Korean J Physiol Pharmacol.  2019 Sep;23(5):317-328. 10.4196/kjpp.2019.23.5.317.

Layer-specific cholinergic modulation of synaptic transmission in layer 2/3 pyramidal neurons of rat visual cortex

Affiliations
  • 1Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea. djrhie@catholic.ac.kr
  • 2Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.

Abstract

It is known that top-down associative inputs terminate on distal apical dendrites in layer 1 while bottom-up sensory inputs terminate on perisomatic dendrites of layer 2/3 pyramidal neurons (L2/3 PyNs) in primary sensory cortex. Since studies on synaptic transmission in layer 1 are sparse, we investigated the basic properties and cholinergic modulation of synaptic transmission in layer 1 and compared them to those in perisomatic dendrites of L2/3 PyNs of rat primary visual cortex. Using extracellular stimulations of layer 1 and layer 4, we evoked excitatory postsynaptic current/potential in synapses in distal apical dendrites (L1-EPSC/L1-EPSP) and those in perisomatic dendrites (L4-EPSC/L4-EPSP), respectively. Kinetics of L1-EPSC was slower than that of L4-EPSC. L1-EPSC showed presynaptic depression while L4-EPSC was facilitating. In contrast, inhibitory postsynaptic currents showed similar paired-pulse ratio between layer 1 and layer 4 stimulations with depression only at 100 Hz. Cholinergic stimulation induced presynaptic depression by activating muscarinic receptors in excitatory and inhibitory synapses to similar extents in both inputs. However, nicotinic stimulation enhanced excitatory synaptic transmission by ~20% in L4-EPSC. Rectification index of AMPA receptors and AMPA/NMDA ratio were similar between synapses in distal apical and perisomatic dendrites. These results provide basic properties and cholinergic modulation of synaptic transmission between distal apical and perisomatic dendrites in L2/3 PyNs of the visual cortex, which might be important for controlling information processing balance depending on attentional state.

Keyword

Cholinergic modulation; Layer 2/3; Layer-specific; Synaptic transmission; Visual cortex

MeSH Terms

Animals
Automatic Data Processing
Dendrites
Depression
Inhibitory Postsynaptic Potentials
Kinetics
Pyramidal Cells*
Rats*
Receptors, AMPA
Receptors, Muscarinic
Synapses
Synaptic Transmission*
Visual Cortex*
Receptors, AMPA
Receptors, Muscarinic

Figure

  • Fig. 1 Independency of layer 1 (L1) and L4 stimulations. (A) Experimental configuration (5x objective image) showing positions of glass and tungsten electrodes at L1 and L4, respectively. A patch pipet recording a layer 2/3 pyramidal neuron was indicated as P. Image of biocytin-filled cell is overlaid. Scale = 200 µm. (B) Excitatory postsynaptic currents (EPSCs) evoked by combined stimulation of L1 and L4 (L1 + L4) were compared with the arithmetic sum of each EPSC (right panel, n = 5). (C) Cross paired-pulse stimulation of L1 and L4 stimulations indicated the independency of these two inputs. Relative EPSC amplitude was obtained from peak amplitude of the second EPSC of cross paired-pulse stimulation (L1–L4, L4–L1) versus peak amplitude of the first EPSC of paired-pulse stimulation (L1–L1, L4–L4) (n = 6).

  • Fig. 2 Kinetics of excitatory postsynaptic current (EPSC) and excitatory postsynaptic potential (EPSP) evoked by layer 1 (L1) and L4 stimulations. (A) EPSCs (upper traces) and EPSPs (lower traces) were recorded with stimulations of L1 (thin trace) and L4 (thick trace). EPSC(P) traces were normalized to the peak. (B) Summary plots of peak time and decay time constant (tau) of EPSC (n = 11) and EPSP (n = 9) evoked by stimulations of L1 (open bar) and L4 (closed bar). *p < 0.05, **p < 0.01, ***p < 0.001 compared to L1.

