|
Input Receptors |
Intrinsic Currents |
Output Transmitters |
Distal apical dendrite
|
-----
|
Glutamate
|
Recordings using infrared-guided laser stimulation combined with whole cell recordings revealed a highly nonuniform distribution. Hot spots, with amplitude and integral of glutamate-evoked responses three times larger than responses evoked at neighboring sites, were detected. It appeared that the larger responses evoked resulted from an increase in activation of both AMPA and NMDA receptors. There was no correlation with branch points (Frick A et al, 20012 ). |
|
GabaA
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
|
GabaB
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
|
5-HT2
|
Immunolabeling was observed in soma and dendrites of layer V pyramidal cells in the frontal cortex (Xu T and Pandey SC, 2000 [rat]5 ). |
|
NMDA
|
Apical dendrites of L6 pyramidal neurons in somatosensory cortex are similar to L5 and L2/3 in that they includeNMDA-dependent electrogenesis (Ledergerber D and Larkum ME, 20107 ). |
|
I K
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I A
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I Calcium
|
The developmental evolution of Ca-dependent spikes in the tuft was investigated using simultaneous somatic and dendritic recordings (Zhu JJ, 2000 [rat]11 ). Using calcium imaging, calcium waves in layer 2/3 and layer 5 neocortical somatosensory pyramidal neurons were examined in slices from 2- to 8-week-old rats (Larkum ME et al, 200312 ). |
I h
|
Ih conductance causes voltage attunuation and is more concentrated in dendrites than in soma (Stuart G and Spruston N, 199813 ). The subcellular distribution and biophysical properties of this current were studied in cell-attached patches. Up to approximately 400um from the soma a low density of channels was found, with a 20-fold increase in the apical distal dendrite. The findings suggest that integration of synaptic input to the apical tuft and the basal dendrites occurs spatially independently due to the high Ih channel density in the apical tuft that increases the electrotonic distance between these two compartments in comparison to a passive dendrite (Berger T et al, 2001 [rat]14 ). A linear increase has been found (9 pA/100um) in the density of these channels with distance from soma. It was suggested that this generates site independence of EPSP time course (Williams SR and Stuart GJ, 200015 ). |
I p,q
|
Many authors have described the activation of dendritic voltage activated Ca channels (Yuste R and Denk W, 1995 [rat]21 ). |
I Na,t
|
Numerous authors (e.g., (Wong RK et al, 197922 ). Benardo et al 1982; (Huguenard JR et al, 1989 [rat]23 ). have provided evidence for active properties. Dual patch recordings show backpropagating impulses (Stuart GJ and Sakmann B, 1994 [rat]24 ). (Ulrich D and Stricker C, 200025 ). |
I Na,p
|
This persistant conductance may be activated by the NMDA receptor depolarization, providing a mechanism for graded, voltage dependent EPSP amplification (Schwindt PC and Crill WE, 1995 [rat]20 ). |
|
|
Middle apical dendrite
|
-----
|
Glutamate
|
Recordings using infrared-guided laser stimulation combined with whole cell recordings revealed a highly nonuniform distribution. Hot spots, with amplitude and integral of glutamate-evoked responses three times larger than responses evoked at neighboring sites, were detected. It appeared that the larger responses evoked resulted from an increase in activation of both AMPA and NMDA receptors. There was no correlation with branch points (Frick A et al, 20012 ). |
|
GabaA
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
|
GabaB
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
|
5-HT2
|
Immunolabeling was observed in soma and dendrites of layer V pyramidal cells in the frontal cortex (Xu T and Pandey SC, 2000 [rat]5 ). |
|
I K
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I A
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I h
|
