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자료유형
학술저널
저자정보
Suparna Roy (Calcutta National Medical College) Anindya Dasgupta (Calcutta National Medical College)
저널정보
대한내분비학회 Endocrinology and Metabolism Endocrinology and Metabolism Vol.32 No.1
발행연도
2017.1
수록면
129 - 139 (11page)

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Background: Metabolic dysfunctions characteristic of overt hypothyroidism (OH) start at the early stage of subclinical hypothyroidism(SCH). Na+/K+-ATPase (the sodium pump) is a transmembrane enzyme that plays a vital role in cellular activities in combinationwith membrane lipids. We evaluated the effects of early changes in thyroid hormone and membrane cholesterol on sodiumpump activity in SCH and OH patients. Methods: In 32 SCH patients, 35 OH patients, and 34 euthyroid patients, sodium pump activity and cholesterol levels in red bloodcell membranes were measured. Serum thyroxine (T4) and thyroid stimulating hormone (TSH) levels were measured using enzymelinkedimmunosorbent assays. Differences in their mean values were analysed using post hoc analysis of variance. We assessed thedependence of the sodium pump on other metabolites by multiple regression analysis. Results: Sodium pump activity and membrane cholesterol were lower in both hypothyroid groups than in control group, OH groupexhibiting lower values than SCH group. In SCH group, sodium pump activity showed a significant direct dependence on membranecholesterol with an inverse relationship with serum TSH levels. In OH group, sodium pump activity depended directly on membranecholesterol and serum T4 levels. No dependence on serum cholesterol was observed in either case. Conclusion: Despite the presence of elevated serum cholesterol in hypothyroidism, membrane cholesterol contributed significantlyto maintain sodium pump activity in the cells. A critical reduction in membrane cholesterol levels heralds compromised enzyme activity,even in the early stage of hypothyroidism, and this can be predicted by elevated TSH levels alone, without any evident clinicalmanifestations.

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