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Antioxidant effects of β-carotene, but not of retinol and vitamin E, in orbital fibroblasts from patients with Graves’ orbitopathy (GO)

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Abstract

Background

Oxidative stress is involved in the pathogenesis of Graves’ orbitopathy (GO) and several antioxidant agents, namely, selenium, quercetin, enalapril, vitamin C, N-acetyl-l-cysteine, and melatonin, have been shown to reduce oxidative stress and its consequences in primary culture of orbital fibroblasts. In addition, selenium is effective for the treatment of mild GO. Here, we investigated the action of three additional antioxidants in orbital fibroblasts, namely, retinol, β-carotene, and vitamin E.

Methods

Primary cultures of orbital fibroblasts were established from GO patients and control subjects. To induce oxidative stress, cells were treated with H2O2, after which glutathione disulfide (GSSG) (a parameter of oxidative stress), cell proliferation, hyaluronic acid, TNFα, IFNγ, and IL1β were measured.

Results

H2O2-dependent oxidative stress (augmented GSSG) was associated with increased cell proliferation and cytokine release. All the three antioxidant substances reduced GSSG in both GO and control fibroblasts. β-carotene reduced proliferation in GO, but not in control fibroblasts. IL1β was reduced by all three substances. Retinol reduced IFNγ in GO and control fibroblasts.

Conclusions

Our study supports an antioxidant role of retinol, β-carotene, and vitamin E in orbital fibroblasts from patients with GO and provides a basis for a possible clinical use these substances.

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Authors and Affiliations

  1. Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy

    G. Rotondo Dottore, I. Ionni, F. Menconi, P. Vitti, C. Marcocci & M. Marinò

  2. Ophthalmopathy Unit I, Department of Surgical, Medical and Molecular Pathology, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy

    G. Casini & M. Nardi

  3. ENT Unit I, Department of Surgical, Medical and Molecular Pathology, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy

    S. Sellari-Franceschini

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  1. G. Rotondo Dottore
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  2. I. Ionni
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  7. P. Vitti
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  8. C. Marcocci
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  9. M. Marinò
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Correspondence to M. Marinò.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Rotondo Dottore, G., Ionni, I., Menconi, F. et al. Antioxidant effects of β-carotene, but not of retinol and vitamin E, in orbital fibroblasts from patients with Graves’ orbitopathy (GO). J Endocrinol Invest 41, 815–820 (2018). https://doi.org/10.1007/s40618-017-0809-5

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