کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1983573 1539899 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Expression of carbohydrate-antigen sialyl-Lewis a on colon cancer cells promotes xenograft growth and angiogenesis in nude mice
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Expression of carbohydrate-antigen sialyl-Lewis a on colon cancer cells promotes xenograft growth and angiogenesis in nude mice
چکیده انگلیسی

We investigated the role of carbohydrate antigen sialyl-Lewis a (sLea), an E-selectin ligand and epitope of tumor marker CA19.9, in the development of xenografts in nude mice. To this end, animals were inoculated with the human colon cancer cell line HCT-15, expressing no Lewis antigens, or with a clone expressing sLea (HCT-15-T5). The size of HCT-15-T5 xenografts appeared larger than those of HCT-15 and their average weight was over twice bigger. In both xenografts the mitotic index was found elevated, as determined by Ki-67 assay, and no apoptosis was detected in the tumor cells by both caspase 8 or TUNEL assays. Some apoptotic signals were instead detected in the vessels. Conversely, microvessel density, determined through CD-31 immunohistochemistry, was found 3.2-folds bigger in HCT-15-T5 xenografts (p < 0.012). Only the membranes of HCT-15-T5 cells grown as xenografts reacted intensively with the anti CA19.9 antibody 1116-NS-19-9 by immunofluorescence, but not by immunohistochemistry. Unknown structures were instead stained by such technique in both xenografts, as were in mouse tissues not expressing the antigen and in human colon adenocarcinoma. We conclude that expression of sLea on the surface of colon cancer cells improves xenograft growth and is associated with enhanced angiogenesis, while immunohistochemistry with 1116-NS-19-9 antibody appears not suitable to determine CA19.9 expression.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The International Journal of Biochemistry & Cell Biology - Volume 45, Issue 12, December 2013, Pages 2796–2800
نویسندگان
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