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Biomedical subjects

M Kogata

Publications and source records attributed to M Kogata.

10 recordsLinked to original sources
PubMed1996

Anorectal stenosis in a neonate: report of a case and review of the Japanese literature.

We report herein the case of an infant with anorectal stenosis successfully treated by staged surgery. At 1 day of age, the anal orifice showed circumferential stenosis located 5 mm from the anal verge and extending into the anal canal for approximately 1 cm; however, no hypertrophic raphe or bucket handle appearance were observed, and no associated anomalies such as a presacral mass or sacral dysgenesis were found. At 2 days of age, the infant underwent a sigmoid colostomy under the diagnosis of low anorectal stenosis, followed by a successful anorectoplasty, performed through a sacroperineal approach when he was 8 months old. An analysis of 13 other cases of anorectal stenosis from the Japanese literature indicates that this type of malformation should be treated by staged surgery, as an initial colostomy in the neonatal period, followed by anorectoplasty through a sacroperineal approach during infancy.

Anus Diseases↗
PubMed1995

Surgical technique of laparoscopic pyloromyotomy for infantile hypertrophic pyloric stenosis.

We report herein a new method of performing laparoscopic pyloromyotomy for infantile hypertrophic pyloric stenosis, using refined surgical techniques. The pyloric tumor was immobilized by grasping the first portion of the duodenum and the anterior wall of the stomach, and electrocoagulation was used prior to incising the pyloric tumor to minimize bleeding during the procedure. Although this technique has been applied in only two patients so far, we present the details herein. We believe that with technical and instrumental refinements, the speed and safety of laparoscopic pyloromyotomy will improve and it will become an alternative to open surgery in pediatric patients.

Female↗
PubMed1995

Spiral computed tomography for biliary dilatation.

Spiral computed tomography (SCT), which consists of rapid volumetric data acquisition and planar image display, was performed on 12 patients with biliary dilatation after excisional procedure. The technique was evaluated for image quality and impact on clinical practice. All patients safely underwent SCT scanning after intravenous cholangiography (IVC) without any sedations. In 11 of 12 patients reliable biliary images were obtained and three-dimensional (3D) reconstruction images of the biliary system with bilioenteric anastomosis were generally of diagnostic quality even in young children. As a consequence, IVC-SCT technique appears to have the potential for improving the efficacy and safety of diagnostic CT in investigation of the biliary system. In particular, this technique may be useful for detecting bilioenteric anastomotic conditions in follow-up studies of pediatric patients with biliary dilatation.

Adolescent↗
PubMed1991

Inhibition by selenium of intrahepatic cholangiocarcinoma induction in Syrian golden hamsters by N'-nitrosobis(2-oxopropyl)amine.

The effects of selenium supplementation on induction of cholangiocarcinomas and related precancerous lesions in female Syrian Golden hamsters by N'-nitrosobis(2-oxopropyl)amine (BOP) were investigated. Four-week-old animals were divided into two groups according to the selenium level contained in the drinking water (0.1 ppm or 4.0 ppm) and fed a purified diet containing less than 0.05 ppm of the trace element. Starting at Week 4 of the experiment, hamsters were administered 10 weekly injections of BOP (10 mg/kg body wt) and then killed 18 weeks after the last carcinogen administration. Animals receiving physiological saline alone served as controls. Cholangiocellular carcinomas tended to be reduced, and putative preneoplastic lesions of cholangiofibrosis were significantly decreased in the high-as opposed to the low-selenium groups in terms of both incidence rate and number per effective animal. The respective high and low selenium values for incidence and number were 24/38% and 0.34/0.66, respectively, for cholangiocarcinomas and 50/89% and 1.21/8.44, respectively, for cholangiofibroses. Proliferation of intrahepatic bile ducts was also significantly inhibited in the high-selenium group along with cyst formation. Biochemical investigation revealed both selenium level and glutathione peroxidase activity to be significantly greater in the high-than in the low-selenium group livers. The results thus suggest that selenium may inhibit BOP-induction of bile duct lesions, possibly via glutathione peroxidase-mediated alteration of carcinogenesis.

Adenoma, Bile Duct↗
PubMed1990

Inhibitory effect of selenium on hamster pancreatic cancer induction by N'-nitrosobis(2-oxopropyl)amine.

