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Brosolo, G.; Da Porto, A.; Marcante, S.; Picci, A.; Capilupi, F.; Capilupi, P.; Bertin, N.; Vivarelli, C.; Bulfone, L.; Vacca, A.; et al. Omega-3 Fatty Acids in Arterial Hypertension. Encyclopedia. Available online: https://encyclopedia.pub/entry/48130 (accessed on 17 June 2024).
Brosolo G, Da Porto A, Marcante S, Picci A, Capilupi F, Capilupi P, et al. Omega-3 Fatty Acids in Arterial Hypertension. Encyclopedia. Available at: https://encyclopedia.pub/entry/48130. Accessed June 17, 2024.
Brosolo, Gabriele, Andrea Da Porto, Stefano Marcante, Alessandro Picci, Filippo Capilupi, Patrizio Capilupi, Nicole Bertin, Cinzia Vivarelli, Luca Bulfone, Antonio Vacca, et al. "Omega-3 Fatty Acids in Arterial Hypertension" Encyclopedia, https://encyclopedia.pub/entry/48130 (accessed June 17, 2024).
Brosolo, G., Da Porto, A., Marcante, S., Picci, A., Capilupi, F., Capilupi, P., Bertin, N., Vivarelli, C., Bulfone, L., Vacca, A., Catena, C., & Sechi, L.A. (2023, August 16). Omega-3 Fatty Acids in Arterial Hypertension. In Encyclopedia. https://encyclopedia.pub/entry/48130
Brosolo, Gabriele, et al. "Omega-3 Fatty Acids in Arterial Hypertension." Encyclopedia. Web. 16 August, 2023.
Omega-3 Fatty Acids in Arterial Hypertension
Edit

Omega-3 polyunsaturated fatty acids (ω-3 PUFAs), including alpha-linolenic acid (ALA) and its derivatives eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are “essential” fatty acids mainly obtained from diet sources comprising plant oils, marine blue fish, and commercially available fish oil supplements.

omega-3 polyunsaturated fatty acids (ω-3 PUFAs) hypertension linoleic acid (LA) alpha-linoleic acid (ALA) eicosapentaenoic acid (EPA)

1. Introduction

Arterial hypertension is the most frequent chronic disease worldwide [1][2], with a prevalence that reaches 35% of the adult population accounting for 9.4 million yearly deaths [3]. Hypertension is a major modifiable cardiovascular risk factor, increasing the risk of cardiovascular death and morbidity related to chronic invalidating disorders, including coronary, cerebrovascular, and peripheral vascular disease, heart failure, and chronic kidney disease [4]. Primary hypertension is a complex pathophysiological condition that is characterized at the peripheral vascular level by an imbalance between vasoconstriction and vasodilatation [5]. This imbalance arises from an intricate interplay of genetic and environmental factors that include lifestyle and dietary habits [6]. In this regard and due to their proven ability to reduce blood pressure (BP), lifestyle changes are highly recommended in all patients as the first step to treat hypertension [1][2]. Among lifestyle recommendations, dietary interventions play an essential role to the extent that caloric restriction contributes to weight loss and supplementation with specific food components affects BP regulation.
In the last three decades, omega-3 polyunsaturated fatty acids (ω-3 PUFAs) have gained great interest within the research community, since seminal studies [7][8][9][10] reported a surprisingly low incidence of cardiovascular disease in populations, such as Eskimos and Alaskan Natives, traditionally eating high amounts of ω-3 PUFA-rich fatty fish. Later, epidemiological, observational, interventional studies, comprehensive reviews, and meta-analyses were performed with the aim to define the true potential of ω-3 PUFAs for cardiovascular prevention. Moreover, in vitro and in vivo animal and human studies have paved the way for a better understanding of the cellular and molecular mechanisms of ω-3 PUFA-mediated vascular protection. These studies have clearly demonstrated that ω-3 PUFAs possess antioxidant, anti-inflammatory, antithrombotic, and endothelium protective properties [11]. In addition, dietary supplementation with high doses of ω-3 PUFAs modifies plasma lipids concentrations decreasing serum triglyceride and increasing HDL-cholesterol levels [12][13][14][15]. Evidence suggests that triglyceride-rich lipoproteins contribute to the “residual lipoprotein attributable risk” that was reported in high-risk patients treated with high-dose statins, despite reaching very low LDL-cholesterol levels [16][17][18][19]. Despite inconsistent results of early randomized controlled trials with triglyceride-lowering drugs, subgroup analyses of more recent studies [20][21][22] and the results of the REDUCE-IT (Reduction of Cardiovascular Events with Icosapent Ethyl Intervention Trial) [23] showed a significant cardiovascular benefit of triglyceride-lowering, thus expanding the potential role of ω-3 PUFAs for clinical practice. As a result, national and international guidelines for cardiovascular prevention currently recommend regular consumption of ω-3 PUFAs as part of a healthy diet [24][25][26][27]. Moreover, ω-3 PUFA-deficient diets have been classified as the sixth most relevant dietary risk factor, accounting for 1.5 million deaths and 33 million disability-adjusted life years worldwide [28].

