Showing 14 results for Morphine
Dr Malak Soleimani, Dr Hedayat Sahraei, Dr Mehr Angiz Sadooghi, Ms Parisa Maleki,
Volume 9, Issue 2 (6-2006)
Abstract
Introduction: Investigations has showed that prenatal exposure to Morphine causes drug dependency and behavioral complications in new born rats. In this study effect of prenatal Morphine on the development of basal ganglia in rat embryos is investigated. Materials and Methods: In this experimental study 36 female rats with body weight between 250-300 grams were selected. After crossing with male rats they were divided into six groups of 12days control-Morphine, 14days control-Morphine and 17days control-Morphine groups. Morphine groups received 0.01mg/ml Morphine through their drinking water until the 12, 14 and 17th day of pregnancy (20ml each rat). Then rats were anesthetized and embryos were taken out and fixed. Their body weight and crown-rump length were measured. Then 5 micrometers sections were provided and stained using H & E method which were then evaluated using mutic program. Results: Body weight and length of embryos were reduced significantly in the 12&14th day of Morphine group rats in compare to their controls. The significant reduction of Basal Ganglia thickness was also found in all Morphine groups compared to their controls. Conclusion: Results showed that prenatal Morphine exposure may cause impairment in change development of Basal Ganglia.
Saghar Saeedabadi, Mehrangiz Sdoughi, Hedayat Sahraei, Hosein Bahadoran, Javad Fahanik Babaiee, Sirous Jalili,
Volume 11, Issue 1 (3-2008)
Abstract
Introduction: Opioids abuse is a nationwide problem in our country. Regarding the potential of these drugs in crossing placenta they can cause many defects in fetuses of human and also animals. In the present study, the effects of maternal Morphine consumption on olfactory bulb development in rats have been investigated. Materials and Methods: Female Wistar rats (weight: 250-300g) were crossed with male rats and the zero time of pregnancy was detected. Existence of vaginal plug and also sperm in vaginal smear were indicators of mating and pregnancy. Experimental group received 0.05 mg/ml of Morphine in drinking water daily. On embryonic day 19, pregnant animals were anesthetized by Chloroform and embryos were taken out surgically. Weight of the embryos was determined by a digital balance and their length (Crown-Rump, Frontal-Occipital, Biparietal, Abdominal-Transfer and Anterior-Posterior diameters) were determined by a caliper. Then embryos were fixed in Formalin 10% and tissues were processed and sectioned and stained in Hematoxilin & Eosin and Bielschwosky staining methods. These sections were investigated for olfactory bulb development by MOTIC software and light Microscope. Data was analyzed using t-test. Results: The decrease in embryonic weight and their diameter for experiment group was significant. In microscopic study, the increase in thickness of mitral layer and the decrease in total number of Tufted, Mitral and Granular cells in experimental group were significant. Conclusion: This study showed that oral Morphine consumption leads to olfactory bulb defects.
Seyed Mehdi Shariatzadeh, Hamidreza Momeni, Shahrbanoo Oryan, Neda Baghinia,
Volume 14, Issue 5 (11-2011)
Abstract
Background: Morphine is one of the derivations of opium alkaloids. Contradictory reports exist on hyperglycemic and hypoglycemic effects of morphine. The aim of this study was to evaluate the role of opioid receptors involved in blood glucose changes in morphine-treated Balb/c mice.
Materials and Methods: This experimental study was carried out on 8 groups of male Balb/c mice (n=6), including group1(morphine), group 2 (naloxone (morphine antagonist) + morphine), group 3 (naltrindole ( receptor antagonist) + morphine), group 4 (norbinaltorphimine ( receptor antagonist) + morphine), group 5 (CTOP ( receptor antagonist) + morphine), group 6 (saline), group 7 (saline + saline), and group 8 (saline + morphine). Blood samples were obtained from retro-orbital sinus at 0, 1, 2, and 3 hours after injection. Blood glucose level was measured by enzymatic technique. Data were analyzed by SPSS software.
Results: The application of morphine resulted in significant hypoglycemia in comparison with the control group which was significantly compensated by naloxone compared to the morphine group. The application of naltrindole could significantly inhibit hypoglycemia induced by morphine compared to the control group, whereas norbinaltorphimine and CTOP failed to do so.
Conclusion: Since naltrindole could compensate for hypoglycemia due to morphine, hypoglycemia caused by morphine is likely to be mediated by opioid receptors
Fatemeh Shima Hadipourzadeh, Hamid Kaialha, Firoozeh Naderi,
Volume 17, Issue 1 (4-2014)
Abstract
Background: Intrathecal morphine side effect is Nausea & Vomiting after surgery. The aim of the study was to evaluate the effect of intrathecal atropine on PONV in patients receiving intrathecal morphine in lower limb surgeries.
