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Biomedical subjects

T Katsuki

Publications and source records attributed to T Katsuki.

At least 127 records · Page 7Linked to original sources
PubMed1987

Establishment and characterization of a human pancreatic cancer cell line (SUIT-2) producing carcinoembryonic antigen and carbohydrate antigen 19-9.

A new tumor cell line (SUIT-2) derived from a metastatic liver tumor of human pancreatic carcinoma has been established in tissue culture and in nude mice, and maintained for over five years. In tissue culture, the cells grew in a monolayered sheet with a population doubling time of about 38.2 hr, and floated or piled up to form small buds above the monolayered surface in relatively confluent cultures. Chromosome counts ranged from 34 to 176 with a modal number of 45. Subcutaneous injection of cultured cells into nude mice resulted in tumor formation, histopathologically closely resembling the original neoplasm which had been classified as moderately differentiated tubular adenocarcinoma. Electron microscopic observation of the neoplastic cells revealed a characteristic pancreatic ductal epithelium. SUIT-2 cell line produces and releases at least two tumor markers, carcinoembryonic antigen and carbohydrate antigen 19-9, propagates even in serum-free medium, and metastasizes to the regional lymph nodes in nude mice xenografts.

Aged↗
PubMed1987

Combined therapy for esophageal varices: sclerotherapy, embolization, and splenopneumopexy.

A new approach consisting of sclerotherapy, embolization, and splenopneumopexy was designed to treat esophageal varices, which were caused by cirrhosis of the liver in 13 patients and by idiopathic portal hypertension in three. No serious complications occurred. Fifteen of the patients were well and without recurrent bleeding or encephalopathy during the 29-month follow-up period. One patient died of hepatic failure 4 months postoperatively. The varices either disappeared or were significantly improved. Placement of a portopulmonary shunt by splenopneumopexy is a safe, simple, and effective procedure for the resolution of varices that recur following sclerotherapy.

Aged↗
PubMed1986

Primary perianal actinomycosis over a thirty year period.

A 50-year-old Japanese man had had abscesses and draining fistulas in the perianal region. These lesions recurred, despite surgical treatment such as incision and drainage over a 30 year period. "Sulfur granules" were found in the pus from the abscess and Actinomyces israelii was cultured. Ampicillin-cloxacillin treatment lead to healing. The patient died 4 months later with a hepatoma and multiple metastases.

Abscess↗
PubMed1986

Degradation of protease inhibitors, immunoglobulins, and other serum proteins by Serratia protease and its toxicity to fibroblast in culture.

We investigated the effect of the extracellular protease of Serratia marcescens on human serum constituents such as immunoglobulins, fibronectin, alpha 1-protease inhibitor, alpha 2-macroglobulin, lysozyme, and transferrin. At a very low concentration of Serratia 56-kilodalton protease (56K protease), purified human plasma fibronectin was degraded rapidly into three structural domains or small fragments. Immunoglobulin G3 (IgG3) and IgA1 were also degraded within 30 min with 1 microgram of this protease per ml, more rapidly than their other subclass of IgG or IgA. alpha 1-Protease inhibitor, which did not inhibit the 56K protease, was degraded similarly by the protease. These events were demonstrated by fluorescence polarization and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The protease was considerably inhibited by human alpha 2-macroglobulin and chicken ovomacroglobulin. However, when there was a 2 M excess of ovomacroglobulin or a 4 M excess of alpha 2-macroglobulin over the 56K protease, about 25 or 40% proteolytic activity remained, respectively. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that the protease degraded the alpha 2-macroglobulin extensively during prolonged incubation, which paralleled with regeneration of the protease activity. The protease also cleaved human lysozyme, although moderately. Human serum transferrin was degraded slightly, and human serum albumin was almost resistant to the 56K protease. The enzyme seemed to have no effect on reconstituted collagen, but it degraded rat tropocollagen and yielded fragments of beta and gamma chains by cleaving the intramolecular cross-links. Most of the above proteolysis by the 56K protease appears to result in a limited type of substrate specificity. Thus, the present study demonstrates that the protease is capable of degrading defense-oriented humoral proteins and tissue constituents. Furthermore, it is toxic to fibroblasts. These findings also clarified the possible role of Serratia protease as a virulence factor in the pathogenesis of serratial infections. We recently demonstrated this notion in vivo with rabbit cornea (R. Kamata et al., Ophthalmology 92:1452-1459, 1985).

