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Physiological functions of GABA-induced depolarizations in the developing rat spinal cord.

Gamma-aminobutyric acid (GABA) is one of the principle inhibitory neurotransmitters in the mature spinal cord. It effectively suppresses synaptic transmission by mechanisms of postsynaptic and presynaptic inhibition. The function of GABA is less well understood early in spinal cord development, when the amino acid is transiently expressed in most neurons, and it depolarizes instead of hyperpolarizes neurons. This article reviews the possible physiological roles of GABA in modulating synaptic transmission, promoting neuronal development, and regulating neuronal pH during early stages of spinal cord differentiation. It is proposed that despite its depolarizing action, GABA acts as an inhibitory neurotransmitter that may also function as a neurotrophic agent.