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2016 ; 35
(31
): 4132-40
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Tetraspanin CD82 regulates bone marrow homing of acute myeloid leukemia by
modulating the molecular organization of N-cadherin
#MMPMID26592446
Marjon KD
; Termini CM
; Karlen KL
; Saito-Reis C
; Soria CE
; Lidke KA
; Gillette JM
Oncogene
2016[Aug]; 35
(31
): 4132-40
PMID26592446
show ga
Communication between acute myeloid leukemia (AML) and the bone marrow
microenvironment is known to control disease progression. Therefore, regulation
of AML cell trafficking and adhesion to the bone marrow is of significant
interest. In this study, we demonstrate that differential expression of the
membrane scaffold CD82 modulates the bone marrow homing of AML cells. By
combining mutational analysis and super-resolution imaging, we identify membrane
protein clustering by CD82 as a regulator of AML cell adhesion and bone marrow
homing. Cluster analysis of super-resolution data indicates that N-linked
glycosylation and palmitoylation of CD82 are both critical modifications that
control the microdomain organization of CD82 as well as the nanoscale clustering
of associated adhesion protein, N-cadherin. We demonstrate that the inhibition of
CD82 glycosylation increases the molecular packing of N-cadherin and promotes the
bone marrow homing of AML cells. In contrast, we find that the inhibition of CD82
palmitoylation disrupts the formation and organization of N-cadherin clusters and
significantly diminishes bone marrow trafficking of AML. Taken together, these
data establish a mechanism where the membrane organization of CD82, through
specific posttranslational modifications, regulates N-cadherin clustering and
membrane density, which impacts the in vivo trafficking of AML cells. As such,
these observations provide an alternative model for targeting AML where
modulation of protein organization within the membrane may be an effective
treatment therapy to disrupt the bone marrow homing potential of AML cells.