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 ╗ Introduction
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 Table of Contents    
Year : 2015  |  Volume : 47  |  Issue : 3  |  Page : 243-247

A critical review of pharmacological significance of Hydrogen Sulfide in hypertension

1 Department of Physiology, School of Pharmaceutical Sciences, University Sains Malaysia, Penang 11800, Malaysia
2 Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
3 Department of Physiology, University College Cork, Cork, Ireland

Date of Submission21-Oct-2013
Date of Decision08-Dec-2013
Date of Acceptance20-Apr-2015
Date of Web Publication18-May-2015

Correspondence Address:
Dr. Munavvar A Sattar
Department of Physiology, School of Pharmaceutical Sciences, University Sains Malaysia, Penang 11800
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Source of Support: AA is a recipient of an USM fellowship (Teaching) (No. PF-D 0067/11 (R) from the Institute of Postgraduate Students, Universiti Sains Malaysia and is thankfully acknowledged. The Institute of Postgraduate Studies (IPS) is acknowledged for providing USM fellowship (Teaching) to Ashfaq Ahmad (No. PF-D 0067/11 ( R)) and Universiti Sains Malaysia and Ministry of Science Technology & Innovation (MOSTI) Malaysia for providing grant no. 203/PFARMASI/6711452 to Dr. Hassaan A. Rathore for this work., Conflict of Interest: None

DOI: 10.4103/0253-7613.157106

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 ╗ Abstract 

In the family of gas transmitters, hydrogen sulfide (H 2 S) is yet not adequately researched. Known for its rotten egg smell and adverse effects on the brain, lungs, and kidneys for more than 300 years, the vasorelaxant effects of H 2 S on blood vessel was first observed in 1997. Since then, research continued to explore the possible therapeutic effects of H 2 S in hypertension, inflammation, pancreatitis, different types of shock, diabetes, and heart failure. However, a considerable amount of efforts are yet needed to elucidate the mechanisms involved in the therapeutic effects of H 2 S, such as nitric oxide-dependent or independent vasodilation in hypertension and regression of left ventricular hypertrophy. More than a decade of good repute among researchers, H 2 S research has certain results that need to be clarified or reevaluated. H 2 S produces its response by multiple modes of action, such as opening the ATP-sensitive potassium channel, angiotensin-converting enzyme inhibition, and calcium channel blockade. H 2 S is endogenously produced from two sulfur-containing amino acids L-cysteine and L-methionine by the two enzymes cystathionine γ lyase and cystathionine β synthase. Recently, the third enzyme, 3-mercaptopyruvate sulfur transferase, along with cysteine aminotransferase, which is similar to aspartate aminotransferase, has been found to produce H 2 S in the brain. The H 2 S has interested researchers, and a great deal of information is being generated every year. This review aims to provide an update on the developments in the research of H 2 S in hypertension amid the ambiguity in defining the exact role of H 2 S in hypertension because of insufficient number of research results on this area. This critical review on the role of H 2 S in hypertension will clarify the gray areas and highlight its future prospects.

Keywords: 3-3-mercaptopyruvate sulfur transferase, cystathionine γ lyase, cystathionine β synthase, cysteine aminotransferase, hydrogen sulfide, hypertension

How to cite this article:
Ahmad A, Sattar MA, Rathore HA, Khan SA, Lazhari M I, Afzal S, Hashmi F, Abdullah NA, Johns EJ. A critical review of pharmacological significance of Hydrogen Sulfide in hypertension. Indian J Pharmacol 2015;47:243-7

How to cite this URL:
Ahmad A, Sattar MA, Rathore HA, Khan SA, Lazhari M I, Afzal S, Hashmi F, Abdullah NA, Johns EJ. A critical review of pharmacological significance of Hydrogen Sulfide in hypertension. Indian J Pharmacol [serial online] 2015 [cited 2023 May 31];47:243-7. Available from: https://www.ijp-online.com/text.asp?2015/47/3/243/157106

