Hesperidin Protects Alcohol-Induced Mitochondrial Abnormalities via the Inhibition of Oxidative Stress and MPT Pore Opening in Newborn Male Rats as a Fetal Alcohol Syndrome Model.

OBJECTIVE: Prenatal alcohol exposure causes fetal developmental abnormalities via mitochondrial dysfunction, reactive oxygen species (ROS) formation, and oxidative stress. Therefore, we aimed to investigate the potential of hesperidin as a mitochondrial protective and antioxidative agent in newborn male rats as a model for fetal alcohol syndrome (FAS). METHOD: Newborn male rats were divided randomly into five groups: a sham group (receiving 27.8 ml/ kg milk solution, orally), an ethanol group (5.25 g/kg in milk solution, orally, 2-10 days after birth), an ethanol + hesperidin group (25 mg/kg/ day orally), an ethanol + hesperidin group (50 mg/kg/day orally), and an ethanol + hesperidin group (100 mg/kg/day orally). Thirty-six days after birth, newborn male rats were sacrificed and brain mitochondria were isolated using differential centrifugation. Mitochondrial toxicity biomarkers of succinate dehydrogenase (SDH) activity, mitochondrial swelling, mitochondrial membrane potential (MMP), and ROS were measured. RESULTS: Offspring neonatally exposed to ethanol showed a significant reduction in SDH activity, mitochondrial swelling, MMP collapse, induction of ROS formation, and lipid peroxidation in isolated mitochondria. Oral administration of hesperidin restored SDH activity, improved MMP collapse and mitochondrial swelling, and reduced ROS formation. CONCLUSIONS: This study demonstrates that hesperidin exerts a potent protective effect against alcohol-induced mitochondrial toxicity in the FAS model. Moreover, these findings indicate that hesperidin might be a useful compound for prevention of alcohol-induced fetal developmental abnormalities during pregnancy.

Neuroprotective Effects of Berberine Hydrochloride on Methamphetamine-induced Cognitive Dysfunction: Immunohistochemical and Behavioral Studies in Rats.

Introduction: Methamphetamine (MA) as an addictive psychostimulant drug affects the central nervous system. The current research aimed to evaluate the impact of berberine hydrochloride on improving cognitive function and neuroprotective effects in rats addicted to MA. Methods: In this study, 27 male Wistar rats were randomly assigned to three groups, including control, MA addiction, and MA addiction with berberine hydrochloride (100 mg/kg/d) orally during the three weeks of withdrawal. Two groups received self-administered inhaled MA for two weeks (up to 10 mg/kg). Following the experimental procedures, a Morris water maze (MWM) and shuttle box were used to assess memory, and hippocampal sections from the animals were examined for caspase-3, Ki-67, and glial fibrillary acidic protein (GFAP) expression. Results: The obtained results from the Morris water maze (MWM) showed that berberine hydrochloride decreases (P<0.01) the distance moved and the time spent to reach the hidden platform in the four-day learning trails phase and significant differences were observed in the distance moved, spent time, and frequency of motion in target quadrant on probe test day between groups. Berberine hydrochloride also reduced the latency of animals entering the dark chamber in the treated group compared to the control group (P<0.05). A significant decrease in activation of caspases-3, higher percentages of Ki-67 expression, and an increase in glial fibrillary acidic protein (GFAP) expression of cells was observed in the addicted group compared to the berberine-treated and control groups (P<0.05). Conclusion: Administration of berberine hydrochloride for 3 weeks improves cognitive function in MA addiction and it has potential neuroprotective efficacy. Highlights: Methamphetamine (MA) as an addictive psychostimulant drug affects the central nervous system.The berberine hydrochloride effects on improving cognitive function and neuroprotective.No approved pharmacotherapy, as well as confirmed medication, is available to treat MA abuse. Plain Language Summary: Methamphetamine (MA) is known as a strong addictive stimulant with high addiction and no approved pharmaco-therapy, as well as confirmed medication, is available to treat MA abuse. The study on the long-term effect of MA exposure on cognitive function during an object recognition memory test showed cognitive dysfunction after MA exposure. Berberine can reduce induced amnesia, which can be due to the increased peripheral and central cholinergic neuronal system functions, in addition, the most important mechanism in the protective effect of berberine against amnesia is the inhabitation of inflammation; however, the berberine impact on cells should be more investigated.

