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Updated: Jul 8, 2026

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Propagation of Human Embryonic Stem (ES) Cells
Published on: November 30, 2006
Parthenotes as a source of embryonic stem cells
1Laboratory of Biomedical Embryology, Centre for Stem Cell Research, University of Milan, Milan, Italy. tiziana.brevini@unimi.it
Cell Proliferation
|January 10, 2008
Summary
Artificial parthenogenesis offers an ethical alternative for generating pluripotent stem cells. This study explores human parthenotes as a viable source, overcoming ethical concerns associated with embryonic stem cells.
Area of Science:
- Reproductive biology
- Stem cell research
- Bioethics
Background:
- Human embryonic stem cell (hESC) derivation faces ethical challenges due to embryo destruction.
- The need for ethically sourced pluripotent stem cells drives research into alternatives.
- Artificial parthenogenesis presents a potential solution to these ethical dilemmas.
Purpose of the Study:
- To explore artificial parthenogenesis as an ethical source for pluripotent stem cells.
- To compare the biological characteristics of parthenotes and embryos.
- To evaluate the potential of human parthenogenetic stem cells for therapeutic applications.
Main Methods:
- Reviewing biological differences between parthenotes and embryos.
- Analyzing data from animal models on parthenogenetic stem cell similarity to biparental cells.
- Generating human parthenotes via artificial oocyte activation.
- Deriving parthenogenetic pluripotent stem cells from human parthenotes.
Main Results:
- Parthenotes offer a potential alternative to embryos for stem cell derivation.
- Animal model data suggests similarities between parthenogenetic and biparental stem cells.
- Successful generation of human parthenotes and derivation of pluripotent stem cells was achieved.
Conclusions:
- Human parthenogenetic stem cells present a promising, ethically sound alternative to hESCs.
- Further research is warranted to fully understand the therapeutic potential of these cells.
- Artificial parthenogenesis provides a pathway for advancing stem cell research ethically.
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Embryonic Stem Cells
Embryonic stem (ES) cells were first discovered in mice in 1981 by Martin Evans. In 1998, James Thomson identified a method to isolate embryonic stem cells from humans. Human embryonic stem cells (hESCs) are obtained from 3-5 day old embryos that remain unused after an in vitro fertilization procedure.
ES cells are grown in a culture medium where they can divide indefinitely, creating ES cell lines. Under certain conditions, ES cells can differentiate, either spontaneously into a variety of...
ES cells are grown in a culture medium where they can divide indefinitely, creating ES cell lines. Under certain conditions, ES cells can differentiate, either spontaneously into a variety of...
Embryonic Stem Cells
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Maintenance of the ES Cell State
The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore called induced pluripotent stem...