Blood Proteins↗
PubMed1986

Impairment of T-cell control of Epstein-Barr virus infected B-cells in patients with adult T-cell leukemia.

The abilities of peripheral blood lymphocytes from 9 patients with adult T-cell leukemia (ATL) and 14 healthy control adults to cause regression of proliferating B-cell foci induced by Epstein-Barr virus (EBV) were examined. Marked regression of EBV-transformed B-cell foci was observed in lymphocytes from all 10 EBV-seropositive donors but with none of those of the 4 EBV-seronegative donors in the control group. The lymphocyte of all 9 patients with ATL, who were EBV-seropositive, caused little or no regression of B-cell foci like those of EBV-negative healthy donors. These results suggest that the absence of regression of EBV-induced B-cell proliferation observed in ATL patients is due to impairment of EBV-specific killer T-cell activities.

Adult↗
PubMed1985

Remarkable improvement of clinical status in a patient with multiple lymphomatous polyposis of the gastrointestinal tract after repetitive chemotherapy.

The effect of repeated courses of chemotherapy on gastrointestinal tumors seen in a 43 year-old male patient with multiple lymphomatous polyposis involving the entire gastrointestinal tract was presented. Numerous polypoid lesions from the stomach to the rectum were the characteristic finding in this case. The biopsied specimens from polyps either of the stomach or large intestine showed diffuse lymphocytic accumulation in the submucosa, which is consistent with multiple lymphomatous polyposis of the gastrointestinal tract. Remarkable regression of the large masses in the gastrointestinal tract was obtained by two courses of VEMP therapy, along with improvement of hypoalbuminemia and a positive CRP. Recurrence of gastrointestinal masses in the cecum and rectum was also eliminated by six courses of CHOP therapy, and a total of nine courses of CHOP therapy led to complete disappearance of masses in the gastrointestinal tract. The present case is different from the others in terms of the following viewpoints that first the ensuing large masses favorably responded to repetitive chemotherapy, secondly the histopathological findings remained benign despite the fact that large nodular masses had recurred in the cecum and rectum, and thirdly the pathological changes were still confined to the gastrointestinal tract without developing systemic malignant manifestations.

Adult↗
PubMed1985

Interleukin 2 acts directly on a Tac-positive cloned B cell line established from a patient with adult T cell leukemia.

A Tac-positive B cell line termed K3B was established from a patient with adult T cell leukemia (ATL). This cell line had EBNA antigen and human T cell leukemic virus (HTLV) provirus besides B1 antigen and surface immunoglobulin. A cloned Tac-positive B cell line termed K3B01 was obtained from K3B by the limiting dilution method. The K3B01 cells were shown to absorb IL 2 activity in a tonsillar IL 2 preparation. By using this cloned cell line and a purified recombinant IL 2 preparation, it was shown that the proliferation of K3B01 cells was enhanced by the addition of recombinant IL 2. Moreover, this response was inhibited by anti-Tac antibody. These results demonstrate definitively that IL 2 acts directly on B cells through IL 2 receptors on them.

Adult↗
PubMed1985

Natural cytostatic cells have a broader range of antitumor activity than natural killer cells.

Natural cytotoxic activity by Thy-1 negative, asialo-GM-1 positive and column-nonadherent spleen cells was detected against YAC-1 target cells but not against Meth-A and EL-4 target cells as reported by many investigators. In the present study, on the other hand, natural cytostatic activity was detected in Thy-1 negative, asialo-GM-1 negative and column-nonadherent cells and this activity was effective against YAC-1, Meth-A and EL-4 target cells. Such a cytostatic activity was not modified by the functional levels of T cells in the donor mice of effector cells. The cytostatic activity against Meth-A and EL-4 target cells was detected not only in an allogeneic system but also in a syngeneic system. The cytostatic activity was not depressed in a tumor-bearing state in contrast to the NK activity. The cytostatic activity as well as the NK activity was detected in spleen and peritoneal cells but not in lymph node cells of the various sources. The spleen and peritoneal cavity may play a role distinct from that of lymph nodes in the resistance against tumor development.

Animals↗