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Biomedical subjects

M Kitamura

Publications and source records attributed to M Kitamura.

At least 505 records · Page 28Linked to original sources
PubMed1988

[A case of solitary metastasis of renal cell carcinoma to the thyroid gland].

A case of solitary metastasis of renal cell carcinoma to the thyroid gland is reported. A 63-year-old-woman had been found to have an abnormal mass in the neck since April, 1986. She had a past history of right nephrectomy owing to right renal tumor 6 months earlier. Histological examination of the renal tumor revealed, common type, alveolar type, G1, INF alpha renal cell carcinoma. No metastasis was found on abdominal CT, chest tomography and bone scintigram at that time. Radical thyroidectomy was performed on June, 23, 1986. Histological examination by hematoxylin and eosin staining revealed metastasis of renal cell carcinoma, and immunohistochemical technique ruled out primary thyroid carcinoma. Postoperatively no other metastasis was found on head-chest-abdomen-CT, chest-tomography or bone scintigram. Therefore no particular adjuvant therapy was performed.

Carcinoma, Renal Cell↗
PubMed1987

Binding ability of Clostridium botulinum neurotoxin to the synaptosome upon treatment of various kinds of the enzymes.

The binding ability of Cl. botulinum neurotoxin to synaptosomes upon treatment with various enzymes (neuraminidase, trypsin, and beta-bungarotoxin containing phospholipase A2 activity) was studied. When synaptosomes were treated with neuraminidase, their ability to bind toxin decreased; trypsin and beta-bungarotoxin had slightly week or no effect. The decrease in toxin-binding ability of synaptosomes was paralleled by a release of sialic acid from the synaptosomes by the neuraminidase treatment. The toxin-binding ability of synaptosomes treated with neuraminidase was lower than untreated ones at a high concentration of sodium chloride. The binding of the toxin to synaptosomes occurred at least at the two types of structural sites, one site which contained sialic acid, and other site which was sensitive to high ionic strength. It may be possible that another binding state except these is present at the synapse.

Animals↗
PubMed1987

Two-stage operation for poor-risk patients with carcinoma of the esophagus.

We have devised a two-stage operation for poor-risk patients with carcinoma of the thoracic esophagus. The first-stage operation consists of a right thoracotomy, subtotal esophagectomy, and lymph node dissection. Two to three weeks later, the second-stage operation of esophageal reconstruction with gastric tube is performed under laparotomy. During this 3-week period of no esophagus, the nutritional status can be adequately maintained by intravenous hyperalimentation. We describe herein the technique, postoperative complications, and mortality of our two-stage operation as compared with events during an ordinary one-stage operation for carcinoma of the thoracic esophagus.

Adult↗
PubMed1987

Screening for adenine and hypoxanthine phosphoribosyltransferase deficiencies in human erythrocytes by high-performance liquid chromatography.

A screening method using high-performance liquid chromatography (HPLC) for the simultaneous detection of deficiencies of adenine phosphoribosyltransferase (APRT) and hypoxanthine phosphoribosyltransferase (HPRT) activities in human erythrocytes is described. Both enzyme reactions of APRT and HPRT in lysates treated with a charcoal-dextran were simultaneously carried out in the same reaction tube and the enzyme activities were determined by measuring the increases in absorbance at 260 nm of adenosine and inosine converted from adenosine-5'-monophosphate and inosine-5'-monophosphate with alkaline phosphatase. Adenosine and inosine were separated from adenine and hypoxanthine by a reversed-phase column. The method could detect 1% of normal APRT activity and 0.3% of normal HPRT activity. The within-run coefficients of variation for APRT and HPRT activities were 3.2 and 3.4%, respectively.

Adenine Phosphoribosyltransferase↗
PubMed1987

A pseudotumor of the urinary bladder secondary to diverticulitis of the sigmoid colon with colo-vesical fistula: a case report.

A case of pseudotumor of the urinary bladder secondary to diverticulitis of the sigmoid colon with colo-vesical fistula is reported. Computed tomography and cystoscopy of the granulomatous mass caused by the inflammation suggested a colon or bladder cancer. A transurethral biopsy from the tumor was therefore performed at first, but showed only inflammation. Because primary bladder cancer was ruled out, partial cystectomy and partial colectomy were subsequently performed. Through histological examination the mass proved to be an inflammatory granuloma.

Adult↗
PubMed1987

The significance of pre-operative diagnosis of esophageal cancer using esophageal mediastinal ultrasonography.

