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Review

Hydrogen Sulfide in Hypertension and Kidney Disease of Developmental Origins

by
Chien-Ning Hsu
1 and
You-Lin Tain
2,3,*
1
Department of Pharmacy, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan
2
Departments of Pediatrics, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan
3
Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2018, 19(5), 1438; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms19051438
Submission received: 12 April 2018 / Revised: 1 May 2018 / Accepted: 9 May 2018 / Published: 11 May 2018
(This article belongs to the Special Issue Therapeutic Aspects of Gasotransmitters in Cardiovascular and Renal Disease)
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Abstract

:
Adverse environments occurring during kidney development may produce long-term programming effects, namely renal programming, to create increased vulnerability to the development of later-life hypertension and kidney disease. Conversely, reprogramming is a strategy aimed at reversing the programming processes in early life, even before the onset of clinical symptoms, which may counter the rising epidemic of hypertension and kidney disease. Hydrogen sulfide (H2S), the third gasotransmitter, plays a key role in blood pressure regulation and renal physiology. This review will first present the role of H2S in the renal system and provide evidence for the links between H2S signaling and the underlying mechanisms of renal programming, including the renin–angiotensin system, oxidative stress, nutrient-sensing signals, sodium transporters, and epigenetic regulation. This will be followed by potential H2S treatment modalities that may serve as reprogramming strategies to prevent hypertension and kidney disease of developmental origins. These H2S treatment modalities include precursors for H2S synthesis, H2S donors, and natural plant-derived compounds. Despite emerging evidence from experimental studies in support of reprogramming strategies targeting the H2S signaling pathway to protect against hypertension and kidney disease of developmental origins, these results need further clinical translation.

1. DOHaD Concept: Hypertension and Kidney Disease of Developmental Origins

One in three adults worldwide has high blood pressure (BP). The prevalence of hypertension is even higher among patients with kidney disease. Conversely, kidney disease is the most common form of secondary hypertension. In addition to sharing many common risk factors, hypertension and kidney disease could be the cause and consequence of each other. Hypertension as well as kidney disease, when found early, can be treated to prevent more related disorders and serious complications. Environmental factors in fetal and infantile life can be important early origins of adult disorders due to fetal programming that permanently shapes the body’s morphology and function and contributes to adult disease. This idea is framed as the developmental origins of health and disease (DOHaD) [1]. Notably, following the concept of DOHaD, both of these disorders may originate from adverse early-life environmental insults [2,3,4].
Kidneys play a decisive role in blood pressure (BP) regulation. Adverse environments occurring during nephrogenesis may produce long-term programming effects on the structure and/or function of the kidney, formally known as renal programming [5], which may increase the vulnerability to developing hypertension and kidney disease in adulthood. Conversely, reprogramming, a strategy aimed at reversing the initial programming processes, is afforded by the DOHaD concept to shift therapeutic interventions from adulthood to early life, even before the onset of clinical symptoms [6]. A growing body of evidence suggests that hydrogen sulfide (H2S) plays a crucial role in the normal physiology and pathogenesis of many disorders, and many therapeutic targets exist for H2S therapy [7,8]. Based on the two aspects of the DOHaD concept, this review will first present the evidence for the programming mechanisms that may lead to hypertension and kidney disease of developmental origins, with a focus on the kidney. This will be followed by potential pharmacological interventions targeting H2S signaling that may serve as a reprogramming strategy to counter the growing epidemic of hypertension and kidney disease.

