Abstract:
:Details of metastasis, the deadliest aspect of cancer, are unclear. Cell surface proteins play central roles in adhesive contacts between the tumor cell and the stroma during metastasis. We optimized a fast, small-scale isolation of biotinylated cell surface proteins to reveal novel metastasis-associated players from an isogenic pair of human MDA-MB-435 cancer cells with opposite metastatic phenotypes. Isolated proteins were trypsin digested and analyzed using LC-MS/MS followed by quantitation with the Progenesis LC-MS software. Sixteen proteins displayed over twofold expression differences between the metastatic and non-metastatic cells. Interestingly, overexpression of most of them (14/16) in the metastatic cells indicates a gain of novel surface protein profile as compared to the non-metastatic ones. All five validated, differentially expressed proteins showed higher expression in the metastatic cells in culture, and four of these were further validated in vivo. Moreover, we analyzed expression of two of the identified proteins, CD109 and ITGA6 in 3-dimensional cultures of six melanoma cell lines. Both proteins marked the surface of cells derived from melanoma metastasis over cells derived from primary melanoma. The unbiased identification and validation of both known and novel metastasis-associated proteins indicate a reliable approach for the identification of differentially expressed surface proteins.
journal_name
J Proteomicsjournal_title
Journal of proteomicsauthors
Karhemo PR,Ravela S,Laakso M,Ritamo I,Tatti O,Mäkinen S,Goodison S,Stenman UH,Hölttä E,Hautaniemi S,Valmu L,Lehti K,Laakkonen Pdoi
10.1016/j.jprot.2012.07.009subject
Has Abstractpub_date
2012-12-21 00:00:00pages
87-100eissn
1874-3919issn
1876-7737pii
S1874-3919(12)00539-8journal_volume
77pub_type
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