2. Biochemistry and Cellular Mechanisms of Polyunsaturated Fatty Acids (PUFAs)

2.1. General Biochemistry and Biologic Sources of PUFAs

The nomenclature of PUFAs is based on the number of carbons in the molecule (C) and the position of the first double bond relative to the terminal methyl carbon. Omega (ω) indicates the last methyl carbon as opposed to the carboxyl group of the acyl chain, and -6 or -3 indicates the position of the first double bond from the last methyl group [29]. PUFAs are categorized into essential and nonessential according to the ability of the human body to synthesize them de novo. Nonessential PUFAs are those of the ω-7 and ω-9 families since they can be synthesized directly from endogenous saturated fatty acids. Essential PUFAs include the ω-6 and ω-3 families, which cannot be synthesized de novo because mammals lack enzymes to build up double bonds in the fatty acid chain and must necessarily be obtained from the diet. The two parents essential PUFAs are linoleic acid (C18:2, LA) that is particularly abundant in vegetable oils derived from soybean, corn, sunflowers, and rapeseed and alpha-linoleic acid (C18:3, ALA) that is predominantly found in flaxseed, soybean, canola oils, pumpkin seeds and pumpkin seed oil, perilla seed oil, tofu, walnuts and walnut oil, camelina, hempseed, and some algae. Linoleic acid is the precursor of ω-6 PUFAs and is converted into arachidonic acid (C20:4, AA) through the action of elongases (which add carbons to the hydrocarbon chain of the fatty acid) and desaturases (which replace single bonds with double bonds). Alpha-linoleic acid (C18:3, ALA) is the precursor of long-chain ω-3 PUFAs through elongation and desaturation of its acyl chain, leading to the formation of eicosapentaenoic acid (C20:5, EPA) which in turn is converted into docosahexaenoic acid (C22:6, DHA) [30][31] (Figure 1).
Figure 1. Structure of polyunsaturated fatty acids and their formation from parental molecules.
Although humans can endogenously synthesize long-chain ω-3 PUFAs (EPA, DHA) by elongation and desaturation of dietary ALA, it must be emphasized that these reactions in humans are slow and inefficient, so that the production rate of these compounds is very low [32]. The rate of conversion of ALA to EPA and DHA was estimated to be 20% and 10%, respectively, in women, with apparently lower values in men (8% and 10% correspondingly) [33][34][35]. The main source of EPA and DHA is indeed exogenous, mainly derived from fatty fish and seafood (mackerel, salmon, trout, seabass, oysters, sardines, and shrimp). A further element of complexity is represented by the fact that ω-3 PUFAs and ω-6 PUFAs both compete for the same enzymatic pathway involving elongases and desaturases, leading to the transformation of precursors ALA and LA into EPA/DHA and AA, respectively [36][37]. Although ALA is a more affine substrate for desaturases and elongases, some experimental evidence has demonstrated a slower enzymatic metabolism of ω-3 PUFAs as compared to ω-6 PUFAs [38]. Indeed, adequate intake of both ALA and LA is of paramount importance for human health, and the relative dietary proportions of precursor fatty acids (LA, ALA) determine the net rate of conversion to their respective long-chain derivatives [39][40]. Currently, western diets are abundant in ω-6 PUFAs, being found in meats and poultry alongside deep-fried foodstuffs, a characteristic that favors high LA intake, and relatively deficient in ω-3 PUFAs, with ratios of ω-6 PUFAs to ω-3 PUFAs as high as 15:1 to 16.7:1 [41]. Moreover, research suggests that most of the world's population including those who consume fish regularly have a low omega-3 index (O3i). This is defined as the ratio of EPA and DHA to total fatty acids in erythrocyte membranes and as a marker of overall ω-3 PUFA status and values below 8% [42][43] have been previously validated as a risk factor for cardiovascular disease [44].