2. Hydrogen Sulfide in Renal System

2.1. H2S Production and Biological Function

H2S, the third gasotransmitter, next to nitric oxide (NO) and carbon monoxide (CO), plays a key role in BP control and renal physiology [7,8,9]. The production of H2S can occur via two pathways, enzymatic and nonenzymatic. Enzymatic synthesis of H2S from l-cysteine occurs through three enzymes, cystathionine β-synthase (CBS), cystathionine γ-lyase (CSE), and 3-mercaptopyruvate sulphurtransferase (3MST), which work together with cysteine amino transferase (CAT) [7]. l-cysteine serves as a substrate for both CBS and CSE to form H2S. CBS and CSE can generate H2S using many different substrates. CBS catalyzes homocysteine and serine to generate cystathionine. CSE catalyzes l-cysteine to produce pyruvate, H2S, and ammonia. CSE also breaks down cystathionine into l-cysteine, α-ketobutyrate, and ammonia. In an alternative pathway, CAT and D-amino acid oxidase (DAO) provide 3-mercaptopyruvate (3MP) for 3MST to produce H2S. Additionally, d-cysteine can be metabolized by DAO to generate H2S in the kidney [10]. In the presence of α-ketoglutarate, CAT metabolizes l-cysteine to form 3MP, whereas DAO produces 3MP from d-cysteine. All of these H2S-generating enzymes are expressed abundantly in the kidney. Interestingly, renal production of H2S from d-cysteine is approximately 80 times greater than that from l-cysteine [10]. Alternatively, nonenzymatic production of H2S occurs through glucose, glutathione, inorganic and organic polysulfides, and elemental sulfur. The biochemical pathways related to the H2S synthesis are illustrated in Figure 1.
H2S has diverse and widespread biological functions, including vasodilatation, mitochondria bioenergetics, metabolic modulation, renal excretory function, angiogenesis, anti-inflammation, antioxidant, and antiapoptosis [7,8,9]. Until recently, the biological mechanisms of H2S signaling have been incompletely understood. One pathway for H2S signaling is through protein sulfhydration by the formation of a persulfide bond to the reactive cysteine residues of target proteins [11]. There is some evidence that H2S signaling regulates physiological processes via sulfhydration, but the mechanisms involved are still not well characterized.

2.2. Antihypertensive and Renoprotective Effects of H2S

In the spontaneously hypertensive rat (SHR), a commonly used genetic hypertensive model, H2S deficiency appears prior to the development of hypertension, whereas the administration of exogenous H2S donor (NaHS) protects SHRs against hypertension [12]. The contribution of H2S deficiency in hypertension has been studied in other models of hypertension, including the renovascular hypertensive model [13], NO-deficient rats [14], and Dahl salt-sensitive rats [15]. In agreement with these studies, CSE knockout mice have also been found to have reduced levels of H2S and hypertension [16]. However, this could not be confirmed in another type of CSE knockout mouse model on a different genetic background [17]. H2S signaling deficiencies have also been associated with various kidney diseases, such as renal ischemia/reperfusion injury, obstructive nephropathy, diabetic nephropathy, hypertensive nephropathy, and the 5/6 nephrectomy rat model of chronic kidney disease. These models have been reviewed elsewhere [18,19]. Conversely, a number of recent studies stress the protective role of exogenous and endogenous H2S on hypertension and kidney disease, and this has also been reviewed elsewhere [20,21,22]. However, limited information is available on whether these beneficial mechanisms could be programmed in response to early-life insults in the kidney, to reduce the vulnerability to developing later hypertension and kidney disease.

3. Common Mechanisms Link H2S to Renal Programming

Though a variety of organ systems can be programmed in response to early-life adverse environmental insults, renal programming is considered crucial in the development of hypertension and kidney disease [4,5,6]. Despite the diversity of early-life insults, emerging evidence indicates that there may be common mechanisms underlying renal programming which lead to the pathogenesis of hypertension and kidney disease of developmental origins. Though the common pathogenic mechanisms are still inconclusive, animal models have provided insight on particular pathways including the renin–angiotensin system (RAS), oxidative stress, nutrient-sensing signals, dysregulation of sodium transporters, and epigenetic regulation [2,3,4,5,6,23]. Notably, these extensive experimental animal studies have demonstrated interplay between H2S and the abovementioned mechanisms. Each of these examples will be discussed in turn.

