Assessment of suberoylanilide hydroxamic acid on a Alzheimer's disease model induced by ß-amyloid(1-42) in aged female mice: Neuromodulatory and epigenetic effect.

Alzheimer's disease (AD) is a neurodegenerative disease that affects several elderly people per years. AD is a pathology of multifactorial etiology, resulting from multiple environmental and genetic determinants. However, there is no effective pharmacological alternative for the treatment of this illness. In this sense, the purpose of current study was to characterize the mechanisms by which Aß1-42 injection via intracerebroventricular induces neurobehavioral changes in a time-course curve. In addition, suberoylanilide hydroxamic acid (SAHA) inhibitor of histone deacetylase (HDAC) was used to investigate the involvement of epigenetic modifications Aß1-42-caused in aged female mice. In general manner, Aß1-42 injection induced a major neurochemical disturbance in hippocampus and prefrontal cortex of animals and a serious impairment of memory. Overall, SAHA treatment attenuated neurobehavioral changes caused by Aß1-42 injection in aged female mice. The subchronic effects presented of SAHA were through modulation of HDAC activity, regulation of brain-derived neurotrophic factor (BDNF) levels and expression of BDNF mRNA, accompanied by unlocking cAMP/PKA/pCREB pathway in hippocampus and prefrontal cortex of animals.

Involvement of Indoleamine-2,3-Dioxygenase and Kynurenine Pathway in Experimental Autoimmune Encephalomyelitis in Mice.

The experimental autoimmune encephalomyelitis (EAE) is a model that mimics multiple sclerosis in rodents. Evidence has suggested that the activation of indoleamine-2,3-dioxygenase (IDO), the rate-limiting enzyme in the kynurenine pathway (KP), plays a crucial role in inflammation-related diseases. The present study aimed to investigate the involvement of the inflammatory process and KP components in a model of EAE in mice. To identify the role of KP in EAE pathogenesis, mice received IDO inhibitor (INCB024360) at a dose of 200 mg/kg (per oral) for 25 days. We demonstrated that IDO inhibitor mitigated the clinical signs of EAE, in parallel with the reduction of cytokine levels (brain, spinal cord, spleen and lymph node) and ionized calcium-binding adaptor protein-1 (Iba-1) gene expression in the central nervous system of EAE mice. Besides, IDO inhibitor causes a significant decrease in the levels of tryptophan, kynurenine and neurotoxic metabolites of KP, such as 3-hydroxykynurenine (3-HK) and quinolinic acid (QUIN) in the prefrontal cortex, hippocampus, spinal cord, spleen and lymph node of EAE mice. The mRNA expression and enzyme activity of IDO and kynurenine 3-monooxygenase (KMO) were also reduced by IDO inhibitor. These findings indicate that the inflammatory process concomitant with the activation of IDO/KP is involved in the pathogenic mechanisms of EAE. The modulation of KP is a promising target for novel pharmacological treatment of MS.

Involvement of kynurenine pathway in depressive-like behaviour induced by nandrolone decanoate in mice.

Nandrolone decanoate (ND) belongs to the class II of anabolic-androgenic steroids (AAS), which is composed of 19-nor-testosterone-derivatives. AAS represent a group of synthetic testosterone that is used in clinical treatment. However, these drugs are widely abused among individuals as a means of promoting muscle growth or enhancing athletic performance. AAS in general and ND in particular have been associated with several behavioral disturbances, such as anxiety, aggressiveness and depression. A factor that contributes to the development of depression is the brain activation of indoleamine 2,3-dioxygenase (IDO), the rate-limiting enzyme of kynurenine pathway (KP). In the present study, we examined the involvement of KP in depressive phenotype induced by a ND treatment (10 mg/kg/day/s.c., for 28 days) that mimics human abuse system (e.g. supraphysiological doses) in C57B/6J mice. Our results showed that ND caused depressive like-behavior in the tail suspension test and anhedonic-like state measured in the sucrose preference test. ND administration decreased the levels of brain-derived neurotrophic factor and neurotrophin-3 and reduced Na+,K+-ATPase activity in the hippocampus, striatum and prefrontal cortex. We also found that ND elicited KP activation, as reflected by the increase of IDO activity and kynurenine levels in these brain regions. Moreover, ND decreased serotonin levels and increased 5-hydroxyindoleacetic acid levels in the brain. Treatment with IDO inhibitor 1-methyl-dl-trypthophan (1 mg/kg/i.p.) reversed the behavioral and neurochemical alterations induced by ND. These results indicate for the first time that KP plays a key role in depressive-like behavior and neurotoxicity induced by supraphysiologicaldoses of ND in mice.