 ╗ Introduction Top

History and Background of Hydrogen Sulfide

A number of gases are produced endogenously in humans and have roles in the pathology of various diseases. Among these gases, nitric oxide (NO) and carbon monoxide (CO) have vital roles in the physiology of the body. Since the last decade, hydrogen sulfide (H 2 S) has captured the interest of scientists because of its significant role in different systems of the body. H 2 S has been known as a toxic gas with rotten egg smell for more than 300 years. As a toxicant, H 2 S mainly damages the brain, kidneys, and lungs. [1] Some studies have also reported the toxic effects of H 2 S on the central nervous system (CNS) and respiratory system. [2],[3],[4] H 2 S is endogenously produced from two sulfur-containing amino acids L-cysteine and L-methionine by the two enzymes cystathionine γ lyse (CSE) and cystathionine β synthase (CBS) as shown in [Figure 1]a and b. [5],[6] Recently, a third enzyme, namely, 3-mercaptopyruvate sulfur transferase (3MST), along with cysteine aminotransferase (CAT), which is similar to aspartate amino transferase, [7],[8] has been shown to produce H 2 S in brain. 3MST is produced by schematic chain reaction from 3-mercaptopyruvate which is also produced by CAT from cysteine and α-ketoglutarate [9],[10] [Figure 1].
Figure 1: (a-c) The schematic presentation of H2S production in the mammalians body by involving three different pathways

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Both the enzymes CSE and CBS are present in mammalian cells and tissues. Previously, CSE has been reported to be responsible for the production of H 2 S in the cardiovascular system (CVS) and kidneys, whereas CBS performs the same function in CNS. [11] Few studies have supported that CSE is dominant in CVS, whereas CBS is dominant in CNS. [12] Both CBS and CSE have been reported to be present in the kidneys, [5],[13] predominantly in predominantly cortical thymoma. [13],[14],[15] However, the mechanism of its production still remains unclear; whether or not the production of H 2 S is induced by CSE or CBS. Expression of both enzymes in the kidneys can lead us to conclude about the production of H 2 S by both enzymes. Recent studies have demonstrated that CSE is also present in endothelial cells of mice. [16] The third enzyme, 3MST, is responsible for H 2 S production and has also been reported to be present in endothelial cells in the thoracic aorta. [9] Recent studies have shown that greater than 90% of the total H 2 S is produced in the brain by 3MST. [9] Based on the literature, different enzymes are involved in the production of H 2 S in different parts of body; for example, H 2 S is predominantly produced in the heart by CSE, [12] both CBS and CSE in the kidneys, [5],[13] and 3MST in the brain by. [9]

DL-propargylglycine (DL-PAG) is an inhibitor of CSE, whereas aminooxyacetic acid is an inhibitor of CBS. Both inhibitors are nonselective and may be responsible for the inhibition of other enzymes. Some selective inhibitors can elaborate the mechanisms of H 2 S. Some mechanisms for long-term control production of H 2 S are coming to light. Long-term regulation of H 2 S seems to be dependent on S-adenosyl-L-methionine, which activates CBS and ultimately leads to the production of H 2 S [9],[10] [Figure 1]c.

The endogenous concentration of circulating H 2 S is 50-160 μM in rats, bovines, and humans. [12],[17] Tissue level has a greater concentration than circulating level. At physiological concentration, H 2 S hyperpolarizes the membranes of localized cells, modulates the neuronal excitability, relaxes the smooth muscles, and controls cell apoptosis or proliferation. [12],[17],[18],[19],[20],[21] In one study, [22] normal concentration of H 2 S in Wistar Kyoto (WKY) rats was measured at 10 μM; however, other studies [18] have demonstrated that the plasma level of H 2 S is 50 μM. The tissue level of H 2 S has been thought to be higher than its plasma level. For example, the physiological concentration of H 2 S in the brain has been documented at 50-160 μM. [23] Significant changes have been observed in the concentration of H 2 S because of various diseases. The H 2 S level decreased below the normal level in the body if coronary heart disease [24] spontaneously hypertensive rats (SHRs); [25] however, the level increased in diabetes and circulatory shock. In carrageenan-induced inflammation model, concentration is increased. [26] Increase in the concentration of H 2 S has also been observed in acute pancreatitis, [27] hemorrhagic shock, [28] and in endotoxin shock. [29],[30] The vasorelaxant effect of H 2 S has been proven, [18] which shows that H 2 S relaxes the isolated aorta at a concentration as low as 18 μM and 60 μM if pretreated with 20 mM KCl or PHE.

