Abstract
The long-term patency rate of saphenous vein (SV) grafts is poor compared to arterial grafts. To investigate the effects of surgical preparation (distention) of SV on hydrogen sulfide (H2S) released from the endothelium, human SV segments were harvested from 43 patients during coronary artery bypass surgery (CABG). Acetylcholine (ACh) induced relaxation that was inhibited by NG-nitro-L-arginine + indomethacin and cysteine aminotransferase inhibitor aminooxyacetic acid in the normal SV. In contrast, ACh did not evoke relaxation in the distended SV (DSV). The concentration of H2S quantified by methylene blue assay in DSV was significantly lower than that in control. Transmission electron microscope and immunohistochemistry studies showed that the preparation destroyed the endothelium, smooth muscle, organelle, and vasa vasorum. We conclude that surgical preparation injures the endothelium and smooth muscle of the SV grafts and reduces H2S release from SV. These effects may contribute to the poor long-term patency of the SV graft.
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Abbreviations
- SV:
-
Saphenous vein
- DSV:
-
Distended saphenous vein
- IMA:
-
Internal mammary artery
- H2S:
-
Hydrogen sulfide
- NO:
-
Nitric oxide
- EDHF:
-
Endothelium-derived hyperpolarizing factor
- CABG:
-
Coronary artery bypass surgery
- CAT:
-
Cysteine aminotransferase
- mCAT:
-
Mitochondrial CAT
- cCAT:
-
Cytosolic CAT
- 3-MPST:
-
Mercaptopyruvate sulfurtransferase
- ACh:
-
Acetylcholine
- AOAA:
-
Aminooxyacetic acid
- L-NNA:
-
NG-nitro-L-arginine
- PGI2 :
-
Prostacyclin
- PLP:
-
Pyridoxal 5’-phosphate
- SEM:
-
Standard error of the mean
- TEM:
-
Transmission electron microscope
- EC:
-
Endothelial cell
- SMC:
-
Smooth muscle cell
- VV:
-
Vasa vasorum
- MIT & RER:
-
Mitochondria and rough endoplasmic reticulum
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Funding
This work was supported by the National Natural Science Foundation of China [81870288], the Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences [2019XK310001 and 2018TX31002], and Tianjin Science and Technology Committee [18PTZWHZ00060]
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The clinical relevance:
• The long-term patency rate of saphenous vein (SV) grafts is poor compared to arterial grafts in CABG. We demonstrated that the surgical preparation (distention) of the SV for grafting reduces the amount of hydrogen sulfide (H2S) released from the endothelium due to damage of the endothelium.
• The endothelial damage by the distention procedure of SV during CABG may have an adverse effect on the long-term patency of the SV graft.
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Yuan, C., Hou, HT., Chen, HX. et al. Surgical Preparation Reduces Hydrogen Sulfide Released from Human Saphenous Veins in Coronary Artery Bypass Grafting. J. of Cardiovasc. Trans. Res. 13, 181–190 (2020). https://doi.org/10.1007/s12265-019-09925-x
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DOI: https://doi.org/10.1007/s12265-019-09925-x