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Showing 3 results for Movahedi

Shohreh Movahedi, Mohammad Javan, Abolhassan Ahmadiani,
Volume 10, Issue 2 (Summer 2006)

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.
Hashem Haghdoost-Yazdi, Mohadeseh Movahedi, Ayda Faraji, Mohamad Sophiabadi,
Volume 15, Issue 2 (Summer 2011)

Introduction: β-carbolines (BCs) are heterocyclic indole alkaloids found in human body, grilled meat, alcoholic beverages and tobacco smoke. Based on the present reports, there are controversies about the role of these compounds in the pathophysiology of Parkinson' disease (PD). The aim of this study was to investigate the effect of norharman, a BC, in the prevention, exacerbation or creation of PD in 6-hydroxydopamine (6-OHDA) rat model. Methods: In the first part of this study, PD was established in rats by stereotaxic injection of 6-OHDA into the striatum. At the 2nd and 4th weeks post-surgery, apomorphine-induced rotational test was performed. Just before the surgery to the 4th week, after that rats received i.p. daily injections of norharman or its solvent at different doses. In the second part of the study, other groups of rats received daily intraperitoneal injections of norharman at different doses without prior injections of 6-OHDA. Fifteen and 30 days after the beginning of the injections, apomorphine-induced rotational and elevated body swing tests were performed. Results: In the 6-OHDA-induced Parkinsonism rats, daily injection of norharman at doses of 200 and 1000, but not 100 μg/kg, significantly increased apomorphine-induced rotations compared to the control group at the 4th week postsurgery. In the intact rats, daily injection of norharman at doses of 200, 500 and 1000 μg/kg could not produce any PD symptoms in the apomorphine-induced rotational and elevated body swing tests. Conclusion: Longtime exposure to BCs can exacerbate PD but it cannot create the disease.
Vahid Pirhajati Mahabadi, Mansoureh Movahedin, Zohreh Mazaheri, Saeed Semnanian, Javad Mirnajafi_zadeh, Mehrdad Faizi,
Volume 19, Issue 1 (March 2015)

Introduction: Noradrenergic cells in LC participate in the process of cortical activation and behavioral arousal. The evidence suggests that locus ceoruleus (LC) plays an important role in the sleep-wake cycle. The aim of this study was stereological estimation of cavity caused by lesion and assessment of sleep stages after bilateral lesion of the LC. Materials and Methods: Male Wistar rats weighting 250-275 gr were divided into four groups (control: n=6, sham: n=6, lesion1: n=6 and lesion2: n=6). 6 hydroxydopamine (6 OHDA) (2μg/0.5μl and 4μg/1μl) was sterotaxically injected bilaterally into LC to produced lesion. For sleep recording 3 EEG and 2 EMG electrodes were implanted respectively in the skull and dorsal neck muscle. Recordings were taken before and 7, 21 and 42 days after lesion. After 7 weeks, Rats first were anesthetized and then their brains were removed and cut in 7 μm serial sections and stained with cresyl violet. The volume of LC and the lesion induced cavity were evaluated through the stereological technique. Results: Lesion - induced cavity volume (0.5 μl) was restricted to LC, whereas Another group (1 μl), total LC and structures adjacent to the LC were also damaged. A significant decrease was seen in non-rapid eye movement (NREM) and paradoxical sleep (PS) stages and a significant increase was seen in duration of wake and paradoxical sleep without atonia (PS-A) in lesion group in comparison with control and sham groups. Conclusion: The results of this study demonstrate 2μg/0.5μl 6-OHDA is suitable dose for LC lesion and bilateral lesion of LC causing disrupt wake, NREM ,PS and also produce the PS-A.

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