Affiliation:
1. Toronto General Hospital Research Institute University Health Network Toronto Canada
2. Division of Cardiovascular Surgery, Department of Surgery University of Toronto Toronto Canada
Abstract
Background
Heart failure (HF) is a clinical syndrome associated with a progressive decline in myocardial function and low‐grade systemic inflammation. Chronic inflammation can have lasting effects on the bone marrow (BM) stem cell pool by impacting cell renewal and lineage differentiation. However, how HF affects BM stem/progenitor cells remains largely unexplored.
Methods and Results
EGFP
+
(Enchanced green fluorescent protein) mice were subjected to coronary artery ligation, and BM was collected 8 weeks after myocardial infarction. Transplantation of EGFP
+
BM into wild‐type mice revealed reduced reconstitution potential of BM from mice subjected to myocardial infarction versus BM from sham mice. To study the effects HF has on human BM function, 71 patients, HF (n=20) and controls (n=51), who were scheduled for elective cardiac surgery were consented and enrolled in this study. Patients with HF exhibited more circulating blood myeloid cells, and analysis of patient BM revealed significant differences in cell composition and colony formation potential. Human CD34
+
cell reconstitution potential was also assessed using the NOD‐SCID‐IL2rγ
null
mouse xenotransplant model. NOD‐SCID‐IL2rγ
null
mice reconstituted with BM from patients with HF had significantly fewer engrafted human CD34
+
cells as well as reduced lymphoid cell production. Analysis of tissue repair responses using permanent left anteriordescending coronary artery ligation demonstrated reduced survival of HF‐BM reconstituted mice as well as significant differences in human (donor) and mouse (host) cellular responses after MI.
Conclusions
HF alters the BM composition, adversely affects cell reconstitution potential, and alters cellular responses to injury. Further studies are needed to determine whether restoring BM function can impact disease progression or improve cellular responses to injury.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Cardiology and Cardiovascular Medicine
Cited by
3 articles.
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