Erythropoietin improve spatial memory impairment following methamphetamine neurotoxicity by inhibition of apoptosis, oxidative stress and neuroinflammation in CA1 area of hippocampus.

OBJECTIVE: Methamphetamine (METH) is one of the most widely used addictive drugs, and addiction to it is on the rise all over the world. METH abuse has long-term damaging effects that reduce memory and impair cognitive functions. According to studies, the observed effects are strongly related to the nerve cell damage caused by METH, which leads to neurotoxicity. Some of these intra-neuronal events include dopamine oxidation, excitotoxicity, and oxidative stress. Erythropoietin (EPO) is a hormone produced primarily by the kidneys and, in small quantities, by the liver. Studies have shown that EPO exhibits considerable neuroprotective effects. This study aimed to investigate the protective effects of EPO on METH neurotoxicity. METHODS: Initially, 48 male Wistar rats, weighing 250-300 g, were randomly assigned to four groups: control (n = 12), METH (n = 12), and METH+EPO (2500, 5000 IU/kg/IP- n = 12). METH was injected intraperitoneally at a dose of 40 mg per kg of body weight (four injections of 10 mg every two hours) to induce neurotoxicity. EPO was injected at doses of 2500 and 5000 IU/kg seven days after the last METH administration (ip). Morris water maze test was performed following EPO injection (1 day after the last dose) to assess spatial memory. The brains were removed after the behavioral test, biochemical evaluations and immunohistochemistry (caspase-3 and GFAP) was performed. RESULTS: The results showed that EPO treatment significantly improved spatial memory impairment (P < 0.01), compared to the METH group, EPO was a significant reduction in malondialdehyde and TNF-α (P < 0.01), as well as an increase in superoxide dismutase (P < 0.05) and glutathione-PX (P < 0.01). Furthermore, EPO treatment significantly reduced the number of GFAP positive cells (P < 0.01) and caspase 3 (P < 0.001) in the hippocampus (CA1 region). CONCLUSIONS: The study findings suggested that EPO may have great neuroprotective effects on METH neurotoxicity due to its anti-inflammatory, antioxidant, and antiapoptotic properties.

Anti-inflammatory, Antioxidant, and Antiapoptotic Action of Metformin Attenuates Ethanol Neurotoxicity in the Animal Model of Fetal Alcohol Spectrum Disorders.

Fetal alcohol exposure has permanent effects on the brain structure, leading to functional deficits in several aspects of behavior, including learning and memory. Alcohol-induced neurocognitive impairment in offsprings is included with activation of oxidative- inflammatory cascade followed with wide apoptotic neurodegeneration in several brain areas, such as the hippocampus. Metformin is the first-line treatment for diabetic patients. It rapidly crosses the blood-brain barrier (BBB) and exerts antioxidant, anti-inflammatory, and neuroprotective effects. In this study, we evaluated the protective effects of metformin on ethanol-related neuroinflammation, as well as neuron apoptosis in the hippocampus of adult male rat in animal model of fetal alcohol spectrum disorders. Treatment with ethanol in milk solution (5.25 and 27.8 g/kg, respectively) was conducted by intragastric intubation at 2-10 days after birth. To examine the antioxidant and anti-inflammatory properties of metformin, an ELISA assay was performed for determining the tumor necrosis factor-α (TNF-α) and antioxidant enzyme concentrations. Immunohistochemical staining was conducted for evaluating the glial fibrillary acidic protein (GFAP) and cleaved caspase-3 expression. Based on the results, metformin caused a significant increase in the superoxide dismutase (SOD) (P < 0.05) and glutathione peroxidase (GSH-Px) (P < 0.01) activities. On the other hand, it reduced the concentrations of TNF-α and malondialdehyde, compared to the ethanol group (P < 0.01). In the metformin group, there was a reduction in cell apoptosis in the hippocampus, as well as GFAP-positive cells (P < 0.01). Overall, apoptotic signaling, regulated by the oxidative inflammatory cascade, can be suppressed by metformin in adult brain rats following animal model of fetal alcohol spectrum disorders.

Neuroprotective Effects of Crocin Against Ethanol Neurotoxicity in the Animal Model of Fetal Alcohol Spectrum Disorders.

