The definition of hypertension (HTN) is when office systolic blood pressure (SBP) and/or diastolic blood pressure (DBP) is equal or greater than 140 mmHg, and 90 mmHg respectively . HTN is often called “the silent killer”. If HTN is left untreated, end organ damage may occur . People with elevated blood pressure (BP) may face some major risk of being affected by coronary artery disease with the following complications e.g., blindness in diabetic patients, heart failure, renal diseases, and stroke . 972 million people had HTN in 2000 and this number was predicted to be about 1.56 billion in 2025 . Obesity, unhealthy diet, tobacco use, physical inactivity, and HTN are some factors that increase the risk of CVDs . Reducing SBP by 5 mmHg is shown to lower mortality rate by 9%, 14%, and 7% respectively for coronary heart disease, stroke, and in total .
Until now, there are different antihypertensive therapies available, such as: ACE (classified as EC220.127.116.11) inhibitors, angiotensin receptor blocker (ARB), beta blockers, diuretics, and also CCBs  . They show their antihypertensive effect by controlling cardiac output (CO) (affecting stroke volume and heart rate), and peripheral or systemic vascular resistance.
Impairment in production of nitric oxide (NO) is a very common reason behind endothelial dysfunction, which leads to HTN  . Figure 1 shows that, endothelial NO synthase (eNOS) produces NO from L-arginine in the blood vessels to control cardiovascular function . High BP was induced due to chronic blocking of NO after administrating Nω-Nitro-l-arginine methyl ester (l-NAME) depending upon dose and time . l-NAME contributes to endothelial dysfunction in resistant vessels by decreasing metabolites of NO present in plasma and downregulating expression of eNOS protein .
Oxidative stress also promotes HTN pathogenesis . In a rat model of NO depletion-induced hypertension, excess reactive oxygen species (ROS) and declined amount of endogenous antioxidant enzymes have been found . High amount of vascular superoxide ( ), malondialdehyde (MDA), and plasma protein carbonyl were found in NO deficient hypertensive rats  . quenches NO to produce peroxynitrite (ONOO−) directly and decreases NO bioavailability .
Again, l-NAME causes overproduction of ROS and activates the renin-angiotensin system (RAS)  . Angiotensin II (Ang-II) is a potential vasoconstrictor and for that as shown in Figure 2, RAS is a compulsory factor in pathogenesis of HTN . Renin is released by renal artery constriction and Ang-II
Figure 1. The mechanism of action of Nitrates, and nitrites that increase NO in vascular smooth muscle cells (VSMC). Steps producing vascular contraction are presented with red arrows, and those causing vascular relaxation are displayed with blue arrows . MLCK* = activated myosin light-chain kinase; GC* = activated guanylyl cyclase or guanylate cyclase; PDE = phosphodiesterase.
production is increased by activating RAS in NO deficient hypertensive rats  . In l-NAME treated rats, Ang-II stimulates the Ang-II type 1 receptor (AT1R) which produces activated by nicotinamide adenine dinucleotide phosphate (NADPH)-oxidase . Elevated ACE, cardiac and plasma Ang-II, and AT1R expression also confirmed RAS stimulation in those above-mentioned rats .
RAS is also a vital factor because chronic NO inhibition results in arterial remodeling and AT1R blockers prevent that . Vascular remodeling occurs by Ang-II binding to AT1R and activating serine/threonine kinase (Akt), one of its own intracellular downstream signaling protein responsible for Ang-II driven proliferation in VSMC . Signal transducers and activators of transcription protein get phosphorylated by Janus kinases induced by AT1R activation that causes vascular proliferation and remodeling .
Figure 2. Sites of action of drugs that interfere with the RAS, also known as the renin-angiotensin-aldosterone system (RAAS) .
Despite using these agents, many patients cannot control their high BP . HTN cannot be effectively managed in about 30% of the patients who comply with prescription therapies . The available antihypertensive agents are not successful in all the cases along with disease severity . These agents are categorized as combination therapy, costly and their ambiguous regimen of cure decreases drug adherence and may also surge adverse effects as well as drug interactions . Among these, ACE inhibitors cause bronchospasm and cough ; ACE inhibitors and CCBs can cause angioedema with upper respiratory tract obstruction ; CCBs also increase the risk of cancer by inhibiting the growth of vascular cells and angiogenic growth factors due to increasing apoptosis ; beta blockers induce side effects related to central nervous system . Dyspnea, headache, edema, cough, hair loss, and flushes are also reported as side effects of antihypertensive drugs . So, the acceptance of alternative therapy is increasing day by day, as natural herbal products using medicinal plants show fewer side effects . Numerous of them have the potential for therapy of CVDs including, HTN, arrhythmia, and venous insufficiency .
