title: Development of a new ELISA for serum periostin: evaluation of growth-related changes and bisphosphonate treatment in mice.
abstract: Periostin is a gamma-carboxyglutamic acid protein preferentially expressed in periosteum and bone mesenchymal stem cells. Lack of a precise assay for measuring circulating levels impairs the investigation of its biological significance. We developed a new ELISA and studied changes of periostin levels both locally at the bone site and systemically in circulating blood during growth and after bisphosphonate-induced inhibition of bone remodeling in the mouse. The ELISA we developed is based on an affinity-purified polyclonal antibody that was raised against the C-terminal sequence of mouse periostin. Reproducibility, repeatability, precision, and accuracy tests met standards of acceptance. Serum periostin and levels of the bone turnover markers osteocalcin, PINP, CTX-I, and TRAP5b were measured in (1) 4-, 6-, 8-, 10-, and 12-week-old wild-type female Balb/c mice and (2) adult ovariectomized female Balb/c mice treated with zoledronic acid or vehicle. Serum periostin decreased during growth and stabilized from 8 weeks and older, its levels correlating with bone turnover markers. Immunohistochemistry in bones from different growth stages showed that periostin localized specifically at the sites of endochondral and intramembranous ossification, especially at the periosteal envelopes. Zoledronic acid induced a marked decrease in bone remodeling markers but did not alter serum periostin levels or periostin immunostaining pattern. The novel ELISA is highly specific and allows accurate and precise measurements of serum periostin levels in mice.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale, Lyon, France.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Contié
authors.forename: Nathalie
authors.initials: N
authors.lastname: Voorzanger-Rousselot
authors.forename: Judith
authors.initials: J
authors.lastname: Litvin
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bonnet
authors.forename: Serge
authors.initials: S
authors.lastname: Ferrari
authors.forename: Philippe
authors.initials: P
authors.lastname: Clézardin
authors.forename: Patrick
authors.initials: P
authors.lastname: Garnero
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D050071:Bone Density Conservation Agents / Q000494:pharmacology*; D016723:Bone Remodeling / Q000187:drug effects / Q000502:physiology; D015815:Cell Adhesion Molecules / Q000097:blood* / Q000276:immunology; D024042:Collagen Type I / Q000378:metabolism; D004164:Diphosphonates / Q000494:pharmacology*; D004195:Disease Models, Animal; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D005260:Female; D019085:Fluorescent Antibody Technique, Direct; D007093:Imidazoles / Q000494:pharmacology*; D007124:Immunoenzyme Techniques; D007527:Isoenzymes / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D010052:Ovariectomy; D010446:Peptide Fragments / Q000378:metabolism; D010455:Peptides / Q000378:metabolism; D011347:Procollagen / Q000378:metabolism; D015203:Reproducibility of Results; D000071681:Tartrate-Resistant Acid Phosphatase; D013977:Tibia / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D000077211:Zoledronic Acid
chemical_list: D015415:Biomarkers; D050071:Bone Density Conservation Agents; D015815:Cell Adhesion Molecules; D024042:Collagen Type I; D004164:Diphosphonates; D007093:Imidazoles; D007527:Isoenzymes; D010446:Peptide Fragments; D010455:Peptides; C082838:Postn protein, mouse; D011347:Procollagen; C052929:collagen type I trimeric cross-linked peptide; C047202:procollagen Type I N-terminal peptide; D000077211:Zoledronic Acid; D000135:Acid Phosphatase; D000071681:Tartrate-Resistant Acid Phosphatase