Intercellular transfer of shed tumor cell gangliosides

FEBS Letters

Ladisch, Stephan¹  Olshefski, Randal¹ 

[1] Center for Cancer and Transplantation Biology, Children's National Medical Center, Washington, DC 20010, USA

关键词: Ganglioside;    Ganglioside shedding;    Ganglioside transfer;    Intercellular signaling;   

DOI  :  10.1016/0014-5793(96)00392-4

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Three distinct steps underlie immunosuppression by tumor gangliosides: (i) their shedding by the tumor cell, (ii) binding to target leukocytes in the tumor microenvironment, and (iii) action upon the target cell. While shedding is well documented, cell to cell transfer of shed gangliosides is not. To address this, we employed a dual chamber culture system. In this system, metabolically radiolabeled lymphoma cells shed gangliosides into the conditioned medium of the contralateral chamber, which contained normal fibroblasts as the target cell. The shed lymphoma cell gangliosides bound avidly to the target fibroblasts in a trypsin-resistant manner (1−2×10⁶ and 7×10⁶ molecules/fibroblast in 24 and 48 h). Significantly higher than binding rates of purified lymphoma gangliosides added exogenously, these binding rates in a system which models the in vivo microenvironment suggest that cell to cell ganglioside transfer is a highly efficient process.

【 授权许可】

Unknown