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Query: UMLS:C0027651 (tumor)
 685,946 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Tumor host resistance and promotion are multiple complex simultaneous phenomena. This paper relates only to the effect of ground substance viscosity on tumor host interaction. Tar, anthralin, ultraviolet light, x-ray and arsenic have been widely used to treat inflammatory skin disorders such as psoriasis. They are also well known carcinogens. It is proposed that both the anti-inflammatory effect and part of the carcinogenic effect could occur by decreasing ground substance viscosity and suppressing fibroblasts. Streptococcal infections, chloroquine and pyridoxine deficiency increase inflammatory skin disorders and are known to be beneficial to tumor resistance. It is proposed that both effects could occur because of their effect of increasing ground substance viscosity and, at least with streptococcal infections, by stimulating fibroblasts. Within certain limits, vitamin C has a stimulant effect on fibroblast and ground substance viscosity. Beta carotene is active in stimulating wound healing. Localized edema of the dermal papillae precedes granulocytic inflammation in disorders like psoriasis. Anything that decreases ground substance viscosity will prevent dilution of tissue fluids by decreasing localized edema and thus decrease formation of some mediators of inflammation. Anything that increases ground substance and its viscosity will promote local dilution of tissue fluid. Increasing dilution of tissue fluids promotes the formation of some mediators of inflammation. Tumors commonly secrete hyaluronidase. It is proposed that substances that decrease ground substance viscosity (hyaluronidase-like activity) encourage tumors and substances that increase ground substance viscosity (anti-hyaluronidase-like effect) increase resistance to tumors.
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PMID:Cancer resistance, carcinogenesis and ground substance viscosity. 363 77

A new human rhabdomyosarcoma cell strain, designated KYM-1, has been established from a neck tumor found in a 9-month-old infant. The cultured cells were round and mainly free-floating or in a moniliform pattern with a population doubling time of 75 hours. In stained preparations, the cells were pleomorphic and had a single round or oval nucleus in non-striated cytoplasm. However, the intracellular presence of myogenic markers was clearly shown by enzyme-immunochemical stains. An ultrastructural feature of the KYM-1 cells was the presence of numerous intermediate filaments in the perinuclear area and around the Golgi complexes which were associated with abundant cell organelles and aggregates of glycogen granules. High viscosity of the spent culture medium was attributed to hyaluronic acid, identified by electrophoresis and hyaluronidase digestion, and immunological and biochemical analyses revealed that the increased concentration of plasminogen activator activity found in the culture medium was almost wholly of the tissue plasminogen activator type. The KYM-1 cells also contained high concentrations of alkaline phosphatase activity. Tumorigenicity of the cells was confirmed by heterotransplantation into hamsters treated with anti-thymocyte serum.
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PMID:Characterization of a human rhabdomyosarcoma cell strain in tissue culture. 383 Feb 65

46 patients (17 myelomas, 11 malignant lymphomas, 8 mammary carcinomas, 7 head and neck carcinomas, 2 gastrointestinal carcinomas and 1 ovarian carcinoma) were treated with Permease prepared of bovine testes by Sanabo. 7500 i.u. were given either intramuscular one hour before cytostatic chemotherapy or intraperitoneally with cytostatic agents. There were 2 cases of local irritation on the site of injection and 1 case of reversible anaphylactoid reaction. Results achieved in patients treated with the same chemotherapy in spite of resistance, but with addition of Permease: myeloma CR 2/9, subjective improvement 7/9; 5 patients expired, median observation time: 13 months; non-Hodgkin-lymphomas CR 2/5, PR 2/5; 2 patients expired, median observation time: 9 months; breast cancer PR 2/4, 2 patients expired, median observation time: 5 months, 1 patient with Morbus Hodgkin CR, expired after 24 months. The other patients who received systemic treatment had either primary chemotherapy with addition of Permease, or chemotherapy was altered because of resistance against the prior therapy before Permease was applied. Intraperitoneal application of Permease together with cytostatic agents, usually not used for local therapy because of high rate of irritation like cis-platin, was well tolerated. Complete regression of ascites was achieved in all cases. In 1 of the 4 patients duration of remission was 7 months. Hypotheses concerning the mechanism of action of hyaluronidase in malignant diseases are discussed. The effectiveness of Permease might be related to resistance phenomenon of tumor cells or to alteration of pharmacokinetics of cytostatic agents.
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PMID:[Results of a pilot study of hyaluronidase as an adjunct to cytostatic therapy in malignant diseases]. 383 6

