جستجوی مقالات مرتبط با کلیدواژه "sesamol" در نشریات گروه "پزشکی"

Sesamol is a phenolic lignan extracted from sesame seeds, and it possesses anti-inflammatory and antioxidant activities. Lipopolysaccharide (LPS) is known to produce neuroinflammatory responses and memory impairment. The current study aimed to investigate the protective influence of sesamol against LPS-mediated neuroinflammation and memory impairment. Sesamol (10 and 50 mg/kg) was injected to Wistar rats for two weeks. Then, animals received LPS injection (1 mg/kg) for five days, while treatment with sesamol was performed 30 min before LPS injection. Spatial learning and memory were assessed by the Morris water maze (MWM), two hours after LPS injection on days 15-19. Biochemical assessments were performed after the end of behavioral experiments. LPS-administered rats showed spatial learning and memory deficits, since they spent more time in the MWM to find the hidden platform and less time in the target quadrant. Besides these behavioral changes, tumor necrosis factor-α (TNF-α) and lipid peroxidation levels were increased, while total thiol level was decreased in the hippocampus and/or cerebral cortex. In addition, sesamol treatment (50 mg/kg) for three weeks decreased the escape latency and increased the time on probe trial. Sesamol also reduced lipid peroxidation and TNF-α level, while enhanced total thiol level in the brain of LPS-exposed rats. Supplementation of sesamol attenuated learning and memory impairments in LPS-treated rats via antioxidative and anti-inflammatory activities in the rat brain.

Peripheral nerve injury is a clinical problem that may cause sensory and motor inabilities. Sesamol is an antioxidant that can help in repairing damaged central nervous system (CNS) and other organs. The present study aimed to investigate whether the antioxidant effects of sesamol could improve the function, structure, and myelination in rats’ damaged peripheral nervous system (PNS). In this study, 28 adult male Wistar rats were randomly divided into four groups. In the sham group, the sciatic nerve was exposed and restored to its place without inducing crush injury. The control received DMSO (solvent) and the two experimental groups received 50 or 100 mg/kg sesamol intraperitoneally for 28 days after sciatic nerve crush injury, respectively. Next, sciatic function index (SFI), superoxide dismutase (SOD) activity, malondialdehyde (MDA) level, expression of nerve growth factor (NGF) and myelin protein zero (MPZ) proteins in the sciatic nerve, and histological indices of the sciatic nerve and gastrocnemius muscle were evaluated. The results showed that sesamol reduced oxidative stress parameters, increased expression of NGF and MPZ proteins, and improved function and regeneration of the damaged sciatic nerve. Furthermore, a significant regeneration was observed in the gastrocnemius muscle after treatment with sesamol. Although administration of both doses of sesamol was useful, the 100 mg/kg dose was more effective than the 50 mg/kg one. The results suggest that sesamol may be effective in improving damaged peripheral nerves in rats by reducing oxidative stress and increasing the expression of NGF and MPZ proteins.

Neuroinflammation and oxidative stress play critical roles in the pathophysiology of Parkinson’s disease (PD), and neuroprotective agents could be helpful to slow down the dopaminergic neurodegeneration. Neuroprotective and antioxidant properties of exercise and sesamol have been previously reported. The current research evaluated the influences of sesamol and exercise on memory and motor impairments, oxidative stress and inflammatory markers in an experimental model of PD.

6-hydroxydopamine (6-OHDA) was microinjected into the medial forebrain bundle of male rats. Treatment with sesamol (50mg/kg) or treadmill exercise was performed for 7 weeks. Behavioral and biochemical assessments were performed at the end of 6th week after 6-OHDA injection.

Net number of rotations and tumor necrosis factor (TNF)-α level was significantly enhanced in 6-OHDA group in comparison with sham group. Also, step-through latency was decreased in this group along with increased lipid peroxidation and decreased total thiol levels in the hippocampus. Moreover, sesamol and exercise, alone or in combination, improved rotational behavior, which was accompanied by decreased striatal TNF-α level. However, sesamol and/or treadmill exercise had no effect on aversive memory, although exercise enhanced hippocampal total thiol level.

Beneficial properties of sesamol and treadmill exercise for amelioration of motor impairments might be due to their anti-inflammatory activities.

