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Biomedical subjects

M Shirai

Publications and source records attributed to M Shirai.

At least 271 records · Page 15Linked to original sources
PubMed1986

Evaluation of therapeutic efficacy in psychogenic impotence by means of logarithmic scoring.

In an attempt to develop as objective a method for the evaluation of impotence as possible, the authors assigned numerical values to four parameters considered essential to sexual function, namely, libido, erection, ejaculation, and orgasm, and used the sum totals of these scores, collected before and after initiation of therapy, as indicators of overall sexual function. Numerical values were assigned according to a logarithmic scale, in four stages from 0 to 10, i.e., 0, 1, 3, and 10; a score of 0 signified "normal" and a score of 10, "abnormal." By comparing sum totals of scores computed before and after initiation of therapy, the authors were able to evaluate therapeutic efficacy on the basis of changes in these sum totals. Using this method, the mean total score for a control group of 24 normal subjects was 1.67 +/- 0.26 (mean +/- standard error). For the test group, which consisted of 24 patients of psychogenic impotence, the mean total score prior to initiation of therapy was 16.46 +/- 3.55, an extremely high score in comparison with the control group. After four weeks of therapy, the mean total score dropped to 9.37 +/- 1.77, indicating a statistically significant (p less than 0.05) decrease over the pre-therapy mean total score.

Adult↗
PubMed1986

Rabbit autoantibodies to actin induced by immunization with modified homologous actins.

Actin is a major antigen involved in the reaction of smooth muscle antibody positive sera from patients with chronic active hepatitis. In the present study, actin extracted from rabbit skeletal muscle was denatured by sodium dodecyl sulfate and was immunized into the rabbit, a homologous animal for actin. The rabbits, thus immunized, produced antibodies reactive with actins of homologous and heterologous animals. In addition, the antibodies showed reactivity with autologous actin. It indicates that the denatured homologous actin is capable of terminating immunological tolerance to actin and induces formation of autoantibody to rabbit actin. This phenomenon may be implicated in the occurrence of anti-actin antibody in sera from patients with chronic liver disease and several other diseases.

Actins↗
PubMed1986

Spermatogenesis in Snell dwarf, little and congenitally hypothyroid mice.

The status of spermatogenesis in Snell dwarf, little and congenitally hypothyroid mice was studied. In all of these mice with a hormone deficiency the seminiferous tubules were smaller in size and contained fewer spermatogonia, spermatocytes, spermatids and spermatozoa than did those of normal control mice. There was no substantial difference in the Johnsen score between the hormone-deficient mice and normal control mice, but the former had underdeveloped seminiferous tubules with a corresponding paucity of germ cells, which may be partly responsible for the infertility of these mice. In the present study, growth hormone and thyroxine were administered separately to growth hormone-deficient and thyroxine-deficient mice, respectively. Such replacement therapy brought about an increase in cell counts of the seminiferous tubules and in sperm counts in both groups.

Animals↗
PubMed1986

Renal cell carcinoma originating from dysplastic kidney.

A case of renal cell carcinoma developing from a unilateral dysplastic kidney is presented. The patient was a 33-year-old woman who had lumbago one year and a half prior to death. Multiple abnormal uptakes of 67Ga were seen by scintigraphy. Bone marrow biopsy indicated adenocarcinoma but the primary site was unknown despite extensive examination. At autopsy the carcinoma was wide-spread but no obvious primary-appearing lesion was detected in all the organs except the left kidney. Incidentally the patient had unilateral (left) renal dysplasia. An elaborate study revealed the primary site of the carcinoma within the cystic structure of the dysplastic kidney. This tumor showed reactivity with Dolichos biflorus agglutinin associated antigen (DBA-Ag), soybean agglutinin (SBA), and peanut agglutinin (PNA) which have reactivity with renal tubules.

Adult↗
PubMed1986

Cardiac sympathetic nerve activity and heart rate during coronary occlusion in awake cats.