Materials and Methods: In this clinical trial , 120 patients undergoing lower limb surgery were randomly divided into 2 groups . Experimental group received 0.1 mg (1cc) Intrathecal atropine and control group received 1cc saline 0.9% . PONV during the first 24 hours and hemodynamic changes in minute 3, 5, 10 and 15 after surgery in both groups were measured. Data were analyzed using SPSS software (verision14). independent t-test, repeated measures manova,and chi-square were used to compare comparison of variables.
Results: Hemodynamic cheanges before injection and 3, 5, 10 and 15 after injection in two groups was not significant (P>0.05). None of the patients in the intervention group were PONV, but 17 patients in the control group had PONV that this difference was statistically significant (p =0.000 ). Pain in the control group was great than intervention group while 26 patients in the control group and 14 patients in the intervention group had vas greater than 3 that this difference was statistically significant( P = 0.04).
Conclusion: Intrathecal atropine without interfering Hemodynamic and pain relief prevent nausea and vomiting caused by Intrathecal morphine in patients undergoing surgery to the lower limbs..
Ameneh Rezayof, Mohammad Reza Zarrindast, Niloufar Darbandi,
Volume 17, Issue 6 (9-2014)
Abstract
Background: It is well known that morphine influence learning and memory processes. The Nucleus accumbens (N.ac) which has an important role in reward participates in morphine-induced impairment of memory retention. Considering the cholinergic system is involved in the effects of morphine on learning and memory, in the present study, the effects of intra-N.ac injections of acetylcholine receptor antagonists alone or with morphine on memory retention and morphine-induced memory has been investigated in rats.
Materials and Methods: In this original research animals were bilaterally cannulated in the N.ac and a step-through passive avoidance task was used for the assessment of memory retention .
Results: Post-training subcutaneous administration of morphine dose dependently decreased the learning and induced amnesia. The administration of the same dose of morphine as pre-test treatment induced state-dependent learning. Pre-test intra- N.ac administration of atropine, scopolamine and mecamylamine in different doses alone cannot affect on memory retention. While, pretest intra- N.ac injection of these drugs before the administration of morphine dose dependently inhibited morphine state-dependent learning. The level of statistical significance was set at p<0.05 .
Conclusion: The processes of learning in animals can be affected by morphine and the opioids produce state-dependent learning. Moreover, it can be concluded that inactivation of the muscarinic and nicotinic acethylcoline receptors in the N.ac are involved in mediating morphine state-dependent learning.
Mehdi Hooshmandi, Narges Hosseinmardi, Mahyar Janahmadi, Fereshteh Motamedi, Azadeh Elahi Mahani, Fatemeh Sadat Aghamiri,
Volume 17, Issue 6 (9-2014)
Abstract
Background: Considering the increased activity of hypothalamic orexinergic neurons due to morphine administration, and its extensive projections to the hippocampus, it is probable that morphine effect on CA1 neuronal function is mediated by orexinergic system. So the effect of hippocampal orexin-1 receptors (OX1R) blockade on CA1 baseline synaptic response and short term synaptic plasticity was investigated.
Materials and Methods: In this experimental study, animals received morphine 10 mg/kg/12h/(SC) for 10 days. SB-334867-A, OX1R antagonist (0.5&mug/0.5 &mul), was microinjected intrahippcampally for OX1R inhibition before each morphine injection. Baseline synaptic response and short term synaptic plasticity were evaluated by field potential recording. fEPSP was recorded from CA1 following Schaffer collaterals stimulation. After Input/Output construction, short term synaptic plasticity was induced by paired pulse stimulations.
Results: Chronic use of morphine did not affect the baseline synaptic response (p>0.05). SB- 334867-A microinjection in CA1 did not have any effect on baseline synaptic response in morphine dependent rats. Morphine increased paired pulse index (PPI) at 80 ms inter pulse interval (IPI, p<0.05). SB-334867-A pretreatment did not affect this morphine induced PPI change.
Conclusion: The results suggest that orexin-1 receptors (OX1R) do not mediate the effect of morphine on baseline synaptic response and short term synaptic plasticity in CA1 area of the hippocampus.
