کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4347916 | 1615178 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: 3-Nitropropionic acid-induced depression of spinal reflexes does not involve 5-hydroxytryptaminergic system in contrast to ischemia-induced depression in neonatal rat spinal cord in vitro 3-Nitropropionic acid-induced depression of spinal reflexes does not involve 5-hydroxytryptaminergic system in contrast to ischemia-induced depression in neonatal rat spinal cord in vitro](/preview/png/4347916.png)
The involvement of 5-hydroxytryptaminergic (5-HTergic) system for the 3-nitropropionic acid (3-NPA)-induced depression of spinal reflexes was evaluated and compared with other energy deficiency condition (ischemia; glucose-free and O2-free). The monosynaptic (MSR) and polysynaptic reflex (PSR) potentials were recorded at ventral root by stimulating the corresponding dorsal root in neonatal rat spinal cord in vitro. Superfusion of 3-NPA (3.4 mM) or ischemic solution depressed the reflexes in a time-dependent manner abolishing them by 35 min. Pretreatment with pindolol (1 μM), ketanserin (10 μM) or ondansetron (0.1 μM); 5-HT1, 5-HT2, or 5-HT3 receptor antagonist, respectively, did not block the 3-NPA-induced depression of reflexes whereas, ischemia-induced depression was blocked by ondansetron. 5-HT content of the spinal cords incubated with 3-NPA (3.4 mM) for 30 min was decreased significantly (33 ng/g tissue) while increased (286 ng/g) in cords exposed to ischemic solution as compared to saline-treated cords (161 ng/g). Thus, 3-NPA-induced depression of spinal reflexes does not involve 5-HTergic pathway unlike ischemia-induced depression.
Journal: Neuroscience Letters - Volume 446, Issues 2–3, 3 December 2008, Pages 93–96