.

Contact Lenses, Hydrophilic↗
PubMed1982

Pharmacokinetics of the antineoplastic agent 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) in the aqueous and vitreous of rabbit.

1,3-Bis(2-chloroethyl)-1-nitrosourea (BCNU), an anticancer drug, was assayed in the aqueous and vitreous of rabbits after intravenous injection, subconjunctival injection, and topical application. Pharmacokinetic parameters were calculated from the time-course curves. The penetration into aqueous and vitreous across the blood-aqueous barrier and the blood-retinal barrier after intravenous injection was related to the anatomic dimensions of the eye (the volume of tissue involved and the surface area through which BCNU diffuses). To evaluate the three routes of administration, the area under the time-course curve was calculated from the simulated time-course curve. The results suggest that topical application of BCNU is the best and subconjunctival injection the second best route for treating an iris tumor, and that intravenous injection is the best route for choroidal and retinal tumors.

Animals↗
PubMed1981

A 56,000-dalton renin-binding protein in hog kidney is an endogenous renin inhibitor.

Renin-binding protein (RBP) in hog kidney was characterized and identified as a renin inhibitor. The molecular weight (Mr) of rBP is 56,000 when estimated by gel filtration. Its isoelectric point is 4.9. Upon binding to renin, it forms a renin.RBP complex with Mr = 113,000 as revealed by sedimentation equilibrium using an air-driven ultracentrifuge (Airfuge). The renin.RBP complex, formed by incubating hog kidney extract at 37 degrees C, is inactive when assayed with little dilution. On extensive dilution, however, this complex dissociates and acquires renin activity. The equilibrium between renin and renin.RBP complex and the equilibration rate were also studied by high performance liquid chromatographic gel filtration. The equilibrium was shifted to the complex, suggesting that RBP is present in an excess of renin in the kidney. The complex was shown to dissociate during the gel filtration due to rapid equilibration. Therefore, the elution position of the complex varied depending on flow rates, thereby making it difficult to determine the Mr of the complex by gel filtration. The renin.RBP complex is unlikely to occur in the normal kidney because renin and RBP are localized in the granule and cytosol fractions, respectively. RBP may provide security against accidental rupture of renin granules under abnormal circumstances.

Animals↗
PubMed1981

Demonstration of the formation of renin and renin-binding protein complex using high-performance liquid chromatography.

A high-performance liquid chromatograph equipped with the newly developed gel, TSK G3000SW, was used to study the interaction between renin and renin-binding protein (RBP). Previously, the interaction could only be demonstrated after overnight gel chromatography in the presence of a non-physiological sulfhydryl reagent. However, this new high-speed gel chromatography provided a clear separation of renin and renin--RBP complex within 40 min. It also demonstrated that the renin--RBP complex was formed at 37 degrees C in the absence of sulfhydryl reagent. Theses results indicate that the binding protein may play an important role in blood pressure regulation.

Animals↗