Hypotensive and Angiotensin-Converting Enzyme Inhibitory Activities of<i>Eisenia fetida</i>Extract in Spontaneously Hypertensive Rats

Mao, Shumei; Li, Chengde

doi:10.1155/2015/349721

Cited by 6 publications

(3 citation statements)

References 36 publications

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“…In our current study, we found there was a negative correlation between the plasma aldosterone concentration and the number of RGCs in the central and peripheral retina. Although a previous study reported finding the plasma aldosterone concentration in normal rats to be approximately 180 pg/ml, 23 our current study found that the plasma aldosterone concentration in rats treated with vehicle was 212 ± 17 pg/ml. This difference suggests that the normal value of aldosterone might depend on the species examined.…”

Section: Discussioncontrasting

confidence: 89%

Elevated plasma aldosterone levels are associated with a reduction in retinal ganglion cell survival

Takasago

Hirooka

Nakano

et al. 2018

J Renin Angiotensin Aldosterone Syst

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Objective:The purpose of this article is to investigate the relationship between the plasma concentration of aldosterone and changes in the number of retinal ganglion cells (RGCs) after systemic administration of aldosterone.Methods:An osmotic minipump that was subcutaneously implanted into the midscapular region of rats administered 40, 80 or 160 μg/kg/day aldosterone or vehicle. Enzyme immunoassay kits were used to measure the plasma aldosterone concentrations two weeks after the systemic administration of aldosterone or vehicle. Six weeks after these systemic administrations, the number of RGCs was measured.Results:The plasma aldosterone concentrations at two weeks after systemic administration of vehicle or 160 μg/kg/day aldosterone were 238 ± 17 pg/ml and 1750 ± 151 pg/ml (748.5% ± 183.2%), respectively. There was a significant decrease in the number of RGCs in the central retina of the rats after the administration of either 80 or 160 μg/kg/day aldosterone. In the peripheral retina, however, there was a significant decrease in the number of RGCs in 40, 80 or 160 μg/kg/day aldosterone. There was a significant correlation between the number of RGCs and plasma aldosterone concentration.Conclusions:After systemic administration of aldosterone, there was a negative correlation between the plasma aldosterone concentration and the number of RGCs.

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Section: Discussioncontrasting

confidence: 89%

Elevated plasma aldosterone levels are associated with a reduction in retinal ganglion cell survival

Takasago

Hirooka

Nakano

et al. 2018

J Renin Angiotensin Aldosterone Syst

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“…In agreement with our observations, the antihypertensive activity and AT1 receptor blocking activity of benzimidazoles like candesartan ( Nagai et al, 2004 ) and substituted benzimidazoles like 5-nitro benzimidazoles ( Shah et al, 2008 ), and 1, 4 or 1, 5 di-substituted benzimidazoles ( Zhu et al, 2014 ) were also reported. SHR are known to have a very high level of angiotensin II expression and downstream AT1 receptor activation for the induction of high blood pressure ( Mao and Li, 2015 ) and hence AT1 receptor blockers were found to be the most frequently reported antihypertensive agent in these models ( Choisy et al, 2015 ).…”

Section: Discussionmentioning

confidence: 99%

Antihypertensive Effect of a Novel Angiotensin II Receptor Blocker Fluorophenyl Benzimidazole: Contribution of cGMP, Voltage-dependent Calcium Channels, and BKCa Channels to Vasorelaxant Mechanisms

