Greater magnitude of turnover suppression occurs earlier after treatment initiation with risedronate than alendronate

Matthew Allen, John J. Turek, Roger J. Phipps, David Burr

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Clinical data suggest that reductions in fractures associated with osteoporosis may occur sooner in patients treated with risedronate (RIS) compared to those treated with alendronate (ALN). This could be explained by differences in the time course of turnover suppression between these two bisphosphonates. To determine if differences in the onset of turnover suppression exist between RIS and ALN, female New Zealand white rabbits (total n = 32) were treated with clinically relevant doses of RIS or ALN and then administered different fluorochrome labels weekly for four weeks in order to allow histological assessment of the time-course of turnover suppression. By the third week of treatment vertebral trabecular bone formation rate (BFR/BS) was significantly suppressed with RIS-treatment compared to both VEH and ALN. By the 4th week of treatment, turnover rates in RIS-treated animals remained significantly lower than in VEH-treated animals and were also lower than ALN; at this time-point ALN was significantly lower than VEH. There was no significant reduction in intra-cortical remodeling in the tibial mid-diaphysis at any time point for either RIS or ALN. This greater effect on turnover suppression with RIS early in treatment compared to ALN is likely the result of both risedronate's greater potency on osteoclast inhibition and its lower binding affinity. Together with studies showing more rapid return toward baseline turnover following withdrawal of RIS compared to ALN, this pre-clinical study provides evidence of the differences between bisphosphonates with respect to onset and recovery of bone turnover suppression.

Original languageEnglish
Pages (from-to)128-132
Number of pages5
JournalBone
Volume49
Issue number1
DOIs
StatePublished - Jul 2011

Fingerprint

Alendronate
Therapeutics
Diphosphonates
Risedronate Sodium
Diaphyses
Fracture Fixation
Bone Remodeling
Osteoclasts
Fluorescent Dyes
Osteogenesis
Osteoporosis
Rabbits

Keywords

  • Bisphosphonates
  • Bone remodeling
  • Histomorphometry
  • Rabbit model

ASJC Scopus subject areas

  • Physiology
  • Endocrinology, Diabetes and Metabolism
  • Histology

Cite this

Greater magnitude of turnover suppression occurs earlier after treatment initiation with risedronate than alendronate. / Allen, Matthew; Turek, John J.; Phipps, Roger J.; Burr, David.

In: Bone, Vol. 49, No. 1, 07.2011, p. 128-132.

Research output: Contribution to journalArticle

Allen, Matthew ; Turek, John J. ; Phipps, Roger J. ; Burr, David. / Greater magnitude of turnover suppression occurs earlier after treatment initiation with risedronate than alendronate. In: Bone. 2011 ; Vol. 49, No. 1. pp. 128-132.
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