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Biomedical subjects

M Nakano

Publications and source records attributed to M Nakano.

At least 955 records · Page 53Linked to original sources
PubMed1988

[Intravesical ectopic recurrence of bladder tumors].

Conservative therapy, preserving bladder function, is most commonly done for the treatment of bladder tumors. However, prevention of intravesical ectopic recurrence remains to be the major postoperative problem. Between April, 1969 and March, 1986. 144 patients were treated conservatively at our Hospital. Initial recurrence occurred in 36.8% of the conservatively treated cases. Second recurrence occurred in 73.2% twice the rate of initial recurrence. No differences were noted between the recurrence rate of single and multiple tumors. Overall recurrence rate according to histological grade was 0% for Grade 0, 36.4% for Grade 1, 36.8% for Grade 2, and 50.0% for Grade 3. The overall recurrence rate of the group without postoperative prophylactic adjuvant therapy was 37.0%. The overall recurrence rate according to postoperative prophylactic adjuvant therapy was 28.6% for intravesical Mitomycin C (MMC) instillation, 30.0% for intravesical Adriamycin (ADM) instillation, 36.8% for external irradiation, 42.9% for fluorouracil (5FU) administration and 100% for 5FU + intravesical instillation. As a whole 5FU is not effective. However, in 1 patient who had had seven previous recurrences, no recurrence has occurred for over seven years after 5FU administration. Effect of adjuvant therapy differs in each case and cannot be regarded in the same light. High grade, high stage, and large (greater than 3 cm) tumors show a high recurrence rate. Progression (grade up, stage up) occurred in 11.3% of the recurrence cases.

Administration, Intravesical↗
PubMed1988

[Intravesical bacillus Calmette-Guerin in the treatment of recurrent superficial bladder tumors].

Seven patients with recurrent superficial bladder tumors were treated by vesical and intradermal administration of BCG. All of these patients have had recurrence more than 2 times. BCG instillation was performed every weeks for 6 weeks after transurethral resection of bladder tumor. A suspension containing 120 mg BCG in 40 ml normal saline was instilled intravesically. BCG was administered into alternate upper thighs using a multiple puncture apparatus. Statistical analysis of bladder tumor in our hospital revealed the second recurrence rate to be 73.2%. The reduction of tumor recurrence rate of BCG treated patients was 43.0%. The reduction of tumor recurrence by BCG treatment was statistically significant, compared to other treatments. It seemed that patients with severe side effects such as bladder tenesmus and urinary infection, have a long tumor-free period. Therefore, we suggest that the reactive inflammation in bladder during BCG treatment plays an important role.

Administration, Intravesical↗
PubMed1988

[Metastatic calcification associated with malignancy].

From 1975 to 1986, 15 cases (2%) of metastatic calcification associated with an underlying malignancy were found in a review of 702 autopsied cases with histories of malignancy. These underlying malignancies included 7 cases of lung cancer, 6 cases of malignant lymphoma, one case of breast cancer, and one of urinary bladder cancer. Squamous cell carcinoma was of the histological type most often associated with metastatic calcification in lung cancer, and ATL in malignant lymphoma. Hypercalcemia was found in 10 (83%) out of cases, and almost all were accompanied by renal dysfunction. Calcium deposits were most frequently observed in the kidneys and the lungs. It has been suggested that metastatic calcification in the lungs and kidneys of a patient with a history of malignancy showing hypercalcemia is sometimes accompanied by respiratory and renal dysfunction, causing the patient's condition to deteriorate.

Adult↗
PubMed1988

[Current therapy of endocrine organ tumors (adrenal and parathyroid glands)].

