Embryo implantation in mouse: fetomaternal coordination in the pattern of expression of uPA, uPAR, PAI-1 and α2MR/LRP genes
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- 作者：Teesalu ; Tambet ; Blasi ; Francesco ; Talarico ; Daniela
- 关键词：Urokinase plasminogen activator ; Urokinase plasminogen activator receptor ; Plasminogen activator inhibitor type 1 ; α ; 2-Macroglobulin receptor ; Mouse embryo implantation ; Pseudopregnancy ; uPA null mutant
- 刊名：Mechanisms of Development
- 出版年：1996
- 出版时间：May, 1996
- 年：1996
- 卷：56
- 期：1-2
- 页码：103-116
- 全文大小：1.62 M
文摘
During the process of embryo implantation, trophoblast cells invade deep into uterine stroma and play a key role in establishing fetomaternal exchange of molecules. We have studied the in vivo expression patterns of the molecules of the urokinase system, during the process of mouse embryo implantation and early placentation. The sites of synthesis of urokinase-type plasminogen activator (uPA), uPA-receptor (uPAR), plasminogen activator inhibitor type 1 (PAI-1) and α2-macroglobulin receptor/low density lipoprotein receptor-related protein (α2MR/LRP) transcripts were determined by in situ hybridization. These genes were found to be expressed in a finely regulated pattern. High levels of uPA mRNA were found in invasive trophoblast cells, while the same cells did not appear to synthesize PAI-1. Starting from day 6.5, endothelial cells of newly forming vessels also transcribed uPA gene. uPAR and α2MR/LRP were in all stages expressed by decidual tissue, and their expression domains overlapped in large areas. Immunohistochemistry with uPA and PAI-1 antibodies revealed areas of co-localization of these secreted proteins with the expression domains of uPAR and α2MR/LRP, which is of great interest in view of the role of these two receptors in clearing uPA-PAI-1 complexes. In situ zymography demonstrated the presence of active uPA in the ectoplacental cone region at 7.5 and 8.5 days. Our studies outline the expression of a set of functionally related genes that is well coordinated between fetal and maternal tissues. This coordination may model other physiological and pathological invasive processes.