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Biomedical subjects

T Yano

Publications and source records attributed to T Yano.

At least 667 records · Page 37Linked to original sources
PubMed1988

Serotherapy of cancer: cellular changes in primary rat mammary carcinomas after infusion of syngeneic sera absorbed with protein A-Sepharose.

Serotherapy and plasma therapy have proved to be effective in the treatment of diverse neoplasms. The mechanisms of the tumoricidal or growth-inhibitory effects are unknown. We previously reported that activation of the alternative pathway of complement in absorbed sera correlated with the presence of anti-tumor activity. Complement components generated during absorption may serve as the initial mediators of cytotoxicity; for example, C5a may function in its role as a chemo-attractant. To further investigate the anti-tumor mechanisms, we undertook a series of sequential histological studies of in vivo changes in tumors following i.v. serotherapy. We found diffuse inflammatory cellular infiltrates in the interstitial compartments of primary mammary carcinomas of rats within 3-4 hr of administration of protein A-Sepharose absorbed syngeneic serum. The number of inflammatory cells was significantly higher in tumors from treated rats: total infiltrating cells (p = 0.002), eosinophils (p = 0.001), neutrophils (p = 0.001), macrophages (p = 0.001), lymphocytes (p = 0.004) and plasma cells (p = 0.001). Also, the mitotic index of tumor cells was significantly lower 4 hr after serotherapy when compared with that of untreated rat tumor cells. C3 in tumor tissue was decreased at 4 hr following serotherapy. Fibrosis was present in tumor nodules with retarded growth 5 weeks after the start of serotherapy. Localization of the infiltrating cells to tumor interstitial compartments prevents direct contact between inflammatory cells and neoplastic cells, making it unlikely that direct cell-cell killing occurs. Indirect cell killing within the tumor bed apparently occurs through several mechanisms involving interactions between serotherapy-initiated humoral mediators and inflammatory cells. The resulting anti-tumor effects include microvascular injury leading to localized ischemia, tumor infarction, and fibroblastic reactions obstructing tumor invasion and growth.

Animals↗
PubMed1988

Role of tumor-infiltrating lymphocytes in the host defense mechanism against lung cancer.

Tumor-infiltrating lymphocytes (TIL) and tumor-associated macrophages (TAM) were recovered from 22 patients with primary lung cancer. The TIL did not exhibit any cytolytic activity against various target cells. The average percentage of TIL recovered was 6.7 +/- 1.3% in patients without recurrence, as compared to 3.6 +/- 0.6% in those with recurrence within 2 years after complete resection of lung cancer (P less than 0.05). The average cytostatic activity of TAM was 38.5 +/- 6.8% in patients without recurrence, although it was 25.2 +/- 4.6% in those with recurrence within 2 years after complete resection (P less than 0.1). The activity of macrophage activating factor (MAF) induced by TIL was also higher in patients showing no recurrence. A significant positive correlation was observed between MAF activity induced by TIL and the cytostatic activity of individual TAM. These results suggest that antitumor activity of TAM may be controlled by specifically sensitized TIL through lymphokines.

Adenocarcinoma↗
PubMed1988

Immunohistological characterization of human monoclonal antibody against lung cancer.

Using immunoperoxidase staining method, a human monoclonal antibody (MAb), termed HB4C5, which was generated by fusion of NAT-30 cells with regional lymph node lymphocytes from a lung cancer patient, was examined for tumor specificity. The determinant recognized by HB4C5 MAb was well preserved in usual formalin-fixed paraffin-embedded tissue sections. Experiments with four major histological types of the lung cancer showed that HB4C5 MAb reacted with adenocarcinoma (19/27), squamous cell carcinoma (2/15), and large cell carcinoma (4/6), but not with small cell carcinoma (0/7). The immunoreaction was seen in the cytoplasm. In addition, this MAb also reacted with some gastric and colon adenocarcinomas. Further study on normal lung and nonpulmonary tissues revealed that HB4C5 MAb bound only type II pneumocytes and proximal tubules of normal kidney.

Adenocarcinoma↗
PubMed1988

Medulloblastoma in infancy associated with omphalocele, malrotation of the intestine, and extrophy of the bladder.

A successfully treated case of infantile medulloblastoma is presented that was associated with omphalocele, malrotation of the intestine, and extrophy of the bladder. A 5-month-old boy was admitted due to disturbance of consciousness and was diagnosed by computed tomography as having a medulloblastoma. Ventricular drainage, subduralperitoneal shunt, and removal of the tumor were performed, and postoperatively radiation therapy was administrated with 4,000 rad to the whole brain. He was discharged in good condition and no evidence of recurrence was observed at the 14th post-operative month. Medulloblastomas associated with congenital anomaly of the abdomen have been only rarely reported. The authors postulate that between the second and third month of gestation an intrinsic or extrinsic factor may have caused the development of the medulloblastoma, as well as anomalies of the abdomen such as omphalocele, malrotation of the intestine, and extrophy of the bladder.

Cerebellar Neoplasms↗
PubMed1988

Pancreatic pseudocyst involving the spleen.

