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001-es BibID:	BIBFORM048834
035-os BibID:	PMID:24005054
Első szerző:	Al-Nuaimi, Yusur
Cím:	A meeting of two chronobiological systems : circadian proteins period1 and BMAL1 modulate the human hair cycle clock / Yusur Al-Nuaimi, Jonathan A. Hardman, Tamás Bíró, Iain S. Haslam, Michael P. Philpott, Balázs I. Tóth, Nilofer Farjo, Bessam Farjo, Gerold Baier, Rachel E. B. Watson, Benedetto Grimaldi, Jennifer E. Kloepper, Ralf Paus
Dátum:	2014
ISSN:	0022-202X
Megjegyzések:	The hair follicle (HF) is a continuously remodeled mini organ that cycles between growth (anagen), regression (catagen), and relative quiescence (telogen). As the anagen-to-catagen transformation of microdissected human scalp HFs can be observed in organ culture, it permits the study of the unknown controls of autonomous, rhythmic tissue remodeling of the HF, which intersects developmental, chronobiological, and growth-regulatory mechanisms. The hypothesis that the peripheral clock system is involved in hair cycle control, i.e., the anagen-to-catagen transformation, was tested. Here we show that in the absence of central clock influences, isolated, organ-cultured human HFs show circadian changes in the gene and protein expression of core clock genes (CLOCK, BMAL1, and Period1) and clock-controlled genes (c-Myc, NR1D1, and CDKN1A), with Period1 expression being hair cycle dependent. Knockdown of either BMAL1 or Period1 in human anagen HFs significantly prolonged anagen. This provides evidence that peripheral core clock genes modulate human HF cycling and are an integral component of the human hair cycle clock. Specifically, our study identifies BMAL1 and Period1 as potential therapeutic targets for modulating human hair growth.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Calcium (Ca2+) signalling Ion channel Membrane transport Molecular mechanisms of disease Skin TRP channels
Megjelenés:	Journal of Investigative Dermatology 134 : 3 (2014), p. 610-619. -
További szerzők:	Hardman, Jonathan A. Bíró Tamás (1968-) (élettanász) Haslam, Iain S. Philpott, Michael P. Tóth István Balázs (1978-) (élettanász) Farjo, Nilofer Farjo, Bessam Baier, Gerold Watson, Rachel E. B. Grimaldi, Benedetto Kloepper, Jennifer E. Paus, Ralf
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM020307
035-os BibID:	WOS:000293282700039
Első szerző:	Ramot, Yuval
Cím:	Spermidine promotes human hair growth and is a novel modulator of human epithelial stem cell functions / Ramot Y., Tiede S., Biro T., Abu Bakar M. H., Sugawara K., Philpott M. P., Harrison W., Pietila M., Paus R.
Dátum:	2011
ISSN:	1932-6203
Megjegyzések:	Rapidly regenerating tissues need sufficient polyamine synthesis. Since the hair follicle (HF) is a highly proliferative mini-organ, polyamines may also be important for normal hair growth. However, the role of polyamines in human HF biology and their effect on HF epithelial stem cells in situ remains largely unknown. Methods and Findings: We have studied the effects of the prototypic polyamine, spermidine (0.1-1 mu M), on human scalp HFs and human HF epithelial stem cells in serum-free organ culture. Under these conditions, spermidine promoted hair shaft elongation and prolonged hair growth (anagen). Spermidine also upregulated expression of the epithelial stem cell-associated keratins K15 and K19, and dose-dependently modulated K15 promoter activity in situ and the colony forming efficiency, proliferation and K15 expression of isolated human K15-GFP+ cells in vitro. Inhibiting the rate-limiting enzyme of polyamine synthesis, ornithine decarboyxlase (ODC), downregulated intrafollicular K15 expression. In primary human epidermal keratinocytes, spermidine slightly promoted entry into the S/G2-M phases of the cell cycle. By microarray analysis of human HF mRNA extracts, spermidine upregulated several key target genes implicated e.g. in the control of cell adherence and migration (POP3), or endoplasmic reticulum and mitochondrial functions (SYVN1, NACA and SLC25A3). Excess spermidine may restrict further intrafollicular polyamine synthesis by inhibiting ODC gene and protein expression in the HF's companion layer in situ. Conclusions: These physiologically and clinically relevant data provide the first direct evidence that spermidine is a potent stimulator of human hair growth and a previously unknown modulator of human epithelial stem cell biology.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	PLoS One. - 6 : 7 (2011), p. e22564. -
További szerzők:	Tiede, Stephan Bíró Tamás (1968-) (élettanász) Abu Bakar, Mohd Hilmi Sugawara, Koji Philpott, Michael P. Harrison, Wesley Pietila, Marko Paus, Ralf
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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