et al. 2021

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Background: The current study presents the novel angiotensin II receptor blocker fluorophenyl benzimidazole (FPD) as an antihypertensive agent in the SHR model of hypertension. We investigated the role of cGMP, voltage-dependent L-type calcium channels, and BKCa channels in the vasorelaxant mechanisms of FPD in the rat superior mesenteric artery.Methods: The antihypertensive effect of FPD was examined using an invasive technique measuring blood pressure in SHR animals. Using a myograph, tension measurement was completed in the superior mesenteric artery to elucidate the mechanisms of vasorelaxation involving AT1 receptors, the NO/cGMP pathway, L-type calcium channels, and BKCa channels. Ion flux (Ca2+, K+) studies were conducted in aortic smooth muscle cells. Putative targets proteins were determined by in silico docking studies. A safety evaluation of FPD was carried out using Swiss albino mice.Results: FPD significantly decreased blood pressure in SHR. It relaxed superior mesenteric arteries in a concentration-dependent manner and significantly inhibited angiotensin II-induced contraction. The relaxation response was also mediated by an increase in tissue cGMP levels, inhibition of L-type calcium channels, and the opening of BKCa channels. FPD further enhanced efflux of K+ and inhibited Bay K8644-stimulated Ca2+ influx in aortic smooth muscle cells and docked well in an in silico study with the targets. It was well tolerated in the toxicity study.Conclusion: The present study reports the antihypertensive activity of novel AT-1 receptor blocker FPD at 50 and 100 mg kg−1 with cGMP, L-type calcium channels, and BKCa channels as putative targets of vasorelaxation, and was found safe in oral toxicity.

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“…Sebanyak 1 mL lapisan etil asetat diambil lalu diuapkan pada tangas air. Hasilnya dilarutkan dengan 3 mL aquadeion lalu diukur absorbansinya dengan spektrofotometri uv-sinar tampak pada panjang gelombang 228 nm (Muthia et al 2017, Mao and Li 2015, Jamhari et al 2013, Prasanna et al 2012. Persen inhibisi dihitung melalui persamaan:…”

Section: Pengujian Efek Inhibisi Angiotensin Converting Enzyme (Ace) ...unclassified

Efek Vasodilatasi Dan Inhibisi Angiotensin Converting Enzyme Dari Ekstrak Etanol Dan Fraksi Daun Binahong (Anredera Cordifolia (Ten). V. Steenis)