Several experimental and clinical findings suggest that ethanol consumption during pregnancy activates an oxidative-inflammatory cascade followed by wide apoptotic neurodegeneration within several brain areas, including the hippocampus. Crocin can protect neurons because of its antioxidant, anti-inflammatory, and antiapoptotic effects. This study evaluated the crocin protective impact on ethanol-related neuroinflammation and neuronal apoptosis in the hippocampus of rat pups exposed to alcohol over postnatal days. Ethanol (5.25 g/kg) was administrated in milk solution (27.8 ml/kg) by intragastric intubation 2-10 days after birth. The animals received crocin (15, 30, and 45 mg/kg) 2-10 days after birth. The hippocampus-dependent memory and spatial learning were evaluated 36 days after birth using the Morris water maze task. Further, the concentrations of TNF-α and antioxidant enzymes were determined using ELISA assay to examine the antioxidant and anti-inflammatory activities. Also, immunohistochemical staining was performed to evaluate the glial fibrillary acidic protein (GFAP), Ionized calcium binding adaptor molecule 1(Iba-1), and caspase-3 expression. The administration of crocin significantly attenuated spatial memory impairment (P < 0.01) after ethanol neurotoxicity. Also, crocin led to a significant enhancement in SOD (P < 0.05) and GSH-PX (P < 0.01), whereas it caused a reduction in the TNF-α and MDA concentrations compared to the ethanol group (P < 0.01). Moreover, the hippocampal level of caspase-3 (P < 0.01) and the number of GFAP and Iba-1-positive cells decreased in the crocin group (P < 0.001). Crocin suppresses apoptotic signaling mediated by the oxidative-inflammatory cascade in rat pups exposed to ethanol after birth.

Cyanocobalamin improves memory impairment via inhibition of necrosis and apoptosis of hippocampal cell death after transient global ischemia/reperfusion.

OBJECTIVES: Brain ischemia/reperfusion (I/R) causes irreversible damage, particularly in the hippocampus. Cyanocobalamin (CNCbl) is known to be crucial for the proper operation of the nervous system. Vitamin B12 has been demonstrated to exert antioxidant effects via direct and indirect mechanisms. It can also protect cortical neurons against glutamate cytotoxicity. This research was conducted to examine CNCbl protection against neuronal cell death in the rat hippocampal region following transient cerebral ischemia. MATERIALS AND METHODS: In this experiment, 48 male Wistar rats were selected, which were randomly divided into four groups (n=12 in each group): sham, ischemia/reperfusion, ischemia/reperfusion + CNCbl 200 and 400 (µg/kg). By occlusion of both common carotids, ischemia induction was performed within 20 min. CNCbl at the doses of 200 and 400 µg/kg was injected (IP) at the start of the reperfusion, 24 and 48 hr following reperfusion. The spatial memory was assessed 7 days following ischemia through the Morris water maze test. Antioxidant enzymes, apoptosis, and necrosis were measured after behavioral tests. RESULTS: CNCbl significantly improved spatial memory impairments (P<0.05), also CNCbl therapy significantly increased both glutathione (P<0.01) and superoxide dismutase (P<0.05) and reduced malondialdehyde (P<0.01) and TNF-α (P<0.05) in comparison with the ischemia group. In addition, CNCbl significantly decreased both apoptosis and necrosis in the hippocampus CA1 (P<0.01). CONCLUSION: CNCbl improves memory impairment following ischemia injury by decreasing neuronal cell death via its antioxidant properties.

Curcumin attenuates spatial memory impairment by anti-oxidative, anti-apoptosis, and anti-inflammatory mechanism against methamphetamine neurotoxicity in male Wistar rats: Histological and biochemical changes.

OBJECTIVE: Methamphetamine is used extensively around the world as a psychostimulant. The complications related to methamphetamine include methamphetamine-induced neurotoxicity, mainly involving intraneuronal processes, such as oxidative stress and excitotoxicity. Curcumin is effective against neuronal injury due to its antioxidant, anti-inflammatory effects. In this study, we examined the protective effects of curcumin against methamphetamine neurotoxicity. METHODS: Sixty male Wistar rats were divided into the following groups: control (n = 12), DMSO (n = 12), methamphetamine (n = 12), and methamphetamine + curcumin (100 and 200 mg/kg, respectively, intraperitoneal [IP]; n = 12). Neurotoxicity was induced by 40 mg/kg of methamphetamine administrated through 4 injections (4 × 10 mg/kg, q2h, IP). Curcumin (100 and 200 mg/kg) was administered at 7 days after the last methamphetamine injection. By using a Morris water maze task, the hippocampus-dependent memory and spatial learning were evaluated 1 day after the last curcumin injection. Then, the animal brains were isolated for biochemical measurements, as well as glial fibrillary acidic protein (GFAP), ionized calcium-binding adaptor protein-1(Iba-1) and caspase-3 immunohistochemical staining. RESULTS: The current study demonstrated that administration of curcumin significantly attenuates spatial memory impairment (P < 0.01) following methamphetamine neurotoxicity. Curcumin caused a significant increase in the levels of superoxide dismutase and glutathione peroxidase (P < 0.05). However, it decreased tumor necrosis factor (TNF-α) (P < 0.05) and malondialdehyde (P < 0.01) levels as compared to the methamphetamine group. Also, curcumin significantly reduced Iba-1 (P < 0. 01), GFAP and caspase-3 positive cells in the hippocampus (P < 0.001). CONCLUSION: Curcumin exerted neuroprotective effects on methamphetamine neurotoxicity because of its antioxidant and anti-inflammatory effect.

