Protocol for endolysosomal proteomics in goat atrial tissue using a refined density-gradient approach.

Area of Science:

• Biochemistry
• Proteomics
• Cardiovascular Research

Background:

• Atrial fibrillation (AF) involves complex cellular mechanisms.
• Understanding endolysosomal (EL) protein function in AF is crucial.
• Existing methods for organelle isolation from cardiac tissue can be challenging.

Purpose of the Study:

• To present a refined protocol for analyzing endolysosomal proteins in goat atrial fibrillation (AF) tissue.
• To enable detailed molecular and proteomic studies of AF pathophysiology.
• To improve the isolation of specific organelles from cardiac tissue.

Main Methods:

• Utilized a modified density-gradient, proteomic-based fractionation technique.
• Employed discontinuous Percoll and sucrose gradients for organelle separation.
• Included steps for tissue isolation, homogenization, peptide analysis, and data analysis.

Main Results:

• Successfully isolated sarcoplasmic reticulum, mitochondria, and endolysosomal (EL) organelles with minimal contamination.
• Achieved distinct organelle separation based on density (mitochondria at 1.3 g/mL, EL at 1.04 g/mL).
• Established a foundation for protein network identification within isolated organelles.

Conclusions:

• The developed protocol provides a robust method for endolysosomal protein analysis in AF.
• This technique supports advanced molecular and proteomic investigations into cardiac disease.
• The protocol facilitates a deeper understanding of AF pathogenesis at the organelle level.