Changes in thyroid hormone receptors after permanent cerebral ischemia in male rats

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Abstract

Thyroid hormones (TH) and receptors (TRs) may play an important role in the pathophysiology of acute cerebral ischemia. In the present study, we sought to determine whether serum triodothyronine (T3)/thyroxine (T4) and brain TRs (TRα1, TRβ1) might change after experimental stroke. Male adult Wistar rats were subjected to permanent middle cerebral artery occlusion (group P) and compared to sham-operated controls (group S). Animals were followed clinically for 14 days until brain collection for Western blot (WB) or neuropathological analysis of TRs in three different brain areas (infarcted tissue, E1; noninfarcted ipsilateral hemisphere, E2; and contralateral hemisphere, E3). Analysis of serum TH levels showed a reduction of T4 in group P (p∈=∈0.002) at days 2 to 14, while half of the animals also displayed "low T3" values (p∈=∈0.012) on day 14. This T4 reduction was inversely correlated to the clinical severity of stroke and the concomitant body weight loss (p∈

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Lourbopoulos, A., Mourouzis, I., Karapanayiotides, T., Nousiopoulou, E., Chatzigeorgiou, S., Mavridis, T., … Grigoriadis, N. (2014). Changes in thyroid hormone receptors after permanent cerebral ischemia in male rats. Journal of Molecular Neuroscience, 54(1), 78–91. https://doi.org/10.1007/s12031-014-0253-3

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