OTHERS_CITABLE
Editorial
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2014-05-15
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89
Tara
Dehpour
1
AUTHOR
Mani
Ali Reza
2
AUTHOR
Shahram
Ejtemaeimehr
3
AUTHOR
Dehpour
Ahmad Reza
4
AUTHOR
OTHERS_CITABLE
Effect of phasic electrical locus coeruleus stimulation on inhibitory and excitatory receptive fields of layer V barrel cortex neurons in male rat
Introduction: It is believed that Locus Coeruleus (LC) influences the sensory information processing. However, its role in cortical surround inhibitory mechanism is not understood. In this experiment, using controlled mechanical displacement of whiskers we investigated the effect of phasic electrical stimulation of LC on response of layer V barrel cortical neurons in anesthetized rat. Methods: LC was stimulated 0, 50, 100, 200 and 400ms before principal or adjacent whiskers deflection. For assessing the effect of LC stimulation on inhibitory receptive field of the barrel neurons, adjacent whisker was also deflected 20ms before principal whisker deflection, and LC stimulation was applied 0-400ms before principal whisker displacement. Results: We found that LC stimulation increased the response magnitude of layer V neurons to principal whisker deflection (significance level (p<0.05) at 50-400ms intervals). This increase in response magnitude was observed to adjacent whisker deflection too (significant (p<0.01) at 100ms interval). The response latency of neurons was decreased when LC was stimulated 400ms before principal whisker deflection (p<0.01). LC stimulation did not affect the neuronal response latency to adjacent whisker displacement or spontaneous activity of neurons. Inhibitory effect of adjacent whisker deflection on neuronal response magnitude was increased by LC stimulation when tested when combined whisker displacement. Conclusion: These findings suggest that LC by modulating the neuronal responses enhances the neuronal responsiveness to sensory stimuli and increases their surround inhibition in cortex.
http://ppj.phypha.ir/article-1-245-en.pdf
2014-05-15
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97
Somatosensory cortex
Locus coeruleus
Electrical stimulation
Barrel cortex.
Vahid
Sheibani
Vsheibani2@yahoo.com
1
aKerman Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran
AUTHOR
Sahel
Motaghi
2
AUTHOR
Rasool
Farazifard
3
AUTHOR
Hossein
Joneidi
4
AUTHOR
Mohammad reza
Afarinesh
5
AUTHOR
OTHERS_CITABLE
Spasmolytic effect of Anethum graveolens (dill) fruit extract on rat ileum
Introduction: Dill (Anethum graveolens), a herb from from Umbelliferae, is used traditionally to treat convulsion and increasing milk production. Its antimicrobial, antihyperlipidaemic, anti-hypercholesteroaemic effects and gastric acid secretion reducing effect have been reported. The spasmolytic effect of dill fruit on rat uterus has also been shown recently. The aim of present study was to investigate the effects of dill fruit hydroalcoholic (DFHE) extract on rat ileum contractions induced by KCl (60mM), acetylcholine (1μM) and BaCl2 (4mM). Methods: Dill fruit was extracted by 70 % alcohol for 72 h and macerated method was used. Male Wistar rats were killed by a blow to head and pieces of end portion of ileum (2 cm) were dissected out and washed with cooled oxygenated Tyrode’s solution. Ileum was mounted in an isolated organ bath containing Tyrode solution (37 ºC) bubbled by air. An isotonic transducer was used to record contractile responses under 0.5g initial tension. Results: The cumulative concentrations of DFHE (0.5, 1, 2, and 4 mg/ml) relaxed the KCl- , acetylcholineand BaCl2-induced contractions dose-dependently (n=8, p<0.0001). This spasmolytic effect of extract (at all concentrations) on BaCl2-induced contraction was more potent than on the acetylcholine-induced contraction. In addition, the antispasmodic effect of DFHE was reversible after washing the organ bath. The inhibitory effect of extract (1mg/ml) on contraction induced by KCl was unaffected neither by phentolamine (1 μM, for 30 min), propranolol (1 μM, for 30 min) nor naloxone (1 μM, for 30 min). L-NAME (100 μM, for 20 min) was also ineffective in this respect. In Ca2+-free, rich K+ (120 mM) Tyrode solution, cumulative adding of calcium (0.225. 0.45, 0.9, 1.8 and 3.6 mM), increased contractions dose dependently (p<0.0001). DFHE (1 mg/ml) shifted this dose-response curve to the right (p<0.0001). Conclusion: These results suggest that the relaxatory effect of DFHE on ileum contractions is due to the blockade of voltage dependent calcium channels. In addition, the α- and β-adrenoceptors, opioid receptors and NO production are not involved in this inhibitory effect of DFHE.
