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Briones-Valdivieso, C.; Briones, F.; Orellana-Urzúa, S.; Chichiarelli, S.; Saso, L.; Rodrigo, R. Antioxidant Bioactive Molecules against Ischemic Stroke. Encyclopedia. Available online: https://encyclopedia.pub/entry/55847 (accessed on 03 July 2024).
Briones-Valdivieso C, Briones F, Orellana-Urzúa S, Chichiarelli S, Saso L, Rodrigo R. Antioxidant Bioactive Molecules against Ischemic Stroke. Encyclopedia. Available at: https://encyclopedia.pub/entry/55847. Accessed July 03, 2024.
Briones-Valdivieso, Camilo, Felipe Briones, Sofía Orellana-Urzúa, Silvia Chichiarelli, Luciano Saso, Ramón Rodrigo. "Antioxidant Bioactive Molecules against Ischemic Stroke" Encyclopedia, https://encyclopedia.pub/entry/55847 (accessed July 03, 2024).
Briones-Valdivieso, C., Briones, F., Orellana-Urzúa, S., Chichiarelli, S., Saso, L., & Rodrigo, R. (2024, March 05). Antioxidant Bioactive Molecules against Ischemic Stroke. In Encyclopedia. https://encyclopedia.pub/entry/55847
Briones-Valdivieso, Camilo, et al. "Antioxidant Bioactive Molecules against Ischemic Stroke." Encyclopedia. Web. 05 March, 2024.
Antioxidant Bioactive Molecules against Ischemic Stroke
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This entry is adapted from the peer-reviewed paper 10.3390/biomedicines12030501

Stroke is a major contributor to global mortality and disability. While reperfusion is essential for preventing neuronal death in the penumbra, it also triggers cerebral ischemia-reperfusion injury, a paradoxical injury primarily caused by oxidative stress, inflammation, and blood–brain barrier disruption. An oxidative burst inflicts marked cellular damage, ranging from alterations in mitochondrial function to lipid peroxidation and the activation of intricate signalling pathways that can even lead to cell death.

stroke oxidative stress antioxidants

1. Polyphenols

Polyphenols comprise a diverse group of antioxidants, sharing a common feature of containing at least one aromatic ring with multiple hydroxyl groups [1]. Some polyphenols, such as resveratrol [2], curcumin [3], and quercetin [4], have been studied to assess their neuroprotective effects, and several mechanisms have been implicated.
Although until now, resveratrol has been used to treat some forms of cancer, inflammation, diabetes, and myocardial IRI, among other diseases, the neuroprotective effects of resveratrol have been demonstrated through its antioxidant function (upregulate HO-1 and SOD), anti-inflammatory (downregulate TLR4), and antiapoptotic (reduce the activity of caspase-3) effects. Moreover, resveratrol’s neuroprotective potential could also be attributed to regulating the JAK/STAT pathway [2].
Curcumin exerts direct protective effects against cerebral ischemia by multiple mechanisms, such as inhibiting mitochondrial-induced apoptosis and endoplasmic reticulum stress while stimulating neurogenesis. Indirectly, it fosters neuroprotection by shifting microglia polarisation from the proinflammatory M1 state to the anti-inflammatory M2 state [3]. Additionally, curcumin demonstrates anti-inflammatory effects by inhibiting the NLRP3-inflammasome [3].
Similarly, quercetin offers protective effects by inhibiting autophagy and acting as an antioxidant through HO-1 upregulation [4]. Furthermore, it facilitates microglia M2 polarisation by modulating the PI3K/Akt/NF-κB signalling pathway [4][5].

2. Carotenoids

Carotenoids, including β-carotene (βCAR), are known for their potent antioxidant properties, exerting neuroprotective effects against cerebral IRI. βCAR demonstrates neuroprotection by inhibiting caspase-dependent apoptosis, evidenced by the downregulation of Bax and upregulation of Bcl-2 mRNA expression. Additionally, it exerts anti-inflammatory effects by inhibiting NF-κB expression, resulting in decreased production of pro-inflammatory cytokines such as TNF-α, IL-6, IL-1β, as well as COX-2, and iNOS [6]. Another noteworthy carotenoid, astaxanthin (ATX), structurally similar to βCAR, has consistently shown promising results in reducing cerebral infarction size and caspase-3 activity in rat models of cerebral ischemia [6]. ATX, being lipid-soluble, boasts a broad spectrum of pharmacological effects, including anticoagulant, anti-inflammatory, and antioxidant properties. Interestingly, ATX can penetrate the BBB, exhibits low toxicity, and has higher antioxidant activity than other carotenoids such as α-carotene, βCAR, lycopene, and lutein. Moreover, ATX has been associated with the enhancement of SOD1 and SOD2 expressions, indicating its potential to promote antioxidant defence mechanisms. However, further investigation into its impact on markers of Nrf2 activations is warranted [7].