Since the adrenal or parathyroid cancer is a clinically rare entity. We often have difficulty in its diagnosis and treatment. The adrenocortical cancer is usually classified into two categories--endocrinologically functioning or non-functioning. The incidence is not different between them. It is often found in an advanced stage as it does not show clinical manifestation before it has grown up to a large tumor. Only an effective agent for the adrenal cancer is op'-DDD so far. Recently, cisplatin, VP-16 (etoposide) and others are administered as trial use. Most of malignant pheochromocytomas are endocrinologically active and they often cause hypertension leading to death. Therefore it is important to control hypertension in malignant pheochromocytoma. Chemotherapy and irradiation are not effective for it. Recently, 131I-MIBG (metaiodobenzylguanidine) is found to be useful not only for diagnosis but also treatment of malignant pheochromocytoma. 131I-MIBG is accumulated specifically in the chromaffin cells and with helpful to find out metastatic foci. It is also used in a large amount as a specific irradiation therapy for this malignancy. Parathyroid cancer is found in approximately 3 percent of primary hyperparathyroidism. Clinically it usually reveal serum calcium level higher than 14 mg/dl, bone lesions and renal dysfunction in addition to palpable cervical tumors adhering with skin. Sometimes it is difficult to differentiate malignancy from adenoma in histology. Most cases develop local recurrences and distant metastases in due course and dies of hypercalcemia. It is very important to control hypercalcemia in inoperable cases. As both chemotherapy and radiation therapy render no effect on this malignancy. Surgery is a sole strategy for it.

Adenoma↗
PubMed1988

The binding mode of a mammalian (boar) protamine to DNA.

The binding modes of mammalian and fish protamines to DNA were studied by reconstitution experiments from dansylated protamines and DNA, using fluorescence spectroscopy, thermal denaturation and sedimentation. Both boar and fish protamines showed strong positive cooperativity in binding to DNA. Binding parameters of the protamines were determined in 0.1 M NaCl, 50 mM Tricine-HCl, pH 7.4, at 37 degrees C: in the boar protamine, the cooperative binding constant (Kc) = 3.4 X 10(6) M-1 and the cooperative factor (q) = 667, in the fish protamine, Kc = 1.8 X 10(7) M-1 and q = 304. The boar protamines bound to DNA with two functional domains, but the fish protamines bound directly to DNA as a single linear molecule.

Animals↗
PubMed1988

[Clinical effect of terodiline hydrochloride (TD-758) in patients with urinary disturbances].

We evaluated the efficacy of terodiline hydrochloride (TD-758) in 23 patients with psychosomatic bladder, chronic prostatitis and chronic cystitis. The drug was administered at a dose of 24 mg once a day for 4 weeks. In 78% of the patients the symptoms such as urinary frequency and sense of residual urine improved. Only mild side effects such as thirst were noted. We concluded that terodiline hydrochloride was effective in this trial.

Aged↗
PubMed1988

[The effect of S-adenosyl-L-methionine sulfate tosylate (FO-1561) on survival time in various brain damage models].

The effect of S-adenosyl-L-methionine sulfate tosylate (FO-1561) on survival time in various brain damage models (cerebral anoxia or ischemia) was studied. 1) In KCN-induced or normobaric anoxia of ddY mice, FO-1561 (30-100 mg/kg as amount of S-adenosyl-L-methionine) administered intravenously 15-30 min prior to the treatment showed significant increase of survival time dose-dependently. 2) In asphyxic anoxia of Wistar rats, FO-1561 (100 mg/kg) administered intravenously 15 min prior to the treatment (cessation of artificial respiration) delayed the time until the disappearance of electrocorticogram. 3) In cerebral ischemia of Mongolian gerbils, FO-1561 (50 mg/kg) injected five times at 1 hr interval intraperitoneally 3 hr after the unilateral ligation of common carotid arteries showed significant increase of survival time. These results suggested that FO-1561 may be effective in ameliorating cerebral anoxic or ischemic damage, without observing any side effects like sedation and motor depression which pentobarbital showed with the effective doses in these damage models.

