Embryonic Stem Cells

Several research groups attempted to identify growth factors that maintain human ES cells and attempted to determine culture conditions that would reduce human ES cell exposure to non-human animal products. An important growth factor, bFGF, permits the maintenance of human ES cells with serum substitutes in the presence of fibroblasts, and this medium permits clonal expansion of human ES cells. Here, human ES cells are cultured on a protein matrix (mouse matrigel or laminin) in a medium containing bFGF, which was formerly "condition", by co-culturing with such a culture system but with fibroblasts Propagate. Direct contact between human ES cells and fibroblasts is eliminated but it does not exclude the possibility of introducing mouse pathogens into the culture via fibroblasts. It has been found that several different sources of human feeder cells support the culturing of human ES cells, thereby eliminating the possibility that pathogens will be transferred from mice to humans 20-23. There are ruins. Further studies are needed to develop a culture system that does not use fibroblasts at all, which also reduces the majority of the variability associated with the current culture of human ES cells. Sato et al. It has been reported that 6-bromine indirubin 3 '- (BIO) activates the Wnt pathway and promotes ES cell self-renewal in the presence of bFGF, Matrigel and proprietary serum replacement products 24 Amit et al. It has been reported that bFGF, TGFβ and LIF can support several human ES cell lines without feeder cells 25. These new culture conditions have several problems with different human ES cell lines, but there are reasons to believe human embryonic stem cells. Determination of culture conditions will be achieved soon, it reduces the possibility of pathogen contamination *

There is extensive controversy regarding the use of human embryonic stem cells. This controversy is primarily directed to techniques for deriving new embryonic stem cell lines that normally require the destruction of blastocysts. The opposition to the use of human embryonic stem cells in research is usually based on philosophical, moral or religious objections. This study includes adult stem cells, amniotic stem cells, and induced pluripotent stem cells.

Embryonic stem cells and adult stem cells are often compared in the field of stem cell research. The use of controversial embryonic stem cells is supported on the basis of their many advantages over adult stem cells. Embryonic stem cells are more readily available; they have greater cell proliferation, also known as proliferation, ability; and they are more versatile. Blastocyst stem cells are isolated from the embryo during the blastocyst stage and the process destroys the structure of the embryo to the extent that the embryo can no longer grow. Since these stem cells are obtained when the inner cell mass is concentrated in the embryo, they are more readily available than adult stem cells and the number of adult stem cells is limited. Another beneficial advantage of embryonic stem cells is their ability to grow and grow indefinitely when cultured under appropriate conditions (Devolder 9)

There are three types of stem cells. Embryonic stem cells, adult stem cells, artificial pluripotent stem cells (iPS). The most famous type of stem cells are embryonic stem cells. This is due to the extensive coverage of such stem cells by the media and for many judicial laws developed based on their use. They are also popular among researchers because they are the most flexible type of stem cells. Unlike more mature counterparts, they have the ability to regenerate all kinds of cells. Embryonic stem cells are found in two areas: umbilical cord and embryo. Embryonic stem cells are found in the blood taken from the umbilical cord immediately after birth. It contains hematopoietic stem cells that can be used to produce erythrocytes; among other things. There are also mesenchymal stem cells that can be used to grow muscle and bones. Hematopoietic cells are used for the treatment of blood related diseases such as autoimmune diseases and leukemia