3. Vitamins

Vitamins represent another interesting group due to their antioxidant properties and potential neuroprotective effects. For instance, studies have indicated that high-dose supplementation of 1,25-vitamin D3 can mitigate cerebral damage following a stroke [8]. Although the precise regulatory mechanism by which vitamin D confers protection against cerebral IRI remains elusive, it is suggested that vitamin D may activate the Nrf2/HO-1 antioxidant pathway while suppressing the NLRP3-mediated pyroptotic pathway [8].
Moreover, supplementation of folic acid, a type of vitamin B essential for nervous system development and function, holds promise in stroke prevention and as a potential treatment to ameliorate ischemic injury-induced cognitive decline. Folic acid supplementation may achieve this by inhibiting excitotoxicity, as evidenced by the downregulation of NMDAR expression [9].
Additionally, all-trans retinoic acid (ATRA), an active metabolite of vitamin A, has been investigated for its potential to preserve BBB integrity. Promising findings suggest that ATRA administration inhibits JNK and P38 phosphorylation while also reducing MMP-9 content, indicating its potential to safeguard BBB integrity [10].

4. Hormones

Due to its low toxicity, melatonin, a hormone mainly produced and secreted by the pineal gland, has undergone extensive study for its protective effects against various neurological disorders, including IS. Melatonin administration has demonstrated protective effects against cerebral IRI by mitigating excitotoxicity, OS, endoplasmic reticulum stress, mitochondrial dysfunction, and BBB injury. Additionally, melatonin has been shown to reduce glial activation, inflammasome formation, pyroptosis, and necroptosis by downregulating the high-mobility group box protein 1 (HMGB1)/TLR4/NF-κB signalling pathway [11]. In light of these findings, a recent pilot clinical study evaluated melatonin’s potential efficacy in treating acute IS patients unable to receive reperfusion therapy, yielding promising results for functional improvement and neurological recovery [12].
Studies involving other hormones have demonstrated that administering oestrogen and progesterone after brain ischemia protects against glutamate neurotoxicity, likely through modulation of glutamate transporter expression, thereby enhancing glutamate re-uptake [13]. Additionally, erythropoietin exhibits a neuroprotective role in experimental models of ischemia/reperfusion, hypoxia-ischemia, subarachnoid haemorrhage, and cerebral infarction by activating STAT, which plays a crucial role in neuronal survival and anti-apoptosis [14].