Role of Hydrogen Sulfide in Hypertension

The role of H 2 S seems to be partially solved by evaluating different mechanisms; however, researchers have shifted their interest to other gaseous transmitters, such as NO and carbon monoxide. Therefore, the mechanism of H 2 S in hypertension is not exactly accepted.

Studying the role of H 2 S in hypertension chronologically, we were first informed [23] that H 2 S produces vasorelaxation on rat aortic tissue in vitro. In succeeding research, the vasorelaxant effect of H 2 S has been attributed to the opening of the ATP-sensitive potassium (K ATP ) channel; [18] this effect was mimicked by pinacidil (a K ATP channel agonist) and antagonized by glibenclamide (a K ATP channel antagonist). Blood pressure reduction by intravenous (IV) bolus injection of H 2 S was 12-30 mm of Hg. The study under discussion revealed that aortic rings were relaxed by 63% ± 2.2% at a dose of 180 μM, if pretreated with PHE. The vasorelaxation of H 2 S was partially dependent on endothelium and mostly through direct effects on the smooth muscle cells. To further exclude the involvement of NO, the vasorelaxant effects of H 2 S are not blocked by 1H-(1, 2, 4)oxadiazolo [4,3-a]quinoxalin-1-one (ODQ) (an inhibitor of guanylyl cyclase).

The K ATP channel mechanism was confirmed by inducing contractions in the aortic tissue through treating the tissue with low K + (20 mM) and high K + (100 mM); vasorelaxation produced by H 2 S on aortic tissues was observed when pretreated with low K + (20 mM) and high K + (100 mM). The maximum vasorelaxation produced by H 2 S was 90% ± 8.2% and 19% ± 3.9% when pretreated with low K + (20 mM) and high K + (100 mM), respectively.

Hydrogen sulfide produces more relaxation with low K + (20 mM) because of K + conductance. The K + channel opener effect was further verified using 10 mM tetraethylammonium and 100 nM of charybdotoxin or 100 nM iberiotoxin (specific inhibitors of K ca channel), completely inhibiting H 2 S-induced relaxation.

In upcoming years, the vasorelaxation produced by H 2 S was proven to be through a different mechanism than that of NO and CO. [19] Furthermore, the vasorelaxation effect on the vascular tissue by NO is reduced when pretreated with H 2 S. However, the presence of NO does not alter the H2S vascular response. This study also suggests that an additive response can be achieved using NO and H 2 S. A study [31] elaborated that the cardioprotective action of H 2 S mediated by K ATP channel opening is caused by the physiological production of H 2 S in the heart. This study has proven the negative inotropic effects of H 2 S both in vivo and in vitro, [32] and concluded that H 2 S can effectively prevent hypertension in rats when induced by L-N G -nitro arginine methyl ester.