Apelin-13 attenuates spatial memory impairment by anti-oxidative, anti-apoptosis, and anti-inflammatory mechanism against ethanol neurotoxicity in the neonatal rat hippocampus.

It has been shown that alcohol consumption by pregnant women can have detrimental effects on the developing fetus and lead to fetal alcohol spectrum disorders (FASD). Exposure to alcohol in rat pups during this period causes long-term changes in the structure of the animal's hippocampus, leading to impaired hippocampal-related brain functions such as navigation tasks and spatial memory. Apelin-13, a principal neuropeptide with inhibitory effects on neuroinflammation and brain oxidative stress production, has beneficial properties on memory impairment and neuronal injury. The protective effects of apelin-13 have been evaluated on ethanol-related neurotoxicity in the hippocampus of rat pups. Rat pups from 2 until 10 postnatal day, similar to the third trimester of pregnancy in humans, were intubated total daily dose of ethanol (5/27 g/kg/day). Immediately after intubation, 25 and 50 µg/ kg of apelin-13 was injected subcutaneously. By using Morris water maze task, the hippocampus- dependent memory and spatial learning were evaluated 36 days after birth. Then, Immunohistochemical staining was done to determine the levels of GFAP and caspase-3. ELISA assay was also performed to measure both TNF-α and antioxidant enzymes levels. The current study demonstrates that administration of apelin-13 attenuates spatial memory impairment significantly (P < 0.001). After ethanol neurotoxicity, apelin-13 could also increase the catalase level (P < 0.001), activity of total superoxide dismutase as well as glutathione concentration noticeably (P < 0.05). Other impacts of it could be mentioned as attenuating TNF-α production and also preventing lipid peroxidation (P < 0.001). In addition, the results showed that the level of GFAP as a neuroinflammation factor and the number of active caspase-3 positive cells can be decreased by apelin-13 (P < 0.01). Regarding the protective effects of apelin-13 against ethanol-induced neurotoxicity, it is a promising therapeutic choice for FASD; but more studies are needed.

Simvastatin attenuates spatial memory impairment via inhibiting microgliosis and apoptotic cell death against ethanol induced neurotoxicity in the developing rat hippocampus.

Ethanol is associated with oxidative stress. Exposure to ethanol during childhood may lead to neurological disorders. Congenital disorders induced by alcohol are mainly caused by an oxidative-inflammatory cascade due to extensive apoptotic neurodegeneration in the brain, particularly in the hippocampus. Simvastatin, which acts as an inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA), is widely used to manage cardiovascular diseases. Recently, the neuroprotective effects of simvastatin against nervous system disorders have been introduced. In this study, we examined the protective effects of simvastatin on ethanol-related neurotoxicity in the hippocampus of rat pups. Ethanol (5.27 g/kg) in a milk solution (27.8 mL/kg) was administered to male rat pups via intragastric intubation at 2-10 days after birth. Also, 10 and 20 mg/kg of simvastatin were injected to the animals. By using Morris water maze task, the hippocampus-dependent memory and spatial learning was evaluated 36 days after birth. An ELISA assay was performed to investigate the antioxidant and anti-inflammatory effects of simvastatin by measuring the levels of tumor necrosis factor-α (TNF-α), and antioxidant enzymes. To assess the expression levels of Iba1 immunohistochemical staining and caspase-3 immunofluorescence staining was performed. The current study demonstrated that administration of simvastatin significantly attenuates spatial memory impairment (P < 0.01) after ethanol neurotoxicity. Also simvastatin could considerably increase the total superoxide dismutaseand glutathione levels (P < 0.01). Moreover, it was associated with a greater reduction in malondialdehyde (P < 0.05) and TNF-α levels, compared to the ethanol group (P < 0.01). Furthermore, in the simvastatin group, the hippocampal level of caspase-3 and the level of Iba1-positive cells, reduced (P < 0.01). This study demonstrated that apoptotic signaling, mediated by the oxidative-inflammatory cascade, could be inhibited by simvastatin in rat pups with ethanol exposure in the postnatal period.

