title: Gene expression of procollagen alpha 1 (I) and alpha 1 (III) in partial-thickness tears of the deep pectoral tendon in chickens.
abstract: The purpose of this study was to evaluate the healing process of partial-thickness tears of the deep pectoral tendon in chickens which is considered to be equivalent to the human rotator cuff. The superior side (bursal-side) and the inferior side (joint-side) layers of the deep pectoral tendon of 80 adult chickens were lacerated in the same manner. The mRNA expression levels of alpha 1 (I) and alpha 1 (III) procollagen was at a level 2 weeks after laceration. The mRNA expression level of procollagen alpha 1 (I) was significantly higher than that of procollagen alpha 1 (III) in all experimental periods (p<0.05). The expression levels of procollagen-mRNAs were constitutively higher in bursal-side tears than in joint-side tears throughout the experimental periods (p<0.05), even 52nd weeks after laceration. These observations indicate that the bursal-side layer possesses higher healing ability than the joint-side layer in the chicken's deep pectoral tendon where subacromial impingement is absent, and that the remodeling of partial-thickness tears in chicken models needs more than one year.
authors.affiliation: Department of Orthopaedics, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamakawa
authors.forename: K
authors.initials: K
authors.lastname: Hamada
authors.forename: M
authors.initials: M
authors.lastname: Gotoh
authors.forename: K
authors.initials: K
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: K
authors.initials: K
authors.lastname: Tamaoki
authors.forename: H
authors.initials: H
authors.lastname: Fukuda
mesh_terms: D000818:Animals; D002645:Chickens; D015870:Gene Expression; D011347:Procollagen / Q000235:genetics*; D012333:RNA, Messenger / Q000378:metabolism*; D017006:Rotator Cuff / Q000473:pathology; D000070636:Rotator Cuff Injuries; D012421:Rupture; D013583:Synovial Membrane / Q000378:metabolism / Q000473:pathology; D013708:Tendon Injuries / Q000378:metabolism* / Q000473:pathology
chemical_list: D011347:Procollagen; D012333:RNA, Messenger