Zahra Alizadeh, Masoud Fereidoni, Morteza Behnam Rassouli,
Volume 17, Issue 7 (10-2014)
Abstract
Background: Since the anti-inflammatory effects of usual doses of morphine (10mg/kg) is proved, and also, regarding to the role of C-fibers in the release of substance P and CGRP and progression of inflammation were found, and the other hand, the excitatory effects of very low doses of morphine (1µg/kg) on C-fibers have also been reported, present study has examined the role of C-fibers, usual and very low doses of morphine in presence or reduced C-fibers on paw edema induced by sub plantar injection of formalin.
Materials & Methods: In this study, male Wistar rats (180-200g) were Categorized into two groups. One as vehicle (which received neonatal capsaicin vehicle, C-normal) and experimental (which received neonatal capsaicin, C-lesion). Each category contains three groups which were treated by saline, 10 mg/kg and 1µg/kg of morphine (i.p). In each group, paw edema volume induced by injection of 0.05 cc of 2.5% formalin, was acquired by plethysmometric test.
Results: In C-normal groups, morphine showed an anti-inflammatory effect at the dose of 10mg/kg (p<0.01) and pro-inflammatory effect at the dose of 1µg/kg (p<0.01). Reduction of C-fibers in C-lesion groups diminished the inflammation induced by formalin (p<0.001). Also in these groups, 10 mg/kg dose of morphine showed a more potent anti-inflammatory effects (p<0.001) and the pro-inflammatory effects of 1µg/kg dose of morphine reduced (p<0.001).
Conclusion: C-fibers by releasing substance P and CGRP can play an important role in inflammation induction in injured tissue. The results showed that, the reduction of these fibers can lead to inflammation reduction. So, the presences of C-fibers are so important in inflammation induction and edema.
Maryam Keiry, Mahnaz Kesmati, Hossein Najaf Zadeh, Seyed Reza Fatemi,
Volume 17, Issue 10 (1-2015)
Abstract
Background: With the increasing use of nanoparticles of zinc Oxide (nZnO) in the industry, the pharmaceutical and chemical industry, the effects of the nanoparticles on opioid dependence and its possible interaction with vitamin C (as an antioxidant agent) has not been indicated. This study aimed to clarify the effect of ZnO nanoparticles on morphine dependence in the presence and absence of vitamin C in CPP method.
Materials and Methods: In this study, adult male mice weighing 25±3 g were used in the groups which received different doses of morphine(2/5, 5, 10 mg/kg, Sc), Nano ZnO (1, 2.5, 5, 10 mg/kg, IP), vitamin C (1, 5, 25 mg/kg, IP) and groups which receiving combination of vitamin C and nano ZnO. All categories received morphine 5 mg / kg, for induction and diagnosis of dependence in CPP.
Results: Nano ZnO concentrations (2.5, 5, 10 mg/kg, IP) caused a significant decrease in morphine CPP (p <0.01, p <0.001) and the 1 mg/kg of nano was ineffective. Vitamin C in doses of 5 and 25 mg/kg decreased the expression of morphine-induced conditioned place preference (p<0.01) and a value of 1 mg/kg had no effects. All doses of ZnO in the presence of ineffective dose of vitamin C showed a stronger inhibitory effect than to alone nZnO in morphine CCP.
Conclusion: The combination of vitamin C and Nano ZnO are more effective to deal with the psychological dependence to morphin and probably can provide a new approach to addiction treatment.
Zahra Hadi Chegeni, Shahrbanoo Oryan, Abbas Zare Mirak Abadi, Azam Bakhtiarian, Somayyeh Akbari, Giti Ghamami, Khadijeh Nazari,
Volume 18, Issue 3 (6-2015)
Abstract
Background: There have been numerous reports of snake venoms being employed as analgesics in attempts to relieve severe pain associated with cancer, immune dysfunction and viral infections. This study investigates the antinociceptive effects of iranian cobra snake venom (Naja naja oxiana) in comparison with morphine and lidocain on laboratorial femal mice.
Materials and Methods: This study has been done on 48 NMRI female mice of 18-20 g in weight. Antinociceptive activeity of snake venom was evaluated by formalin test. In this test, the animals were divided into 6 groups (each group consisting of 8 mice): Sham, positive Control (receiving morphine at dose of 5 mg/kg, and receiving lidocain at dose of 20 mg/kg), and experimental groups receiving venom at doses of 1, 3 and 4.5 µg/mice. In all groups, the formalin test was recorded for 60 min after administration of venom and drugs in mice. Data were analyzed using one-way ANOVA and Tukey test.
