Sodium n-butyrate causes reversible decrease in condensed chromatin clumps in HeLa cells.
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Butyrates↗
Biomedical subjects
T S Tralka
Publications and source records attributed to T S Tralka.
Ultrastructural concomitants of sodium butyrate-enhanced ectopic production of chorionic gonadotropin and its alpha subunit human bronchogenic carcinoma (ChaGo) cells.
Sodium butyrate treatment of cultures of ChaGo (human lung cancer) cells resulted in increased production of human chorionic gonadotropin (hCG) and its alpha subunit (hCG-alpha) and induced a variety of morphologic changes. Elongation and flattening of cells were seen by light microscopy. Immunocytochemistry with antisera against hCG and against hCG-alpha showed an increase in cells containing stainable hCG-alpha. Scanning electron microscopy demonstrated enhanced adhesion of cells to glass cover slips, with elongation, flattening, and decreased cytoplasmic blebs. Ultrastructural changes were examined by transmission electron microscopy and evaluated quantitatively by an unbiased observer. Significant findings included increases in perinuclear tonofilaments, smooth endoplasmic reticulum vesicles, dense mitochondrial inclusions, and lipid granules, as well as decreases in intercellular desmosomes, free polyribosomes, mitochondrial dense granules, and Golgi complexes. The most notable change, a marked decrease in condensed chromatin clumps, may have reflected a butyrate-induced biochemical modification of chromatin leading to enhanced accessibility of certain genes for transcription.
Butyrates↗
Properties of the cell surface Fc-receptor induced by herpes simplex virus.
Detection of peroxidase-antiperoxidase soluble complexes (PAP) bound to the surface of herpes simplex virus-infected cells has been used to demonstrate virus-induced Fc receptors and to study their distribution. The PAP method is more sensitive than hemadsorption with immunoglobulin-coated sheep red blood cells, and can be used to study localization by light and electron microscopy. Our results indicate that capping takes place after the receptor is engaged by antigen-antibody complexes and that at least a portion of the bound ligand is internalized.
Animals↗
Establishment and characterization of three new continuous cell lines derived from human breast carcinomas.
Three continuous lines of mammary tumor cells (ZR-75-1, ZR-75-27, and ZR-75-30) have been established from malignant effusions of two women with breast cancer. Differentiated properties expressed by each cell line include: (a) epithelial morphology (by light and electron microscopy) resembling that of the parental tumors; (b) presence of receptors for estrogen and other steroid hormones; and (c) growth responsiveness to estrogen and/or progesterone. All three cell lines possess human karyotypes that differ from one another in modal chromosome number as well as in characteristic marker chromosomes. Two of the cultures (ZR-75-27 and ZR-75-30), although derived from the same patient, have stable differences in their karyotypes.
Breast Neoplasms↗
Immunoglobulin binding to herpes virus-induced Fc receptors inhibits virus growth.
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Binding Sites, Antibody↗
Electron microscopic study of Herpesvirus saimiri.
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Capsid↗
Hexamethylene bisacetamide induces morphologic changes and increased synthesis of procollagen in cell line from glioblastoma multiforme.
Addition to hexamethylene bisacetamide (diacetyldiaminohexane) to cultures of a malignant mesenchymal cell line derived from a human glioblastoma multiforme induces morphological changes and stimulates the synthesis of procollagen. The morphological changes include cell elongation, an increase of extracellular material with staining properties of collagen by light microscopy, and an increase in extracellular 220-A fibrils by electron microscopy. The rate of procollagen synthesis increased as much as 20-fold, and the ratio of type I:type III procollagen changed, with type I becoming the predominant form. The change in type I:type III ratio is similar to that seen in the maturation of normal fetal to adult connective tissue.
Acetamides↗
Spontaneous lymphosarcoma arising in a nude mouse: characterization in vivo and in vitro.
A lymphosarcoma spontaneously arising in a nude mouse and a continuous cell line (NML-1) derived from it are described and compared. The primary tumor and a transplantable tumor line from it were composed of lymphoid cells, with no C-type viral particles seen by electron microscopy. The culture line was composed of cells with morphologic and functional properties of macrophages; budding C-type particles were abundant. The cells in the tumors produced in nude mice by injection of the NML-1 cells also resembled macrophages morphologically rather than lymphocytes; however, by electron microscopy, no C-type particles were seen. The findings suggest some type of in vivo suppression of complete expression of the virus.
Animals↗
Lamella-particle complexes in nuclei of owl monkey kidney cells infected with herpesvirus saimiri.
A complex consisting of ribosome-like particles and a striated lamella occurring in stacked, tubular, and twisted ribbon-like configurations was observed in the nuclei of confluent monolayer cultures of primary owl monkey kidney cells infected with Herpesvirus saimiri. They were similar to the cytoplasmic cylindroid structures seen in some human leukemias and in the lymphoma of the northern pike.
Animals↗
Maintenance of ectopic chorionic gonadotropin and alpha subunit secretion by a human lung cancer cell line (ChaGo) transplanted into nude mice.
ChaGo cells, derived from a human primary carcinoma of the lung, were successfully transplanted into nude mice without any change in morphologic characteristics over four generations and with continued ectopic secretion of human chorionic gonadotropin (HCG) and HCG alpha subunit (HCG-alpha). The concentration of free HCG-alpha was 1,100-fold higher than that of complete HCG in the original ChaGo culture medium but only 35-fold higher in nude mouse plasma, possibly due to slower metabolic clearance of complete HCG. Tumor weights correlated with plasma HCG-alpha but not with HCG. Tumor-bearing mice had significantly heavier uteri than did control mice.
Animals↗
Hamster ependymomas produced by intracerebral inoculation of a human papovavirus (MMV).
Ependymomas were produced in 3 of 11 newborn hamsters inoculated intracerebrally with a human papovavirus (MMV) isolated from a malignant lymphoma of the brain of a child with Wiskott-Aldrich syndrome. One of the tumors was serially transplanted into weanling hamsters. Cells from the transplanted tumors and from cell cultures derived from these tumors contained an intranuclear "T" antigen that reacted with simian virus 40 T antibody.
Animals↗
Cilia formation in cultures of human lung cancer cells treated with dimethyl sulfoxide.
Cells from cultures of the ChaGo line of human lung cancer were examined periodically by electron microscopy for 4 years and no cilia were observed. However, when cells were grown in medium containing 2% dimethyl sulfoxide, as many as 50% of the cells had cilia with a 9+0 microtubular pattern.
Cells, Cultured↗
Functional activity of a gonadotrophin--producing human lung carcinoma after transplantation in nude mice.
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Animals↗
Electron microscopic observations on formation of pulmonary metastases.
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Animals↗
C-Type virus particles in a cell line from a lymphosarcoma of a nude mouse.
C-type virus particles were observed by electron microscopy in cultures of a cell line (NML-1) derived from a lymphosarcoma that arose spontaneously in a nude NIH outbred mouse. The presence of such particles indicated that human tumors heterotransplanted in nude mice might become contaminated with murine oncornaviruses.
Animals↗