# Comparative cardiomyocyte differentiation potential of rat adipose-derived mesenchymal stem cells from two anatomical sites: metabolomic profiling and pathway analysis

## TL;DR

This study compares how fat-derived stem cells from two rat body regions differ in their ability to become heart cells, using metabolic profiling to reveal key differences in energy use.

## Contribution

The study reveals distinct metabolic adaptations in adipose-derived stem cells from different anatomical sites during cardiomyocyte differentiation.

## Key findings

- Peri-ovarian AD-MSCs showed broader metabolic reprogramming with enhanced glycolysis and TCA cycle activity.
- Peri-renal AD-MSCs relied more on galactose metabolism during differentiation.
- Metabolic flexibility in peri-ovarian AD-MSCs suggests greater differentiation potential for cardiac regeneration.

## Abstract

Adipose-derived mesenchymal stem cells (AD-MSCs) have emerged as a promising source for cardiac regenerative therapy due to their multipotency and ease of isolation. However, the impact of anatomical origin on their cardiomyocyte differentiation potential remains unclear. Metabolic analysis provides valuable real-time insights into the cellular metabolic state, capturing dynamic changes in metabolite concentrations that reflect both internal cellular mechanisms and external stimuli. This approach allows us to identify specific metabolic pathways activated during cardiomyocyte differentiation, offering a deeper understanding of how the anatomical origin of stem cells influences their differentiation potential and metabolic flexibility. Such insights are critical for optimizing stem cell-based therapies for cardiac regeneration. This study aimed to compare the differentiation capacity of AD-MSCs derived from peri-ovarian and peri-renal adipose tissue, with a focus on metabolic adaptations during cardiomyocyte differentiation.

AD-MSCs were isolated from peri-ovarian and peri-renal fat of Sprague-Dawley rats and characterized by morphology, immunophenotyping, and multilineage differentiation potential. Cardiomyocyte differentiation was induced using 5-azacytidine, and morphological changes were assessed via phase-contrast microscopy and immunofluorescence staining for cardiac troponin T (cTnT). Untargeted metabolomic profiling was performed using gas chromatography-mass spectrometry (GC-MS), followed by principal component analysis (PCA), partial least squares discriminant analysis (PLS-DA), and pathway enrichment analysis.

Both peri-ovarian and peri-renal AD-MSCs exhibited similar fibroblast-like morphology, MSC-specific marker expression (CD44, CD90, CD29), and multilineage differentiation potential. Following cardiomyocyte induction, both groups displayed morphological changes indicative of differentiation and strong cTnT expression. Metabolomic analysis of the cardiogenic differentiation samples identified distinct metabolic adaptations between the two AD-MSC sources. Peri-ovarian AD-MSCs exhibited a broader metabolic reprogramming, with increased engagement of glycolysis, fructose metabolism, glycerolipid metabolism, and the TCA cycle, suggesting enhanced metabolic flexibility and energy efficiency. In contrast, peri-renal AD-MSCs relied more on galactose metabolism, indicating an alternative energy strategy during differentiation.

The anatomical origin of AD-MSCs influences their metabolic landscape during cardiomyocyte differentiation. Peri-ovarian AD-MSCs demonstrated greater metabolic adaptability, potentially favoring their differentiation capacity, making them a promising candidate for cardiac regenerative applications.