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2014-05-15
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105
Anethum graveolens
Rat
Ileum
Voltage-dependent calcium channels
Mohammad Kazem
Gharib Naseri
gharibnaseri_m@yahoo.com
1
AUTHOR
Akbar
Haeidari
2
AUTHOR
OTHERS_CITABLE
Study on the possible similar mechanism of ultra low dose-induced hyperalgesia and development of tolerance to analgesia in male rats: an study based on the role of Gs signaling pathway
Introduction: Ultra low dose (ULD) morphine induces hyperalgesia which is mediated by excitatory Gscoupled
opioid receptors. This study was designed to investigate the development of tolerance to hyperalgesic
effect of morphine. Also we attempt to seek possible similarity, in view of Gs proteins, between hyperalgesic
effect of ULD and hyperalgesic effect after tolerance to HD.
Method: Male Wistar rats weighing 180-220 g were used. All injections were given intra peritoneally. For
tolerance induction animals received ULD or HD for 5 days and at the 6th day tail flick test was performed before
and 30 min after morphine administration. Effect of pretreatment with ULD on analgesic tolerance was assessed
by injection of ULD before HD in 5 consecutive days then TF record was done after HD injection on 6th day. Time
interval between injections was 15 minutes. Cross tolerance assay was measured by recording the response to a
specified dose in 6th day after 5 days treatment with another dose. Oseltamivir, as a GM1 ganglioside inhibitor,
was used for inhibition of Gs signaling. .
Results: Our results showed that: 1) tolerance was established after chronic injection of ultra low dose (ULD)
of morphine. 2) Pre-treatment by ULD reduced tolerance to therapeutic dose of morphine. 3) Cross tolerance to
analgesia was observed after chronic administration of ULD. 4) Combination therapy with oseltamivir blocked
hyperalgesia reduced analgesic tolerance and attenuated the development of tolerance to hyperalgesic effect of
morphine.
Conclusion: The results showed the partially common mechanism for development of tolerance to hyperalgesic
and analgesic effect of morphine. Signaling through Gs proteins seems to be a common pathway.
http://ppj.phypha.ir/article-1-265-en.pdf
2014-05-15
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114
Tolerance
Morphine
Hyperalgesia
Analgesia
Gs proteins
Oseltamivir.
Shohreh
Movahedi
1
AUTHOR
Mohammad
Javan
2
AUTHOR
Abolhassan
Ahmadiani
aahmadiani@yahoo.com
3
AUTHOR
OTHERS_CITABLE
Assessment of the role of NMDA receptors located in hippocampal CA1 area on the effects of oral morphine dependency on spatial learning and memory in rat
Introduction: It has been reported that oral morphine dependency facilitated formation of spatial learning
and memory. In the present study the role of NMDA receptors located in hippocampal CA1 area of morphine
dependent rats was studied.
Methods: Male rats were divided into 4 groups. Two cannulae were stereotaxically implanted bilaterally
into the hippocampal CA1 area. After 5 days recovery, animals received morphine sulfate or sucrose for 30
consecutive days in drinking water. Morris water maze (MWM) studies were performed from day 26 to 30. In the
above mentioned days, animals received bilateral intrahippocampal CA1 area injection of 3.7μg/0.5μl D,L-AP5
(NMDA receptors antagonist) or 0.5μl saline, 30 min before daily experimentation. Spatial learning and memory
parameters were subjected to the analysis of variance (ANOVA).
