iridoids has been researched along with Hypertension* in 9 studies
1 review(s) available for iridoids and Hypertension
1 trial(s) available for iridoids and Hypertension
8 other study(ies) available for iridoids and Hypertension
Article | Year |
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Alterations in Glucose Metabolism During the Transition to Heart Failure: The Contribution of UCP-2.
The cardiac expression of the mitochondrial uncoupling protein (UCP)-2 is increased in patients with heart failure. However, the underlying causes as well as the possible consequences of these alterations during the transition from hypertrophy to heart failure are still unclear. To investigate the role of UCP-2 mechanistically, expression of UCP-2 was silenced by small interfering RNA in adult rat ventricular cardiomyocytes. We demonstrate that a downregulation of UCP-2 by siRNA in cardiomyocytes preserves contractile function in the presence of angiotensin II. Furthermore, silencing of UCP-2 was associated with an upregulation of glucose transporter type (Glut)-4, increased glucose uptake, and reduced intracellular lactate levels, indicating improvement of the oxidative glucose metabolism. To study this adaptation in vivo, spontaneously hypertensive rats served as a model for cardiac hypertrophy due to pressure overload. During compensatory hypertrophy, we found low UCP-2 levels with an upregulation of Glut-4, while the decompensatory state with impaired function was associated with an increase of UCP-2 and reduced Glut-4 expression. By blocking the aldosterone receptor with spironolactone, both cardiac function as well as UCP-2 and Glut-4 expression levels of the compensated phase could be preserved. Furthermore, we were able to confirm this by left ventricular (LV) biopsies of patients with end-stage heart failure. The results of this study show that UCP-2 seems to impact the cardiac glucose metabolism during the transition from hypertrophy to failure by affecting glucose uptake through Glut-4. We suggest that the failing heart could benefit from low UCP-2 levels by improving the efficiency of glucose oxidation. For this reason, UCP-2 inhibition might be a promising therapeutic strategy to prevent the development of heart failure. Topics: Animals; Blood Pressure; Cardiomegaly; Cell Survival; Chronic Disease; Female; Glucose; Glucose Transporter Type 4; Heart Failure; Heart Ventricles; Humans; Hypertension; Iridoids; Male; Mitochondria, Heart; Models, Cardiovascular; Myocytes, Cardiac; Rats, Wistar; Spironolactone; Uncoupling Protein 2 | 2020 |
Geniposide in Gardenia jasminoides var. radicans Makino modulates blood pressure via inhibiting WNK pathway mediated by the estrogen receptors.
To investigate the effects of geniposide in an iridoid found in Gardenia jasminoides var. radicans Makino (GJRM) in spontaneous hypertensive rat (SHR) and explore the possible mechanisms.. In this study, we detected the content of geniposide in GJRM by high-performance liquid chromatography (HPLC). Then, we used acute diuretic experiments to determine whether geniposide has diuretic effect. Moreover, we carried out experiments on SHR to further study the mechanism of hypertension, while real-time PCR, Western blot and immunohistochemistry were used for the experiments in vivo test. Hypotonic model was used for in vitro test.. Our data showed that the content of geniposide in the extract of GJRM is 27.54%. Meanwhile, 50 mg/kg geniposide showed the strongest effect on promoting urine volume. Further study indicated that the extract of GJRM and geniposide could significantly reduce blood pressure and promote the excretion of urine and Na. Collectively, we would suggest that geniposide may potentially be utilized as an adjunct to existing thiazide and thiazide-like diuretics to control hypertension, mainly through inhibiting the activation of the WNK signalling pathway mediated by the estrogen receptor. Topics: Animals; Antihypertensive Agents; Blood Pressure; Cell Line; Disease Models, Animal; Diuresis; Diuretics; Estrogen Receptor alpha; Estrogen Receptor beta; Gardenia; Hypertension; Iridoids; Kidney Tubules, Proximal; Male; Plant Extracts; Protein Serine-Threonine Kinases; Rats, Inbred SHR; Rats, Inbred WKY; Signal Transduction | 2020 |
Oleuropein, unexpected benefits!
Topics: Animals; Anti-Inflammatory Agents; Antioxidants; Blood Pressure; Diet, Mediterranean; Humans; Hypertension; Iridoid Glucosides; Iridoids; Mice; Olea; Oxidative Stress; Parkinson Disease; Phenylethyl Alcohol; Rats | 2017 |
Oleuropein improves mitochondrial function to attenuate oxidative stress by activating the Nrf2 pathway in the hypothalamic paraventricular nucleus of spontaneously hypertensive rats.
