Mahmoud Ghazi-khansari - Academia.edu (original) (raw)

Papers by Mahmoud Ghazi-khansari

ACS Chemical Neuroscience

European Journal of General Medicine

Aim: one hundred urine samples of abusers were examined for the presence of alkaloid substances i... more Aim: one hundred urine samples of abusers were examined for the presence of alkaloid substances in urine. Alkaloids of urine were confirmed with rapid and TLC methods. A thin-layer chromatography (TLC) procedure for the screening and confirmation of urinary codeine and morphine has been developed. Method: Urine samples were daily collected from abusers of Tabriz/ Iran. Urine extracts were prepared using silica-gel absorbent resin in column. The resin was rinsed with two buffers. These procedures make PH appropriation, then residual water was removed by vacuum aspiration and adsorbed alkaloid substances were eluted with a organic solvent of methanol and concentrated. After evaporation to dryness with heater, the residue was dissolved in organic solvent of methanol to reach 10 to 40 fold concentration. For screening, the extraction residues were spotted on TLC plates which are developed in chloroform: methanol: Ammoniac (12:1.4:0.2). For confirmation the spots for the two opioids were visualized with acidified iodoplatinate. Codeine and morphine standards are well separated from one another and comparison with samples urinary substances on plates. The limit of detection was a concentration of 300ng/mL. Result: The result of this study has shown that 100 percent of urine samples from addicted in Tabriz (Iran) were contained alkaloid substances and 25 percent of these samples have shown drug interaction. Conclusion: This study describes importance of urine drug testing such as TLC analysis in comparison of other rapid tests.

Journal of Cellular Physiology

Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, Jan 12, 2018

Despite growing evidence for the potential teratogenicity of nitrate, knowledge about the dose-re... more Despite growing evidence for the potential teratogenicity of nitrate, knowledge about the dose-response relationship of dietary nitrate intake and risk of specific birth defects such as neural tube defects (NTDs) is limited. Therefore, the aim of this meta-analysis was to synthesize the knowledge about the dose-response relation between maternal dietary nitrate intake and the risk of NTDs. We conducted a systematic search in PubMed, ISI Web of Science and Scopus up to February 2018 for observational studies. Risk ratios (RRs) and 95% confidence intervals (95% CI) were calculated using a random-effects model for highest versus lowest intake categories. The linear and non-linear relationships between nitrate intake and risk of NTDs were also investigated. Overall, 5 studies were included in the meta-analyses. No association was observed between nitrate intake and NTDs risk in high versus low intake (RR: 1.33; 95% CI: 0.89-1.99, p = 0.158) and linear dose-response (RR: 1.03; 95% CI: 0....

Drug metabolism and personalized therapy, Jun 27, 2018

Seizure is one of the important symptoms of tramadol poisoning, but its causes are still unknown.... more Seizure is one of the important symptoms of tramadol poisoning, but its causes are still unknown. The aim of this study is to find a relationship between tramadol and the concentrations of its metabolites versus the incidence of seizures following the consumption of high doses of tramadol. For this purpose, the blood samples of 120 tramadol-intoxicated patients were collected. The patients were divided in two groups (seizure and non-seizure). The concentrations of tramadol and its metabolites (M1, M2 and M5) were measured by using a high-performance liquid chromatography method. The relationship between tramadol and the levels of its metabolites and seizure incidences was also investigated. In 72% of the patients, seizures occurred in the first 3 h after the ingestion of tramadol. The seizure incidences were significantly correlated with the patients' gender, concentrations of tramadol, M1 and M2 and the history of previous seizures (p<0.001). The average concentration of M2 ...

Acta medica Iranica, 2017

Aflatoxin B-1 (AFB1) is one of the major mycotoxins causing food contamination. Previous studies ... more Aflatoxin B-1 (AFB1) is one of the major mycotoxins causing food contamination. Previous studies have shown that AFB1 can induce carcinogenicity and toxic effects in the isolated perfused rat liver and these effects are associated with its metabolites and peroxidation activity. Here we surveyed whether these pathogenic effects of AFB1 are associated with TNF-α as an inflammatory cytokine in general liver damages. In this study, we used twenty male Wistar rats (250-300 g). Rats were divided into four groups. Control group was pre-treated with LPS and then perfused with KHBB. The second group was pretreated with PTX and LPS and then perfused with KHB. The third group was pre-treated with LPS and then perfused with AFB-1 and KHB. The last group was pretreated with LPS and PTX and then perfused with AFB1 and KHB. Results revealed that aflatoxin B1 significantly increased the enzyme activity of aminotransferase and levels of lipid peroxidation. Also, the levels of Glutathione decreased i...

