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Review

Targeting Heme Oxygenase-1 in Cardiovascular and Kidney Disease

by
Heather A. Drummond
1,
Zachary L. Mitchell
1,
Nader G. Abraham
2,3 and
David E. Stec
1,*
1
Department of Physiology and Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MI 39216, USA
2
Departments of Medicine and Pharmacology, New York Medical College, Vahalla, NY 10595, USA
3
Joan C. Edwards School of Medicine, Marshall University, Huntington, VA 25701, USA
*
Author to whom correspondence should be addressed.
Antioxidants 2019, 8(6), 181; https://doi.org/10.3390/antiox8060181
Submission received: 3 June 2019 / Revised: 13 June 2019 / Accepted: 15 June 2019 / Published: 18 June 2019
(This article belongs to the Special Issue Heme Oxygenase-A Balancing Act Between Cytoprotective and Pathophysiological Cascades)
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Abstract

:
Heme oxygenase (HO) plays an important role in the cardiovascular system. It is involved in many physiological and pathophysiological processes in all organs of the cardiovascular system. From the regulation of blood pressure and blood flow to the adaptive response to end-organ injury, HO plays a critical role in the ability of the cardiovascular system to respond and adapt to changes in homeostasis. There have been great advances in our understanding of the role of HO in the regulation of blood pressure and target organ injury in the last decade. Results from these studies demonstrate that targeting of the HO system could provide novel therapeutic opportunities for the treatment of several cardiovascular and renal diseases. The goal of this review is to highlight the important role of HO in the regulation of cardiovascular and renal function and protection from disease and to highlight areas in which targeting of the HO system needs to be translated to help benefit patient populations.

1. Introduction

Heme oxygenase (HO) is the rate-limiting enzyme in the breakdown of heme in the body. Two major isoforms of HO exist: heme oxygenase-1 (HO-1) and heme oxygenase-2 (HO-2). Both isoforms of HO are expressed in all tissues of the body. HO-1 is the inducible isoform whose expression is regulated by a wide variety of physiologic and pathophysiologic stimuli [1]. Heme oxygenase-2 is the constitutive isoform of HO found in all tissues and cells of the body [2]. Bilirubin, an endogenous antioxidant derived from HO catabolism of heme is capable of directly scavenging reactive oxygen species (ROS) and inhibiting oxidative stress [3,4,5,6,7]. Carbon monoxide (CO), the other product derived from HO catabolism of heme, is a gaseous transmitter which can affect ion channels, nitric oxide release, as well as mitochondrial proteins [8,9]. An underappreciated aspect of HO breakdown of heme is the release of free iron and its subsequent sequestration by induction of ferritin. Labile iron is toxic due to its ability to release ROS which can then result in cellular damage especially in renal tubule cells [10]. Ferritin is a cytoprotective protein that is also involved in the regulation of myelopoiesis and inflammation [11]. HO-1 induction mediates many beneficial effects in the cardiovascular system and kidney as well as in metabolism [12,13,14]. For this review, we will focus on the role of HO in the cardiovascular system and the potential for targeting this system for the treatment of cardiovascular and end-organ damage.

