title: Localization of pigment epithelium-derived factor in growing mouse bone.
abstract: Pigment epithelium-derived factor (PEDF) is a potent anti-angiogenic factor found in a wide range of fetal and adult tissues, where it is thought to play a role in the regulation of angiogenesis during development. The temporal expression of PEDF during endochondral bone formation has not previously been reported. In this study, we analysed the expression pattern of PEDF in growing mouse hindlimbs from newborn day one through to maturation at week 9, using immunohistochemistry and in situ hybridization. PEDF expression was demonstrated in chondrocytes within the resting, proliferative and upper hypertrophic zones of the epiphyseal growth plate. The pattern of expression was consistent throughout the developmental stages of the mouse. In addition, PEDF was expressed by osteoblasts lining the bone spicules in the ossification zone of metaphyseal bone, as well as by osteoblasts lining cortical periosteum. These novel results demonstrate that PEDF is developmentally expressed in both cartilage and bone cells during endochondral bone formation, and strongly suggest that it may play a regulatory role in the processes of chondrocyte and osteoblast differentiation, endochondral ossification, and bone remodelling during growth and development of long bones.
authors.affiliation: Department of Orthopaedics, University of Melbourne, St. Vincent's Hospital Melbourne, Fitzroy 3065, Australia.
authors.forename: Gerald M Y
authors.initials: GM
authors.lastname: Quan
authors.forename: Joseline
authors.initials: J
authors.lastname: Ojaimi
authors.forename: Yaping
authors.initials: Y
authors.lastname: Li
authors.forename: Vicky
authors.initials: V
authors.lastname: Kartsogiannis
authors.forename: Hong
authors.initials: H
authors.lastname: Zhou
authors.forename: Peter F M
authors.initials: PF
authors.lastname: Choong
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001846:Bone Development / Q000502:physiology*; D016723:Bone Remodeling / Q000502:physiology; D019902:Chondrocytes / Q000378:metabolism; D005136:Eye Proteins / Q000235:genetics / Q000378:metabolism*; D006132:Growth Plate / Q000378:metabolism*; D006614:Hindlimb; D007124:Immunoenzyme Techniques; D017403:In Situ Hybridization; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D009414:Nerve Growth Factors / Q000235:genetics / Q000378:metabolism*; D010006:Osteoblasts / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D015843:Serpins / Q000235:genetics / Q000378:metabolism*; D013977:Tibia / Q000033:anatomy & histology / Q000378:metabolism*; D000099174:Pigment Epithelium-Derived Factor
chemical_list: D005136:Eye Proteins; D009414:Nerve Growth Factors; D012333:RNA, Messenger; D015843:Serpins; D000099174:Pigment Epithelium-Derived Factor