Switch to
| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
3
|
| pubmed:dateCreated |
1992-6-16
|
| pubmed:abstractText |
Previous work conducted by the authors, using a murine model, suggested that soluble factors secreted by tumor cells suppress lymphocyte responses. To apply this premise to human tumors, the effects of UC729-6 (lymphoblastoid B-cell) and M21-HPB (malignant melanoma) conditioned media (CM) on normal lymphocyte proliferation, as well as on tumor cell growth in autologous CM was studied. The CM was collected at 2-5 day intervals from cultures of UC729-6 and M21-HPB cells in serum-free media. Phytohemagglutinin- and concanavalin A-stimulated mononuclear peripheral blood cells from healthy human donors showed decreased [3H]thymidine ([3H]Tdr) uptake in the presence of each CM when compared with controls. In assays using 100% CM, mitogen stimulation was 68-85% less than that of controls and 40-50% less using 50% CM. The suppression was more pronounced with UC729-6 CM than with M21-HPB CM. In mixed lymphocyte cultures (MLC), addition of 50% CM from either tumor cell line resulted in 40-50% reduction in [3H]Tdr uptake by lymphocytes. Incubation of UC729-6 cells in 5% to 100% of UC729-6 fCM (filter-concentrated) produced a decrease in [3H]Tdr uptake which was directly proportional to the amount of fCM present. In contrast, M21-HPB cell growth in autologous fCM was dependent on cell number, as well as on the amount of fCM used. Treatment of the UC729-6 fCM using acid (pH 4.5), trypsin (100 micrograms/ml), and heat (56 degrees C) did not restore mitogen-stimulated lymphoproliferation. However, the inhibition observed with UC729-6 fCM was partially reversed after dialysis with membranes having M(r) limits of 2.5 x 10(4), 1.5 x 10(4), or 1 x 10(4).
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:issn |
0735-7907
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
10
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
201-8
|
| pubmed:dateRevised |
2004-11-17
|
| pubmed:meshHeading |
pubmed-meshheading:1533813-B-Lymphocytes,
pubmed-meshheading:1533813-Cell Division,
pubmed-meshheading:1533813-Culture Media,
pubmed-meshheading:1533813-Humans,
pubmed-meshheading:1533813-Immunosuppressive Agents,
pubmed-meshheading:1533813-Lymphocyte Activation,
pubmed-meshheading:1533813-Lymphocyte Culture Test, Mixed,
pubmed-meshheading:1533813-Melanoma,
pubmed-meshheading:1533813-Tumor Cells, Cultured
|
| pubmed:year |
1992
|
| pubmed:articleTitle |
Immunosuppression derived from human B-lymphoblastoid and melanoma cell lines.
|
| pubmed:affiliation |
Department of Microbiology, Loma Linda University School of Medicine, California 92350.
|
| pubmed:publicationType |
Journal Article
|