2. HO and the Cardiovascular System

2.1. Role of Heme Oxygenase in the Regulation of Blood Pressure

The anti-hypertensive actions of HO-1 induction was first demonstrated in the spontaneously hypertensive rat (SHR) treated with the HO-1 inducers, stannous chloride (SnCl2) and hemin [15,16,17,18]. Later studies using genetic overexpression of HO-1 demonstrated similar anti-hypertensive effects in this model [19,20]. HO-1 induction has also been demonstrated to have anti-hypertensive effects in other models of hypertension such as angiotensin-II (Ang II)-dependent hypertension, deoxycorticosterone acetate (DOCA)-salt hypertension, and renovascular hypertension [21,22,23,24]. Likewise, deficiency in HO-1 exacerbates the blood pressure response to Ang II-dependent hypertension and DOCA-salt hypertension [25,26].
While global induction of HO-1 had been repeatedly demonstrated to lower blood pressure in several different models of hypertension, the role of the kidney in this response was not known. However, studies in which HO-1 was induced specifically in the kidney with the known inducer cobalt-protoporphyrin (CoPP) or genetically, via kidney-specific overexpression of HO-1, have demonstrated the anti-hypertensive effects of HO-1 in the kidney [27,28]. One mechanism by which kidney-specific induction of HO-1 lowers blood pressure in Ang II-dependent hypertension is by decreasing reactive oxygen species (ROS) generation (Figure 1) [27,29,30]. Further studies in cultured renal tubule cells have also demonstrated the antioxidant actions of HO-1 overexpression against enhanced Ang II-mediated ROS production [31,32]. Additional studies found that increases in renal perfusion pressure upregulate HO-1 levels and that renal medullary inhibition of HO-1 results in the development of salt-sensitive hypertension [33].
The role of heme oxygenase-2 (HO-2) in the regulation of blood pressure has not been studied to the extent of HO-1. Mice deficient for HO-2 do not exhibit enhanced blood pressure response to Ang II-dependent or N(ω)-nitro-L-arginine methyl ester (L-NAME)-dependent hypertension; however, HO-2 knockout mice do exhibit a sex difference in response to renovascular hypertension with male knockout mice exhibiting an exaggerated blood pressure response as compared to wild-type mice and female knockout mice lacking any difference to wild-type mice [34,35].
Heme oxygenase can also be induced by natural products such as curcumin, flavonoids, isothiocyanates and organosulfur compounds such as diallyl sulfide (DAS) and its other derivatives [36]. Curcumin lowers blood pressure in many models of experimental hypertension including Ang II-dependent hypertension through alterations in angiotensin receptor 1 (AT1R) levels [37]. Curcumin also improves blood pressure through its effects on vascular function as well as its anti-inflammatory actions [38,39]. Regular consumption of flavonoids exerts beneficial cardiovascular effects and may reduce the onset or progression of hypertension; however, the mechanism by which this occurs is not fully understood although the anti-inflammatory actions of flavonoids may contribute to this beneficial effect [40,41]. While it is clear that natural HO inducing compounds can have protective antihypertensive and cardiovascular effects, the specific role of HO-1 induction in these effects has yet to be determined.
Overall, induction of HO-1 results in lowering of blood pressure in several different models of experimental and genetic hypertension. One mechanism by which induction of HO-1 lowers blood pressure is through decreasing ROS production which is common in many forms of experimental hypertension [42,43]. The therapeutic potential of HO induction has been clearly shown in several models of experiments hypertension. One of the most impressive studies demonstrated that induction of HO-1 with a hemin pump resulted in a sustained reduction in blood pressure long after initial hemin treatment [44]. This study suggests that short-term induction of HO-1 may chronically lower blood pressure which could be a novel therapeutic approach to circumvent patient compliance issues faced when taking daily anti-hypertensive medications. One limitation of the preclinical studies to date is lack of experimental evidence for the anti-hypertensive actions of HO-1 induction in large animal models of hypertension. This limitation needs to be addressed so that these encouraging results can be directly translated to hypertensive patients.

