31 research outputs found
The role of serotonin in memory: interactions with neurotransmitters and downstream signaling
Abstract Serotonin, or 5-hydroxytryptamine (5-HT), is
found to be involved in many physiological or pathophysiological
processes including cognitive function. Seven distinct
receptors (5-HT1–7), each with several subpopulations,
have been identified for serotonin, which are different in
terms of localization and downstream signaling. Because
of the development of selective agonists and antagonists
for these receptors as well as transgenic animal models
of cognitive disorders, our understanding of the role of
serotonergic transmission in learning and memory has
improved in recent years. A large body of evidence indicates
the interplay between serotonergic transmission and
other neurotransmitters including acetylcholine, dopamine,
γ-aminobutyric acid (GABA) and glutamate, in the neurobiological
control of learning and memory. In addition,there has been an alteration in the density of serotonergic
receptors in aging and Alzheimer’s disease, and serotonin
modulators are found to alter the process of amyloidogenesis
and exert cognitive-enhancing properties. Here, we discuss
the serotonin-induced modulation of various systems
involved in mnesic function including cholinergic, dopaminergic,
GABAergic, glutamatergic transmissions as well
as amyloidogenesis and intracellular pathways
Tropisetron attenuated the anxiogenic effects of social isolation by modulating nitrergic system and mitochondrial function.
Abstract
BACKGROUND:
Early social isolation stress (SIS) is associated with the occurrence of anxiety behaviors. It seems interaction between the nitrergic system and mitochondrial function plays a role in mediating the anxiety-like behaviors. In this study, we aimed to investigate the anxiolytic effects of tropisetron in animal model of SIS and we try to illustrate the possible role of nitrergic system and mitochondrial function.
METHODS:
We applied early social isolation paradigm to male NMRI mice. Animals treated with various doses of tropisetron, nitric oxide agents or their combination and anxiety-like behaviors of animals were assessed using valid behavioral tests including elevated plus maze (EPM), open-field test (OFT) and hole-board test (HBT) in their adulthood. Effects of housing conditions and drug treatments on the mitochondrial function were investigated in the hippocampus by assessing the ATP, GSH, ROS and nitrite levels.
RESULTS:
Anxiogenic effects of early SIS were assessed in the EPM, OFT, and HBT. Also, SIS disrupted mitochondrial function and caused oxidative stress in the hippocampus of stressed animals. Tropisetron showed an anxiolytic effect in the stressed mice. Also, these effects were mediated by nitrergic system by affecting mitochondrial function and modulating the oxidative stress. L-arginine, a nitric oxide precursor, abolished the anxiolytic effects of tropisetron in the behavioral tasks and blocked the protective effects of it against mitochondrial and oxidative challenge.
CONCLUSIONS AND GENERAL SIGNIFICANCE:
Our results demonstrated tropisetron attenuated the anxiogenic effects of SIS by mitigation of the negative effects of nitric oxide on mitochondrial functio
Anti-inflammatory effect of AMPK signaling pathway in rat model of diabetic neuropathy
Abstract Diabetic neuropathy (DN) is characterized as
Hyperglycemia activates thdisturbed nerve conduction and
progressive chronic pain. Inflammatory mediators, particularly
cytokines, have a determinant role in the
pathogenesis of neuropathic pain. The activity of adenosine
monophosphate protein kinase (AMPK), an energy charge
sensor with neuroprotective properties, is decreased in
diabetes. It has been reported that activation of AMPK
reduces the systemic inflammation through inhibition of
cytokines. In this study, we aimed to investigate the
probable protective effects of AMPK on DN in a rat of
diabetes. DN was induced by injection of streptozotocin
(65 mg/kg, i.p.). Motor nerve conduction velocities
(MNCV) of the sciatic nerve, as an electrophysiological
marker for peripheral nerve damage, were measured.
