Effect of thyroid hormones on the cardiomyocyte via genomic and nongenomic actions from Reference (2). Reproduced with permission from Jabbar et al. (2). Copyright © 2017, Springer Nature Publishing AG. DIO2, type 2 iodothyronine deiodinase; DIO3, type 3 iodothyronine deiodinase; MAPK, mitogen-activated protein kinase; MYH6, myosin heavy chainα; MYH7, myosin heavy chainβ; PI3K, phosphoinositide 3 kinase; PLN, phospholamban; rT3, reverse T3; SERCA, sarco/endoplasmic reticulum Ca2+-ATPase; T2, diiodothyronine; T3, triiodothyronine; T4, thyroxine; TR, thyroid receptor; TRE, thyroid hormone response element.