2.2. Role of Heme Oxygenase in the Regulation of Renal Function

Renal vascular and tubular function are both regulated by the expression of HO-1 and HO-2 since both of these isoforms are found throughout the kidney [45,46]. In the renal vasculature, HO-2 protects against excessive renal vasoconstriction through the generation of CO [47,48,49,50,51]. However, CO can also elicit renal vasoconstriction through increased reactive oxygen species (ROS) production in renal arterioles [52]. CO can also affect renal vascular tone through its complex interaction with nitric oxide (NO). Inhibition of NO production increases renal vascular CO production and inhibition of NO enhances renal vasoconstriction following HO inhibition [53,54]. However, vascular smooth muscle-specific overexpression of HO-1 results in an attenuation of NO-mediated vasorelaxation and hypertension suggesting that large increases in HO-mediated CO production can alter NO responsiveness [55]. These studies highlight the complex relationship between vascular CO and NO production. The other HO metabolite, bilirubin, has also been shown to have effects on renal vascular function. Mice made moderately hyperbilirubinemic via antagonism of hepatic UDP-glucuronosyltransferase 1-1 (UGT1A1) are resistant to Ang II-induced hypertension and decreases in renal blood flow and glomerular filtration rate (GFR) [56,57]. One mechanism by which bilirubin protects against Ang II-induced vasoconstriction is through the preservation of NO bioavailability [58,59]. Bilirubin preserves NO bioavailability due to its antioxidant actions which likely prevents the reaction of NO with superoxide anion and reduces subsequent peroxynitrite formation [60,61,62].
Arterial pressure regulates renal tubular function through the renal pressure-natriuretic response [63,64]. Renal perfusion pressure can directly alter HO activity in the renal medulla, and blockade of renal medullary HO activity significantly attenuates renal pressure natriuresis and results in salt-sensitive hypertension [33]. Renal tubular induction of HO-1 was found to increase sodium and water excretion as well as increase GFR [65,66]. However, the mechanism by which this occurs and the metabolites responsible for mediating these changes are not fully understood. Previous studies in both cultured thick ascending loop of Henle (TALH) cells and in transgenic mice specifically overexpressing HO-1 in the TALH have demonstrated that HO-1 can protect against Ang II-mediated increases in ROS production, decrease the levels of the sodium-potassium 2 chloride (NKCC2) transporter, and attenuate the development of Ang II-dependent hypertension [28,31]. HO induction stimulates the apical 70-pS K+ channel in the TALH through the generation of CO but not biliverdin/bilirubin [67]. Additional studies have suggested that HO derived CO is involved in the regulation of the epithelial sodium channel under conditions of hypoxia, but the physiological significance of this regulatory pathway is not clear [68].

3. HO and Target Organ Injury

3.1. HO and the Heart

HO has been shown to play a protective role in the heart in many different pathological conditions. HO-1 induction or overexpression has been demonstrated to protect against myocyte hypertrophy both in vitro and in vivo [24,69]. However, the role of HO induction in Ang II-dependent cardiac hypertrophy has been controversial with studies demonstrating both protection and lack of protection against Ang II-dependent cardiac hypertrophy [70,71]. While the role of HO induction in preventing Ang II-dependent hypertrophy is controversial, both bilirubin and CO administered alone protect against Ang II-dependent cardiac hypertrophy [70,72].
Alterations in the HO system have shown the most promise in the protection of the heart against ischemia–reperfusion (IR) injury. Cardiac IR injury results in the upregulation of HO-1 and lack of this upregulation has been shown to contribute to ventricular fibrillation (VF) in diabetic animals [73,74]. Gene-targeted mice lacking HO-1 are more susceptible to cardiac IR injury, and transgenic overexpression of HO-1 in the heart protects against IR injury [75,76]. One mechanism by which HO protects against cardiac IR injury is through reductions in post-ischemia ROS production (Figure 1) [75]. The decrease in post-ischemic ROS production by HO induction likely occurs through increased bilirubin production. Several studies have demonstrated bilirubin itself protects the heart from IR injury [77,78,79]. A potential therapeutic strategy utilizing HO-1 induction to protect against IR injury is the design of “smart” gene therapy vectors in which expression of HO-1 is regulated in a hypoxia-specific fashion [80,81]. In this system, HO-1 expression is regulated by hypoxia-specific transcription factors which allow high levels of HO-1 expression during the ischemic period but “turn-off” HO-1 expression once the hypoxic signal has ended [80,81]. CO, administered via carbon-monoxide releasing molecules (CORMs) or inhaled, has been shown to protect the heart against IR injury [82,83,84,85]. CO acts through several different mechanisms including mitochondrial potassium channels, activation of the p38 mitogen-activated protein kinase (p38MAPK) pathway, and activation of endothelial nitric oxide synthase (eNOS)/cGMP pathway (Figure 1) [82,83].
While there is an abundance of experimental evidence from rodent models, the translation of the protective effect of HO induction has not been significantly explored in large animal preclinical models as well as in human patients. In swine, a model of HO-1 overexpression exists; however, the protective actions of HO-1 in the heart of this model have not been studied [86]. Human HO-1 overexpression driven by a recombinant adenoassociated virus (rAAV) is effective in attenuating post-ischemic inflammation and preserving cardiac function in a swine model [87]. In humans, a (GT)n dinucleotide length polymorphism in the promoter of the HO-1 gene regulates its inducibility. Short (class S) repeats are associated with greater up-regulation of HO-1 than are long repeats. Class S repeats are protective against the incidence of ischemic coronary heart disease and cardiac allograft vasculopathy in several populations [88,89,90]. It is clear that more studies are needed in large animal preclinical models as well as in human patient populations to fully translate the wealth of data that has emerged on the protective actions of HO-1 induction in small animal models.