2.2. PUFAs and Cellular Membranes

As structural components of membrane phospholipids, PUFAs influence membrane properties and modulate cellular function. Fatty acids are quickly incorporated in phospholipids of plasma, platelets, neutrophils, and red blood cells, whereas enrichment of other tissues takes a longer time. EPA and DHA interact differently with cellular membranes [45][46][47]. Preclinical data show that EPA has a more stable interaction with surrounding saturated fatty acids, contributing to membrane stability and inhibiting lipid oxidation and cholesterol domain formation. DHA is in a curved shape causing conformational changes that increase membrane fluidity and form cholesterol domains with reduced antioxidant activity. These peculiarities may at least in part account for the differences in their clinical effects, with EPA seemingly more efficient in the mitigation of the atherosclerotic process. ω-3 PUFAs accumulate preferentially in the cerebral cortex, retina, testes, muscle, and liver, while ῳ-6 PUFAs are ubiquitous in all tissues. ω-3 PUFAs are incorporated into membrane phospholipids, where they usually represent less than 10% of the total amount of fatty acids (in a typical western diet: 10–20% AA, 0.5–1% EPA, and 2–4% DHA). Of note, the dietary intake of ω-3 PUFAs can modify the composition of cell membranes in a relatively short time (from days to weeks) [48][49][50].
Plasma membranes consist of a mosaic of functional microdomains that facilitate interactions between resident proteins and lipids [51][52]. The lipid content of cell membranes affects the function of cells and intracellular organelles. Incorporation of ω-3 PUFAs into these membranes modifies membrane fluidity and biophysics, size, and composition of these microdomains, namely, lipid rafts and caveolae, that modulate protein function and signaling events. Lipid rafts are small heterogeneous membrane microdomains rich in cholesterol, sphingolipids, and saturated acyl chain [52][53] that influence membrane fluidity, protein–protein interaction, ion channel kinetics, signaling processes, and membrane protein and receptor trafficking. Caveolae represent a specific subtype of lipid raft macrodomain that forms flask-shaped membrane invaginations rich in proteins that play a role in endocytosis and signal transduction, including the structural protein caveolin-1 and many signal transduction proteins [54]. ω-3 PUFAs have been shown to increase the size and to change the content of cholesterol and sphingolipids of lipid rafts because of their low polar affinity with these types of lipids. These changes by modulating signaling events such as activation of G-protein, endothelial nitric oxide synthase (eNOS), tumor necrosis factor alpha (TNF-alpha), adhesion molecules, and Toll-like receptors (TLR) can contribute to the anti-inflammatory and antiatherosclerotic properties of ω-3 PUFAs [55][56][57]. For example, enrichment of cellular membranes with ω-3 PUFAs disrupts dimerization and recruitment of toll-like receptor-4, which might contribute to anti-inflammatory effects by down-regulation of nuclear factor-kappa B (NF-B) activation. On the other hand, the incorporation of ω-3 PUFAs into lipid membranes might modulate a variety of ion channels [58]. These include certain voltage-gated (Kv) and inwardly rectifying (Kir) K+ channels, voltage-gated (Nav) and epithelial (ENaC) Na+ channels, L-type Ca2+ channels, hyperpolarization-activated cyclic nucleotide-gated (HCN) channels, transient receptor potential (TRP) channels, various connexins, chloride channels, and P2X receptors [58].

