Pim1 Kinase Overexpression Enhances ckit+ Cardiac Stem Cell Cardiac Repair Following Myocardial Infarction in Swine.
J Am Coll Cardiol
; 68(22): 2454-2464, 2016 Dec 06.
Article
in En
| MEDLINE
| ID: mdl-27908351
ABSTRACT
BACKGROUND:
Pim1 kinase plays an important role in cell division, survival, and commitment of precursor cells towards a myocardial lineage, and overexpression of Pim1 in ckit+ cardiac stem cells (CSCs) enhances their cardioreparative properties.OBJECTIVES:
The authors sought to validate the effect of Pim1-modified CSCs in a translationally relevant large animal preclinical model of myocardial infarction (MI).METHODS:
Human cardiac stem cells (hCSCs, n = 10), hckit+ CSCs overexpressing Pim1 (Pim1+; n = 9), or placebo (n = 10) were delivered by intramyocardial injection to immunosuppressed Yorkshire swine (n = 29) 2 weeks after MI. Cardiac magnetic resonance and pressure volume loops were obtained before and after cell administration.RESULTS:
Whereas both hCSCs reduced MI size compared to placebo, Pim1+ cells produced a â¼3-fold greater decrease in scar mass at 8 weeks post-injection compared to hCSCs (-29.2 ± 2.7% vs. -8.4 ± 0.7%; p < 0.003). Pim1+ hCSCs also produced a 2-fold increase of viable mass compared to hCSCs at 8 weeks (113.7 ± 7.2% vs. 65.6 ± 6.8%; p <0.003), and a greater increase in regional contractility in both infarct and border zones (both p < 0.05). Both CSC types significantly increased ejection fraction at 4 weeks but this was only sustained in the Pim1+ group at 8 weeks compared to placebo. Both hCSC and Pim1+ hCSC treatment reduced afterload (p = 0.02 and p = 0.004, respectively). Mechanoenergetic recoupling was significantly greater in the Pim1+ hCSC group (p = 0.005).CONCLUSIONS:
Pim1 overexpression enhanced the effect of intramyocardial delivery of CSCs to infarcted porcine hearts. These findings provide a rationale for genetic modification of stem cells and consequent translation to clinical trials.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Fungal Proteins
/
Gene Expression Regulation
/
Mitogen-Activated Protein Kinases
/
Myocytes, Cardiac
/
Stem Cell Transplantation
/
Myocardial Infarction
Type of study:
Clinical_trials
/
Prognostic_studies
Limits:
Animals
/
Female
/
Humans
Language:
En
Journal:
J Am Coll Cardiol
Year:
2016
Type:
Article