Endothelial progenitor cells: current issues on characterization and challenging clinical applications
Thomas Resch1, Andreas Pircher, Christian M Kähler
1Center of Operative Medicine, Department of Visceral, Transplant, and Thoracic Surgery, Medical University Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria. t.resch@uki.at
Abstract:
Since their discovery about a decade ago, endothelial precursor cells (EPC) have been subjected to intensive investigation. The vision to stimulate respectively suppress a key player of vasculogenesis opened a plethora of clinical applications. However, as research opened deeper insights into EPC biology, the enthusiasm of the pioneer era has been damped in favour of a more critical view. Recent research is focused on three major questions: The fact that the number of EPC in peripheral blood is exceedingly low has consistently raised suspicion whether these cells can plausibly have an impact on physiological or pathophysiological processes. Secondly, whereas the key role of EPC in tumourigenesis has been strongly emphasized by various groups in the past, recent publications are challenging this hypothesis. Thirdly, the lack of consensus on EPC-defining markers and standardized protocols for their detection have repeatedly led to difficulties concerning comparability between papers. In this current review, an overview on recent findings on EPC biology is given, their challenging clinical implications are discussed and the perplexity underlying the current controversial debate is illustrated.
Insights
Endothelial precursor cells (EPCs) show potential for clinical applications but face scrutiny. Current research questions their impact, role in tumor growth, and detection methods due to low numbers and inconsistent findings.
Area of Science:
- Cell Biology
- Vascular Biology
- Regenerative Medicine
Background:
- Endothelial precursor cells (EPCs) have been extensively studied for their role in vasculogenesis.
- Initial enthusiasm for EPCs' clinical applications has been tempered by recent critical research.
- Key questions surround the biological significance and clinical relevance of EPCs.
Purpose of the Study:
- To provide an overview of recent findings in EPC biology.
- To discuss the challenges and controversies in EPC research.
- To critically evaluate the clinical implications of EPCs.
Main Methods:
- Literature review of recent publications on EPC biology.
- Analysis of studies addressing EPC numbers, function, and detection.
- Discussion of controversial aspects in the current EPC research landscape.
Main Results:
- The exceedingly low number of EPCs in peripheral blood raises doubts about their physiological impact.
- Recent evidence challenges the previously emphasized role of EPCs in tumor growth.
- Lack of consensus on EPC markers and detection protocols hinders inter-study comparability.
Conclusions:
- EPC biology is complex, with ongoing debate regarding their true role and clinical utility.
- Further standardization in detection and a critical re-evaluation of their functions are necessary.
- The clinical applications of EPCs require more rigorous investigation and validation.
