Abstract
Oxidative stress plays an important role in the pathogenesis of Hashimoto's thyroiditis. Because of the major anti-oxidant properties of black cumin, the current study aimed to evaluate the effect of powdered Nigella sativa seeds on markers of oxidative stress, endothelial dysfunction and serum lipids in patients with Hashimoto's thyroiditis. Forty patients with Hashimoto's thyroiditis, aged between 22 and 50 years old, participated in the trial and were randomly allocated into two groups of intervention and control receiving powdered N. sativa or placebo daily for 8 weeks. Changes in markers of oxidative stress, including total anti-oxidant capacity (TAC), malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GPX), and biomarkers of endothelial dysfunction including Intracellular Adhesion Molecule (ICAM)-1, Vascular Cell Adhesion Molecule (VCAM)-1 and serum lipids were also evaluated. Treatment with N. sativa, significantly increased serum TAC, SOD and reduced MDA concentrations with no significant change in GPX (P<0.05). A significant reduction in VCAM-1 (P=0.0012), body mass index (P=0.002), serum concentrations of low density lipoprotein cholesterol (P=0.002) and triglyceride (P=0.02) were also reported in N. sativa-treated group after 8 weeks; while serum high density lipoprotein cholesterol (HDL) also significantly increased (P<0.05). No change in other parameters were reported. Giving attention to the potent beneficial effects of powdered black cumin seeds in improving oxidative stress, endothelial dysfunction, serum lipids and anthropometric features in patients with Hashimoto's thyroiditis, this medicinal plant can be considered as a therapeutic agent in management of Hashimoto-related metabolic abnormalities. Iranian registry of clinical trials (registration number IRCT2015021719082N4).
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