Cited by 173Bone Metabolism and DiseasesBone health and osteoporosis researchBone and Dental Protein Studies

Expression of RANKL and OPG correlates with age-related bone loss in male C57BL/6 mice.

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Cao, Jay, Venton, Laura, Sakata, Takeshi, Halloran, Bernard P·2003·Journal of Bone and Mineral Research

Abstract

Osteoblasts regulate the recruitment and activity of osteoclasts through expression of RANKL and osteoprotegerin (OPG). To determine whether expression of RANKL and OPG change with age and how these changes relate to the bone loss of aging, we measured bone mass and cancellous volume, and expression of RANKL, OPG, alkaline phosphatase (AP), osteocalcin (OC), and alpha I collagen (COLL) in whole bone and osteoblast-like cells in culture using 6-week- (young), 6-month- (adult), and 24-month-old (old) mice. Cancellous volume decreased by 20% from young to adult and by 52% from adult to old. RANKL mRNA levels in whole bone were 2.1-fold and 4.4-fold higher in adult and old mice, respectively, compared with young mice, whereas OPG mRNA levels decreased with age slightly. RANKL expression was negatively (r = −0.99) and OPG was positively (r = 0.92) correlated with cancellous bone volume. Expression of RANKL was higher and OPG lower in cells from older animals early in culture (day 7). With cell maturation, RANKL mRNA levels in cells from young and adult mice increased, whereas levels in cells from old animals decreased. By 21 and 28 days of culture, no differences were found in RANKL mRNA in osteoblast-like cells among different age groups. We conclude that expression of RANKL and OPG change with age in whole bone and in cultured osteoblast-like cells. These changes favor increased osteoclast over osteoblast activity, and may explain, in part, the imbalance in bone formation and resorption associated with aging.

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Crossref · 10.1359/jbmr.2003.18.2.270

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Authors
Cao, J., Venton, L., Sakata, T., & Halloran, B. P.
Affiliations
San Francisco VA Medical Center (US)
Corresponding author
Halloran, Bernard P
Venue
Journal of Bone and Mineral Research
Published
2003-02-01
Volume
18
Issue
2
Pages
270-277
ISSN
  • 0884-0431 (ISSN-L)
  • 1523-4681
OpenAlex
W1983577624
Cited by
173
References
28
Citations by year
2026: 2 · 2025: 10 · 2024: 12 · 2023: 13 · 2022: 6 · 2021: 6 · 2020: 12 · 2019: 6 · 2018: 2 · 2017: 3 · 2016: 6 · 2015: 7 · 2014: 5 · 2013: 3 · 2012: 7
FWCI
2.76
Type
journal article
Language
en
Open access
Locations
  • Journal of Bone and Mineral Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK07418-21, T32DK007418)
Topics
  • 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
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
RANKL, osteoprotegerin, age-related bone loss, bone aging, osteoblasts, osteoclasts, cancellous bone volume, bone mass, osteoblast-like cells, osteogenic differentiation, bone formation and resorption, C57BL/6 mice
MeSH terms
Aging, Animals, Body Weight, Bone and Bones, Carrier Proteins, Cells, Cultured, Glycoproteins, Male, Membrane Glycoproteins, Mice, Inbred C57BL, Osteoblasts, Osteoporosis, RNA, Messenger, Time Factors, Blotting, Western, Receptors, Tumor Necrosis Factor, Receptors, Cytoplasmic and Nuclear, Reverse Transcriptase Polymerase Chain Reaction, Mice, Osteoprotegerin, RANK Ligand, Receptor Activator of Nuclear Factor-kappa B

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