Cited by 126Bone Metabolism and DiseasesToxic Organic Pollutants ImpactBone health and osteoporosis research

Smoke carcinogens cause bone loss through the aryl hydrocarbon receptor and induction of Cyp1 enzymes

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Iqbal, Jameel, Sun, Li, Cao, Jay, Yuen, Tony, Lu, Ping, Bab, Itai, Leu, N. Adrian, Srinivasan, Satish +5 more·2013·Proceedings of the National Academy of Sciences

Abstract

Smoking is a major risk factor for osteoporosis and fracture, but the mechanism through which smoke causes bone loss remains unclear. Here, we show that the smoke toxins benzo( a )pyrene (BaP) and 2,3,7,8-tetrachlorodibenzo- p -dioxin (TCDD) interact with the aryl hydrocarbon receptor (Ahr) to induce osteoclastic bone resorption through the activation of cytochrome P450 1a/1b (Cyp1) enzymes. BaP and TCDD enhanced osteoclast formation in bone marrow cell cultures and gavage with BaP stimulated bone resorption and osteoclastogenesis in vivo. The osteoclastogenesis triggered by BaP or RANK-L was reduced in Ahr −/− cells, consistent with the high bone mass noted in Ahr −/− male mice. The receptor activator of NF-κB ligand (RANK-L) also failed to induce the expression of Cyp1 enzymes in Ahr −/− cells. Furthermore, the osteoclastogenesis induced by TCDD was lower in Cyp1a1/1a2 −/− and Cyp1a1/1a2/1b1 −/− cultures, indicating that Ahr was upstream of the Cyp enzymes. Likewise, the pharmacological inhibition of the Cyp1 enzymes with tetramethylsilane or proadifen reduced osteoclastogenesis. Finally, deletion of the Cyp1a1 , Cyp1a2 , and Cyp1b1 in triple knockout mice resulted in reduced bone resorption and recapitulated the high bone mass phenotype of Ahr −/− mice. Overall, the data identify the Ahr and Cyp1 enzymes not only in the pathophysiology of smoke-induced osteoporosis, but also as potential targets for selective modulation by new therapeutics.

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Crossref · 10.1073/pnas.1220919110

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  • TCDD administration was unable to stimulate osteoclastogenesis in bone marrow macrophages from CYP1A1/CYP1A2 double knockout and CYP1A1/CYP1A2/CYP1B1 triple knockout mice, unlike in bone marrow macrophages from wild-type mice.

    “Moreover, TCDD administration was unable to stimulate osteoclastogenesis in bone marrow macrophages (BMMs) from CYP1A1/CYP1A2 double knockout and CYP1A1/CYP1A2/CYP1B1 triple knockout mice, unlike in BMM from wild-type mice [33].”
  • BaP and TCDD in cigarette smoke caused AhR activation and a significant increase in CYP1A1 and CYP1A2 expression, resulting in enhanced osteoclast differentiation and compromised bone mass in wild-type mice but not in AhR-/- mice.

    “Jameel et al. reported that BaP and TCDD in cigarette smoke caused AhR activation and a significant increase in CYP1A1 and CYP1A2 expression, resulting in enhanced OC differentiation and compromised bone mass in wild-type mice but not in AhR-/- mice [33].”

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Authors
Iqbal, J., Sun, L., Cao, J., Yuen, T., Lu, P., Bab, I., Leu, N. A., Srinivasan, S., Wagage, S., Hunter, C. A., Nebert, D. W., Zaidi, M., & Avadhani, N. G.
Affiliations
  • University of Pennsylvania (US)
  • Icahn School of Medicine at Mount Sinai (US)
  • United States Department of Agriculture (US)
  • The Mount Sinai Bone Program, Mount Sinai School of Medicine, New York, NY 10029;
  • Hebrew University of Jerusalem (IL)
  • Departments of aAnimal Biology and
  • Pathobiology, School of Veterinary Medicine, and
  • University of Cincinnati Medical Center (US)
Venue
Proceedings of the National Academy of Sciences
Published
2013-06-17
Volume
110
Issue
27
Pages
11115-11120
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2079795497
Cited by
126
References
36
Citations by year
2026: 5 · 2025: 10 · 2024: 6 · 2023: 8 · 2022: 12 · 2021: 8 · 2020: 15 · 2019: 8 · 2018: 12 · 2017: 10 · 2016: 6 · 2015: 11 · 2014: 14 · 2013: 1
FWCI
4.77
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging (R01AG040132, AG-23176, AG40132, R01AG023176)
  • National Cancer Institute (CA22763, P30CA016520)
  • National Institute of General Medical Sciences (R01GM034883, GM 34883)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK80459, R01DK080459)
  • National Institute of Environmental Health Sciences (ES014403, P30ES006096, R01ES008147, R01ES014403, P30 ES-06096, ES-08147)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
Keywords
smoking, osteoporosis, bone loss, aryl hydrocarbon receptor, benzo[a]pyrene, TCDD, osteoclastogenesis, bone resorption, RANKL, tetramethylsilane, proadifen, bone mass
MeSH terms
Polychlorinated Dibenzodioxins, Animals, Aryl Hydrocarbon Hydroxylases, Benzo(a)pyrene, Bone Resorption, Carcinogens, Disease Models, Animal, Enzyme Induction, Female, Humans, Male, Mice, Inbred C57BL, Smoke, Smoking, Nicotiana, Receptors, Aryl Hydrocarbon, Mice, Knockout, Cytochrome P-450 CYP1A1, Cytochrome P-450 CYP1A2, Mice, Cytochrome P-450 CYP1B1

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