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Des-aspartate angiotensin I (DAA-I) reduces endothelial dysfunction in the aorta of the spontaneously hypertensive rat through inhibition of angiotensin II-induced oxidative stress

Loh WM, Ling WC, Murugan DD, Lau YS, Achike FI, Vanhoutte PM, et al.

Vascul Pharmacol, 2015 Aug;71:151-8.
PMID: 25869508 DOI: 10.1016/j.vph.2015.03.011

Des-aspartate angiotensin I (DAA-I), an endogenous nonapeptide, counteracts several effects of angiotensin II on vascular tone. The aim of this study was to investigate the acute protective effect of DAA-I on endothelial function in the spontaneously hypertensive rat (SHR) as well as its effect on angiotensin II-induced contractions and oxidative stress. Aortic rings were incubated with DAA-I (0.1μM) for 30min prior to the assessment of angiotensin II-induced contractions (0.1nM-10μM) in WKY and SHR aortas. Total nitrate and nitrite levels were assessed using a colorimetric method and reactive oxygen species (ROS) were measured by dihydroethidium (DHE) fluorescence and lucigenin-enhanced chemiluminescence. The effect of DAA-I was also assessed against endothelium-dependent and -independent relaxations to acetylcholine and sodium nitroprusside, respectively. Angiotensin II-induced contractions were significantly reduced by DAA-I, losartan and tempol. Incubation with ODQ (soluble guanylyl cyclase inhibitor) and removal of the endothelium prevented the reduction of angiotensin II-induced contractions by DAA-I. Total nitrate and nitrite levels were increased in DAA-I, losartan and tempol treated-SHR tissues while ROS level was reduced by DAA-I and the latter inhibitors. In addition, DAA-I significantly improved the impaired acetylcholine-induced relaxation in SHR aortas whilst sodium nitroprusside-induced endothelium-independent relaxation remained unaffected. The present findings indicate that improvement of endothelial function by DAA-I in the SHR aorta is mediated through endothelium-dependent release of nitric oxide and inhibition of angiotensin II-induced oxidative stress.

Matched MeSH terms: Aorta, Thoracic/drug effects; Aorta, Thoracic/metabolism
Mechanisms underlining gender differences in Phenylephrine contraction of normoglycaemic and short-term Streptozotocin-induced diabetic WKY rat aorta

Aloysius UI, Achike FI, Mustafa MR

Vascul Pharmacol, 2012 Sep-Oct;57(2-4):81-90.
PMID: 22172524 DOI: 10.1016/j.vph.2011.11.009

The female gender reduces the risk, but succumbs more to cardiovascular disease. The hypothesis that short-term (8weeks) Streptozotocin-induced diabetes could produce greater female than male vascular tissue reactivity and the mechanistic basis were explored. Aortic ring responses to Phenylephrine were examined in age- and sex-matched normoglycaemic/diabetic rats. The normoglycaemic male tissue contracted significantly more than the normoglycaemic female and the male/female diabetic tissues. Endothelial-denudation, l-NAME or MB reversed these differences suggesting an EDNO-cGMP dependence. 17β-oestradiol exerted relaxant effect on all endothelium-denuded (and normoglycaemic endothelium-intact male) tissues, but not endothelium-intact normoglycaemic female. The greater male tissue contraction is attributable to absent 17β-oestradiol-modulated relaxation. Indomethacin blockade of COX attenuated male normoglycaemic and female diabetic tissue contraction (both reversed by l-NAME), but augmented diabetic male tissue contraction. These data are consistent with the raised contractile TXA(2) and PGE(2) in normoglycaemic male and diabetic female tissues, and the relaxant PGI(2) in diabetic male (and female). The higher levels of PGI(2) in the normoglycaemic and diabetic female perhaps explain their greater relaxant response to Acetylcholine compared to the respective male. In conclusion, there is an endothelium-dependent gender difference in the effect of short term diabetes on vascular tissue reactivity which is COX mediated.

Matched MeSH terms: Aorta, Thoracic/drug effects*; Aorta, Thoracic/metabolism
Polyphenol-enriched extract of oil palm fronds (Elaeis guineensis) promotes vascular relaxation via endothelium-dependent mechanisms

Abeywardena M, Runnie I, Nizar M, Suhaila M, Head R, Suhaila Momamed

Asia Pac J Clin Nutr, 2002;11 Suppl 7:S467-72.
PMID: 12492636

Plant-based polyphenolic compounds have been reported to possess cardiovascular health benefits. Several dietary sources, including herbs and spices, fruits and vegetables, and tea and wine, contain an array of biologically active compounds that have been shown to be effective in retarding oxidation of low-density lipoproteins (LDL) and promoting vascular relaxation. In the present study four different plant sources, both edible and non-edible, were evaluated for potential activity. Organic extracts enriched in polyphenols were prepared from palm fronds (Elaesis guineensis); lemongrass (Cymbopogon citrates); papaya shoots (Carica papaya) and green chilli (Capsicum frutescenes) and tested for their ability to prevent in vitro oxidation of LDL, and for potential vascular relaxation actions. Rings of rat thoracic aorta and isolated perfused mesenteric vascular beds were mounted in organ baths, contracted using a half-maximal dose of noradrenaline and exposed to cumulative additions of test extracts. Palm frond extract resulted in considerable relaxation (>75%) in both preparations and was found to be endothelium-dependent as removal of endothelium or inhibition of endogenous nitric oxide (NO) led to a total loss in relaxant activity. Lemongrass extract caused a greater relaxation action in the mesenteric preparation compared to aortic rings, and appears to be mediated via NO-independent and non-prostanoid mechanisms. Of the extracts tested, palm fronds also demonstrated the highest antioxidant capacity, as determined by the ferric reducing activity/potential assay, and resulted in a significant delay (P < 0.05) in the oxidation of LDL. Collectively, these preliminary findings lend further support to the potential cardiovascular actions of plant polyphenols and also identify oil palm fronds as containing constituents that promote vascular relaxation via endothelium-dependent mechanisms.

Matched MeSH terms: Aorta/drug effects; Aorta/pathology
Fulltext Involvement of inflammation and adverse vascular remodelling in the blood pressure raising effect of repeatedly heated palm oil in rats

Ng CY, Kamisah Y, Faizah O, Jubri Z, Qodriyah HM, Jaarin K

Int J Vasc Med, 2012;2012:404025.
PMID: 22778962 DOI: 10.1155/2012/404025

Oil thermoxidation during deep frying generates harmful oxidative free radicals that induce inflammation and increase the risk of hypertension. This study aimed to investigate the effect of repeatedly heated palm oil on blood pressure, aortic morphometry, and vascular cell adhesion molecule-1 (VCAM-1) expression in rats. Male Sprague-Dawley rats were divided into five groups: control, fresh palm oil (FPO), one-time-heated palm oil (1HPO), five-time-heated palm oil (5HPO), or ten-time-heated palm oil (10HPO). Feeding duration was six months. Blood pressure was measured at baseline and monthly using tail-cuff method. After six months, the rats were sacrificed and the aortic arches were dissected for morphometric and immunohistochemical analyses. FPO group showed significantly lower blood pressure than all other groups. Blood pressure was increased significantly in 5HPO and 10HPO groups. The aortae of 5HPO and 10HPO groups showed significantly increased thickness and area of intima-media, circumferential wall tension, and VCAM-1 than other groups. Elastic lamellae were disorganised and fragmented in 5HPO- and 10HPO-treated rats. VCAM-1 expression showed a significant positive correlation with blood pressure. In conclusion, prolonged consumption of repeatedly heated palm oil causes blood pressure elevation, adverse remodelling, and increased VCAM-1, which suggests a possible involvement of inflammation.

Matched MeSH terms: Aorta
Fulltext Antihypercholesterolemic and antioxidant efficacies of zerumbone on the formation, development, and establishment of atherosclerosis in cholesterol-fed rabbits

Hemn HO, Noordin MM, Rahman HS, Hazilawati H, Zuki A, Chartrand MS

Drug Des Devel Ther, 2015;9:4173-208.
PMID: 26347047 DOI: 10.2147/DDDT.S76225

Owing to the high incidence of cholesterol-induced cardiovascular disease, particularly atherosclerosis, the current study was designed to investigate the preventive and therapeutic efficacies of dietary zerumbone (ZER) supplementation on the formation and development of atherosclerosis in rabbits fed with a high cholesterol diet. A total of 72 New Zealand white rabbits were divided randomly on two experimental studies carried out 8 weeks apart. The first experiment was designed to investigate the prophylactic efficacy of ZER in preventing early developed atheromatous lesion. The second experimental trial was aimed at investigating the therapeutic effect of ZER in reducing the atherosclerotic lesion progression and establishment. Sudanophilia, histopathological, and ultrastructural changes showed pronounced reduction in the plaque size in ZER-medicated aortas. On the other hand, dietary supplementation of ZER for almost 10 weeks as a prophylactic measure indicated substantially decreasing lipid profile values, and similarly, plaque size in comparison with high-cholesterol non-supplemented rabbits. Furthermore, the results of oxidative stress and antioxidant biomarker evaluation indicated that ZER is a potent antioxidant in suppressing the generation of free radicals in terms of atherosclerosis prevention and treatment. ZER significantly reduced the value of malondialdehyde and augmented the value of superoxide dismutase. In conclusion, our data indicated that dietary supplementation of ZER at doses of 8, 16, and 20 mg/kg alone as a prophylactic measure, and as a supplementary treatment with simvastatin, significantly reduced early plague formation, development, and establishment via significant reduction in serum lipid profile, together with suppression of oxidative damage, and therefore alleviated atherosclerosis lesions.

Matched MeSH terms: Aorta/drug effects; Aorta/metabolism; Aorta/ultrastructure
Acute myelomonocytic leukaemia complicated by an acute aortic thrombosis

Leong KW, Bosco JJ, Shaik IB

Postgrad Med J, 1995 Feb;71(832):112-3.
PMID: 7724422

Acute aortic thrombosis is a rare condition, occurring mainly as a result of trauma or atherosclerosis and occasionally secondary to hypercoagulable states. We report a patient with relapsed acute myeloid leukaemia who developed an unusual complication, acute aortic thrombosis.

Matched MeSH terms: Aorta, Abdominal
Fulltext Establishment of CTPA Local Diagnostic Reference Levels with Noise Magnitude as a Quality Indicator in a Tertiary Care Hospital

Harun HH, Abdul Karim MK, Abd Rahman MA, Abdul Razak HR, Che Isa IN, Harun F

Diagnostics (Basel), 2020 Sep 09;10(9).
PMID: 32916913 DOI: 10.3390/diagnostics10090680

This study aimed to establish the local diagnostic reference levels (LDRLs) of computed tomography pulmonary angiography (CTPA) examinations based on body size with regard to noise magnitude as a quality indicator. The records of 127 patients (55 males and 72 females) who had undergone CTPAs using a 128-slice CT scanner were retrieved. The dose information, scanning acquisition parameters, and patient demographics were recorded in standardized forms. The body size of patients was categorized into three groups based on their anteroposterior body length: P1 (14-19 cm), P2 (19-24 cm), and P3 (24-31 cm), and the radiation dose exposure was statistically compared. The image noise was determined quantitatively by measuring the standard deviation of the region of interest (ROI) at five different arteries-the ascending and descending aorta, pulmonary trunk, and the left and right main pulmonary arteries. We observed that the LDRL values were significantly different between body sizes (p < 0.05), and the median values of the CT dose index volume (CTDIvol) for P1, P2, and P3 were 6.13, 8.3, and 21.40 mGy, respectively. It was noted that the noise reference values were 23.78, 24.26, and 23.97 HU for P1, P2, and P3, respectively, which were not significantly different from each other (p > 0.05). The CTDIvol of 9 mGy and dose length product (DLP) of 329 mGy∙cm in this study were lower than those reported by other studies conducted elsewhere. This study successfully established the LDRLs of a local healthcare institution with the inclusion of the noise magnitude, which is comparable with other established references.

Matched MeSH terms: Aorta, Thoracic
Features of endothelium morphological structure in kidney vessels, coronary arteries and aorta during chronic kidney disease

Topchii II, Kirienko AN, Kirienko DA, Yakovtsova II, Gavriluk AA, Danyliuk SV, et al.

Wiad Lek, 2019;72(7):1269-1273.
PMID: 31398154

OBJECTIVE: Introduction: Vascular endothelium function interruption has the main role among mechanisms of development and progression of chronic kidney disease. In numerous experimental and clinical studies, it was proved that activated vascular endothelium is a structural and functional unit that matches processes of inflammation with intravascular coagulation, fibrinolysis and haemorheological disorders. The aim: To identify special features of endothelium morphological structure in kidney vessels, coronary arteries and aorta during chronic kidney disease.
PATIENTS AND METHODS: Materials and methods: Based on autopsy materials, we conducted a morphological study of patients (n = 20) aged 45 to 55 years who were observed in cardiac and neurological hospitals for 5-7 years. We removed kidney, heart and aorta samples from patients. For the study, a histological and immunohistochemical methods were used.
RESULTS: Results and conclusions: Morphological study of vessels endothelium of kidneys, heart and aorta demonstrated that in the majority of observations intima underwentprofound pathological changes, manifested by different degrees of disorganization of endothelial lining and violations of structural and functional organization of the endotheliocytes, subendothelial layer, basal membrane. These pathological processes in all cases had similar features with the development of immune inflammation. Inflammatory infiltration was represented by macrophages, mast cells, plasma cells. Biological mediators of the presented cells can aggravate the damage to endothelial cells. Indirect signs of low ability to restore the structure of the vessel wall and endothelial lining may be a weak expression of the VEGF and bcl-2 vascular endothelial growth factor.

Matched MeSH terms: Aorta
Fulltext Clinacanthus nutans Leaves Extract Reverts Endothelial Dysfunction in Type 2 Diabetes Rats by Improving Protein Expression of eNOS

Azemi AK, Mokhtar SS, Rasool AHG

Oxid Med Cell Longev, 2020;2020:7572892.
PMID: 32879653 DOI: 10.1155/2020/7572892

Diabetes mellitus is associated with endothelial dysfunction; it causes progressive vascular damage resulting from an impaired endothelium-dependent vasorelaxation. In the diabetes state, presence of hyperglycemia and insulin resistance predisposes to endothelial dysfunction. Clinacanthus nutans, widely used as a traditional medicine for diabetes is reported to have hypoglycemic, hypolipidemic, antioxidant, and anti-inflammatory properties. However, the possibility of C. nutans affecting the vascular endothelial function in diabetes remains unclear. This study was aimed at evaluating the effects of C. nutans methanolic leaves extract (CNME) on endothelial function in a type 2 diabetes (T2DM) rat model. Sixty male Sprague-Dawley rats were divided into five groups (n = 12 per group): nondiabetic control, nondiabetic treated with four weeks of CNME (500 mg/kg/daily), untreated diabetic rats, diabetic treated with metformin (300 mg/kg/daily), and diabetic treated with CNME (500 mg/kg/daily). T2DM was induced by a single intraperitoneal injection of low-dose streptozotocin (STZ) to rats fed with high-fat diet (HFD). Endothelial-dependent and endothelial-independent relaxations and contractions of the thoracic aorta were determined using the organ bath. Aortic endothelial nitric oxide synthase (eNOS) expression was determined using Western blotting. Endothelial-dependent relaxation was reduced in diabetic rats. Both diabetic groups treated with CNME or metformin significantly improved the impairment in endothelium-dependent vasorelaxation; this was associated with increased expression of aortic eNOS protein. CNME- and metformin-treated groups also reduced aortic endothelium-dependent and aortic endothelium-independent contractions in diabetics. Both of these diabetic-treated groups also reduced blood glucose levels and increased body weight compared to the untreated diabetic group. In conclusion, C. nutans improves endothelial-dependent vasodilatation and reduces endothelial-dependent contraction, thus ameliorating endothelial dysfunction in diabetic rats. This may occur due to its effect on increasing eNOS protein expression.

Matched MeSH terms: Aorta, Thoracic/drug effects; Aorta, Thoracic/pathology; Aorta, Thoracic/physiopathology
Fulltext Bilateral Carotid Body Tumours

Amran, A.R., Jayaram, G., Kumar, G.

International Medical Journal Malaysia, 2006;5(1):1-6.
MyJurnal

Paragangliomas are slow growing hypervascular tumour arising from neural crest cell derivatives throughout the body. In the head and neck region, the major paraganglial cells are located at the carotid bifurcation (carotid body), along the ganglia of the vagus nerve and along the nerves supplying the middle ear and jugular bulb. Less common locations include the larynx, orbit, nose and the aortic arch. Carotid body tumours are very rare neoplasms constituting less than 0.5% of all tumours. The true nature of the tumour is established at the time of attempted biopsy or surgical resection, sometimes with disastrous consequences. Only a few of the more than 500 cases reported in the literature have been studied and diagnosed preoperatively. These tumours must be considered in the evaluation of any lateral neck mass, even one located far from the carotid bifurcation. We report a case of bilateral carotid body tumours detected using 16-slice MDHCT in a patient who presented with pulsatile neck swelling for two years. This tumour is rarely malignant; however it produces serious problems by its progressive enlargement and impairment of adjacent structures in the neck. The treatment of choice is surgical resection; preferably to excise this lesion when it is small, because large, very vascular tumours are intimately attached to the carotid vessels and make surgical resection more hazardous. Pre-operative embolization can be performed in large tumours, as to facilitates surgery and reduce complication. In most of the cases, there is strong attachment of the tumour to the carotid arteries. When this is the situation, removal of the tumour means complete excision of both great arteries as well, and the mortality rate is 40 to 45 %. When surgical removal is not feasible, radiotherapy may help to control the tumour growth, although the results have not been encouraging. As it is very slow growing tumour with the growth rate of less than 5 mm per year tumours in old patients with significant risk factors for surgical intervention can be managed by observation alone.

Matched MeSH terms: Aorta, Thoracic
Fulltext An Undiagnosed Non Functioning Retroperitoneum Paraganglioma, Complicating A Gynaecological Surgery; A Case Report

Noraziana, A.W., Hakim, B., Mokhtar, A., Alik, R.

International Medical Journal Malaysia, 2010;9(1):59-61.
MyJurnal

Paragangliomas are uncommon tumors arising from the neuroendocrine elements (chief cells) of the paraganglia and symmetrically distributed along the aorta in close association with the sympathetic chain. Although functional tumors are easier to diagnose due to the clinical fi ndings caused by excess secretion of catecholamines and an elevation of the urinary catecholamine levels, however the diagnosis of nonfunctioning paraganglioma of the retroperitoneum is diffi cult and only few cases have been made before exploratory laparotomy. Although our patient was initially planned and operated by our gynaecological team, the incidental findings had to involve the general surgeons. She is fortunate that the tumour did not show any features of malignancy nor metastasis, however a long time follow up is needed in case of any possible recurrence.

Matched MeSH terms: Aorta
Fulltext Multiple renal arteries with an ascending upward renal Vein of the right kidney: a case report

Al-Shibli S.M.

International Medical Journal Malaysia, 2014;13(1):57-60.
MyJurnal

As it is known; the majority of the human subjects has two renal arteries arising from the abdominal aorta; each will supply one kidney but in 30% of individuals, certain variations can be found. Accessory renal arteries constitute the most common and clinically important of these variations. For our case report, we are presenting one of these different variations that can be found in the blood supply of the kidneys. During dissecting the abdomen of an approximately 65 years-old male cadaver, multiple variations were found. There were double right renal arteries with prehilar branching of the upper renal artery. We found also that the right renal vein ascended upwards obliquely before ending in the lateral aspect of the inferior vena cava. Variation in the renal vessels is relatively common, especially multiple renal arteries, and can go smoothly without any abnormalities with the function of the kidney, but in some situations like renal transplantations, vascular reconstructions, and various surgical and radiological diagnostic techniques, the study of the anatomy of these variations is of crucial importance to decrease the patient morbidity during surgical procedures.

Matched MeSH terms: Aorta, Abdominal
Fulltext Endovascular therapy versus surgery in adult with coarctation of the aorta

Abdulgani, Hafil Budianto, Oemar, Hamed

Medical Health Reviews, 2009;2009(1):43-58.
MyJurnal

Coarctation of the aorta is a congenital anomaly presented by the combination of upper body hypertension and weak or absent femoral pulses. Increased morbidity and shortened life span of infants born with coarctation suggest that the malformation should be treated early in life. Surgical intervention has been recognized as the gold standard of treatment for children born with this defect. Unfortunately, studies in many institutions have shown that the diagnosis of coarctation of the aorta is often missed. As a consequence, many patients with coarctation of the aorta are not detected until adult life. Long-term follow-up of adult patients following surgical intervention for coarctation of the aorta reveals ongoing risks; hence, less invasive endovascular therapy becomes an alternative approach. Literature’s review was performed to compare the results of endovascular therapy (stenting and angioplasty) with surgical techniques to repair adult with coarctation of the aorta. The immediate improvement in hypertension and the morbidity were similar. Although stenting can be expected to show superiority to balloon angioplasty alone, that was not apparent when comparing these two endovascular approaches. The morbidity, mortality, and repeat intervention rates were just as high for stenting as they were for angioplasty or for a combination of both modalities. The majority of surgical complications were minor (i.e., vasculitis, bleeding), whereas the majority of endovascular complications could be considered more severe (i.e., dissection, traumatic aneurysm, stroke). Surgical therapy was associated with a very low risk of restenosis and recurrence, whereas endovascular therapy had a much higher incidence of restenosis and the need for repeat interventions. In conclusion, surgical therapy is superior compared to other modes of interventional therapy for adult with coarctation of the aorta, and it shall remain as current mode of therapy for adult with coarctation of the aorta.

Matched MeSH terms: Aorta
Fulltext Protective effects of defatted dabai peel extracts in hypercholesterolemic rabbits based on histopathological methods

Hock, Eng Khoo, Azrina Azlan, Amin Ismail, Al-Sheraji, Sadek Hassan

Malaysian Journal of Medicine and Health Sciences, 2015;11(2):59-68.
MyJurnal

Defatted dabai peel contains a high amount of anthocyanin. Anthocyanins are known to prevent several
types of disease, including cardiovascular-related complications. This study aimed to describe the
effects of different doses of defatted dabai peel extract by histopathological analyses on lesions in the
liver, kidney, heart and aorta. Histopathology methods were applied to determine the protective effects
of defatted dabai peel extracts against hypercholesterolemia-induced oxidative damages to animal
organs. Haematoxylin and eosin staining was applied for histopathology examination for liver, kidney,
heart and aorta. Data showed that a high dose of defatted dabai extract (3000 mg per day) applied to
hypercholesterolemic rabbits for eight weeks had mild protective effect, especially reducing the severity
of hepatic fibrosis and steatosis of the renal medulla. The high dose of extract supplementation also
reduced inflammation of aorta and formation of atherosclerosis plaque in the cell wall of right ventricle
of the heart. The high dose of defatted dabai peel extract could be a protective agent against oxidative
stress.

Matched MeSH terms: Aorta
Fulltext Undiagnosed bicuspid aortic valve: a silent danger

Ngow, H.A., Wan Khairina, W.M.N.

