Biomedical subjects

H Enzan

Publications and source records attributed to H Enzan.

At least 109 records · Page 6Linked to original sources

PubMed1992

The establishment of an interleukin-6-dependent myeloma cell line (FLAM-76) carrying t(11;14)(q13;q32) chromosome abnormality from an aggressive nonsecretory plasma cell leukemia.

A new myeloma cell line designated FLAM-76 was established from a patient with an aggressive nonsecretory plasma cell leukemia. The cell line exhibited morphologic features of flaming cells and contained an abundant eosinophilic cytoplasm with many dilated cisternae of rough endoplasmic reticulum. FLAM-76 cells were positive for cytoplasmic kappa (kapp)-type immunoglobulin but did not secrete it into the culture medium. The cells proliferated in the presence of exogenous interleukin-6 (IL-6) and more than 800 pg/ml of IL-6 was necessary for their continuous growth. The cells did not grow without IL-6, and they did not produce IL-6. Thus, the growth of FLAM-76 appeared to be regulated by the paracrine mechanism of IL-6. Alpha-interferon (alpha-IFN) inhibited the IL-6-dependent growth of FLAM-76 in doses greater than 1000 U/ml. FLAM-76 cells expressed CD38 (OKT10) and cell adhesion-associated antigens such as CD44 and CD54 (ICAM-1). Chromosome analysis revealed FLAM-76 to have a hypodiploid chromosome constitution with t(11;14)(q13;q32) abnormality, which frequently is seen in neoplasms of B-cell origin. Immunoglobulin (JH and Ck) gene rearrangement (but no BCL-1 gene rearrangement) was found in this cell line.

Aged↗

PubMed1992

Administration of interleukin-2 induces major histocompatibility complex class II expression on the biliary epithelial cells, possibly through endogenous interferon-gamma production.

In various organ-specific autoimmune diseases, aberrant expression of major histocompatibility complex class II antigens on each target epithelial cell has been reported. Some researchers have attempted to link this phenomenon to the antigen-presenting capacity and the induction of autoimmunity, whereas others think it might serve as a peripheral mechanism for the induction and the maintenance of self-tolerance in autoreactive T cells. In this study, we showed that intraperitoneal administration of interleukin-2 (1.2 x 10(6) IU/kg) to 4-wk-old male BALB/c mice for 35 consecutive days induced lymphocyte infiltration around bile ducts in the liver and major histocompatibility complex class II expression on biliary epithelial cells, which was immunoelectron microscopically confined to the luminal cell surface. Immunohistochemically, lymphocytes accumulating around bile ducts were mainly T cells, positive for CD3, L3T4 and H-2 class II molecules, and a few of them were positive for Lyt-2 and negative for immunoglobulin. Half of the infiltrates were positive for asialo GM1, and one-third was positive for interferon-gamma. Interferon-gamma-positive, L3T4-positive cells were detected in mirror sections. However, neither the destruction of biliary epithelial cells nor the presence of granulomas was observed. Autoantibodies were serologically undetectable. The existence of interferon-gamma-positive cells in the lesion and the fact that intravenous administration of anti-interferon-gamma twice a week completely inhibited the lymphocyte infiltration and the major histocompatibility complex class II expression on biliary epithelial cells suggested that these changes were induced through endogenous interferon-gamma production.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗

PubMed1992

Experimental study on Reye's syndrome: inhibitory effect of interferon alfa on acetylsalicylate-induced injury to rat liver mitochondria.

Viral infection and acetylsalicylate (ASA)-induced mitochondrial aberration have been reported to play important roles in the pathogenesis of Reye's syndrome. We report that increasing amounts of ASA (0 to 250 mumol/L) resulted in increases in state 4 respiration and decreases in state 3 respiration in rat liver mitochondria in vitro when using alpha-ketoglutarate and/or beta-hydroxybutyrate as respiratory substrates, but not when using succinate as substrate. Interferon alfa (IFN-alpha) (1.5 to 5 x 10(4)IU/mL, approximately 1/100 the therapeutic dosage for humans) and interleukin-1 (IL-1) (1.5 to 2 x 10(4)IU/mL, nearly equivalent to the therapeutic dosage) decreased the severity of the above effects via interaction with mitochondrial membranes. Interferon gamma (IFN-gamma) and interleukin-2 (IL-2) had no such protective effect. Electron microscopic observation indicated that IFN-alpha prevented the induction of mitochondrial swelling by ASA. These results suggest that IFN-alpha may prove to be effective for the treatment of Reye's syndrome.

