期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 220, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2021.112212
关键词
Red light; Extracellular vesicles; Exocytosis; Photobiomodulation; Nitric oxide; Endothelium; S-nitrosothiol
资金
- NHLBI [HL139557]
- Veteran Health Administration [I01BX004675, 1IK2BX002426]
Red light promotes ex vivo dilation of blood vessels by secreting a quasi-stable and transferable vasoactive substance with the characteristics of Snitrosothiols from the endothelium. This vasodilator is embedded in extracellular vesicles and the action of red light on vesicular trafficking could be related to the expression of endosome associated membrane protein CD63 and endosome localization in the endothelium.
Red light (670 nm) promotes ex vivo dilation of blood vessels in a nitric oxide (NO) dependent, but eNOS independent manner by secreting a quasi-stable and transferable vasoactive substance with the characteristics of Snitrosothiols (RSNO) from the endothelium. In the present work we establish that 670 nm light mediated vasodilation occurs in vivo and is physiologically stable. Light exposure depletes intracellular S-nitroso protein while concomitantly increasing extracellular RNSO, suggesting vesicular pathways are involved. Furthermore, we demonstrate this RSNO vasodilator is embedded in extracellular vesicles (EV). The action of red light on vesicular trafficking appears to increase expression of endosome associated membrane protein CD63 in bovine aortic endothelial cells, enhance endosome localization in the endothelium, and induce exit of RSNO containing EVs from murine facialis arteries. We suggest a mechanism by which the concerted actions of 670 nm light initiate formation of RSNO containing EVs which exit the endothelium and trigger relaxation of smooth muscle cells.
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