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[0] Fetz EE, Perlmutter SI, Prut Y, Functions of mammalian spinal interneurons during movement.Curr Opin Neurobiol 10:6, 699-707 (2000 Dec)

[0] Rózsa B, Katona G, Kaszás A, Szipöcs R, Vizi ES, Dendritic nicotinic receptors modulate backpropagating action potentials and long-term plasticity of interneurons.Eur J Neurosci 27:2, 364-77 (2008 Jan)

[0] Sabelli HC, Mosnaim AD, Vazquez AJ, Giardina WJ, Borison RL, Pedemonte WA, Biochemical plasticity of synaptic transmission: a critical review of Dale's Principle.Biol Psychiatry 11:4, 481-524 (1976 Aug)[1] Sulzer D, Rayport S, Dale's principle and glutamate corelease from ventral midbrain dopamine neurons.Amino Acids 19:1, 45-52 (2000)[2] Burnstock G, Do some nerve cells release more than one transmitter?Neuroscience 1:4, 239-48 (1976 Aug)

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ref: -2018 tags: cortex layer martinotti interneuron somatostatin S1 V1 morphology cell type morphological recovery patch seq date: 03-06-2019 02:51 gmt revision:3 [2] [1] [0] [head]

Neocortical layer 4 in adult mouse differs in major cell types and circuit organization between primary sensory areas

  • Using whole-cell recordings with morphological recovery, we identified one major excitatory and seven inhibitory types of neurons in L4 of adult mouse visual cortex (V1).
  • Nearly all excitatory neurons were pyramidal and almost all Somatostatin-positive (SOM+) neurons were Martinotti cells.
  • In contrast, in somatosensory cortex (S1), excitatory cells were mostly stellate and SOM+ cells were non-Martinotti.
  • These morphologically distinct SOM+ interneurons correspond to different transcriptomic cell types and are differentially integrated into the local circuit with only S1 cells receiving local excitatory input.
  • Our results challenge the classical view of a canonical microcircuit repeated through the neocortex.
  • Instead we propose that cell-type specific circuit motifs, such as the Martinotti/pyramidal pair, are optionally used across the cortex as building blocks to assemble cortical circuits.
  • Note preponderance of axons.
  • Classifications:
    • Pyr pyramidal cells
    • BC Basket cells
    • MC Martinotti cells
    • BPC bipolar cells
    • NFC neurogliaform cells
    • SC shrub cells
    • DBC double bouquet cells
    • HEC horizontally elongated cells.
  • Using Patch-seq

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ref: -2012 tags: parvalbumin interneurons V1 perceptual discrimination mice date: 03-06-2019 01:46 gmt revision:0 [head]

PMID-22878719 Activation of specific interneurons improves V1 feature selectivity and visual perception

  • Lee SH1, Kwan AC, Zhang S, Phoumthipphavong V, Flannery JG, Masmanidis SC, Taniguchi H, Huang ZJ, Zhang F, Boyden ES, Deisseroth K, Dan Y.
  • Optogenetic Activation of PV+ interneurons improves neuronal feature selectivity and improves perceptual discrimination (!!!)

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ref: -2016 tags: somatostatin interneurons review date: 02-11-2018 18:08 gmt revision:0 [head]

PMID-27225074 Somatostatin-expressing neurons in cortical networks.

  • Urban-Ciecko J1, Barth AL1.
  • High (~ 10hz) tonic (constitutive) firing rate. All GABA.
  • Somatostatin, a neuropeptide, is of ill-defined role. Unknown when it is released.
  • SST interneurons receive diffuse input from cortical pyramidal cells, but each synapse is of low strength.
  • SST intererneurons are frequently electrically connected through gap junctions, but almost never through electrical synapses. The resulting network can extend for hundreds of microns, and has been shown to cause synchronized firing when cells are active.
  • Common anesthetics (isoflurane, urethane) profoundly silence the SSTs.
  • Wide diversity of axonal and dendritic branching patterns, targeting both apical (20%) and distal pyramidal cell dendrites.
  • SST neuron activity is reduced in Dravet syndrome.
  • SST neurons have also been implicated in schizophrenia; affected individuals show decreased SST mRNA and mislocalization of SST interneurons.

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ref: Fetz-2000.12 tags: motor control spinal neurons interneurons movement primitives Fetz review tuning date: 01-03-2012 23:08 gmt revision:4 [3] [2] [1] [0] [head]

PMID-11240278[0] Functions of mammalian spinal interneurons during movement

  • this issue of current opinion in neuro has many reviews of motor control
  • points out that the Bizzi results (they microstimulated & observed a force-field-primitive type organization)
    • others have found that this may be a consequence of decerebration + the structure of the biomechanical groupings of muscles. (see 'update').
  • intraspinal electrodes in the cat provide a secure and reliable method of eliciting forces and movements.
  • CM (corticomotor) cells more often represent synergistic groups of muscles, whereas premotor spinal interneurons are organized to target specific muscles.
    • CMs are therefore more strictly recruited for particular movements.
  • interneurons (IN) are, of course, arrayed in such a way so that antagonist and agonist muscles cross-inhibit eachother (for efficiency)
    • however, we are still able to control the endpoint impedance of the arm - how?
  • spinal interneurons modulate activity during wait period prior to movement!
    • there might be substantial interaction between the cortex and spinal cord.. subjects asked to imagine pressing a foot pedal showed enhanced reflexes in the involved soleus muscle.
      • cognitive priming?
  • spinal reflexes are strongly modulated in movement.

____References____

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ref: RAzsa-2008.01 tags: nAChR nicotinic acetylchoine receptor interneurons backpropagating LTP hippocampus date: 10-08-2008 17:37 gmt revision:0 [head]

PMID-18215234[0] Dendritic nicotinic receptors modulate backpropagating action potentials and long-term plasticity of interneurons.

  • idea: nAChRs are highly permeable to Ca+2, LTP is dependent on Ca2+, so they tested nAChR -> LTP in interneurons of rat hippocampus using whole-cell electrophysiology and 2-photon imaging.
  • Here we show that precisely timed activation of dendritic α7-nAChRs boosts the induction of LTP by excitatory postsynaptic potentials (EPSPs) and synaptically triggered dendritic Ca2+ transients.
  • suggest that this rapid (ionotropic) method of memory encoding and retrieval via LTP/D facilitated by acetylcholine.
  • I haven't read much of the article, since it is much out of my field of experience.

____References____

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ref: Sabelli-1976.08 tags: anatomy of the spinal cord interneurons pyramidal tract commissure reflexes date: 04-23-2007 05:12 gmt revision:1 [0] [head]

Anatomy of the spinal cord

  • wow! detailed!!
  • the spinal cord is remarkably complex (of course, considering how old it is and how important it is for structuring movement and locomotion..well..most animals)
  • there is a lot of well-organized circuitry in the spinal cord mediating adaptive phenomena and reflexes like the clasp knife reflex (upper motoneuron disease where the resistance to flexion abruptly melts away when the joint is fully flexed)

____References____