Analysis of Cardiac Contractile Dysfunction and Ca2+ Transients in Rodent Myocytes

Area of Science:

• Cardiovascular Biology
• Cellular Physiology
• Cardiac Electrophysiology

Background:

• Cardiac contractile dysfunction and calcium (Ca2+) transients are key indicators of cardiac injury and remodeling.
• Assessing these functional alterations at the cellular level is crucial for comprehensive cardiac assessment.

Purpose of the Study:

• To present a detailed protocol for analyzing unloaded shortening and Ca2+ transients in primary adult cardiac myocytes.
• To provide a method for comparing functional alterations in myocytes from injured hearts versus sham controls or in vitro therapeutic treatments.

Main Methods:

• Isolation of adult cardiac myocytes via collagenase digestion, followed by Ca2+ tolerance induction.
• Adhesion of myocytes to laminin-coated coverslips for electrical pacing in serum-free media.
• Measurement of unloaded shortening using sarcomere length detection and Ca2+ transients with Fura-2 AM.

Main Results:

• The protocol enables detailed analysis of myocyte contractility and Ca2+ handling.
• The methodology is adaptable for myocytes from various species, including rats.
• Data analysis steps for sarcomere shortening and Ca2+ transients are incorporated.

Conclusions:

• This protocol offers a robust method for evaluating cellular cardiac function.
• It is valuable for research into cardiac injury, remodeling, and therapeutic interventions.
• The approach facilitates direct comparison of myocyte functional states.