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Optimized delivery system achieves enhanced endomyocardial stem cell retention.

Atta Behfar1, Jean-Pierre Latere, Jozef Bartunek

  • 1From Division of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic, Rochester, MN (A.B., R.J.C.-D., P.G.S., M.M.R., A.T.); Cardio3 BioSciences, Mont-Saint-Guibert, Belgium (J.-P.L., C.H., D.D., V.S., A.S.); and Cardiovascular Center, OLV Ziekenhuis, Aalst, Belgium (J.B.).

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Summary

A novel curved needle delivery system significantly improves stem cell retention in the heart. This innovation enhances regenerative therapies by ensuring more delivered cells remain at the target site for better therapeutic outcomes.

Keywords:
cathetersmyocardial infarctionregenerationstem cells

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Cardiovascular Research

Background:

  • Limited myocardial retention of delivered stem cells hinders regenerative therapies.
  • Developing effective cell delivery systems is crucial for enhancing treatment efficacy.

Purpose of the Study:

  • To engineer an endocardial delivery system for improved stem cell retention in the myocardium.
  • To optimize needle design through in silico modeling and experimental validation.

Main Methods:

  • In silico modeling of tissue distortion and compliance to predict optimal needle design.
  • Engineering nitinol-based curved needles with graded side holes.
  • Biocompatibility testing with human mesenchymal stem cells.
  • In vitro and in vivo validation using porcine heart models and percutaneous delivery in infarcted pigs.

Main Results:

  • A 75°-curved needle design with graded side holes was predicted to maximize cell retention.
  • The nitinol curved needle catheter (C-Cath) demonstrated 3-fold superior stem cell retention compared to standard needles in isolated hearts.
  • Percutaneous delivery in infarcted pigs showed significantly higher cell retention (37.7±7.1%) with C-Cath versus traditional needles (10.0±2.8%).
  • The delivery system showed no adverse effects on biocompatibility or safety.

Conclusions:

  • Modeling-guided development successfully created a nitinol-based curved needle system.
  • The enhanced delivery system significantly improves myocardial stem cell retention.
  • This technology holds promise for advancing regenerative cell-based therapies for cardiac conditions.