International Medical Journal Malaysia, 2012;11(2):45-48.
MyJurnal

The normal aortic valve has three leaflets, which are almost equal in size. A bicuspid aortic valve developed as a result of abnormal aortic cusp formation during early embryogenesis. Complications such as valvular stenosis or incompetence are well known. Delayed in identifying the congenital abnormality or the complications may cause morbidity and mortality. We report two cases of congestive cardiac failure as the results of undiagnosed bicuspid aortic valve with severe aortic incompetence. Both young men in their productive age without cardiac risk factors, were unfortunate to present too late. Although one of them was lucky to survive the ordeal, most late presentation ends up gravely. Aortic valve replacement can be offered if early detection is made. Those with severe disease at diagnosis may require a heart transplant.

Matched MeSH terms: Aorta
Effects of citrus leaf extract on aortic vascular reactivity in hypertensive rats fed repeatedly heated vegetable oil

Siti HN, Kamisah Y, Mohamed S, Jaarin K

Appl Physiol Nutr Metab, 2019 04;44(4):373-380.
PMID: 30216735 DOI: 10.1139/apnm-2018-0175

The prolonged intake of diet containing repeatedly heated vegetable oil can cause hypertension in the long run.
In this study, the effects of citrus leaf extract (CLE) supplementation on vascular reactivity, plasma nitrite, and aortic structure in hypertensive rats were investigated by the consumption of repeatedly heated vegetable oil [corrected]. Male Sprague Dawley rats (n = 56) were divided into 7 groups corresponding to the respective diets. For 16 weeks, 1 group was given standard rat chow (control) while other groups were given diets containing 15% w/w of palm oil, fresh palm oil (FPO), palm oil heated 5 times (5HPO), and palm oil heated 10 times (10HPO), with or without the incorporation of 0.15% w/w CLE (FPO+CLE, 5HPO+CLE, or 10HPO+CLE). Plasma nitrite levels were measured before and at 16 weeks of treatment. After 16 weeks, the rats were sacrificed and aortae were harvested for measuring vascular reactivity and for microscopic study. CLE supplementation had significantly reduced the loss of plasma nitrite and attenuated the vasoconstriction response to phenylephrine in the 5HPO group but not in the 10HPO group. However, CLE had no significant effect on the vasorelaxation response to acetylcholine and sodium nitroprusside. The elastic lamellae of tunica media in 5HPO, 10HPO, and 10HPO+CLE groups appeared disorganised and disrupted. Obtained findings suggested that CLE was able to enhance nitric oxide bioavailability that might dampen the vasoconstriction effect of phenylephrine.

Matched MeSH terms: Aorta/drug effects*; Aorta/metabolism; Aorta/physiopathology
Stridor in a Newborn with Double Aortic Arch-A Case Report

Anastasius EJ, Sawali H

Iran J Otorhinolaryngol, 2019 Jan;31(102):61-63.
PMID: 30783601

Introduction: Double aortic arch (DAA) is a congenital anomaly of the aortic arch. It is the most common type of complete vascular ring. When it occurs, the connected segment of the aortic arch and its branches encircle the trachea and esophagus, leading to symptoms related to these two structures.
Case Report: We present a case of a newborn baby who developed biphasic stridor immediately after a normal vaginal delivery. Endoscopic assessment of the trachea revealed a pulsatile narrowing at the level of the thoracic trachea, suggestive of an external compression. A contrast-enhanced computed tomography scan of the thorax with three-dimensional reconstruction confirmed the diagnosis of DAA with compression of the trachea and esophagus.
Conclusion: Clinicians should strongly consider the possibility of a congenital vascular ring compression should an infant with a normal upper airway present with stridor. A precise diagnosis can be made by radiological examination.

