The analyses suggest that there is greater phylogenetic signal in the trophic characteristics of the species in this assemblage than in the other two niche components, and that trophic niches tend to diversify in a somewhat less punctuated (or more gradual) manner than other niches.
For example, it is conceivable that the preferential outgrowth of metastases in organs such as lymph nodes, lungs, liver, brain, and bone is due to the presence of endogenous microenvironments in these organs that already contain many metastatic niche components, and can therefore be more readily remodeled to produce metastatic niches.
Other niche components besides chips or motors: "pick-ups" that read the data on a DVD disc.
Here we outline various genetic approaches for isolating, detecting, and ablating HSCs and niche components and provide a guide for advantages and caveats to consider.
This approach enables further dissection of key cellular and niche components involved in thymic epithelial stem cell maintenance and T cell production.
Specialized niche environments specify and maintain stem and progenitor cells, but little is known about the identities and functional interactions of niche components in vivo.
Although the cellular and molecular components of the mouse BM HSC niche have been extensively studied using genetically modified animals, relatively little is known about the counterpart human BM niche components.
When these protocols involve in vitro manipulation of stem cells, the elements of niche components are usually used as the major players including soluble factors, extracellular matrix components, physical factors, and cells from other lineages.
Although in vivo studies have been instrumental to elucidate some of the mechanisms by which niches exert their function, the establishment of an in vitro model that recapitulates the fundamental interactions of the niche components in a controlled setting would be of great benefit.
In this chapter we focus on the mechanisms and "strategies" by which various niche components support LPCs in liver tissue regeneration, including administration of biomaterials or small molecules that target specific aspects of the niche, to stimulate expansion and differentiation of LPCs, or to cause transdifferentiation of adult liver cells.
Serine protease inhibitors α1-antitrypsin (serpina1) and α1-antichymotrypsin (serpina3) are expressed in the BM to prevent the accidental cleavage of niche components by neutrophil elastase and cathepsin G [23]; [23].