3.1. Renin–Angiotensin System

The RAS is a well-known hormonal cascade controlling BP and kidney development [24,25]. Currently, there are two main axes of the RAS: (1) the angiotensin-converting enzyme (ACE)–angiotensin (Ang) II–angiotensin type 1 receptor (AT1R) classical axis and (2) the ACE2–angiotensin (1–7)–Mas receptor axis [24]. Both axes have been examined in relation to their impacts on fetal programming [26,27]. There is a biphasic response with reduced classical RAS expression at birth, which becomes normalized with age [5]. Under pathophysiological scenarios where this normalization overcompensates, early-life renal programming subsequently activates the classical RAS, resulting in hypertension and kidney disease development in later life [5]. Conversely, early blockade of the classical RAS has been shown to prevent the development of hypertension [28,29,30]. These observations support the view that RAS may be an underlying mechanism involved in renal programming and the development of hypertension and kidney disease. Decreased H2S levels or downregulation of H2S-generating enzymes have been found in some hypertensive models with activation of the RAS [31,32]. Exogeneous H2S administration has been shown to suppress renin release [32], downregulate renal mRNA expression of Ren, Atp6ap2, Agt, Ace, and Agtr1a [33], and decrease protein expression of AT1R [34], resulting in protection from hypertension. Nevertheless, the detailed mechanisms underlying the modulation of RAS by H2S contributing to the protection of programmed kidney disease need to be further investigated.

3.2. Oxidative Stress

The development of the embryo occurs in a relatively low-oxygen environment, and the developing fetus is highly vulnerable to oxidant injury due to its low antioxidant capacity [35]. Oxidative stress is an oxidative shift characterized by an imbalance between oxidants (e.g., reactive oxygen species (ROS) or reactive nitrogen species (RNS)) and antioxidants in favor of oxidants. A number of recent studies support the importance of oxidative stress in relation to programmed hypertension and kidney disease in different models, including pre-eclampsia, caloric restriction, maternal diabetes, prenatal dexamethasone exposure, high fructose intake, maternal smoking, and low-protein diet [6,36]. On the contrary, some reprogramming strategies have aimed at influencing the balance of NO–ROS to reduce oxidative stress and thus prevent hypertension and kidney disease of developmental origins [36]. H2S is a Janus-faced molecule that acts either as a pro-oxidant or antioxidant [37]. It can interact with ROS or RNS to generate free radicals. Conversely, H2S has an antioxidant property, by which it modulates the concentration of glutathione, an important intracellular thiolic antioxidant, and acts as a free radical scavenger [38]. Like NO, H2S causes vasodilatation and there is crosstalk between these two molecules to regulate BP [7,8]. Thus, these findings suggest that suppression of oxidative stress may contribute to antihypertensive effects of H2S. However, whether the antioxidative ability of H2S in itself is important in reducing the BP in concert with other BP-lowering actions remain to be clarified.

3.3. Nutrient-Sensing Signals

Imbalanced maternal nutrition and metabolic insults can disturb nutrient-sensing signals, which play a key role in fetal metabolism and development, resulting in renal programming and developmental hypertension [39,40]. A number of nutrient-sensing signaling pathways exist in the kidney, including cyclic adenosine monophosphate (AMP)-activated protein kinase (AMPK), silent information regulator transcript (SIRT), peroxisome proliferator-activated receptors (PPARs), and PPARγ coactivator-1α (PGC-1α) [41]. Early-life nutritional insults can drive nutrient-sensing signals (e.g., AMPK, SIRT1, and PGC-1α) to regulate PPARs and their target genes, thereby promoting programmed hypertension and kidney disease [42]. AMPK, SIRT1, and PGC-1α can also promote autophagy, a lysosome-mediated degradation process for damaged cellular constituents. Since dysregulation of autophagy causes abnormal mitochondrial function and increased oxidative stress [43], early interventions by AMPK activators or PPAR modulators have been examined as reprogramming strategies in DOHaD research [42,44]. It is noteworthy that one of the beneficial effects of H2S is the activation of AMPK and promotion of autophagy [45]. Further efforts are required to advance our understanding of the long-term programming effects of H2S on nutrient-sensing signals and their relationships to hypertension and developmental kidney disease.