ORY supplementation mitigates acetaminophen-induced acute liver failure in male mice: role of oxidative stress and apoptotic markers.

The aim of the present study was to assess the possible protective effect of γ-oryzanol (ORY) supplementation in a model of acute liver failure (ALF) induced by acetaminophen (APAP) in mice. Male Swiss strain mice were supplemented with ORY (10 and 50 mg/kg, per oral route) daily for 7 days. One hour after the last supplementation, animals received APAP (300 mg/kg, intraperitoneal). Twenty-four hours after APAP administration, mice were euthanized, and biochemical and histopathological determinations were performed. Histopathological analysis revealed that APAP caused vascular congestion, loss of cellular structure, and cellular infiltration in hepatocytes. Moreover, it caused oxidative damage (enzymatic and non-enzymatic analysis of oxidative stress), with loss of hepatic function leading to cell apoptosis (apoptotic parameters). ORY supplementation (ORY-10 and ORY-50) protected against all changes in ALF model. Thus, the protective effect of ORY supplementation was due to modulation of antioxidant defenses avoiding the apoptotic process.

Chrysin loaded lipid-core nanocapsules ameliorates neurobehavioral alterations induced by ß-amyloid1-42 in aged female mice.

Alzheimer's disease (AD) is a neurodegenerative disorder characterized by a clinically and progressive loss of cognitive function, neuropsychiatric and behavioral disorders. Some studies showed that chrysin has antioxidant and anti-inflammatory properties. However, your bioavailability is relatively low. Therefore, the present study was designed to investigate the effects of chrysin loaded lipid-core nanocapsules (LNCs) on neurochemical and behavioral changes in a model of AD induced by ß-amyloid1-42 (Aß1-42) peptide in aged female mice. For this purpose, aged female mice received free chrysin (FC) (5 mg/kg, per oral, p.o.) or chrysin loaded LNCs (C1-LNC and C5-LNC) (1 or 5 mg/kg, p.o.) for 14 days after Aß1-42 administration (400 pmol, i.c.v.). Aß1-42 induced significant impairments on memory and learning (morris water maze task, object recognition and step-down-type passive avoidance), also caused oxidative stress, reduced the levels of brain-derived neurotrophic factor (BDNF), increased neuroinflammation in prefrontal cortex and hippocampus of aged animals. Thus, C1-LNC and C5-LNC displayed significant effect against Aß1-42, via attenuation of oxidative stress and neuroinflammation, modulation of neurochemical and behavioral changes in a model of AD. These results point to chrysin loaded LNCs (mainly C5-LNC) can be a promising biomedical tool and a new therapeutic approach for treatment and prevention of AD.

Chrysin suppress immune responses and protects from experimental autoimmune encephalomyelitis in mice.

We investigated the effects of chrysin in the experimental autoimmune encephomyelitis (EAE), a multiple sclerosis (MS) animal model. EAE was induced using myelin oligodendrocyte glycoprotein (MOG) 35-55 peptide in C57BL/6 mice. Chrysin reduced weight loss, attenuated clinical signs and blunted the EAE-induced increase in histone deacetylase (HDCA) activity, glycogen synthase kinase-3ß (GSK-3ß) levels and pro-inflammatory cytokine levels as well as in the EAE-induced decrease in histone acetyltransferases 3 and 4 (HAT3, HAT4). Altogether, results demonstrate beneficial effects and potential targets of chrysin in EAE.

Neuroprotective effects of curcumin lipid-core nanocapsules in a model Alzheimer's disease induced by ß-amyloid 1-42 peptide in aged female mice.