The subcellular distribution and biophysical properties of this current were studied in cell-attached patches. Up to approximately 400um from the soma a low density of channels was found, with a 20-fold increase in the apical distal dendrite. The findings suggest that integration of synaptic input to the apical tuft and the basal dendrites occurs spatially independently due to the high Ih channel density in the apical tuft that increases the electrotonic distance between these two compartments in comparison to a passive dendrite (Berger T et al, 2001 [rat]14 ). A linear increase has been found (9 pA/100um) in the density of these channels with distance from soma. It was suggested that this generates site independence of EPSP time course (Williams SR and Stuart GJ, 200015 ). |
I N
|
Dendritic fluorescence imaging showed that Ca2+ channels of several subtypes mediated the AP-evoked fluorescence transient in the proximal (100-170 microns) apical dendrite. The fluorescence resulted from Ca2+ entry through L, N, and P-type channels, and through Ca2+ channels (R-type) not sensitive to L-, N- and P-type Ca2+ channel blockers (Markram H et al, 1995 [rat]19 ). |
I L high threshold
|
Dendritic fluorescence imaging showed that Ca2+ channels of several subtypes mediated the AP-evoked fluorescence transient in the proximal (100-170 microns) apical dendrite. The fluorescence resulted from Ca2+ entry through L, N, and P-type channels, and through Ca2+ channels (R-type) not sensitive to L-, N- and P-type Ca2+ channel blockers (Markram H et al, 1995 [rat]19 ). |
I Calcium
|
Dendritic fluorescence imaging showed that Ca2+ channels of several subtypes mediated the AP-evoked fluorescence transient in the proximal (100-170 microns) apical dendrite. The fluorescence resulted from Ca2+ entry through L, N, and P-type channels, and through Ca2+ channels (R-type) not sensitive to L-, N- and P-type Ca2+ channel blockers (Markram H et al, 1995 [rat]19 ). Using calcium imaging, calcium waves in layer 2/3 and layer 5 neocortical somatosensory pyramidal neurons were examined in slices from 2- to 8-week-old rats (Larkum ME et al, 200312 ). |
I Na,p
|
This persistant conductance may be activated by the NMDA receptor depolarization, providing a mechanism for graded, voltage dependent EPSP amplification (Schwindt PC and Crill WE, 1995 [rat]20 ). |
I Na,t
|
Numerous authors (e.g., (Wong RK et al, 197922 ). Benardo et al 1982; (Huguenard JR et al, 1989 [rat]23 ). have provided evidence for active properties. Dual patch recordings show backpropagating impulses (Stuart GJ and Sakmann B, 1994 [rat]24 ). (Ulrich D and Stricker C, 200025 ). |
I p,q
|
Many authors have described the activation of dendritic voltage activated Ca channels (Yuste R and Denk W, 1995 [rat]21 ). |
|
|
Proximal apical dendrite
|
-----
|
Glutamate
|
Recordings using infrared-guided laser stimulation combined with whole cell recordings revealed a highly nonuniform distribution. Hot spots, with amplitude and integral of glutamate-evoked responses three times larger than responses evoked at neighboring sites, were detected. It appeared that the larger responses evoked resulted from an increase in activation of both AMPA and NMDA receptors. There was no correlation with branch points (Frick A et al, 20012 ). |
|
GabaA
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
|
GabaB
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
|
5-HT2
|
Immunolabeling was observed in soma and dendrites of layer V pyramidal cells in the frontal cortex (Xu T and Pandey SC, 2000 [rat]5 ). |
|
I K
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I h
|
The subcellular distribution and biophysical properties of this current were studied in cell-attached patches. Up to approximately 400um from the soma a low density of channels was found, with a 20-fold increase in the apical distal dendrite. The findings suggest that integration of synaptic input to the apical tuft and the basal dendrites occurs spatially independently due to the high Ih channel density in the apical tuft that increases the electrotonic distance between these two compartments in comparison to a passive dendrite (Berger T et al, 2001 [rat]14 ). A linear increase has been found (9 pA/100um) in the density of these channels with distance from soma. It was suggested that this generates site independence of EPSP time course (Williams SR and Stuart GJ, 200015 ). |
I A
