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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 Front+Immunol
2018 ; 9
(ä): 588
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English Wikipedia
CEBPE-Mutant Specific Granule Deficiency Correlates With Aberrant Granule
Organization and Substantial Proteome Alterations in Neutrophils
#MMPMID29651288
Serwas NK
; Huemer J
; Dieckmann R
; Mejstrikova E
; Garncarz W
; Litzman J
; Hoeger B
; Zapletal O
; Janda A
; Bennett KL
; Kain R
; Kerjaschky D
; Boztug K
Front Immunol
2018[]; 9
(ä): 588
PMID29651288
show ga
Specific granule deficiency (SGD) is a rare disorder characterized by abnormal
neutrophils evidenced by reduced granules, absence of granule proteins, and
atypical bilobed nuclei. Mutations in CCAAT/enhancer-binding protein-? (CEBPE)
are one molecular etiology of the disease. Although C/EBP? has been studied
extensively, the impact of CEBPE mutations on neutrophil biology remains elusive.
Here, we identified two SGD patients bearing a previously described heterozygous
mutation (p.Val218Ala) in CEBPE. We took this rare opportunity to characterize
SGD neutrophils in terms of granule distribution and protein content. Granules of
patient neutrophils were clustered and polarized, suggesting that not only
absence of specific granules but also defects affecting other granules contribute
to the phenotype. Our analysis showed that remaining granules displayed mixed
protein content and lacked several glycoepitopes. To further elucidate the impact
of mutant CEBPE, we performed detailed proteomic analysis of SGD neutrophils.
Beside an absence of several granule proteins in patient cells, we observed
increased expression of members of the linker of nucleoskeleton and cytoskeleton
complex (nesprin-2, vimentin, and lamin-B2), which control nuclear shape. This
suggests that absence of these proteins in healthy individuals might be
responsible for segmented shapes of neutrophilic nuclei. We further show that the
heterozygous mutation p.Val218Ala in CEBPE causes SGD through prevention of
nuclear localization of the protein product. In conclusion, we uncover that
absence of nuclear C/EBP? impacts on spatiotemporal expression and subsequent
distribution of several granule proteins and further on expression of proteins
controlling nuclear shape.