Promising therapy for cardiac regeneration

Date:
June 30, 2020
Source:
University of Helsinki
Summary:
New research gives information in order to understand safety,
efficacy and mechanisms of action of a new cardiac therapy.



FULL STORY ========================================================================== Ischemic heart disease (IHD) has maintained its rank as one of the
worldwide leading causes of mortality outweighing the burden from all malignancies combined.


==========================================================================
When IHD develops, chronic myocardial ischemia, aggravated in some
instances by periods of acute ischemia in the form of myocardial
infarction, ensue. Damaged myocardium is replaced with a fibrotic scar
that over-activates physiologic compensatory mechanisms with challenging sequalae, such as myocardial rigidity and eventually, over time,
heart failure.

A research collaboration team at University of Helsinki together with a
State Key Laboratory of Cardiovascular Disease (FuWai Hospital, Beijing,
China) has investigated in a mouse model of artificial myocardial
infarction, the molecular mechanisms underlying novel, easily clinically implementable tissue- engineered approach for stimulating the myocardial regeneration.

The tissue-engineered approach relies on a local transplantation of
minute pieces of autologous atrial appendage tissue, termed atrial
appendage micrografts (AAMs), to the surface of the ischaemically
stressed myocardium.

Results of the investigation are published in the Journal of Heart and
Lung Transplantation.

"We were able to get a comprehensive view on how the heart's functional, structural and metabolic aspects of healing are influenced by AAMs patch transplantation following acute ischemia," says Docent Esko Kankuri from University of Helsinki.

Heart's pumping function preserved, also improved functional recovery
The research group ulitized complementary tools, including systematic postoperative functional echocardiographic follow-up, histomorphometric analyses and finally site-selective proteomics in tandem with functional bioinformatics.

"We demonstrated not only preservation of heart's pumping function
following critical ischemic insult but also improved functional recovery following AAMs transplantation during follow-up," says Docent Maciej
Lalowski from University of Helsinki.

"We identified 1 005 proteins from the myocardium, of which 216
were differentially expressed immediately below the AAMs patch in 'subtransplant' area and 43 in the interventricular septum remote to
the AAMs transplantation site," Lalowski continues.

The therapy is currently undergoing clinical safety and feasibility
evaluation as an adjuvant to the coronary artery bypass grafting
operation.


========================================================================== Story Source: Materials provided by University_of_Helsinki. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Xie Yanbo, Milla Lampinen, Juuso Takala, Vilbert Sikorski, Rabah
Soliymani, Miikka Tarkia, Maciej Lalowski, Eero Mervaala,
Markku Kupari, Zhe Zheng, Shengshou Hu, Ari Harjula, Esko
Kankuri. Epicardial transplantation of atrial appendage micrograft
patch salvages myocardium after infarction. The Journal of Heart
and Lung Transplantation, 2020; DOI: 10.1016/j.healun.2020.03.023 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/06/200630103605.htm

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