3.2. HO and the Kidney

HO-1 is expressed at low levels in the kidney under basal conditions. However, it can be induced in several clinically relevant renal disease states, including hypertension, several forms of acute renal injury, and transplant rejection. The protective role for HO-1 in models of acute kidney injury has been elucidated using chemical inducers and inhibitors of HO-1 with results of these studies further corroborated in HO-1 knockout or renal cell-type specific HO-1 overexpression. Human HO-1 deficiency mirrors the renal injury reported in the HO-1 knockout mouse including renal iron deposition, increased renal oxidative stress and the development of nephritis, further demonstrating the important protective role of this system in the kidney [91,92].
Renal IR injury occurs after blood flow to the kidney is reduced for an extended period. It can lead to progressive loss of renal function following the reestablishment of blood flow due to injury to specific cell types which require a constant source of oxygen for their long-term survival. Induction of HO-1 with hemin or tin-chloride protects against renal IR injury [93,94]. HO-1 induction also protects against other forms of acute kidney injury brought on by nephrotoxins such as glycerol and cisplatin [95,96,97,98]. Additional studies have demonstrated that deletion HO-1 specifically in the proximal tubule of the kidney worsens cisplatin-induced acute kidney injury through regulation of cleaved caspase-3 and modulation of p38 signaling while overexpression of HO-1 in the proximal tubule protects against cisplatin-induced acute renal injury by decreasing the levels of cleaved caspase-3 [99]. Another mechanism by which HO-1 protects the kidney is through regulation of autophagy (Figure 1). Autophagy is a complex process which can constitute a stress adaptation that avoids cell death (and suppresses apoptosis), whereas, in other cellular settings, it constitutes an alternative cell-death pathway. Renal tubule cells lacking HO-1 exhibit higher levels of basal autophagy, impaired progression of autophagy, and increased apoptosis after cisplatin treatment which is reversed upon restoration of HO-1 expression [100].
In humans, patients with the long (GT)n dinucleotide length polymorphism in the promoter of the HO-1 gene (decreased expression), have 1.58 fold higher odds of acute kidney injury (AKI) following cardiac surgery as compared to individuals with the short repeat polymorphism [101]. In human AKI patients, plasma and urinary HO-1 levels correlate with renal HO-1 expression and degree of renal injury indicating that levels of HO-1 could be a viable biomarker for AKI [102]. However, the source, as well as the function of plasma HO-1 in the setting of AKI, is not known. For example, is HO-1 found in the plasma enzymatically active? If so, what is its substrate? If not, what is its function? These questions need to be addressed in order to determine the role of circulating HO-1 in AKI.
Not only has the protective actions of HO-1 induction been studied in the setting of AKI, the specific role of its major metabolites, bilirubin, and CO have also been investigated. Bilirubin treatment has had mixed effects in rat models of renal IR-injury with several studies demonstrating complete protection and one study demonstrating partial protection [93,103,104]. However, several studies in both human patient populations and in the hyperbilirubinemic Gunn rat demonstrate protection against the development of diabetic kidney injury [60,105]. Human studies have focused on the correlation of serum bilirubin levels with the development of acute renal injury. Bilirubin treatment has not yet been tried as a therapy against acute kidney injury in humans. Bilirubin has traditionally been thought to protect the kidney through its anti-oxidant and anti-inflammatory properties; however, new studies have identified bilirubin as an activator of nuclear hormone receptors [7,106]. This signaling property of bilirubin raises the possibility that, in addition to its potent anti-oxidant actions, bilirubin may afford renoprotection through alterations in metabolism which may help renal tubule cells recover after injury.
Carbon monoxide has also been demonstrated to protect the kidney against acute injury as well as increase renal allograft survival and viability following transplantation [107,108]. CO donor drugs have been demonstrated to reduce renal injury following ischemia as well as nephrotoxin exposure [109,110,111]. CO inhalation therapy has also been effective in protecting the kidney against IR injury as well as playing a beneficial role in renal allograft survival [108,112,113,114]. CO exerts its protective effects through alterations in several signaling mechanisms including: (1) vascular endothelial growth factor (VEGF) production; (2) the inflammatory response through regulation of high-mobility group box 1 (HMGB1) proteins; (3) through the endoplasmatic reticulum (ER) stress response; (4) through metabolic hormones such as fibroblast growth factor-21 (FGF21); and (5) increased expression of the circadian rhythm protein Period 2 (Per2) [115,116,117,118,119]. CO inhalation has also proven to be a successful therapy in protecting the kidney against IR injury in swine models, which are highly translational to humans [107,114,120].

