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Dampened neural activity and abolition of epileptic-like activity in cortical slices by active ingredients of spices.

ABSTRACT: Active ingredients of spices (AIS) modulate neural response in the peripheral nervous system, mainly through interaction with TRP channel/receptors. The present study explores how different AIS modulate neural response in layer 5 pyramidal neurons of S1 neocortex. The AIS tested are agonists of TRPV1/3, TRPM8 or TRPA1. Our results demonstrate that capsaicin, eugenol, menthol, icilin and cinnamaldehyde, but not AITC dampen the generation of APs in a voltage- and time-dependent manner. This effect was further tested for the TRPM8 ligands in the presence of a TRPM8 blocker (BCTC) and on TRPM8 KO mice. The observable effect was still present. Finally, the influence of the selected AIS was tested on in vitro gabazine-induced seizures. Results coincide with the above observations: except for cinnamaldehyde, the same AIS were able to reduce the number, duration of the AP bursts and increase the concentration of gabazine needed to elicit them. In conclusion, our data suggests that some of these AIS can modulate glutamatergic neurons in the brain through a TRP-independent pathway, regardless of whether the neurons are stimulated intracellularly or by hyperactive microcircuitry.

SUBMITTER: Pezzoli M

PROVIDER: S-EPMC4215320 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Dampened neural activity and abolition of epileptic-like activity in cortical slices by active ingredients of spices.

Pezzoli Maurizio M Elhamdani Abdeladim A Camacho Susana S Meystre Julie J González Stephanie Michlig SM le Coutre Johannes J Markram Henry H

Scientific reports 20141031

Active ingredients of spices (AIS) modulate neural response in the peripheral nervous system, mainly through interaction with TRP channel/receptors. The present study explores how different AIS modulate neural response in layer 5 pyramidal neurons of S1 neocortex. The AIS tested are agonists of TRPV1/3, TRPM8 or TRPA1. Our results demonstrate that capsaicin, eugenol, menthol, icilin and cinnamaldehyde, but not AITC dampen the generation of APs in a voltage- and time-dependent manner. This effect ...[more]

PMID: 25359561

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Project description:Myelination of axons by oligodendrocytes in the central nervous system is crucial for fast, saltatory conduction of action potentials. As myelination is central for brain development and plasticity, and deficits are implicated in several neural disorders such as multiple sclerosis, major depressive disorder, bipolar disorder and schizophrenia, it is important to elucidate the underlying mechanisms regulating myelination. Numerous mechanisms have been proposed by which the communication between oligodendrocytes and active axons may regulate the onset and maintenance of activity-dependent myelination. We compared two models of 'silencing' layer V and/or VI cortical projection neurons from early stages by either decreasing their excitability through Kir2.1 expression, an inward rectifying potassium channel, introduced through in utero electroporation at embryonic day (E)13.5, or inhibiting regulated vesicular release through Cre-dependent knock-out of synaptosomal associated protein 25 kDA (SNAP25). SNAP25 is a component of the soluble N-ethylmaleimide fusion protein attachment protein receptor (SNARE) complex, which, among others, is needed for calcium-dependent regulated vesicle release from synapses. In layer VI cortical projection neurons in the Ntsr1-Cre;Ai14;Snap25 fl/fl mouse, we found that inhibiting regulated vesicular release significantly decreased the amount of myelin basic protein (MBP, used as marker for myelination) and the amount of myelinated projections at postnatal day (P)14 without affecting the initial timing of onset of myelination in the brain (at P7/P8). Additionally, overall oligodendrocyte maturation appears to be affected. A strong trend towards reduced node of Ranvier (NoR) length was also observed in Ntsr1-Cre;Ai14;Snap25 fl/fl corpus callosum. An equally strong trend towards reduced NoR length was observed in Rbp4-Cre;Ai14;Snap25 fl/fl corpus callosum at P14, and the g-ratio in the spinal cord dorsal column was reduced at P18. However, no measurable differences in levels of MBP were detected in the striatum when comparing Rbp4-Cre;Ai14;Snap25 fl/fl and control brains. Conversely, Kir2.1 in utero electroporation at E13.5 did not significantly affect the amount of MBP or number of myelinated callosal axons at P14 but did significantly decrease the NoR length measured in the corpus callosum. It therefore seems likely that the excitability of the neuron can potentially perform a modulating function of myelin characteristics, whereas regulated vesicular release has the potential to have a more pronounced effect on overall myelination, but in a cell-type specific manner.

Dataset Information

Dampened neural activity and abolition of epileptic-like activity in cortical slices by active ingredients of spices.

Publications

Dampened neural activity and abolition of epileptic-like activity in cortical slices by active ingredients of spices.

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