Results: Morphine dependence potentiated spatial learning and memory parameters using MWM. D,L-AP5
could inhibit formation of spatial learning and memory in both control and dependent group.
Conclusion: Activation of NMDA receptors located in hippocampal CA1 area is essential for potentiation of
spatial learning and memory in morphine dependence rats.
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2014-05-15
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123
Morris Water Maze
NMDA receptors
Oral morphine dependency
Spatial learning and memory
Hippocampal CA1 area.
Ali
Pourmotabbed
apourmotabbed@yahoo.com
1
AUTHOR
Seyed Ershad
Nedaei
2
AUTHOR
Entezar
Mehrabinasab
3
AUTHOR
OTHERS_CITABLE
The effect of Fibroblast Growth Factor-2(FGF-2) and retinoic acid on differentiation of mouse embryonic stem cells into neural cells
Introduction: Embryonic Stem (ES) cells as pluripotent cells derived from the inner cell mass of blastula can
differentiate to neural cells in vitro and this property is valuable in studies of neurogenesis and in the generation
of donor cells for transplantation. In this regard, the propose of this research, was the study of the role of two
important factors in the development of neural system, Fibroblast Growth Factor and Retinoic Acid were used in
the study of mouse ESCs differentiation into neural cells.
Methods: Royan B1 ESCs were used in this experiment. The formation of embryoid bodies (EBs) within
2days was the key indication of the differentiation process and then the treatment was carried out under the
influence of different factors for example retinoic acid and fibroblast growth factor-2 within 4days in cell culture
media in 6 groups and finally the EBs were transferred on poly-L-lysine coated dishes within 5 days to promotes
the differentiation.
Results: The Studying of β-tubulin III, as a marker of neural cells, in neural cells derived from the ESCs
used immunocytochemistry method, and the results obtained from statistical analysis of the percentage of neural
differentiated colonies, revealed that, retinoic acid is a strong inducer factor which caused the differentiation of
ESCs into neural cells and under the influence of combination of fibroblast growth factor and retinoic acid, ESCs
differentiated to the neural cells with longer and thicker outgrowth.
Conclusion: This experiment showed that under the influence of fibroblast growth factor-2 and retinoic acid
there is a possibility to generate an efficient and large numbers of neurons with longer and thicker outgrowth like
motor neurons of spinal cord of posterior area which an suitable for transplantation in damaged spinal cord.
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Mouse Embryonic Stem Cells (mESCs)
Fibroblast Growth Factor 2(FGF-2)
Retinoic Acid (RA)
Embryoid Bodies (EBs)
Neurogenesis.
Reza
Moghadasali
rezamoghadasali@yahoo.com
1
AUTHOR
Hossein
Baharvand
2
AUTHOR
Bahman
Zeynali
3
AUTHOR
Masoud
Soleimani
4
AUTHOR
OTHERS_CITABLE
Olanzapine antagonizes the acquisition and expression of morphine-induced conditioned place preference in male and female mice
Introduction: Several investigations have indicated that dopamine D
receptors could influence morphine
2
eward. The influence of olanzapine (a D
dopamine receptor antagonist) on the morphine-induced conditioned
2
lace preference (CPP) in male and female mice was investigated in the present study.
Methods: The effects of olanzapine on the acquisition and expression of morphine CPP in male and female
-MRI mice (W: 20-25 g) were investigated in the present study.