Animals↗

PubMed1992

Acute megakaryoblastic leukemia: establishment of a new cell line (MKPL-1) in vitro and in vivo.

A megakaryoblastic cell line (MKPL-1) was newly established from the bone marrow of an adult patient with acute megakaryoblastic leukemia. This cell line grew in single cell suspension with a doubling time of 30 h and consisted of large primitive blasts with persistent development of giant cells carrying multilobed nuclei. MKPL-1 cells were positive for platelet GPIIb/IIIa (CD41) and GPIIIa (CD61), and expressed OKM5 (CD36), MY7 (CD13), and MY9 (CD33) antigens in the absence of erythroid and lymphoid markers. The cytochemical and morphologic characteristics of MKPL-1 were also consistent with those of megakaryoblasts. The cells did not, however, express ultrastructural platelet peroxidase which is considered to be another marker of the megakaryocytic lineage. Cytogenetic analysis of MKPL-1 revealed a model chromosome number of 92 with abnormal chromosomes including those found in the patient's bone marrow cells. Furthermore, MKPL-1 cells were serially transplanted into nude mice for nine passages with production of lethal tumors and leukemic manifestation. Thus, our megakaryoblastic cell line which can be maintained both in vitro and in vivo would be useful for further studies of the biology of megakaryopoiesis and megakaryoblastic leukemia.

Aged↗

PubMed1991

Immunoelectron microscopic identification of asialo GM1-positive cells in adult rat liver.

For the electron microscopic identification of asialo GM1-positive cells, fresh-frozen sections fixed with cold acetone and PLP-fixed vibratome sections of adult rat livers were prepared immunocytochemically using the avidin-biotin-peroxidase complex method. Asialo GM1-positive cells were located mainly in the sinusoids, and rarely in Glisson's sheath and portal veins. In the sinusoids, most pit cells, showing the ultrastructural characteristics of large granular lymphocytes (LGL), were positive for asialo GM1 but a few pit cells were asialo GM1-negative. There were several, morphological differences between asialo GM1-positive and -negative pit cells. The asialo GM1-negative pit cells were smaller and had less-developed cell organelles and fewer dense granules, suggesting a more immature stage of development. Almost all the monocytes, segmented neutrophils and eosinophils, and small or large lymphocytes in the sinusoids also showed positive reaction for asialo GM1. In Glisson's sheath, in addition to pit cells and lymphocytes, mast cells were also positive for asialo GM1. In contrast, fixed cells such as liver parenchymal cells, endothelial cells, Kupffer cells and Ito cells within the liver lobules, as well as biliary epithelial cells, smooth muscle cells, fibroblasts, endothelial cells and pericytes in Glisson's sheath were all negative for asialo GM1. Thus, cell surface asialo GM1 expression is not specific for pit cells (LGL) in the rat liver.

Animals↗

PubMed1991

A biliary protein identified by immunoblotting stimulates proliferation of peripheral blood T lymphocytes in primary biliary cirrhosis.

The source of activation of T lymphocytes in primary biliary cirrhosis (PBC) is undefined. Hence, T-cell-mediated reactivity against a biliary tract antigenic protein from human bile was studied. The bile protein was fractionated by 30-50% saturated ammonium sulphate and gel-chromatography, and analysed by SDS-PAGE and Western immunoblotting using rabbit antisera to the bile protein. The antisera reacted specifically with human bile duct epithelium. Western blotting of bile proteins showed two major bands, the B1 and B2 antigens. B1 stained for sialoglycoprotein but not lipid, but B2 was negative for both. Cell-mediated reactivity was tested by proliferation of peripheral lymphocytes against B1. Taking the upper limit of the normal range for stimulation indices (S.I.) as less than 1.89 (= mean + 2 SD), a mitogenic response was detected in 14 of 16 patients with PBC (S.I.: 11.7 to 2.3), and in 4 of 15 patients with chronic active hepatitis, but in none of 12 patients with drug-induced intrahepatic cholestasis or obstructive jaundice. The B2 protein was non-stimulatory. Lymphocyte proliferation to B1 in PBC was confined to T cell fractions of peripheral blood leucocytes. There was no cross-antigenicity between B1 and the M2 antigens, according to Western blotting using the rabbit antisera and PBC sera with anti-M2 reactivity. Thus, the B1 biliary protein is a possible source of T cell activation in PBC and hence could be an immunological co-factor in the pathogenesis of this disease.

