A novel system for convenient detection of low‐affinity receptor–ligand interactions: Chelator‐lipid liposomes engrafted with recombinant CD4 bind to cells expressing MHC class II
A novel system for convenient detection of low‐affinity receptor–ligand interactions: Chelator‐lipid liposomes engrafted with recombinant CD4 bind to cells expressing MHC class II
复制标题
一种方便检测低亲和力受体-配体相互作用的新系统:植入重组 CD4 的螯合脂质脂质体与表达 MHC II 类的细胞结合
DOI:
10.1046/j.1440-1711.2001.01010.x
复制
发表时间:
2001
影响因子:
4
通讯作者:
J. Altin
中科院分区:
文献类型:
--
作者:
Christina L. van Broekhoven;J. Altin
The interactions of cell surface receptors with their ligands, crucial for initiating many immunological responses, are often stabilized by receptor dimerization/oligomerization, and by multimeric interactions between receptors on one cell with their ligands or cognate receptors on the apposing cell. Current techniques for studying receptor–ligand interactions, however, do not always allow receptors to move laterally to enable dimerization/ oligomerization, or to interact multimerically with ligands on cell surfaces. For these reasons detection of low‐ affinity receptor–ligand interactions has been difficult. Utilizing a novel chelator‐lipid, nitrilotriacetic acid di‐tetradecylamine (NTA‐DTDA), we have developed a convenient liposome system for directly detecting low‐affinity receptor–ligand interactions. Our studies using recombinant soluble forms of murine CD40 and B7.1, and murine and human CD4, each possessing a hexhistidine tag, showed that these proteins can be anchored or ‘engrafted’ directly onto fluorescently labelled liposomes via a metal‐chelating linkage with NTA‐DTDA, permitting them to undergo dimerization/oligomerization and multimeric binding with ligands on cells. Fluorescence‐ activated cell sorter (FACS) analyses demonstrated that while there is little if any binding of soluble forms of murine CD40 and B7.1, and murine and human CD4 to cells, engrafted liposomes bind specifically to cells expressing the appropriate cognate receptor, often giving a fluorescence 4–6‐fold above control cells. Such liposomes could detect directly the low‐affinity interaction of murine CD40 and B7.1 with CD154‐ and CD28‐expressing cells, respectively, and the interaction of CD4 with MHC Class II, which has hitherto defied direct detection except through mutational analysis and mAb blocking studies.
登录
查看更多内容
DOI:
10.1016/0167-5699(92)90154-y
发表时间:
1992
期刊:
Immunology today
影响因子:
--
作者:
Eiden,LE;Lifson,JD
通讯作者:
Lifson,JD
DOI:
10.1073/pnas.92.14.6444
发表时间:
1995
影响因子:
11.1
作者:
Sakihama,T;Smolyar,A;Reinherz,EL
通讯作者:
Reinherz,EL
DOI:
10.1073/pnas.92.17.8059
发表时间:
1995-08-15
影响因子:
11.1
作者:
MCHUGH, RS;AHMED, SN;SELVARAJ, P
通讯作者:
SELVARAJ, P
影响因子:
4.4
作者:
C. Yee;P. Savage;P. Lee;Mark M. Davis;P. Greenberg
通讯作者:
C. Yee;P. Savage;P. Lee;Mark M. Davis;P. Greenberg
DOI:
10.1016/0167-5699(95)80081-6
发表时间:
1995
期刊:
Immunology today
影响因子:
--
作者:
Sakihama,T;Smolyar,A;Reinherz,EL
通讯作者:
Reinherz,EL