Resultd: Subcutaneous (s.c.) injection of morphine (1-10 mg/kg, three drug sessions) induced place preference
oth in male and female mice. Intraperitoneal (i.p.) administration of olanzapine (0.5-5 mg/kg) induced place
version (CPA) in female mice but not in male mice. Administration of olanzapine (1, 2.5, 5 mg/kg, i.p.) reduced
oth the acquisition and expression of morphine-induced CPP in male and female mice. However, olanzapine (5
g/kg, i.p.) caused more than 80% mortality in female but not male mice. The effects of olanzapine were reversed
y L-arginine (20 mg/kg, i.p.) pre-administration.
Conlusion: We conclude that olanzapine reduced morphine effects via different mechanism/s.
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2014-05-15
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142
Morphine; Olanzapine; Place preference; Nitric oxide; Mice.
Parivash
Hafez-Amini
1
AUTHOR
Jamal
Shams
2
AUTHOR
Ali
Shabahng-Saber-Tehrani
3
AUTHOR
Ali
Haeri-Rohani
4
AUTHOR
Kazem
Parivar
5
AUTHOR
Vahab
Babapour
6
AUTHOR
Hedayat
Sahraei
h.sahraei@bmsu.ac.ir
7
AUTHOR
OTHERS_CITABLE
Valuation of Origanum vulgare (leaves, stems and flowers) extract on spatial learning in male rats
Introduction: Origanum vulgare a rich source of natural phenolic antioxidants and has potential to be a source
nutritional ingredients for functional food. Herbs such as Origanum have long been used in food preservation
d in traditional medicine in the treatment of common ailments and have potential for positive modulation
oxidation-linked diseases such as diabetes. Here we investigated the effect of aqueous extract of Origanum
aves, stems and flowers) on spatial learning.
Methods: After scientific identification, the leaves were used for extraction. 35 adult NMRI male rats weighing
0-350 gr were utilized in 5 groups. Control group (no injection), the second group (saline injected), the extracts
h different doses (150, 300, 450) mg/kg were injected intraperitoneally to experimental animals. All animals
re trained for a spatial learning task using T-maze and were then trained subsequently daily based on standard
thod.
Results: Statistic analysis ANOVA showed that Origanum aqueous extract significantly decreased the number
learning and error in simple and reverse learning (p<0.05) and it had no significant effect on delay time in both
e of learning.
Conclusion: It can be concluded that the effect of Origanum extract on learning can be due to its antioxidant
d presence of anti acetylcholine estrase compounds such as ursolic acid.
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150
Medicinal plant; Origanum vulgare; Spatial learning; T-maze.
Mehdi
Abbasnejad
mabbas@mail.uk.ac.ir
1
AUTHOR
Mansour
Mirtajadini
2
AUTHOR
Mohammad Reza
Afarinesh
3
AUTHOR
Neda
Hassibi
4
AUTHOR
OTHERS_CITABLE
The effect of spinal skin cooling with topical ointment on the recruitment curve parameters of soleus H-reflex
Introduction : There are different applications for cooling in rehabilitation and there is also a controversy in
results of applying ice on limb and its effects on motorneurons excitability.
Methods : This study was done to determine the effect of applying controlled cooling (rubbing cold ointment
with 3°C temperature) on the spinal skin (around T
place of S root nerve) on the excitability of soleus
11, 11
motorneurons in ten healthy, non-athletic men. Each volunteer was tested in two [control (vazeline ointment with
-
environment temperature) and examination (cold vazeline)] separate sessions. We used soleus H-reflex and M
h
wave recruitment curve parameters for evaluation. Stimulation current was a square pulse with 700 microsecond
duration and 0.2 Hz frequency. H-reflex was recorded with 9 different amplitudes.
Results: Fit L
slope, fit L slope and peak to peak amplitude of H-reflex decreased immediately and 30
3 5
minutes after the application of cold ointment.
Conclusion: Cold by stimulating the thermoreceptors and reducing the firing rate of surface mechanoreceptors
can decrease the excitability of motoneurons and this effect may be long lasting.
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157
Recruitment curve
H-reflex
cold
soleus
Motoneuron activity.