Aged↗

PubMed1991

[Ossifying fibroma in the cranial vault. Case report].

Ossifying fibroma is relatively common in the maxilla, but rare in the cranial vault. A 10-year-old girl was referred for painful swelling of the left temporal region. On admission, she presented no abnormal physical and neurological findings except for the painful swelling. Plain skull X-ray films showed a radiolucent lesion of the left temporal bone about 4 cm in diameter, with a hyperostotic area of the parietal side. Computed tomography scan using bone window level also showed an abnormal density lesion in the same site. Curettage of this tumor was performed from a cosmetic point of view and at the family's petition. Histological examination showed vascular fibrous tissue in which lamellar bone was surrounded by osteoblasts.

Child↗

PubMed1990

Liver-derived high density lymphocytes as a new member of resident cells in mouse liver.

Pit cells, which are recovered in low density fraction of lymphocytes derived from the liver (L-Fr.1,2), are recognized as perisinusoidal cells. In the present study, the accumulation of liver-derived low (L-Fr.1,2) and high (L-Fr.3,4) density 51Cr-labeled lymphocytes was assessed in the liver, spleen and peripheral blood of syngeneic BALB/c mice in comparison with those derived from the spleen (S-Fr.1,2 and S-Fr.3,4) and peripheral blood (P-Fr.1,2 and P-Fr.3,4). L-Fr.1,2, L-Fr.3,4 and P-Fr.1,2 accumulated selectively in the liver, whereas P-Fr.3,4 did not accumulate in the liver. L-Fr.3,4 was composed of two major subpopulations; Thy1+CD4+ and Thy1+CD8+. This suggested that L-Fr.3,4 were distinctive from P-Fr.3,4 or L-Fr.1,2 and inhabited the liver. P-Fr.1,2 and S-Fr.1,2 tended to accumulate in the liver and 51Cr labeled P-Fr.1,2 and S-Fr.1,2 were recovered mainly in L-Fr.1,2 L-Fr.3,4, S-Fr.1,2 and P-Fr.3,4 48 h after the transfer of these cells, suggesting that a part of P-Fr.1,2 and S-Fr.1,2 might be in dynamic equilibrium with those of L-Fr.1,2 and could be a part of the source of L-Fr.3,4. Results also suggested that some of L-Fr.1,2 of T cell lineage might change into L-Fr.3,4 in the liver and might be released into the systemic circulation. Thereafter, L-Fr.3,4 might behave as P-Fr.3,4 and no longer show organ-specific accumulation.

Animals↗

PubMed1989

Ontogeny of S-100 protein-positive histiocytes and lymphocytes in the human fetal lymphoreticular system.

In the human lymphoreticular system, the alpha and beta subunits of S-100 protein are found in ordinary monocyte-macrophages and non-phagocytic histiocytes such as Langerhans cells and interdigitating reticulum cells, respectively. The beta subunit is also present in some CD8+ T cells. In the present study, we investigated the ontogeny of these histiocytes and lymphocytes in humans. Yolk sacs and 4 to 21-week fetuses were examined immunohistochemically for the presence of S-100 protein subunits using antisera monospecific to each subunit. S-100 alpha + macrophages were present in the yolk sacs and the hepatic sinusoids of the 4th week embryos prior to bone marrow hematopoiesis. These macrophages later appeared in other lymphoid organs when anlagen of these organs were formed. No S-100 beta + cells were found in the yolk sacs. S-100 beta+ histiocytes were first detected in the hepatic sinusoids of the 5th week embryo, and after the 8th week of gestation, they were distributed in other lymphoid organs. S-100 beta+ lymphocytes were not found in the liver. They were first detected in the thymus at the 12th week of gestation, and were subsequently distributed in other lymphoid organs. These results suggest that S-100 beta+ lymphocytes and histiocytes may belong to different cell lineages, and the former may not be the precursor of the latter.

Gestational Age↗

PubMed1989

[A case of focal nodular hyperplasia in the liver].

A case of focal nodular hyperplasia of the liver was reported, in which various diagnostic imaging modalities were performed. Hepatic colloid scan (SPECT) in this case shows typical focal accumulation in the lesion. Ultrasonic image shows a sharply demarcated hypoechoic lesion in the left lobe. But no significant informations of this tumor were obtained in the plain CT, CE-CT and angiography. Echo-guided biopsy was performed and focal cirrhotic finding in the lesion without liver cirrhosis was obtained.