Nitric oxide and CO play important roles in the pathogenesis of hypertension. [33],[34] This mystery was solved. [35] In this study, deficiency in NO and CO has been proven to contribute to the pathogenesis of hypertension. [36],[37] H 2 S has also been reported to play the same role in hypertension because of similar biological activities. [12] In subsequent studies, the level of H 2 S in the plasma and its production rate in seriously hypertensive rats (SHR) was lower than that in WKY rats. Therefore, CSE is a specific enzyme for H 2 S production in the thoracic aorta and its decreased activity in hypertension may lead to less production of H 2 S, resulting in decreased circulating level of H 2 S. [35] The above-mentioned theory proposes that less activity and decreased transcription of CSE results in decreased circulating aortic H 2 S level and that vasoconstriction is a dominant phenomenon over vasorelaxant one. Sodium hydrogen sulfide (NaHS) has been selected as an exogenous source ofH 2 S because of to four reasons. (1) Na + dissociates from HS _ in a NaHS solution, then HS associates with H and produces H 2 S, regardless if the H 2 S solution was prepared by bubbling H 2 S gas or dissolving NaHS. In physiological saline, about one-third of H 2 S exists in the undissociated form (H 2 S), and the remaining two-thirds is HS _ at equilibrium with H 2 S. (2) NaHS enables a more accurate and reproducible measurement of H 2 S concentrations in a solution than by bubbling H 2 S gas. (3) The influence of 1 mM or less sodium ion on the physiological experiments is negligible. (4) NaHS at concentrations used in the current study does not change the pH of the medium. [23] The results of one study [35] suggest that upregulation of H 2 S results in the reduction of SBP in the SHR + NaHS group (158.13 ± 12.52 mm vs. 183.57 ± 11.8 mm of Hg). A study [18] demonstrated that an IV bolus injection of H 2 S at 2.8 μmol/kg and 14 μmol/kg body weight results in a decrease in the mean arterial blood pressure of rats by 12.5 ± 2.1 mmHg and 29.8 ± 7.6 mmHg, respectively. Therefore, the physiological concentration of H 2 S is responsible for maintaining the mean arterial blood pressure. However, the expression of CSE activity decreases with the onset of disease. Based on the findings, [18] the finding that the physiological concentration of H 2 S is responsible for the normal function of CVS is a matter of great interest. The concentration of H 2 S in the body is a predictor of disease. Diseases like hypertension occur when the concentration of H 2 S decreases; however, the opposite occurs in hemorrhagic shock. In a study, [28] induction of hemorrhagic shock results in a prolonged decrease in the mean arterial pressure (MAP) and heart rate (HR). However, data suggest that vasoconstriction is responsible for a hemorrhagic shock because of vasopressin, noradrenaline, and angiotensin II. [38] A reasonable number of previous studies have shown that excessive formation of inducible nitric oxide synthase (iNOS) in hypotension is responsible for hemorrhagic shock; [38],[39] thus, the concentration of H 2 S increases in the induction of hemorrhagic shock. Treatment with inhibitors of H 2 S-producing enzymes CSE and DL-PAG, a suicidal inhibitor, resulted in the rapid and partial restoration of MAP and HR. Previously, glibenclamide (a K + channel blocker) has been proven to perform the same partial but equally effective function after hemorrhagic shock in a rat. [40] A comparative study was conducted [28] to compare the effect of H 2 S with PAG and β-cyano-L-alanine, a reversible inhibitor of CSE, on the blood pressure of rats subjected to hemorrhagic shock.

After many years of earning good repute among researchers, H 2 S research started to intermingle with each other. As a result, few discrepancies that need solutions arise. Two different schools of thought exist between interchangeable production of H 2 S and NO.

In 1997, a study [23] has proven that a low concentration of H 2 S increases the relaxation of smooth muscles by 13-folds. This study also explained that low concentration (30 μM) of H 2 S enhances the vasodilator effect of NO. Therefore, a synergistic response between H 2 S and NO can be the therapeutic outcome in hypertension. This study further elaborated that NO-induced vasorelaxation is specifically for H 2 S, but NO cannot potentiate the vasorelaxant effect of H 2 S.

Another study [19] has proven that NO is responsible for the upregulated production of H 2 S in rats in a dose-dependent manner (1-100 μM), as shown in the following figure.

This study claims that production of H 2 S by NO is narrated by two mechanisms: (1) NO increases CSE activity, which ultimately leads to the production of H 2 S, and (2) NO increases the activity of protein kinase, which is dependent on cyclic guanosine monophosphate, thereby increasing CSE protein. Another study [41] also supported the concept. [18] Another study [12] elaborated on the release of H 2 S by NO.

A growing body of evidence [42] has proven that H 2 S as a cofactor is responsible for the generation of NO from nitrite.

In his previous studies in 2002, Grossi L and coworkers[43] documented the interaction between hydrogen sulfide and NO resulting in the formation of the intermediate compound nitrosothiol, which releases NO through hemolysis. In his next experimentation, [44] proposed the mechanism of NO production from sodium nitroprusside. In 2006[45] Whiteman and coworkers have proven that the interaction between two gasotransmitters results in the formation of nitrosothiol and the release of only a small portion of NO unless an antioxidant is involved. These findings contradict those of other studies, [19],[43],[44] which demonstrate that the interaction between NO and H 2 S enhances vasodilatation.

