Cited by 1,004Bone health and treatmentsBone Metabolism and DiseasesBone health and osteoporosis research

Bisphosphonate action: alendronate localization in rat bone and effects on osteoclast ultrastructure.

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Sato, M, Grasser, W, Endo, N, Akins, R, Simmons, H, Thompson, D D, Golub, E, Rodan, G A·1991·Journal of Clinical Investigation

Abstract

Studies of the mode of action of the bisphosphonate alendronate showed that 1 d after the injection of 0.4 mg/kg [3H]alendronate to newborn rats, 72% of the osteoclastic surface, 2% of the bone forming, and 13% of all other surfaces were densely labeled. Silver grains were seen above the osteoclasts and no other cells. 6 d later the label was 600-1,000 microns away from the epiphyseal plate and buried inside the bone, indicating normal growth and matrix deposition on top of alendronate-containing bone. Osteoclasts from adult animals, infused with parathyroid hormone-related peptide (1-34) and treated with 0.4 mg/kg alendronate subcutaneously for 2 d, all lacked ruffled border but not clear zone. In vitro alendronate bound to bone particles with a Kd of approximately 1 mM and a capacity of 100 nmol/mg at pH 7. At pH 3.5 binding was reduced by 50%. Alendronate inhibited bone resorption by isolated chicken or rat osteoclasts when the amount on the bone surface was around 1.3 x 10(-3) fmol/microns 2, which would produce a concentration of 0.1-1 mM in the resorption space if 50% were released. At these concentrations membrane leakiness to calcium was observed. These findings suggest that alendronate binds to resorption surfaces, is locally released during acidification, the rise in concentration stops resorption and membrane ruffling, without destroying the osteoclasts.

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  1. Thompson, D. D., J. G. Seedor, J. E. Fisher, M. Rosenblatt, and G. A. Rodan. 1988. Direct action ofthe parathyroid hormone-like human hypercalce- mic factor on bone. Proc. Natd. Acad. Sci. USA. 85:5673-5677.

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Authors
Sato, M., Grasser, W., Endo, N., Akins, R., Simmons, H., Thompson, D. D., Golub, E., & Rodan, G. A.
Affiliations
Merck & Co., Inc., Rahway, NJ, USA (United States) (US)
Venue
Journal of Clinical Investigation
Published
1991-12-01
Volume
88
Issue
6
Pages
2095-2105
ISSN
0021-9738 (ISSN-L)
OpenAlex
W1994414479
Cited by
1,004
References
72
Citations by year
2026: 5 · 2025: 5 · 2024: 10 · 2023: 17 · 2022: 24 · 2021: 16 · 2020: 20 · 2019: 24 · 2018: 20 · 2017: 18 · 2016: 15 · 2015: 28 · 2014: 37 · 2013: 31 · 2012: 28
FWCI
7.87
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Oncology › Bone health and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
Keywords
alendronate, bisphosphonates, osteoclasts, osteoclast ultrastructure, ruffled border, bone resorption inhibition, parathyroid hormone-related protein, acidification, growth plate
MeSH terms
Cyclic AMP, Animals, Bone and Bones, Bone Resorption, Calcium, Cells, Cultured, Chickens, Diphosphonates, Osteoclasts, Rats, Inbred Strains, Alendronate, Rats

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