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Multi-layered environmental regulation on the homeostasis of stem cells: the saga of hair growth and alopecia.

Abstract：

:Stem cells are fascinating because of their potential in regenerative medicine. Stem cell homeostasis has been thought to be mainly regulated by signals from their adjacent micro-environment named the "stem cell niche". However, recent studies reveal that there can be multiple layers of environmental controls. Here we review these environmental controls using the paradigm of hair stem cells, because to observe and analyze the growth of hair is easier due to their characteristic cyclic regeneration pattern. The length of hair fibers is regulated by the duration of the growth period. In the hair follicles, hair stem cells located in the follicle bulge interact with signals from the dermal papilla. Outside of the follicle, activation of hair stem cells has been shown to be modulated by molecules released from the intra-dermal adipose tissue as well as body hormone status, immune function, neural activities, and aging. The general physiological status of an individual is further influenced by circadian rhythms and changing seasons. The interactive networks of these environmental factors provide new understanding on how stem cell homeostasis is regulated, inspiring new insights for regenerative medicine. Therapies do not necessarily have to be achieved by using stem cells themselves which may constitute a higher risk but by modulating stem cell activity through targeting one or multiple layers of their micro- and macro-environments.

journal_name

J Dermatol Sci

journal_title

Journal of dermatological science

authors

Chen CC,Chuong CM

doi

10.1016/j.jdermsci.2012.02.007

subject

Has Abstract

pub_date

2012-04-01 00:00:00

pages

3-11

issue

1

eissn

0923-1811

issn

1873-569X

pii

S0923-1811(12)00058-8

journal_volume

66

pub_type

杂志文章,评审

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