2.3. PUFA and Intracellular Signaling

Modulation of physicochemical properties of cellular and organelle membranes is not the only mechanism through which ω-3 PUFAs exert their physiological effects. ω-3 PUFAs directly interact with membrane channels and proteins. For example, direct modulation of ion channels or G-protein-coupled receptor 120 (GPR 120) might contribute to antiarrhythmic or anti-inflammatory effects, respectively [59][60][61]. GPR 120, highly expressed in human adipocytes and macrophages, has been identified in recent years as the receptor of ω-3 PUFAs [62][63] and has been consequently renamed “Free fatty acid receptor 4” (FFAR4). Binding and activation of FFAR4 by ω-3 PUFAs in macrophages and Kupffer cells trigger a downstream signaling cascade leading to the assembly of ῳ-3PUFA/FFAR4/β-arrestin-2 complex, which in turn dissociates the TAK1/TAB1 heterodimer by binding to and inactivating the TAB1 subunit, consequently reducing NF-κB-mediated cyclooxygenase expression and inflammation [61]. Interestingly, in a study of rodents and lipopolysaccharide-primed bone-marrow-derived macrophages, the ῳ-3PUFA/FFAR4/β-arrestin-2 complex has also demonstrated to inhibit NOD-like receptor protein 3 (NLRP3) inflammasome-dependent inflammation [64]. NLRP3 inflammasome has been identified in the last decade as a functional bridge between inflammation and atherosclerosis [65], and its downregulation results in decreased levels of interleukin-1β and decreased production of interleukin-6 release by macrophages and C-reactive protein by hepatocytes. Moreover, ω-3 PUFAs directly regulate gene expression via nuclear receptors and transcription factors, being the natural ligands of many key nuclear receptors in multiple tissues, including peroxisome proliferator-activated receptors (PPAR-alpha, -beta, -delta, and -gamma), hepatic nuclear factors (HNF-4; -alpha and -gamma), retinoid X receptors (RXR), and liver X receptors (alpha and beta) [66][67][68][69][70][71]. ω-3 PUFAs are transported into the nucleus by cytoplasmic lipid-binding proteins. Sterol regulatory element binding protein-1c (SREBP-1c) is an example of a transcription factor whose function is altered by ω-3 PUFAs, contributing to their effects on lipid metabolism and inflammatory pathways [72][73].

