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Horm Metab Res 2002; 34(6): 293-302
DOI: 10.1055/s-2002-33257
Original Basic
© Georg Thieme Verlag Stuttgart · New York

Anabolic Effects of Recombinant Human Parathyroid Hormone (1 - 84) and Synthetic Human Parathyroid Hormone (1 - 34) on the Mandibles of Osteopenic Ovariectomized Rats with Maxillary Molar Extraction

T.  Kawane 1 , S.  Takahashi 1 , H.  Saitoh 2 , H.  Okamoto 1 , N.  Kubodera 2 , N.  Horiuchi 1
  • 1Departments of Biochemistry and Periodontics, Ohu University School of Dentistry, Koriyama, Japan
  • 2Fuji Gotemba Research Laboratory, Chugai Parmaceutical, Gotemba, Japan
Weitere Informationen

Publikationsverlauf

Received 18 June 2001

Accepted after Revision 25 February 2002

Publikationsdatum:
12. August 2002 (online)

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Abstract

In rodent osteoporosis models such as ovariectomized (OVX) rats, intermittently administered human parathyroid hormone (hPTH) has an anabolic effect in vertebrae and long bones. In the present experiments, subcutaneously injected hPTH(1 - 34) or hPTH(1 - 84) dose- and time-dependently increased bone mineral density (BMD) as measured by dual energy X-ray absorptiometry in mandibles, L2 to L4 vertebrae and femurs of such rats. The highest dose (15.9 nmol/kg, s. c.) of either peptide given four times weekly for 10 weeks completely reversed the effects of overiectomy on BMD. Significant elevation in lumbar BMD after 10 weeks was observed with hPTH(1 - 34) or hPTH(1 - 84) at 1.1 nmol/kg, whereas hPTH(1 - 34) at 1.1 and 4.2 nmol/kg significantly increased BMD of the whole bone and the metaphysis of the femur and the diaphysis of the bone, respectively. In contrast, significant effects of hPTH(1 - 84) administration on BMD increase in the femur were observed at 4.2 and 15.9 nmol/kg in the whole bone and the metaphysis, and in the diaphysis, respectively. Maxillary molar extraction left mandibular BMD in rats with intact ovaries unchanged, but significantly decreased mandibular BMD in OVX rats. Administration of hPTH(1 - 84) for 10 weeks in OVX rats without or with extraction significantly increased BMD in the mandibular molar region at doses of 15.9 and 4.2 nmol/kg, respectively, indicating that efficacy was increased by extraction. A significant BMD increase in the molar region in OVX rats with extraction occurred at only 1.1 nmol/kg of hPTH(1 - 34) and 4.2 nmol/kg of hPTH(1 - 84). Also, BMD of the ramus region was increased by administration of both peptides to a lesser extent than that of the molar region in these rats. Thus, intermittent administration of hPTH, especially hPTH(1 - 34), has an anabolic effect on bone, particularly alveolar bone. Such treatment may increase alveolar bone mass in postmenopausal women with osteoporosis.

Key words

Intermittent Administration - Bone Mineral Density - Bone Formation - Osteoporosis

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N. Horiuchi, D.D.S., Ph.D.

Department of Biochemistry,

Ohu University School of Dentistry

Koriyama 963-8611 · Japan

Fax: + 81 (249) 38-91 92

eMail: fwga 4746@mb.infoweb.ne.jp