3.4. Sodium Transporters

Fetal programming induced by early-life environmental insults that contribute to the development of hypertension is related to enhanced sodium reabsorption attributed to increased expression of sodium transporters [4]. These insults include prenatal glucocorticoid exposure [46,47], maternal low-protein diet [48], maternal high-fat diet [49], and maternal exposure to continuous light [50]. Several sodium transporters have been identified in these processes, including the Na-K-2Cl cotransporter (NKCC2), Na+/Cl− cotransporter (NCC), type 3 sodium hydrogen exchanger (NHE3), and the Na+/K+ATPase α1 subunit (NaKATPase). In addition to prenatal insults, our previous study has shown that a maternal high-fructose diet plus postnatal high-salt diet increased renal levels of NKCC2, NHE3, and NCC in a two-hit model of programmed hypertension [51]. Therefore, regardless of whether the insults are prenatal or postnatal, the dysregulation of sodium transporters resulting in inappropriate sodium reabsorption could increase the vulnerability to adult hypertension and kidney disease. Notably, an exogenous H2S donor (NaHS) has been reported to inhibit expression and/or activity of several sodium transporters, which may account for its protective effects on renal function and hypertension [52,53]. Nevertheless, there remains a lack of definitive data on how H2S affects sodium transporters from animal models of programmed hypertension and kidney disease. It will be of great value to reveal the reprogramming effect of H2S on sodium transporters in different models of programmed hypertension and kidney disease.

3.5. Epigenetic Regulation

Epigenetic regulation such as histone modifications, DNA methylation, and noncoding RNAs are involved in mediating the effects of early-life environmental influences on later-life health [54]. Epigenetics refers to alterations in gene expression that are not explained by changes in the DNA sequence. Until recently, little was known about the role of epigenetics in renal programming. A previous report has shown that maternal folic acid supplementation did not alter global DNA methylation in the offspring’s kidney [55]. Another study demonstrated that renal microRNA altered the protein restriction model of fetal programming [56]. Additionally, only a few studies using high-throughput DNA sequencing technologies report that different early-life insults permanently alter the renal transcriptome expression profile in rat offspring [40,57]. Conversely, emerging evidence support the idea that H2S has epigenetic effects by mediating DNA methylation [34], histone deacetylase (HDAC) [58], and microRNA expression [59]. These findings suggest that epigenetic regulation may be an important link between H2S signaling and renal programming.
All of these observations demonstrate a close link between H2S and other important mechanisms involved in renal programming (Figure 2). Despite emerging evidence indicating crosstalk between H2S and particular mechanisms underlying programmed processes, we are still far from the conclusion that H2S may play a central role in mediating other mechanisms leading to hypertension and developmental kidney disease.

4. Reprogramming Strategy Targeting the H2S Signaling Pathway

Although excess H2S may contribute to some diseases, the application of H2S treatment modalities to increase H2S signaling attract the most attention [60]. As mentioned earlier, the protective effects of H2S signaling have been demonstrated in many disorders, including hypertension and kidney disease. Therefore, the H2S treatments presented here focus on approaches aimed to increase H2S signaling. Currently, available H2S treatment modalities include precursors for H2S synthesis, H2S donors, and natural plant-derived compounds. l-cysteine, N-acetylcysteine (NAC), and D-cysteine are precursors for endogenous H2S synthesis. H2S donors, including donor molecules and H2S-releasing drugs, can be divided into three types: inorganic sulfide salts (e.g., NaHS), organic compounds (e.g., GYY4137), and agonists of H2S-synthesized enzymes [60,61]. Additionally, garlic-derived polysulfides are considered to be an H2S treatment modality as they can stimulate the production of H2S [61].
Here, we summarize studies which document reprogramming in animal models of hypertension and kidney disease, focusing on interventions aimed at the H2S signaling pathway. Of note, pharmacotherapies will be narrowly restricted to key periods during early development. These H2S treatment modalities are listed in Table 1 [62,63,64,65,66,67,68]. This list is by no means complete and is expected to grow rapidly as the field of DOHaD research flourishes.

