title: Human PTH (1-34) induces longitudinal bone growth in rats.
abstract: The growth plate is a specialized structure that is responsible for longitudinal bone growth (LGR). Growth plate organization is altered with loading in rats. Parathyroid hormone (PTH) is known to induce mitogenic effect on chondrocytes in vitro. Type I PTH/PTH related peptide (rP) receptor is expressed in growth plate cartilage in rats. We therefore investigated the effect of PTH administration on the organization and longitudinal growth rate of the growth plate in rats. We also investigated the effect of PTH on the changes induced by unloading in the organization and growth of the growth plate. Thirty 6-week-old and 30 15-week-old male Sprague-Dawley rats were randomly assigned to five groups (n = 6 per group), i.e., basal controls, control (i.e., normally loaded), PTH-treated control (i.e., PTH-treated under normal loading), unloaded, and PTH-treated under unloading. PTH-treated animals received human PTH (1-34) at a dose of 80 microg/kg per day five times per week for 3 weeks, for the duration of unloading. In young loaded rats treated with the systemic administration of PTH, growth plate thickness, chondrocyte number, and LGR were increased in the proximal tibiae compared with findings in young loaded rats without PTH administration. Hindlimb unloading induced a reduction in growth plate thickness, chondrocyte number, and LGR. In young rats, systemic administration of PTH partly prevented these changes induced by unloading. These preventive effects of PTH were observed only in young rats; not in adult rats. These results show that the systemic administration of PTH stimulates longitudinal bone growth, and diminishes the reduction in growth plate growth induced by unloading in young rats.
authors.affiliation: Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Niigata 951-8510, Japan.
authors.forename: Taishi
authors.initials: T
authors.lastname: Ogawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamagiwa
authors.forename: Tadashi
authors.initials: T
authors.lastname: Hayami
authors.forename: Zhang
authors.initials: Z
authors.lastname: Liu
authors.forename: Kuan-Yu
authors.initials: KY
authors.lastname: Huang
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Tokunaga
authors.forename: Takehiro
authors.initials: T
authors.lastname: Murai
authors.forename: Naoto
authors.initials: N
authors.lastname: Endo
mesh_terms: D000818:Animals; D001846:Bone Development / Q000187:drug effects*; D002356:Cartilage / Q000166:cytology / Q000378:metabolism; D006132:Growth Plate / Q000166:cytology / Q000378:metabolism; D019417:Hindlimb Suspension; D006801:Humans; D008297:Male; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D019379:Teriparatide / Q000494:pharmacology*; D013977:Tibia / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism
chemical_list: D019379:Teriparatide