Hydrogen sulfide protects hippocampal CA1 neurons against lead mediated neuronal damage via reduction oxidative stress in male rats.

H2S plays vital roles in modulation brain function. It is associated with antioxidant and anti-inflammatory properties. We assessed the H2S impact on spatial learning and memory deficit and cell death due to lead exposure, and probable mechanisms of action. The 36 male Wistar rats that (200-220 g), were in random assigned to 3 groups, control group (12 rats), lead acetate group (12 rats), and lead acetate +H2S groups (NaHS as a H2S donor; 5/6 mg/kg; 12 rats). Administration of lead to rats was performed through acute lead poisoning (25 mg/kg of lead acetate, IP through 3 days). Using male Morris water maze, their spatial learning and memory function were measured. We carried out ELISA method to calculate TNF-α and antioxidant enzymes level. Immunohistochemical staining was applied for evaluating the caspase-3 expression levels. Treatment with H2S improved learning and memory impairment in Pb-exposed rats (P<0.05). H2S treatment suppressed Pb-related apoptosis in the hippocampal CA1 subfield (P<0.01). Also, the TNF-α over-expression in the CA1 region of hippocampus due to lead exposure showed a significant reduction (P<0.05) after administrating H2S. Simultaneously, H2S treatment reduced the MDA levels, enhanced SOD, GSH level than the Pb-exposed group in hippocampus (P<0.05). H2S was able to significantly improve Pb-related spatial learning and memory deficit, and neuronal cell death in the CA1 region of hippocampus in the male rats at least partly by reducing oxidative stress and TNF.

Palmatine ameliorates nephrotoxicity and hepatotoxicity induced by gentamicin in rats.

The aim of this study was to investigate the effects of palmatine on gentamicin toxicity. Rats arranged in four groups: 1- Sham, 2- GM, 3- & 4- GM + palmatine (50 & 100 mg/kg). Gentamicin led to increase in plasma AST, ALT, BUN and creatinine. In addition, fractional excretion of Na and K were increased and urine flow rate and creatinine clearance were decreased in gentamicin group. Liver and renal tissues malondialdehyde were increased, and glutathione was decreased in GM group. TUNEL assay showed induction of apoptosis in liver and kidney in GM group. Palmatine treatment caused reduction in plasma AST, ALT, urine flow rate, creatinine clearance, renal and hapatic malondialdehyde, apoptosis and increase in renal and hapatic glutathione, fractional excretion of Na and K, plasma BUN and creatinine in contrast to GM group. Our data showed palmatine reduced hepatotoxicity and nephrotoxicity by inhibition of oxidative stress and apoptosis.

Effects of berberine hydrochloride on methamphetamine-induced anxiety behaviors and relapse in rats.

OBJECTIVES: This research aimed at evaluating the effect of berberine hydrochloride on anxiety-related behaviors induced by methamphetamine (METH) in rats, assessing relapse and neuroprotective effects. MATERIALS AND METHODS: 27 male Wistar rats were randomly assigned into groups of Control, METH-withdrawal (METH addiction and subsequent withdrawal), and METH addiction with berberine hydrochloride oral treatment (100 mg/kg/per day) during the three weeks of withdrawal. Two groups received inhaled METH self-administration for two weeks (up to 10 mg/kg). The elevated plus maze (EPM) test and open field test (OFT) were carried out one day after the last berberine treatment and relapse was assessed by conditional place preference (CPP) test. TUNEL assay and immunofluorescence staining for NF-κB, TLR4, Sirt1, and α-actin expression in the hippocampus were tested. RESULTS: After 3 weeks withdrawal, berberine hydrochloride decreased locomotor activity and reduced anxiety-related behaviors in comparison with the METH-withdrawal group (P<0.001). The obtained results from CPP showed that berberine significantly reduced relapse (P<0.01). Significantly decrease in activation of TLR4, Sirt1, and α-actin in METH-withdrawal group was found and the percentage of TLR4, Sirt1, and α-actin improved in berberine-treated group (P<0.001). A significant activity rise of NF-κB of cells in the METH-withdrawal group was detected compared to berberine-treated and control groups (P<0.001). CONCLUSION: Treatment with berberine hydrochloride via modulating neuroinflammation may be considered as a potential new medication for the treatment of METH addiction and relapse. The histological assays supported the neuroprotective effects of berberine in the hippocampus.

