Methods to Measure Intracellular Ca²⁺ Concentration Using Ca²⁺-Sensitive Dyes.

Area of Science:

• Cellular Biology
• Biochemistry
• Physiology

Background:

• Calcium ion (Ca²⁺) acts as a critical second messenger in cellular signaling.
• Understanding intracellular Ca²⁺ concentration ([Ca²⁺]_i) dynamics is vital for interpreting cellular functions.
• Existing methods for measuring [Ca²⁺]_i can be complex or lack robustness.

Purpose of the Study:

• To present a simple, robust, and widely applicable method for measuring intracellular Ca²⁺ concentration ([Ca²⁺]_i) dynamics.
• To provide a detailed protocol for using the Ca²⁺-sensitive dye Fura-2.
• To demonstrate the application of Fura-2 in specific cell types and for monitoring Ca²⁺ influx.

Main Methods:

• Utilizing the Ca²⁺-sensitive chemical dye Fura-2 for fluorescence-based measurement of [Ca²⁺]_i.
• Developing a general protocol for assessing [Ca²⁺]_i in adherent cells.
• Applying the Fura-2 method to human adrenocortical cells and primary skin fibroblasts.
• Describing procedures for monitoring Ca²⁺ influx across the plasma membrane.

Main Results:

• The Fura-2 dye provides a reliable method for quantifying changes in intracellular Ca²⁺.
• The presented protocol is adaptable to various adherent cell systems.
• Specific applications in human adrenocortical cells and fibroblasts demonstrate the method's versatility.
• The technique effectively monitors calcium ion influx.

Conclusions:

• The Fura-2 method offers a practical and effective approach to studying intracellular Ca²⁺ dynamics.
• This technique is valuable for research in cellular biology and signaling.
• The described protocols facilitate the investigation of Ca²⁺-related cellular processes.