Pluripotent (cell biology)
In cell biology, the definition of pluripotency has come to refer to a stem cell that has the potential to differentiate into any of the three derm layers: endoderm (interior stomach lining, gastrointestinal tract, the lungs), mesoderm (muscle, bone, blood, urogenital), or ectoderm (epidermal tissues and nervous system). Pluripotent stem cells can give rise to any fetal or adult cell type. However, alone they cannot develop into a fetal or adult animal because they lack the potential to contribute to extraembryonic tissue, such as the placenta.
In contrast, many progenitor cells are multipotent, i.e. they are capable of differentiating into a limited number of cell fates.
Pluripotent (biological compounds)
Pluripotency can also be used (albeit less commonly) to describe the ability of certain substances to produce several distinct biological responses.
For example, in immunology many cytokines are pluripotent, in that each of these compounds can activate specific behavior in some cell types and inhibit other behavior in other cell types. Interferon gamma represents an excellent example of pluripotency. In most somatic cells it inhibits growth and upregulates expression of Major Histocompatibility Complex (MHC) antigens in a general anti-viral response. In B lymphocytes (B cells) it stimulates antibody class switching, and in Natural Killer (NK) cells this protein hormone stimulates maturation. In macrophages it activates intracellular killing.
i hope i have not bin to vague for you
2007-11-05 19:34:10
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answer #2
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answered by Anonymous
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