start-ver=1.4
cd-journal=joma
no-vol=37
cd-vols=
no-issue=1
article-no=
start-page=159
end-page=165
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2013
dt-pub=201301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Comparison between normal and loose fragment chondrocytes in proliferation and redifferentiation potential
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Loose fragments in osteochondritis dissecans (OCD) of the knee require internal fixation. On the other hand, loose fragments derived from spontaneous osteonecrosis of the knee (SONK) are usually removed. However, the difference in healing potential between OCD- and SONK-related loose fragments has not been elucidated. In this study, we investigated proliferative activity and redifferentiation potential of normal cartilage-derived and loose fragment-derived chondrocytes. 

Cells were prepared from normal articular cartilages and loose fragment cartilages derived from knee OCD and SONK. Cellular proliferation was compared. Redifferentiation ability of pellet-cultured chondrocytes was assessed by real-time PCR analyses. Mesenchymal differentiation potential was investigated by histological analyses. Positive ratio of a stem cell marker CD166 was evaluated in each cartilaginous tissue. 

Normal and OCD chondrocytes showed a higher proliferative activity than SONK chondrocytes. Chondrogenic pellets derived from normal and OCD chondrocytes produced a larger amount of safranin O-stained proteoglycans compared with SONK-derived pellets. Expression of chondrogenic marker genes was inferior in SONK pellets. The CD166-positive ratio was higher in normal cartilages and OCD loose fragments than in SONK loose fragments. 

The OCD chondrocytes maintained higher proliferative activity and redifferentiation potential compared with SONK chondrocytes. Our results suggest that chondrogenic properties of loose fragment-derived cells and the amount of CD166-positive cells may affect the repair process of osteochondral defects.
en-copyright=
kn-copyright=

en-aut-name=SakataKenichiro
en-aut-sei=Sakata
en-aut-mei=Kenichiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=FurumatsuTakayuki
en-aut-sei=Furumatsu
en-aut-mei=Takayuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MiyazawaShinichi
en-aut-sei=Miyazawa
en-aut-mei=Shinichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=OkadaYukimasa
en-aut-sei=Okada
en-aut-mei=Yukimasa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=FujiiMasataka
en-aut-sei=Fujii
en-aut-mei=Masataka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=OzakiToshifumi
en-aut-sei=Ozaki
en-aut-mei=Toshifumi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

affil-num=1
en-affil=
kn-affil=Okayama Univ, Dept Orthopaed Surg, Grad Sch Med Dent & Pharmaceut Sci

affil-num=2
en-affil=
kn-affil=Okayama Univ, Dept Orthopaed Surg, Grad Sch Med Dent & Pharmaceut Sci

affil-num=3
en-affil=
kn-affil=Okayama Univ, Dept Orthopaed Surg, Grad Sch Med Dent & Pharmaceut Sci

affil-num=4
en-affil=
kn-affil=Okayama Univ, Dept Orthopaed Surg, Grad Sch Med Dent & Pharmaceut Sci

affil-num=5
en-affil=
kn-affil=Okayama Univ, Dept Orthopaed Surg, Grad Sch Med Dent & Pharmaceut Sci

affil-num=6
en-affil=
kn-affil=Okayama Univ, Dept Orthopaed Surg, Grad Sch Med Dent & Pharmaceut Sci
END