Hypertension is associated with increased reactive oxygen species (ROS) production in the paraventricular nucleus (PVN) of the hypothalamus. Oleuropein (OL) has a variety of biochemical roles, including antihypertensive and antioxidative functions. However, there have been few reports on the effects of OL on oxidative stress in the PVN on hypertension. In spontaneously hypertensive rats (SHR), eight-week administration of 60 mg/kg/day of OL significantly reduced blood pressure, pro-inflammatory cytokines and the expression of components of the renin-angiotensin system (RAS) compared with SHR rats treated with saline. Concomitantly, OL inhibited superoxide, and increased the antioxidant defense system in the PVN of SHR. We also found that OL increased mitochondrial biogenesis through mtDNA, PGC-1α, Complex II and Complex IV expression and regulated mitochondrial dynamics through the fusion-related protein Mfn2 and fision-related protein DRP1 to attenuate mitochondrial impairment. Furthermore, the phase II enzyme levels of Nrf2 and its downstream proteins NQO-1 and HO-1 were all markedly increased in the PVN of the OL-treated SHR group compared with the saline-treated SHR rats. Our findings demonstrate that OL administration can protect the PVN of the hypothalamus from oxidative stress by improving mitochondrial function through the activation of the Nrf2-mediated signaling pathway. Topics: Animals; Antihypertensive Agents; Hypertension; Iridoid Glucosides; Iridoids; Male; Mitochondria; NF-E2-Related Factor 2; Oxidative Stress; Paraventricular Hypothalamic Nucleus; Rats; Rats, Inbred SHR; Rats, Inbred WKY; Reactive Oxygen Species; Signal Transduction | 2017 |
Antihypertensive effects of oleuropein-enriched olive leaf extract in spontaneously hypertensive rats.
The effects of chronic consumption of oleuropein-enriched (15% w/w) olive leaf extract (OLE) on blood pressure, endothelial function, and vascular oxidative and inflammatory status in spontaneously hypertensive rats (SHR) were evaluated. Ten Wistar Kyoto rats (WKY) and twenty SHR were randomly assigned to three groups: a control WKY group, a control SHR group and a SHR group treated with OLE (30 mg kg(-1)) for 5 weeks. Long-term administration of OLE reduced systolic blood pressure, heart rate, and cardiac and renal hypertrophy. OLE treatment reversed the impaired aortic endothelium-dependent relaxation to acetylcholine observed in SHR. OLE restored aortic eNOS phosphorylation at Ser-1177 and Thr-495 and increased eNOS activity. OLE eliminated the increased aortic superoxide levels, and reduced the elevated NADPH oxidase activity, as a result of reduced NOX-1 and NOX-2 mRNA levels in SHR. OLE reduced the enhanced vascular TLR4 expression by inhibition of mitogen-activated protein kinase (MAPK) signaling with the subsequent reduction of proinflammatory cytokines. In conclusion, OLE exerts antihypertensive effects on genetic hypertension related to the improvement of vascular function as a result of reduced pro-oxidative and pro-inflammatory status. Topics: Animals; Antihypertensive Agents; Blood Pressure; Endothelium, Vascular; Gene Expression Regulation, Enzymologic; Hypertension; Iridoid Glucosides; Iridoids; NADPH Oxidases; Nitric Oxide Synthase Type II; Olea; Plant Extracts; Plant Leaves; Rats; Rats, Inbred SHR; Reactive Oxygen Species | 2016 |
Genipin ameliorates hypertension-induced renal damage via the angiotensin II-TLR/MyD88/MAPK pathway.
Genipin is a major active component of Fructus Gardenia, which has been widely used in Traditional Chinese Medicine for the treatment of various cardiovascular diseases. The aim of this study was to investigate the potential effects of genipin on hypertension and the related nephropathy and elucidate the underlying mechanisms of action. We first examined the effects of genipin on blood pressure and renal functions in the Spontaneously Hypertensive (SHR) rats. In the subsequent experiments with human mesangial cells (HMCs), the effects of genipin on angiotensin II (Ang II)-induced HMC proliferation, reactive oxygen species (ROS) generation, and cytokine prodution were examined using the MTT method, 2',7'-dichlorohydrofluorescein (DCFH-DA) staining, and the corresponding enzyme-linked immunosorbent assay (ELISA) kits, respectively. The effects of genipin on Ang II-induced activation of the MAPK pathway and up-regulation of TLR2, TLR4, and MyD88 were detected by real-time PCR and Western blot and further validated in MyD88 siRNA-transfected HMCs. Genipin not only significantly lowered blood pressure in SHR rats after an 8-week treatment, but effectively improved renal functions, evidenced by decreased serum creatinine and blood urea nitrogen (BUN), as well as urinary microalbumin (m-ALB) and N-acetyl-beta-d-glucosaminidase (NAG) upon administration with genipin. Mechanistic studies conducted in Ang II-treated HMCs showed that genipin was able to counteract Ang II-induced cell proliferation, ROS generation, and pro-inflammatory responses. These effects may be mediated through the TLR/MyD88/MAPK signaling pathway. These findings provide new insights into the molecular mechanisms of genipin in the treatment of renal damage in hypertension, which merits a further investigation. Topics: Angiotensin II; Animals; Antihypertensive Agents; Blood Pressure; Cell Proliferation; Cytokines; Humans; Hypertension; Iridoids; Kidney; Male; MAP Kinase Signaling System; Mesangial Cells; Myeloid Differentiation Factor 88; Rats, Inbred SHR; Reactive Oxygen Species; Toll-Like Receptor 2; Toll-Like Receptor 4 | 2016 |
Protective effects of Brassica oleracea sprouts extract toward renal damage in high-salt-fed SHRSP: role of AMPK/PPARα/UCP2 axis.
