Analysis of the molecular bases and the expression of the Lewis^x sugar chain, which may account for the high dissemination potential.

在粘液性囊腺癌、浆液性囊腺癌和透明细胞癌等多种卵巢肿瘤中，粘液性囊腺癌表现出独特的糖鞘糖脂组成。粘液性囊腺癌中90%以上的酸性鞘糖脂由硫代磷脂组成，在正常卵巢中几乎检测不到，在卵巢肿瘤类型中含量低于40%。将来源于卵巢透明细胞腺癌的人肿瘤细胞系RMG-1细胞注射到裸鼠体内，发现从肠系膜肿瘤结节中获得的细胞比原始RMG-1细胞形成更多、更大的肿瘤结节。Rmg-1-h细胞从肿瘤结节中转移到培养物中，在体内传至第4代后，显示出与直接从组织中扩散的细胞一样高的扩散潜能，并且远远高于rmg…。多-1个细胞。为了评估RMG-1和RMG-1-h细胞不同生物学特性的分子基础，我们比较了两种细胞中各种糖类抗原的含量和表达。与流式细胞术检测RMG-1细胞中Le^x阳性细胞的宽直方图不同，RMG-1-h细胞的直方图中去除了抗Le^x抗体弱阳性和中等阳性的细胞，导致强表达Le^x的细胞增多，这可能是RMG-1细胞具有较高的播散潜能的原因。此外，抗Le^x抗体可显著抑制RMG-1细胞与间皮细胞的黏附，提示Le^x介导了卵巢癌细胞与间皮细胞之间的细胞间相互作用。因此，卵巢癌细胞的高扩散潜能是由Le^x决定簇介导的，携带Le^x的细胞通过重复体内传代进入裸鼠体内而得到丰富。较少

Among several human ovarian tumors, which include mucinous cystadenocarcinoma, serous cystadenocarcinoma, and clear cell adenocarcinoma, the mucinous cystadenocarcinoma showed a unique glycosphingolipid composition. More than 90% of the acidic glycosphingolipids in the mucinous cystadenocarcinoma is comprised of sulfolipids, which are hardly detected in normal ovary and are contained in concentrations of less than 40% in the type of ovarian tumors.Cells of the human tumor cell line RMG- 1, derived from a clear cell adenocarcinoma of the ovary were injected intraperitoneally into nude mice, and the cells obtained from the tumor nodules in the mesenterium were found to form a larger number of, and larger-sized, tumor nodules than the original RMG- 1 cells. The RMG- 1-h cells, transferred into culture from the tumor nodules after a 4th in vivo passage, showed a dissemination potential as high as that of cells disseminating directly from the tissues, and exceedingly higher than that of RMG … More - 1 cells. To assess the molecular bases of the different biological properties of RMG- 1 and RMG- 1 -h cells, we compared the content and expression of various carbohydrate antigens in both cells. In contrast to the broad histogram for the Le^x-bearing cells among RMG- 1 cells in flow cytometry, the weakly and moderately positive cells toward anti-Le^x antibody were found to be eliminated from the histogram for the RMG- 1 -h cells, resulting in the enrichment of cells strongly expressing Le^x, which may account for the high dissemination potential. In addition, the adhesion of RMG- 1 cells to mesothelial cells was found to be significantly inhibited by pretreatment of the cells with anti-Le^x antibody, indicating Le^x mediated cell-to-cell interaction between ovarian cancer cells and mesothelial cells. Thus, the high dissemination potential of ovarian cancer cells was shown to be mediated by the Le^x-determinant and the Le^x-bearing cells are enriched by repeated in vivo passage of the cells into nude mice. Less