4.1. Precursors for H2S Synthesis

l-cysteine supplementation is widely used to create endogenous H2S in experimental studies. l-cysteine has been known to lower BP directly or through its storage form, glutathione, by decreasing oxidative stress, improving insulin resistance and glucose metabolism, and modulating NO [68]. N-acetylcysteine (NAC), a stable cysteine analogue, has been reported to prevent hypertension in experimental and human studies [68,69], which supports this idea. However, l-cysteine is not a good H2S precursor due to its multiple metabolic fates. Indeed, the reported antihypertensive and renoprotective effects may not be directly related to H2S signaling. Another H2S precursor, d-cysteine, is nutritionally antagonistic [70]; therefore, the antihypertensive effect of d-cysteine supplementation has received less attention. There is only one report demonstrating that d-cysteine supplementation protects the mouse kidney against ischemia/reperfusion injury [71].
So far, very few studies have addressed DOHaD research to explore the protective role of H2S precursors in the kidney in response to a variety of early-life insults. We first showed that early supplementation of d- or l-cysteine between 4 and 6 weeks of age (i.e., prehypertensive stage) can protect SHRs against high-salt-enhanced elevation of BP and kidney injury [62]. Although a previous report has shown that the d-cysteine pathway is 80-fold greater in H2S-producing activity in the kidney compared to the l-cysteine pathway [71], our data revealed that the protective effects on BP are similar. Correspondingly, early supplementation of NAC starting at four weeks of age has been reported to prevent hypertension in SHRs [63]. As such, the reprogramming effects of early NAC therapy on the protection of programmed hypertension have been reported in several animal models, including prenatal dexamethasone and postnatal high-fat diet [64], suramin-induced pre-eclampsia [65], NG-nitro-l-arginine-methyl-ester (L-NAME)-induced pre-eclampsia [66], and maternal nicotine exposure [67]. Despite the reprogramming effects of several H2S precursors in response to early-life insults that have been studied in experimental animal models, there remains a lack of data regarding their clinical translation.

4.2. H2S Donors

In most studies, inorganic sulfide salts such as sodium hydrosulfide (NaHS) and sodium sulfide (Na2S) are used as H2S donors to generate exogenous H2S [60]. NaHS has been reported to be protective in various hypertensive models, including SHR [72], Ang II-infused mice [31], NO-deficient rats [14], and Dahl salt-sensitive rats [15]. Additionally, the protective effects of exogenous H2S derived from inorganic sulfide salts in different experimental models of kidney disease have been reviewed elsewhere [21,22]. However, inorganic sulfide salts induce a rapid but short-lived increase of H2S to supraphysiological concentrations [73]. To overcome this limitation, several organic slow-releasing H2S compounds have been synthesized [74]. Among them, GYY4137 showed a BP-lowering effect in both CSE inhibition-induced pre-eclampsia and L-NAME-treated SHR [75,76]. Additionally, GYY4137 caused both antihypertensive and renoprotective effects in an Ang II-induced hypertensive model [59]. In addition to slow-releasing H2S compounds, hybrids of H2S and other drugs are receiving attention. Although H2S-releasing hybrids such as SG1002 (H2S-NO hybrid) and ATB-346 (H2S-NSAID hybrid) are now being demonstrated in clinical trials, there remains a need to better understand the underlying mechanisms for the treatment of a wide range of disorders, especially hypertension and kidney disease [77].
In contrast to the multitude of studies in adults, there are very few DOHaD studies on the role of H2S donors in hypertension and developmental kidney disease. NaHS therapy between four and six weeks of age has been reported to prevent hypertension in adult SHRs [33]. Another report showed that renovascular hypertensive mother rats treated with NaHS can protect their offspring against hypertension [34]. However, none of the organic slow-releasing H2S compounds and H2S-releasing hybrids have been examined in terms of their beneficial effects on programmed hypertension and kidney disease.

4.3. Natural Plant-Derived Compounds

Garlic-derived polysulfide compounds have drawn attention as natural precursors of H2S. A growing body of reports have shown that garlic-derived polysulfide compounds have the potential for ameliorating hypertension and associated morbidity [78,79]. Polysulfides in garlic may also influence the regulation of the NO signaling pathway, leading to NO-mediated vasodilation and reduction of BP [79]. Also, garlic-derived compounds provide renoprotection in several models of kidney disease, such as renal ischemia/reperfusion injury [80], acetaminophen-induced nephrotoxicity [81], and gentamicin-induced nephrotoxicity [82]. However, the reprogramming effects of these compounds on hypertension and kidney disease of developmental origins have not yet been examined.

4.4. Others

A number of currently used drugs have been reported to increase H2S concentrations, such as ramipril, atorvastatin, amlodipine, vitamin D, digoxin, aspirin, paracetamol, carvediol, testosterone, 17β-estradiol, and metformin [60]. Despite progress made in recent years on pharmacotherapies in the H2S field, very few studies have targeted their potential in reprogramming. With a better understanding on the interplay between the H2S signaling pathway and other mechanisms underlying renal programming, the application of reprogramming strategies targeting the abovementioned mechanisms is feasible for early intervention.
For example, there is a growing body of evidence that AMPK activators possess therapeutic potential in treating hypertension and kidney disease [83,84]. Since AMPK is part of the nutrient-sensing signaling involved in renal programming, and AMPK is an important H2S downstream signal [45], it would be interesting to see whether AMPK activators may be a useful reprogramming strategy to prevent developmental programming of hypertension and kidney disease. Given the fact that most available H2S-releasing drugs are still in preclinical experiments, targeting the H2S downstream signal-related mechanisms would appear to be a practical approach for further clinical translation.

5. Conclusions

Advances in experimental research indicate that the H2S signaling pathway may provide potential therapeutic targets for treating hypertension and kidney disease. Targeting the H2S signaling pathway as a reprogramming strategy against hypertension and developmental kidney disease is a flourishing field and will become even more important in light of the growing epidemic of hypertension and kidney disease.
This review has provided an overview on the various reprogramming strategies that are relevant to the H2S signaling pathway, including precursors for H2S synthesis, H2S donors, and natural plant-derived compounds. Also, reprogramming interventions may be achieved by targeting the H2S downstream signal, which mediates particular mechanisms of renal programming. Although emerging evidence from animal studies supports H2S as a reprogramming strategy for long-term protection against hypertension and developmental kidney disease, these results await further clinical translation.

Author Contributions

C.-N.H. contributed to concept generation, data interpretation, drafting of the manuscript, critical revision of the manuscript, and approval of the article; Y.-L.T. contributed to concept generation, data interpretation, critical revision of the manuscript, and approval of the article.

Funding:

This work was supported by the Grants CMRPG8F0251, CMRPG8G0671, and CMRPG8D0271 from Chang Gung Memorial Hospital, Kaohsiung, Taiwan.

Conflicts of Interest

The authors declare no conflict of interest.

Abbreviations

ACEAngiotensin-converting enzyme
AMPKCyclic adenosine monophosphate (AMP)-activated protein kinase
AT1RAngiotensin II type 1 receptor
CATCysteine aminotransferase
CBSCystathionine β-synthase
CSECystathionine γ-lyase
DAOD-amino acid oxidase
DOHaDDevelopmental origins of health and disease
L-NAMENG-nitro-l-arginine-methyl-ester
NACN-acetylcysteine
NaHSSodium hydrosulfide
NCCNa+/Cl− cotransporter
NHE3Type 3 sodium hydrogen exchanger
NKCC2Na-K-2Cl cotransporter
PGC-1αPeroxisome proliferator-activated receptor γ coactivator-1α
PPARPeroxisome proliferator-activated receptor
RASRenin–angiotensin system
SHRSpontaneously hypertensive rat
SIRTSilent information regulator transcript
3MST3-mercaptopyruvate sulphurtransferase

