Biomaterial Database

Impariment by 6-hydroxydopamine of locus coeruleus-induced monosynaptic potential in the spinal trigeminal nucleus. 1974

M Sasa, and K Munekiyo, and S Takaori

All experiments were performed on cats immobilized with gallamine. In the rostral part of spinal trigeminal nucleus (STN), single fiber action potential with a consistent and short latency was elicited by electrical stimulation of the locus coeruleus (LC). When 2 mg of 6-hydroxydopamine (6-OHDA) dissolved in 5% ascorbic acid solution was applied into the lateral ventricle, the STN field potential produced by LC stimulation was reduced in amplitude within 20 hr. The STN potential elicited by trigeminal nerve stimulation, however, was unaffected until 24 hr after 6-OHDA. The drug also blocked the inhibitory effect of LC conditioning stimulation on the STN potential elicited by trigeminal nerve stimulation, whereas it did not modify the inhibitory effect of conditioning stimulation of the sensory cortex on the STN potential. Ascorbic acid solution, a solvent, affected neither the STN potential by LC stimulation, nor the inhibitory effect of LC neurons on the STN potential elicited by trigeminal nerve stimulation. These results strongly suggest the existence of noradrenergic fiber from the LC to STN, through which inhibition of the STN neurons is produced.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009433	Neural Inhibition	The function of opposing or restraining the excitation of neurons or their target excitable cells.	Inhibition, Neural
D009434	Neural Pathways	Neural tracts connecting one part of the nervous system with another.	Neural Interconnections,Interconnection, Neural,Interconnections, Neural,Neural Interconnection,Neural Pathway,Pathway, Neural,Pathways, Neural
D002415	Cats	The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801)	Felis catus,Felis domesticus,Domestic Cats,Felis domestica,Felis sylvestris catus,Cat,Cat, Domestic,Cats, Domestic,Domestic Cat
D002552	Cerebral Ventricles	Four CSF-filled (see CEREBROSPINAL FLUID) cavities within the cerebral hemispheres (LATERAL VENTRICLES), in the midline (THIRD VENTRICLE) and within the PONS and MEDULLA OBLONGATA (FOURTH VENTRICLE).	Foramen of Monro,Cerebral Ventricular System,Cerebral Ventricle,Cerebral Ventricular Systems,Monro Foramen,System, Cerebral Ventricular,Systems, Cerebral Ventricular,Ventricle, Cerebral,Ventricles, Cerebral,Ventricular System, Cerebral,Ventricular Systems, Cerebral
D004558	Electric Stimulation	Use of electric potential or currents to elicit biological responses.	Stimulation, Electric,Electrical Stimulation,Electric Stimulations,Electrical Stimulations,Stimulation, Electrical,Stimulations, Electric,Stimulations, Electrical
D005260	Female		Females
D006892	Hydroxydopamines	Dopamines with a hydroxy group substituted in one or more positions.	Hydroxydopamine
D000200	Action Potentials	Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.	Spike Potentials,Nerve Impulses,Action Potential,Impulse, Nerve,Impulses, Nerve,Nerve Impulse,Potential, Action,Potential, Spike,Potentials, Action,Potentials, Spike,Spike Potential
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia