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Dey SK, Saini M, Prabhakar P, Kundu S. Dopamine β hydroxylase as a potential drug target to combat hypertension. Expert Opin Investig Drugs 2020; 29:1043-1057. [DOI: 10.1080/13543784.2020.1795830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Sanjay Kumar Dey
- Department of Biochemistry, University of Delhi South Camp us , New Delhi, India
| | - Manisha Saini
- Department of Biochemistry, University of Delhi South Camp us , New Delhi, India
| | - Pankaj Prabhakar
- Department of Biochemistry, University of Delhi South Camp us , New Delhi, India
| | - Suman Kundu
- Department of Biochemistry, University of Delhi South Camp us , New Delhi, India
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Altered coronary microvascular serotonin receptor expression after coronary artery bypass grafting with cardiopulmonary bypass. J Thorac Cardiovasc Surg 2009; 139:1033-40. [PMID: 19660281 DOI: 10.1016/j.jtcvs.2009.05.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2009] [Revised: 05/16/2009] [Accepted: 05/31/2009] [Indexed: 12/12/2022]
Abstract
OBJECTIVE We evaluated roles of serotonin 1B and 2A receptors, thromboxane synthase and receptor, and phospholipases A(2) and C in response to cardiopulmonary bypass. METHODS Patients' atrial tissues were harvested before and after cardiopulmonary bypass with cardioplegia (n = 13). Coronary microvessels were assessed for vasoactive response to serotonin with and without inhibitors of serotonin 1B and 2A receptors and phospholipases A(2) and C. Expressions of serotonin receptor messenger RNA were determined with reverse transcriptase polymerase chain reaction. Expressions of serotonin receptors and thromboxane A(2) receptor and synthase proteins were determined with immunoblotting and immunohistochemistry. RESULTS Microvessel exposure to serotonin elicited 7.3% +/- 2% relaxation before bypass, changing to contraction of -19.2% +/- 2% after bypass (P <.001). Additions of specific serotonin 1B receptor antagonist and inhibitor of phospholipase A(2) resulted in significantly decreased contraction, -8.6% +/- 1% (P < .001) and 2.8% +/- 3% (P = .001), respectively. Serotonin 1B receptor messenger RNA expression increased 1.82 +/- 0.34-fold after bypass (p = .044); serotonin 2A receptor messenger RNA expression did not change. Serotonin 1B but not 2A receptor protein expression increased after bypass by 1.35 +/- 0.7-fold (P = .0413). Thromboxane synthase and receptor expressions were unchanged after bypass. Serotonin 1B receptor increased mainly in arterial smooth muscle. There were no appreciable differences in arterial expressions of thromboxane synthase or receptor. CONCLUSIONS Serotonin-induced vascular dysfunction after cardiopulmonary bypass with cardioplegic arrest may be mediated by increased expression of serotonin 1B receptor and subsequent phospholipase A(2) activation in myocardial coronary smooth muscle.
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Xia ML, Zhou XM, Yao H, Jiang HD, Bruce IC, Wei EQ, Xia Q. Rutin-induced endothelium-dependent vasorelaxation in rat aortic Rings and the underlying mechanism. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2005:5595-7. [PMID: 17281524 DOI: 10.1109/iembs.2005.1615754] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The aim of the present study was to determine the possible mechanism by which rutin causes vasodilatation in isolated thoracic aorta rings from the rat. The effects of rutin on rings preconstricted with phenylephrine, with or without endothelium, were determined using an organ bath technique. The mechanism was explored by measuring the effects of the nitric oxide synthase inhibitor L-N(G)-nitroarginine methyl ester (L-NAME), the guanylyl cyclase inhibitor methylene blue, the cyclooxygenase inhibitor indomethacin, the ATP-sensitive K<sup>+</sup>channel blocker glibenclamide and the beta-adrenoceptor antagonist propranolol. Rutin at the range of 10-160 mumol/L caused dose-dependent vasorelaxation in preconstricted endothelium-intact rings, but had no effect on rings without endothelium. The maximal response calculated from the vasorelaxation curves of rutin was 44.28 plus or mines 7.48%. Pretreatment with L-NAME (0.1 mmol/L), methylene blue (10 mumol/L), glibenclamide (10 mmol/L) or indomethacin (10 mmol/L) attenuated the vasorelaxation induced by rutin in endothelium-intact rings. Glibenclamide (10 mmol/L) enhanced the vasorelaxation of rutin. Propranolol (10 mumol/L) did not block the effect of rutin. The results indicate that vasorelaxation is induced by rutin via the nitric oxide-guanylyl cyclase pathway and a prostaglandin-mediated mechanism, as well as activation of the ATP-sensitive potassium channel.
