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Biological consequences of thrombin receptor deficiency in mice
A L Darrow1, W P Fung-Leung, R D Ye
1R. W. Johnson Pharmaceutical Research Institute, Spring House, PA 19477, USA.
Thrombosis and Haemostasis
|December 1, 1996
Summary
Thrombin receptor (ThrR) gene disruption significantly impacts embryonic development. However, adult ThrR-deficient mice exhibit a normal phenotype, indicating compensatory mechanisms or limited adult physiological roles.
Area of Science:
- Molecular biology
- Physiology
- Genetics
Background:
- The thrombin receptor (ThrR), a G-protein-coupled receptor, mediates physiological responses to thrombin, crucial in tissue repair and inflammation.
- ThrR is widely expressed across various cell types and tissues, suggesting diverse functional roles.
Purpose of the Study:
- To investigate the physiological role of the thrombin receptor (ThrR) by creating and analyzing mice with a disrupted ThrR gene.
- To understand the impact of ThrR deficiency on embryonic development and adult physiological functions.
Main Methods:
- Homologous recombination was used to generate ThrR knockout mice.
- Genotyping of offspring from heterozygous intercrosses was performed to assess allele distribution.
- Adult ThrR knockout mice underwent comprehensive anatomical, histological, and physiological assessments.
Main Results:
- Homozygous ThrR knockout offspring represented only 7% of survivors, indicating severe embryonic lethality.
- Despite embryonic impact, adult ThrR knockout mice showed no significant differences in platelet function, cardiovascular parameters, or coagulation.
- Hemodynamic responses to ThrR-activating peptides were absent in adult knockout mice, confirming functional deficiency.
Conclusions:
- ThrR deficiency profoundly affects fetal development, leading to high embryonic mortality.
- Adult mice lacking functional ThrR display a surprisingly normal phenotype, suggesting developmental compensation or limited adult necessity.