Binding specificity of siglec7 to disialogangliosides of renal cell carcinoma: Possible role of disialogangliosides in tumor progression

Akihiro Ito, Kazuko Handa, Donald A. Withers, Makoto Satoh, Sen itiroh Hakomori

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Previous studies indicate that expression of higher gangliosides in renal cell carcinoma (RCC) is correlated with metastatic potential, particularly in the lung. Out of five major gangliosides in RCC, three disialogangliosides (disialogalactosylgloboside, IV3NeuAcIII6NeuAcLc4, and IV4GalNAcIV3NeuAcIII6NeuAcLc4) bind strongly to siglec7, which is expressed highly in monocytes and natural killer cells. Out of other gangliosides tested, 2 → 6 sialylparagloboside, GD3, GD2, and GT1b, but not other lacto- or ganglio-series gangliosides, showed clear binding to siglec7. In view of preferential metastasis of RCC to the lung, and binding of RCC cell line TOS-1 to lung tissue sections as shown in our previous study, we examined expression of siglec7 in the lung. siglec7 is expressed highly in resident blood cells, but not in parenchymatous cells. TOS-1 cells aggregate together strongly through adhesion with peripheral blood mononuclear cells to form large clumps. This suggests the possibility that such aggregates may form embolisms of microvasculature, particularly in the lung, which initiate metastasis. Other possible roles of higher gangliosides in RCC in promoting metastasis and tumor progression are discussed.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalFEBS Letters
Volume504
Issue number1-2
DOIs
Publication statusPublished - 2001 Aug 24

Keywords

  • Adhesion
  • Ganglioside
  • Metastasis
  • Renal cell carcinoma
  • Siglec7
  • TOS-1 cell

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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