Usnic acid improves memory impairment after cerebral ischemia/reperfusion injuries by anti-neuroinflammatory, anti-oxidant, and anti-apoptotic properties.

OBJECTIVES: Cerebral ischemia/reperfusion causes complex pathological mechanisms that lead to brain tissue damage. Usnic acid is a lichen secondary metabolite that has many different biological properties including anti-inflammatory and anti-oxidant activities. Therefore, the objective of the current study was to investigate the neuroprotective effects of usnic acid on apoptotic cell death, neuroinflammation, anti-oxidant enzyme activities, and oxidative stress levels after transient cerebral ischemia/reperfusion. MATERIALS AND METHODS: Forty-two male Wistar rats were randomly assigned to three groups (sham, ischemia/reperfusion, and ischemia/reperfusion+usnic acid). Ischemia was induced by 20 min occlusion of common carotid arteries. Injection of usnic acid (25 mg/kg, intraperitoneally) and saline was done at the beginning of reperfusion time. Morris water maze was applied to assess spatial memory. The protein expression amount was measured using immunohistochemical and immunofluorescence staining. Spectrophotometric assay was performed to determine the levels of anti-oxidant enzymes. RESULTS: Usnic acid significantly reduced caspase-3, glial fibrillary acidic protein- positive and ionized calcium-binding adaptor molecule 1-positive cells (P<0.001) and enhanced spatial memory disorders (P<0.05) due to brain ischemia. In addition, treatment with usnic acid improves effects in the antioxidant system following cerebral ischemia (P<0.05). CONCLUSION: Our findings indicate that usnic acid has neuroprotective properties, which possibly is applicable as a promising candidate for cerebral injuries caused by ischemia.

Alginate hydrogel containing hydrogen sulfide as the functional wound dressing material: In vitro and in vivo study.

Functional and bioactive wound dressing materials are revolutionary for wound care and healing applications. In this concept, we fabricated alginate hydrogel (Alg) containing H2S as the wound dressing materials and assessed the morphology, swelling, degradation, and release behavior, as well as the biocompatibility, cytocompatibility, and wound healing activity. The results depicted that the prepared hydrogels have a porous structure with the pore size in the range of 50 to 100 µm. Swelling and degradation studies showed that the hydrogel absorbed water about 179 ± 5% of initial dry weight during 96 h and loos about 80% of the initial dry weight after 7 days. The in vitro assessments illustrated that the optimum concentration of H2S was 0.5% and the higher concentration induced hemolysis and cell toxicity. The in vivo study revealed that the treatment by Alg/H2S 0.5% induced the highest wound closure percent with a value of 98 ± 1.22%. Moreover, the treatment by Alg/H2S 0.5% elicited the formation of sebaceous glands, hair follicles, and complete epithelization without any fibroplasia or inflammation, revealed by the histopathological observations. Accordingly, these results illustrated that the prepared Alg/H2S 0.5% could be applied as the functional and bioactive wound dressing materials.

Carvacrol reduces hippocampal cell death and improves learning and memory deficits following lead-induced neurotoxicity via antioxidant activity.

Carvacrol is a monoterpene with neuroprotective effects in several animal models of neurodegeneration, including epilepsy, ischemia, and traumatic neuronal events. In this study, we aimed to examine the effects of carvacrol on neurodegeneration induced by lead acetate in rats. A total of 50 male Wistar rats were divided into five equal groups. The control group received drinking water, while the neurotoxic group was exposed to 500 ppm of lead acetate in drinking water for 40 days. The three remaining groups, which were also exposed to 500 ppm of lead acetate, received carvacrol at doses of 25, 50, and 100 mg/kg orally for 40 days. The Morris water maze test was employed to examine spatial learning and memory. Pathological damage to the hippocampus was determined by Nissl staining. The level of malondialdehyde (MDA), superoxide dismutase (SOD), and catalase (CAT) were detected using biochemical analysis and the free radical scavenging activity as evaluated by the DPPH test. Administration of carvacrol significantly restored learning and memory impairment induced by lead acetate. Moreover, carvacrol ameliorated neurodegeneration, antioxidative capacity, and lipid peroxidation in the hippocampus of rats exposed to lead. The present results provide a rationale for the inhibitory role of carvacrol in the attenuation of lead-induced neurotoxicity.

