[Pharmacological study on metabotropic glutamate receptors on trigeminal neurons].
نویسنده
چکیده
Glutamic acid is known to be a major excitatory transmitter in the central nervous system. The nature of its receptors on the spinal motoneuron have been well investigated and elucidated to consist of ionotropic (iGluR) as well as metabotropic glutamate receptors (mGluR). However, the role of mGluR on trigeminal motoneurons (TMN) and trigeminal sensory neurons (TSN), which play important roles in mastication, has not been well investigated. In this study, the nature of mGluR on TMN and TSN was investigated using isolated brainstem preparations from neonatal rats. The activities of TMN and TSN were recorded from the trigeminal motor and sensory roots respectively, using a suction electrode. All iGluR agonists depolarized TMN and TSN. The mGluR agonists used were RS-3,5dihydroxyphenylglycine (RS-DHPG) for group I, (2S, 1'R, 2'R, 3'R)-2-(2, 3-Dicarboxycyclopropyl) glycine (DCG-IV) for group II, and L(+)-2-amino-4-phosphono-propinate (L-AP4) for group III. Whereas group I agonist increased spontaneous firing, groups II and III agonists decreased it. Group I agonist depolarized TMN and TSN directly. In contrast, group II and III agonists hyperpolarized TSN but induced no potencial changes in TMN. These results suggested that mGluR exist on TMN and TSN.
منابع مشابه
(S)- 3,5-Dihydroxyphenylglycine )an agonist for group I metabotropic glutamate receptors( induced synaptic potentiation at excitatory synapses on fast spiking GABAergic cells in visual cortex
Introduction: (S)- 3,5-Dihydroxyphenylglycine (DHPG) is an agonist for group I metabotropic glutamate receptors. DHPG-induced synaptic depression of excitatory synapses on hippocampal pyramidal neurons is well known model for synaptic plasticity studies. The aim of the present study was to examine the effects of DHPG superfusion on excitatory synapses on pyramidal and fast-spiking GABAergic cel...
متن کاملMetabotropic glutamate receptors and their ligands applications in neurological and psychiatric disorders
Metabotropic glutamate receptors (mGluRs) consist of a large family of G-protein coupled receptors that are critical for regulating normal neuronal function in the central nervous system. The wide distribution and diverse physiological roles of various mGluR subtypes make them highly attractive targets for the treatment of a number of neurological and psychiatric disorders. The discovery of ...
متن کاملInvestigating the expression of metabotropic glutamate receptors in trigeminal ganglion neurons and satellite glial cells: implications for craniofacial pain
CONTEXT/OBJECTIVE Previous studies have demonstrated that various subtypes of the metabotropic glutamate receptors (mGluRs) are expressed in the dorsal root ganglion (DRG) of the peripheral nervous system (PNS), implicating that glutamate potentially contributes to sensory transmission through these receptors. While mGluR expression has been investigated largely in the DRG, the present study fo...
متن کاملRegulation of intrinsic and synaptic properties of neonatal rat trigeminal motoneurons by metabotropic glutamate receptors.
We studied how metabotropic glutamate receptor (mGluR) activation modifies the synaptic and intrinsic membrane properties of neonatal rat trigeminal motoneurons using the broad-spectrum mGluR agonist (1S,3R)-1-amino-1,3-cyclopentane-dicarboxylic acid [(1S,3R)-ACPD], group I/II antagonist (+/-)-alpha-methyl-4-carboxy-phenylglycine (MCPG), and group III agonist L-2-amino-4-phosphonobutanoate (L-A...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Kokubyo Gakkai zasshi. The Journal of the Stomatological Society, Japan
دوره 65 2 شماره
صفحات -
تاریخ انتشار 1998