Iranian journal of basic medical sciences, 2017

Rapamycin is an immunosuppressant compound with a broad spectrum of pharmaco-logical activities. ... more Rapamycin is an immunosuppressant compound with a broad spectrum of pharmaco-logical activities. In recent years, it has been used successfully to decrease ischemia-reperfusion injury in several organ systems. The purpose of the present study was to examine the effect of rapamycin on testicular ischemia-reperfusion injury. Seventy-two adult male Wistar rats were divided into six groups: control (group1), sham-operated (Group2), T/D + DMSO as vehicle group (group3), and groups 4-6; respectively received 0.5, 1, and 1.5 mgkgof rapamycin, IP 30 min before detorsion. Ischemia was achieved by twisting the right testis 720° clockwise for 1 hr. The right testis of 6 animals from each group were excised 4 hr after detorsion for the measurement of lipid peroxidation, caspase-3, and antioxidant enzyme activities. Histopathological changes and germ cell apoptosis were determined by measuring mean of seminiferous tubules diameters (MSTD) and TUNEL test in right testis of 6 animals per group, 24...

Journal of Molecular Liquids

Journal of Separation Science

An approach involving ion-pair switchable-hydrophilicity solvent-based homogeneous liquid-liquid ... more An approach involving ion-pair switchable-hydrophilicity solvent-based homogeneous liquid-liquid microextraction coupled to high-performance liquid chromatography has been applied for the preconcentration and separation of paraquat in a real sample. A mixture of triethylamine and water was used as the switchable-hydrophilicity solvent. The pH was regulated using carbon dioxide; hence the ratio of the ionized and non-ionized form of triethylamine could control the optimum conditions. Sodium dodecyl sulfate was utilized as an ion-pairing agent. The ion-associate complex formed between the cationic paraquat and sodium dodecyl sulfate was extracted into triethylamine. The separation of the two phases was carried out by the addition of sodium hydroxide, which changed the ionization state of triethylamine. The effects of some important parameters on the extraction recovery were investigated. Under the optimum conditions (500 μL of the extraction solvent, 1 mg sodium dodecyl sulfate, 2.0 mL of 10 mol/L sodium hydroxide, and pH 4), the limit of detection and the limit of quantification were 0.2 and 0.5 μg/L, respectively, with preconcentration factor of 74. The precision (RSD, n = 10) was &amp;lt;5%. The recovery of the analyte in environmental and biological samples was in the range of 90.0-92.3%.

Scientific reports, Jan 15, 2017

Catecholamine neurotransmitters, generally including dopamine (DA), epinephrine (EP) and norepine... more Catecholamine neurotransmitters, generally including dopamine (DA), epinephrine (EP) and norepinephrine (NE) are known as substantial indicators of various neurological diseases. Simultaneous detection of these compounds and their metabolites is highly recommended in early clinical diagnosis. To this aim, in the present contribution, a high performance colorimetric sensor array has been proposed for the detection and discrimination of catecholamines based on their reducing ability to deposit silver on the surface of gold nanorods (AuNRs). The amassed silver nanoshell led to a blue shift in the longitudinal localized surface plasmon resonance (LSPR) peak of AuNRs, creating a unique pattern for each of the neurotransmitters. Hierarchical cluster analysis (HCA) and linear discriminate analysis (LDA) pattern recognition techniques were employed to identify DA, EP and NE. The proposed colorimetric array is able to differentiate among individual neurotransmitters as well as their mixtures...

Scientific reports, Jan 6, 2017

Epithelial ovarian cancer (EOC) is the most fatal gynaecological malignancy. Despite initial ther... more Epithelial ovarian cancer (EOC) is the most fatal gynaecological malignancy. Despite initial therapeutic response, the majority of advanced-stage patients relapse and succumb to chemoresistant disease. Overcoming drug resistance is the key to successful treatment of EOC. Members of vascular endothelial growth factor (VEGF) family are overexpressed in EOC and play key roles in its malignant progression though their contribution in development of the chemoresistant disease remains elusive. Here we show that expression of the VEGF family is higher in therapy-resistant EOC cells compared to sensitive ones. Overexpression of VEGFR2 correlated with resistance to cisplatin and combination with VEGFR2-inhibitor apatinib synergistically increased cisplatin sensitivity. Tivozanib, a pan-inhibitor of VEGF receptors, reduced proliferation of the chemoresistant EOC cells through induction of G2/M cell cycle arrest and apoptotic cell death. Tivozanib decreased invasive potential of these cells, c...

Neuroscience, Aug 7, 2016

Amphetamine withdrawal (AW) is accompanied by diminished pleasure and depression which plays a ke... more Amphetamine withdrawal (AW) is accompanied by diminished pleasure and depression which plays a key role in drug relapse and addictive behaviors. There is no efficient treatment for AW-induced depression and underpinning mechanisms were not well determined. Considering both transient receptor potential cation channel, subfamily V, member 1 (TRPV1) and N-Methyl-d-aspartate (NMDA) receptors contribute to pathophysiology of mood and addictive disorders, in this study, we investigated the role of TRPV1 and NMDA receptors in mediating depressive-like behaviors following AW in male mice. Results revealed that administration of capsaicin, TRPV1 agonist, (100μg/mouse, i.c.v.) and MK-801, NMDA receptor antagonist (0.005mg/kg, i.p.) reversed AW-induced depressive-like behaviors in forced swimming test (FST) and splash test with no effect on animals' locomotion. Co-administration of sub-effective doses of MK-801 (0.001mg/kg, i.p.) and capsaicin (10μg/mouse, i.c.v) exerted antidepressant-lik...