Plasma levels of IL-6, TNF-a, CRP were assessed as
relevant markers for inflammatory response. Also, the
expression of phosphorylated AMPK (p-AMPK) and nonphosphorylated
(non-p-AMPK) was evaluated by western
blotting in the dorsal root ganglia. Histopathological
assessment was performed to determine the extent of nerve
damage in sciatic nerve. Our findings showed that activation
of AMPK by metformin (300 mg/kg) significantly
increased the MNCV and reduced the levels of inflammatory
cytokines. In addition, we showed that administration
of metformin increased the expression of p-AMPK as well
as decline in the level of non p-AMPK. Our results
demonstrated that co-administration of dorsomorphin with
metformin reversed the beneficial effects of metformin. In
conclusion, the results of this study demonstrated that the
activation of AMPK signaling pathway in diabetic neuropathy
might be associated with the anti-inflammatory
response
The Expression and Function of Nitric Oxide Synthase Enzyme in Atorvastatin Effects on Morphine-Induced Dependence in Mice
Background: Atorvastatin exerts neuroprotective effects on the treatment of central nervous system disorders. Morphine analgesic tolerance and dependence remain as major concerns in medicine. Nitric oxide (NO) pathway mediates the development of opioid analgesic tolerance and dependence, as well as atorvastatin neuroprotection. Objectives: The present study aimed to assess the possible involvement of the NO/cGMP pathway in the process of the effects of atorvastatin on morphine physical dependence. Methods: Dependence was induced by repetitive injection of morphine sulfate. Naloxone was injected at the dose of 4 mg/kg on the last day of the experiment to assess withdrawal signs. Animals received atorvastatin (1, 5,10, and 20 mg/kg, orally). Nitric oxide synthase (NOS) inhibitors and ODQ were injected before protective dose of atorvastatin. The gene expression of NOS isoforms was evaluated by real-time PCR. Thereafter, the hippocampal levels of cGMP and nitrite were measured. Results: Treatment with atorvastatin 10 mg/kg significantly attenuated naloxone-induced withdrawal behaviours. The administration of L-NAME, aminoguanidine, and ODQ before atorvastatin enhanced its effects. The treatment with atorvastatin significantly decreased the nitrite and cGMP levels as well as NOS gene expression in the hippocampus of dependent animals. Conclusions: It can be concluded that atorvastatin, possibly, through inducible NOS, could alleviate morphine dependence and withdrawal signs
Tropisetron suppresses colitis-associated cancer in a mouse model in the remission stage
Patients with inflammatory bowel disease (IBD) have a high risk for development of colitis-associated cancer
(CAC). Serotonin is a neurotransmitter produced by enterochromaffin cells of the intestine. Serotonin and its receptors,
mainly 5-HT3 receptor, are overexpressed in IBD and promote development of CAC through production
of inflammatory cytokines. In the present study, we demonstrated the in vivo activity of tropisetron, a 5-HT3 receptor
antagonist, against experimental CAC. CAC was induced by azoxymethane (AOM)/dextran sodium sulfate
(DDS) in BALB/c mice. The histopathology of colon tissue was performed. Beta-catenin and Cox-2 expression was
evaluated by immunohistochemistry as well as quantitative reverse transcription-PCR (qRT-PCR). Alterations in
the expression of 5-HT3 receptor and inflammatory-associated genes such as Il-1β, Tnf-α, Tlr4 and Myd88 were
determined by qRT-PCR. Our results showed that tumor development in tropisetron-treated CAC group was significantly
lower than the controls. The qRT-PCR analysis demonstrated that the expression of 5-HT3 receptor was
significantly increased following CAC induction. In addition, tropisetron reduced expression of β-catenin and
Cox-2 in the CAC experimental group. The levels of Il-1β, Tnf-α, Tlr4 and Myd88 were significantly decreased
upon tropisetron treatment in the AOM/DSS group. Taken together, our data show that tropisetron inhibits development
of CAC probably by attenuation of inflammatory reactions in the colitis
Cyclosporin A attenuating morphine tolerance through inhibiting NO/ERK signaling pathway in human glioblastoma cell line
Cyclosporin A (CsA) is known to have an immunosuppressive action. However, it is also attracting attention due to its effects on the nervous system, such as inhibiting the development and expression of morphine-induced tolerance and dependence through unknown mechanisms. It has been shown that CsA modulates the nitric oxide (NO) synthesis and extracellular signal-regulated kinases (ERK) activation, which are potentially involved in signaling pathways in morphine-induced tolerance in cellular models. Therefore, the current study was designed to evaluate the modulatory role of CsA on the MOR tolerance, by targeting the downstream signaling pathway of NO and ERK using an in vitro model. For this purpose, T98G cells were pretreated with CsA, calcineurin autoinhibitory peptide (CAIP), and NG-nitro-l-arginine methyl ester (L-NAME) 30 min before 18 h exposure to MOR. Then, we analyzed the intracellular cyclic adenosine monophosphate (cAMP) levels and also the expression of phosphorylated ERK and nitric oxide synthase (nNOS) proteins. Our results showed that CsA (1 nM, 10 nM, and 100 nM) and CAIP (50 μM) have significantly reduced cAMP and nitrite levels as compared to MOR-treated (2.5 μM) T98G cells. This clearly revealed the attenuation of MOR tolerance by CsA. The expression of nNOS and p-ERK proteins were down-regulated when the T98G cells were pretreated with CsA (1 nM, 10 nM, and 100 nM), CAIP (50 μM), and L-NAME (0.1 mM) as compared to MOR. In conclusion, the CsA pretreatment had a modulatory role in MOR-induced tolerance, which was possibly mediated through NO/ERK signaling pathway
NMDA receptor antagonists attenuate the proconvulsant effect of juvenile social isolation in male mice
Experiencing psychosocial stress inearly life, suchas social isolationstress (SIS), is knowntohavenegative
enduring effects on the development of the brain and behavior. In addition to anxiety and depressive-like
behaviors, we previously showed that juvenile SIS increases susceptibility to pentylenetetrazole (PTZ)-
induced seizures in mice through enhancing the nitrergic system activity in the hippocampus. In this
study, we investigated the possible involvement of N-methyl-d-aspartate (NMDA) receptors in proconvulsant
effects of juvenile SIS. Applying 4 weeks of SIS to juvenile male mice at postnatal day 21–23, we
observed an increased susceptibility to PTZ as well as anxiety and depressive-like behaviors in adult mice.
