The effects of L-glutamate on cultured insect neurones.
The effects of L-glutamate on insect cultured neurones were studied under current and voltage-clamp conditions using conventional and whole-cell patch-clamp techniques. Brief pressure or iontophoretic application of L-glutamate produced either a depolarisation or hyperpolarisation. The current underlying the depolarisation was inwardly directed and reversed at around 0 mV while the hyperpolarisation was caused by an outward current that reversed between -60 and -80 mV. Single channel currents underlying the depolarisation were readily recorded from cell attached patches and showed multiple conductance states. Channel activity corresponding to the hyperpolarising response has not yet been observed.
D000818:Animals; D002478:Cells, Cultured; D003058:Cockroaches / Q000502:physiology*; D004330:Drosophila / Q000502:physiology*; D005971:Glutamates / Q000494:pharmacology*; D018698:Glutamic Acid; D007473:Ion Channels / Q000187:drug effects / Q000502:physiology; D008564:Membrane Potentials; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D017470:Receptors, Glutamate; D017981:Receptors, Neurotransmitter / Q000187:drug effects / Q000502:physiology
D005971:Glutamates; D007473:Ion Channels; D017470:Receptors, Glutamate; D017981:Receptors, Neurotransmitter; D018698:Glutamic Acid