Epicardial transplantation of atrial appendage micrograft patch salvages myocardium after infarction

Yanbo Xie, Milla Lampinen, Juuso Takala, Vilbert Sikorski, Rabah Soliymani, Miikka Tarkia, Maciej Lalowski, Eero Mervaala, Markku Kupari, Zhe Zheng, Shengshou Hu, Ari Harjula, Esko Kankuri

Research output: Contribution to journalArticleScientificpeer-review


Ischemic heart disease remains the leading cause of mortality and morbidity worldwide despite improved possibilities in medical care. Alongside interventional therapies, such as coronary artery bypass grafting, adjuvant tissue-engineered and cell-based treatments can provide regenerative improvement. Unfortunately, most of these advanced approaches require multiple lengthy and costly preparation stages without delivering significant clinical benefits.
We evaluated the effect of epicardially delivered minute pieces of atrial appendage tissue material, defined as atrial appendage micrografts (AAMs), in mouse myocardial infarction model. An extracellular matrix patch was used to cover and fix the AAMs onto the surface of the infarcted heart.
The matrix-covered AAMs salvaged the heart from infarction-induced loss of functional myocardium and attenuated scarring. Site-selective proteomics of injured ischemic and uninjured distal myocardium from AAMs-treated and untreated tissue sections revealed an increased expression of several cardiac regeneration-associated proteins (i.e. periostin, transglutaminases and glutathione peroxidases) as well as activation of pathways responsible for angio- and cardiogenesis in relation to AAMs therapy.
Epicardial delivery of AAMs encased in an extracellular matrix patch scaffold salvages functional cardiac tissue from ischemic injury and restricts fibrosis after myocardial infarction. Our results support the use of AAMs as tissue-based therapy adjuvants for salvaging the ischemic myocardium.
Original languageEnglish
JournalJournal of Heart and Lung Transplantation
Issue number7
Pages (from-to)707-718
Number of pages12
Publication statusPublished - Jul 2020
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 3126 Surgery, anesthesiology, intensive care, radiology
  • cell therapy
  • myocardial infarction
  • heart failure
  • myocardial regeneration
  • atrial appendage
  • site-selective proteomics

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