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2016 ; 6
(ä): 26683
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Controlled Release of Collagen-Binding SDF-1? Improves Cardiac Function after
Myocardial Infarction by Recruiting Endogenous Stem Cells
#MMPMID27226084
Sun J
; Zhao Y
; Li Q
; Chen B
; Hou X
; Xiao Z
; Dai J
Sci Rep
2016[May]; 6
(ä): 26683
PMID27226084
show ga
Stromal cell-derived factor-1? (SDF-1?) is a well-characterized chemokine that
mobilizes stem cells homing to the ischemic heart, which is beneficial for
cardiac regeneration. However, clinically administered native SDF-1? diffuses
quickly, thus decreasing its local concentration, and results in side effects.
Thus, a controlled release system for SDF-1? is required to produce an effective
local concentration in the ischemic heart. In this study, we developed a
recombinant chemokine, consisting of SDF-1? and a collagen-binding domain, which
retains both the SDF-1? and collagen-binding activity (CBD-SDF-1?). In an in
vitro assay, CBD-SDF-1? could specifically bind to a collagen gel and achieve
sustained release. An intramyocardial injection of CBD-SDF-1? after acute
myocardial infarction demonstrated that the protein was largely tethered in the
ischemic area and that controlled release had been achieved. Furthermore,
CBD-SDF-1? enhanced the recruitment of c-kit positive (c-kit(+)) stem cells,
increased capillary density and improved cardiac function, whereas NAT-SDF-1? had
no such beneficial effects. Our findings demonstrate that CBD-SDF-1? can
specifically bind to collagen and achieve controlled release both in vitro and in
vivo. Local delivery of this protein could mobilize endogenous stem cells homing
to the ischemic heart and improve cardiac function after myocardial infarction.