RASopathy-associated CBL germline mutations cause aberrant ubiquitylation and trafficking of EGFR
Standard
RASopathy-associated CBL germline mutations cause aberrant ubiquitylation and trafficking of EGFR. / Brand, Kristina; Kentsch, Hendrik; Glashoff, Christina; Rosenberger, Georg.
In: HUM MUTAT, Vol. 35, No. 11, 01.11.2014, p. 1372-81.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
Harvard
APA
Vancouver
Bibtex
}
RIS
TY - JOUR
T1 - RASopathy-associated CBL germline mutations cause aberrant ubiquitylation and trafficking of EGFR
AU - Brand, Kristina
AU - Kentsch, Hendrik
AU - Glashoff, Christina
AU - Rosenberger, Georg
N1 - © 2014 WILEY PERIODICALS, INC.
PY - 2014/11/1
Y1 - 2014/11/1
N2 - Noonan syndrome, a congenital disorder comprising a characteristic face, short stature, heart defects, learning difficulties, and a predisposition to malignancies, is caused by heterozygous germline mutations in genes encoding components of RAS-MAPK signaling pathways. Mutations in the CBL tumor suppressor gene have been reported in patients with a Noonan syndrome-like phenotype. CBL encodes a multivalent adaptor protein with ubiquitin ligase activity, which promotes ubiquitylation and vesicle-mediated internalization and degradation of the epidermal growth factor (EGF) receptor (EGFR). We investigated the functional consequences of disease-associated CBL amino acid changes p.K382E, p.D390Y, and p.R420Q on ligand-induced EGFR trafficking. Expression of CBL(K382E), CBL(D390Y), or CBL(R420Q) in COS-7 cells resulted in increased levels of surface EGFR and reduced amounts of intracellular EGFR; both consequences indicate ineffective EGFR internalization. Accordingly, receptor-mediated uptake of EGF was decreased. Furthermore, the p.K382E, p.D390Y, and p.R420Q lesions impaired CBL-mediated EGFR ubiquitylation and degradation. Together, these data indicate that pathogenic CBL mutations severely affect vesicle-based EGFR trafficking. Since we detected enhanced ERK phosphorylation in cells expressing mutant CBL, we conclude that aberrant EGFR trafficking contributes to augmented RAS-MAPK signaling, the common trait of Noonan syndrome and related RASopathies. Thus, our data suggest that EGFR trafficking is a novel disease-relevant regulatory level in the RASopathy network.
AB - Noonan syndrome, a congenital disorder comprising a characteristic face, short stature, heart defects, learning difficulties, and a predisposition to malignancies, is caused by heterozygous germline mutations in genes encoding components of RAS-MAPK signaling pathways. Mutations in the CBL tumor suppressor gene have been reported in patients with a Noonan syndrome-like phenotype. CBL encodes a multivalent adaptor protein with ubiquitin ligase activity, which promotes ubiquitylation and vesicle-mediated internalization and degradation of the epidermal growth factor (EGF) receptor (EGFR). We investigated the functional consequences of disease-associated CBL amino acid changes p.K382E, p.D390Y, and p.R420Q on ligand-induced EGFR trafficking. Expression of CBL(K382E), CBL(D390Y), or CBL(R420Q) in COS-7 cells resulted in increased levels of surface EGFR and reduced amounts of intracellular EGFR; both consequences indicate ineffective EGFR internalization. Accordingly, receptor-mediated uptake of EGF was decreased. Furthermore, the p.K382E, p.D390Y, and p.R420Q lesions impaired CBL-mediated EGFR ubiquitylation and degradation. Together, these data indicate that pathogenic CBL mutations severely affect vesicle-based EGFR trafficking. Since we detected enhanced ERK phosphorylation in cells expressing mutant CBL, we conclude that aberrant EGFR trafficking contributes to augmented RAS-MAPK signaling, the common trait of Noonan syndrome and related RASopathies. Thus, our data suggest that EGFR trafficking is a novel disease-relevant regulatory level in the RASopathy network.
U2 - 10.1002/humu.22682
DO - 10.1002/humu.22682
M3 - SCORING: Journal article
C2 - 25178484
VL - 35
SP - 1372
EP - 1381
JO - HUM MUTAT
JF - HUM MUTAT
SN - 1059-7794
IS - 11
ER -