The goal of our work is to accumulate various phytoconstituents that exhibit in vitro and in vivo antihypertensive effects so that they can be used to make safe, patient-adhered, low-cost antihypertensive therapy with preferable minimum side effects. Combination of these natural compounds can also be therapeutic as more than one compound, responsible for antihypertensive effect, are often found in extracts. Our review includes 63 species of plants from 37 family, plant parts used for making extracts, types of extract and animals used for these experiment, antihypertensive effect of the extracts as well as 74 confirmed antihypertensive compounds isolated from these extracts with their dosage and mechanism of action.
2. Discussion about Promising Anti-Hypertensive Plants
Herbal medicine is a tremendous source for seeking out novel therapeutic compounds for numerous diseases. The idea of generating medicine from scratch had originally come out from the traditional uses of herbs and plants by our fellow ancestor to cure many of their ailments. Herbal medicines are quite preferable among people for its significantly low side effects and also the belief regarding nature made.
Traditional use of some plants like Cocos nucifera Linn (Arecaceae), Curcuma domestica (Zingiberaceae), Terminalia bellerica Roxb. (Combretaceae) etc. are well known for treating HTN. Aim of this article is highlighting and compiling the data regarding chemo-profiles, pharmacology of various plant species used to treat HTN. Information regarding plant species is collected from online resources and journals such as PubMed, Google Scholar, SciFinder, ScienceDirect and so on. Table 1 illustrates a comprehensive overview of phytoconstituents, dosage, use, extracts of potential medicinal plants with prominent anti-hypertensive activity.
Among the described compounds, we think four of the compounds were therapeutically efficient. The first one, tilianin which is derived from Agastache mexicana, demonstrated dose-dependent anti-hypertensive effects, with an ED50 of 53.51 mg/kg which was lower than the LD50 of 6624 mg/kg, offers a wide spectrum of pharmacology responses. In addition, this study provides evidence about safety and efficacy of tilianin as antihypertensive agent, as well as, claims of no damage at physiologic, functional and cellular levels in rodent models . The next one is naringenin, isolated from Cochlospermum vitifolium, exhibit a statistically significant dose-dependent decay on SBP (control: 184.00 mmHg vs. sample: 154.93 mmHg) after 24 h post-administration at 50 mg/kg, and also, a significant decrease of SBP (control: 184.00 mmHg vs. sample: 142.64 mmHg) and DBP (control: 159.62 mmHg vs. sample: 122.05 mmHg) at 160 mg/kg . Curcumin nanoemulsion is our favorite choice, prepared from Curcuma domestica and having a 71.166% inhibition (after corrections) on HMGCR (a liver enzyme that contributes to cholesterol synthesis) to assess antihypercholesterolemic activity when compared to pravastatin. Curcumin:
1) Inhibits hepatic HMG-CoA activity and lowers HMGR gene expression (that produces the HMG-CoA enzyme).
2) Suppresses triglyceride and cholesterol accumulation in the liver due to its antihyperlipidemic properties.
3) Enhances PPARα gene expression that regulates fatty acid oxidation.
Table 1. Anti-hypertensive plant species with isolated phytochemicals and their mechanism of action.
4) Elevates the transcription of the LXRα gene, which controls the CYP7A1 enzyme (encoding cholesterol-7a-hydroxlylase, an enzyme that participates in converting cholesterol to bile acids before excretion).
5) Prevents atherosclerotic lesion formation in the atherogenic diet-fed mice, as evidenced by a decrease in the atherogenic indicator and an increase in the % ratio of HDL and total cholesterol .
In comparison to pure curcumin, curcumin nanoemulsion demonstrated a higher rate of ACE inhibition, which suggests that higher inhibition activity of curcumin exerted by the nanoemulsion carrier system was caused by improving its solubility . The last one 2,7-dihydroxy-3,4,9-trimethoxyphenanthrene, obtained from Laelia anceps, caused relaxant activity on norepinephrine precontracted aortic rings with Emax of 90% ± 1.35% (with endothelium) and 96.45% ± 1.2% (without endothelium) .
