STEM CELLS AND THEIR NICHES
Stem cells involves in physiologic systems that express the outcome of developmental events and organismal stress, as these cells play a fundamental role of tissue maintenance and repair, the received signals will play a critical role in the integrity of the organism. Mostly focused is shown on stem cell identification and the molecular pathways involved in their regulation. Achievement of physiologically responsive stem cell functions is done by these pathways. The following information will help in understanding the stem cells in the context of their microenvironment regarding the relation between stem cell niche dysfunction, carcinogenesis and aging. The stem cells both reside and receive stimuli that determine their fate as stem cell niche is the in vivo microenvironment. Neither niche should not be considered simply a physical location for stem cells, nor as the place where extrinsic signals interact and integrate to influence stem cell behaviour. Stimuli includes ce...