Results: The results showed that the venom of Naja naja oxiana decreased nociception meaningfully in both acute and chronic phases. We also showed that this venom revealed even a better analgesic activity in comparison with morphine and lidocain.
Conclusion: This study showed that the antinociceptive effect of the venom was mediated through central nervous system and peripheral mechanisms. Although details of the mechanism remain unclear, and further studies should be considered to demonstrate its therapeutic effects.
Fatemeh Sadat Seyedaghamiri, Narges Hosseinmardi, Mahyar Janahmadi, Azadeh Elahi Mahani,
Volume 18, Issue 9 (12-2015)
Abstract
Background: Considering the increased activity of hippocampal glial cells due to chronic morphine administration and the involvement of hippocampus in restoration of the addictive drug-associated experience, the role of these cells on morphine induced conditioned place preference (CPP) was investigated.
Materials and Methods: In this experimental study, four groups of animals were evaluated. After habituation to CPP apparatus on the first day, conditioning was done by injection of morphine (5 mg/kg) or its vehicle (saline) during three consecutive days. On the fifth day, the time spent in each compartment of CPP cage and locomotor activity was recorded for 20 min. To investigate the role of hippocampal glial cells in CPP, these cels were inbibited by bilaterally injecting fluorocitrate (1nmol/1ml), before each morphine injection. CPP testing in this group and animals received fluorocitrate vehicle (Phosphate buffer saline) was done before morphine injection.
Results: Fluorocitrate pretreatment reduced morphine induced conditioned place preference acquisition, so that a significant decrease was observed in conditioning score (unpaired t-test, p<0.01) in this group (n=8) compared to animals received morphine (n=9). Neither morphine nor fluorocitrate pretreatment did not affect locomotor activity (ANOVA, p>0.05).
Conclusion: The results suggest that glial cells in the hippocampus are involved in morphine induced conditioned place preference.
Yousef Panahi, Ehsan Sabori, Ali Rasouli, Goodarz Sadeghi Hashjin, Shiva Roshan Milani, Leila Derafshpour,
Volume 20, Issue 1 (4-2017)
Abstract
Abstract
Background: The aim of this study was to evaluate the effects of different concentrations of morphine and naloxone on epileptic activity in live brain slices taken from morphine-dependent and control infant mice.
Materials and Methods: Forty neonatal mice were randomly selected. To establish dependency, 2, 4, 8, 16 and 32 mg / kg morphine was injected subcutaneously once daily (0.1 cc) for 5 consecutive days from day 14-18 after birth. On postnatal days 19-20, brain slices were prepared and cerebrospinal fluid was perfused with low magnesium to induce experimental- epiletform activity. The effects of 10, 100 and 1000 µM concentrations of morphine and 10 µM naloxone were investigated on epileptic activity. Chenges in the number as well as onset and amplitude of activities were considered as an indicator to determine the quantity of their effect.
Results: The results showed that morphine 100 µM increased the activity while 10 and 1000 µM concentrations of morphine and 10 µM naloxone attenuated epileptic activity in both groups. Naloxone reduced pro-seizure effect of morphine, but anti-seizure effect of morphine couldn't restored by naloxone.
Conclusion: Morphine has a two-phase concentration-dependent effect on epileptic activity in the infant mice; so that low and high concentrations of morphine inhibit epileptic activity, but its moderate concentration potentiates the epileptic activity. Naloxone has an anti-seizure effect.
Marziyeh Tavassoli, Azam Alinaghipour, Abolfazl Ardjmand,
Volume 20, Issue 6 (9-2017)
Abstract
Abstract
Background: Learning and memory are among the higher functions of the brain. State-dependent memory (STM) is a type of memory in which the recall of a learned behavior is happend only in the same sensory and physiologic condition in which the behavior is encoded. The STM is seen with some drugs, e.g. the morphine. The pentylenetetrazol (PTZ) is a durg which is used for the induction of seizure in experimental models. Some studies have been revealed different effects of the PTZ on brain higher function (learning, memory …). The aim of present study was to explore the effect of PTZ on morphine-induced STM.
Materials and Methods: In this study, male adult Wistar rats (190-220 g) were used. Animals in 3 groups (n=8) during 3 sessions (learning/memory, STM and interaction) were studied. During 48 hour (training and test) the learning and memory of animals were studied in inhibitory avoidance apparatus. The step-through latency in the test day was used as a criterion for memory. Post-training injection of saline or morphine (2.5, 5 and 7.5 mg/kg-ip) in different groups was carried out. In addition, the pre-test injection of morphine at the same doses was made to study the STM. Moreover, the interaction of pre-test single-dose PTZ (60 mg/kg-ip) on STM was studied. The locomotion of the animals was measured using the open field.
