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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Immunol
2016 ; 17
(11
): 1312-1321
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The ubiquitin ligase Huwe1 regulates the maintenance and lymphoid commitment of
hematopoietic stem cells
#MMPMID27668798
King B
; Boccalatte F
; Moran-Crusio K
; Wolf E
; Wang J
; Kayembe C
; Lazaris C
; Yu X
; Aranda-Orgilles B
; Lasorella A
; Aifantis I
Nat Immunol
2016[Nov]; 17
(11
): 1312-1321
PMID27668798
show ga
Hematopoietic stem cells (HSCs) are dormant in the bone marrow and can be
activated in response to diverse stresses to replenish all blood cell types. We
identified the ubiquitin ligase Huwe1 as a crucial regulator of HSC function via
its post-translational control of the oncoprotein N-myc (encoded by Mycn). We
found Huwe1 to be essential for HSC self-renewal, quiescence and lymphoid-fate
specification in mice. Through the use of a fluorescent fusion allele (Mycn(M)),
we observed that N-myc expression was restricted to the most immature,
multipotent stem and progenitor populations. N-myc expression was upregulated in
response to stress or following loss of Huwe1, which led to increased
proliferation and stem-cell exhaustion. Mycn depletion reversed most of these
phenotypes in vivo, which suggested that the attenuation of N-myc by Huwe1 is
essential for reestablishing homeostasis following stress.