Adult↗

PubMed1988

Generalized lymph node metastasis of early uterine cancer in an HTLV-I carrier.

Generalized lymphadenopathy due to metastases of keratinizing squamous cell carcinoma developed in a 68-year-old woman who was a carrier of human T-cell leukemia Type I (HTLV-I). On her 74th hospital day, she died of massive metastases of the superficial and deep-seated lymph nodes, thyroid, lungs, pleura, liver, spleen, pancreas, kidneys, and retroperitoneum. At autopsy, the primary tumor was found in the uterine cervix. The depth of stromal invasion was approximately 4.0 mm. Such an extensive dissemination usually does not occur in cervical cancer with this type of early stromal invasion. It is conceivable that the chronic HTLV-I infection compromised the immunosurveillance against cancer and accelerated progression of the disease in this patient.

Carrier State↗

PubMed1988

Immunohistochemical identification of Trichosporon beigelii in histologic section by immunoperoxidase method.

An indirect immunoperoxidase method capable of identifying an opportunistic fungus, Trichosporon beigelii, in formalin-fixed, paraffin-embedded tissue has been developed. The authors studied autopsy materials from 19 patients with various fungal infections, including 3 patients with disseminated T. beigelii infection, 8 patients with localized or systemic candidiasis, 4 patients with invasive aspergillosis, 2 patients with pulmonary mucormycosis, and 2 patients with systemic cryptococcosis. T. beigelii could be successfully visualized in tissue sections from all three patients with this infection and a patient with systemic candidiasis who was found to have concomitant infection by T. beigelii. The capsule of Cryptococcus neoformans was also stained, indicating the presence of cross-reactive antigen between T. beigelii and C. neoformans. C. neoformans-absorbed antiserum was reactive with T. beigelii but not with other fungi, including C. neoformans.

Antibodies, Fungal↗

PubMed1988

An unusual case of solid hamartoma in the liver.

An unusual case of solid hepatic hamartoma, which could not be correctly categorized under the WHO classification, is reported. The well defined, solid nodular lesion, arising in the anterior edge of the left hepatic lobe, was found in a 15-month-old female infant. The lesion was composed of irregularly shaped yellow islands of parenchyma and white-gray nodules of fibrous stroma of various sizes, which were intermingled revealing a mosaic pattern. Prominent bile ductal proliferation was observed histologically in the fibrous stroma, associated in parts with dense or loose periductal bundles and vascular proliferation. The stromal proliferation seemed to result in erosion of the islands of differentiated parenchymal cells with no regeneration. Alpha-fetoprotein was demonstrated immunohistologically in the parenchymal cells of the lesion. From these findings, the essential component of this solid hamartoma was thought to be markedly proliferating bile ducts associated with periductal fibrosis, resulting in a fibroadenomatous pattern.

Bile Ducts↗

PubMed1987

Protein synthesis in Ito cells (fat-storing cells) of cultured liver tissues from CCL4-treated mice. A light and electron microscopic autoradiographic study.

Small tissue blocks of livers obtained from normal and CCl4-treated mice were incubated in culture medium supplemented with 3H-leucine for one hour to observe the protein synthesis of Ito cells in acute carbon tetrachloride liver injury by a light and electron microscopic autoradiography. In normal mouse liver very few Ito cells are labeled with 3H-leucine. On the contrary, in acutely damaged mouse liver by a single intraperitoneal injection of CCl4, the Ito cells in the centrilobular zones where liver cells show marked degeneration and necrosis are densely labeled. No labeling, however occurs over the Ito cells in the intermediate and peripheral zones of the same liver lobules, where liver cells showed no cellular degeneration. These findings show that the Ito cells are inactive in 3H-leucine incorporation under physiological conditions. After acute liver cell injury the Ito cells located in the necrotic areas of liver cells are markedly activated for protein synthesis.

Animals↗

PubMed1986

Trichosporon beigelii pneumonia in a patient with malignant histiocytosis.