The effect of selenium intake on the development of pancreatic cancer was investigated in female Syrian golden hamsters. Four-week-old hamsters were divided into 2 groups according to the selenium level in their drinking water and were fed a purified diet containing less than 0.05 ppm selenium. Starting 4 weeks later, groups received 10 s.c. injections at weekly intervals of N'-nitrosobis(2-oxopropyl)amine (BOP) dissolved in saline, while controls received saline alone. When the animals were killed 18 weeks after the last injection, palpable tumors were less frequent in the high-selenium group than in animals receiving low-selenium supplement, the numbers of histologically diagnosed cancerous lesions also being significantly reduced by high selenium intake. The selenium level and glutathione peroxidase activity in serum and pancreas were significantly greater in the high-selenium group. Moreover, selenium levels and glutathione peroxidase activity were both significantly higher in tumor-bearing tissue. The results suggest that glutathione peroxidase is involved as an intermediate factor in prevention of carcinogenesis by selenium.

Animals↗
PubMed1989

Effectiveness of peanut agglutinin-binding glyco-related antigen and cyclophosphamide on metastasis of Lewis lung carcinoma.

Soluble tumor-associated antigens were isolated from Lewis lung carcinoma (3LL) cells by detergent solubilization and purified by affinity chromatography on peanut agglutinin (PNA)-agarose. Subcutaneous injection of PNA-binding glyco-related antigen into 3LL-bearing male C57BL/6 mice significantly augmented delayed-type hypersensitivity (DTH), and also inhibited the growth of the primary 3LL tumors. The effects of combined immunotherapy and chemotherapy with this antigen and cyclophosphamide (CY) were examined following excision of 3LL by determining the number of pulmonary surface nodules and wet weight of the lungs. Injection of PNA-binding glyco-related antigen and CY significantly inhibited pulmonary metastasis and prolonged the survival of the mice. The spleen cells obtained from mice with combined treatment showed higher neutralizing activity against 3LL cells than other groups. Therefore, combined immuno and chemotherapy may be useful in preventing metastasis.

Animals↗
PubMed1986

Inhibitory effect of dietary selenium on carcinogenesis in rat glandular stomach induced by N-methyl-N'-nitro-N-nitrosoguanidine.

The influence of dietary selenium on the incidence of stomach carcinoma induced by N-methyl-N'-nitro-N-nitrosoguanidine was studied in 108 rats that survived for over 10 wk. The incidence of glandular stomach cancer in the high-selenium (4.0 ppm) diet group (20 carcinomas in 54 rats) was lower than in the low-selenium (0.1 ppm) diet group (33 carcinomas in 54 rats). The selenium level and glutathione peroxidase activity in the blood, liver, and stomach mucosa were significantly higher in the high-selenium diet group than in the low-selenium diet group. Glutathione peroxidase activity as well as the concentration of selenium in the glandular stomach was increased significantly in the high-selenium diet group.

Adenocarcinoma↗
PubMed1985

Postoperative immunization with peanut agglutinin-binding glycoprotein from Lewis lung carcinoma in mice.

The effects of postoperative immunization with purified tumor-associated antigens on the development of lung metastases following excision of the Lewis lung carcinoma (3LL) were investigated. Soluble tumor-associated antigens were isolated from 3LL cells by detergent solubilization and purified by affinity chromatography on peanut agglutinin (PNA)-agarose. The immunization with subcutaneous injections of PNA-binding glycoproteins (PNA receptors) at the early phase following excision of primary footpad tumors of 3LL resulted in a significant decrease in incidence and size of lung metastases. The delayed immunization, however, failed to suppress the development and growth of metastatic lung tumors after surgery. The suppression in postoperative development of lung metastases was found to depend on the scheduling of immunization following local tumor excision. Splenectomy performed simultaneously with amputation of the tumor-bearing leg completely abolished the decrease in the development and growth of postoperative lung metastases in immunized mice. The involvement of the lymphoid system in the control of metastatic tumor growth was also confirmed in an in vivo tumor neutralization assay utilizing the spleen cells.

Animals↗
PubMed1983

[Role of the spleen in tumor immunity--with special reference to anti-tumor immunity induced by solubilized and purified tumor-associated antigen].

The effects of post-operative immunization with purified tumor-associated antigen on the development of lung metastases following resection of the Lewis lung carcinoma (3LL) were studied. The soluble tumor-associated antigens were isolated from 3LL cells by detergent solubilization and purified by affinity chromatography on peanut agglutinin (PNA)-agarose. The immunization with subcutaneous injections of PNA-binding glycoproteins at early phase following resection of primary footpad tumors of 3LL resulted in a significant decrease in incidence and size of lung metastases. The delayed immunization, however, failed to suppress the development and growth of metastatic lung tumors after surgery. The suppression of postoperative development of lung metastases was found to depend on timing of immunization following local tumor resection. Splenectomy performed simultaneously with amputation of tumor-bearing leg was completely abolished the decrease in the development and growth of postoperative lung metastases in immunized-mice. Evidence of lymphoid system involvement in the control of metastatic tumor growth was also supported by the observation of in vivo tumor neutralization assay utilizing the spleen cells.

Animals↗