title: Osteoinductive effect of bone bank allografts on human osteoblasts in culture.
abstract: Incorporation of a human bone allograft requires osteoclast activity and growth of recipient osteoblasts. The aim of this work was to study the effects produced by autoclavated and -80 degrees C frozen bone allografts on osteoblast proliferation and synthesis of interleukin 6 (IL6), activator of bone resorption, aminoterminal propeptide of procollagen I (PINP), marker of bone matrix formation, and osteoprotegerin (OPG), inhibitor of osteoclast activity and differentiation. Allografts were obtained from human femoral heads. Human osteoblasts were cultured in the presence (problem group) or in the absence (control group) of allografts during 15 days. Allografts produced a decrease in osteoblast proliferation in the first week of the experiment, and an increase in IL6 mRNA, both at 3 h and 2 days, and an increase in the IL6 released to the culture medium the second day of the experiment. We found a decrease in OPG released to the culture on the 2nd and fourth days. These results suggest an increase in bone resorption and a decrease in bone formation in the first week of the experiment. In the second week, allografts produced an increase in osteoblast proliferation and PINP release to the culture medium, indicating an increase in bone formation; an increase in OPG released to the culture medium, which would indicate a decrease in bone resorption; and a decrease in IL6, indicating a decrease in bone resorption stimulation. These results demonstrate that autoclavated and -80 degrees C frozen bone allografts produce in bone environment changes that regulate their own incorporation to the recipient bone.
authors.affiliation: Fundación Jiménez Díaz, Laboratorio de Fisiopatología Osea, Avenida Reyes Católicos 2, 28040 Madrid, Spain. cpiedra@fjd.es
authors.forename: Concepción
authors.initials: C
authors.lastname: de la Piedra
authors.forename: Carlos
authors.initials: C
authors.lastname: Vicario
authors.forename: Lucrecia Rodríguez
authors.initials: LR
authors.lastname: de Acuña
authors.forename: Carmen
authors.initials: C
authors.lastname: García-Moreno
authors.forename: Maria Luisa
authors.initials: ML
authors.lastname: Traba
authors.forename: Santiago
authors.initials: S
authors.lastname: Arlandis
authors.forename: Fernando
authors.initials: F
authors.lastname: Marco
authors.forename: Luis
authors.initials: L
authors.lastname: López-Durán
mesh_terms: D000368:Aged; D018586:Bone Banks; D001862:Bone Resorption; D016025:Bone Transplantation; D018929:Cell Culture Techniques / Q000379:methods*; D002454:Cell Differentiation; D049109:Cell Proliferation; D003470:Culture Media / Q000378:metabolism; D005260:Female; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism; D008875:Middle Aged; D008954:Models, Biological; D010006:Osteoblasts / Q000166:cytology* / Q000378:metabolism; D010012:Osteogenesis; D053244:Osteoprotegerin / Q000378:metabolism; D011347:Procollagen / Q000737:chemistry; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D003470:Culture Media; D015850:Interleukin-6; D053244:Osteoprotegerin; D011347:Procollagen; D012333:RNA, Messenger