Pancreatic pseudocyst involving the spleen in a 52-year-old man is reported, with review of the literature. Physical examination and laboratory data revealed no specific abnormalities. A CT scan demonstrated multiple calcifications throughout the pancreas, with a cystic mass in the tail of the pancreas involving the spleen. Endoscopic retrograde cholangiopancreatography (ERCP) revealed a dilated main pancreatic duct with a direct communication to the cyst. Distal pancreatectomy with splenectomy was performed on a diagnosis of pancreatic pseudocyst. The 10 x 9.5 x 7 cm in size cyst had no epithelial lining on its wall. The amylase level in the cystic fluid was 23424 IU/l. The literature reveals that hemorrhagic complications are common and often serious. Timely surgical intervention is advocated to reduce mortality and morbidity from complications.

Humans↗
PubMed1988

[Accumulating patterns of lipiodol and therapeutic effect of combination therapy with ADMOS and CDDP two-route infusion in hepatocellular carcinoma].

In 23 patients with hepatocellular carcinoma, accumulating patterns of Lipiodol on CT and therapeutic effects in combination therapy with adriamycin/mitomycin C-oil suspension (ADMOS) and Cis-diamminedichloroplatinum II (CDDP)two-route infusion were evaluated. Spotty-patterned tumors larger than 5 cm (8 cases) had a better response to the therapy in comparison with spotty-patterned tumors less than 5 cm (4 cases) and diffuse-type tumors (11 cases).

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1988

Detection thresholds of nonocclusive intestinal hypoperfusion by Doppler ultrasound, photoplethysmography, and fluorescein.

Because clinical assessment of bowel viability is unreliable, other methods of determining intestinal perfusion have been recommended. Since none of these quantifies intestinal blood flow, we measured flow at the detection thresholds of Doppler ultrasound, photoplethysmography, and intravenously administered fluorescein, perfused the intestines at these threshold levels, and assessed histologic evidence of ischemic damage. The intestines of five anesthetized dogs were perfused for 4 hours via an in-line pulsatile extra-corporeal circuit assembled between the iliac and superior mesenteric arteries at either relatively physiologic (approximately 20 ml/min/kg body weight) levels or reduced levels representing the flow detection thresholds of Doppler ultrasound or photoplethysmographic probes (approximately 4 ml/min/kg). Intravenously administered fluorescein was detected at even lower perfusion levels (approximately 2.1 ml/min/kg). Clear-cut ischemic changes were documented histologically in all subjects perfused at Doppler/PPG flow detection thresholds but in none of those perfused at normal levels. We conclude that threshold blood flow detection by any one of these methods, especially fluorescein, occurs at levels inadequate to guarantee tissue viability.

Animals↗
PubMed1988

Effect of glycerol treatment on pulmonary lipid metabolism in mice.

In this study, we demonstrated that glycerol treatment caused the alterations of pulmonary lipid compositions in ddY mice. The increases of total phospholipid (TPL), diacylglyceride (DG), phosphatidylcholine (PC) and phosphatidylethanolamine (PE) + phosphatidylglycerol (PG) contents in the lung were observed by oral administration of 5% glycerol in drinking water for 2 weeks. However, other pulmonary lipid components measured in this study were almost unchanged by this treatment. These results suggest that glycerol treatment might induce changes of pulmonary lipid metabolism in mice.

Animals↗
PubMed1988

Fibronectin enhances respiratory burst of phagocytes stimulated by zymosan and immune complexes.

Plasma fibronectin (FN) has been demonstrated to serve as an opsonin involved in the ingestion of foreign particles by phagocytes. This study concerns the effect of FN exposure on the respiratory burst of normal human peripheral phagocytes, using a luminol-dependent chemiluminescence (CL) assay for measurement of reactive oxygen metabolites generated. FN enhanced, in a dose-dependent manner, the CL response of circulating monocytes stimulated, probably via beta-glucan receptor, with unopsonized zymosan. FN also increased the CL response of phagocytes to fresh serum-opsonized zymosan. When we used a glycolipid (ceramide pentasaccharide, CPS) incorporated on liposome membranes as an antigen, the immune complexes prepared between CPS and human IgG (as antibody) did not induce a CL response, differing from previous reports. Addition of FN to the immune complexes significantly enhanced the CL response of phagocytes. The role of FN in host defence is discussed.

Antigen-Antibody Complex↗
PubMed1988

The mechanism of carbon tetrachloride induced pulmonary Clara cell damage: biochemical and morphologic studies.

In our present study, we have shown the different damages among pulmonary drug metabolizing systems and selective lesions of the pulmonary Clara cells in mice treated with carbon tetrachloride. Concerning with the inhibition degrees of pulmonary drug metabolizing systems, the inhibition of coumarin hydroxylase activity was the severest in this experiment. Moreover, at the in vitro carbon tetrachloride exposure study to estimate carbon tetrachloride metabolizing capacity, the severe degradation of coumarin hydroxylase activity was observed, while 7-ethoxycoumarin o-deethylase and NADPH-cytochrome c reductase activities only showed slight degradations by carbon tetrachloride treatment. From these results, it is suggested that cytochrome P-450 form which catalyzes coumarin hydroxylation may highly localize in the Clara cell and have carbon tetrachloride metabolizing activity.

Animals↗