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Specific cell surface binding sites shared by human Pro-IGF-I Eb-peptides and rainbow trout Pro-IGF-I Ea-4-peptide.

Abstract：

:Human pro-IGF-I Eb-peptide (hEb) and rainbow trout pro-IGF-I Ea-4-peptide (rtEa-4) have recently been shown to share unique biological activities [Gen. Comp. Endocrinol. 126 (2002) 342; Cell. Exp. Cell. Res. 280 (2002) 75]. To further understand the action mechanism of these proteins, we studied the binding properties of hEb-peptide and rtEa-4-peptide to intact human neuroblastoma cells (SK-N-F1) and membrane preparations. Human Eb-peptide and rtEa-4-peptide bind to a high-affinity binding site with an apparent dissociation constant of 3.2+/-1.9 x 10(-11) and 2.9+/-1.8 x 10(-11)M, respectively. Homologous displacement assay demonstrated the presence of a second binding site with an IC(50) of 4.8+/-2.6 x 10(-6)M for hEb-peptide and 2.1+/-0.6 x 10(-6)M for rtEa-4-peptide, respectively. Competition assays showed that hEb-peptide and rtEa-4-peptide shared common binding sites, distinct from those for IGF-I and insulin. In addition, chemical cross-linking studies revealed two specific binding complexes. Our findings support the notion that the initial step of pro-IGF-I E-peptide action is mediated through the interaction with conserved and specific putative membrane receptors on neuroblastoma cells.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Kuo YH,Chen TT

doi

10.1016/s0016-6480(03)00089-3

keywords:

subject

Has Abstract

pub_date

2003-06-15 00:00:00

pages

231-40

issue

2

eissn

0016-6480

issn

1095-6840

pii

S0016648003000893

journal_volume

132

pub_type

杂志文章

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