Alzheimer's disease (AD) is a progressive neurodegenerative disease and the most common form of dementia, representing about 60-70% of cases. Curcumin is a natural compound extracted from Curcuma longa Linn, widely used in cooking, presenting several biological activities, including neuroprotection. However, it has low solubility and consequently its bioavailability is limited. In recent years, researchers have focused their attention on delivery systems based on nanotechnology because of their promising potential and advantages over conventional approaches. This study investigated the neuroprotective effects of curcumin loaded lipid-core nanocapsules (LNC) in a model of Alzheimer's disease (AD) induced by intracerebroventricular injections of ß-amyloid1-42 (Aß1-42) peptide in aged female mice, and compared these effects with those from free curcumin. Aged female mice received curcumin, free (50 mg/kg, p.o.) or loaded nanocapsules (10 or 1 mg/kg, p.o.) for 14 days after Aß1-42 administration. Aß1-42 induced significant cognitive deficit (Morris Water Maze test), as well as caused increased the levels of inflammatory cytokines in prefrontal cortex, hippocampus and serum of mice. LNC displayed significant neuroprotection against Aß1-42-induced behavioral and neurochemical changes in a model of AD. These results provide insights into the neuroprotective actions of curcumin and its nanoencapsulation as a promising approach for application as an neuroprotective agent in the prevention of AD.

Blackberry juice anthocyanidins limit cisplatin-induced renal pathophysiology in mice.

Some studies have showed that intake of blackberry juice (BBJ) can prevent urinary tract infections. However, there is a lack of studies that evaluate the mechanisms by which BBJ has protective effect. Thus, the aim of current study was to evaluate the effects of BBJ supplementation on cisplatin-induced renal pathophysiology in mice. Mice were supplemented with BBJ (10 mL/kg) for seven days. One hour after the last supplementation with BBJ, mice received cisplatin (10 mg/kg, i.p.). Seventy-two hours after cisplatin administration, blood was collected and biochemical analysis were performed (urea and creatinine), kidney was dissected and utilized in histological and oxidative evaluations. Cisplatin caused severe injury in renal tissue, in markers of renal damage (urea and creatinine) generated increased of plasmatic levels. Besides that, the cisplatin induced decreased of enzymes activities in renal tissue (superoxide dismutase, glutathione S-transferase and catalase). In contrast, BBJ supplementation protected against histopathological alterations through decreased in urea and creatinine levels and modulation of catalase enzyme activity. Thus, BBJ supplementation protected the renal system of mice from deleterious effects. We suggest that high concentrations of Cyanidin 3-O-glucoside and Cyanidin 3-O-rutinoside are responsible for antioxidant role of BBJ supplementation in renal pathophysiology induced by cisplatin exposure. Also, these results reinforcing the importance of including BBJ in the human diet aimed at preventing renal diseases.

Chrysin protects against behavioral, cognitive and neurochemical alterations in a 6-hydroxydopamine model of Parkinson's disease.

Parkinson's disease (PD) is an age-related neurodegenerative disorder that severely affects quality of life of patients and their families. The flavonoid chrysin (5,7-dihydroxylflavone) is a naturally occurring flavone with several pharmacological activities, including anti-inflammatory and anti-oxidative. We investigated the effects of a 28-day chrysin treatment (10 mg/kg/day, i.g.) on a model of PD induced by 6-OHDA in aged (20-month old) mice. We found a protective effect of chrysin on behavioral and cognitive alterations (rotational behavior, passive avoidance and Barnes maze tests), nitric oxide synthesis (NOx), lipid peroxidation (HNE), glutathione levels (GSH), reactive species levels (RS), neuroinflammation (interleukin-1 beta - IL-1ß and tumor necrosis factor alpha - TNF-α), Na+, K+-ATPase and nicotinamide adenine dinucleotide phosphate oxidase activity (NADPH oxidase) activities. In addition, chrysin protected against changes in striatal dopamine (DA), 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) levels. In conclusion, chrysin improved several behavioral, cognitive and neurochemical parameters in a relevant preclinical model of PD in aged mice.

The flavonoid chrysin protects against zearalenone induced reproductive toxicity in male mice.