  • Fig. 3 Short-term kinetics of excitatory postsynaptic current (EPSC) evoked by layer 1 (L1) and L4 stimulations. (A) Left panel shows representative currents evoked by stimulations of L1 (dotted line) and L4 (solid line) recorded at holding potential of −80 mV. Middle and right panels show representative currents measured at holding potential of −80 mV and 0 mV, respectively, in the presence of 6,7-dinitroquinoxaline-2,3-dione disodium salt (DNQX) (20 µM) and D-(−)-2-Amino-5-phosphonopentanoic acid (D-AP5) (50 µM) in bath solution (n = 3). (B) Representative traces from paired-pulse stimulations with interstimulus interval (ISI) of 10 to 200 ms, evoked by L1 stimulation (upper traces) and L4 stimulation (lower traces). EPSC traces were normalized to the first peak. (C) Summary of paired-pulse ratio (PPR) with stimulations of L1 and L4 (n = 13). *p < 0.05, **p < 0.01, ***p < 0.001 compared to L4.

  • Fig. 4 Cholinergic modulation of excitatory postsynaptic current (EPSC) evoked by layer 1 (L1) and L4 stimulations. EPSCs were evoked by stimulations of L1 (A) and L4 (B) with bath application of cholinergic agonists at various concentrations. Representative traces of EPSC at various concentrations (µM) of muscarine and nicotine are shown in the right panel. All drugs were applied into bath solution and effects were analyzed at 5 min after application of the drugs (n = 8–14). EPSCs were decreased by non-specific cholinergic agonist carbachol and muscarinic receptor agonist muscarine in a concentration-dependent manner. However, nicotinic receptor agonist nicotine increased L4-EPSC at concentrations lower than 1 µM. *p < 0.05, **p < 0.01, ***p < 0.001 compared with normal bath solution.

  • Fig. 5 Presynaptic effect of cholinergic modulation on excitatory postsynaptic current (EPSC). (A) Experimental configuration showing positions of glass puff-pipettes (layer 1 [L1] and L2/3) and a recording patch pipet with an L2/3 pyramidal neuron. (B) Inward currents were evoked by puff application of glutamate (0.3–3 mM) in L1 and L2/3 (perisomatic area). Puffs were applied every 20 sec at 5 psi for 5–30 ms using a glass pipet (bars on traces). Muscarine (10 µM, 5 min) was applied into the bath solution. Upper traces show representative average EPSCs taken at indicated time period (2 min). (C) Summary plot for effects of various cholinergic agonists (10 µM) on amplitude of EPSCs evoked by puff application of glutamate (n = 5) recorded at the end of application (CCh, carbachol; Mus, muscarine; Nic, nicotine). (D) Representative traces of muscarine (10 µM) application on miniature EPSCs (mEPSCs) recorded in the presence of tetrodotoxin (1 µM). (E) Summary plots of muscarine effects on mEPSCs amplitude and frequency (n = 11). ***p < 0.001 tested with ANOVA.

  • Fig. 6 Short-term kinetics of inhibitory postsynaptic current (IPSC) evoked by layer 1 (L1) and L4 stimulations. IPSCs were evoked by paired-pulse stimulation with various interstimulus interval (ISI) with L1 and L4 stimulations in the presence of 6,7-dinitroquinoxaline-2,3-dione disodium salt (DNQX) (20 µM) and D-(−)-2-Amino-5-phosphonopentanoic acid (D-AP5) (50 µM). (A) Representative IPSCs evoked by paired-pulse stimulations with ISI of 10 to 200 ms, evoked by L1 stimulation (upper traces) and L4 stimulation (lower traces). IPSC traces were normalized to the first peak. (B) Summary plot shows paired-pulse ratio (PPR) with L1 stimulation (n = 14) and L4 stimulation (n = 16). *p < 0.05, **p < 0.01 tested with ANOVA.