3. Observed Compounds Having BP Lowering Properties
The discussed antihypertensive compounds, structure demonstrated in Figures 3-7, are 31 types of compounds, such as 1) anthocyanidin (cyanidin-3-O-rutinoside), 2) anthocyanin (anthocyanin fraction), 3) biogenic amine (acetylcholine), 4) catecholamines (L-3,4-dihydroxyphenylalanine), 5) chalcones (marein, coreopsis chalcones), 6) chromenes (methylripariochromene A, acetovanillochromene, orthochromene A), 7) cinnamates (cynarin, caffeic acid, cinnamic acid), 8) coumarins (6,7,8-trimethoxycoumarin, 6,7-dimethoxycoumarin), 9) cyclic acid glucoside (edulilic acid), 10) diarylheptanoid (curcumin), 11) dihydrophenanthrene (2,7-dihydroxy-3,4,9-trimethoxyphenanthrene), 12) flavones (apigenin, vicenin-2, orientin, isoorientin, isovitexin, luteolin), 13) flavonols (quercetin, taxifolin, 3-O-methylquercetine, rutin, quercetine glycosides, 5-hydroxy-3,4',7-tri- methoxyflavone, verbenacoside, isoquercitrin), 14) flavonoid glucosides (tilianin,
Figure 3. Reported compounds from medicinal plants manifest anti-hypertensive activity.
Figure 4. Reported compounds from medicinal plants manifest anti-hypertensive activity.
Figure 5. Reported compounds from medicinal plants manifest anti-hypertensive activity.
Figure 6. Reported compounds from medicinal plants manifest anti-hypertensive activity.
Figure 7. Reported compounds from medicinal plants manifest anti-hypertensive activity.
quercetagetin-7-O-glucoside, flavanomarein, isosinensin), 15) flavan 3-ols (catechin, epicatechin), 16) flavanones (naringenin, isoaromadendrin), 17) hydroxybenzoate ether (vanillic acid), 18) isoflavone (genistein), 19) isoquinoline alkaloid (berberine), 20) lignan glucoside (secoisolariciresinol diglucoside), 21) phenolic acid, 22) phenylpropanoids (3,4 Dicaffeoylquinic acid, 3,5-Dicaffeoyl- quinic acid, 4,5-Dicaffeoylquinic acid, chlorogenic acid, ferulic acid, rosmarinic acid), 23) polyphenolic flavonoid (theaflavin-3,3'-digallate), 24) proanthocyanidins (procyanidin B5, procyanidin B3, procyanidin B2, procyanidin C1), 25) sesquiterpenes (spathulenol), 26) steroidal trisaccharide (Nuatigenin-3-O-β- chacotriose), 27) tannins and galloyl derivatives (glucogallin, gallic acid, galloylshikimic acid, methyl gallate, digalloylquinic acid, digallic acid, trigalloylglucose, tetragalloylquinic acid, 6-O-galloyl-D-glucose), 28) thiocyanate (erucin), 29) triterpene (momordin Іb), 30) triterpenoids (22α-hydroxychiisanogenin, chiisanogenin, ursolic acid), and 31) triterpenoid saponins (22α-hydroxychiisanoside, chiisanoside). Highest number of compounds are tannins and galloyl derivatives, flavonols, flavones, phenylpropanoids, proanthocyanidins and flavonoid glucosides.
Structure of the compounds reveals that most of the compounds possess heterocyclic oxygen atom which is thought to exert the desired antihypertensive or antioxidative activities. The possible way would be chelating with the zinc atom present in the center of the ACE I.
The goal of our research is to let everyone know that there are an ample number of natural compounds that can be made into antihypertensive therapies. We noticed that the majority of the researches focused on the effect of the extracts on antihypertensive therapy along with the mechanism of action and more than half of them elucidated structures of compounds responsible for the activity. As a result, expanding studies into mechanisms and structure elucidation can contribute to the development of new drugs. 63 plant species from 37 families and 74 isolated compounds are reviewed here. Among them, tilianin, naringenin, curcumin nanoemulsion, 2,7-dihydroxy-3,4,9-trimethoxyphenanthrene are the topmost candidate for producing antihypertensive therapy from natural products in a safe, efficient, and patient adhering way. On the other hand, relaxation of blood vessels, formation of NO, blockage of calcium channels, increase in potassium, suppression of the renin-angiotensin pathway, activation of intracellular cGMP, and inactivation of the sympathetic system are mostly the mechanisms discovered in these medicinal plants for antihypertensive activity. Depending upon the side effects of the ongoing therapies, we think it is high time that the pharmaceuticals took the appropriate steps to synthesize effective drug candidate from these phytochemicals that can reach every human being’s doorway. Further studies of the rest of the compounds could also lead to promising antihypertensive therapies.
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