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2017 ; 7
(1
): 5164
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Circulating primitive erythroblasts establish a functional, protein
4 1R-dependent cytoskeletal network prior to enucleating
#MMPMID28701737
Huang YS
; Delgadillo LF
; Cyr KH
; Kingsley PD
; An X
; McGrath KE
; Mohandas N
; Conboy JG
; Waugh RE
; Wan J
; Palis J
Sci Rep
2017[Jul]; 7
(1
): 5164
PMID28701737
show ga
Hematopoietic ontogeny is characterized by distinct primitive and definitive
erythroid lineages. Definitive erythroblasts mature and enucleate extravascularly
and form a unique membrane skeleton, composed of spectrin, 4.1R-complex, and
ankyrinR-complex components, to survive the vicissitudes of the adult
circulation. However, little is known about the formation and composition of the
membrane skeleton in primitive erythroblasts, which progressively mature while
circulating in the embryonic bloodstream. We found that primary primitive
erythroblasts express the major membrane skeleton genes present in similarly
staged definitive erythroblasts, suggesting that the composition and formation of
this membrane network is conserved in maturing primitive and definitive
erythroblasts despite their respective intravascular and extravascular locations.
Membrane deformability and stability of primitive erythroblasts, assayed by
microfluidic studies and fluorescence imaged microdeformation, respectively,
significantly increase prior to enucleation. These functional changes coincide
with protein 4.1?R isoform switching and protein 4.1R-null primitive
erythroblasts fail to establish normal membrane stability and deformability. We
conclude that maturing primitive erythroblasts initially navigate the embryonic
vasculature prior to establishing a deformable cytoskeleton, which is ultimately
formed prior to enucleation. Formation of an erythroid-specific, protein
4.1R-dependent membrane skeleton is an important feature not only of definitive,
but also of primitive, erythropoiesis in mammals.