4. Conclusions

The heme oxygenase system provides many opportunities for protection against cardiovascular and renal disease (Figure 1). Several strategies to induce HO-1 apart from the traditional porphyrin-based compounds and heme have been reported. These include targeting of the nuclear factor (erythroid-derived 2)-like 2 (NFE2L2 and Nrf2, respectively) [121,122,123], and treatment with resveratrol and electroacupuncture [124,125]. One area in which research into the protective actions of HO induction is lacking is in large animal models of cardiovascular and renal disease. This is especially true for studies examining the anti-hypertensive actions of HO-1 induction. One potential reason for this has been the lack of adequate experimental drugs to allow for induction or inhibition of HO in larger animals. The development of novel HO inducers described above, as well as novel non-porphyrin based HO inhibitors, will help in this area [126,127,128]. With the rapid development of CRISPR/Cas9 technology, it is now possible to alter HO-1 levels in larger preclinical animal models which will further advance the therapeutic potential of the HO system for the treatment of cardiovascular and renal disease.

Author Contributions

H.A.D. and D.E.S. wrote the manuscript and designed the figures. Z.L.M. and N.G.A. edited the manuscript. All authors approved final submitted version of the manuscript.

Funding

The authors would like to acknowledge funding from grants P20GM104357-02 and P20GM121334 from the National Institute of General Medical Sciences and grant PO1HL-051971 from National Heart, Blood and Lung Institute. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Conflicts of Interest

The authors declare no conflict of interest.

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Antioxidants 08 00181 g001 550
Figure 1. Proposed mechanisms by which HO and its metabolites confer cardio-renal protection.
Figure 1. Proposed mechanisms by which HO and its metabolites confer cardio-renal protection.
Antioxidants 08 00181 g001

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Drummond, H.A.; Mitchell, Z.L.; Abraham, N.G.; Stec, D.E. Targeting Heme Oxygenase-1 in Cardiovascular and Kidney Disease. Antioxidants 2019, 8, 181. https://doi.org/10.3390/antiox8060181

AMA Style

Drummond HA, Mitchell ZL, Abraham NG, Stec DE. Targeting Heme Oxygenase-1 in Cardiovascular and Kidney Disease. Antioxidants. 2019; 8(6):181. https://doi.org/10.3390/antiox8060181

Chicago/Turabian Style

Drummond, Heather A., Zachary L. Mitchell, Nader G. Abraham, and David E. Stec. 2019. "Targeting Heme Oxygenase-1 in Cardiovascular and Kidney Disease" Antioxidants 8, no. 6: 181. https://doi.org/10.3390/antiox8060181

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