Document Detail

Timing of bone marrow cell therapy is more important than repeated injections after myocardial infarction.
MedLine Citation:
PMID:  20667749     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND: Bone marrow cell treatment has been proposed as a therapy for myocardial infarction, but the optimal timing and number of injections remain unknown.
METHODS: Myocardial infarction was induced in mice followed by ultrasound-guided injection of mouse bone marrow cells at different time points post myocardial infarction (Days 3, 7, and 14) as monotherapy and at Days 3+7 as "double" therapy and at Days 3+7+14 as "triple" therapy. Controls received saline injections at Day 3 and Days 3+7+14. Left ventricular ejection fraction was evaluated post myocardial infarction prior to any therapy and at Day 28. Hearts were analyzed at Day 28 for infarct size and survival of donor cells.
RESULTS: Left ventricular ejection fraction decreased from 55.3±0.9% to 37.6±0.6% (P<.001) 2 days post myocardial infarction in all groups. Injection of bone marrow cells at Day 3 post myocardial infarction resulted in smaller infarct size (17.8±3.6% vs. 36.6±7.1%; P=.05) and improved LV function (left ventricular ejection fraction 40.3±2.0% vs. 31.1±8.3%; P<.05) compared to control. However, delayed therapy at Day 7 or 14 did not. Multiple injections of bone marrow cells, either double therapy or triple therapy, did not result in reduction in infarct size, but led to improvements in left ventricular ejection fraction at Day 28 compared to control (39.9±3.6% and 38.8±5.5% vs. 34.8±5.3%; all P<.05). The number of donor cells surviving at Day 28 did not correlate with improvement in left ventricular ejection fraction.
CONCLUSIONS: Injection of bone marrow cells at Day 3 reduced infarct size and improved left ventricular function. Multiple injections of bone marrow cells had no additive effect. Delaying cell therapy post myocardial infarction resulted in no functional benefit at all. These results will help inform future clinical trials.
Yan Zhang; Richard E Sievers; Megha Prasad; Rachel Mirsky; Henry Shih; Maelene L Wong; Franca S Angeli; Jianqin Ye; Junya Takagawa; Juha W Koskenvuo; Matthew L Springer; William Grossman; Andrew J Boyle; Yerem Yeghiazarians
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Publication Detail:
Type:  Journal Article     Date:  2010-07-29
Journal Detail:
Title:  Cardiovascular pathology : the official journal of the Society for Cardiovascular Pathology     Volume:  20     ISSN:  1879-1336     ISO Abbreviation:  Cardiovasc. Pathol.     Publication Date:    2011 Jul-Aug
Date Detail:
Created Date:  2011-07-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9212060     Medline TA:  Cardiovasc Pathol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  204-12     Citation Subset:  IM    
Copyright Information:
Published by Elsevier Inc.
Division of Cardiology, Department of Medicine, University of California, San Francisco, CA 94143-0103, USA.
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