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Mirza, F.J.; Zahid, S.; Holsinger, R.M.D. Carnosic Acid and Mechanisms of Neuroprotection. Encyclopedia. Available online: https://encyclopedia.pub/entry/42534 (accessed on 26 December 2024).
Mirza FJ, Zahid S, Holsinger RMD. Carnosic Acid and Mechanisms of Neuroprotection. Encyclopedia. Available at: https://encyclopedia.pub/entry/42534. Accessed December 26, 2024.
Mirza, Fatima Javed, Saadia Zahid, R. M. Damian Holsinger. "Carnosic Acid and Mechanisms of Neuroprotection" Encyclopedia, https://encyclopedia.pub/entry/42534 (accessed December 26, 2024).
Mirza, F.J., Zahid, S., & Holsinger, R.M.D. (2023, March 25). Carnosic Acid and Mechanisms of Neuroprotection. In Encyclopedia. https://encyclopedia.pub/entry/42534
Mirza, Fatima Javed, et al. "Carnosic Acid and Mechanisms of Neuroprotection." Encyclopedia. Web. 25 March, 2023.
Carnosic Acid and Mechanisms of Neuroprotection
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This entry is adapted from the peer-reviewed paper 10.3390/molecules28052306

Carnosic acid (CA) is a diterpenoid abundantly present in plants belonging to the genus Rosmarinus and Salvia of the family Lamiaceae, accounting for their application in traditional medicine. CA exerts its neuroprotective effects through a diverse range of mechanisms, some of which include the prevention of amyloid-β (Aβ)-induced neurodegeneration, induction of autophagy, alleviation of oxidative stress and via anti-apoptotic effects.

neuroprotection carnosic acid natural sources neurodegeneration autophagy oxidative stress

1. Induction of Autophagy

The pathogenesis of most neurodegenerative disorders bears a resemblance to the manner in which the pathogenic proteins are disposed of by neurons and glia. Autophagy, a homeostatic process by which the degradation of long-lived cellular proteins, lipids, and dysfunctional organelles occur within the lysosomal machinery, plays a crucial role in maintaining the metabolic balance between synthesis, degradation, and subsequent turnover of cytoplasmic material [1][2][3]. Since it prevents the buildup of protein aggregates and damaged mitochondria and organelles, loss of autophagy or its dysregulation may lead to atrophy and neuronal death [4]. Autophagic dysregulation is also implicated in neurodegenerative disorders such as Alzheimer’s disease (AD), Parkinson’s disease (PD), Huntington’s disease (HD), amyotrophic lateral sclerosis (ALS), and lysosomal storage disorders (LSDs) [3].
A study employing human neuroblastoma SH-SY5Y cells revealed an instrumental role for CA in the reduction of Aβ-induced apoptosis and the accumulation of toxic proteins through the induction of autophagy. Aβ aggregation is a hallmark feature of AD and is a key target of AD-related therapies. The study by Liu and colleagues demonstrated that CA-induced autophagy via AMP-activated protein kinase (AMPK) is an important regulator of cellular metabolism [5]. AMPK triggers autophagy to avoid oxidative stress and mitochondrial dysfunction in cells treated with CA, highlighting a therapeutic mechanism of CA against Aβ [5]. In vitro studies that investigated the effect of pre-treating SH-SY5Y cells with CA prior to serum starvation revealed that pretreatment significantly protected these cells against nutrient depletion [6]. The cytoprotective effects of CA were afforded by the phosphorylation of protein kinase B (Akt) and extracellular signal-regulated kinase 1/2 (Erk1/2) and moderate activation of autophagy since pretreatment with LY294002 and U-0126, inhibitors of Akt and Erk1/2 phosphorylation, abolished the protective effects [6].
Another mechanism by which CA influences autophagy is through the parkin pathway. Parkin is an E3 ubiquitin ligase that catalyzes the conjugation of ubiquitin to abnormal proteins, facilitating their degradation by the ubiquitin proteasome system (UPS) [7]. Parkin gene mutations have been implicated in the pathogenesis of neurodegenerative diseases, including Parkinson’s [8][9][10]. CA was shown to prevent cell death via induction of the parkin pathway, enhancing levels of parkin protein, the UPS, and α-synuclein degradation [11]. The interaction between parkin and Beclin1 is considered to facilitate autophagosome maturation [12]. CA substantially enhances the parkin/Beclin1 interaction, inducing autophagy [13]. These effects were attenuated by wortmannin and bafilomycin A1 (an autophagosome-lysosome fusion blocker) [13]. Moreover, CA has also been shown to mitigate mitochondrial impairment, which also involves the activation of the PINK1/parkin/mitophagy pathway [14]. The neuroprotective effects of CA have also been attributed to the upregulation of OPA1 (OPA1 mitochondrial dynamin-like GTPase) via activation of the parkin/IKKγ/p65 pathway and are associated with an enhancement of mitochondrial biogenesis. This pathway is linked to the inhibition of Parkin-interacting substrate (PARIS) and induction of proliferator-activated receptor gamma coactivator-1-alpha (PGC-1α) by parkin [15][16]. This interaction has been shown to prevent the degeneration of dopaminergic neurons, demonstrating the therapeutic potential of CA against PD [16].

