Mechanism of bone induction by KUSA/A1 cells using atelocollagen honeycomb scaffold.
In order to induce new bone formation, mesenchymal stem cells were seeded onto atelocollagen honeycomb scaffold. We evaluated the mechanism of bone induction by KUSA/A1 cells combined with honeycomb atelocollagen scaffold. Scaffold alone, KUSA/A1 cells alone and with scaffold were implanted in the subcutaneous pockets of 4-week-old male SCID mice. The transplants were subjected to radiographical, histological and immunohistochemical examinations after 2 and 4 weeks of implantation. Radiographically, both KUSA/A1 cells alone and KUSA/A1-Scaffold showed some radiopaque areas formation but the latter disclosed a larger amount. Scaffold alone did not show any radiopacity. Histologically, Scaffold alone demonstrated only fibrous connective tissues in the periphery of the scaffold. KUSA/A1 cells alone showed few small islands of new bone formation surrounded by a thin layer of cellular proliferation. On the other hand, KUSA/A1-Scaffold revealed abundant new bone formation as well as cellular proliferation. We also determined the immunolocalization of type I collagen, CD34, Osteocalcin and PCNA in this newly formed bone. Our results indicated that less amount of stem cells are capable to induce the more amount of new bone in tissue engineering. This study support that atelocollagen honeycomb scaffold plays an important role in cellular anchorage and in vessel invasion, giving the precise shape and size for the new bone formation.
Hidetsugu
Tsujigiwa
T
Department of Oral Pathology and Medicine, Graduate School of Medicine and Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1 Shikata-cho, Okayama, 700-8525, Japan.
Paola
Rodriguez Andrea
RA
Hitoshi
Nagatsuka
N
Mehmet
Gunduz
G
Jin
Lee You
LY
Borkosky
Silvia S
SS
Liliana
Missana
M
Noriyuki
Nagai
N
D000818:Animals; D018952:Antigens, CD34 / Q000032:analysis; D001842:Bone and Bones / Q000502:physiology*; D002478:Cells, Cultured; D018920:Coculture Techniques / Q000379:methods*; D003094:Collagen / Q000494:pharmacology*; D024042:Collagen Type I / Q000032:analysis; D007150:Immunohistochemistry; D045164:Mesenchymal Stem Cell Transplantation; D059630:Mesenchymal Stem Cells / Q000737:chemistry / Q000187:drug effects* / Q000502:physiology; D051379:Mice; D016513:Mice, SCID; D015675:Osteocalcin / Q000032:analysis; D010012:Osteogenesis; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D023822:Tissue Engineering / Q000379:methods*
D018952:Antigens, CD34; D024042:Collagen Type I; D018809:Proliferating Cell Nuclear Antigen; C059821:atelocollagen; D015675:Osteocalcin; D003094:Collagen