The Protective Effects of Botulinum Toxin A Against Flap Necrosis After Perforator Twisting and Its Underlying Molecular Mechanism in a Rat Model.

Abstract:

PURPOSE:The purpose of this study was to examine our hypotheses that botulinum toxin A (BoTA) protect necrosis of perforator flap from perforator twisting. METHODS:Twenty-four rats were randomly divided into 2 groups. Twelve International Units of BoTA versus 1.2 mL normal saline was injected subdermally 3 days before flap elevation. In each group, bilateral before deep inferior epigastric perforator (DIEP) flaps, 5 × 3 cm in size, were created. The right and left (180 and 360 degrees of perforator twisting) DIEP flaps were separated. At 1 and 3 days postoperatively, skin above the perforator of the DIEP flaps was harvested to examine the degrees of gene expressions. Final survival percentage of flap and histology were assessed at postoperative day 5. RESULTS:The survival percentage of flap was significantly higher in the BoTA group than in the control group at both DIEP flaps after 180 and 360 degrees of perforator twisting at postoperative day 5 (95.23 ± 2.85% vs 91.00 ± 3.77%; P = 0.021 and 91.59 ± 2.87% vs 30.03 ± 6.91%; P < 0.001, respectively).Higher fibroblast density, enhanced epithelial necrosis, and inflammation were noted in the control group than in the BoTA group. In 180 degrees of perforator twisting group, BoTA may augment angiogenesis possibly via nuclear factor-κB-induced destabilization and the nuclear factor-κB/hypoxia-inducible factor 1-α/vascular endothelial growth factor pathway, whereas in the 360 degrees of perforator twisting group, the mechanistic target of rapamycin/hypoxia-inducible factor 1-α/vascular endothelial growth factor pathway may participate in BoTA-induced effective angiogenesis. CONCLUSIONS:We demonstrated that pretreatment with BoTA protects perforator flap caused by perforator at the pathological and molecular level using an experimental rat model.

journal_name

Ann Plast Surg

authors

Kim SY,Lee SH,Lee B,Park YJ,Park JH,Lee YS,Rah DK,Park TH

doi

10.1097/SAP.0000000000000563

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

242-8

issue

2

eissn

0148-7043

issn

1536-3708

journal_volume

77

pub_type

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