A clone of natural killer (NK) cells (JTB18) was found to be ultrastructurally similar to peripheral blood large granular lymphocytes (LGL). These cells incorporated [35S]sulfate into cell-associated proteoglycan molecules, which were then isolated by CsCl density gradient centrifugation. As assessed by gel filtration chromatography, the native 35S-labeled proteoglycan and its beta-eliminated 35S-labeled glycosaminoglycans were of Mr approximately 200,000 and 50,000, respectively. The 35S-labeled proteoglycans were resistant to proteolysis, since their Mr were apparently not altered by incubation with either pronase or S. aureus V8 protease. The purified NK cell 35S-labeled proteoglycans were degraded by approximately 90% to 35S-labeled disaccharides with either chondroitinase ABC or AC. High performance liquid chromatographic analysis of the digests revealed these disaccharides to be composed entirely of chondroitin sulfate A (glucuronic acid----N-acetylgalactosamine-4SO4). Whole 35S-labeled cells incubated with chondroitinase ABC failed to release 35S-labeled disaccharides into the supernatant, and x-ray energy-dispersive analysis revealed that sulfur-containing molecules were present in the intracellular granules, thereby localizing the NK cell-associated proteoglycan primarily in the granules of the cell, rather than on the plasma membrane. The 35S-labeled cloned NK cells incubated for 30 min to 4 h with K562 tumor cell targets at a 0.5:1 ratio exocytosed a mean of 49% of the granular 35S-labeled proteoglycans during the first 60 min of the culture. Proteoglycan release was maximal with an effector/target cell ratio of 0.5:1 for JTB18:K562. Significant proteoglycan release from JTB18 NK cells was also obtained with other sensitive target cells such as REX, Molt4, and CEM, but not with cells such as KG1 and Laz156, which have been shown previously to be resistant to killing by this NK cell. Thus, protease-resistant intracellular proteoglycans with chondroitin sulfate A side chains are specifically exocytosed from the granules of human NK effector cells upon contact with sensitive targets, suggesting that these proteoglycans may be involved in the mechanism of cytotoxicity.
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PMID:Proteoglycans in cell-mediated cytotoxicity. Identification, localization, and exocytosis of a chondroitin sulfate proteoglycan from human cloned natural killer cells during target cell lysis. 393 16

A method was developed for obtaining direct chromosome preparations from SENCAR mouse skin tumors induced by chemical carcinogenesis protocols. Papillomas and squamous cell carcinomas were mechanically dispersed immediately after resection and were placed in a modified Hanks' solution with collagenase, trypsin, hyaluronidase, bovine albumin, and Colcemid. Total exposure to Colcemid did not exceed 1 hr. Metaphases were obtained in 100% of the analyzed specimens, allowing chromosome counting screening for double minutes and, in 50% of the cases, useful G-banded slides. The technique described has produced, for this type of tumor, a higher number of successful G-banded preparations than other previously reported methods for solid tumors. This procedure may be applicable for the study of human solid tumors that are histologically similar to our murine model, such as squamous cell carcinoma of cervix or lung.
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PMID:A direct cytogenetic technique for mouse skin carcinomas and papillomas. 394 63

Twenty-three cases of intramuscular myxoma were analyzed clinically and histologically. The mean age of the patients was 54 years, and two-thirds were women. Clinical follow-up of 2 to 17 years' duration revealed no recurrences or metastases. Intramuscular myxoma thus appears to be a completely benign tumor. One patient simultaneously had a myxoma in the muscle of the thigh and a lesion of fibrous dysplasia in the femur. In addition, 14 of 16 patients studied with x-ray had a significantly higher incidence of minor abnormalities in bones as compared with the normal population. The myxomas were characterized histologically by sparse cellularity, abundant intercellular material digestible with hyaluronidase, and lack of mitotic figures. At the ultrastructural level, the tumor cells showed characteristics of fibroblasts and myofibroblasts. Immunohistochemical analysis of intermediate filament proteins revealed vimentin- but no desmin-positivity in the tumor cells, and endothelial cell markers as well as S-100 protein were absent. This is compatible with fibroblastic-myofibroblastic nature of the myxoma cells.
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PMID:Intramuscular myxoma--a clinicopathological study of twenty-three cases. 403 56

