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Dysfunction within the striatal direct and indirect projecting systems arises after 6-hydroxydopamine (6-OHDA)-induced dopamine depletion, highlighting the central regulatory function of dopamine in motor systems. However, the striatal 5-hydroxytryptamine (5-HT) innervation remains intact after 6-OHDA lesions, suggesting that the 5-HT system may contribute to the lesion-induced dysfunction, or alternatively, it may adapt and compensate for the dopamine deficit. Neonatal 6-OHDA lesions actually give rise to a 5-HT axonal hyperinnervation within the dorsal striatum, further reinforcing the idea that the 5-HT system plays a central role in striatal function after dopamine depletion. Here we show that neonatal but not adult 6-OHDA lesions result in a novel coupling of 5-HT2 receptors to the ERK1/2/MAP Kinase pathway, a signaling cascade known to regulate neuronal plasticity. Chloroamphetamine-induced 5-HT release or direct stimulation of striatal 5-HT2 receptors via the 5-HT2 agonist DOI, produced robust ERK1/2 phosphorylation throughout the dorsal striatum of neonatal lesioned animals, a response not observed within the intact striatum. Pretreatment with the select 5-HT2 receptor antagonist Ketanserin blocked DOI-induced ERK1/2 phosphorylation. This drug-induced ERK1/2 phosphorylation was subsequently shown to be restricted to direct pathway striatal neurons. Our data show that adaptation of direct pathway neurons after neonatal 6-OHDA lesions involves coupling of 5-HT2 receptors to the ERK1/2/MAP Kinase cascade, a pathway not typically active in these neurons. Because dopamine-mediated signaling is redundant after 6-OHDA lesions, 5-HT-mediated stimulation of the ERK1/2/MAP Kinase pathway may provide an alternative signaling route allowing the regulation of neuronal gene expression and neuronal plasticity in the absence of dopamine.
Agreement between spot and 24-hour urine protein measurements is poor in kidney transplant recipients. We investigated whether using formulae to estimate creatinine excretion rate (eCER), rather than assuming a standard creatinine excretion rate, would improve the estimation of proteinuria from spot urine samples in kidney transplant recipients.
The characterization and cellular localization of transcription factors like NF-κB requires the use of antibodies for western blots and immunohistochemistry. However, if target protein levels are low and the antibodies not well characterized, false positive data can result. In studies of NF-κB activity in the CNS, antibodies detecting NF-κB proteins have been used to support the finding that NF-κB is constitutively active in neurons, and activity levels are further increased by neurotoxic treatments, glutamate stimulation, or elevated synaptic activity. The specificity of the antibodies used was analyzed in this study.
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