  • Fig. 7 Cholinergic modulation of inhibitory postsynaptic currents (IPSCs) evoked by layer 1 (L1) and L4 stimulations. IPSCs were evoked by stimulating L1 (A) and L4 (B) in the presence of various cholinergic agonists. Representative traces of inhibitory postsynaptic current (IPSC) at various concentrations (µM) of muscarine and nicotine were shown in the right panel. All drugs were applied in the bath solution and their effects were analyzed at 5 min after application. IPSCs were declined by carbachol (n = 10) and muscarine (n = 7) in a concentration-dependent manner. Nicotine had no effects on L1 or L4 stimulation (n = 8). *p < 0.05, **p < 0.01, ***p < 0.001 compared with normal bath solution.

  • Fig. 8 Properties of glutamatergic synapses activated by layer 1 (L1) and L4 stimulations. (A) Excitatory postsynaptic currents (EPSCs) were evoked by L1 stimulation (left panel) or L4 stimulation (middle panel) at holding potential of either −80 or +40 mV. Amplitude of AMPA receptor-mediated EPSC was analyzed at peak of synaptic response recorded at −80 mV (dotted line). Amplitude of NMDA receptor-mediated EPSC was analyzed 50 ms after stimulus onset at +40 mV (solid line). Ratio of AMPA/NMDA receptor-mediated EPSCs was obtained from these values (right panel, n = 5–7). (B) AMPA receptor-mediated EPSCs were measured at various membrane potentials. Current-voltage (I–V) curve of L1 (left panels) and L4 stimulation (right panels) are plotted. Rectification index of AMPA receptor-mediated EPSCs was calculated using the following equation: I+40 / (40 − Erev) / I−40 (Erev + 40). Reversal potential for AMPA receptor mediated-EPSC (Erev) was obtained from its I–V relationship.