The murine monoclonal antibody (MAb) designated DF3 has defined a high m.w. antigen detectable in human breast carcinomas and in human milk. DF3 antigen is detectable on apical borders of secretory mammary epithelial cells and in the cytosol of less differentiated malignant cells. DF3 antigen expression has been shown to correlate with the degree of human breast tumor differentiation, and the detection of a cross-reactive species in human milk has suggested that DF3 antigen might be useful as a biochemical marker of differentiated mammary epithelial cells. To further characterize DF3 antigen, we have developed an approach to purify the cross-reactive species by using gel filtration and antibody affinity chromatography. The affinity column-purified DF3 antigen was absorbed by wheat germ agglutinin and peanut agglutinin, but not by concanavalin A or lentil lectin. In contrast, wheat germ agglutinin inhibited MAb DF3 reactivity with the purified antigen, whereas there was little, if any, inhibition when using peanut agglutinin. These findings are thus consistent with the involvement of terminal N-acetyl-D-neuraminic acid and/or N-acetylglucosamine residues in the antigenic site. DF3 antigenicity was also sensitive to neuraminidase, but not chondroitinase ABC, chondroitinase AC, chondroitin-4-sulfatase, or hyaluronidase. Furthermore, DF3 antigen was sensitive to Pronase, subtilisin BPN', and alpha-chymotrypsin. The presence of O-glycosidic linkages between carbohydrate and protein in the DF3 antigenic site was further supported by the presence of NaBH4-sensitive sites. Together, these results suggest that sialyl oligosaccharides present on a peptide backbone are required for maintaining DF3 antigenicity. Similar findings have been demonstrated for DF3 antigen purified from both human milk and breast cancer effusions. However, the DF3 antigen in human milk consisted of a single high m.w. species, whereas the tumor-associated antigen consisted of two distinct glycoproteins with m.w. of 330,000 and 450,000. These findings may be relevant to the recent demonstration that distinct high m.w. DF3 antigens are elevated in the circulation of patients with breast carcinoma.
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PMID:Purification and characterization of a high molecular weight glycoprotein detectable in human milk and breast carcinomas. 404 99

The lactic dehydrogenase agent was obtained in quantities sufficient for purification studies by growing the virus in Ehrlich ascites tumor-bearing mice. A rapid method of titration of the agent is described. Subsequent to the standard procedure of concentration of virus by treatment with hyaluronidase and centrifugation, lipids were removed by extraction with PE, without major loss of infectivity. Electron microscopic sections of purified preparations contained particles consisting of a dense inner ring of about 25 mmicro and a less dense ring extending to about 50 mmicro. The particles occur frequently in single-membraned vesicles of varying size, and occasionally in large double-membraned bodies. The purified LDH agent did not stimulate the formation of neutralizing antibodies in rabbits and guinea pigs. The crude LDH agent was found to be a low interferon producer. Increased interferon, produced by secondary inoculation with Newcastle disease virus temporarily decreased the titer of the LDH agent. The results of others regarding the nature and the size of the LDH agent are interpreted in regard to the findings presented, and the role of interferon in permanently LDH agent infected mice is discussed.
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PMID:Some properties of the lactic dehydrogenase agent of mice. 584 May 39

Cultured Y-l mouse adrenal tumor cells treated with ACTH (0.5 U/ml) rounded, formed filopodia and numerous thin microvilli, and produced steroids. Rounding, filopodia and bleb formation occurred for trypsin (0.01%), and hyaluronidase (0.1%), treated cells; but neither affected control or ACTH-stimulated steroidogenesis. Neuraminidase treatment (20 mU/ml) caused rounding, thin microvilli, bleb formation, slightly increased steroid production and prevented subsequent ACTH effects. Neuraminidase appeared to alter a carbohydrate-containing ACTH receptor preventing ACTH binding. We conclude rounding and steroidogenesis are not always associated.
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PMID:Rounding and steroidogenesis of enzyme- and ACTH-treated Y-l mouse adrenal tumor cells. 608 55

A transplantable rodent tumor producing multiple layers of basement membrane was used to study the effects of trypsin, hyaluronidase and collagenase on basement membranes. Treatment with trypsin resulted in an increase in the distance between adjacent lamellae and a loss of granular structures. Treatment with hyaluronidase separated basement membrane layers only in the outer lamellae, whereas collagenase resulted in extensively folded sheets which consisted predominantly of granules. From these findings it may be concluded that the granular structures represent the morphological equivalent of glycoproteins which are interlinked by a collagenous filamentous network. Hence, the BM represents a functional unit of proteoglycans, glycoproteins and collagen.
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PMID:Basement membrane alterations after treatment with trypsin, hyaluronidase or collagenase. 612 58


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