A 30-year-old previously healthy housewife presented with bilateral pulmonary infiltrates. She was treated with various antibiotics but died with disseminated intravascular coagulation. Cultures of tracheal aspirates obtained prior to her death yielded Trichosporon beigelii. Postmortem examination revealed T. beigelii pneumonia with fungal dissemination in other organs. In addition, many organs were found to be infiltrated with atypical mononuclear cells which exhibited cytochemical properties of histiocytes. It was considered, therefore, that T. beigelii pneumonia developed on the basis of underlying malignant histiocytosis. T. beigelii in her lung sections was fluorescently stained with rabbit antiserum to the fungus isolated from the patient. This is the first report of Trichosporon beigelii pneumonia associated with malignant histiocytosis.

Adult↗

PubMed1986

Electron microscopic studies of macrophages in early human yolk sacs.

Distribution and fine structure of macrophages were studied in 10 human embryos in the 6th and 7th week of gestation, 5.5 to 12 mm in crown-rump length. The yolk sac macrophages were found in the extravascular mesenchymal tissues and intravascular spaces long before the first appearance of bone marrow and lymphatic tissues in the embryos. In addition to the macrophages, the fibroblastic cells and the cells of erythropoietic series were also present in the extravascular space. The macrophages showed a variety of cellular structures suggesting transition from immature cell type with no heterophagolysosomes to mature cell type in phagocytosis. The mature macrophages avidly phagocytized the primitive erythroblasts and occasionally platelets. They were positively stained for lysosomal enzymes and were characterized by numerous pleomorphic heterophagolysosomes which exhibited various stages of digestion of phagocytized blood cells. The origin of intravascular macrophages may be in either migrated extravascular macrophages or phagocytic endothelial cells. The phagocytosis and degradation of erythroblasts appear to be one of the main functions of yolk sac macrophages. The presence of the macrophages in mitosis indicates their proliferation in situ.

Embryo, Mammalian↗

PubMed1985

Nuclear chromatin condensation of mouse lymphoma (L-1210) cells by methylnitrosourea. An electron microscopic and biochemical study.

When the mouse lymphoma (L-1210) cells are treated with methylnitrosourea (MNU) at 37 degrees C for 30 min and then cultured for 4 h in a normal medium nuclear structure and functions of the cells are changed. We have investigated the mechanism as to how nuclear structure and functions are changed by MNU. In MNU-treated cells euchromatin area diminishes and chromatin condensation occurs. [3H]thymidine and [3H]uridine uptakes of the MNU-treated cells decrease. In contrast, when the MNU-treated cells are cultured in the presence of 3-aminobenzamide, a specific inhibitor of poly(ADP-ribose) synthetase changes of nuclear structure do not appear. [3H]Thymidine and [3H]uridine uptakes are partially and almost completely recovered, respectively. Autoradiographs of the cells labelled with [3H]NAD, a substrate of poly(ADP-ribose) synthetase show that silver grains due to [3H]ADP-ribose are densely located only in the cells where chromatin condensation occurs. Chromatin-bound proteins of molecular masses 20-25 X 10(3) daltons are specifically poly(ADP-ribosyl)ated in the MNU-treated cells. These results suggest that MNU-induced chromatin condensation is caused by poly(ADP-ribosyl)ation of chromatinbound proteins.

Animals↗

PubMed1985

Proliferation of Ito cells (fat-storing cells) in acute carbon tetrachloride liver injury. A light and electron microscopic autoradiographic study.

The proliferative activity of Ito cells in acute liver injury induced by carbon tetrachloride (CCl4) was studied by light and electron microscopic autoradiography. At 48 hours after a single intraperitoneal injection of CCl4, the livers of the mice given vitamin A per os for preceding 9 days and those of the mice without vitamin A-pretreatment were removed. Small tissue blocks of each group were respectively incubated at 37 degrees C for 1 hour in culture medium containing 3H-thymidine. After CCl4 injection, perisinusoidal and sinusoidal cells adjacent to centrilobular necrotic liver cells increased in number and size. Some of them were labelled by 3H-thymidine. On the other hand, the perisinusoidal and sinusoidal cells in the peripheral zone in which liver cells are not markedly degenerated nor necrotic showed no noticeable increase in number. They contained very few or no silver grains after 3H-thymidine. In control mice the labelling of perisinusoidal cells was hardly observed. Electron microscopic autoradiography revealed that most of the labelled perisinusoidal cells in the centrilobular zone possess characteristics of Ito cells in their location and in the fine structures such as the presence of small fat droplets, well-developed rough endoplasmic reticulum, and Golgi complex in the cytoplasm. These findings indicate that Ito cells incorporate 3H-thymidine in DNA synthesis after hepatocellular necrosis resulting in cell proliferation.

Animals↗