Reference

1. Somogyi P, Tamás G, Lujan R, Buhl EH. Salient features of synaptic organisation in the cerebral cortex. Brain Res Brain Res Rev. 1998; 26:113–135.
2. Williams SR, Stuart GJ. Role of dendritic synapse location in the control of action potential output. Trends Neurosci. 2003; 26:147–154.
Article
3. Sjöström PJ, Rancz EA, Roth A, Häusser M. Dendritic excitability and synaptic plasticity. Physiol Rev. 2008; 88:769–840.
Article
4. Spruston N. Pyramidal neurons: dendritic structure and synaptic integration. Nat Rev Neurosci. 2008; 9:206–221.
Article
5. Larkum M. A cellular mechanism for cortical associations: an organizing principle for the cerebral cortex. Trends Neurosci. 2013; 36:141–151.
Article
6. Shipp S. Structure and function of the cerebral cortex. Curr Biol. 2007; 17:R443–R449.
Article
7. Petreanu L, Mao T, Sternson SM, Svoboda K. The subcellular organization of neocortical excitatory connections. Nature. 2009; 457:1142–1145.
Article
8. Larkman AU. Dendritic morphology of pyramidal neurones of the visual cortex of the rat: III. Spine distributions. J Comp Neurol. 1991; 306:332–343.
Article
9. Larkum ME, Senn W, Lüscher HR. Top-down dendritic input increases the gain of layer 5 pyramidal neurons. Cereb Cortex. 2004; 14:1059–1070.
Article
10. Katz LC, Shatz CJ. Synaptic activity and the construction of cortical circuits. Science. 1996; 274:1133–1138.
Article
11. Bear MF, Rittenhouse CD. Molecular basis for induction of ocular dominance plasticity. J Neurobiol. 1999; 41:83–91.
Article
12. Cho KH, Jang HJ, Jo YH, Singer W, Rhie DJ. Cholinergic induction of input-specific late-phase LTP via localized Ca2+ release in the visual cortex. J Neurosci. 2012; 32:4520–4530.
13. Salgado H, Garcia-Oscos F, Patel A, Martinolich L, Nichols JA, Dinh L, Roychowdhury S, Tseng KY, Atzori M. Layer-specific noradrenergic modulation of inhibition in cortical layer II/III. Cereb Cortex. 2011; 21:212–221.
Article
14. Joo K, Cho KH, Youn SH, Jang HJ, Rhie DJ. Layer-specific involvement of endocannabinoid signaling in muscarinic-induced long-term depression in layer 2/3 pyramidal neurons of rat visual cortex. Brain Res. 2019; 1712:124–131.
Article
15. Hasselmo ME. Neuromodulation: acetylcholine and memory consolidation. Trends Cogn Sci. 1999; 3:351–359.
Article
16. Wen JA, Barth AL. Input-specific critical periods for experience-dependent plasticity in layer 2/3 pyramidal neurons. J Neurosci. 2011; 31:4456–4465.
Article
17. Sarter M, Hasselmo ME, Bruno JP, Givens B. Unraveling the attentional functions of cortical cholinergic inputs: interactions between signal-driven and cognitive modulation of signal detection. Brain Res Brain Res Rev. 2005; 48:98–111.
Article
18. Gonchar Y, Burkhalter A. Three distinct families of GABAergic neurons in rat visual cortex. Cereb Cortex. 1997; 7:347–358.
Article
19. Brill J, Huguenard JR. Sequential changes in AMPA receptor targeting in the developing neocortical excitatory circuit. J Neurosci. 2008; 28:13918–13928.
Article
20. Quinlan EM, Olstein DH, Bear MF. Bidirectional, experience-dependent regulation of N-methyl-D-aspartate receptor subunit composition in the rat visual cortex during postnatal development. Proc Natl Acad Sci U S A. 1999; 96:12876–12880.
Article
21. Lee C, Joo K, Kim MJ, Rhie DJ, Jang HJ. GluN2B-containing N-methyl-D-aspartate receptors compensate for the inhibitory control of synaptic plasticity during the early critical period in the rat visual cortex. J Neurosci Res. 2015; 93:1405–1412.
Article
22. Rhie DJ, Kang HY, Ryu GR, Kim MJ, Yoon SH, Hahn SJ, Min DS, Jo YH, Kim MS. Electrophysiological and morphological classification of inhibitory interneurons in layer II/III of the rat visual cortex. Korean J Physiol Pharmacol. 2003; 7:317–323.
23. Dobrunz LE, Stevens CF. Heterogeneity of release probability, facilitation, and depletion at central synapses. Neuron. 1997; 18:995–1008.
Article
24. Gil Z, Connors BW, Amitai Y. Differential regulation of neocortical synapses by neuromodulators and activity. Neuron. 1997; 19:679–686.
Article
25. Cruikshank SJ, Urabe H, Nurmikko AV, Connors BW. Pathway-specific feedforward circuits between thalamus and neocortex revealed by selective optical stimulation of axons. Neuron. 2010; 65:230–245.
Article
