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. 2022 Jun;8(2):e001983.
doi: 10.1136/rmdopen-2021-001983.

Pollutants: a candidate as a new risk factor for osteoarthritis-results from a systematic literature review

Affiliations

Pollutants: a candidate as a new risk factor for osteoarthritis-results from a systematic literature review

Camille Deprouw et al. RMD Open. 2022 Jun.

Abstract

Background: Considering non-classical environmental risk factors for osteoarthritis (OA), a systematic literature review (SLR) was performed to summarise existing knowledge on associations between OA and pollutants.

Methods: PubMed was used to identify studies reporting data on OA and pollutants in humans (examples of MeSH terms: "Pesticides" or "Polychlorinated Biphenyls" or 'Lead'). Reports included epidemiological clinical studies, pollutant assessments in ex vivo OA joint, and in vitro effects of pollutants on chondrocytes.

Results: Among the 193 potentially relevant articles, 14 were selected and combined with 9 articles obtained by manual search. Among these 23 articles there were: (1) 11 epidemiological studies on the relationship between OA and pollutants exposure, (2) 8 on pollutant concentrations in ex vivo OA joint, (3) 4 on the in vitro effects of pollutants on human chondrocytes. Epidemiological studies investigating mainly chlorinated and fluorinated pollutants suggested a possible link with OA. In cross-sectional studies, radiographic knee OA prevalence increased with higher serum lead levels. There was also a relationship between serum lead levels and serum/urine joint biomarkers. A high concentration of heavy metals in the cartilage tidemark was found in ex vivo joints. In vitro, the viability of chondrocytes was reduced in presence of some pollutants. However, the level of knowledge currently remains low, justifying the need for new methodologically sound studies.

Conclusions: This SLR supports the hypothesis of a possible involvement of pollutants in OA disease risk. Large-scale epidemiological and biological studies and ideally big-data analysis are needed to confirm that pollutants could be risk factors for OA.

Keywords: chondrocytes; epidemiology; osteoarthritis.

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Conflict of interest statement

Competing interests: None declared.

Figures

Figure 1
Figure 1
Flow chart of the systematic literature review. OA, osteoarthritis.
Figure 2
Figure 2
Summary of the effects of pollutants in epidemiological clinical studies. kOA, knee osteoarthritis; NHANES, National Health and Nutrition Examination Survey; OA, osteoarthritis; OC pesticides, organo chloride pesticides; PCB, polychlorinated biphenyls; PCDD, polychlorinated dibenzo-p-dioxins; PCDF, polychlorinated dibenzofurans; PCQ, polychlorinated quarterphenyls; PFOA, perfluorooctanoate; PFOS, perfluorooctane sulfonate; serum cc, serum concentration.
Figure 3
Figure 3
Summary of pollutants data in ex vivo studies.
Figure 4
Figure 4
Summary of pollutants data in in vivo studies. ADAMTS, A Disintegrin And Metalloproteinase with Thrombospondin motifs; Bax, Bcl2 associated X protein; Bcl2, B-cell lymphoma 2; BPA, bisphenol A; E2, estradiol; LDH, lactate dehydrogenase; MMP1, mettaloproteinase 1; NFKB, nuclear factor kappa B; OA, osteoarthritis; PCB, polychlorinated biphenyl.

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