Abstract: The present invention relates to novel anthranilic acid derivatives represented by Chemical Formula I, and a chloride channel blocking agent containing the anthranilic acid derivative or its pharmacologically acceptable salts as an active ingredient. In another aspect, the present invention relates to a method of accurately and efficiently detecting the intracellular chloride channel inhibition and method of screening a chloride channel blocking agent.

Abstract: The present invention relates to a novel use of a transfected cell as a biosensor, wherein the transfected cell expresses a receptor specific to a bio-signal transmitter, and a highly sensitive detector and a highly sensitive detecting method of a bio-signal transmitter using the biosensor. The bio-signal transmitter detecting technique according to the present invention has an advantage of being applied to a sniffer-patch method, and is capable of providing millisecond time resolution for detecting nanomolar levels of the bio-signal transmitter to be detected.

Abstract: The present invention relates to a novel communication mechanism between astrocytes and neurons at a synapse. More specifically, the present invention relates to a signaling mechanism between astrocytes and neurons, by activating astrocytic G-protein coupled receptors, thereby activating glutamate receptors on a membrane of neighboring postsynaptic neurons, resulting in increasing the level of intracellular Ca2+ and inducing a depolarization inward current to control neurotransmission in neurons.