26. Rose HJ, Metherate R. Auditory thalamocortical transmission is reliable and temporally precise. J Neurophysiol. 2005; 94:2019–2030.
Article
27. Amitai Y. Thalamocortical synaptic connections: efficacy, modulation, inhibition and plasticity. Rev Neurosci. 2001; 12:159–173.
Article
28. Volpicelli LA, Levey AI. Muscarinic acetylcholine receptor subtypes in cerebral cortex and hippocampus. Prog Brain Res. 2004; 145:59–66.
Article
29. Lee SH, Dan Y. Neuromodulation of brain states. Neuron. 2012; 76:209–222.
Article
30. Hasselmo ME, McGaughy J. High acetylcholine levels set circuit dynamics for attention and encoding and low acetylcholine levels set dynamics for consolidation. Prog Brain Res. 2004; 145:207–231.
Article
31. Mesulam MM, Mufson EJ, Wainer BH, Levey AI. Central cholinergic pathways in the rat: an overview based on an alternative nomenclature (Ch1-Ch6). Neuroscience. 1983; 10:1185–1201.
Article
32. Lysakowski A, Wainer BH, Bruce G, Hersh LB. An atlas of the regional and laminar distribution of choline acetyltransferase immunoreactivity in rat cerebral cortex. Neuroscience. 1989; 28:291–336.
Article
33. van der Zee EA, Luiten PG. Muscarinic acetylcholine receptors in the hippocampus, neocortex and amygdala: a review of immunocytochemical localization in relation to learning and memory. Prog Neurobiol. 1999; 58:409–471.
Article
34. Alkondon M, Albuquerque EX. The nicotinic acetylcholine receptor subtypes and their function in the hippocampus and cerebral cortex. Prog Brain Res. 2004; 145:109–120.
Article
35. Hasselmo ME, Bower JM. Cholinergic suppression specific to intrinsic not afferent fiber synapses in rat piriform (olfactory) cortex. J Neurophysiol. 1992; 67:1222–1229.
Article
36. Hsieh CY, Cruikshank SJ, Metherate R. Differential modulation of auditory thalamocortical and intracortical synaptic transmission by cholinergic agonist. Brain Res. 2000; 880:51–64.
Article
37. Oldford E, Castro-Alamancos MA. Input-specific effects of acetylcholine on sensory and intracortical evoked responses in the “barrel cortex” in vivo. Neuroscience. 2003; 117:769–778.
38. Jang HJ, Cho KH, Kim MJ, Yoon SH, Rhie DJ. Layer- and cell-type-specific tonic GABAergic inhibition of pyramidal neurons in the rat visual cortex. Pflugers Arch. 2013; 465:1797–1810.
Article
39. Liu G. Local structural balance and functional interaction of excitatory and inhibitory synapses in hippocampal dendrites. Nat Neurosci. 2004; 7:373–379.
Article
40. Haider B, Duque A, Hasenstaub AR, McCormick DA. Neocortical network activity in vivo is generated through a dynamic balance of excitation and inhibition. J Neurosci. 2006; 26:4535–4545.
41. Lucas-Meunier E, Monier C, Amar M, Baux G, Frégnac Y, Fossier P. Involvement of nicotinic and muscarinic receptors in the endogenous cholinergic modulation of the balance between excitation and inhibition in the young rat visual cortex. Cereb Cortex. 2009; 19:2411–2427.
Article
42. Laezza F, Doherty JJ, Dingledine R. Long-term depression in hippocampal interneurons: joint requirement for pre- and postsynaptic events. Science. 1999; 285:1411–1414.
Article
43. Kumar SS, Bacci A, Kharazia V, Huguenard JR. A developmental switch of AMPA receptor subunits in neocortical pyramidal neurons. J Neurosci. 2002; 22:3005–3015.
Article
44. Busetto G, Higley MJ, Sabatini BL. Developmental presence and disappearance of postsynaptically silent synapses on dendritic spines of rat layer 2/3 pyramidal neurons. J Physiol. 2008; 586:1519–1527.
Article
45. Daw N, Rao Y, Wang XF, Fischer Q, Yang Y. LTP and LTD vary with layer in rodent visual cortex. Vision Res. 2004; 44:3377–3380.
Article
46. Wang XF, Daw NW. Long term potentiation varies with layer in rat visual cortex. Brain Res. 2003; 989:26–34.
Article
47. Jiang B, Treviño M, Kirkwood A. Sequential development of long-term potentiation and depression in different layers of the mouse visual cortex. J Neurosci. 2007; 27:9648–9652.
Article
48. Jang HJ, Cho KH, Kim HS, Hahn SJ, Kim MS, Rhie DJ. Age-dependent decline in supragranular long-term synaptic plasticity by increased inhibition during the critical period in the rat primary visual cortex. J Neurophysiol. 2009; 101:269–275.
Article
49. Cauller L. Layer I of primary sensory neocortex: where top-down converges upon bottom-up. Behav Brain Res. 1995; 71:163–170.
Article
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