5. Others

Several other potential neuroprotective antioxidants and their mechanisms are summarised in Figure 1 and Table 1. Notably, acetyl-L-carnitine and coenzyme Q10 (CoQ10) have emerged as promising drugs for mitigating IS damage [15][16].
Figure 1. Pathways of cell damage and possible antioxidant target. NLRP3: Leucine-rich repeat protein 3; ROS: reactive oxygen species; JAK2: Janus kinase 2; STAT3: signal transducer and activator of transcription 3; PI3K: phosphoinositide 3-kinase; Akt: protein kinase B; mTOR: mammalian target of rapamycin; Bcl2: B-cell lymphoma 2; Bax: Bcl-2-associated X protein; Sirt1: silent information regulator 1; NF-κB: nuclear factor-kappa B; Nrf2: nuclear factor erythroid 2-related factor 2; TLR: Toll-like receptor; DHBAc: dihydroxybenzoic acid; KLF4: Krüppel-like factor 4; TRX1: thioredoxin 1; HO-1: heme oxygenase-1; NQO1: NAD(P)H quinone oxidoreductase 1; GPX4: glutathione peroxidase 4; GSH: glutathione; xCt: cystine/glutamate antiporter.
Acetyl-L-carnitine is an antioxidant derived from carnitine, widely distributed in mammalian tissues, especially in the liver and skeletal muscles. It has demonstrated potential in inhibiting atherosclerosis by regulating blood lipids and suppressing OS and inflammatory gene expression [17]. A recent pilot clinical trial evaluated its efficacy in treating acute IS patients ineligible for reperfusion therapy, revealing promising outcomes. It was suggested that acetyl-L-carnitine’s neuroprotective activity may stem from its regulation of inflammation and OS, as evidenced by significant declines in serum levels of TNF-α, ICAM-1, IL-6, and NSE, along with substantial increases in serum levels of SOD, total antioxidant capacity (TAC), and GPX in treated patients [16].
CoQ10, recognised for its potent antioxidant effects on mitochondrial and lipid membranes, has shown promise as a neuroprotective agent [18], and its role in modulating the expression of genes involved in inflammation and apoptosis pathways is well documented [19]. Past studies have assessed the potential therapeutic role of CoQ10 for preventing dopaminergic neuron degeneration in the context of Parkinson’s disease and thus suppressing the progression of this disease [18]. Furthermore, due to the role of CoQ10 as a free radical scavenger in IS [19], it has been clinically studied for improving outcomes in patients suffering from acute IS, where CoQ10 supplementation significantly improved the National Institutes of Health Stroke Scale (NIHSS) and mini mental state examination (MMSE) scores. However, no significant differences were found in the modified Rankin scale (mRS) score, MDA, SOD, and GFAP compared to placebo [15].
In animal models, several other substances have proven to be effective, for instance, the following:
  • Salvianolic acid B (Sal B), a hydrophilic caffeic acid derived from Salvia miltiorrhiza, has been widely studied due to its antioxidative, anti-inflammatory, and neuroprotective properties, probably mediated by blocking the TLR4, p-p38 MAPK, p-JNK, IL-1β, and NF-κB pathways [20].
  • Rhein, an anthraquinone, exerts neuroprotective effects by regulating the NRF2/SLC7A11/GPX4 pathway, inhibiting ferroptosis during IRI following a stroke in murine models [21].
  • Osmundacetone [22], a natural antioxidant, and Ruscogenin [23], a steroidal sapogenin, have shown effectiveness in reducing the IRI in stroke models in rats by increasing the concentration of Nrf2 mRNA, HO-1, and NQO1. Osmundacetone has also decreased Keap1 and caspase 3 [22].
  • Crebabine, an alkaloid with neuroprotective effects, was shown to be effective in a murine model of stroke, reducing cerebral damage by suppressing NADPH and NOX2 activity and through the inhibition of the NF-κB and MAPK pathways [24].
  • Glycosides, derived from the Buyang Huanwu Decoction, exert a neuroprotective effect in murine stroke models by reducing pyroptosis by regulating the Nrf2 pathway [25].
  • The Krüppel-like factor 4 (KLF4) is a transcription factor related to several cell processes, such as cell proliferation and apoptosis. In murine models, its administration as a recombinant human KLF4 protein has been shown to effectively reduce cerebral IRI’s brain damage by inhibiting cellular oxidative stress through the Nrf2/Trx1 pathway [26].
  • Cerebrolysin is a mixture of neuropeptides that, through the inhibition of the TLRs/NF-kB/cytokines pathways and the activation of the Keap1/Nrf2 pathway, has shown to be neuroprotective in murine models of cerebral IRI [27].