2. Alleviation of Oxidative Stress

Oxidative stress is a major contributing factor to neurodegenerative disorders [17]. Many studies have highlighted the anti-inflammatory and anti-oxidative properties of CA. Hou and colleagues [18] demonstrated the neuroprotective effect of CA on neuronal cells subjected to ischemia/hypoxia injury via the scavenging or reduction of ROS (reactive oxygen species) and NO (nitric oxide) and inhibition of COX-2 and MAPK pathways [18]. CA also displayed protective effects against 6-hydroxydopamine (6-OHDA)-induced neurotoxicity by increasing the expression of antioxidant enzymes, including c-glutamate-cysteine ligase catalytic (GCLC) subunit, c-glutamate-cysteine ligase modifier (GCLM) subunit, superoxide dismutase (SOD), and glutathione reductase [19]. Furthermore, CA was also demonstrated to be cytoprotective against chlorpyrifos (CPF)-induced inflammation, oxidative stress, and neurotoxicity in brain and eye tissues of mice [20] as well as in SH-SY5Y cells [21]. CA protects against oxidative stress by employing various mechanisms, among which the induction of Nrf2-ARE and the activation of PI3K/Akt signaling pathways are the most significant and widely studied.

3. Attenuation of Apoptosis

Although many studies highlight the role of CA in modulating autophagy, as discussed earlier, it is also found to play a critical role in the attenuation of apoptosis. Investigations have used variously in vitro and in vivo models of apoptosis to evaluate the neuroprotective role of CA and have revealed regulation at the level of apoptosis-inducible genes [22]. Studies in cultured dopaminergic cells (SN4741) employing the organochlorine pesticide dieldrin, which is known to be a risk factor for PD, revealed that neuroprotection afforded by CA was due to the repression of apoptosis-related caspase-3 and -12 and the stress signaling molecule c-Jun N-terminal kinase (JNK) [23]. Pretreatment of SN4741 cells with CA also significantly attenuated the downregulation of BDNF, a key molecule associated with dopaminergic neuron survival and maturation [23]. Treatment of these cells with dieldrin resulted in a 61% reduction in BDNF release from these cells, whereas pretreatment with 10 μM CA maintained levels of BDNF at basal expression [23]. Intriguingly, these results suggest that treatment of SN4741 cells with 10 μM CA results in a 1.5-fold increase in levels of BDNF, suggesting that prophylactic treatment with CA may support dopaminergic and other cells in the brain.
CA was also reported to exert a neuroprotective effect following subarachnoid hemorrhage induced by early brain injury through the inhibition of apoptosis [24]. Rats were subjected to a sub-arachnoid hemorrhage procedure, and those in the experimental group were then administered a 3 mg/kg dose of CA intraperitoneally. CA was shown to ameliorate brain edema and blood-brain barrier (BBB) disruption, as well as reduce neuronal death via apoptosis [24]. CA was also shown to increase SIRT1, a member of the highly conserved (NAD+)-dependent class of histone deacetylases responsible for combatting ROS and apoptosis, MnSOD (manganese superoxide dismutase, a metalloprotein that prevents mitochondrial dysfunction) and Bcl-2 (the founding member of a family of regulator proteins that regulate cell death) expression [24], as well as decreased p66shc, Bax, and cleaved caspase-3 expression. The anti-apoptotic effects of CA were proposed to be facilitated through the SIRT1/p66shc signaling pathway [24][25].
Importantly, CA was shown to inhibit cell growth and induce apoptosis in IMR-32 human neuroblastoma IMR-32 cells [26]. The induction of apoptosis was accompanied by ROS-mediated p38 MAPK activation resulting in a decrease in cell viability [26]. Intriguingly, these results suggest that the activity of CA is selective in its regulation of cell viability and apoptosis, whereby these processes are activated by CA to restore physiological states, implying the substantive therapeutic potential of this compound that warrants extensive investigation.

