Abstract:
:Although strong evidence is available suggesting that microenvironmental parameters play a role in lymphogenic or hematogenic metastasis, the underlying mechanisms are still unclear and further investigations of this topic are needed. For such a study however, an appropriate model of metastasis for in vivo analysis of this process would be required. An in vivo model of a solid tumor (rat DS sarcoma) has therefore been established to enable monitoring of the steps involved in tumor metastasis. Rat DS sarcoma cells were transfected with the pTracer-SV40 plasmid, containing the super-GFP and zeocin resistance genes. DS sarcoma cells showing high and stable expression of GFP (DSGFP cells) were selected by cell sorting and in vitro culturing with zeocin. To establish in vivo growth, DSGFP cells were subsequently injected intraperitoneally (i.p.) without additional selection by zeocin and GFP expression was monitored by flow cytometry. Using DSGFP ascites cells, solid tumors were implanted subcutaneously into the hind foot dorsum of rats. The expression of GFP was assayed by fluorescence microscopy. The detection of circulating DSGFP sarcoma cells in the blood was performed using the PCR technique. GFP expression in vitro was stable for more than 40 passages. Cell sorting, however, did not enable selection of a DSGFP cell population with a higher long-term stable GFP expression. After i.p. cell implantation, GFP expression in DSGFP ascites cells was maintained over at least 19 passages. Solid tumors implanted by injection of DSGFP ascites cells showed stable GFP expression. The growth rate of solid DSGFP sarcomas was slightly slower compared to that of non-transfected cell lines. The detection limit for circulating DS sarcoma cells in blood was 100 DSGFP cells/ml whole rat blood. Micrometastases in loco-regional lymph nodes, lung and liver were detectable by immunohistology and real-time PCR. This in vivo model showing stable expression of GFP could be useful for analyzing the mechanisms of metastasis, particularly where micrometastases or circulating tumor cells are to be identified.
journal_name
Int J Oncoljournal_title
International journal of oncologyauthors
Thews O,Lambert C,Kelleher DK,Biesalski HK,Vaupel P,Frank Jkeywords:
subject
Has Abstractpub_date
2005-09-01 00:00:00pages
705-12issue
3eissn
1019-6439issn
1791-2423journal_volume
27pub_type
杂志文章abstract::Cancer progression has been associated with an increase in genomic instability indicated by inactivation of tumor suppressor genes and activation of oncogenes. Epidemiological and experimental evidence has implicated estrogens in the etiology of breast cancer. To study environmental organophosphorous pesticides is of ...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo_00000421
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abstract::Specific RE protein species modulated by autocrine TGF alpha are unknown. HCT116 cells transfected with TGF alpha antisense expression vector were compared with control HCT116 NEO for mitogenesis and modulation of high MW (130, 120 kD) and low MW (116, 110, 105 kD) RE species. Nutrients alone (N) induced maximal mitog...
journal_title:International journal of oncology
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journal_title:International journal of oncology
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journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2.5.807
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journal_title:International journal of oncology
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doi:10.3892/ijo.5.5.1059
更新日期:1994-11-01 00:00:00
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journal_title:International journal of oncology
pub_type: 杂志文章,多中心研究
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journal_title:International journal of oncology
pub_type: 杂志文章
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更新日期:2012-06-01 00:00:00
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journal_title:International journal of oncology
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doi:
更新日期:1996-07-01 00:00:00
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journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2002-09-01 00:00:00
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journal_title:International journal of oncology
pub_type: 杂志文章
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journal_title:International journal of oncology
pub_type: 杂志文章,多中心研究
doi:
更新日期:2004-09-01 00:00:00
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journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2005-04-01 00:00:00
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journal_title:International journal of oncology
pub_type: 杂志文章,评审
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