Animals↗
PubMed1987

High-performance liquid chromatography of N-terminal tyrosine-containing oligopeptides by pre-column fluorescence derivatization with hydroxylamine, cobalt (II) and borate reagents.

A pre-column fluorescence derivatization method is described for the high-performance liquid chromatographic determination of N-terminal tyrosine-containing oligopeptides involving methionine-enkephalin and leucine-enkephalin. The peptides are converted into fluorescent derivatives by heating in a weakly alkaline medium (pH 8.5) containing hydroxylamine, cobalt(II) ion and borate. The derivatives are separated on a reversed-phase column (TSKgel ODS-120T) by gradient elution of acetonitrile in a mobile phase containing borate buffer (pH 8.5) and tetra-n-butylammonium chloride, and then determined by fluorimetry. The derivatization provides a single fluorescent product for each N-terminal tyrosine-containing oligopeptide, but does not allow the production of fluorescent derivatives for peptides having no tyrosyl residue at the N-terminal. The method is selective and sensitive; the lower limits of detection for the N-terminal tyrosine-containing oligopeptides tested were 140-310 fmol per 100 microliters injected.

Boric Acids↗
PubMed1987

A ferriprotoporphyrin IX-chloroquine complex promotes membrane phospholipid peroxidation. A possible mechanism for antimalarial action.

The effect of a ferriprotoporphyrin IX-chloroquine complex on phospholipid membranes was investigated on the basis of iron-induced lipid peroxidation using microsomal phospholipid liposomes. The ferriprotoporphyrin IX-chloroquine complex remarkably promoted peroxidative cleavage of unsaturated phospholipids in liposomes, compared with ferriprotoporphyrin IX alone. Neither the combination of protoporphyrin IX with chloroquine nor the combination of Fe3+-ADP with chloroquine promoted lipid peroxidation. DL-alpha-Tocopherol completely inhibited lipid peroxidation induced by the ferriprotoporphyrin IX-chloroquine complex.

Chloroquine↗
PubMed1987

Calcium ionophore A23187 does not stimulate lipopolysaccharide nonresponsive C3H/HeJ peritoneal macrophages to produce interleukin 1.

C3H/HeJ mice are hyporesponsive to the biologic effects of bacterial lipopolysaccharide (LPS). The defect in the strain of mice is believed to be due to the expression of a mutant allele designated Lpsd at the chromosome four locus. The molecular basis of this hyporesponsiveness is not known, but it may result from some defective membrane signal transductions. To examine this possibility, we compared the abilities of interleukin 1 (IL-1) production by C3H/HeJ macrophages with those by C3H/He macrophages (LPS responsive) after stimulation with the calcium ionophore A23187 or phorbol myristate acetate (PMA). A23187 induced IL-1 production by C3H/He macrophages, but it did not induce IL-1 production by C3H/HeJ macrophages and neither did LPS. However, it had the ability to increase intracellular free Ca2+ in C3H/HeJ macrophages as well as in C3H/He macrophages, this being examined by the changes in cytosolic Ca2+ in the macrophages by using Quin 2. In contrast, PMA was able to induce IL-1 production by both C3H/He and C3H/HeJ macrophages without increasing intracellular Ca2+. Since polymyxin B did not inhibit A23187- or PMA-induced IL-1 production by C3H/He macrophages, these results are not due to the little amount of LPS in culture medium, but due to their own characteristics. A calmodulin antagonist W-7 effectively inhibited A23187-induced IL-1 production by C3H/He macrophages. However, it hardly inhibited LPS-induced IL-1 production except at high concentration, and it caused no inhibition of the PMA-stimulated one. These results suggest that the blocking sites expressed phenotypically by the Lpsd are shared by LPS- and A23187-stimulated cellular processes, although the actions of LPS and A23187 are different from each other. In addition to the direct study with LPS or lipid A, A23187 should provide another useful approach to clarify the molecular mechanisms of Lpsd defect in C3H/HeJ macrophages.

Animals↗