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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Thyroid hormone analog, diiodothyropropionic acid (DITPA), exerts beneficial effects on chamber and cellular remodeling in cardiomyopathic hamsters.
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Thyroid hormone analog, diiodothyropropionic acid (DITPA), exerts beneficial effects on chamber and cellular remodeling in cardiomyopathic hamsters.

机译:甲状腺激素类似物二碘甲甲状腺酸(DITPA)对心肌病仓鼠的房室和细胞重构具有有益作用。

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摘要

Diiodothyropropionic acid (DITPA) is a thyroid hormone analog that is currently in phase II clinical trials. However, there have not been any studies to comprehensively analyze its effect on myocyte morphology. In addition, long-term studies with DITPA have not been done. This study compares the effects of DITPA with L-thyroxine (T4) on chamber remodeling, cardiac function, cellular morphology, cardiac blood flow, and protein expression. Normal and cardiomyopathic hamsters were treated with T4 or DITPA for 2 months. At the end of the treatment, echos, hemodynamics, coronary blood flow, cell morphology, and protein expression data were collected. Both T4 and DITPA treatment reduced chamber diameter during diastole, suggesting attenuated chamber dilatation in cardiomyopathic hamsters. Wall thickness also tended to increase, which was supported by cell morphology data in which DITPA significantly increased cross-sectional growth of myocytes specifically in the minor dimension, which is oriented transmurally. T4 and DITPA also increased myocardial blood flow both at baseline and after maximal dilation. This suggests there was increased angiogenesis or reduced loss of arterioles. Both T4 and DITPA had beneficial effects on chamber remodeling, which was most likely due to beneficial changes in cell shape and improved vascular supply.
机译:二碘甲状腺丙酸(DITPA)是一种甲状腺激素类似物,目前正在进行II期临床试验。然而,还没有任何研究来全面分析其对肌细胞形态的影响。此外,DITPA的长期研究尚未完成。这项研究比较了DITPA与L-甲状腺素(T4)对房室重塑,心脏功能,细胞形态,心脏血流和蛋白质表达的影响。正常和心肌病仓鼠用T4或DITPA治疗2个月。在治疗结束时,收集回声,血液动力学,冠状动脉血流量,细胞形态和蛋白质表达数据。 T4和DITPA治疗均能降低舒张期室直径,提示心肌病仓鼠的室扩张减弱。壁厚也趋于增加,这得到了细胞形态学数据的支持,其中DITPA显着增加了肌细胞的横断面生长,特别是在较小的尺寸上,这是跨壁取向的。 T4和DITPA还在基线期和最大扩张期后均增加了心肌血流量。这表明血管生成增加或小动脉损失减少。 T4和DITPA都对腔室重塑具有有益作用,这很可能是由于细胞形状的有益变化和血管供应的改善。

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