title: Biodegradable polymer with collagen microsponge serves as a new bioengineered cardiovascular prosthesis.
abstract: OBJECTIVE
  Biodegradable materials with autologous cell seeding have attracted much interest as potential cardiovascular grafts. However, pretreatment of these materials requires a complicated and invasive procedure that carries the risk of infection. To avoid these problems, we sought to develop a biodegradable graft material containing collagen microsponge that would permit the regeneration of autologous vessel tissue. The ability of this material to accelerate in situ cellularization with autologous endothelial and smooth muscle cells was tested with and without precellularization.
  
  
  METHODS
  Poly(lactic-co-glycolic acid) as a biodegradable scaffold was compounded with collagen microsponge to form a vascular patch material. These poly(lactic-co-glycolic acid)-collagen patches with (n = 10) or without (n = 10) autologous vessel cellularization were used to patch the canine pulmonary artery trunk. Histologic and biochemical assessments were performed 2 and 6 months after the implantation.
  
  
  RESULTS
  There was no thrombus formation in either group, and the poly(lactic-co-glycolic acid) scaffold was almost completely absorbed in both groups. Histologic results showed the formation of an endothelial cell monolayer, a parallel alignment of smooth muscle cells, and reconstructed vessel wall with elastin and collagen fibers. The cellular and extracellular components in the patch had increased to levels similar to those in native tissue at 6 months.
  
  
  CONCLUSIONS
  The poly(lactic-co-glycolic acid)-collagen microsponge patch with and without precellularization showed good histologic findings and durability. This patch shows promise as a bioengineered material for promoting in situ cellularization and the regeneration of autologous tissue in cardiovascular surgery.
authors.affiliation: Division of Cardiovascular Surgery, Department of Surgery, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Shigemitsu
authors.initials: S
authors.lastname: Iwai
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Sawa
authors.forename: Hajime
authors.initials: H
authors.lastname: Ichikawa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Taketani
authors.forename: Eiichiro
authors.initials: E
authors.lastname: Uchimura
authors.forename: Guoping
authors.initials: G
authors.lastname: Chen
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hara
authors.forename: Jun
authors.initials: J
authors.lastname: Miyake
authors.forename: Hikaru
authors.initials: H
authors.lastname: Matsuda
mesh_terms: D000818:Animals; D001673:Biodegradation, Environmental; D001808:Blood Vessels; D002478:Cells, Cultured; D003094:Collagen; D004285:Dogs; D006016:Glycolates; D019344:Lactic Acid; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D019736:Prostheses and Implants; D011474:Prosthesis Design; D015503:Surgical Sponges; D023822:Tissue Engineering
chemical_list: D006016:Glycolates; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D003094:Collagen