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. 1991 Mar;138(3):741–750.

Expression of VLA-alpha 2, VLA-alpha 6, and VLA-beta 1 chains in normal mucosa and adenomas of the colon, and in colon carcinomas and their liver metastases.

K Koretz 1, P Schlag 1, L Boumsell 1, P Möller 1
PMCID: PMC1886279  PMID: 2000944

Abstract

'Very late antigen' (VLA) proteins are members of the integrin superfamily with cell-surface receptor function and are involved in the cell-cell matrix interaction. They are heterodimers with a common beta 1 chain and different alpha chains counted through VLA-1 to VLA-6. The VLA-2 complex (alpha 2/beta 1) was found to act as collagen receptor on platelets and the VLA-6 complex (alpha 6/beta 1) as laminin receptor. Using monoclonal antibodies and an indirect immunoperoxidase method, we investigated the expression of VLA-alpha 2, VLA-alpha 6, and VLA-beta 1 chains in 20 normal colonic mucosa samples, in 20 colonic adenomas, and in 96 carcinomas together with 10 accompanying liver metastases. All three proteins were expressed throughout the colonic epithelium, except for VLA-alpha 2, which was present in the cryptic gland but was absent on the mucosal surface in some cases. In general, adenomas were strongly positive for the VLA proteins but 3 of 20 cases showed focal VLA-alpha 2-negative areas. The carcinomas revealed considerable heterogeneity of VLA-alpha 2 expression; ie, 59 tumors were completely positive, 35 tumors revealed a focal loss of antigen, and 2 cases were negative. This reduced antigen expression was statistically associated with Dukes' stage C/D (P = 0.003). VLA-alpha 6 was expressed throughout in all tumors. VLA-beta 1 was found extensively expressed in 77 carcinomas, partially expressed in 17 carcinomas, and was absent in 2 carcinomas. As compared to their primary tumors, liver metastases showed roughly corresponding patterns of antigen expression. The down regulation/loss of VLA proteins in a subset of epithelial colon tumors might cause a disturbed cell-cell/cell-matrix interaction that might augment the invasive property of their cells.

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