In the battle of the interchangeable production of H 2 S and NO, another finding cropped up, supporting the claim that H 2 S is responsible for the direct inhibition of endothelial nitric oxide synthase (eNOS). [46]

Endothelial nitric oxide synthase is responsible for the production of NO in endothelial cells. This theory is born out of the result of the first school of thought, which proposed that NO can potentiate the response of H 2 S, but NO can do this. Kubo S and coworkers[46] have elaborated that H 2 S is responsible for the inhibition of eNOS, as well as iNOS and nNOS. They further strengthened the results of their study by explaining that H 2 S and tetrahydrobiopterin (BH 4 ) reverse the H 2 S inhibition of eNOS and nNOS, but not iNOS.

A study in 2006 [47] elaborated that the intermediate complex formed from the interaction between H 2 S and NO has no vasorelaxant effect; H 2 S was responsible for the regulation of NO. This study concluded that H 2 S inhibits the vasorelaxant effect of NO.

A decrease in H 2 S concentration results in over stimulation of β adrenoreceptor. H 2 S inhibits the activity of β adrenoreceptor by inhibiting adenylyl cyclase. [48] The H 2 S has also been reported to inhibit the L-type Ca ++ channels in cardiomyocyte, which leads to a decrease in contractility, thereby revealing the Ca ++ channel-blocking mechanism of H 2 S. [49] In the same year, H 2 S has been found to have the ability to block the angiotensin-converting enzyme and responsible for additive vasorelaxant response leading to the inhibition of angiotensin II production, ultimately resulting in reduced degradation of bradykinin.

A related study in 2010 [50] reported that eNOS and neuronal nitric oxide synthase (NOS) activation is important to produce a cardioprotective response. The cardioprotective response of NOS family mentioned in studies by Yong QC and Minamishima S and co workers[50],[51] is contrary to the results by Kubo S and coworkers.[46]

Another area of interest is the formation of the intermediate complex nitrosothiol, which is responsible for the vasorelaxant effect in the blood vessels through interaction between two gasotransmitters, H 2 S and NO. [23],[45] The presence of this intermediate molecule, nitrosothiol, has not been fully confirmed and has been considered as a possible molecule for the said action. A previously mentioned study [47] has stated that the intermediate molecule is nitrosothiol but has no vasorelaxant effect in vivo and in vitro. Another school of thought [50] has reported that the interaction between NO and H 2 S leads to the formation of the nitroxyl group; nitroxyl has been reported to be involved in positive inotropic and vasodilation activities. [52] These results support the evidence that HNO/NO produce positive inotropic and lusitropic effects (independent of β-adrenergic stimulation) in a failing heart. [31]

Most recently, a group of researchers studied the role of H 2 S in hypertension along with diabetes [53] and emphasized that H 2 S improves the renal blood flow by reducing renal vasculature resistance through vasodilation. The same group of researchers extended their study to investigate the role of H 2 S in cardiac protection in dihydroxycortisone acetate-induced hypertension and SHR combined with diabetes. [54] They showed the cardiac protection role of H 2 S by reducing HR and vasodilation.

Future Prospects

In view of the above-mentioned literature review, many things remain to be explored and many questions still to be answered. One of the major ambiguities is the interchangeable production of H 2 S and NO.

  • Future studies must verify whether the intermediate molecule formed as a result of interaction between NO and H 2 S is nitroxyl or nitrosthiol or both. If both molecules are present; then, which one is responsible for the vasorelaxant effect?
  • Concentration of H 2 S decreased in hypertension. Is it a cause or consequence of the disease?
  • H 2 S acts by vasodilatation, so α blocking effect can be investigated
  • BH 4 and H 2 S effects in hypertension can be studied
  • The molecular mechanism of H 2 S can be studied using reverse transcription polymerase chain reaction
  • Some selective inhibitors can be introduced to avoid inhibition of unwanted enzymes
  • Releasers of H 2 S introduced as present releasers are inconsistent and have sustained-release property.

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