Increase in circulating bone marrow progenitor cells after myocardial infarction

Area of Science:

• Cardiovascular Research
• Stem Cell Biology
• Regenerative Medicine

Background:

• Bone marrow progenitor cells expressing CD34 are crucial for repairing heart tissue after myocardial infarction.
• Mobilization of these progenitor cells into peripheral blood may aid cardiac repair.
• Investigating CD34+ cell levels post-myocardial infarction can confirm myocardial-initiated mobilization.

Purpose of the Study:

• To investigate the concentration of circulating CD34+ cells after ST-elevation myocardial infarction.
• To explore the role of specific cytokines in bone marrow progenitor cell mobilization following myocardial infarction.

Main Methods:

• Serial measurements of CD34+ cells and cytokines (HGF, SDF-1, IL-17, MCP-1, TPO) in 42 myocardial infarction patients and 15 controls.
• Blood samples collected on days 1, 4, 8, and 12 post-myocardial infarction.
• Echocardiography used to estimate infarction size.

Main Results:

• CD34+ cell concentrations significantly increased by day 8 and were sustained through day 12 post-myocardial infarction.
• Hepatocyte growth factor (HGF) showed a significant early rise, followed by a decline.
• No significant changes were observed in SDF-1, IL-17, MCP-1, or TPO levels; CD34+ cell and HGF elevations were independent of infarction size.

Conclusions:

• Elevated circulating CD34+ cells post-myocardial infarction suggest human myocardial-initiated bone marrow progenitor cell mobilization.
• The studied cytokines do not appear to directly mediate bone marrow progenitor cell mobilization in this context.