Articolo recente datato 18 Gennaio 2008:
TERT Promotes Epithelial Proliferation through Transcriptional Control of a Myc- and Wnt-Related Developmental Program.
Telomerase serves a critical role in stem cell function and tissue homeostasis. This role depends on its ability to synthesize telomere repeats in a manner dependent on the reverse transcriptase (RT) function of its protein component telomerase RT (TERT), as well as on a novel pathway whose mechanism is poorly understood. Here, we use a TERT mutant lacking RT function (TERT(ci)) to study the mechanism of TERT action in mammalian skin, an ideal tissue for studying progenitor cell biology. We show that TERT(ci) retains the full activities of wild-type TERT in enhancing keratinocyte proliferation in skin and in activating resting hair follicle stem cells, which triggers initiation of a new hair follicle growth phase and promotes hair synthesis. To understand the nature of this RT-independent function for TERT, we studied the genome-wide transcriptional response to acute changes in TERT levels in mouse skin. We find that TERT facilitates activation of progenitor cells in the skin and hair follicle by triggering a rapid change in gene expression that significantly overlaps the program controlling natural hair follicle cycling in wild-type mice. Statistical comparisons to other microarray gene sets using pattern-matching algorithms revealed that the TERT transcriptional response strongly resembles those mediated by Myc and Wnt, two proteins intimately associated with stem cell function and cancer. These data show that TERT controls tissue progenitor cells via transcriptional regulation of a developmental program converging on the Myc and Wnt pathways.
Traduzione molto molto approssimativa:
Telomerasi serve un ruolo critico nella funzione di cellule staminali e tessuti omeostasi. Questo ruolo dipende dalla sua capacità di sintetizzare telomere ripete in maniera dipendente dalla trascrittasi inversa (RT), la funzione della sua proteina componente RT telomerasi (TERT), nonché sul percorso di un romanzo il cui meccanismo è poco compresa. Qui, usiamo un mutante TERT manca RT funzione (TERT (ci)) per studiare il meccanismo di azione e di mammiferi TERT pelle, tessuto ideale per lo studio della biologia delle cellule progenitrici. Ci mostrano che TERT (ci) conserva la piena attività di tipo selvatico-TERT e rafforzare la proliferazione dei cheratinociti in pelle e dei capelli e l'attiv
TERT Promotes Epithelial Proliferation through Transcriptional Control of a Myc- and Wnt-Related Developmental Program.
Telomerase serves a critical role in stem cell function and tissue homeostasis. This role depends on its ability to synthesize telomere repeats in a manner dependent on the reverse transcriptase (RT) function of its protein component telomerase RT (TERT), as well as on a novel pathway whose mechanism is poorly understood. Here, we use a TERT mutant lacking RT function (TERT(ci)) to study the mechanism of TERT action in mammalian skin, an ideal tissue for studying progenitor cell biology. We show that TERT(ci) retains the full activities of wild-type TERT in enhancing keratinocyte proliferation in skin and in activating resting hair follicle stem cells, which triggers initiation of a new hair follicle growth phase and promotes hair synthesis. To understand the nature of this RT-independent function for TERT, we studied the genome-wide transcriptional response to acute changes in TERT levels in mouse skin. We find that TERT facilitates activation of progenitor cells in the skin and hair follicle by triggering a rapid change in gene expression that significantly overlaps the program controlling natural hair follicle cycling in wild-type mice. Statistical comparisons to other microarray gene sets using pattern-matching algorithms revealed that the TERT transcriptional response strongly resembles those mediated by Myc and Wnt, two proteins intimately associated with stem cell function and cancer. These data show that TERT controls tissue progenitor cells via transcriptional regulation of a developmental program converging on the Myc and Wnt pathways.
Traduzione molto molto approssimativa:
Telomerasi serve un ruolo critico nella funzione di cellule staminali e tessuti omeostasi. Questo ruolo dipende dalla sua capacità di sintetizzare telomere ripete in maniera dipendente dalla trascrittasi inversa (RT), la funzione della sua proteina componente RT telomerasi (TERT), nonché sul percorso di un romanzo il cui meccanismo è poco compresa. Qui, usiamo un mutante TERT manca RT funzione (TERT (ci)) per studiare il meccanismo di azione e di mammiferi TERT pelle, tessuto ideale per lo studio della biologia delle cellule progenitrici. Ci mostrano che TERT (ci) conserva la piena attività di tipo selvatico-TERT e rafforzare la proliferazione dei cheratinociti in pelle e dei capelli e l'attiv
] Marlin dagli un occhio! - http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=2211538&blobtype=pdf)