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A magnetic device to stimulate selected whiskers of freely moving or restrained small rodents: its application in a
Abstract:
After receiving an intraperitoneal injection of [14C]2-deoxy-D-glucose (2-DG), a total of 28 mice which had pieces of metal wire glued to certain whiskers (all others were clipped) were exposed to magnetic field bursts. The stimulated whiskers were B1 (freely moving mice, set I) or whiskers C1-3 and E1 (restrained mice, set II) on the left side. In set I, stimulated mice were compared with animals of various control groups. Autoradiography demonstrated an activation of columnar shape overlying the presumed corresponding barrel contralateral to stimulation; in a part of the ipsilateral barrelfield, 2-DG uptake was depressed significantly. In the subnuclei caudalis and interpolaris of the trigeminal brainstem complex a spot of activation was observed ipsilaterally but there was no depression contralaterally. Whereas several animals of the control groups showed some aspects of these responses, they were consistent only in stimulated mice. In set II, animals received stimulation with different intensities. 2-DG uptake was higher in barrels C1-3 than in E1. It increased with increasing intensity. The same observations were made in two nuclei of termination. The device we describe here can be used to study stimulus-specific responses at various levels of the somatosensory pathway.
Insights
Magnetic field bursts activate specific whisker pathways in mice, altering glucose metabolism in the brain. This study reveals stimulus-specific responses in the somatosensory system using 2-deoxy-D-glucose (2-DG) imaging.
Area of Science:
- Neuroscience
- Sensory Systems Biology
- Animal Models
Background:
- The somatosensory system processes sensory information, with the trigeminal system crucial for facial sensation.
- Understanding how specific stimuli activate neural pathways is key to deciphering sensory processing.
Purpose of the Study:
- To investigate the neural responses to magnetic field bursts in the somatosensory pathway.
- To characterize stimulus-specific activation patterns using 2-deoxy-D-glucose (2-DG) uptake.
Main Methods:
- 28 mice received intraperitoneal injections of [14C]2-deoxy-D-glucose (2-DG).
- Whiskers were stimulated with magnetic field bursts, with different whisker sets and restraint conditions used.
- Autoradiography was employed to visualize 2-DG uptake in brain regions.
Main Results:
- Magnetic field stimulation induced columnar activation in the contralateral barrel cortex and depression in the ipsilateral barrelfield.
- Activation was observed in the ipsilateral trigeminal brainstem complex (subnuclei caudalis and interpolaris).
- 2-DG uptake intensity correlated with magnetic field stimulation intensity.
Conclusions:
- Magnetic field bursts elicit consistent, stimulus-specific neural responses in the somatosensory pathway.
- The described method allows for the study of stimulus-specific responses across different levels of the somatosensory system.
- Findings contribute to understanding sensory pathway activation and developing new research tools.