Can a woman body reject transferred embryo - Answers
The female reproductive system have an inbuilt quality control mechanism that can reject sperm it doesn't find good enough to create a pregnancy, according to a new research. Tests found that females have an in-built system that assesses if the male partner is quality enough to invest her reproductive energy in, the ABC reported today quoting Sarah Robertson, researcher of University of Adelaide. It might be that with one partner they're having more trouble than they might with another partner. What we understand is that there is a partner-specific component to this. The research trial has primarily been on mice and pigs, but Robertson said there was some indication that it will have the same or similar effect on human females. Females can reject 'unworthy' sperm!
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Researchers at NYU School of Medicine have made an important discovery that partially answers the long-standing question of why a mother's immune system does not reject a developing fetus as foreign tissue. The researchers discovered that embryo implantation sets off a process that ultimately turns off a key pathway required for the immune system to attack foreign bodies. As a result, immune cells are never recruited to the site of implantation and therefore cannot harm the developing fetus. A central feature of the body's natural immune defense against transplanted foreign tissues and pathogens is the production of chemokines as a result of the local inflammatory response.