title: Attenuation of thrombosis and bacterial infection using dual function nitric oxide releasing central venous catheters in a 9day rabbit model.
abstract: Two major problems with implanted catheters are clotting and infection. Nitric oxide (NO) is an endogenous vasodilator as well as natural inhibitor of platelet adhesion/activation and an antimicrobial agent, and NO-releasing polymers are expected to have similar properties. Here, NO-releasing central venous catheters (CVCs) are fabricated using Elast-eon™ E2As polymer with both diazeniumdiolated dibutylhexanediamine (DBHD/NONO) and poly(lactic-co-glycolic acid) (PLGA) additives, where the NO release can be modulated and optimized via the hydrolysis rate of the PLGA. It is observed that using a 10% w/w additive of a PLGA with ester end group provides the most controlled NO release from the CVCs over a 14d period. The optimized DBHD/NONO-based catheters are non-hemolytic (hemolytic index of 0%) and noncytotoxic (grade 0). After 9d of catheter implantation in the jugular veins of rabbits, the NO-releasing CVCs have a significantly reduced thrombus area (7 times smaller) and a 95% reduction in bacterial adhesion. These results show the promise of DBHD/NONO-based NO releasing materials as a solution to achieve extended NO release for longer term prevention of clotting and infection associated with intravascular catheters.
  
  
  
  Clotting and infection are significant complications associated with central venous catheters (CVCs). While nitric oxide (NO) releasing materials have been shown to reduce platelet activation and bacterial infection in vitro and in short-term animal models, longer-term success of NO-releasing materials to further study their clinical potential has not been extensively evaluated to date. In this study, we evaluate diazeniumdiolate based NO-releasing CVCs over a 9d period in a rabbit model. The explanted NO-releasing CVCs were found to have significantly reduced thrombus area and bacterial adhesion. These NO-releasing coatings can improve the hemocompatibility and bactericidal activity of intravascular catheters, as well as other medical devices (e.g., urinary catheters, vascular grafts).
authors: Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA.
authors: Elizabeth J
authors: EJ
authors: Brisbois
authors: Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA.
authors: Terry C
authors: TC
authors: Major
authors: Biological Engineering, College of Engineering, University of Georgia, Athens, GA, USA.
authors: Marcus J
authors: MJ
authors: Goudie
authors: Department of Chemistry, University of Michigan, Ann Arbor, MI, USA.
authors: Mark E
authors: ME
authors: Meyerhoff
authors: Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA.
authors: Robert H
authors: RH
authors: Bartlett
authors: Biological Engineering, College of Engineering, University of Georgia, Athens, GA, USA. Electronic address: hhanda@uga.edu.
authors: Hitesh
authors: H
authors: Handa
mesh_terms: D000818:Animals; D001422:Bacterial Adhesion; D001424:Bacterial Infections / Q000150:complications / Q000382:microbiology / Q000517:prevention & control*; D062905:Central Venous Catheters / Q000382:microbiology; D015169:Colony Count, Microbial; D003959:Diamines / Q000737:chemistry; D006461:Hemolysis; D019344:Lactic Acid / Q000737:chemistry; D009569:Nitric Oxide / Q000378:metabolism*; D011100:Polyglycolic Acid / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011817:Rabbits; D013927:Thrombosis / Q000150:complications / Q000517:prevention & control*
chemical_list: D003959:Diamines; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D009569:Nitric Oxide; D019344:Lactic Acid; C041565:N,N'-dibutyl-1,6-hexanediamine
keywords: Antibacterial; Catheters; Hemocompatibility; Nitric oxide; Poly (lactide-co-glycolide)