Responses in efferent cardiac sympathetic nerve activity (CSNA) and heart rate (HR) to a 100-s anterior descending coronary artery occlusion were measured in cats under awake, atropinized, anesthetized, or anesthetized and atropinized states. In the conscious state, at 20 and 90 s of occlusion, CSNA increased by 23% and then decreased by 7%, respectively, whereas HR decreased by 5 and 17%, respectively. With atropinization and/or anesthesia, the initial increase in CSNA was inhibited and the later decrease in CSNA was enhanced, whereas the bradycardia was diminished. HR changed in proportion to CSNA responses with high correlations, i.e., r = +0.89, +0.90, +0.96, and +0.91 for the four states, respectively. In the conscious state, the CSNA-HR relation line shifted toward bradycardia, but this shift was blocked by atropinization and anesthesia. This finding suggested that, in the conscious state, cardiac vagal nerve activity (CVNA) increased immediately and did not decrease during occlusion. At the early stage of occlusion, HR response (bradycardia or tachycardia) was determined by the relative contribution of enhanced CSNA and CVNA. At the later stage of occlusion, bradycardia was induced by a combination of decreased CSNA and enhanced CVNA. In anesthesia and/or atropinization it was induced mainly by the decreased CSNA.

Anesthesia↗
PubMed1986

Effects of regional alveolar hypoxia and hypercapnia on small pulmonary vessels in cats.

Using an X-ray TV system, we analyzed responses in the internal diameter (ID), flow velocity, and volume flow in small pulmonary vessels (100-600 microns ID) during unilobar hypoxia and hypercapnia in cats. In the hypoxic and hypercapnic lobes, the ID reduced in proportion to the degree of hypoxia and hypercapnia, respectively. The ID reduction was larger in the arteries than in the veins for a given stimulus. In the arteries, the ID reduced nonuniformly in the series-arranged vessels in response to both stimuli. The percentage ID reduction was maximal in the arteries of 200-300 microns ID, in which it was 21, 26, 28, and 36% with 5% O2, 0% O2, 5% CO2, and 10% CO2 inhalations, respectively. On the other hand, in the veins, uniform ID reduction occurred for a given stimulus. In the contralateral normoxic lobe, the ID did not change significantly. In both hypoxic and hypercapnic lobes, the flow velocity and volume flow of the small arteries decreased, with 5% O2, by 18 and 40%, respectively, and, with 5% CO2, by 23 and 50%, respectively. In contrast, in the normoxic lobe, they increased significantly during 5% O2 and 5% CO2 inhalations. We concluded that regional alveolar hypoxia and hypercapnia induced a local vasoconstriction particularly in the small arteries of 200-300 microns ID and decreased the flow velocity and volume flow in the same lung region.

Angiography↗
PubMed1986

[Intra-tumoral injection therapy in patients with hepatocellular carcinoma].

Ten patients with hepatocellular carcinoma (HCC) received intra-tumoral injection of OK-432 (6 patients), 99.5% ethanol (2 patients) or both (2 patients). Under ultrasonographic control, a PTC needle (22 G) was inserted percutaneously into the tumor and OK-432, which was prepared with a solution of Su-strain Streptococcus pyogenes A3, or 99.5% ethanol was injected. Patients were injected with OK-432 repeatedly at one-to two-week intervals (up to 5 times) for a total duration of 5 to 15 weeks. The degree of skin test reaction for Streptococcus pyogenes was increased in all patients after the treatment. Over 40% tumor regression was noted in 6 out of 9 patients who received intra-tumoral injection of OK-432. Complete regression was noted in one patient. Before treatment, Interleukin-2 (IL-2) and lymphokine-activated killer (LAK) cell activity in peripheral blood lymphocytes decreased in HCC patients. Two of 6 patients showed markedly increased activity of LAK-cells one week after treatment with OK-432. One other patient had moderately increased LAK-cell activity after treatment with OK-432. No increase in LAK-cell activity was seen in 3 patients who received intra-tumoral injection of ethanol. An especially increased response of LAK-cell activity was seen in patients with small-sized HCC (diameter below 5 cm).

