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Ischemia-modified albumin levels in overt and subclinical hypothyroidism

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Abstract

Background

Free radical-mediated oxidative stress (OS) has been implicated in the pathogenesis of thyroid disorders. The ischemia-modified albumin (IMA) has been proposed as a marker of protein oxidative damage, which has been found to reflect hypoxic stress.

Aim

Our aim was to evaluate IMA, malondialdehyde (MDA), and reduced glutathione (GSH) levels in patients with overt hypothyroidism (OHT) and subclinical hypothyroidism (SHT) in comparison to euthyroid controls.

Subjects and methods

Albumin, IMA, IMA/albumin ratio, MDA, GSH, total cholesterol (TC), triglycerides (TG), HDL-Cholesterol were assessed in 105 subjects grouped into OHT, SHT patients, and euthyroid controls with 35 subjects in each group.

Results

MDA and IMA levels were significantly elevated while the GSH concentrations were significantly lower in OHT and SHT patients compared to controls (p < 0.01). When IMA values were normalized for albumin concentrations, the IMA/albumin ratio was also significantly elevated in both patient groups compared to controls (p < 0.01). These changes were more pronounced in the OHT group when compared to SHT group. In OHT group, thyroid-stimulating hormone (TSH) levels showed significant positive correlation with MDA (r = 0.470, p = 0.004), IMA (r = 0.530, p = 0.001), and IMA/albumin ratio (r = 0.525, p = 0.001). Both IMA (r = −0.342, p = 0.041), IMA/albumin ratio (r = −0.378, p = 0.023) showed significant negative correlation with GSH in OHT patients. No significant correlation between variables was, however, observed in SHT group.

Conclusions

Increase of MDA and IMA levels with decreased antioxidant status indicate the presence of OS in hypothyroid patients, which was more pronounced in OHT patients. Elevated levels of IMA can be a clinically useful marker of protein oxidative damage and OS in hypothyroidism.

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Abbreviations

OS:

Oxidative stress

OHT:

Overt hypothyroidism

SHT:

Subclinical hypothyroidism

MDA:

Malondialdehyde

PCO:

Protein carbonyls

IMA:

Ischemia-modified albumin

HSA:

Human serum albumin

ROS:

Reactive oxygen species

GSH:

Reduced glutathione

TSH:

Thyroid-stimulating hormone

T3:

Triiodothyronine

T4:

Thyroxine

TC:

Total cholesterol

DTT:

Dithiothreitol

ABSU:

Absorbance units

DTNB:

Dithiobis-nitro benzoic acid

SD:

Standard deviation

ANOVA:

Analysis of variance

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Conflict of interest

Authors declare that they have no conflict of interest.

Ethical approval

The present study was approved by the Institutional ethical committee.

Informed consent

The study was carried out on human participants after obtaining informed consent from the participants.

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Authors and Affiliations

  1. Sri Venkateswara Institute of Medical Sciences, Tirupati, Andhra Pradesh, India

    S. V. Reddy, M. M. Suchitra, V. Pradeep, S. Alok, V. Suresh, A. R. Bitla & P. V. L. N. Srinivasa Rao

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  1. S. V. Reddy
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  2. M. M. Suchitra
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  3. V. Pradeep
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  4. S. Alok
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  5. V. Suresh
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  6. A. R. Bitla
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  7. P. V. L. N. Srinivasa Rao
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Correspondence to M. M. Suchitra.

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Reddy, S.V., Suchitra, M.M., Pradeep, V. et al. Ischemia-modified albumin levels in overt and subclinical hypothyroidism. J Endocrinol Invest 38, 885–890 (2015). https://doi.org/10.1007/s40618-015-0283-x

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  • DOI: https://doi.org/10.1007/s40618-015-0283-x

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