2017

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ABSTRAKEfek antihipertensi binahong pada model hewan hipertensi yang diinduksi dengan adrenalin dan deksametason telah dibuktikan pada penelitian sebelumnya. Pada penelitian ini, dikaji mekanisme kerja lebih lanjut dari efek antihipertensi ekstrak etanol daun binahong dan fraksinya. Pengujian secara ex vivo dilakukan dengan menggunakan aorta kelinci yang diinduksi dengan norepinefrin, metilen biru- norepinefrin, dan kalium klorida. Efek pemberian ekstrak etanol daun binahong (EEDB), fraksi n-heksana (FH), fraksi etil asetat (FE), dan fraksi air (FA) diamati pada kimograf lalu dihitung persen relaksasi dan waktu relaksasi. Pengujian secara in vitro dilakukan dengan menggunakan Hip-His-Leu sebagai substrat dan mengukur produk yang terbentuk secara spektrofotometri UV-sinar tampak pada panjang gelombang 228 nm. Dari data absorbansi, dihitung persen inhibisi angiotensin converting enzyme (ACE) dan ditentukan nilai IC50. Pada kontraksi yang diinduksi norepinefrin, EEDB, FH, FE, dan FA menunjukkan persen relaksasi berturut-turut sebesar 60,9; 39,2; 48,2; dan 52,5%. Waktu relaksasi pada semua kelompok uji menurun secara signifikan terhadap kelompok yang diinduksi norepinefrin (p<0,05). Pada kontraksi yang diinduksi norepinefrin dengan pretreatmen metilen biru, persen relaksasi yang terjadi akibat pemberian EEDB, FH, FE, dan FA berturut-turut sebesar 21,4; 30,7; 21,6; dan 23,8% serta tidak terjadi penurunan waktu relaksasi. Pada kontraksi yang diinduksi KCl, persen relaksasi yang terjadi akibat pemberian EEDB, FH, FE, dan FA berturut-turut sebesar 42,2; 20,4; 49,1; dan 35,8%, akan tetapi tidak terjadi penurunan waktu relaksasi. Nilai IC50 pada pemberian EEDB, FH, FE, dan FA berturut-turut sebesar 22,63; 242,60; 115,77; dan 97,53 Î¼g/mL. Ekstrak etanol daun binahong memiliki efek vasodilatasi melalui jalur NO, inhibisi kanal kalsium (lemah), dan inhibisi ACE (sedang). Fraksi n-heksana tidak menunjukkan efek inhibisi kanal kalsium dan inhibisi ACE, tetapi menunjukkan efek vasodilatasi melalui jalur NO. Fraksi etil asetat menunjukkan efek vasodilatasi melalui jalur NO, inhibisi kanal kalsium (lemah), serta inhibisi ACE (lemah). Fraksi air menunjukkan efek vasodilatasi melalui jalur NO serta inhibisi ACE (lemah), tetapi tidak menunjukkan efek inhibisi kanal kalsium.Kata kunci: Anredera cordifolia, binahong, vasodilatasi, nitrit oksida, inhibisi kanal kalsium, inhibisi angiotensin converting enzymeVASODILATATION AND ANGIOTENSIN CONVERTING ENZYME INHIBITION EFFECT OF ETHANOL EXTRACT AND FRACTION FROM MADEIRA VINE (ANREDERA CORDIFOLIA (TEN). V. STEENIS) LEAFABSTRACTThe antihypertensive effects of Anredera cordifolia (madeira vine) on adrenaline-induced and dexamethasone-induced hypertensive rat have been demonstrated in previous studies. In this study, mechanism of antihypertensive effect of ethanol extract of madeira vine leaves and its fraction studied further. Ex vivo experiment was performed using rabbit aortic rings induced with norepinephrine, methylene blue-norepinephrine, and potassium chloride. The respond of aortic rings to ethanol extract of madeira vine (EEMV), n-hexane fraction (HF), ethyl acetate fraction (EF), and water fraction (WF) were observed in the kymograph, then percentage of relaxation and relaxation time were calculated from the graph obtained. Angiotensin converting enzyme (ACE) inhibitor activity test was performed in vitro using Hip-His-Leu as the substrate. The product of enzymatic reaction measured using UV-visible spectrophotometry at wavelength 228 nm. From the absorbance data, percentage of enzyme inhibition was calculated and IC50 value was determined. In norepinephrine-induced contraction, EEMV, HF, EF, and WF showed percentage of relaxation 60.9; 39.2; 48.2; and 52.5%, respectively. Relaxation time of all groups were significantly decrease compared to norepinephrine group (p<0.05). In norepinephrine-induced contraction with methylene blue pretreatment, the percent of relaxation were 21.4; 30.7; 21.6; and 23.8%, respectively for EEMV, HF, EF, and WF, and there was no reduction in relaxation time. In KCl-induced contraction, the percentage of relaxation of EEMV, HF, EF, and WF were 42.2; 20.4; 49.1; and 35.8%, respectively, but no reduction in relaxation time. IC50 of EEMV, HF, EF, and WF were 20.76, 198.13, 115.77, and 88.41 Î¼g/mL, respectively. The ethanol extract of madeira vine leaves showed vasodilator effect through the endothelium-dependent pathway, inhibition of calcium channel (weak), and ACE inhibition (moderate). The n-hexane fraction showed no inhibitory effect of calcium channel and ACE, but showed vasodilation effect via endothelium-dependent pathway. Vasodilation effect of ethyl acetate fraction occurred through the endothelium-dependent pathway, inhibition of calcium channel (weak), and ACE inhibition (weak). The water fraction showed vasodilation effect through endothelium-dependent pathway and inhibition of ACE (weak), but did not show calcium channel inhibition effect.Keywords: Anredera cordifolia, madeira vine, vasodilatation, nitric oxide, calcium channel blocker, angiotensin converting enzyme inhibition

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Hypotensive and Angiotensin-Converting Enzyme Inhibitory Activities ofEisenia fetidaExtract in Spontaneously Hypertensive Rats

Cited by 6 publications

References 36 publications

Elevated plasma aldosterone levels are associated with a reduction in retinal ganglion cell survival

Elevated plasma aldosterone levels are associated with a reduction in retinal ganglion cell survival

Antihypertensive Effect of a Novel Angiotensin II Receptor Blocker Fluorophenyl Benzimidazole: Contribution of cGMP, Voltage-dependent Calcium Channels, and BKCa Channels to Vasorelaxant Mechanisms

Efek Vasodilatasi Dan Inhibisi Angiotensin Converting Enzyme Dari Ekstrak Etanol Dan Fraksi Daun Binahong (Anredera Cordifolia (Ten). V. Steenis)

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