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Affiliation(s)
- Man-Li Xia
- Zhejiang University School of Medicine, Hangzhou, China; Department of Physiology, Jiaxing College School of Medicine, Jiaxing, China
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Arain SR, Williams DJ, Robinson BJ, Uhrich TD, Ebert TJ. Vascular responsiveness to brachial artery infusions of phenylephrine during isoflurane and desflurane anesthesia. Anesth Analg 2002; 94:1137-40, table of contents. [PMID: 11973175 DOI: 10.1097/00000539-200205000-00014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
UNLABELLED Compared with equi-minimum alveolar anesthetic concentration (MAC) isoflurane, desflurane is associated with greater levels of sympathetic nerve activity in humans but similar reductions in blood pressure. To explore these divergent effects, we evaluated vascular alpha(1)-adrenoceptor responses in the human forearm during isoflurane and desflurane anesthesia to determine if alpha(1)-adrenoceptor responses were more substantially attenuated during desflurane administration. Bilateral forearm venous occlusion plethysmography was used to examine arterial blood flow and to determine changes in forearm vascular resistance during brachial artery infusions of saline and phenylephrine (0.2, 0.4, 0.8, and 1.6 microg/min) in 22 conscious subjects and during anesthesia with 0.65 and 1.3 MAC isoflurane or desflurane. Infusion of phenylephrine into the brachial artery increased the forearm vascular resistance in a dose-dependent manner. The arterial response to phenylephrine was significantly attenuated by 0.65 and 1.3 MAC desflurane and similarly attenuated during 1.3 MAC isoflurane (P < 0.05). Impaired arterial alpha(1)-adrenoceptor responsiveness occurred during desflurane. However, this effect was statistically similar (P > 0.05) to the impaired responses during isoflurane. Blood pressure decreases during volatile anesthesia may be, in part, caused by decreased alpha(1)-adrenoceptor responsiveness. IMPLICATIONS alpha-receptors on blood vessels regulate constriction and dilation and therefore modulate blood pressure. This research indicates that vasoconstriction via the alpha(1)-receptor vascular response is impaired during isoflurane and desflurane anesthesia.
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Affiliation(s)
- Shahbaz R Arain
- Department of Anesthesiology, The Medical College of Wisconsin and Veterans Affairs Medical Center, Milwaukee, 53295, USA
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Volatile anaesthetics restore bradykinin and serotonin-induced coronary vasodilation after blocking nitric oxide synthase: lack of anaesthetic effects on KATP channels and prostaglandin pathways. Eur J Anaesthesiol 2001. [DOI: 10.1097/00003643-200104000-00003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Griffin MJ, Breen PM, O'Connor JJ, Hannon V. Desflurane, compared to halothane, augments phenylephrine-induced contraction in isolated rat aorta smooth muscle. Can J Anaesth 2001; 48:361-8. [PMID: 11339778 DOI: 10.1007/bf03014964] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
PURPOSE The mechanism responsible for the mediation of hypertension in response to increased desflurane levels is unclear. This study compared the effect of desflurane and halothane on phenylephrine (PE)-induced contraction in rat aorta ring and the effect of desflurane in the presence and absence of nitric oxide (NO) synthase activity. METHODS Endothelium-free rat aorta rings were exposed serially to 10(-7) M, 10(-6) M and 10(-5) M PE alone and subsequently in the presence of 2 MAC desflurane and halothane. Secondly, endothelium-free preparations were exposed to 10(-6) M PE serially in the presence of 0, 1, 2 and 3 MAC desflurane and halothane. Thirdly, using an endothelium-intact preparation, the effect of desflurane on PE-induced contraction was examined, in the presence or absence of NG-nitro-L-arginine (L-NNA), an inhibitor of constitutive and inducible NO synthase. RESULTS Contraction amplitudes secondary to 10(-6) and 10(-5) M PE in endothelium-free preparations were increased by 74% and 36% respectively (P <0.05) in the presence of 2 MAC desflurane compared to controls. In endothelium-free preparations, contraction amplitudes secondary to 10(-6) M PE were increased in the presence of 1 and 2 MAC desflurane by 32% and 18% respectively (P <0.05) and reduced by 16% in the presence of 3 MAC halothane (P <0.05). In endothelium-intact preparations an expected absolute increase in contraction amplitude occurred in the presence of L-NNA but the desflurane effect was detectable both in the presence and absence of L-NNA. CONCLUSION Our results suggest that desflurane may have a local vasoconstrictive effect independent of endothelium and NO synthase activity. The mechanism remains to be determined.
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Affiliation(s)
- M J Griffin
- Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut 06520-8051, USA.
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Durak I, Kavutcu M, Kaçmaz M, Avci A, Horasanli E, Dikmen B, Cimen MY, Oztürk HS. Effects of isoflurane on nitric oxide metabolism and oxidant status of guinea pig myocardium. Acta Anaesthesiol Scand 2001; 45:119-22. [PMID: 11152023 DOI: 10.1034/j.1399-6576.2001.450118.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Volatile anesthetics (VAs) have been shown to enhance myocardial recovery during reperfusion, the mechanism of which has not been clarified yet. It has been supposed that this effect of VAs may appear through antioxidative mechanisms. METHODS Thirty guinea pigs were used in the study. There were three groups with 10 animals in each: I - control, II - isoflurane+oxygen and III - oxygen. Isoflurane (2.0% v/v) and oxygen (100%) mixture was given to the animals via a face mask in the isoflurane+oxygen group at the rate of 21 per min for 30 min a day for three consecutive days. In the oxygen group, oxygen alone (100%) was given under the same conditions as in the isoflurane+oxygen group. At the end of the experiments, the animals were killed and their hearts were removed. In the heart tissues, nitric oxide synthase (NOS) activity, nitric oxide (NO) pool (NO*+NO2-) and malondialdehyde (MDA) levels were measured. RESULTS NOS activity was found to be higher and the NO pool lower in the isoflurane+oxygen group compared with those of control and oxygen groups. In the oxygen group, MDA level was found to be higher compared to the other groups. There was, however, no significant difference between MDA levels of the control and isoflurane+oxygen groups. CONCLUSION Our results suggest that isoflurane prevents peroxidation reactions in heart tissue, possibly by scavenging toxic oxygen radicals produced under hyperoxygenation conditions as occurs with general anesthesia.