Hossein
Salehi
1
AUTHOR
Giti
Torkaman
torkamg@modares.ac.ir
2
AUTHOR
Seyed Mohammad
Firoozabadi
3
AUTHOR
OTHERS_CITABLE
Comparison of the effects of ethinyl estradiol and genistein on serum lipids and lipoproteins of hypercholestrolemic male rats
Introduction: Estrogen is one of the female sex hormones that in addition to its reproductive role, has favorable
fects on the metabolism of blood lipids and lipoproteins and by this way decreases the coronary heart disease.
n the other hand, phytoestrogens are phytochemical substances that have effects like estrogens. Isoflavones,
hich the most important of them is genistein, are the most common form of phytoestrogens. In this research, the
fects of one phytoestrogenic compounds named genistein and one estrogenic compound named ethinyl estradiol
ere compaired. The purpose of this comparison was to study of replacement possibility of phytoestrogens in
RT period for elimination of side effects of estrogenic compound.
Methods: First the rats were fed for 2 months with high cholestrol diet (2% cholestrol, 0/5% cholic acid).
fter the first blood test ensured the hypercholestrolemic condition, the rats were treated for 2 months with ethinyl
stradiol and genistein besides of high cholestrol diet. After the end of the second period and serum preparation
om the blood samples disignated total cholestrol, triglyceride, HDL, LDL and VDL were measured and the
sults were statistically analyzed.
Results: According to the obtained results of the first period of experiment, the usage of high cholestrol diet
aused meaningful increase in total cholestrol and LDL as it made rats hypercholestrolemic. According to the
sults of second period of experiment, the usage of ethinyl estradiol reduced the level of serum total cholestrol
nd LDL of hypercholestrolemic rats, that was because of the effect of estrogen on increase of LDL catabolism.
hereas, it did not produce meaningful changes in triglyceride, HDL and VDL. Usage of genistein in isolated
rm had no benefical effect on blood lipids and lipoproteins, Because hypocholestrolemic property of isoflavone
epends on matrix that is beside it.
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164
Estrogen
Phytoestrogen
Lipids and lipoprotein
Rat.
Shohreh
Iranmanesh
1
AUTHOR
Akbar
Vahdati
avahdatim@yahoo.com
2
AUTHOR
Taji
Afrouz
3
AUTHOR
OTHERS_CITABLE
An evidence for a potassium channel in endoplasmic reticulum based on single channel recording in bilayer lipid membrane
Introduction Numerous studies have demonstrated the presence of potassium selective channels in membranes
internal organelles. These channels are essential to a large variety of cellular processes including intracellular
2+
a
signaling, protein recycling, charge neutralization and cell protection. In contrast to the sarcoplasmic reticulum
+
here potassium channels have been clearly identified, there is little evidence for K
selective cannels in RER
hepatocytes. The aim of this study is to find an evidence for presence of potassium channel in endoplasmic
ticulum and considering the pharmacological and biophysical properties of this channel.
Methods: Hepatocytes RER vesicles were isolated by homogenizing rat liver followed by several centrifuging
eps and then incorporated into the bilayer lipid membrane (BLM). The BLM was formed by painting
osphatidylcholine across the 350 ?m aperture seperating two chambers (cis chamber containing 200 mM KCl
+
d trans chamber containing 50 mM KCl). Single channel recordings were used to indicate the presence of K
annels.
Results: Single channel recordings revealed the existence of a cation selective channel with high permeability
+
K
and 599 pS conductance. The current–voltage relation was linear. The open probability was strongly voltage
pendent, showing higher values at positive voltages and lower at negative voltages. A subconductance state
out 60 % of fully open state was observed at all voltages. The cationic channel showed an inhibition by 4-
+
innopyridine (non specific K
channel blocker)
+
Conclusions: In this study we have established an evidence for existence of large conductance K
channel in
e hepatocyte ER vesicles.
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171
hepatocyte
endoplasmic reticulum
BLM
single channel recording
K