The zymogen granule protein 2 (GP2) binds to scavenger receptor expressed on endothelial cells I (SREC-I).

The zymogen granule protein 2 (GP2) binds to scavenger receptor expressed on endothelial cells I (SREC-I).
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DOI:
10.1016/j.cellimm.2010.12.001
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发表时间:
2011
影响因子:
4.3
通讯作者:
Zlabinger, Gerhard J.
Zlabinger, Gerhard J.
中科院分区:
医学4区
文献类型:
--
作者:
Hoelzl, Markus A.;Hofer, Johannes;Kovarik, Johannes J.;Roggenbuck, Dirk;Reinhold, Dirk;Goihl, Alexander;Gaertner, Miriam;Steinberger, Peter;Zlabinger, Gerhard J.

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胰腺酶原颗粒膜蛋白 (GP2) 由胰腺腺泡细胞和回肠 M 细胞表达。 GP2 是尿液中 Tamm-Horsfall 蛋白 (THP) 最密切相关的同源物。最近,研究表明THP是多种清道夫受体(SR)的配体。因此,我们很感兴趣 GP2 是否具有类似的特性。不同SR的cDNA被稳定转染至小鼠胸腺瘤细胞系中。 GP2 被重组表达、纯化并生物素化。通过流式细胞术分析转​​染细胞或单核细胞衍生的树突状细胞 (moDC) 对 GP2 的结合或摄取。 GP2 是在内皮细胞 I (SREC-I) 上表达的清道夫受体的结合配偶体,但不是 SR-AI 和 SR-BI 的结合配偶体。 GP2 与 SREC-I 结合的解离常数 (Kd) 为 41.3 nM。 SREC 转染细胞能够内化 GP2。 moDC表达SREC-I并且还结合并内化GP2。用抗SREC-I抗体抑制moDC上的SREC-1不会导致GP2结合减少。 GP2 与 SREC-I 和摄取的相互作用可能对抗原清除和免疫反应的介导产生深远的影响。除了 SREC-I 之外,DC 上其他目前未知的 GP2 受体也可能参与这一过程。
The pancreatic zymogen granule membrane protein (GP2) is expressed by pancreatic acinar cells and M cells of the ileum. GP2 is the closest related homologue of the urine resident Tamm–Horsfall protein (THP). Recently, it was shown that THP is a ligand of various scavenger receptors (SRs). Therefore, we were interested, if GP2 has similar properties. cDNA of different SRs was stably transfected into a murine thymoma cell line. GP2 was recombinantly expressed, purified and biotinylated. Binding or uptake of GP2 by transfected cells or monocyte-derived dendritic cells (moDCs) was analyzed by flow-cytometry. GP2 is a binding partner of the scavenger receptor expressed on endothelial cells I (SREC-I) but not of SR-AI and SR-BI. The dissociation constant (Kd) of GP2 binding to SREC-I is 41.3 nM. SREC transfected cells are able to internalize GP2. moDCs express SREC-I and also bind and internalize GP2. Inhibition of SREC-I on moDCs with anti-SREC-I antibodies does not result in a decreased GP2 binding. Interaction of GP2 with SREC-I and uptake might have profound effects in antigen clearance and mediation of the immune response. In addition to SREC-I other presently unknown receptors for GP2 on DCs might be involved in this process.
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