Biomedical subjects

A Hizuta

Publications and source records attributed to A Hizuta.

63 records · Page 4Linked to original sources

PubMed1985

[Effect of human recombinant beta-interferon on natural killer activity of peripheral lymphocytes in cancer patients].

After human recombinant beta-interferon (ReIFN-beta) was administered to 13 cancer patients intrathoracoperitoneally and by intravenous drip infusion every day or 3 times a week, the effect of peripheral lymphocytes on natural killer (NK) activity was studied. When ReIFN-beta was given every day or 3 times a week, the NK activity was notably enforced, and was maintained throughout the period of administration. NK activity was also enforced regardless of whether ReIFN-beta was given intravenously on intrathoracoperitoneally. By the administration of ReIFN-beta, pleural effusion and ascites in three patients were depleted, and in one patient, Douglas' cul-de-sac tumor disappeared. It was therefore suggested that ReIFN-beta was effective against the cavity of carcinomatosis.

Adult↗

PubMed1983

Inhibition of human natural killer (NK) activity and antibody dependent cellular cytotoxicity (ADCC) by lipomodulin, a phospholipase inhibitory protein.

A highly purified preparation of lipomodulin, a phospholipase-inhibitory protein from rabbit neutrophils treated with glucocorticoids, inhibited NK and antibody-dependent cellular cytotoxicity (ADCC) activities of human peripheral blood lymphocytes in a dose-dependent manner. The presence of lipomodulin during the early period of the cytotoxicity assay was necessary to obtain maximal inhibition. The inhibition of NK or ADCC activity by lipomodulin was greater when effector cells were treated with lipomodulin than when target cells were incubated with lipomodulin. As lipomodulin did not block binding of effector cells to target cells, our results suggest that lipomodulin inhibits the cytolytic phase of NK and ADCC activities after binding to target cells, and imply that phospholipase(s) may be involved in NK and ADCC activities.

Annexins↗

PubMed1981

Concomitant presence of anti-tumor effector cells and suppressor cells in the spleen of tumor-bearing mice : the nature of suppressor cells.

In order to investigate the immunological responsiveness of tumor-bearing hosts to tumor cells, splenic suppressor cells from Ehrlich tumor-bearing mice that inhibited anti-tumor effector cell activity were characterized. In vitro cell-mediated cytoxicity and cytostasis assays were performed to test for the existence of anti-tumor immunity. suppressive activity assayed by cell mixture experiments became apparent with decline of anti-tumor immunity and progressive tumor growth. The cells mediating the suppression were found to be nylon wool column adherent T cells and inhibited T cell dependent cytotoxicity rather than non-T cell dependent cytostasis. In vivo cell transfer experiments demonstrated that intravenous injection of suppressor cells to a host already inoculated with tumor cells mixed with antitumor effector cells resulted in significant enhancement of tumor growth. This inhibition of in vivo neutralization assay be suppressor cells was found in not only allogeneic but also syngeneic tumor system. Splenectomy at the time of tumor resection endowed the host with stronger resistance against subsequent reinoculated tumor than sham-splenectomy did, reflected by prolonged survival times. These results suggest that splenectomy combined with surgical removal of the tumor is a useful treatment of clinical malignancies.

Animals↗

PubMedDate not supplied

Functional expression of Fas and Fas ligand on human colonic intraepithelial T lymphocytes.

The expression of Fas, a cell surface receptor directly responsible for triggering cell death by apoptosis, and its ligand (FasL) was investigated on both human colonic intraepithelial T lymphocytes (IELs) and peripheral blood mononuclear lymphocytes (PBMLs). FACS analysis indicated that IELs have increased expression of Fas compared with PBMLs, together with the progress activation marker, CD45RO. A discrete fraction of freshly isolated IELs also constitutively expressed FasL, perhaps as a result of recent in vivo activation. Using monoclonal antibody APO2.7, which detects mitochondrial 7A6 antigen specifically expressed by cells undergoing apoptosis, we further investigated the apoptosis-inducing effect of anti-Fas monoclonal antibody (CH11) on both IELs and PBMLs. FACS analysis revealed that CH11 increased the percentage of apoptotic cells, in IELs but not in PBMLs. Culture with anti-FasL monoclonal antibody (4H9) significantly recovered cell viability in IELs, but not in PBMLs. These results indicate that IELs constitutively express both Fas and FasL and that Fas crosslinking generates signals resulting in apoptosis, outlining a potential mechanism involved in intestinal tolerance.

