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Updated: Oct 6, 2025

Neonatal Cardiac Scaffolds: Novel Matrices for Regenerative Studies

Neonatal Cardiac Scaffolds: Novel Matrices for Regenerative Studies

Published on: November 5, 2016

Characterizing Neonatal Heart Maturation, Regeneration, and Scar Resolution Using Spatial Transcriptomics.

Adwiteeya Misra^1,2, Cameron D Baker³, Elizabeth M Pritchett³

¹Department of Medicine, Aab Cardiovascular Research Institute, School of Medicine and Dentistry, University of Rochester, Rochester, NY 14642, USA.

Journal of Cardiovascular Development and Disease

|January 20, 2022

Summary

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This summary is machine-generated.

Neonatal mouse hearts regenerate by resolving fibrotic scars and generating new heart cells. Spatial transcriptomics revealed key gene programs and a regenerative border zone crucial for this scar resolution and cardiomyocyte restoration.

Area of Science:

Cardiovascular Biology
Regenerative Medicine
Developmental Biology

Background:

Neonatal mammalian hearts possess significant regenerative capacity, including scar resolution and cardiomyocyte generation.
Understanding the molecular mechanisms underlying neonatal heart repair is crucial for developing therapeutic strategies.

Purpose of the Study:

To investigate the mechanisms facilitating heart repair after apical resection in neonatal mice.
To define the spatial and temporal gene expression programs governing neonatal heart regeneration and scar resolution.

Main Methods:

Bulk and spatial transcriptomic analyses were performed on neonatal mouse hearts at regenerative and non-regenerative timepoints post-apical resection.
Spatial transcriptomics provided high-resolution insights into myocardial domains and scar characteristics.

Keywords:

fibroblast heart mouse regeneration scar spatial transcriptomics

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Main Results:

Spatial transcriptomics revealed distinct atrial and ventricular myocardial domains with dynamic phenotypic changes during postnatal maturation.
The cardiac scar transitions from a proliferative to a secretory phenotype, characterized by inflammation, epicardium expansion, ECM production, metabolic reprogramming, and lipogenic extrusion.
A regenerative border zone emerged, marked by immature cardiomyocyte markers and high Sprr1a expression.

Conclusions:

This study defines the spatially and temporally restricted gene programs essential for neonatal heart regeneration.
Findings provide insights into cardio-restorative mechanisms, highlighting scar resolution and cardiomyocyte restoration processes.