Matched MeSH terms: Aorta, Thoracic
Fulltext Moxibustion (ArtemisiaPlant at Acupuncture Point) as Alternative Therapy in Hypertension: A Promising Approach

Siddiqui MJ, Kamarudin MFB, Mohammed Al-Shami AK, Mat So'ad SZ, Jamshed SQ

J Pharm Bioallied Sci, 2017 Oct-Dec;9(4):279-281.
PMID: 29456380 DOI: 10.4103/jpbs.JPBS_24_17

Hypertension is a pathological condition in which the blood pressure is higher than under normal physiological conditions, i.e., 140/90 mmHg or higher. Blood pressure is measured as the force exerted by the blood pumped by the heart against the walls of arteries (aorta) and distributed throughout the body. Use of complementary and alternative medicine as a cure for hypertension is a common phenomenon because of the high risk of cardiovascular complications and kidney diseases caused by conventional Western medicine. It is reported that high blood pressure causes ~49% of myocardial infarction and 62% of strokes. Effective treatment of hypertension is restricted by adverse effects and cost of the medication. Moxibustion is the application of heat by burning a small bundle of tightly bound moxa, to targeted acupoint, and sometimes it is used along with acupuncture. Encouraging results have been reported on randomized trials indicating the efficacy of moxibustion. But more controlled clinical trials are required to further establish the potential efficacy of moxibustion approach in hypertension.

Matched MeSH terms: Aorta
Fulltext Boldine improves endothelial function in diabetic db/db mice through inhibition of angiotensin II-mediated BMP4-oxidative stress cascade

Lau YS, Tian XY, Mustafa MR, Murugan D, Liu J, Zhang Y, et al.

Br J Pharmacol, 2013 Nov;170(6):1190-8.
PMID: 23992296 DOI: 10.1111/bph.12350

Boldine is a potent natural antioxidant present in the leaves and bark of the Chilean boldo tree. Here we assessed the protective effects of boldine on endothelium in a range of models of diabetes, ex vivo and in vitro.

Matched MeSH terms: Aorta, Thoracic/cytology; Aorta, Thoracic/drug effects*; Aorta, Thoracic/physiology
Chronic administration of sodium nitrite prevents hypertension and protects arterial endothelial function by reducing oxidative stress in angiotensin II-infused mice

Ling WC, Mustafa MR, Vanhoutte PM, Murugan DD

Vascul Pharmacol, 2018 03;102:11-20.
PMID: 28552746 DOI: 10.1016/j.vph.2017.05.003

AIM: Endothelial dysfunction accompanied by an increase in oxidative stress is a key event leading to hypertension. As dietary nitrite has been reported to exert antihypertensive effect, the present study investigated whether chronic oral administration of sodium nitrite improves vascular function in conduit and resistance arteries of hypertensive animals with elevated oxidative stress.
METHODS: Sodium nitrite (50mg/L) was given to angiotensin II-infused hypertensive C57BL/6J (eight to ten weeks old) mice for two weeks in the drinking water. Arterial systolic blood pressure was measured using the tail-cuff method. Vascular responsiveness of isolated aortae and renal arteries was studied in wire myographs. The level of nitrite in the plasma and the cyclic guanosine monophosphate (cGMP) content in the arterial wall were determined using commercially available kits. The production of reactive oxygen species (ROS) and the presence of proteins (nitrotyrosine, NOx-2 and NOx-4) involved in ROS generation were evaluated with dihydroethidium (DHE) fluorescence and by Western blotting, respectively.
RESULTS: Chronic administration of sodium nitrite for two weeks to mice with angiotensin II-induced hypertension decreased systolic arterial blood pressure, reversed endothelial dysfunction, increased plasma nitrite level as well as vascular cGMP content. In addition, sodium nitrite treatment also decreased the elevated nitrotyrosine and NOx-4 protein level in angiotensin II-infused hypertensive mice.
CONCLUSIONS: The present study demonstrates that chronic treatment of hypertensive mice with sodium nitrite improves impaired endothelium function in conduit and resistance vessels in addition to its antihypertensive effect, partly through inhibition of ROS production.

Matched MeSH terms: Aorta, Thoracic/drug effects*; Aorta, Thoracic/metabolism; Aorta, Thoracic/physiopathology

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