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Affiliation(s)
- I Durak
- Department of Biochemistry, Medical Faculty, Ankara University, Turkey.
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Abstract
Little is known about the safety of electroconvulsive therapy (ECT) following any surgical procedure. We present two cases of elderly patients who required treatment with ECT shortly after eye surgery. One patient received ECT 12 days post cataract surgery. The other patient received ECT 1 week post vitrectomy on one eye, and then a few years after that she received ECT 2.5 weeks post cataract surgery on the other eye. There were no complications or adverse events for either patient. We review the existing literature on the effects of ECT on intraocular pressure and discuss the implications on patients who have recently undergone ophthalmic surgery.
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Affiliation(s)
- D A Saad
- Department of Psychiatry and Psychology, Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA
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Stowe DF, O'Brien WC, Chang D, Knop CS, Kampine JP. Reversal of endothelin-induced vasoconstriction by endothelium-dependent and -independent vasodilators in isolated hearts and vascular rings. J Cardiovasc Pharmacol 1997; 29:747-54. [PMID: 9234655 DOI: 10.1097/00005344-199706000-00007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Endothelin (ET-1) is a potent endogenous vasoconstrictor. Several factors increase ET-1 release in vitro and ET-1 levels increase in vivo in situations that damage blood vessels. The aim of this study was to test the activity of several differently acting vasodilator drugs on reversing or attenuating the vasoconstrictor effects of exogenously administered ET-1 in isolated guinea-pig hearts, in isolated rings with intact endothelium from canine middle cerebral and basilar arteries, and from guinea-pig aortas. Vasodilator drugs tested up to maximal concentrations were adenosine (ADE), nitroprusside (NP), acetylcholine (ACH), nifedipine (NIF), and butanedione monoxime (BDM), an excitation-uncoupling agent. Variables measured in isolated hearts included coronary flow, percentage oxygen extraction (% O2E), left ventricular pressure (LVP), and myocardial oxygen consumption. It was found that ADE, NP, ACH, and BDM each attenuated the 60% decrease in coronary flow and 20% increase in % O2E elicited by 0.5 nM ET-1 in isolated hearts, but only BDM restored coronary flow, whereas BDM and ADE both restored % O2E. In isolated rings constricted with 20 nM ET-1, BDM restored tone equivalent to that by papaverine, whereas NP and NIF only attenuated the vasoconstriction elicited by ET-1. Ring experiments also demonstrated that the vasodilatory effect of BDM was independent of nitric oxide-dependent pathways and that BDM attenuated vasoconstriction resulting from increased bath KCl. The study suggests that drugs affecting intracellular Ca2+ with a mechanism of action downstream from cell-membrane receptors or intracellular messengers may be more effective for reversing the constrictor effect of ET-1. NP, however, would be a better clinical choice for reversing ET-1-induced vasoconstriction.
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Affiliation(s)
- D F Stowe
- Department of Anesthesiology, Medical College of Wisconsin, and Veterans Affairs Medical Center, Milwaukee 53226, USA
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Sellke FW, Boyle EM, Verrier ED. Endothelial cell injury in cardiovascular surgery: the pathophysiology of vasomotor dysfunction. Ann Thorac Surg 1996; 62:1222-8. [PMID: 8823128 DOI: 10.1016/0003-4975(96)00538-3] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Impaired vasomotor function has been suggested as playing a role in the pathophysiology of hypertension, diabetes, hypercholesterolemia, and atherosclerosis, all of which are common in cardiovascular surgery patients. In addition to chronic vasomotor dysfunction, alterations in vasomotor tone can result in acute arterial spasm, microcirculatory ischemia, and wide variations in systemic blood pressure. Changes in the health of the vascular endothelium may also impact the late patency of coronary artery bypass grafts, the progression of atherosclerosis in the native coronary circulation, and the long-term success of cardiac transplants. In the resting state the endothelium produces several substances that promote vascular relaxation and inhibition of platelet function, thus assuring the unhindered flow of blood through the capillaries. In response to injury, the endothelium loses some capacity to relax and also releases powerful vasoconstrictive agents. Attempting to understand the contributions that these substances play in the vasomotor dysfunction seen after cardiothoracic surgery is an area of active investigation.
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Affiliation(s)
- F W Sellke
- Department of Surgery of Beth Israel Hospital, Boston, MA 02215, USA
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