Original Article

Activity- and Ca²⁺-dependent Modulation of Surface Expression of Brain-derived Neurotrophic Factor Receptors in Hippocampal Neurons

Correspondence to: Bai Lu, Unit on Synapse Development and Plasticity, NICHD, NIH, Bldg. 49, Rm. 5A38, 49 Convent Dr., Bethesda, MD 20892-4480. Tel:(301) 435-2970 Fax:(301) 496-9939

Brain-derived neurotrophic factor (BDNF) has been shown to regulate neuronal survival and synaptic plasticity in the central nervous system (CNS) in an activity-dependent manner, but the underlying mechanisms remain unclear. Here we report that the number of BDNF receptor TrkB on the surface of hippocampal neurons can be enhanced by high frequency neuronal activity and synaptic transmission, and this effect is mediated by Ca²⁺ influx. Using membrane protein biotinylation as well as receptor binding assays, we show that field electric stimulation increased the number of TrkB on the surface of cultured hippocampal neurons. Immunofluorescence staining suggests that the electric stimulation facilitated the movement of TrkB from intracellular pool to the cell surface, particularly on neuronal processes. The number of surface TrkB was regulated only by high frequency tetanic stimulation, but not by low frequency stimulation. The activity dependent modulation appears to require Ca²⁺ influx, since treatment of the neurons with blockers of voltage-gated Ca²⁺ channels or NMDA receptors, or removal of extracellular Ca²⁺, severely attenuated the effect of electric stimulation. Moreover, inhibition of Ca²⁺/calmodulin-dependent kinase II (CaMKII) significantly reduced the effectiveness of the tetanic stimulation. These findings may help us to understand the role of neuronal activity in neurotrophin function and the mechanism for receptor tyrosine kinase signaling.

Key Words: TrkB receptors, tetanic stimulation, calcium influx, Ca²⁺/calmodulin-dependent kinase II, synaptic transmission

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