Input-specific maturation of synaptic dynamics of parvalbumin interneurons in primary visual cortex.
Cortical networks consist of local recurrent circuits and long-range pathways from other brain areas. Parvalbumin-positive interneurons (PVNs) regulate the dynamic operation of local ensembles as well as the temporal precision of afferent signals. The synaptic recruitment of PVNs that support these circuit operations is not well-understood. Here we demonstrate that the synaptic dynamics of PVN recruitment in mouse visual cortex are customized according to input source with distinct maturation profiles. Whereas the long-range inputs to PVNs show strong short-term depression throughout postnatal maturation, local inputs from nearby pyramidal neurons progressively lose such depression. This enhanced local recruitment depends on PVN-mediated reciprocal inhibition and results from both pre- and postsynaptic mechanisms, including calcium-permeable AMPA receptors at PVN postsynaptic sites. Although short-term depression of long-range inputs is well-suited for afferent signal detection, the robust dynamics of local inputs may facilitate rapid and proportional PVN recruitment in regulating local circuit operations.
Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724; and.
Jiangteng
J
Lu
Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724; and Medical Scientist Training Program and Program in Neuroscience, Stony Brook University, Stony Brook, NY 11790.
Jason
J
Tucciarone
Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724; and.
Ying
Y
Lin
Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724; and huangj@cshl.edu.
Z Josh
ZJ
Huang
D000818:Animals; D007395:Interneurons / Q000378:metabolism*; D051379:Mice; D010320:Parvalbumins / Q000378:metabolism*; D013569:Synapses / Q000502:physiology*; D014793:Visual Cortex / Q000378:metabolism* / Q000502:physiology
D010320:Parvalbumins
input-specific; maturation; parvalbumin interneuron; short-term plasticity; synapse