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2016 ; 7
(40
): 64785-64797
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
CD45 phosphatase is crucial for human and murine acute myeloid leukemia
maintenance through its localization in lipid rafts
#MMPMID27579617
Saint-Paul L
; Nguyen CH
; Buffière A
; Pais de Barros JP
; Hammann A
; Landras-Guetta C
; Filomenko R
; Chrétien ML
; Johnson P
; Bastie JN
; Delva L
; Quéré R
Oncotarget
2016[Oct]; 7
(40
): 64785-64797
PMID27579617
show ga
CD45 is a pan-leukocyte protein with tyrosine phosphatase activity involved in
the regulation of signal transduction in hematopoiesis. Exploiting CD45 KO mice
and lentiviral shRNA, we prove the crucial role that CD45 plays in acute myeloid
leukemia (AML) development and maintenance. We discovered that CD45 does not
colocalize with lipid rafts on murine and human non-transformed hematopoietic
cells. Using a mouse model, we proved that CD45 positioning within lipid rafts is
modified during their oncogenic transformation to AML. CD45 colocalized with
lipid rafts on AML cells, which contributes to elevated GM-CSF signal intensity
involved in proliferation of leukemic cells. We furthermore proved that the
GM-CSF/Lyn/Stat3 pathway that contributes to growth of leukemic cells could be
profoundly affected, by using a new plasma membrane disrupting agent, which
rapidly delocalized CD45 away from lipid rafts. We provide evidence that this
mechanism is also effective on human primary AML samples and xenograft
transplantation. In conclusion, this study highlights the emerging evidence of
the involvement of lipid rafts in oncogenic development of AML and the targeting
of CD45 positioning among lipid rafts as a new strategy in the treatment of AML.