Esophageal ultrasonography (EUS) is a new diagnostic method which allows improved preoperative diagnosis of esophageal cancer. Careful examination of EUS findings and comparison of these findings with operative and pathological findings yielded criteria useful for the determination of tumor depth and lymphnode metastasis. Concerning tumor depth, EUS findings of 30 patients were reviewed and compared with operative and pathological findings. Based on this comparison some diagnostic criteria were then chosen; it was found that the accuracy was around 87% and that the differentiation between intramural and extraluminar invasion could be easily made using these criteria. Regarding the lymphnodes, at the time of operation, the site and size of each lymphnode (a total of 267 nodes) were recorded. These findings were grouped according to the site and size. We found the range of sizes of metastatic lymphnodes to be great and not so different from that of normal nodes. We then compared these anatomical findings with the EUS findings in an attempt to determine appropriate diagnostic criteria, which would include size as well as intrinsic and extrinsic echocharacteristics. When these criteria were used, the accuracy was about 90%. Although this preliminary study must be confirmed by further prospective studies with a large number of patients, we can conclude that EUS allows accurate determination of tumor depth and node metastasis in patients with esophageal cancer.

Diagnostic Errors↗
PubMed1987

Effect of estrogen treatment on testicular gonadotropin receptors in prostatic cancer patients.

Effects of estrogen treatment on testicular human chorionic gonadotropin (hCG) and follicle-stimulating hormone (FSH) receptors in man were investigated. Ten patients (aged 58 to 75, mean 67 years) with prostatic cancer were treated with diethylstilbestrol diphosphate (DESDP) (300 mg daily, oral administration). They were divided into two groups: 5 of them (aged 58 to 74, mean 67 years) were orchiectomized after 7 days of treatment and the remainder (aged 60-75, mean 67 years) after 6 months of treatment. hCG and FSH receptors in the resected testes of each group were measured and compared with those of age-matched prostatic cancer patients without any treatment (controls). After 7 days and 6 months of DESDP treatment, the number of hCG receptors decreased to approximately 53% and 24%, respectively, of that of the controls. FSH receptors in the testes of the patients treated with DESDP did not differ significantly from those of the controls.

Aged↗
PubMed1987

Selective treatment of metastatic lymph nodes with combination of local hyperthermia and temperature-sensitive liposomes containing bleomycin.

Temperature-sensitive liposomes are designed to break down and release their contents preferentially at temperatures attainable by local hyperthermia. The antitumor effects of hyperthermia and anticancer drugs selectively delivered by temperature-sensitive liposomes in metastatic lymph nodes in rats were determined. Temperature-sensitive liposomes containing bleomycin (BLM) were injected sc into the dorsal surface of the right hindfoot of rats bearing AH66 ascites tumor implanted 7 days previously into a right popliteal lymph node. To break down these temperature-sensitive liposomes preferentially in the metastatic lymph nodes and to achieve the synergistic effects of local hyperthermia and BLM, we applied local hyperthermia to the right popliteal lymph node by making use of a water bath at 44 degrees C for 20 minutes. There was a significant difference in suppression of tumor growth and prolonged survival in rats receiving both temperature-sensitive liposomes containing BLM and local hyperthermia, compared with groups receiving hyperthermia alone, water solution of BLM alone, or a combination of both (P less than 0.05). The possibility that hyperthermia plus temperature-sensitive liposomes will enhance therapy for patients with metastatic lymph nodes warrants attention.

Animals↗
PubMed1987

Liver metastasis of colon 26 cells implanted into the superior mesenteric vein in mice.

The intraportal implantation of mouse transplantable colon adenocarcinoma 26 was investigated as an experimental liver metastasis model of colorectal cancer. CDF1 male mice (5 weeks old) were laparotomized under pentobarbital sodium anesthesia, and colon 26 tumor cells (1 X 10, 1 X 10(3), or 1 X 10(5) cells) were inoculated into the superior mesenteric vein. On day 21 after inoculation, mice inoculated with 1 X 10(3) tumor cells showed five to 12 colonies of liver metastasis (mean, 9.2 colonies; n = 6). The survival time was 27 to 36 days (median, 27 days; n = 5) in these mice. When mitomycin C (MMC) was administered into the superior mesenteric vein 15 min after the inoculation of tumor cells, the number of metastatic foci in the liver was strongly inhibited; 81.1% and 100% inhibitions were observed in the groups given 4 mg/kg and 6 mg/kg of MMC, respectively. The mouse colon 26 model seems to be one of the more useful experimental models for evaluating treatments for the prevention of liver metastases from colorectal cancer.

Adenocarcinoma↗