Abstract：
:To assess the putative role of extracellular matrix (ECM) proteins on lung cells interacting with integrin receptors on colon carcinoma cells, an in vitro adhesion assay was used to investigate these factors. Tumor necrosis factor (TNF)-alpha treatment of fetal lung cell line MRC 9, upregulated expression of ECM proteins and also supported enhanced adhesion of PTC colon carcinoma cells. Antibodies to ECM proteins significantly blocked this enhanced adhesion of PTC cells. Similarly, antibody blocking of beta1 and beta2 integrin receptors on PTC cells revealed the integrin receptors involved in this enhanced adhesion. beta1 integrin receptors like alpha2beta1, alpha4beta1 and alpha5beta1 on PTC cells were found interacting with their ECM ligands like fibronectin and laminin on TNF-alpha stimulated MRC 9 cells. Interestingly, PTC cells were found to constitutively express alphaLbeta2, which is normally expressed by leukocytes. The data from the present study indicates that expression of multiple beta1 and beta2 integrins by colon carcinoma cells putatively allows these cells to successfully adhere to secondary sites like lungs.
journal_name
Cancer Lettjournal_title
Cancer lettersauthors
Karmakar S,Mukherjee Rdoi
10.1016/s0304-3835(03)00208-8keywords:
subject
Has Abstractpub_date
2003-07-10 00:00:00pages
217-27issue
2eissn
0304-3835issn
1872-7980pii
S0304383503002088journal_volume
196pub_type
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