title: Thyroid hormones and antioxidant systems: focus on oxidative stress in cardiovascular and pulmonary diseases.
abstract: In previous works we demonstrated an inverse correlation between plasma Coenzyme Q10 (CoQ10) and thyroid hormones; in fact, CoQ10 levels in hyperthyroid patients were found among the lowest detected in human diseases. On the contrary, CoQ10 is elevated in hypothyroid subjects, also in subclinical conditions, suggesting the usefulness of this index in assessing metabolic status in thyroid disorders. A Low-T3 syndrome is a condition observed in several chronic diseases: it is considered an adaptation mechanism, where there is a reduction in pro-hormone T4 conversion. Low T3-Syndrome is not usually considered to be corrected with replacement therapy. We review the role of thyroid hormones in regulation of antioxidant systems, also presenting data on total antioxidant capacity and Coenzyme Q10. Published studies suggest that oxidative stress could be involved in the clinical course of different heart diseases; our data could support the rationale of replacement therapy in low-T3 conditions.
authors.affiliation: Department of Medical Sciences, Division of Endocrinology, Catholic University, Rome 00168, Italy;. mancini.giac@mclink.it.
authors.forename: Antonio
authors.initials: A
authors.lastname: Mancini
authors.forename: Sebastiano
authors.initials: S
authors.lastname: Raimondo
authors.forename: Chantal
authors.initials: C
authors.lastname: Di Segni
authors.forename: Mariasara
authors.initials: M
authors.lastname: Persano
authors.forename: Giovanni
authors.initials: G
authors.lastname: Gadotti
authors.forename: Andrea
authors.initials: A
authors.lastname: Silvestrini
authors.forename: Roberto
authors.initials: R
authors.lastname: Festa
authors.forename: Luca
authors.initials: L
authors.lastname: Tiano
authors.forename: Alfredo
authors.initials: A
authors.lastname: Pontecorvi
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Meucci
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000378:metabolism*; D002318:Cardiovascular Diseases / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D006980:Hyperthyroidism / Q000378:metabolism / Q000473:pathology; D008171:Lung Diseases / Q000378:metabolism* / Q000473:pathology; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000378:metabolism; D013963:Thyroid Hormones / Q000097:blood / Q000378:metabolism*; D014451:Ubiquinone / Q000031:analogs & derivatives / Q000097:blood
chemical_list: D000975:Antioxidants; D017382:Reactive Oxygen Species; D013963:Thyroid Hormones; D014451:Ubiquinone; C024989:coenzyme Q10