With current methodologies, mouse embryonic fibroblast (MEF) cells have been used as a feeder layer to derive
both mouse and human iPS cells.
Not exact matches
The group has already started tweaking
human iPS cells using the same genes that Saitou pinpointed as being important in
mouse germ - cell development, but both Saitou
and Hayashi know that
human signalling networks are different from those in
mice.
The current research team, which includes Dr. Minoda
and Dr. Hiroki Takeda of Kumamoto University,
and several researchers from Keio University, have successfully grafted
human iPS - derived cells into the inner ear of embryonic
mice, a feat with a high level of technical difficulty.
The
mice show many of the symptoms that
human patients do,
and so they were an especially good candidate to test
iPS cells» abilities, says stem cell researcher Rudolf Jaenisch of the Whitehead Institute for Biomedical Research
and the Massachusetts Institute of Technology, both in Cambridge, who collaborated with Townes on the project.
To date, researchers have used
human iPS cells to make cardiac cells that repaired heart damage in a pig
and insulin - producing pancreas cells that reversed high blood sugar in
mice.
Yamanaka's group used
human adult skin cells
and induced them to become
iPS cells by having them produce the same protein factors that the
mouse iPS cells had.
Now you make one hundred
mice with these
human iPS derivatives
and ask: do all the
mice get diabetes?
Oct4, Sox2, c - Myc,
and Klf4 were the four original factors that were capable of converting
mouse and human fibroblasts into
iPs cells [1], [3], [5], [11], [12].
To our knowledge, this is the first report of generation
and maintenance of
mouse iPS cells on
human feeder cells without exogenous LIF.
Our lab uses both cardiomyoctes derived from
human stem cells (
iPS cell - derived cardiomyocytes)
and mouse models harboring the
human mutation to study which exact changes occur during the onset
and development of the disease.
Darabi R, Arpke RW, Irion S, et al.,
Human ES -
and iPS - derived myogenic progenitors restore DYSTROPHIN
and improve contractility upon transplantation in dystrophic
mice.
The immunopurification (
IP) of Argonaute (Ago), a central component of the RISC in the
human and mouse, followed by microarray analyses (Ago
IP / microarray method) makes it possible to isolate any Ago - associated miRNAs
and mRNAs without relying on the mechanism of regulation (i.e. mRNA decay or translational suppression), or sequence conservation, enabling a comprehensive identification of the miRNA - target genes in an unbiased manner.