
IndraLab
Statements
reach
"Our findings can be summarized as follows : (i) the tyrosine kinase activity of the IGF-IR is essential for the interaction with p52Shc and IRS-1, (ii) p52Shc and IRS-1 bind to the IGF-IR in the NPEY-juxtamembrane motif, (iii) contrary to p52Shc, IRS-1 binds also to the major autophosphorylation sites (Tyr 1131, -1135, and -1136) of the IGF-IR, and (iv) the amino-terminal domain of p52Shc is required for its association with the IR and the IGF-IR."
reach
"Although the K D for IRS1 binding to IGF1R is not well established, the PTB domain of IRS1 has an affinity for INSR phosphosites that is approximately 20-fold weaker than that of SHC1 's PTB domain [XREF_BIBR], and protein copy numbers for IRS1 tended to be two to three orders of magnitude lower than those of SHC1 (XREF_SUPPLEMENTARY)."
sparser
"TRAF4 overexpression further augmented this interaction ( xref A ), indicating that TRAF4 enhances IGF-1-induced tyrosine phosphorylation of IRS-1 through promoting the interaction between IRS-1 and IGF-1R. The amount of p85 bound to IRS-1 upon IGF-1 stimulation also was significantly increased when TRAF4 is overexpressed, consistent with the level of IRS-1 tyrosine phosphorylation."
sparser
"We further knocked down endogenous TRAF4 in MCF-7 cells and found that TRAF4 depletion abolished IGF-1-induced interaction between IGF-1Rβ and IRS-1; the upregulation of IRS-1 tyrosine phosphorylation, including Y612 and Y896 phosphorylation; and the induced association between p85 and IRS-1 compared with the nontargeting control ( xref D )."
sparser
"Altogether, our results demonstrate that TRAF4-mediated IRS-1 ubiquitination leads to the enhancement of IRS-1 tyrosine phosphorylation through promoting the interaction between IRS-1 and IGF-1R; the phosphorylated IRS-1 in turn binds p85 regulatory subunit of PI3K to activate the downstream effectors ( xref )."
sparser
"Another possibility could be that the K29-linked ubiquitin chain conjugated at the K1186 and K1189 sites stabilizes the binding of IRS-1 and IGF-1R. Although the ubiquitination sites are located at the C-terminal end of IRS-1 while its interaction with IGF-1R occurs at the N-terminal PTB domain ( xref ), the spatial distance between the two regions could be close."
sparser
"Our findings can be summarized as follows: (i) the tyrosine kinase activity of the IGF-IR is essential for the interaction with p52Shc and IRS-1, (ii) p52Shc and IRS-1 bind to the IGF-IR in the NPEY-juxtamembrane motif, (iii) contrary to p52Shc, IRS-1 binds also to the major autophosphorylation sites (Tyr-1131, -1135, and -1136) of the IGF-IR, and (iv) the amino-terminal domain of p52Shc is required for its association with the IR and the IGF-IR."
sparser
"Indeed, previous studies found that PPP1R12A interacted with insulin receptor substrate 1-insulin-like growth factor 1 receptor (IRS1-IGF1R) complex and mediated the process of IRS1 dephosphorylation, promoting PI3K/AKT cascade activation and in turn led to tumor cell proliferation and tumor growth xref , xref ."
trips
"Our findings can be summarized as follows: (i) the tyrosine kinase activity of the IGF-IR is essential for the interaction with p52Shc and IRS-1, (ii) p52Shc and IRS-1 bind to the IGF-IR in the NPEY-juxtamembrane motif, (iii) contrary to p52Shc, IRS-1 binds also to the major autophosphorylation sites (Tyr-1131, -1135, and -1136) of the IGF-IR, and (iv) the amino-terminal domain of p52Shc is required for its association with the IR and the IGF-IR."
sparser
"Although the K D for IRS1 binding to IGF1R is not well-established, the PTB domain of IRS1 has an affinity for INSR phosphosites that is approximately 20-fold weaker than that of SHC1’s PTB domain [ xref ], and protein copy numbers for IRS1 tended to be two to three orders of magnitude lower than those of SHC1 ( xref )."
reach
"Collectively, FOXO1 activation is well correlated with Irs1 trafficking defect and the global decrease of Akt2 and highlights Irs1/Akt2/FOXO1 as an additional altered signaling pathway that participates to the early differentiation defect observed in Hrs-KD cells.Akt2 activation during myoblasts differentiation is mediated by IGFR and Irs1 and is regulated by the small GTPase Rab5a that coordinates the recruitment of Irs1 and IGFR on early endosomes [10, 53]."
reach
"Moreover, HRGbeta1 stimulation also promoted a significant decrease in association between IRS-1 and IGF-IR in both the MCF-7 and T47D cells, and densitometric analysis revealed this reduction to be statistically significant in both cell lines (P < = 0.01 (n = 3) and P < = 0.05 (n = 3), respectively)."
reach
"As mentioned previously, another interesting phenomenon noted in these studies is the finding that whilst HRGbeta1 treatment enhanced erbB3-IRS-1 interactions, it also promoted a decrease in the association between IRS-1 and IGF-IR, an effect that was clearly apparent in the MCF-7 and T47D cell lines."