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2017 ; 18
(4
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Nerve Growth Factor Signaling from Membrane Microdomains to the Nucleus:
Differential Regulation by Caveolins
#MMPMID28338624
Spencer A
; Yu L
; Guili V
; Reynaud F
; Ding Y
; Ma J
; Jullien J
; Koubi D
; Gauthier E
; Cluet D
; Falk J
; Castellani V
; Yuan C
; Rudkin BB
Int J Mol Sci
2017[Mar]; 18
(4
): ä PMID28338624
show ga
Membrane microdomains or "lipid rafts" have emerged as essential functional
modules of the cell, critical for the regulation of growth factor
receptor-mediated responses. Herein we describe the dichotomy between caveolin-1
and caveolin-2, structural and regulatory components of microdomains, in
modulating proliferation and differentiation. Caveolin-2 potentiates while
caveolin-1 inhibits nerve growth factor (NGF) signaling and subsequent cell
differentiation. Caveolin-2 does not appear to impair NGF receptor trafficking
but elicits prolonged and stronger activation of MAPK (mitogen-activated protein
kinase), Rsk2 (ribosomal protein S6 kinase 2), and CREB (cAMP response element
binding protein). In contrast, caveolin-1 does not alter initiation of the NGF
signaling pathway activation; rather, it acts, at least in part, by sequestering
the cognate receptors, TrkA and p75(NTR), at the plasma membrane, together with
the phosphorylated form of the downstream effector Rsk2, which ultimately
prevents CREB phosphorylation. The non-phosphorylatable caveolin-1 serine 80
mutant (S80V), no longer inhibits TrkA trafficking or subsequent CREB
phosphorylation. MC192, a monoclonal antibody towards p75(NTR) that does not
block NGF binding, prevents exit of both NGF receptors (TrkA and p75(NTR)) from
lipid rafts. The results presented herein underline the role of caveolin and
receptor signaling complex interplay in the context of neuronal development and
tumorigenesis.