Adult↗

PubMedDate not supplied

Metachronous liver metastasis of colorectal cancer: timing of occurrence and efficacy of adjuvant portal chemotherapy.

We estimated the time of occurrence of metachronous liver metastasis in colorectal cancer patients from tumor diameter and doubling time. Micro-metastasis was present prior to operation in most patients and a few metastatic cases could have been initiated by the surgical procedure. Portal chemotherapy is more effective against liver metastasis than intravenous infusion because a higher drug concentration in the liver can be obtained. This efficacy of portal chemotherapy on survival was also observed in a rat model. Thus perioperative adjuvant treatment should be undertaken for metastasis which already existed before the operation and adjuvant chemotherapy via portal vein is the treatment of choice. The no touch isolation technique is also needed to avoid spreading of tumor cells during surgery.

Animals↗

PubMedDate not supplied

Colorectal cancer after irradiation for cervical cancer--case reports.

Three patients with colorectal cancer after irradiation for cervical cancer are described. One patient had two colorectal cancers. Three of the four cancers in these patients were located in the rectum and one in the sigmoid colon; all were within the irradiation field. Microscopic radiation proctocolitis was observed in all specimens. The interval between irradiation and the diagnosis of colorectal cancer was 20-24 years. It is important to consider patients who have undergone pelvic irradiation as being in a high risk group for the development of colorectal cancer. Close and long-term surveillance may be useful in these patients.

Adenocarcinoma↗

PubMedDate not supplied

Five primary cancers in one patient.

We report a 62-year-old man with five primary cancers. He underwent nephrectomy for a right renal cell carcinoma and removal of malignant meningioma and 6 years later was diagnosed as having a rectal cancer and hepatocellular carcinoma. He died of respiratory failure and a gastric cancer was found at autopsy.

Adenocarcinoma↗

PubMedDate not supplied

Complete regression of advanced liposarcoma of the anterior chest wall with interferon-alpha and tumor necrosis factor-alpha.

This paper reports a case of complete regression of a liposarcoma in a 62-year-old Japanese man who, in August 1986, presented with a giant subcutaneous tumor of the right anterior chest wall. Local radiotherapy and conventional chemotherapy were initially performed; however, the tumor did not respond at all. He then received cytokine treatment (interferon-alpha and tumor necrosis factor-alpha). Nineteen months after cytokine treatment, the mass disappeared totally. The patient has been in complete remission for five years without recurrence and with no additional treatment. This suggests that the use of interferon-alpha and tumor necrosis factor-alpha in combination may be an effective and promising modality for liposarcomas which are refractory to the conventional anticancer treatments.

Antineoplastic Combined Chemotherapy Protocols↗

PubMedDate not supplied

Penile metastasis secondary to cecum carcinoma: a case report.

To date, only around 300 cases of metastasis to the penis have been reported and the primary cancer has been generally found in genitourinary structures. However, exceptional cases in which the primary site has been situated in organs like esophagus, pancreas, stomach have been published. We report an uncommon case in which the primary tumor was located in the cecum. To our knowledge, this is the first case of penile metastasis in which the responsible tumor was located in the cecum and in which the mode of metastasis was not direct invasion. As the tumor was restricted to the colon wall without invasion to neighbouring structures, and because colon cancer follows mainly the lymph-vascular route to its dissemination, this route is the most likely mode of the spread. By magnetic resonance imaging (MRI) on penile shaft, multiple nodules were clearly visualized. Nevertheless, as in most cases, in spite of the availability of advanced and precise diagnostic methods, the information was of little value for the patient. His survival was short.

Adenocarcinoma↗