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I Calcium
|
Dendritic fluorescence imaging showed that Ca2+ channels of several subtypes mediated the AP-evoked fluorescence transient in the proximal (100-170 microns) apical dendrite. The fluorescence resulted from Ca2+ entry through L, N, and P-type channels, and through Ca2+ channels (R-type) not sensitive to L-, N- and P-type Ca2+ channel blockers (Markram H et al, 1995 [rat]19 ). Using calcium imaging, calcium waves in layer 2/3 and layer 5 neocortical somatosensory pyramidal neurons were examined in slices from 2- to 8-week-old rats (Larkum ME et al, 200312 ). |
I L high threshold
|
Dendritic fluorescence imaging showed that Ca2+ channels of several subtypes mediated the AP-evoked fluorescence transient in the proximal (100-170 microns) apical dendrite. The fluorescence resulted from Ca2+ entry through L, N, and P-type channels, and through Ca2+ channels (R-type) not sensitive to L-, N- and P-type Ca2+ channel blockers (Markram H et al, 1995 [rat]19 ). |
I N
|
Dendritic fluorescence imaging showed that Ca2+ channels of several subtypes mediated the AP-evoked fluorescence transient in the proximal (100-170 microns) apical dendrite. The fluorescence resulted from Ca2+ entry through L, N, and P-type channels, and through Ca2+ channels (R-type) not sensitive to L-, N- and P-type Ca2+ channel blockers (Markram H et al, 1995 [rat]19 ). |
I Na,p
|
This persistant conductance may be activated by the NMDA receptor depolarization, providing a mechanism for graded, voltage dependent EPSP amplification (Schwindt PC and Crill WE, 1995 [rat]20 ). |
I Na,t
|
Numerous authors (e.g., (Wong RK et al, 197922 ). Benardo et al 1982; (Huguenard JR et al, 1989 [rat]23 ). have provided evidence for active properties. Dual patch recordings show backpropagating impulses (Stuart GJ and Sakmann B, 1994 [rat]24 ). (Ulrich D and Stricker C, 200025 ). |
I p,q
|
Many authors have described the activation of dendritic voltage activated Ca channels (Yuste R and Denk W, 1995 [rat]21 ). |
|
Glutamate
|
| Dual whole-cell recordings in acute slices showed that kainate receptors located on presynaptic interneuron terminals can be activated by glutamate released from the somatodendritic compartment of the postsynaptic pyramidal cells (Ali AB et al, 200128 ). |
|
Distal basal dendrite
|
|
I h
|
The subcellular distribution and biophysical properties of this current were studied in cell-attached patches. The basal dendrites were practically devoid of this conductance (Berger T et al, 2001 [rat]14 ). |
|
|
Middle basal dendrite
|
|
I h
|
The subcellular distribution and biophysical properties of this current were studied in cell-attached patches. The basal dendrites were practically devoid of this conductance (Berger T et al, 2001 [rat]14 ). |
|
|
Proximal basal dendrite
|
|
I h
|
The subcellular distribution and biophysical properties of this current were studied in cell-attached patches. The basal dendrites were practically devoid of this conductance (Berger T et al, 2001 [rat]14 ). |
|
|
Soma
|
Basket Cell Interneuron terminals (T)
|
GabaA
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
Basket Cell Interneuron terminals (T)
|
GabaB
|
The distribution of GABAA and GABAB receptors was studied with patch-clamp recording in combination with infrared-guided laser stimulation to release GABA photolytically. The data suggest that relatively more GABAA receptors are located at the apical dendrite and relatively more GABAB receptors near the soma (Eder M et al, 20011 ). |
|
5-HT2
|
Immunolabeling was observed in soma and dendrites of layer V pyramidal cells in the frontal cortex (Xu T and Pandey SC, 2000 [rat]5 ). |
|
NMDA
|
The rate of NMDAR channel opening was studied in response to depolarisations at different times after brief (1 ms) and sustained (4.6 s) applications of glutamate to nucleated patches from neocortical pyramidal neurons (Kampa BM et al, 20046 ). |
|
I h
|
