Selenium deficiency in rats for a period of up to 6 weeks inhibited both the production of 3,3',5-tri-iodothyronine (T3) from thyroxine (T4) (5'-deiodination) and also the catabolism of T3 to 3,3'-di-iodothyronine (5-deiodination) in liver homogenates. The hepatic stores of T3 were decreased by only 8% in selenium deficiency, despite the T3 production rate from T4 being only 7% of the rate found in selenium-supplemented rats. Hepatic glutathione S-transferase (GST) activity was increased in both hypothyroidism and selenium deficiency, but apparently by different mechanisms, since mRNA expression for this family of enzymes was lowered by hypothyroidism and increased in selenium deficiency. It is concluded that, since both T3 production and catabolism are inhibited by selenium deficiency, there is little change in hepatic T3 stores, and therefore the changes in the activity of certain hepatic enzymes, such as GST, that are found in selenium deficiency are not the result of tissue hypothyroidism.

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Nardostachys jatamansi DC. is an endangered, primitive and therapeutic herbal agent belonging to family Valerianaceae. The rhizomes of this hairy, perennial, dwarf and herbaceous plant are used for therapeutic effect in ayurvedic and unani system of medicine. Nardostachys jatamansi has been reported to have many therapeutic activities like antifungal, antimicrobial, antioxidant, hepatoprotective and cardio protective properties. It is used in the treatment of insomnia and CNS disorders. The vasodilator, bronchodilator, spasmolytic and platelet aggregation inhibition activities of the plant have also been reported. Jatamansone, nardostachone and actinidine are the major secondary metabolites present in the plant. This review article is summary of the potential benefits of this medicinal plant as reported in literature. The review also highlights the need for the use of this plant in Ayurvedic system of medicine and future prospects for further research.

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