The mycotoxin zearalenone (ZEA) has strong estrogenic effects and elicits reproductive toxicity. Chrysin is a natural flavonoid found in many plant and has a broad range of pharmacological activities, including anticancer, antioxidant and anti-inflammatory. The present study aimed to investigate the potential protective effects of chrysin against ZEA toxicity. Mice received chrysin (5 or 20 mg/kg; i.g.) for ten days, and then received a single injection of ZEA (40 mg/kg). Two days thereafter, blood and testes were collected. ZEA decreased number and motility of sperm, plasma testosterone levels, enzymatic (glutathione peroxidase, glutathione reductase, glutathione-S-transferase) and non-enzimatic defenses (reduced glutathione). Moreover, ZEA increased 4-hydroxynonenal and 8-hydroxy-2'-deoxyguanosine levels, myeloperoxidase activity and levels of proinflammatory cytokines (interleukins-1ß and 6, tumor necrosis factor alpha). ZEA also decreased levels of anti-inflammatory cytokine interleukin-10 and increased activity of caspases 3 and 9. Chrysin treatment increased the number and motility of sperm, testosterone levels, restored antioxidant defenses and reduced the inflammation and apoptosis process. In summary, chrysin attenuated the toxic effects caused by ZEA in blood and testes of mice, suggesting a potential preventive treatment against the deleterious effects of ZEA.

Dietary hydrogenated vegetable fat exacerbates the activation of kynurenine pathway caused by peripheral lipopolysaccharide immune challenge in aged mice.

Sickness behavior is a normal immune response of body to fight infection, accompanied by endocrine and behavioral alterations. Lipopolysaccharide (LPS) causes sickness behavior in rodents through the increase of proinflammatory cytokines, generating peripheral inflammation and thus overactivation of kynurenine pathway (KP). In the present study we investigated the effects of dietary hydrogenated vegetable fat (HVF) in sickness behavior induced by LPS in aged mice. Male C57BJ/6 aged mice received a supplementation with HVF for six months. After HVF supplementation mice were treated with LPS (0.15 mg/kg; i. p. injection). Twenty-four hours post LPS injection mice were submitted to behavioral tests and then, the hippocampus, striatum and prefrontal cortex were removed for neurochemical determinations. Our results showed that dietary HVF did not exacerbate the behavioral alterations induced by LPS. Although HVF did not modulate the proinflammatory cytokines analyzed, it caused a potentiation in the increase of brain tumor necrosis factor-alpha levels induced by LPS. Moreover, dietary HVF aggravated LPS-induced KP activation in the brain of mice, mainly by further increase of neurotoxic metabolite quinolinic acid and further decrease of kynurenic acid/kynurenine ratio, a marker of neuroprotective branch of KP. Overall, our study demonstrated that dietary HVF did not worsen the sickness behavioral induced by LPS administration. However, HVF aggravated the activation of KP and exacerbated the shift of KP metabolism towards the neurotoxic branch.

Fish oil ameliorates sickness behavior induced by lipopolysaccharide in aged mice through the modulation of kynurenine pathway.

Sickness behavior is an expression of a central motivational state triggered by activation of the immune system, being considered a strategy of the organism to fight infection. Sickness behavior is induced by peripheral administration of lipopolysaccharide (LPS). LPS can increase the levels of proinflammatory cytokines, which induce the activation of the kynurenine pathway (KP) and behavioral alterations. Previous studies have shown that omega-3 (n-3) polyunsaturated fatty acid (PUFA) has anti-inflammatory properties. Because of this, the purpose of the present study was to evaluate the protective effect of fish oil (FO) supplementation against LPS-induced sickness behavior in aged mice with respect to anhedonia, locomotor activity and body weight. Moreover, we evaluated the ability of FO treatment on the regulation of neuroinflammation (levels of interleukin-1ß, interleukin-6, tumor factor necrosis-α and interferon-γ), KP biomarkers (levels of tryptophan, kynurenine, kynurenic acid, 3-hydroxykynurenine and quinolinic acid and activities of indoleamine-2,3-dioxygenase, kynurenine monooxygenase and kynurenine aminotransferase) and serotonergic system (levels of serotonin and 5-hydroxyindoleactic acid) in the hippocampus, striatum and prefrontal cortex of LPS-treated mice. We found that FO prevented the LPS-mediated body weight loss, anhedonic behavior, reduction of locomotor activity, up-regulation of the proinflammatory cytokines and serotoninergic alterations. We also found that FO was effective in modulating the KP biomarkers, inhibiting or attenuating KP dysregulation induced by LPS. Together, our results indicated that FO may have beneficial effects on LPS induced sickness-behavior in aged mice either by modulating central inflammation, KP and serotonergic signaling (indirectly effect) or by fatty acids incorporation into neuronal membranes (direct effect).