The subcellular distribution and biophysical properties of this current were studied in cell-attached patches. Up to approximately 400um from the soma a low density of channels was found, with a 20-fold increase in the apical distal dendrite. The findings suggest that integration of synaptic input to the apical tuft and the basal dendrites occurs spatially independently due to the high Ih channel density in the apical tuft that increases the electrotonic distance between these two compartments in comparison to a passive dendrite (Berger T et al, 2001 [rat]14 ). A linear increase has been found (9 pA/100um) in the density of these channels with distance from soma. It was suggested that this generates site independence of EPSP time course (Williams SR and Stuart GJ, 200015 ). |
I A
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I K,Ca
|
Dual patch-clamp recordings showed that Ca-activated K+ (BK) channels were not triggered by neuronal action potentials in normal slices and only opened as neuronal responses deteriorated (smaller or absent spikes) and in a spike-independent manner, suggesting that BK channels may activate only in pathological conditions (Kang J et al, 2000 [rat]16 ). Intracellular recordings from sensorimotor cortex suggested that what activate IKCa persistently would not be calcium but some biochemical modification triggered by NMDA receptor activation (Kitagawa H et al, 2000 [cat]17 ). Ca2+-activated K+ currents were studied using whole-cell patch-clamp recordings from freshly dissociated mouse neocortical pyramidal neurons (Sun X et al, 200318 ). |
I Na,t
|
|
I K
|
Types and distribution of voltage-gated K+ channels in the soma and apical dendrites were studied in acute brain slices (Korngreen A and Sakmann B, 20008 ). The amplitude of ensemble K+ currents in cell-attached patches decreased along the apical dendrite as the distance from the soma increased, with a slope of -0.9 +/- 0.3 pA per 100um. In nucleated outside-out patches from soma in acute slices of sensorimotor cortex from 13- to 15-day-old Wistar rats some patches contained only I-A-like channels, other contained only IK-like channels that did not inactivate or inactivated slowly, and the remainder contained mixtures of both types. The amount of IA and IK depended weakly on distance along the primary apical dendrite from the soma. The amplitude of IA increased, while the amplitude of IK decreased (Bekkers JM, 2000 [rat]9 ). (Bekkers JM, 2000 [rat]10 ). |
I Na,p
|
This persistant conductance may be activated by the NMDA receptor depolarization, providing a mechanism for graded, voltage dependent EPSP amplification (Schwindt PC and Crill WE, 1995 [rat]20 ). |
I CAN
|
using whole-cell patch-clamp recordings from freshly dissociated mouse neocortical pyramidal neurons showed that Ca2+-dependent K+ currents were activated by Ca2+ entry through both N- and L-type channels (Sun X et al, 200318 ). |
I L high threshold
|
using whole-cell patch-clamp recordings from freshly dissociated mouse neocortical pyramidal neurons showed that Ca2+-dependent K+ currents were activated by Ca2+ entry through both N- and L-type channels (Sun X et al, 200318 ). |
I Calcium
|
It has been suggested that the pharmacologically separable components of the HVA current in these neurons do not differ significantly in kinetics (Brown AM et al, 1993 [rat]26 ). Using calcium imaging, calcium waves in layer 2/3 and layer 5 neocortical somatosensory pyramidal neurons were examined in slices from 2- to 8-week-old rats (Larkum ME et al, 200312 ). |
|
Glutamate
|
| Dual whole-cell recordings in acute slices showed that kainate receptors located on presynaptic interneuron terminals can be activated by glutamate released from the somatodendritic compartment of the postsynaptic pyramidal cells (Ali AB et al, 200128 ). |
|
Axon hillock
|
Chandelier Cell Interneuron terminals (T)
|
GabaA
|
|
Chandelier Cell Interneuron terminals (T)
|
GabaB
|
|
|
|
|
Axon fiber
|
|
|
|
Axon terminal
|
|
D1
|
Dual whole-cell recordings in connected cell pairs suggested that attenuation of local horizontal excitation by dopamine is through D1 actions at a presynaptic site (Gao WJ et al, 20014 ). |
|
|
Glutamate
|
Spiny Neuron: Ded and Thalamic Relay Neuron: Ded and Superficial Pyramidal Neurons
| From cerebral cortex (McGeer PL et al, 1977 [mammal]27 ). |
|
|
|
GabaA
|
(Castro-Alamancos MA, 20003 ). |
|
GabaB
|
(Castro-Alamancos MA, 20003 ). |
|
|
|