Mouse embryonic stem cell-derived cardiomyocytes express functional adrenoceptors.

Area of Science:

• Cardiology
• Stem Cell Biology
• Pharmacology

Background:

• Embryonic stem cell (ES) cardiogenesis is well-studied, but adrenoceptor (AR) system development during differentiation remains unclear.
• AR systems are crucial for cardiac physiology and pharmacology.
• Understanding AR development in ES cell-derived cardiomyocytes (ESCMs) is vital.

Purpose of the Study:

• To investigate adrenoceptor subtype expression during ES cell differentiation into cardiomyocytes.
• To examine beta-adrenergic modulation of muscarinic receptors in ESCMs.
• To analyze adrenoceptor-related signaling pathways in ESCMs.

Main Methods:

• Reverse transcription-polymerase chain reaction (RT-PCR) for mRNA expression analysis.
• Vitamin C induction for differentiation.
• Pharmacological manipulation using AR antagonists (CGP20712A, ICI118551) and agonists (Isoprenaline).

Main Results:

• Undifferentiated ES cells expressed alpha(1A)-, alpha(1B)-, alpha(1D)-, and beta(2)-AR mRNA; beta(1)-AR emerged post-differentiation.
• Alpha(1A)-, alpha(1D)-, and beta(1)-AR expression increased significantly during differentiation.
• Both alpha(1)-AR and beta-AR activated extracellular signal-regulated kinase (ERK); Isoprenaline inhibited M(2) muscarinic receptor protein expression.

Conclusions:

• Functional adrenoceptors and tyrosine hydroxylase are differentially expressed during ESCM differentiation.
• Adrenoceptor signaling pathways and beta-adrenergic modulation of muscarinic receptors are established in ESCMs.
• These findings provide insights into the development of adrenergic signaling in the embryonic heart.