View by:  Subject  Theme  Question  Term  Person  Event

Human Embryonic Stem Cells

The study of human stem cells has barely begun and what is known is summarized in this section. The vast majority of experimental data discussed here are the results of experiments in mice. ES cells from the mouse have been intensely investigated since their discovery 18 years ago. Therefore, what is said about human ES cells assumes in part that their fundamental properties will resemble those of mouse ES cells. While on the surface this assumption appears to be reasonable it will have to be proven through intensive further investigation.

There is an abundance of stem cell lines from mammals including some from human beings. ES cells are valuable scientifically because they combine three properties not found together in other cell lines. First, they appear to replicate indefinitely without undergoing senescence (aging and death) or mutation of the genetic material. They are thus a large-scale and valuable source of cells. Second, ES cells appear genetically normal, both by a series of genetic tests and functionally as shown by the creation of mice with genomes derived entirely from ES cells. In mice these cells are developmentally totipotent; when inserted into an early embryo, they join the host cells to create a normal mouse, differentiating into every cell type of the body (it is this property that earns them the name “stem cell of the body”). ES cells can also differentiate into many cell types in tissue culture, including neurons, blood cells and cardiac and skeletal muscle. The normal embryo has about 100 cells with the properties of ES cells that exist for about one day and then develop into more advanced cell types. The isolation and subsequent growth of ES cells in culture allow scientists to obtain millions of these cells in a single tissue culture flask, making something once rare and precious now readily available to researchers. It is worth noting here the striking parallel to recombinant DNA and monoclonal antibody technologies, both of which have amplified rare and precious biological entities. Like those technologies, ES cell technology may well be transformative in opening scientific arenas that to date have been closed.

The isolation, culture, and partial characterization of stem cells isolated from human embryos was reported in November of 1998.Thomson, J.A., Waknitz, M.A., Swiergiel, J.J., and Marshall, V.S., "Embryonic Stem Cell Lines Derived from Human Blastocysts." Science, 282: 1061-1062 (1998). The ability of the cells to maintain their pluripotent character even after 4 to 5 months of culturing was demonstrated.Definitions of "pluripotent" generally include the potential of the cell to form derivatives from all three germ layers. Traditionally, the layers and their derivatives are the endoderm (giving... There is concern that this feature of these cells could also lead to cancerous growth. Thus far there are no data indicating the induction of malignant tumors, although there is some evidence for benign hyperproliferation (overgrowth of cells).Thomas Okarma (Geron Corporation), AAAS Public Forum on Stem Cell Research Issues (25 August 1999).

Email link | Printer-friendly | Feedback | Contributed by: AAAS DoSER and the Institute for Civil Society

Topic Sets Available

AAAS Report on Stem-Cells

AstroTheology: Religious Reflections on Extraterrestrial Life Forms

Agency: Human, Robotic and Divine
Becoming Human: Brain, Mind, Emergence
Big Bang Cosmology and Theology (GHC)
Cosmic Questions Interviews

Cosmos and Creator
Creativity, Spirituality and Computing Technologies
CTNS Content Home
Darwin: A Friend to Religion?
Demystifying Information Technology
Divine Action (GHC)
Dreams and Dreaming: Neuroscientific and Religious Visions'
E. Coli at the No Free Lunchroom
Engaging Extra-Terrestrial Intelligence: An Adventure in Astro-Ethics
Evangelical Atheism: a response to Richard Dawkins
Ecology and Christian Theology
Evolution: What Should We Teach Our Children in Our Schools?
Evolution and Providence
Evolution and Creation Survey
Evolution and Theology (GHC)
Evolution, Creation, and Semiotics

The Expelled Controversy
Faith and Reason: An Introduction
Faith in the Future: Religion, Aging, and Healthcare in the 21st Century

Francisco Ayala on Evolution

From Christian Passions to Scientific Emotions
Genetic Engineering and Food

Genetics and Ethics
Genetic Technologies - the Radical Revision of Human Existence and the Natural World

Genomics, Nanotechnology and Robotics
Getting Mind out of Meat
God and Creation: Jewish, Christian, and Muslim Perspectives on Big Bang Cosmology
God, Humanity and the Cosmos: A Textbook in Science and Religion
God the Spirit - and Natural Science
Historical Examples of the Science and Religion Debate (GHC)
History of Creationism
Intelligent Design Coming Clean

Issues for the Millennium: Cloning and Genetic Technologies
Jean Vanier of L'Arche
Nano-Technology and Nano-ethics
Natural Science and Christian Theology - A Select Bibliography
Neuroscience and the Soul
Outlines of the Science and Religion Debate (GHC)

Perspectives on Evolution

Physics and Theology
Quantum Mechanics and Theology (GHC)
Questions that Shape Our Future
Reductionism (GHC)
Reintroducing Teleology Into Science
Science and Suffering

Scientific Perspectives on Divine Action (CTNS/Vatican Series)

Space Exploration and Positive Stewardship

Stem-Cell Debate: Ethical Questions
Stem-Cell Ethics: A Theological Brief

Stem-Cell Questions
Theistic Evolution: A Christian Alternative to Atheism, Creationism, and Intelligent Design...
Theology and Science: Current Issues and Future Directions
Unscientific America: How science illiteracy threatens our future
Will ET End Religion?

Current Stats: topics: >2600, links: >300,000, video: 200 hours.