Chrysin reverses the depressive-like behavior induced by hypothyroidism in female mice by regulating hippocampal serotonin and dopamine.

Hypothyroidism is often associated with psychiatric disorders such as depression. In this study, we evaluated the effect of chrysin on depressive-like behavior and monoamine levels in hypothyroid female mice. Hypothyroidism was induced by continuous exposure to 0.1% methimazole (MTZ) in drinking water for 31 days. Exposure to MTZ was associated with low plasma levels of thyroid hormones T3 and T4 compared with the control group. Subsequently, euthyroid and MTZ-induced hypothyroid mice were intragastrically administered vehicle or chrysin (20mg/kg) once a day for 28 consecutive days. After treatments, the following behavioral assessments were performed: Open-Field Test (OFT), Tail suspension test (TST), and Forced Swimming Test (FST). Additionally, T3 and T4 levels were measured again, and serotonin (5HT), dopamine, and noradrenaline levels were analyzed in the prefrontal cortex and the hippocampus. Chrysin treatment could not reverse T3 and T4 levels. Hypothyroid mice showed an increased immobility time in TST and FST; chrysin treatment reversed these effects. Reduced levels of 5HT and dopamine in the prefrontal cortex and the hippocampus were observed in the hypothyroid mice than in the euthyroid mice. Chrysin treatment recovered 5HT content in both structures and dopamine content only in the hippocampus. Noradrenaline content was not altered by treatments. Together, our results have demonstrated that chrysin treatment reverses depressive-like behaviors in hypothyroid female mice and suggests the involvement of 5HT and dopamine in these effects.

Hesperidin attenuates iron-induced oxidative damage and dopamine depletion in Drosophila melanogaster model of Parkinson's disease.

This study has evaluated the action of flavonoid hesperidin on the neurotoxic effects caused by the intake of iron (Fe) in Drosophila melanogaster. Male adult flies, aged 1-3 days, have been divided into four groups of 50 each: (1) control, (2) Hsd 10 µM, (3) Fe 20 mM (4) Hsd 10 µM + Fe 20 mM. During the exposure protocol, the flies have been exposed to a diet containing Hsd and/or Fe for 48 h. The survival and behavioral analyses have been carried out in vivo, and ex vivo. The analyses involved acetylcholinesterase (AChE) activity and Fe levels in the flies' heads and bodies and determination of dopaminergic levels, cellular and mitochondrial viability, activities of superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), reactive species levels (RS), thiobarbituric acid reactive substances (TBARS) and contents of total thiols and non-proteic thiols (NPSH) in the flies' heads. A significant negative correlation between Fe levels in the head of the flies and the survival, dopamine levels and antioxidant enzymes in the head of the flies has been found. Additionally, significant positive correlation between Fe levels in the head of the flies with negative geotaxis RS and AChE activity in the head of the flies has been found. It demonstrates that the flies which had higher levels of Fe in their heads have demonstrated more susceptibility to neurotoxicity. An important result from our study is that Hsd treatment promotes a decrease in Fe concentration in the head, restores dopamine levels and cholinergic activity of the flies and improves motor function caused by Fe. Hsd also ameliorates Fe induced mortality, oxidative stress and mitochondrial dysfunction. Our results have demonstrated the neuroprotective effect of Hsd and it suggests that flavonoid acts in different ways to protect against the Parkinson disease caused by Fe exposure such as the direct scavenging of RS and activation of antioxidant enzymes.

Anti-Inflammatory and Anti-Oxidant Effects of p-Chloro-phenyl-selenoesterol on TNBS-Induced Inflammatory Bowel Disease in Mice.

