In these instances, the committee says, the use of
existing embryonic cell lines derived from embryos fewer than 14 days old should be considered before resorting to the use of cells taken from surplus in vitro fertilization embryos fewer than 14 days old.
Not exact matches
In August of last year, President Bush approved the use of federal funds to support research on a limited number of
existing human
embryonic stem
cell lines.
Although he never banned this research outright, President Bush limited federal funding for research to the
embryonic stem
cell lines that
existed before August 2001, thus drawing a line at destroying human embryos created after that date.
He ruled that work on
existing embryonic stem
cell lines derived outside federally funded labs did not violate a ban on the destruction of embryos.
Existing European patents involving
embryonic stem
cells — most of which were issued in the United Kingdom — will not be invalidated immediately, but lawsuits challenging individual patents will use the ruling as guidance.
Consequently, a fundamental argument against using
embryonic stem
cells and therapeutic cloning can not be derived from
existing constitutional law and additional court decisions.
«Perhaps there are some mammary gland stem
cells that can be coaxed to have a slightly broader potential than normal, but I very much doubt that
embryonic - like
cells normally
exist in the breast,» says Robin Lovell - Badge of the National Institute for Medical Research in London.
Scientists have focused for decades on the role of biochemical cues in
embryonic development, Campàs said, because no techniques
existed to measure the mechanical cues that
cells are exposed to during the formation of tissues and organs.
In one promising approach, cellular reprogramming, stem
cells can be generated by fusing adult skin
cells with
embryonic stem
cells from
existing cell lines.
In 2001, after President Bush limited federally funded research to 69
existing embryonic stem
cell lines, Melton launched a private fund - raising crusade and developed 17 new lines that are now available to any reputable stem
cell researcher.
Stem
cell advocates have been expressing serious worry that ethical requirements spelled out in the draft guidelines — in particular, informed consent procedures for embryo donors — will rule out the use of many
existing human
embryonic stem
cell lines, including the 21 lines approved under the Bush Administration.
Although
embryonic stem
cells are naturally pluripotent, iPS
cells are created by scientists from
existing adult
cells, such as skin or blood.
Importantly, researchers must still study
existing embryonic stem
cell lines — the gold standard — to rule out any hidden risks in the lab - made
cells, he says.
Tensions have escalated since August 2001, when President George W. Bush limited publicly funded research on
embryonic stem
cells to already
existing lines.
In August of last year, President George W. Bush announced that scientists who received public research money could use only the human
embryonic stem -
cell lines that already
exist — a decision that dismayed many researchers.
Nevertheless, this type of
cell has a very short lifespan, limited to the first days of
embryonic development, and they do not
exist in any part of an adult organism.
Nephron progenitor
cells (NPCs), at least in humans, normally only
exist during a brief stage of
embryonic development.
The only stem
cell research he would permit, Bush said, was research using
existing embryonic lines as well as so - called adult stem
cells, which occur in anyone of any age.
Human
embryonic stem
cells can
exist in two different states that are termed naïve (the ground state) and primed (the state before differentiation into a specialised
cell).
The idea of reprogramming a
cell from adult tissue into an
embryonic - like
cell existed long before the creation of iPS
cells.
Such an immunological exemption could alleviate many concerns about using
cells for therapy that don't exactly match the recipient's immune system - such as
existing embryonic stem
cell lines that are not directly derived from the recipient.
The idea of reprogramming a
cell from adult tissue into an
embryonic - like, pluripotent
cell existed long before the creation of iPSCs.
Organized by the South Dakotans for Lifesaving Cures, the petition drive comes eight months after President Barack Obama overturned a 2001 order by then - President George W. Bush that barred the National Institutes of Health from funding
embryonic stem
cell research beyond the
existing stem
cell lines.
The order severely restricts
embryonic stem
cell research to
existing lines of
cells and bans federal funding for any research expansion outside his directive.
In this respect, EC
cells from teratocarcinomas resemble
embryonic stem (ES)
cells from normal animals, which scientists knew
existed, but could not isolate.