Effects of vitamin K2 and risedronate on bone formation and resorption, osteocyte lacunar system, and porosity in the cortical bone of glucocorticoid-treated rats

Jun Iwamoto, Hideo Matsumoto, Tsuyoshi Takeda, Yoshihiro Sato, Xiaoqing Liu, James K. Yeh

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The purpose of the present study was to examine the effects of vitamin K2 and risedronate on bone formation and resorption, the osteocyte lacunar system, and porosity in the cortical bone of glucocorticoid (GC)-treated rats. Forty-nine female Sprague-Dawley rats, 3 months of age, were randomized into five groups according to the following treatment schedule: age-matched control, GC administration, and GC administration with concomitant administration of vitamin K2, risedronate, or vitamin K2 + risedronate. At the end of the 8-week experiment, classical bone histomorphometric analysis was performed, and the osteocyte lacunar system and porosity were evaluated on the cortical bone of the tibial diaphysis. GC administration decreased percent cortical bone area and increased percent marrow area as a result of decreased periosteal bone formation, and increased endocortical bone erosion, and increased cortical porosity. Vitamin K 2 prevented a reduction in periosteal bone formation but did not affect percent cortical bone and marrow areas. Risedronate prevented a reduction in periosteal bone formation and an increase in endocortical bone erosion, resulting in prevention of alterations in percent cortical bone and marrow areas. Both vitamin K2 and risedronate increased osteocyte density and lacunar occupancy and prevented a GC-induced increase in cortical porosity. Vitamin K2 and risedronate had additive effects on osteocyte density and lacunar occupancy and a synergistic effect on cortical porosity. The present study showed the efficacy of vitamin K2 and risedronate for bone formation and resorption, the osteocyte lacunar system, and porosity in the cortical bone of GC-treated rats.

Original languageEnglish
Pages (from-to)121-128
Number of pages8
JournalCalcified Tissue International
Volume83
Issue number2
DOIs
Publication statusPublished - 2008 Aug

Fingerprint

Vitamin K 2
Osteocytes
Porosity
Bone Resorption
Osteogenesis
Glucocorticoids
Bone Marrow
Bone and Bones
Diaphyses
Risedronate Sodium
Cortical Bone
Sprague Dawley Rats
Appointments and Schedules

Keywords

  • Glucocorticoid
  • Lacunar
  • Osteocyte
  • Risedronate
  • Vitamin K

ASJC Scopus subject areas

  • Endocrinology

Cite this

Effects of vitamin K2 and risedronate on bone formation and resorption, osteocyte lacunar system, and porosity in the cortical bone of glucocorticoid-treated rats. / Iwamoto, Jun; Matsumoto, Hideo; Takeda, Tsuyoshi; Sato, Yoshihiro; Liu, Xiaoqing; Yeh, James K.

In: Calcified Tissue International, Vol. 83, No. 2, 08.2008, p. 121-128.

Research output: Contribution to journalArticle

Iwamoto, Jun ; Matsumoto, Hideo ; Takeda, Tsuyoshi ; Sato, Yoshihiro ; Liu, Xiaoqing ; Yeh, James K. / Effects of vitamin K2 and risedronate on bone formation and resorption, osteocyte lacunar system, and porosity in the cortical bone of glucocorticoid-treated rats. In: Calcified Tissue International. 2008 ; Vol. 83, No. 2. pp. 121-128.
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