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30 November 2016 : Clinical Research  

Serum Lipid Transfer Proteins in Hypothyreotic Patients Are Inversely Correlated with Thyroid-Stimulating Hormone (TSH) Levels

Anna Skoczyńska1ACDEF*, Anna Wojakowska2BCF, Barbara Turczyn2BCF, Katarzyna Zatońska3B, Maria Wołyniec3B, Natalia Rogala4B, Andrzej Szuba5A, Grażyna Bednarek-Tupikowska4AD

DOI: 10.12659/MSM.898134

Med Sci Monit 2016; 22:4661-4669

Abstract

BACKGROUND: Plasma cholesteryl ester transfer protein (CETP) activity is often decreased in patients with hypothyroidism, whereas less is known about the phospholipid transfer protein (PLTP). We aimed to evaluate simultaneously serum CETP and PLTP activity in patients diagnosed with hypothyroidism.

MATERIAL AND METHODS: The selection criteria for control group members (without thyroid dysfunction) in this case to case study were levels of total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol (HDL-C), and triglycerides similar to those in study group patients (101 patients diagnosed with hypothyroidism). Serum CETP and PLTP activities were measured by homogenous fluorometric assays using synthetic donor particle substrates.

RESULTS: Serum CETP and PLTP activities in hypothyreotic patients were lower (p<0.001) compared with those in healthy subjects. This lowering was associated with significant changes in HDL-C subclasses: decrease in HDL2- and increase in HDL3 cholesterol levels. Multiple linear regression analyses adjusted for age, sex, body mass index, smoking habits, and alcohol drinking showed a strong association between hypothyroidism and activity of lipid transfer proteins. A linear inverse relationship between thyroid-stimulating hormone (TSH) and CETP (r=–0.21; p<0.01) and between TSH and PLTP (r=–0.24; p<0.001) was shown. There also was a positive correlation (p<0.001) between CETP and HDL2 cholesterol (r=0.27) and between PLTP and HDL2 cholesterol (r=0.37). A negative correlation between CETP and HDL3 cholesterol (r=–0.22: p<0.01) and between PLTP and HDL3 cholesterol (r=–0.24; p<0.001) has been demonstrated as well.

CONCLUSIONS: The decreased HDL2 and increased HDL3 cholesterol levels in subjects with hypothyroidism are consequences of decreased activity of lipid transfer proteins. These changes are early symptoms of lipid disturbances in hypothyroidism.

Keywords: Case-Control Studies, Alcoholism - blood, Cholesterol Ester Transfer Proteins - blood, Hypothyroidism - blood, Phospholipid Transfer Proteins - blood, Smoking - blood, Thyrotropin - blood

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750