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2016 ; 213
(11
): 2437-2457
Nephropedia Template TP
gab.com Text
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The scaffolding function of the RLTPR protein explains its essential role for
CD28 co-stimulation in mouse and human T cells
#MMPMID27647348
Roncagalli R
; Cucchetti M
; Jarmuzynski N
; Grégoire C
; Bergot E
; Audebert S
; Baudelet E
; Menoita MG
; Joachim A
; Durand S
; Suchanek M
; Fiore F
; Zhang L
; Liang Y
; Camoin L
; Malissen M
; Malissen B
J Exp Med
2016[Oct]; 213
(11
): 2437-2457
PMID27647348
show ga
The RLTPR cytosolic protein, also known as CARMIL2, is essential for CD28
co-stimulation in mice, but its importance in human T cells and mode of action
remain elusive. Here, using affinity purification followed by mass spectrometry
analysis, we showed that RLTPR acts as a scaffold, bridging CD28 to the
CARD11/CARMA1 cytosolic adaptor and to the NF-?B signaling pathway, and
identified proteins not found before within the CD28 signaling pathway. We
further demonstrated that RLTPR is essential for CD28 co-stimulation in human T
cells and that its noncanonical pleckstrin-homology domain, leucine-rich repeat
domain, and proline-rich region were mandatory for that task. Although RLTPR is
thought to function as an actin-uncapping protein, this property was dispensable
for CD28 co-stimulation in both mouse and human. Our findings suggest that the
scaffolding role of RLTPR predominates during CD28 co-stimulation and underpins
the similar function of RLTPR in human and mouse T cells. Along that line, the
lack of functional RLTPR molecules impeded the differentiation toward Th1 and
Th17 fates of both human and mouse CD4(+) T cells. RLTPR was also expressed in
both human and mouse B cells. In the mouse, RLTPR did not play, however, any
detectable role in BCR-mediated signaling and T cell-independent B cell
responses.