4. Effects of Carnosic Acid in Amyloid-β-Mediated Neurodegeneration

Brain atrophy associated with the deposition of Aβ in extracellular neuritic plaques is the most prominent neuropathological hallmark of Alzheimer’s disease (AD) [27]. Aβ-peptide, which constitutes the major component of amyloid plaques, is a 4-kDa peptide formed by the proteolytic cleavage of the amyloid precursor protein (APP) by β-secretase and the γ-secretase complex of proteins [28][29]. Cleavage of APP by β-secretase (β-site APP-cleaving enzyme-1 (BACE1)) catalyzes the critical step in the generation of Aβ. However, the constitutive pathway of APP processing is via α-secretase cleavage that results in the generation of a soluble ectodomain fragment termed soluble APPα (sAPPα), which possesses neurotrophic and neuroprotective properties [30][31][32]. The protective role of CA against neurodegeneration resulting from the presence of Aβ is well documented. An investigation of the effects of CA on Aβ production in SH-SY5Y human neuroblastoma cells revealed a critical role for this antioxidant in the suppression of Aβ42 generation, an isoform of the peptide that is known to be more hydrophobic and toxic as well as possessing faster oligomerizing properties compared to Aβ40. In the presence of CA, APP cleavage was shuttled to the α-secretase pathway, thereby precluding Aβ generation [33]. This shuttling in the presence of CA is driven by the upregulation of tumor necrosis factor-α-converting enzyme (TACE) mRNA, a member of the ADAM (a disintegrin and metalloproteinase) family of proteases, which contributes to α-secretase cleavage of APP [33]. Similarly, a substantial reduction in Aβ production by CA via the activation of TACE was evident in U373MG human astrocytoma cells [34]. Aβ also interacts with N-methyl-D-aspartate receptors (NMDARs) to induce apoptosis and synaptic dysregulation. In another study on SH-SY5Y cells, CA was shown to inhibit the phosphorylation of the NMDAR subtype 2B (NMDAR2B) receptor, thereby suppressing apoptosis and restoring expression of synaptic proteins including BDNF, postsynaptic density protein-95 (PSD-95), and synaptophysin [35]. Additionally, CA significantly attenuated apoptosis induced by Aβ42/43, further highlighting its therapeutic potential against Aβ-induced neurotoxicity [36].
In vivo, CA has been demonstrated to be protective to neurons in subfield CA1 (cornu Ammonis) of the hippocampus in an acute experimental rat model of AD (bilateral administration of Aβ into the hippocampus) where Aβ accumulation leads to neurodegeneration of the hippocampus [37]. Employing a similar in vivo paradigm, Rasoolijazi and colleagues [38] demonstrated the neuroprotective effects of CA on cognitive impairment associated with Aβ-induced neurotoxicity in the rat hippocampus. CA was shown to significantly improve short-term and spatial memory attributes in rat models of AD [38]. Furthermore, CA also delayed the deposition of Aβ and protected cells against Aβ-induced cholinergic and mitochondrial dysfunction in a Caenorhabditis elegans model of AD [39], thereby reiterating its promising potential as a neuroprotective agent against AD-associated neurodegeneration.
In recent efforts incorporating biomedical advances, nano-carrier packaged CA reduced the deposition of Aβ, subsequently restoring cognitive deficits through the inhibition of the CCAAT-enhancer-binding protein β (CEBPβ)-NFκB signaling pathway in APP/PS1 mice [40].