Hydrogen Sulfide Attenuates the Neurotoxicity in the Animal Model of Fetal Alcohol Spectrum Disorders.

Fetal alcohol spectrum disorder (FASD), which is caused by prenatal alcohol exposure, can result in cell death in specific brain regions. Alcohol-induced neurocognitive defects offspring's are included with activation of oxidative-inflammatory cascade followed with wide apoptotic neurodegeneration in many brain's regions such as hippocampus. According to the latest studies, H2S (hydrogen sulfide) can protect neuronal cells via antioxidant, anti-inflammatory, and anti-apoptotic mechanisms in different animal models. Therefore, we aimed to evaluate the protective effects of H2S on ethanol-induced neuroinflammation and neuronal apoptosis in pup hippocampus with postnatal alcohol exposure. Administration of ethanol (5.27 g/kg) in milk solution (27.8 mL/kg) for each rat pups was performed through intragastric intubation on 2 to 10 postnatal days and NaHS as H2S donor (1 mg/kg) was injected on similar time, subcutaneously. For examining the antioxidant and anti-inflammatory effects, ELISA assay was performed to determine the levels of TNF-α, IL1ß, and antioxidant enzymes. Immunohistochemical staining was performed to evaluate the expression levels of GFAP and caspase-3 also Nissl staining was done for necrotic cell death evaluation. H2S treatment could significantly increase the activity of total superoxide dismutase, catalase, and glutathione (P < 0.05). It also decreased the levels of TNF-α, IL1ß, and malondialdehyde, compared with the ethanol group (P < 0.05). Moreover, the number of hippocampal caspase-3, GFAP-positive cells, and necrotic cells death reduced in the H2S group (P < 0.01). Based on the findings, H2S can inhibit apoptotic signaling that is mediated by the oxidative-inflammatory cascade following ethanol exposure of rat pups on postnatal period.

Molecular Docking Studies of Methamphetamine and Amphetamine- Related Derivatives as an Inhibitor against Dopamine Receptor.

BACKGROUND: The catecholamines such as dopamine, norepinephrine, and epinephrine are neurotransmitters that regulate different physiological functions of the central nervous system. Some evidence suggests that the degeneration of dopamine neurons in the substantia nigra contributes to Parkinson's Disease (PD), which is a neurodegenerative disorder and it is responsible for the major symptoms of PD. It is suggested that replenishment of striatal dopamine through the oral administration of the dopamine precursor, levodopa, can compensate for the lack of endogenously produced dopamine. Some studies have shown competitive inhibition of dopamine receptor such as methamphetamine, and other amphetamine-related derivatives, which block dopamine receptor activity to uptake dopamine. METHODS: In this study, 3D structures of amphetamine, methamphetamine, cocaine, methylphenidate, cathinone, MDMA, and mephedrone were obtained from the PubChem database, which has reported some evidence about their inhibitory effect with dopamine receptor. Then, these structures were provided for molecular docking analysis by Autodock Vina software. Eventually, the binding energies between docked dopamine receptor and them were calculated and their interactions were prognosticated. RESULTS: Our results indicated that all chemicals can interact with dopamine receptor molecule in the active site of dopamine and the minimum binding energies belong to Cocaine and Methylphenidate with -7.9 Kcal/mol and -7.2 Kcal/mol, respectively. CONCLUSION: It might be concluded that amphetamine, methamphetamine, cocaine, methylphenidate, cathinone, MDMA, and mephedrone could act as potential inhibitors of DA receptor for dopamine uptake, which could cause degenerative disorders.

Hydrogen sulfide improves spatial memory impairment via increases of BDNF expression and hippocampal neurogenesis following early postnatal alcohol exposure.