Results: The post-training injection of morphine (2.5, 5 and 7.5 mg/kg-ip) impaired the inhibitory memory of rats compared to control group (p<0.001). The post-training and pre-test injections of the same dose of morphine (7.5 mg/kg-ip) reversed the impaired memory compared to morphine (2.5 and 5 mg/kg-ip), (p<0.001). The pre-test PTZ (60 mg/kg-ip) maintained the morphine (7.5 mg/kg-ip) STM (p<0.001).
Conclusion: The present study revealed that the post-training ip injection of different doses of morphine results in the impairment of inhibitory avoidance memory in rat. In addition, the pre-test injection of the same doses of morphine reverses the impaired memory. This process is called STM. Consequently, the pre-test injection of PTZ maintains the morphine STM.
Maryam Rahimi Tesiye, Farhad Valizadegan, Shahrbanoo Oryan,
Volume 22, Issue 1 (4-2019)
Abstract
Background and Aim: Working memory is a dynamic neural system for temporarily maintaining and processing of information. Prefrontal cortex (PFC) is the main processing center of Working memory by using different neurotransmitter systems communicate with other brain structures such as Basolateral Amygdala (BLA). In this study, we investigated the role of Opioidergic system in medial PFC and Dopaminergic system of BLA nucleus in working memory based on RAM test.
Materials and Methods: In this study, The male Wistar rats were used. Rats were cannulated with stereotaxic surgery in mPFC and BLA sites. After a recovery period, they were microinjected. Parameters such as working and reference memory errors were calculated with DSWS protocol.
Ethical Considerations: This study with research ethics code IR.UMZ.REC.1397.23 has been approved by Bioethics Committee at Mazandaran University, Iran.
Findings: High doses of Morphine (2 µg/rat) intra mPFC and Chloropromazine (2 µg/rat) intra BLA have improving effects on working and reference memory (p≤0.05). Low (0.005 µg/rat) and high dose (0.5 µg/rat) of Apomorphine had improving {(p≤0.05), (p≤0.01)} and the moderate dose (0.05 µg/rat) of it had decreasing effect on working and reference memory (p≤0.01). Microinjection of Morphine (0.5 µg/rat) with triple doses of Chloropromazine had no significant change on working and reference memory errors. Interaction of Morphine (0.5 µg/rat) with different doses of Apomorphine could change Apomorphine different effects. Coadministration of different doses of Apomorphine with effective dose of Chloropromazine (2 µg/rat) and Morphine (2 µg/rat) decreased the working and reference memory errors.
Conclusion: Our findings showed that in processing of working and reference memory, opioidergic system in mPFC and dopaminergic system in BLA, are interacting reciprocally.
Abbas Alimoradian, Saeed Pazhoohan, Omid Mirzabeygi, Kiana Naderinia,
Volume 23, Issue 6 (11-2020)
Abstract
Background and Aim: Opioid and benzodiazepine family drugs are concurrently used in various patients. Considering the respiratory depressant effects of both classes, in this study, we investigated the effect of coadministration of morphine and several widely used benzodiazepines in the clinic on the rate of respiratory depression in rats.
Methods & Materials: Seventy adult male Wistar rats were randomly divided into 10 groups; morphine, midazolam, diazepam, lorazepam, alprazolam, morphine-midazolam, morphine-diazepam, morphine-lorazepam, and morphine-alprazolam. Respiration signal was recorded using whole-body plethysmography 15 minutes after the intraperitoneal injection of the drugs. The respiratory pattern was examined using several parameters; the mean value of inter-breath interval and the respiratory rate, as well as the coefficient of variation and sample entropy analysis of inter-breath interval.
Ethical Considerations: This study was approved by the Ethics Committee of Arak University of Medical Sciences (Code: IR.ARAKMU.REC.1397.327).
Results: Analyzing respiratory data revealed that injecting the anxiolytic dose of alprazolam, and the combination of morphine-alprazolam and morphine-midazolam, altered the respiratory pattern. Such changes were associated with a decrease in the number of breaths and an increase in the inter-breath interval in the explored test animals, compared with the controls. The obtained data also indicated that morphine-midazolam injection increased the variability of the breathing pattern; such an alternation was associated with increased irregularity and decreased coefficient of variation of the inter-breath interval.
Conclusion: The present research results suggested that the short-term injection of morphine-midazolam changes the respiratory pattern more severely than morphine combined with other benzodiazepines.