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Ijms 19 01438 g001 550
Figure 1. Schematic representation of enzymatic and nonenzymatic H2S synthesis pathways. Cystathionine β-synthase (CBS) catalyzes homocysteine and serine to produce H2S and l-cystathionine. Cystathionine γ-lyase (CSE) catalyzes l-cysteine to generate H2S, pyruvate, and ammonia. 3-Mercaptopyruvate sulfurtransferase (3MST) produces H2S from 3-mercaptopyruvate (3MP), which is generated by cysteine aminotransferase (CAT) and d-amino acid oxidase (DAO) from l-cysteine and d-cysteine, respectively. In addition to enzymatic synthesis pathways, endogenous production of H2S can also occur through other nonenzymatic processes.
Figure 1. Schematic representation of enzymatic and nonenzymatic H2S synthesis pathways. Cystathionine β-synthase (CBS) catalyzes homocysteine and serine to produce H2S and l-cystathionine. Cystathionine γ-lyase (CSE) catalyzes l-cysteine to generate H2S, pyruvate, and ammonia. 3-Mercaptopyruvate sulfurtransferase (3MST) produces H2S from 3-mercaptopyruvate (3MP), which is generated by cysteine aminotransferase (CAT) and d-amino acid oxidase (DAO) from l-cysteine and d-cysteine, respectively. In addition to enzymatic synthesis pathways, endogenous production of H2S can also occur through other nonenzymatic processes.
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Figure 2. Schema outlining the potential role of H2S on mediating other mechanisms in the kidney leading to hypertension and developmental kidney disease in response to a variety of early-life insults. Targeting the H2S pathway could be a reprogramming strategy for programmed hypertension and kidney disease to reduce the lifetime burden by early intervention.
Figure 2. Schema outlining the potential role of H2S on mediating other mechanisms in the kidney leading to hypertension and developmental kidney disease in response to a variety of early-life insults. Targeting the H2S pathway could be a reprogramming strategy for programmed hypertension and kidney disease to reduce the lifetime burden by early intervention.
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Table
Table 1. Reprogramming strategy targeted on H2S signaling in models of programmed hypertension and kidney disease.
Table 1. Reprogramming strategy targeted on H2S signaling in models of programmed hypertension and kidney disease.
Animal ModelsGender/SpeciesAge at EvaluationDose and Period of TreatmentReprogramming EffectsRef.
Precursors for endogenous H2S synthesis
High-salt SHR1Male SHR12 weeksl-cysteine (8 mmol kg−1 body weight/day) from 4 to 6 weeks of agePrevented hypertension; prevented renal injury[62]
High-salt SHRMale SHR12 weeksd-cysteine (8 mmol kg−1 body weight/day) from 4 to 6 weeks of agePrevented hypertension; prevented renal injury[62]
SHRMale SHR12 weeks2% NAC2 in drinking water from 4 to 12 weeks of agePrevented hypertension[63]
Prenatal dexamethasone and postnatal high-fat dietMale SD3 rats12 weeks1% NAC in drinking water during pregnancy and lactationPrevented hypertension[64]
Suramin-induced pre-eclampsiaMale SD rats12 weeks1% NAC in drinking water during pregnancy and lactationPrevented hypertension[65]
NG-nitro-l-arginine-methyl ester (l-NAME)-induced pre-eclampsiaMale SD rats12 weeks1% NAC in drinking water during pregnancy and lactationPrevented hypertension[66]
Maternal nicotine exposureMale SD rats8 monthsNAC (500 mg/kg/day) in drinking water from gestational day 4 to postnatal day 10Prevented hypertension[67]
H2S donors
SHRMale SHR12 weeksNaHS (14 μmol/kg/day) daily intraperitoneal injection from 4 to 8 weeks of agePrevented hypertension[33]
1 SHR = spontaneously hypertensive rat; 2 NAC = N-acetylcysteine; 3 SD rats = Sprague–Dawley rats.

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Hsu, C.-N.; Tain, Y.-L. Hydrogen Sulfide in Hypertension and Kidney Disease of Developmental Origins. Int. J. Mol. Sci. 2018, 19, 1438. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms19051438

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Hsu C-N, Tain Y-L. Hydrogen Sulfide in Hypertension and Kidney Disease of Developmental Origins. International Journal of Molecular Sciences. 2018; 19(5):1438. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms19051438

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Hsu, Chien-Ning, and You-Lin Tain. 2018. "Hydrogen Sulfide in Hypertension and Kidney Disease of Developmental Origins" International Journal of Molecular Sciences 19, no. 5: 1438. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms19051438

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