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Related Experiment Video

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Tacrolimus-Eluting Suture Inhibits Neointimal Hyperplasia: An Experimental In Vivo Study in Rats.

K Ak1, E Ak2, O Dericioglu3

  • 1Marmara University Faculty of Medicine, Department of Cardiovascular Surgery, Marmara Universitesi Pendik Egitim ve Arastırma Hastanesi, Ustkaynarca Pendik, Istanbul, Turkey; Eastern Mediterranean University, Faculty of Medicine, Gazimagusa, Cyprus.

European Journal of Vascular and Endovascular Surgery : the Official Journal of the European Society for Vascular Surgery
|January 10, 2017
PubMed
Summary
This summary is machine-generated.

A novel tacrolimus-chitosan-eluting suture effectively reduced neointimal hyperplasia (NIH) in a rat model. This innovative vascular graft material shows promise for preventing graft failure without hindering endothelialization.

Keywords:
Eluting sutureEndothelialisation and anastomosisNeointimal hyperplasiaTacrolimus–chitosan

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Area of Science:

  • Biomaterials Science
  • Vascular Surgery
  • Drug Delivery Systems

Background:

  • Neointimal hyperplasia (NIH) is a primary cause of vascular graft failure.
  • Cytotoxic drugs like rapamycin and tacrolimus can inhibit NIH.
  • Sustained drug release from sutures offers a potential therapeutic strategy.

Purpose of the Study:

  • To evaluate the efficacy of a sustained-release tacrolimus-chitosan-eluting suture in preventing NIH.
  • To assess the impact of this novel suture on graft healing in a rat model.

Main Methods:

  • Polyvinylidene difluoride (PVDF) sutures were coated with tacrolimus and chitosan.
  • In vitro drug release studies confirmed sustained tacrolimus elution for one month.
  • Aortotomies in Wistar rats were closed with either bare or coated sutures.
  • Histological and immunohistochemical analyses (ASMA, PCNA) were performed after one month.

Main Results:

  • The tacrolimus-chitosan suture demonstrated sustained drug release without an initial burst.
  • Significantly reduced neointimal area was observed in the tacrolimus-eluting suture group compared to controls (p=0.017).
  • A significant decrease in proliferating cell nuclear antigen (PCNA) positive cells was noted in the treated group (p=0.026).
  • Alpha-smooth muscle actin (ASMA) staining confirmed smooth muscle cell differentiation in the neointima.

Conclusions:

  • Tacrolimus-chitosan-eluting sutures effectively reduce neointimal hyperplasia.
  • This approach shows potential for improving vascular graft patency.
  • The elution strategy does not impede normal endothelialization of the anastomosis.