nAChRs Mediate Human Embryonic Stem Cell-Derived Endothelial Cells: Proliferation, Apoptosis, and AngiogenesisReport as inadecuate




nAChRs Mediate Human Embryonic Stem Cell-Derived Endothelial Cells: Proliferation, Apoptosis, and Angiogenesis - Download this document for free, or read online. Document in PDF available to download.

Background

Many patients with ischemic heart disease have cardiovascular risk factors such as cigarette smoking. We tested the effect of nicotine a key component of cigarette smoking on the therapeutic effects of human embryonic stem cell-derived endothelial cells hESC-ECs.

Methods and Results

To induce endothelial cell differentiation, undifferentiated hESCs H9 line underwent 4-day floating EB formation and 8-day outgrowth differentiation in EGM-2 media. After 12 days, CD31+ cells 13.7±2.5% were sorted by FACScan and maintained in EGM-2 media for further differentiation. After isolation, these hESC-ECs expressed endothelial specific markers such as vWF 96.3±1.4%, CD31 97.2±2.5%, and VE-cadherin 93.7±2.8%, form vascular-like channels, and incorporated DiI-labeled acetylated low-density lipoprotein DiI-Ac-LDL. Afterward, 5×106 hESC-ECs treated for 24 hours with nicotine 10−8 M or PBS as control were injected into the hearts of mice undergoing LAD ligation followed by administration for two weeks of vehicle or nicotine 100 µg-ml in the drinking water. Surprisingly, bioluminescence imaging BLI showed significant improvement in the survival of transplanted hESC-ECs in the nicotine treated group at 6 weeks. Postmortem analysis confirmed increased presence of small capillaries in the infarcted zones. Finally, in vitro mechanistic analysis suggests activation of the MAPK and Akt pathways following activation of nicotinic acetylcholine receptors nAChRs.

Conclusions

This study shows for the first time that short-term systemic administrations of low dose nicotine can improve the survival of transplanted hESC-ECs, and enhance their angiogenic effects in vivo. Furthermore, activation of nAChRs has anti-apoptotic, angiogenic, and proliferative effects through MAPK and Akt signaling pathways.



Author: Jin Yu , Ngan F. Huang , Kitchener D. Wilson , Jeffrey B. Velotta, Mei Huang, Zongjin Li, Andrew Lee, Robert C. Robbins, John P.

Source: http://plos.srce.hr/



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