2.4. PUFAs and Its Metabolites: Role of Oxylipins

A further mechanism of action of ω-3 PUFAs directly involves their metabolites (ω-3 Oxylipins) that in recent years have gathered great research interest. After being released from phospholipids by cytosolic phospholipase A2 (cPLA2), both ω-6 PUFAs and ω-3 PUFAs are oxygenated by different enzymes, such as cyclooxygenase (COX), lipoxygenase (LOX), and cytochrome P450 (CYP) enzymes. This leads to the synthesis of a broad variety of bioactive lipid compounds, many of which take part in the regulation of vascular function and exert potent anti-inflammatory effects [74][75]. “Classic oxylipins” are eicosanoids (including prostaglandins, thromboxanes, and leukotrienes) derived from both ῳ-6 PUFAs and ω-3 PUFAs. ω-6 PUFA AA is the precursor of two types of prostaglandins, thromboxanes, and four types of leukotrienes with strong pro-inflammatory, pro-thrombotic, and vasoconstrictive properties [76][77]. EPA is the precursor of three types of prostaglandins and five types of leukotrienes [37] that are 10- to 100-fold less biologically active than their counterparts that are derived from AA and are antagonistic with their effects on vascular tone, platelet aggregation, and inflammation [76]. In this context, when balancing of enzymatic conversions favors 3-series thromboxanes (TXA3 vs. TXA2) and prostacyclines (PGI3 vs. PGI2), the effects of PGI prevail because of the relative power of these molecules. In vitro and in vivo experiments show that AA metabolizing P450-enzymes can use EPA and DHA as alternative substrates. Therefore, EPA/DHA supplementation shifts the P450-eicosanoid profile to EPA- and DHA-derived epoxy- and hydroxy-metabolites (17,18-epoxy-EPA and 19,20-epoxy-DHA) that are commonly identified as CYP eicosanoids [78]. These eicosanoids show protective vasoactive actions and antiarrhythmic properties in cardiomyocytes and are linked to the development of hypertension, myocardial infarction, pathological cardiac hypertrophy, stroke, kidney injury, and other inflammatory disorders [78][79]. Besides “classic oxylipins”, ω-3 PUFAs can generate some other oxylipins, designated “specialized pro-resolving mediators” (SPM), that participate in the resolution of inflammation and exert protective and beneficial effects on a variety of inflammatory diseases [80][81]. These compounds include resolvins, protectins, and maresins. EPA generates E-series resolvins (RvE1, RvE2, and RvE3) through the action of COX, while D-series resolvins (RvD1-D6), protectins, and maresins (including MaR1 and MaR2) are derived from DHA, through the actions of LOX [80]. Moreover, some ῳ-3 oxylipins, including protectin DX, maresin 1, and resolvin D1, display antioxidant capacity by regulating the expression of antioxidant proteins including catalase, superoxide dismutase, and glutathione peroxidase activity and attenuating lipid peroxidation and O2-generation [82][83].
In summary, the incorporation of ω-3 PUFAs in membrane phospholipids improves membrane fluidity and biophysical properties by changing lipid rafts and caveolae characteristics, thereby leading to modulation of protein–protein interaction and ion channel kinetics. These membrane changes involve also intracellular organelles and trigger a multiplicity of intracellular signaling mechanisms that can contribute to the antiatherosclerotic properties of ω-3 PUFAs and to the regulation of peripheral vascular tone (Figure 2).
Figure 2. Schematic representation of actions of omega-3 polyunsaturated fatty acids (ω-3 PUFAs) on cell membranes and intracellular signaling and their relevance for perivascular adipocytes and vascular cell functions. EEQ, epoxyeicosatetraenoic acid; NADPH, nicotinamide adenine dinucleotide; SOD, superoxide dismutase; XO, xanthine oxidase; PVAT, perivascular adipose tissue; ADRF, adventitium-derived relaxing factor; COX, cyclooxygenase; PGI2, prostacyclin; NO, nitric oxide; eNOS, endothelial nitric oxide synthase; ADMA, asymmetric dimethylarginine; EET, epoxyeicosatrienoic acid; endothelium-derived hyperpolarizing factor; BKCa, large-conductance voltage- and calcium-activated potassium channel; TRPV-4, transient receptor potential vanilloid-4; TRPC1/5, transient receptor potential cation.

