Nanoscale organization of cardiac calcium channels is dependent on thyroid hormone status.

Thyroid hormone dysfunction is frequently observed in patients with chronic illnesses including heart failure, which increases the risk of adverse events. This study examined the effects of thyroid hormones (THs) on cardiac transverse-tubule (TT) integrity, Ca sparks, and nanoscale organization of ion channels in excitation-contraction (EC) coupling, including L-type calcium channel (Ca1.2), ryanodine receptor type 2 (RyR2), and junctophilin-2 (Jph2).