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2017 ; 37
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): ä Nephropedia Template TP
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NDR1-Dependent Regulation of Kindlin-3 Controls High-Affinity LFA-1 Binding and
Immune Synapse Organization
#MMPMID28137909
Kondo N
; Ueda Y
; Kita T
; Ozawa M
; Tomiyama T
; Yasuda K
; Lim DS
; Kinashi T
Mol Cell Biol
2017[Apr]; 37
(8
): ä PMID28137909
show ga
Antigen-specific adhesion between T cells and antigen-presenting cells (APC)
during the formation of the immunological synapse (IS) is mediated by LFA-1 and
ICAM-1. Here, LFA-1-ICAM-1 interactions were measured at the single-molecule
level on supported lipid bilayers. High-affinity binding was detected at low
frequencies in the inner peripheral supramolecular activation cluster (SMAC) zone
that contained high levels of activated Rap1 and kindlin-3. Rap1 was essential
for T cell attachment, whereas deficiencies of ste20-like kinases, Mst1/Mst2,
diminished high-affinity binding and abrogated central SMAC (cSMAC) formation
with mislocalized kindlin-3 and vesicle transport regulators involved in T cell
receptor recycling/releasing machineries, resulting in impaired T cell-APC
interactions. We found that NDR1 kinase, activated by the Rap1 signaling cascade
through RAPL and Mst1/Mst2, associated with and recruited kindlin-3 to the IS,
which was required for high-affinity LFA-1/ICAM-1 binding and cSMAC formation.
Our findings reveal crucial roles for Rap1 signaling via NDR1 for recruitment of
kindlin-3 and IS organization.