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Yokota A, Gamoh S, Tanaka-Totoribe N, Shiba T, Kuwabara M, Nakamura E, Hayase T, Hisa H, Nakamura K, Yamamoto R. Angiotensin II, as well as 5-hydroxytriptamine, is a potent vasospasm inducer of saphenous vein graft for coronary artery bypass grafting in patients with diabetes mellitus. Biochem Biophys Rep 2016; 6:82-87. [PMID: 28955866 PMCID: PMC5600313 DOI: 10.1016/j.bbrep.2016.03.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 03/07/2016] [Accepted: 03/16/2016] [Indexed: 01/02/2023] Open
Abstract
Diabetes mellitus (DM) is an important risk factor for adverse outcomes of coronary artery bypass grafting. The bypass grafts harvested from patients with DM tend to go into spasm after their implantation into the coronary circulation. To clarify the contribution of 5-hydroxytriptamine (5-HT) and angiotensin II (AngII) in the bypass graft spasm, we examined the contractile reactivity to 5-HT or AngII of isolated human endothelium-denuded saphenous vein (SV) harvested from DM and non-DM patients. The 5-HT-induced constriction of the SV was significantly augmented in the DM group than in the non-DM group, which is similar to our previous report. AngII-induced constriction of the SV was also significantly augmented in the DM group than the non-DM group. Especially in the non-DM group, the AngII-induced maximal vasoconstriction was markedly lower than the 5-HT-induced one. Meanwhile, the increasing rates of AngII-induced vasoconstriction in the DM group to the non-DM group were significantly greater than those of 5-HT-induced vasoconstriction. These results indicate that 5-HT is a potent inducer of SV graft spasm in both DM and non-DM patients, while AngII is a potent inducer of SV graft spasm only in patients with DM. Furthermore, the protein level of AngII AT1 receptor (AT1R), but not the protein level of 5-HT2A receptor, in the membrane fraction of the SV smooth muscle cells of DM patients was significantly increased as compared with that of the non-DM patients. These results suggest that the mechanism for hyperreactivity to AngII in the SV from DM patients is due to, at least in part, the increase in the amount of AT1R on membrane of the SV smooth muscle cells. The vasoconstrictive reactivity to 5-HT was significantly enhanced in the DM. The vasoconstrictive reactivity to AngII was significantly enhanced in the DM. In DM patients, the hyperreactivity to AngII was significantly higher than that to 5-HT. The protein level AT1 R in membrane fraction of saphenous vein smooth muscle was significantly increased in the DM. AngII could be a potent inducer of SV graft spasm only in DM patients.
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Affiliation(s)
- Atsuko Yokota
- Department of Cardiovascular Surgery, Miyazaki Prefectural Nobeoka Hospital, Nobeoka 882-0835, Japan.,Department of Surgery, Faculty of Medicine, Miyazaki University, Miyazaki 889-1692, Japan
| | - Shuji Gamoh
- First Department of Pharmacology, Graduate School of Clinical Pharmacy, Kyushu University of Health and Welfare, Nobeoka 882-8508, Japan
| | - Naoko Tanaka-Totoribe
- First Department of Pharmacology, Graduate School of Clinical Pharmacy, Kyushu University of Health and Welfare, Nobeoka 882-8508, Japan
| | - Tatsuo Shiba
- First Department of Pharmacology, Graduate School of Clinical Pharmacy, Kyushu University of Health and Welfare, Nobeoka 882-8508, Japan
| | | | - Eisaku Nakamura
- Department of Surgery, Faculty of Medicine, Miyazaki University, Miyazaki 889-1692, Japan
| | - Takahiro Hayase
- Department of Cardiovascular Surgery, Miyazaki Prefectural Nobeoka Hospital, Nobeoka 882-0835, Japan
| | - Hiroaki Hisa
- Second Department of Pharmacology, Graduate School of Clinical Pharmacy, Kyushu University of Health and Welfare, Nobeoka 882-8508, Japan
| | - Kunihide Nakamura
- Department of Surgery, Faculty of Medicine, Miyazaki University, Miyazaki 889-1692, Japan
| | - Ryuichi Yamamoto
- First Department of Pharmacology, Graduate School of Clinical Pharmacy, Kyushu University of Health and Welfare, Nobeoka 882-8508, Japan
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