$Research paper thumbnail of A semipolar fraction of petroleum ether extract of Artemisia aucheri induces apoptosis and enhances the apoptotic response to doxorubicin in human neuroblastoma SKNMC cell line$

Research in pharmaceutical sciences

Artemisia is an important genus of Iranian flora whose potent anti-proliferative effect has been ... more Artemisia is an important genus of Iranian flora whose potent anti-proliferative effect has been demonstrated previously on human cancerous cell lines. In the current study, further fractionation was carried out on the petroleum ether extract of A. aucheri and their cytotoxic effects were evaluated on three human cancer cell lines. Cell viability was determined by 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyltetrazolium bromide assay. Real time polymerase chain reaction (RT-PCR) was used to evaluate the expression of apoptotic related genes. Activation of caspases and detection of intracellular doxorubicin (DOX) accumulation were evaluated using a spectrophotometer. Mitochondrial membrane potential (MMP) was measured using flow cytometry. The fraction NO-7 (F7) of petroleum ether extract showed the highest anti-proliferative effect, especially against SKNMC cells. Therefore, we focused on a description of the cytotoxic mechanism of the most potent fraction on SKNMC cells. The results ind...

Brain Research Bulletin, 2016

Experiencing psychosocial stress in early life, such as social isolation stress (SIS), is known t... more Experiencing psychosocial stress in early life, such as social isolation stress (SIS), is known to have negative 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 (0.05mg/kg) and ketamine (0.5mg/kg), reversed the proconvulsant effects of SIS in Isolated (and not social) housed animals. Co-administration of non-effective doses of nitric oxide synthase (NOS) inhibitors, 7NI (25mg/kg) and L-NAME (10mg/kg), with NMDA receptor antagonists, MK-801 (0.01mg/kg) and ketamine (0.1mg/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 pathway.

Journal of the American Geriatrics Society, 1996

Toxicology Letters, 2006

مقدمه: هدف از اين مطالعه نشان دادن توانايي كاپتوپريل به عنوان يك داروي تيولدار مهاركنندة آنزيم مب... more مقدمه: هدف از اين مطالعه نشان دادن توانايي كاپتوپريل به عنوان يك داروي تيولدار مهاركنندة آنزيم مبدل آنژيوتانسين در جلوگيري از سميت ناشي از پاراكوات درميتوكندريهاي جدا شده از كبد رت ميباشد. روش: در اين مطالعه ابتدا ميتوكندريهاي كبد موش صحرايي به وسيله سانتريفوژ ...

Studies in Surface Science and Catalysis, 2004

The purpose of this study was to find a relatively inexpensive method for removal of arsenate and... more The purpose of this study was to find a relatively inexpensive method for removal of arsenate and arsenite from drinking water. The capability of Iranian natural clinoptiloiites, relevant synthetic zeolites A and P and Iron(n) modified of them was investigated for the uptake of arsenic anions from drinking water. Data obtained from ion-exchange using batch (static) technique showed that among the investigated zeolites, modified synthetic zeolite A was the most selective sorbent for removal of arsenic. In this study the influencing of factores including temperature, concentration, pH, and particle size was determined or studied on removal of arsenic species.

Iranian journal of pharmaceutical research : IJPR, 2013

Arsenic exposure mainly through food and water has been shown to be associated with increased inc... more Arsenic exposure mainly through food and water has been shown to be associated with increased incidence of numerous cancers and non-cancer harmful health. It is also used in cancer chemotherapy and treatment of several cancer types due to its apoptogenic effects in the various cancer and normal cell lines. We have already reported that liver is the storage site and important target organ in As (III) toxicity and recently, it has been suggested that hepatic toxicity of arsenic could be resulted from impairment of the liver mitochondria. In this study, interaction of As (III) with freshly isolated rat mitochondria was investigated. We determined different mitochondrial toxicity factors as well as mitochondrial sources of ROS formation using specific substrates and inhibitors following addition of As (III) to the mitochondria. Our results showed that arsenic (III) increased mitochondrial ROS formation, lipid peroxidation and mitochondrial membrane potential collapse, cytochrome c relea...

The international journal of occupational and environmental medicine, 2013

The isocyanates are widely used as precursors of polyurethane products, as well as carbamate inse... more The isocyanates are widely used as precursors of polyurethane products, as well as carbamate insecticides. Toluene 2,4-diisocyanate (TDI) is one of the most important commercially used isocyanates. Humans may be exposed to TDI by inhalation, ingestion, dermal and eye contact. TDI is a powerful irritant to the mucosal membranes of the gastrointestinal and respiratory tracts, eyes and the skin. Pulmonary manifestations, especially occupational asthma, are the predominant manifestations after TDI toxicity. Herein, we present intestinal obstruction as an extraordinary manifestation of acute TDI toxicity after occupational exposure. TDI toxicity may cause intestinal obstruction.