Thyroid hormone and "cardiac metamorphosis": potential therapeutic implications.

Area of Science:

• Cardiology
• Endocrinology
• Molecular Biology

Background:

• Thyroid hormone (TH) exerts classical effects on cardiac contractility and rhythm.
• Emerging research highlights TH's non-classical roles in intracellular signaling, cardiac stress responses, and remodeling.
• Alterations in the TH-thyroid hormone receptor axis are implicated in heart failure pathophysiology.

Purpose of the Study:

• To review the novel physiological and therapeutic roles of thyroid hormone in cardiac function.
• To explore the involvement of TH in heart failure and its potential as a therapeutic target.
• To discuss the implications of TH analogs in clinical practice for cardiovascular diseases.

Main Methods:

• Review of experimental and clinical studies on thyroid hormone and cardiac function.
• Analysis of the TH-thyroid hormone receptor axis in heart failure.
• Examination of TH's effects on ischemic injury, cardiac remodeling, and hemodynamics.

Main Results:

• TH regulates intracellular pathways involved in cardiac stress and remodeling.
• TH acts as a switch for the fetal cardiac phenotype.
• Changes in TH are linked to impaired cardiac function and increased mortality in heart failure patients.
• TH demonstrates potential in limiting ischemic injury, attenuating remodeling, and improving hemodynamics.

Conclusions:

• Thyroid hormone has significant, multifaceted roles in cardiac health and disease.
• The TH-thyroid hormone receptor axis is a promising therapeutic target for heart failure.
• Further large-scale clinical trials are needed to evaluate the efficacy of TH-based therapies for cardiac conditions.