This study aims to investigate the protective effect of p-chloro-phenyl-selenoesterol [PCS; 0,2 mg/kg; 10 ml/kg i.g.) in colitis induced by 2,4,6-trinitrobenzene sulfonic acid [TNBS; 2 mg/100 µl 50% ethanol; intrarectally) in mice. Several parameters including weight, length, histological analyses determination, thiobarbituric acid reactive species, reactive species levels, superoxide dismutase, catalase, and myeloperoxidase (MPO) activity of colon were evaluated. The serum levels of tumor necrosis factor alpha [TNF-α) and interleukin 6 [IL-6) were also assessed. Treatment with PCS reduced the clinical and histopathologic severity of TNBS-induced colitis, characterized by colon length reduction and increased colon weight and microscopic intestinal inflammation. The therapeutic effects of PCS in this model were associated with significant decrease in proinflammatory cytokines TNF-α and IL-6 and decrease in MPO activity. Furthermore, combined with improvements in inflammatory parameters, treatment with the PCS was able to decrease oxidative stress and to prevent the decrease in antioxidant defenses in animals with TNBS-induced colitis. This finding suggests that PCS can improve experimental colitis in mice and it could be a potential therapeutic agent for the treatment of patients with IBD. J. Cell. Biochem. 118: 709-717, 2017. © 2016 Wiley Periodicals, Inc.

Chrysin promotes attenuation of depressive-like behavior and hippocampal dysfunction resulting from olfactory bulbectomy in mice.

Chrysin is a natural flavonoid which is found in bee propolis, honey and various plants, and antidepressant-like effect of chrysin in chronically stressed mice was previously demonstrated by our group. In this work, we investigated the action of chrysin treatment (5 or 20 mg/kg) for 14 days in the depressant-like behavior and in the hippocampal dysfunction induced by olfactory bulbectomy (OB), an animal model of agitated depression. Results demonstrated that OB occasioned a depressant-like behavior in the splash test, open field test and forced swimming test. Chrysin administration, similarly to fluoxetine (positive control), promoted the attenuation of these behavioral modifications. OB also caused the elevation of tumor necrosis factor-α, interferon-γ, interleukin-1ß, interleukin-6, kynurenine (KYN) levels and indoleamine-2,3-dioxygenase activity, as well as occasioned the decrease of 5-hydroxytryptamine (5-HT) and brain-derived neurotrophic factor (BDNF) levels and increase KYN/tryptophan and 5-hydroxyindoleacetic acid/5-HT ratio in the hippocampus. Chrysin therapy prevented against all these alterations in the hippocampus. In addition, chrysin treatment (20 mg/kg) resulted in the up-regulation of BDNF levels in the control animals, reinforcing our hypothesis that up-regulation of BDNF synthesis play a key role in the antidepressant action of chrysin. In conclusion, this study showed that chrysin, similarly to fluoxetine, is capable of promoting the attenuation of depressant-like behavior and hippocampal dysfunction resulting from OB in mice. These results reinforced the potential of chrysin for the treatment or supplementary treatment of depression, as well as showed that chrysin is also effective with 14 days of therapy in a model of agitated depression.

Neurochemical factors associated with the antidepressant-like effect of flavonoid chrysin in chronically stressed mice.

Chrysin is a flavonoid which is found in bee propolis, honey and various plants. Antidepressant-like effect of chrysin in chronically stressed mice was previously demonstrated by our group. Conversely, neurochemical factors associated with this effect require further investigations. Thus, we investigated the possible involvement of pro-inflammatory cytokines, kynurenine pathway (KP), 5-hydroxytryptamine (5-HT) metabolism and caspases activities in the effect of chrysin in mice exposed to unpredictable chronic stress (UCS). UCS applied for 28 days induced a depressive-like behavior, characterized by decrease in the time of grooming in the splash test and by increase in the immobility time in the tail suspension test. Oral treatment with chrysin (5 or 20mg/kg, 28 days), similarly to fluoxetine (10mg/kg, positive control), culminated in the prevention of these alterations. UCS elevated plasma levels of corticotropin-releasing hormone and adrenocorticotropic hormone, as well the tumor necrosis factor-α, interleukin-1ß, interleukin-6 and kynurenine levels in the prefrontal cortex (PFC) and hippocampus (HP). UCS induced the decrease in the 5-HT levels in the HP and the increase in the indoleamine-2,3-dioxygenase, caspase 3 and 9 activities in the PFC and HP. Treatment with chrysin, similarly to fluoxetine, promoted the attenuation of these alterations occasioned by UCS. These results corroborated with the antidepressant potential of chrysin in the treatment of psychiatric diseases. Furthermore, this work indicated the association of pro-inflammatory cytokines synthesis, KP, 5-HT metabolism and caspases activities with the action exercised by chrysin in mice exposed to UCS.

High-Fat Diet Induces Oxidative Stress and MPK2 and HSP83 Gene Expression in Drosophila melanogaster.

The consumption of a high-fat diet (HFD) causes alteration in normal metabolism affecting lifespan of flies; however molecular mechanism associated with this damage in flies is not well known. This study evaluates the effects of ingestion of a diet supplemented with 10% and 20% of coconut oil, which is rich in saturated fatty acids, on oxidative stress and cells stress signaling pathways. After exposure to the diet for seven days, cellular and mitochondrial viability, lipid peroxidation and antioxidant enzymes SOD and CAT activity, and mRNA expression of antioxidant enzymes HSP83 and MPK2 were analyzed. To confirm the damage effect of diet on flies, survival and lifespan were investigated. The results revealed that the HFD augmented the rate of lipid peroxidation and SOD and CAT activity and induced a higher expression of HSP83 and MPK2 mRNA. In parallel, levels of enzymes involved in lipid metabolism (ACSL1 and ACeCS1) were increased. Our data demonstrate that association among metabolic changes, oxidative stress, and protein signalization might be involved in shortening the lifespan of flies fed with a HFD.

Effectiveness of γ-oryzanol in reducing neuromotor deficits, dopamine depletion and oxidative stress in a Drosophila melanogaster model of Parkinson's disease induced by rotenone.

The γ-orizanol present in rice bran oil contains a mix of steryl triterpenyl esters of ferulic acid, which is believed to be linked to its antioxidant potential. In this study we investigated the neuroprotective actions of γ-orizanol (ORY) against the toxicity induced by rotenone (ROT) in Drosophila melanogaster. The flies (both genders) aged between 1 and 5 days old were divided into four groups of 50 flies each: (1) control, (2) ORY 25 µM, (3) ROT 500 µM, (4) ORY 25 µM+ROT 500 µM. Flies were concomitantly exposed to a diet containing ROT and ORY for 7 days according to their respective groups. Survival and behavior analyses were carried out in vivo, and ex vivo analyses involved acetylcholinesterase activity (AChE), determination of dopaminergic levels, cellular viability and mitochondrial viability, activities of superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), reactive species levels (RS), lipid peroxidation (TBARS) and contents of total thiols and non-proteic thiols (NPSH). Our results show for the first time that ORY not only acts as an endogenous activator of the cellular antioxidant defenses, but it also ameliorates rotenone induced mortality, oxidative stress and mitochondrial dysfunction. Our salient findings regarded the restoration of cholinergic deficits, dopamine levels and improved motor function provided by ORY. These results demonstrate the neuroprotective potential of ORY and that this effect can be potentially due to its antioxidant action. In conclusion, the present results show that ORY is effective in reducing the ROT induced toxicity in D. melanogaster, which showed a neuroprotective action, possibly due to the presence of the antioxidant constituents such as the ferulic acid.

Evidence for the Involvement of Potassium Channel Inhibition in the Antidepressant-Like Effects of Hesperidin in the Tail Suspension Test in Mice.

The administration of hesperidin elicits an antidepressant-like effect in mice by a mechanism dependent on an interaction with the L-arginine-nitric oxide (NO)-cyclic guanosine monophosphate (cGMP) pathway, whose stimulation is associated with the activation of potassium (K(+)) channels. Thus, this study investigated the involvement of different types of K(+) channels in the antidepressant-like effect of hesperidin in the mice tail suspension test (TST). The intracerebroventricular administration of tetraethylammonium (TEA, a nonspecific blocker of K(+) channels), glibenclamide (an ATP-sensitive K(+) channel blocker), charybdotoxin (a large- and intermediate-conductance calcium-activated K(+) channel blocker) or apamin (a small-conductance calcium-activated K(+) channel blocker) combined with a subeffective dose of hesperidin (0.01 mg/kg, intraperitoneally [i.p.]) was able to produce a synergistic antidepressant-like effect in the mice TST. Moreover, the antidepressant-like effect elicited by an effective dose of hesperidin (0.3 mg/kg, i.p.) in TST was abolished by the treatment of mice with pharmacological compounds K(+) channel openers (cromakalim and minoxidil). Results showed that the antidepressant-like effect of hesperidin in TST may involve, at least in part, the modulation of neuronal excitability through inhibition of K(+) channels and may act through a mechanism dependent on the inhibition of L-arginine-NO pathway.