Administration, Topical↗
PubMed1986

[Toxicological studies on (2''R)-4'-O-tetrahydropyranyladriamycin, a new antitumor antibiotic. Acute toxicity study in mice].

A new antitumor anthracycline antibiotic; (2''R)-4'-O-tetrahydropyranyladriamycin hydrochloride (THP) was administered to ddY mice via different routes for acute toxicity studies. The LD50 values were calculated from mortality rates during a 14-day observation period, and were 14-21 mg/kg when i.v., i.p. or s.c. route was used and 420-570 mg/kg when the drug was given p.o. Upon administration of the drug, mice showed depression of spontaneous activity, anorexia, diarrhea and slight alopecia. Autopsy of the mice killed by the drug revealed atrophy of thymus, spleen, testes, uterus and ovaries, and congestion and hemorrhage in the intestines. The mice which survived through the observation period, however, showed only atrophy of thymus and sexual organs.

Administration, Oral↗
PubMed1986

Toxicological studies on (2"R)-4'-O-tetrahydropyranyladriamycin, a new antitumor antibiotic. Subacute toxicity study in rats.

(2"R)-4'-O-Tetrahydropyranyladriamycin X HCl (THP), a new anthracycline antitumor antibiotic, was administered to Sprague-Dawley rats intraperitoneally for 13 weeks. In rats receiving 0.4 mg/kg/day, piloerection, emaciation, loose feces and thickening of the injection site were evident, and 7 males and 2 females died after week 12. Inferior body weight gain was observed in both sexes starting week 4 approximately 6. The food consumption also decreased. Hematological examination revealed lower counts of total leucocyte and lymphocyte. At termination there were lower spleen, thymus and testes weights, thickening of the walls of the intestine and stomach, gastric ulceration, presence of ascitic fluid, and congestion and thickening at the injection site. Decreases in the lymphocyte populations of the thymus, spleen and lymph nodes were observed microscopically. A decrease in the number of hematopoietic cells in the bone marrow and a degeneration of the germinal epithelium in the testes were also seen, as were gastrointestinal disturbances. These treatment-related effects were mainly confined to rats receiving 0.4 mg/kg/day and to a lesser extent, to rats receiving 0.1 mg/kg/day. The effects on rats receiving 0.025 mg/kg/day were only at the microscopic level. No rats receiving 0.006 mg/kg/day were toxicologically affected.

Animals↗
PubMed1986

Toxicological studies on (2"R)-4'-tetrahydropyranyladriamycin, a new antitumor antibiotic. Chronic toxicity study in rats.

(2"R)-4'-O-Tetrahydropyranyladriamycin X HCl (THP), a new anthracycline antitumor antibiotic, was administered to Sprague-Dawley rats (each group 20 rats) intraperitoneally at dosages of 0.001, 0.008, 0.06 and 0.3 mg/kg/day for 53 weeks. Piloerection, loose feces or perianal staining and thin or emaciated build were observed from week 12 in rats receiving 0.06 or 0.3 mg/kg/day. All rats receiving 0.3 mg/kg/day and 3 males and 1 female receiving 0.06 mg/kg/day died or were prematurely sacrificed in the period from weeks 13 to 44. The overall food consumption and body weight gain of both sexes receiving 0.06 or 0.3 mg/kg/day were lower than those of the controls. Hematological examination showed low leucocyte counts, disturbance in neutrophil and lymphocyte number and low erythrocytic characteristics in animals receiving 0.06 or 0.3 mg/kg/day. At necropsy, macroscopic changes were found at the injection site, throughout the gastrointestinal tract and in the male reproductive system in rats receiving 0.06 or 0.3 mg/kg/day. Microscopic examination revealed decrease in the small lymphocyte population in the hematopoietic and lymphoid system in rats receiving 0.008 to 0.3 mg/kg/day. Degeneration of the germinal epithelium of the subcapsular tubules of the testes, gastric ulceration, epithelial adnexal atrophy of the skin and chronic cellulitis and necrosis at the injection sites were also observed. No rats receiving 0.001 mg/kg/day were affected in these respects.