Intraperitoneal (i.p.) administration of NMDA receptor antagonists, MK-801 (0.05 mg/kg) and ketamine
(0.5 mg/kg), reversed the proconvulsant effects of SIS in Isolated (and not social) housed animals. Coadministration
of non-effective doses of nitric oxide synthase (NOS) inhibitors, 7NI (25 mg/kg) and
L-NAME (10 mg/kg), with NMDA receptor antagonists, MK-801 (0.01 mg/kg) and ketamine (0.1 mg/kg)
attenuated the proconvulsant effects of juvenile SIS only in isolated housed mice. Also, using real time
RT-PCR, we showed that hippocampal upregulation of NR2B subunit of NMDA receptor may play a critical
role in proconvulsant effects of juvenile SIS by dysregulation of NMDA/NO pathway. In conclusion,
results of present study revealed that experiencing SIS during adolescence predisposes the co-occurrence
of seizure disorders with psychiatric comorbidities and also, alteration of NMDA receptor structure and
function in hippocampus plays a role in proconvulsant effects of juvenile SIS through enhancing the
NMDA/NO pathwa
Oxytocin mitigated the depressive-like behaviors of maternal separation stress through modulating mitochondrial function and neuroinflammation
Mother-infant contact has a critical role on brain development and behavior. Experiencing early-life adversities (such as maternal separation stress or MS in rodents) results in adaptations of neurotransmission systems, which may subsequently increase the risk of depression symptoms later in life. In this study, we show that Oxytocin (OT) exerted antioxidant and anti-inflammatory properties. Previous studies indicate that neuroinflammation and mitochondrial dysfunction are associated with the pathophysiology of depression. To investigate the antidepressant-like effects of OT, we applied MS paradigm (as a valid animal model of depression) to male mice at postnatal day (PND) 2 to PND 14 (3 h daily, 9 AM to 12 AM) and investigated the depressive-like behaviors of these animals at PND 60 in different groups. Animals in this work were divided into 4 experimental groups: 1) saline-treated, 2) OT-treated, 3) atosiban (OT antagonist)-treated and, 4) OT + atosiban-treated mice. We used forced swimming test (FST), splash test, sucrose preference test (SPT) and open field test (OFT) for behavioral assessment. Additionally, we used another set of animals to investigate the effects of MS and different treatments on mitochondrial function and the expression of the relevant genes for neuroinflammation. Our results showed that MS provoked depressive- like behaviors in the FST, SPT and splash test. In addition, our molecular findings revealed that MS is capable of inducing abnormal mitochondrial function and immune-inflammatory response in the hippocampus. Further, we observed that treating stressed animals with OT (intracerebroventricular, i.c.v. injection) attenuated the MS-induced depressive-like behaviors through improving mitochondrial function and decreasing the hippocampal expression of immune-inflammatory genes. In conclusion, we showed that MS-induced depressive-like behaviors in adult male mice are associated with abnormal mitochondrial function and immune-inflammatory responses in the hippocampus, and activation of OTergic system has protective effects against negative effects of MS on brain and behavior of animals
Attenuation of oxidative and nitrosative stress in cortical area associates with antidepressant-like effects of tropisetron in male mice following social isolation stress.
Tropisetron, a 5-HT3 receptor antagonist widely used as an antiemetic, has been reported to have positive
effects on mood disorders. Adolescence is a critical period during the development of brain, where
exposure to chronic stress during this time is highly associated with the development of depression.
In this study, we showed that 4 weeks of juvenile social isolation stress (SIS) provoked depressive-like
behaviors in male mice, which was associated with disruption of mitochondrial function and nitric oxide
overproduction in the cortical areas. In this study, tropisetron (5 mg/kg) reversed the negative behavioral
effects of SIS in male mice. We found that the effects of tropisetron were mediated through mitigating
the negative activity of inducible nitric oxide synthase (iNOS) on mitochondrial activity. Administration
of aminoguanidine (specific iNOS inhibitor, 20 mg/kg) augmented the protective effects of tropisetron
(1 mg/kg) on SIS. Furthermore, l-arginine (nitric oxide precursor, 100 mg/kg) abolished the positive
effects of tropisetron. These results have increased our knowledge on the pivotal role of mitochondrial
function in the pathophysiology of depression, and highlighted the role of 5-HT3 receptors in psychosocial
stress response during adolescence. Finally, we observed that tropisetron alleviated the mitochondrial
dysfunction through decreased nitrergic system activity in the cerebral corte
Professor Morteza Samini Retired Editor-in-Chief of Acta Medica Iranica (1945-2020)
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