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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Arterioscler+Thromb+Vasc+Biol
2015 ; 35
(1
): 163-74
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Protein tyrosine phosphatase 1B impairs diabetic wound healing through vascular
endothelial growth factor receptor 2 dephosphorylation
#MMPMID25395617
Zhang J
; Li L
; Li J
; Liu Y
; Zhang CY
; Zhang Y
; Zen K
Arterioscler Thromb Vasc Biol
2015[Jan]; 35
(1
): 163-74
PMID25395617
show ga
OBJECTIVE: Impaired wound healing is a major complication of diabetes mellitus.
The mechanisms that govern wound healing, however, are complex and incompletely
understood. In the present study, we determined the inhibitory role of protein
tyrosine phosphatase 1B (PTP1B) in the process of diabetic wound healing.
APPROACH AND RESULTS: First, by comparing the wound healing process in PTP1B
knockout (PTP1B(-/-)) mice, ob/ob mice and their wild-type littermates in the
presence or absence of streptozotocin treatment, we showed that the inhibition of
mouse wound healing in streptozotocin-induced diabetic conditions is because of
the upregulation and activation of PTP1B. Second, the impaired wound healing in
ob/ob mice and streptozotocin-treated wild-type mice was rescued by a PTP1B
inhibitor. Third, PTP1B, which is upregulated under hyperglycemic condition,
inhibited the tube formation, proliferation, and migration of human microvascular
endothelial cells induced by vascular endothelial growth factor, whereas this
inhibition was largely abolished by the PTP1B inhibitor. Finally, mechanism study
further indicated that PTP1B likely suppressed the proliferation, migration, and
tube formation of vascular endothelial cells through dephosphorylation of
vascular endothelial growth factor receptor 2. CONCLUSIONS: Our study
demonstrated that PTP1B negatively modulated the diabetic wound healing process
by dephosphorylating the endothelial cell vascular endothelial growth factor
receptor 2 and that the specific inhibitor of PTP1B might serve as a potential
novel therapeutic tool for diabetic wound healing.