3. ω-3 PUFAs and Blood Pressure

The effect of ω-3 PUFAs on BP has been well characterized in the past three decades across multiple trials, systematic reviews, and meta-analyses, most of which included both hypertensive and normotensive individuals. Overall, meta-analyses have shown that relatively high doses of ω-3 PUFAs, usually more than 3 g/day, lead to small albeit meaningful BP reductions, particularly in subjects with untreated hypertension. The first meta-analysis appeared in 1993 and included 17 controlled clinical trials (6 in untreated hypertensive subjects without any other comorbidity and 11 in normotensives) reporting a reduction in systolic BP (SBP) and diastolic BP (DBP) that was significant only in hypertensives (−5.5 and −3.5 mm Hg, respectively) [84], with a median ω-3 PUFA dose of 5 g/day that was administered for a median of 8 weeks. Another meta-analysis that included 31 controlled clinical trials with 1356 healthy or hypertensive participants confirmed a significant reduction in SBP and DBP only in hypertensive patients (−3.4 and −2 mm Hg, respectively) who took an average ω-3 PUFA dose of 4.8 g/day in the form of fish or fish oil for 3 to 24 weeks [85]. Another meta-analysis included a total of 36 studies, 22 of which had a double-blind design [86]. Fish oil reduced SBP by 2.1 mm Hg and DBP by 1.6 mm Hg with effects that tended to be greater in hypertensive subjects older than 45 years. Effects of ω-3 PUFAs on BP were the object of further subsequent meta-analyses [87][88][89][90][91], all showing a small but significant reduction in BP levels. These results have been recently corroborated by an umbrella meta-analysis [92] that included 10 meta-analyses of 131 studies carried out between 1989 and 2021 with ω-3 PUFA supplements across studies of 2.2 to 6 g/day and duration of exposure from 4 to 29 weeks. This meta-analysis has confirmed that ω-3 PUFA decreases SBP (−1.19 mm Hg; 95% CI: −1.76, −0.62, p < 0.001) and DBP levels (−0.91 mm Hg, 95% CI: −1.35, −0.47; p < 0.001) with effects that were more prominent in older hypertensive subjects who were supplemented with doses greater than 2 g/day for more than 10 weeks. Although results of meta-analyses indicate an effect of ω-3 PUFA supplementation in reducing BP, important variability of findings in individual studies reflecting heterogeneity in the source (fish, fish oil, capsules enriched with ethyl-ester forms of DHA and EPA, powders), the relative content of EPA and DHA, duration of exposure, and differences in terms of comorbidities and additional treatments should not be overlooked [93]. In addition, as for any other dietary intervention study, assessment of compliance to prescription is particularly problematic and only a minority of studies were controlled with measurement of ω-3 PUFA content in cellular membranes. Researchers prospectively followed a group of uncomplicated hypertensive patients who were advised to eat a meal of farmed fish fed with PUFA-enriched chow three times a week for 6 months. Ambulatory BP monitoring and ω-3 PUFA content in red blood cell plasma membranes were evaluated at baseline and at the end of the study. Twenty-four-hour and nighttime BP were significantly reduced only in those patients who had increased membrane ω-3 PUFA content with an effect that was more pronounced in those with lower baseline ω-3 PUFA content [94] (Figure 3).
Figure 3. Changes in blood pressure levels as measured by noninvasive ambulatory blood pressure monitoring (ABPM) in hypertensive patients who ate 3 weekly meals of trout rich in polyunsaturated fatty acids for 6 months. Changes are represented according to change (↑ increase; ↓ decrease) in erythrocyte cell membrane polyunsaturated to saturated fatty acid ratio (PUFA/SFA). Only hypertensive patients with an increased PUFA/SFA had significant 24-hour and nighttime blood pressure reduction. * p < 0.05.
Although the BP-lowering effect of ω-3 PUFAs was sufficiently well characterized across multiple intervention trials and meta-analyses, observations on the dose–response relationship between ω-3 PUFAs and BP reduction were conflicting. Early meta-analyses suggested a linear relationship [84][86][88], whereas nonlinear relationships were suggested in other meta-analyses that reported either a J-shaped [95] or L-shaped [96] association. In a further and more recent meta-analysis that was specifically designed to analyze the dose–response relationship of ω-3 PUFA intake with BP, Zhang et al. [97] included 71 studies involving 4973 individuals. Results indicated a nonlinear J-shaped association with a greater reduction in BP that was obtained with doses between 2 g/day (SBP, −2.61 mm Hg (95% CI, −3.57 to −1.65); DBP, −1.64 mm Hg (95% CI, −2.29 to −0.99)) and 3 g/day (SBP, −2.61 mm Hg (95% CI, −3.52 to −1.69); DBP, −1.80 mm Hg (95% CI, −2.38 to −1.23)) further providing evidence of a greater effect in untreated hypertensive subjects. This ω-3 PUFA-induced decrease in BP is of clinical significance on a population level, as previous studies have estimated that a 2 mm Hg reduction in SBP reduces stroke mortality by 10% and deaths from ischemic heart disease by 7% [93], leading to 30.045 fewer major cardiovascular events [98]. Thus, current evidence suggests that ω-3 PUFA supplementation might have a potential place in the treatment of low-risk patients with mild grade-1 hypertension in addition to other interventions on lifestyle.

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