Animals↗
PubMed1986

[Effect of (2"R)-4'-O-tetrahydropyranyladriamycin, a new antitumor antibiotic, on the cardiac function of hamsters].

Cardiovascular effects of (2''R)-4'-O-tetrahydropylanyladriamycin X HCl (THP) and doxorubicin (adriamycin, ADM) were studied in hamsters. In experiments to observe acute effects, THP was administered intravenously at a dose of 12.5, 25.0 or 50.0 mg/kg, and ADM at 1.56, 3.13 or 6.25 mg/kg was given to different subjects. The THP caused slight ECG alterations at a dose of 12.5 mg/kg. At a dose of 25.0 mg/kg or 50.0 mg/kg, THP caused moderate to remarkable alterations in ECG like a widening of PR and PRc interval, A-V block, ST segment depression and T wave flattening. The ADM caused moderate to remarkable alterations in ECG at a dose of 3.13 mg/kg or 6.25 mg/kg, including arrhythmia, bradycardia, A-V block, ST segment changes and T wave flattening. These changes caused by THP and ADM recovered within 5 approximately 10 minutes after injection. Alterations in the ultrastructure of the myocardium caused by THP at a dose of 50.0 mg/kg included some cells with slight changes like swelling of mitochondria, focal intracellular edema, and enlargement of myofibrils. The ADM, at a dose of 3.13 mg/kg, induced severer swelling of mitochondria than THP, dilatation of sarcoplasmic reticulum, intracellular edema, and disorganization of myofilaments. At a dose of 6.25 mg/kg of ADM, these changes became more pronounced. In experiments to observe subacute effects, hamsters were treated with THP or ADM by daily intraperitoneal injections for 15 consecutive days, and then allowed to be recovered for 15 days. Dose levels of THP or ADM were 0.125, 0.25, 0.5 and 1.0 mg/kg. General toxicity, ECG, hematological and blood biochemical analysis, and electron microscopic examination were studied. In the ECG study, THP-treated hamsters showed a reversible elevation of R wave amplitude at a daily dose of 0.5 mg/kg. Widening of PR and PRc interval, elevation of R and S wave amplitude, and reduction of T wave amplitude were observed at a daily dose of 1.0 mg/kg of THP. Hamsters treated with ADM showed increase of heart rate, reduction of T wave amplitude, and shortening of PR and PRc interval at a daily dose of 0.5 mg/kg. Severe changes were observed at a daily dose of 1.0 mg/kg of ADM including an increase of heart rate, elevation of R wave amplitude, reduction of S and T wave amplitude, and shortening of QT interval. The electron microscopic examination revealed that THP-treated hamsters showed separation of intercalated discs, formation of myelin structure, and dilatation of T-tubules at a daily dose of 1.0 mg/kg. Similar changes were caused by ADM at a daily dose of 0.25 to 1.0 mg/kg.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMed1986

[Effect of (2"R)-4'-O-tetrahydropyranyladriamycin, a new antitumor antibiotic, on the bone marrow function of rabbits. (1) Intravenous administration by a single bolus injection].

New Zealand White rabbits were treated with (2"R)-4'-O-tetrahydropyranyladriamycin-HCl (THP), a new antitumor antibiotic, by an intravenous bolus injection at a dose of 1, 2 or 4 mg/kg. The peripheral leucocyte counts decreased markedly at doses of 2 and 4 mg/kg 1 to 7 days after injection, and the lymphocytes and neutrophils were affected. The nucleated cell count decreased in the bone marrow. Especially 3 days after injection, remarkable reductions of erythroids and immatured myelocytes were observed, with a subsequent rise of the matured myelocytes ratio in bone marrow cell constituents. These changes resulted in a marked increase of M/E ratio. Doxorubicin also showed an inhibitory effect on the bone marrow function of rabbits but the effect was slightly lower than THP. These changes of bone marrow cells reverted 7 days after injection and the recovery of the reduced peripheral leucocyte was also observed 14 days after injection. Therefore, it can be concluded that THP showed suppressive but reversible effects on the bone marrow function of rabbits.

Animals↗