Renal damage precedes occurrence of stroke in high-sodium/low-potassium-fed stroke-prone spontaneously hypertensive rat (SHRSP). We previously reported a marked suppression of uncoupling protein-2 (UCP2) upon high-salt Japanese-style diet in SHRSP kidneys. Vegetable compounds are known to exert protective effects in cardiovascular diseases. We aimed at evaluating the impact of Brassica oleracea sprouts juice toward renal damage in Japanese diet-fed SHRSP and exploring the role of 5'-adenosine monophosphate-activated protein kinase (AMPK)/NAD-dependent deacetylase sirtuin-1 (SIRT1)/peroxisome proliferator-activated receptor-γ coactivator-1α (PGC1α)/peroxisome proliferator-activated receptor-α (PPARα)/UCP2 axis.. SHRSP received Japanese diet for 4 weeks. A group of SHRSP received Japanese diet and B. oleracea. A third group received Japanese diet, B. oleracea, and PPARα inhibitor (GW6471). A group of SHRSP fed with regular diet served as control.. Japanese diet induced marked increases of oxidative stress, inflammation, and proteinuria, along with glomerular and tubular damage, as compared with regular diet. A significant suppression of AMPK/UCP2 pathway was observed. Despite Japanese diet feeding, concomitant administration of B. oleracea prevented oxidative stress accumulation, inflammation, renal damage, and proteinuria. All components of the UCP2 regulatory pathway were significantly increased by B. oleracea. Superoxide dismutase 2 and phosphoendothelial nitric oxide synthase were also stimulated. Addition of PPARα inhibitor to B. oleracea and Japanese diet significantly reduced the B. oleracea beneficial effects. SBP levels were comparable among the different groups of rats.In vitro, UCP2 inhibition by genipin offset the antioxidant effect of B. oleracea in renal mesangial and proximal tubular cells.. B. oleracea administration prevented renal damage in salt-loaded SHRSP, independently from SBP, with parallel stimulation of AMPK/SIRT1/PGC1α/PPARα/UCP2 axis. Stimulation of the latter mechanism may provide relevant renal protective effect and play a therapeutic role in target organ damage progression in hypertension. Topics: AMP-Activated Protein Kinases; Animals; Antioxidants; Blood Pressure; Brassica; Diet; Glomerular Mesangium; Hypertension; Ion Channels; Iridoids; Kidney Diseases; Kidney Glomerulus; Kidney Tubules, Proximal; Mitochondrial Proteins; Oxidative Stress; Plant Extracts; PPAR alpha; Proteinuria; Rats; Rats, Inbred SHR; Seedlings; Sodium Chloride, Dietary; Stroke; Uncoupling Protein 2 | 2015 |
Antihypertensive effect of Eucommia ulmoides Oliv. extracts in spontaneously hypertensive rats.
To investigate the antihypertensive fractions of Eucommia ulmoides Oliv. and their underlying mechanisms in spontaneously hypertensive rats (SHRs).. In vivo study, Eucommia ulmoides lignans (EuL) and Eucommia ulmoides iridoids (EuI) were administrated to Sprague-Dawley (SD) rats and SHRs, and their blood pressures were measured. Plasma level of nitric oxide (NO) was measured by colorimetric method, and renin activity (RA) and plasma concentration of angiotensin II (Ang II) were measured by radioimmunoassay. In vitro study, rat mesenteric artery was treated with EuL and the vessel relaxation responses were determined.. EuL could lower blood pressures of both SD rats and SHR dose-dependently by either intravenous (i.v.) or intragastric (i.g.) administration, but EuI failed to affect blood pressure in the two kinds of rats. Meanwhile, no synergistic effect was observed with the combination of EuL and EuI. The plasma level of NO in SHR treated with EuL 300 mg/kg twice a day was markedly increased. Both plasma RA and Ang II level were decreased with long-term oral treatment of EuL 150 and 300 mg/kg twice a day. In perfusion experiment, EuL relaxed mesenteric artery quickly and dose-dependently and the effect on the artery with and without endothelium was the same.. EuL may be the effective fraction to lowering blood pressure and its antihypertensive effect is probably associated with regulating NO and renin-angiotensin system (RAS) and directly relaxing artery. Topics: Angiotensin II; Animals; Antihypertensive Agents; Blood Pressure; Dose-Response Relationship, Drug; Eucommiaceae; Hypertension; Iridoids; Male; Mesenteric Arteries; Nitric Oxide; Phytotherapy; Plant Bark; Plant Extracts; Rats; Rats, Inbred SHR; Rats, Inbred WKY; Rats, Sprague-Dawley; Renin; Vasodilation | 2010 |