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2020年4月8日、中央社会保険医療協議会(中医協)総会が開催され、新型コロナウイルス感染症に伴う医療保険制度の対応が議論された。 厚生労働省保険局医療課は、外...

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Deficiency in surface expression of E-selectin ligand promotes lung colonization in a mouse model of breast cancer.

著者 Monzavi-Karbassi B , Whitehead TL , Jousheghany F , Artaud C , Hennings L , Shaaf S , Slaughter A , Korourian S , Kelly T , Blaszczyk-Thurin M , Kieber-Emmons T
Int J Cancer.2005 Nov 10 ; 117(3):398-408.
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Expression of sialyl Lewis(x) (sLe(x)) and sLe(a) on tumor cells is thought to facilitate metastasis by promoting cell adhesion to selectins on vascular endothelial cells. Experiments supporting this concept usually bypass the early steps of the metastatic process by employing tumor cells that are injected directly into the blood. We investigated the relative role of sLe(x) oligosaccharide in the dissemination of breast carcinoma, employing a spontaneous murine metastasis model. An sLe(x) deficient subpopulation of the 4T1 mammary carcinoma cell line was produced by negative selection using the sLe(x)-reactive KM93 MAb. This subpopulation was negative for E-selectin binding but retained P-selectin binding. Both sLe(x)-negative and -positive cells grew at the same rate; however, sLe(x)-negative cells spread more efficiently on plates and had greater motility in wound-scratch assays. Mice inoculated in the mammary fat pad with sLe(x)-negative and -positive variants produced lung metastases. However, the number of lung metastases was significantly increased in the group inoculated with the sLe(x)-negative variant (p = 0.0031), indicating that negative selection for the sLe(x) epitope resulted in enrichment for a subpopulation of cells with a high metastatic phenotype. Cell variants demonstrated significant differences in cellular morphology and pattern of tumor growth in primary and secondary tumor sites. These results strongly suggest that loss of sLe(x) may facilitate the metastatic process by contributing to escape from the primary tumor mass.
PMID: 15906360 [PubMed - indexed for MEDLINE]
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