Publication Date:
2010-06-19
Description:
Functional receptive fields of neurons in sensory cortices undergo progressive refinement during development. Such refinement may be attributed to the pruning of non-optimal excitatory inputs, reshaping of the excitatory tuning profile through modifying the strengths of individual inputs, or strengthening of cortical inhibition. These models have not been directly tested because of the technical difficulties in assaying the spatiotemporal patterns of functional synaptic inputs during development. Here we apply in vivo whole-cell voltage-clamp recordings to the recipient layer 4 neurons in the rat primary auditory cortex (A1) to determine the developmental changes in the frequency-intensity tonal receptive fields (TRFs) of their excitatory and inhibitory inputs. Surprisingly, we observe co-tuned excitation and inhibition immediately after the onset of hearing, suggesting that a tripartite thalamocortical circuit with relatively strong feedforward inhibition is formed independently of auditory experience. The frequency ranges of tone-driven excitatory and inhibitory inputs first expand within a few days of the onset of hearing and then persist into adulthood. The latter phase is accompanied by a sharpening of the excitatory but not inhibitory frequency tuning profile, which results in relatively broader inhibitory tuning in adult A1 neurons. Thus the development of cortical synaptic TRFs after the onset of hearing is marked by a slight breakdown of previously formed excitation-inhibition balance. Our results suggest that functional refinement of cortical TRFs does not require a selective pruning of inputs, but may depend more on a fine adjustment of excitatory input strengths.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2909826/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2909826/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, Yujiao J -- Wu, Guangying K -- Liu, Bao-Hua -- Li, Pingyang -- Zhou, Mu -- Xiao, Zhongju -- Tao, Huizhong W -- Zhang, Li I -- EY018718/EY/NEI NIH HHS/ -- EY019049/EY/NEI NIH HHS/ -- R01 DC008983/DC/NIDCD NIH HHS/ -- R01 DC008983-01/DC/NIDCD NIH HHS/ -- R01 DC008983-02/DC/NIDCD NIH HHS/ -- R01 DC008983-03/DC/NIDCD NIH HHS/ -- R01 DC008983-04/DC/NIDCD NIH HHS/ -- R01 EY019049/EY/NEI NIH HHS/ -- R01 EY019049-02/EY/NEI NIH HHS/ -- R01DC008983/DC/NIDCD NIH HHS/ -- R03 DC006814/DC/NIDCD NIH HHS/ -- R03 DC006814-01A1/DC/NIDCD NIH HHS/ -- R03 DC006814-02/DC/NIDCD NIH HHS/ -- R03 DC006814-03/DC/NIDCD NIH HHS/ -- R21 DC008588/DC/NIDCD NIH HHS/ -- R21 DC008588-01/DC/NIDCD NIH HHS/ -- R21 DC008588-02/DC/NIDCD NIH HHS/ -- R21DC008588/DC/NIDCD NIH HHS/ -- UL1 RR025755/RR/NCRR NIH HHS/ -- England -- Nature. 2010 Jun 17;465(7300):927-31. doi: 10.1038/nature09079.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California 90089, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20559386" target="_blank"〉PubMed〈/a〉
Keywords:
Acoustic Stimulation
;
Animals
;
Auditory Cortex/growth & development/*physiology
;
Auditory Pathways/physiology
;
Electrical Synapses/physiology
;
Excitatory Postsynaptic Potentials/*physiology
;
Hearing/physiology
;
Neural Inhibition/*physiology
;
Patch-Clamp Techniques
;
Rats
;
Rats, Sprague-Dawley
;
Sensory Receptor Cells/*physiology
;
Time Factors
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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