According to experimental and clinical findings, fetal brain development may be interrupted by maternal alcohol consumption during pregnancy. Adult hippocampal neurogenesis is thought to play a role in cognition function (i.e. learning and memory). Recent evidence suggests that ethanol administration causes major apoptotic neurodegeneration in many regions of the rats' developing brain during the synaptogenesis period. Based on the recent studies, H2S improve learning and memory via increased neurogenesis and antiapoptotic mechanisms in different animal models. In this study, we aimed to evaluate the protective effects of hydrogen sulfide on alcohol-induced memory impairment, hippocampus neurogenesis and neuronal apoptosis in rat pups with postnatal ethanol exposure. Administration of ethanol to male rat pups was performed through intragastric intubation on postnatal days 2-10. The pups were administered 1 mg/kg of NaHS (H2S donor) on postnatal days 2-10. For examining the spatial memory, Morris water maze test was carried out 36 days after birth. Following the behavioral test, immunohistochemical staining was performed to evaluate the expression levels of BrdU, BDNF and Apoptotic cell death was detected by TUNEL staining. Hydrogen sulfide (H2S) treatment could significantly improve spatial memory impairment (P < 0.05) and significantly increase the expression of BrdU and BDNF in dentate gyrus area (P < 0.05). It also decreased positive TUNEL cells, compared with the ethanol group (P < 0.01). Based on the findings, H2S makes significant neuroprotective effects on Ethanol neurotoxicity due to its neurogenesis and anti-apoptotic activity.

Apelin-13 Protects PC12 Cells Against Methamphetamine-Induced Oxidative Stress, Autophagy and Apoptosis.

Methamphetamine (METH) is a potent psychomotor stimulant that has a high potential for abuse in humans. In addition, it is neurotoxic, especially in dopaminergic neurons. Long-lasting exposure to METH causes psychosis and increases the risk of Parkinson's disease. Apelin-13 is a novel endogenous ligand which studies have shown that may have a neuroprotective effect. Therefore, we hypothesized that Apelin-13 might adequately prevent METH-induced neurotoxicity via the inhibition of apoptotic, autophagy, and ROS responses. In this study, PC12 cells were exposed to both METH (0.5, 1, 2, 3, 4, 6 mmol/L) and Apelin-13 (0.5, 1.0, 2.0, 4.0, 8.0 µmol/L) in vitro for 24 h to measure determined dose, and then downstream pathways were measured to investigate apoptosis, autophagy, and ROS responses. The results have indicated that Apelin-13 decreased the apoptotic response post-METH exposure in PC12 cells by increasing cell viability, reducing apoptotic rates. In addition, the study has revealed Apelin-13 decreased gene expression of Beclin-1 by Real-Time PCR and LC3-II by western blotting in METH-induced PC12 cells, which demonstrated autophagy is reduced. In addition, this study has shown that Apelin-13 reduces intracellular ROS of METH-induced PC12 cells. These results support Apelin-13 to be investigated as a potential drug for treatment of neurodegenerative diseases. It is suggested that Apelin-13 is beneficial in reducing oxidative stress, which may also play an important role in the regulation of METH-triggered apoptotic response. Hence, these data indicate that Apelin-13 could potentially alleviate METH-induced neurotoxicity via the reduction of oxidative damages, apoptotic, and autophagy cell death.

Nesfatin-1 protects PC12 cells against high glucose-induced cytotoxicity via inhibiting oxidative stress, autophagy and apoptosis.

OBJECTIVE: Diabetic neuropathy (DN) is the most common complication of diabetes mellitus. It is thought that neuronal cell death which is mainly due to reactive oxygen species (ROS) overproduction in the cells is responsible for most symptoms of this disorder. Nesfatin-1 has identified recently as a novel endogenous neuropeptide which recent studies have shown that it may have a protective effect. Therefore, we postulated that Nesfatin-1 might adequately prevent from high glucose-induced cell injury via inhibition of apoptotic, autophagy, and ROS responses. METHODS: In this study, PC12 cells were pretreated with different concentrations of Nesfatin-1 (1-100 ng/ml) and then co-treated with Nesfatin-1 and glucose (125 mM) for 48 h, and downstream pathways then were evaluated to investigate ROS, apoptosis, and autophagy. RESULTS: Results of this study showed that Nesfatin-1 can not only inhibit from intracellular ROS overproduction-induced by high glucose in PC12 cells (p < 0.0001) but also reduce the apoptotic cell death in PC12 cells following high glucose exposure by increasing cell viability and reducing apoptotic rates (p < 0.05). Furthermore, Nesfatin-1 decreased the LC3-II levels by western blotting (p < 0.0001), which showed a reduction in autophagy. CONCLUSION: These results support the idea that Nasfatin-1can protect PC12 cells against high glucose-induced cell injury by inhibition of apoptosis, autophagy and ROS production and can be considered as a potential drug for treatment of diabetic neuropathy.