Table 1. Examples of potential antioxidants for neuroprotection and pathways involved.
Family Drug Results Type of Model Ref.
Polyphenols Resveratrol Nrf2: Upregulate HO-1 and SOD [28]
NF-κB: Downregulate TLR4 [29]
Sirt1: Downregulate caspase-3 activity [30]
Upregulate JAK, ERK, and STAT [31]
Upregulate ERK and CREB [32]
Upregulate of BDNF/TrkB signalling pathway [33]		 Rat models of cerebral ischemia/reperfusion injury summarised through a meta-analysis [2] [2]
Curcumin Downregulate NLRP3 inflammasome Rat models of cerebral ischemia/reperfusion injury [3]
Quercetin Nrf2: Upregulate HO-1
Downregulate autophagy
Upregulate PI3K/AKT/mTOR pathway		 Rat models of cerebral ischemia/reperfusion injury [4]
Demethylnobiletin (polymethoxy-flavanone) Nrf2: Upregulate HO-1 Rat models of cerebral ischemia/reperfusion injury [34]
Carotenes Beta-carotene NF-κB: Downregulate caspase-3, and Bax
Upregulate Bcl-2 expression		 Rat models of cerebral ischemia/reperfusion injury [6]
Astaxanthin Upregulate expression of SOD1 and -2 Gerbil models of cerebral ischemia/reperfusion injury [7]
Vitamins Vitamin D Nrf2: Upregulate HO-1
Downregulate NLRP3-mediated pyroptosis		 Rat models of cerebral ischemia/reperfusion injury [8]
Folic acid Downregulate neurotoxicity by downregulation of NMDAR expression Rat models of cerebral ischemia/reperfusion injury [9]
ATRA Downregulate the JNK/P38 MAPK pathway Rat models of cerebral ischemia/reperfusion injury [10]
Hormones Melatonin Downregulate the HMGB1: modulates pyroptosis and necrosis
Modulation of the TLR4/NF-κB signalling pathway: Upregulate anti-inflammatory mediators
MAPK regulation: Downregulate apoptosis		 Obese rat models of cerebral ischemia/reperfusion injury [11]
Oestrogen
Progesterone		 Decrease neurotoxicity by modulating glutamate transporter expression and inducing glutamate re-uptake Rat models of cerebral ischemia/reperfusion injury [13]
Erythropoietin Upregulate STAT Rat models of cerebral ischemia/reperfusion injury [14]
Other Coenzyme Q10 NF-κB: Downregulate p65, TNF-α, and IL-6
Downregulate caspase-3 apoptosis		 Rat models of cerebral ischemia/reperfusion injury [35]
Acetyl-L-carnitine Suppress excitotoxicity
NF-κB: Downregulate p65, TNF-α, and IL-6
Downregulate caspase-3 apoptosis		 Rat models of cerebral ischemia/reperfusion injury [35]
Salvianolic acid B (Sal B) Downregulate TLR4, NF-κB, and IL-1β Mice models of cerebral ischemia/reperfusion injury [20]
Rhein Nrf2/SLC7A11/GPX4 axis: Inhibit ferroptosis Rat models of cerebral ischemia/reperfusion injury [21]
Osmundacetone Nrf2: Upregulate HO-1 and NQO1
Downregulate caspase-3 pathway		 Rat models of cerebral ischemia/reperfusion injury [22]
Ruscogenin Nrf2 pathway Mice models of cerebral ischemia/reperfusion injury [23]
Crebanine Downregulate oxidative stress and neuroinflammation mediated by NOX2 in microglia Rat models of cerebral ischemia/reperfusion injury [24]
Glycosides Nrf2: Downregulate pyroptosis Rat models of cerebral ischemia/reperfusion injury [25]
KLF4 Nrf2: Trx1 pathway Rat models of cerebral ischemia/reperfusion injury [26]
Cerebrolysin Downregulate TLR/NF-κB/cytokines
Upregulate the Keap1/Nrf2/antioxidant signalling pathway		 Mice models of cerebral ischemia/reperfusion injury [27]
Akt: Protein kinase B; BDNF: brain-derived neurotrophic factor; CREB: cAMP response element-binding protein; ERK: extracellular signal-regulated kinase; GPX: glutathione peroxidase; IL: interleukin; JAK: Janus kinase; JNK: c-Jun N-terminal kinase; Keap1: Kelch-like ECH-associated protein 1; HMGB1: high-mobility group box protein 1; HO-1: heme oxygenase-1; MAPK: mitogen-activated protein kinase; mTOR: mammalian target of rapamycin; NLRP3: NLR family pyrin domain containing 3; NtabMDAR: N-methyl-D-aspartate receptor; Nrf2: nuclear factor erythroid 2-related factor 2; NF-κB: nuclear factor kappa-light-chain-enhancer of activated B cells; NQO1: NAD(P)H quinone dehydrogenase 1; PI3K: phosphatidylinositol-3-kinase; Sirt1: sirtuin 1; SLC7A11: solute carrier family 7 member 11; SOD: superoxide dismutase; STAT: signal transducer and activator of transcription; TLR: Toll-like receptor; TNF: tumour necrosis factor; TrkB: tyrosine receptor kinase B.

References

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Subjects: Neurosciences
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Camilo Briones-Valdivieso
,
Felipe Briones
,
Sofía Orellana-Urzúa
,
Silvia Chichiarelli
,
Luciano Saso
,
Ramón Rodrigo
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Update Date: 05 Mar 2024
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