Constitutive gene expression of four components of plasminogen activating enzyme system, urinary and tissue-type plasminogen activator (u-PA and t-PA), plasminogen activator inhibitor 1 (PAI-1) and PAI-2 in HT-1080 human fibrosarcoma cells, was modulated by the synthetic glucocorticoid dexamethasone (Dex, 10(-7) M).
Human rTNF/Cachectin was shown to stimulate gene transcription of plasminogen activator inhibitor (PA1)-1 and PAI-2, and simultaneously suppress constitutive gene expression of tissue-type plasminogen activator (t-PA) in human fibrosarcoma cells.
Constitutive gene expression of four components of plasminogen activating enzyme system, urinary and tissue-type plasminogen activator (u-PA and t-PA), plasminogen activator inhibitor 1 (PAI-1) and PAI-2 in HT-1080 human fibrosarcoma cells, was modulated by the synthetic glucocorticoid dexamethasone (Dex, 10(-7) M).
Constitutive gene expression of four components of plasminogen activating enzyme system, urinary and tissue-type plasminogen activator (u-PA and t-PA), plasminogen activator inhibitor 1 (PAI-1) and PAI-2 in HT-1080 human fibrosarcoma cells, was modulated by the synthetic glucocorticoid dexamethasone (Dex, 10(-7) M).
Cell strains derived from such foci expressed high levels of T24 HRAS product p21, formed colonies in soft agar at high frequency, proliferated rapidly in serum-free medium that does not support growth of the parental cell line, and formed progressively growing, invasive fibrosarcomas.
A severe decrease in the expression of the rap1A gene was shown in the fibrosarcomas and the adenocarcinoma of the salivary gland studied, as compared to their normal counterparts, whereas no rap2 expression was found in the polyadenylated RNA of sarcoma samples.
Transfection of a human fibrosarcoma cell line with chloramphenicol acetyltransferase expression plasmids linked to a 5'-flanking deletion mutants of the IL-8 gene demonstrated that the nucleotides between -94 and -71 base pairs from the start of the first exon are essential and sufficient for the IL-8 induction by either IL-1, TNF, or phorbol 12-myristate 13-acetate.
We have identified a tumor-derived mediator which enhances endothelial procoagulant activity and the cellular response to TNF using cultured cells derived from a murine methylcholanthrene A (meth A)-induced fibrosarcoma as a model system.
Induction and stimulation of 92-kDa gelatinase/type IV collagenase production in osteosarcoma and fibrosarcoma cell lines by tumor necrosis factor alpha.
Induction and stimulation of 92-kDa gelatinase/type IV collagenase production in osteosarcoma and fibrosarcoma cell lines by tumor necrosis factor alpha.
A polypeptide factor produced by fibrosarcoma cells that induces endothelial tissue factor and enhances the procoagulant response to tumor necrosis factor/cachectin.
HT1080/DR4 (DR4) is a doxorubicin-resistant human fibrosarcoma line that exhibits 150-fold cross-resistance to etoposide but does not overexpress P-glycoprotein (one mechanism of multiple drug resistance).
In addition, E1A blocked the 12-O-tetradecanoyl phorbol acetate (TPA) induction of interstitial collagenase transcription in HT1080 fibrosarcoma cells.
To study the effects of localized secretion of cytokines on tumor progression, the gene for human interleukin 2 (IL-2) was introduced via retroviral vectors into CMS-5 cells, a weakly immunogenic mouse fibrosarcoma cell line of BALB/c origin.
Transfection of a human fibrosarcoma cell line with chloramphenicol acetyltransferase expression plasmids linked to a 5'-flanking deletion mutants of the IL-8 gene demonstrated that the nucleotides between -94 and -71 base pairs from the start of the first exon are essential and sufficient for the IL-8 induction by either IL-1, TNF, or phorbol 12-myristate 13-acetate.
Transfection of a human fibrosarcoma cell line with chloramphenicol acetyltransferase expression plasmids linked to a 5'-flanking deletion mutants of the IL-8 gene demonstrated that the nucleotides between -94 and -71 base pairs from the start of the first exon are essential and sufficient for the IL-8 induction by either IL-1, TNF, or phorbol 12-myristate 13-acetate.
Transfection of a human fibrosarcoma cell line with chloramphenicol acetyltransferase expression plasmids linked to a 5'-flanking deletion mutants of the IL-8 gene demonstrated that the nucleotides between -94 and -71 base pairs from the start of the first exon are essential and sufficient for the IL-8 induction by either IL-1, TNF, or phorbol 12-myristate 13-acetate.
Gene transcription rates and mRNA levels of plasminogen activator inhibitor type 2 (PAI-2) are markedly induced by the tumor promoting agent phorbol 12-myristate 13-acetate (PMA) in human HT1080 fibrosarcoma cells.
We have found that HT1080 x human fibroblast hybrids have reduced ability to invade a reconstituted basement membrane (Matrigel) in vitro compared to HT1080 cells, and abundantly secrete only the 68-72 kDa gelatinase/type IV collagenase.
Gelatinase assay of enzyme secreted by cultured human fibrosarcoma cells (HT-1080) revealed only low levels of 92-kDa type IV collagenase activity, whereas considerable activity of the 72-kDa enzyme was present.
Differential modulation of basement membrane gene expression in human fibrosarcoma HT-1080 cells by transforming growth factor-beta 1. Enhanced type IV collagen and fibronectin gene expression correlates with altered culture phenotype of the cells.