The unfavorable physicochemical properties of well recognized antioxidant phytoactive sesamol limits its oral bioavailability as well as use as an effective therapeutic agent. Thus present study was started with aim to fabricate sesamol loaded hyaluronic acid anchored phospholipid nanovesicles to minimize limitations associated with conventional delivery of sesamol and to enhance its antioxidant potential. Drug encapsulated hyalurosomes were formulated using thin film hydration technique and evaluated with respect to particle size, zeta potential, entrapment efficiency, in vitro release behavior and DPPH radical scavenging assay. The selected technique was found to be effective for preparation of phospholipid nanovesicles with particle size 200 ± 10.173 nm and zeta potential -29.8 ± 4.16 mV. The drug loaded hyalurosomes revealed significantly better radical scavenging potential compared to free sesamol and unloaded hyalurosomes. Hyaluronic acid functionalized phospholipid nanovesicles is novel phospholipid based carrier for delivery of phytoactives. Thus formulated phospholipid based system could be promising alternative to deliver sesamol with improved antioxidant potential.

Liver diseases affect millions of people worldwide, which are difficult to treat with conventional drug delivery. Numerous drugs have been investigated for treatment of diseases associated with liver however correct drug delivery system need to be find for delivery of drugs. Sesamol is a well-recognized antioxidant phytoactive found in sesame oil has reported to scavenge hydroxyl radical. However unfavorable physicochemical properties limits its use as effective therapeutic agent. Thus present study was started with aim to fabricate sesamol loaded polymeric nanoparticles to minimize limitations associated with conventional delivery of sesamol. Drug encapsulated nanoparticles were formulated using solvent evaporation ultrasonication technique. The selected technique was found to be effective for preparation of nano sized particles with good physicochemical properties. The formulated nanoparticles were evaluated with respect to physicochemical properties and in vivo hepatoprotective potential. The drug loaded nanoparticles revealed significantly better hepatoprotective activity with reduction of serum liver injury markers and proinflammatory cytokines compared to standard Liv-52. Thus formulated nano sized particles based system could be promising alternative to deliver sesamol.

Sesame (Sesamum indicum L.) seeds have been a well-known oil crop in the world for many centuries. Lignans are functionally important compartments of sesame. Sesamin and sesamol are the main sesame lignans, which have recently shown various activities with health benefits, like anti-oxidative, anti-proliferative, anti-atherosclerotic, anti-inflammatory and anticancer effects. The aim of this study was determination of sesamin and sesamol concentration in sesame seeds from three different regions of Iran with diverse climatic conditions (Dezful, Ardakan and Neka). In addition, the effect of roasting process on sesamin and sesamol content were investigated.

Analysis of sesamin and sesamol was performed using the mobile phase water: methanol (70:30) on a reversed phase ACE C18 with flow rate of 0.6 mL/min and UV detection at 290 nm.

HPLC analysis revealed that the highest content of sesamin (1.156±0.002 mg/g of seeds) and sesamol (2.393±0.002 mg/g of seeds) were observed in roasted Dezful seeds samples and hulled roasted Dezful sesame seeds, respectively. The amount of sesamin and sesamol in roasted seeds was higher than unroasted samples.

The present study showed that the roasting process and hot semi-arid climate increase the content of lignans in sesame seeds. Consuming sesame seeds with such characteristics will improve dietary lignan intake and has nutritive value. Moreover, sesame seed characterized by the highest amount of sesamin and sesamol is more strongly suggested for achieving biological properties of these components.

Herbal medicine is becoming progressively accepted treatment for management of different diseases worldwide. Recognition of the active ingredients and mechanisms of herbal medicine against the immune system and related anomalies is highly favorable. This experimental study aimed to investigate the effects of Sesame (Sesamum indicum L.) essential oil and sesamol as effective components on mouse splenocytes subsets, macrophages and dendritic cells (DCs). Effective components of sesame were extracted and used to treat splenocytes, PHA (5μg/ml) and LPS (10 μg/ml) stimulated splenocytes, macrophages and DCs in different concentration (0.01–100 μg/ml). The cell proliferation/viability was measured using the MTT assay and nitrite levels were measured by the diazotization method. Moreover, TNF-α and IL-1β cytokines concentration were assayed by ELISA. Treated DCs also analysed for maturation marker levels and cytokine production. Analysis of the results indicated that sesame components suppress PHA-stimulated splenocytes with no effect on LPS-stimulated subsets. Furthermore, the sesame ingredients reduced the release of IFN-γ and increased secretion of IL-4 from lymphocytes. Macrophages viability was not affected and production of NO, TNF-α, and IL-1β were inhibited using sesame essential oil and sesamol. DCs phenotype skewed to immature and release of TNF-α and IL-1β were abrogated form DCs. These results indicate that sesame essential oil and its effective component as sesamol may capable of suppressing the response of cellular immunity with the domination of Th2 responses and also could modulate macrophages and the dendritic cells pro-inflammatory functions.