5. Effects of Carnosic Acid in Models of Neuronal Injury

Intriguingly, CA also alleviated symptoms of metabolic-disease-induced brain injury through the modulation of inflammatory responses. In a high-fat-diet-induced mouse model, CA facilitated a significant decrease in the expression of various pro-inflammatory cytokines regulated by the NF-κB signaling pathway, including interleukin (IL)-1β, IL-6 and tumor necrosis factor-α (TNF-α). Additionally, it also modulated the apoptotic pathway through the increased expression of anti-apoptotic Bcl-2 and downregulation of the pro-apoptotic protein Bax and matrix metallopeptidase 9 (MMP9) [41].
Studies in levodopa-induced dyskinesia revealed that CA was capable of alleviating the detrimental effects of excessive levodopa through the attenuation of apoptotic cell death via the modulation of ERK1/2-c-Jun and induction of parkin [42]. It also attenuated inflammation, mitochondrial damage, and oxidative stress in isoflurane-treated neuronal cells through the activation of the AMPK/SIRT1 pathway [43]. CA has also been shown to exert anti-inflammatory responses in bone-marrow-derived macrophages through the modulation of the toll-like receptor 2 (TLR2) and MAPK/NF-κB signaling pathway, resulting in a decreased expression of TNF-α, IL-6, and IL-1β [44]. The anti-inflammatory response of CA was further demonstrated via an integrated proteomic and bioinformatic study that demonstrated the involvement of CA in the modulation of multiple inflammatory processes, including MAPK, NF-κB, and FoxO signaling pathways [45]. CA also inhibits the nucleotide-binding oligomerization domain-like receptor containing pyrin domain 3 (NLRP3) inflammasome, which plays a critical role in the pathogenesis of neurodegenerative disorders, including AD and PD and COVID-19, including ‘long-COVID’, thereby representing its therapeutic potential [46]. Additionally, its neuroprotective role in the prevention of prion protein (PrP) aggregation in cellular models as well as disruption of PrP aggregates in cell-free assays [47], raises interesting possibilities for considering CA as a potential adjuvant candidate against prion diseases, including Creutzfeldt–Jakob disease (CJD), Gerstmann–Straussler–Scheinker disease (GSS), and fatal familial insomnia (FFI).
Collectively, these studies demonstrate the cytoprotective characteristics afforded by CA and support its use as both a prophylactic and a neuroprotective compound that warrants continued investigation in diseases of the nervous system (summarized in Table 1).
Table 1. Neuroprotective effects of carnosic acid and its associated mechanisms of action.
Neuroprotective Effects Mechanisms
Induction of autophagy Activation of AMP-activated protein kinase (AMPK) [5]
Phosphorylation of protein kinase B (Akt) and extracellular signal-regulated kinase 1/2 (Erk1/2) [6][42]
Induction of Parkin pathway [11][42]
Enhancement of parkin/Beclin1 interaction [13]
Activation of the PINK1/parkin/mitophagy pathway [14]
Activation of the parkin/IKKγ/p65 pathway [15][16]
Alleviation of oxidative stress Induction of Nrf2-ARE response [48][49][50][51][52][53][54][55][56][57][58][59][60][61]
Activation of the PI3K/Akt signaling pathway [21][62][63][64][65]
Attenuation of apoptosis Repression of apoptosis-related caspase-3 and -12 and c-Jun N-terminal kinase (JNK) [23][66]
Attenuation of BDNF downregulation [23]
Restoration of Bcl-2/Bax ratio [19]
Activation of the PKA/CREB pathway [66]
Amelioration of the induction of ARTS and reduction of XIAP [67]
Activation of SIRT1/p66shc signaling pathway [24]
Protection against Aβ-mediated neurodegeneration Upregulation of tumor necrosis factor-α-converting enzyme (TACE) mRNA to suppress Aβ42 generation [33][34]
Inhibition of NMDAR subtype 2B (NMDAR2B) receptor phosphorylation [35]
Restoration of cognitive impairment [37][38]
Suppression of Aβ-induced cholinergic and mitochondrial dysfunction [39]
Inhibition of the CCAAT-enhancer-binding protein β (CEBPβ)-NFκB signaling pathway [40]
Suppression of Apolipoprotein E e4 (ApoE e4)-associated AD [68]
Protective role in models of neuronal injury Suppression of various pro-inflammatory cytokines [41]
Activation of AMPK/SIRT1 pathway [43]
Modulation of the toll-like receptor 2 (TLR2), MAPK/NF-κB, and FoxO signaling pathway [44][45]
Inhibition of the nucleotide-binding oligomerization domain-like receptor containing pyrin domain 3 (NLRP3) inflammasome [46]
Prevention of prion protein (PrP) aggregation [47]

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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 :
Fatima Javed Mirza
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Saadia Zahid
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R. M. Damian Holsinger
View Times: 453
Entry Collection: Neurodegeneration
Revisions: 2 times (View History)
Update Date: 27 Mar 2023
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