Biology:Purkinje cell

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Short description: Specialized neuron in the cerebellum


Purkinje cell
PurkinjeCell.jpg
Drawing of pigeon Purkinje cells (A) by Santiago Ramon y Cajal
Details
PronunciationOften pronounced as /pɜːrˈkɪndʒi/ pur-KIN-jee;[1] but Czech pronunciation is (Czech: [ˈpurkɪɲɛ] (About this soundlisten) cells
LocationCerebellum
Shapeflat dendritic arbor
Functioninhibitory projection neuron
NeurotransmitterGABA
Presynaptic connectionsParallel fibers and climbing fibers
Postsynaptic connectionsCerebellar deep nuclei
Anatomical terms of neuroanatomy

Purkinje cells or Purkinje neurons, named for Czech physiologist Jan Evangelista Purkyně who identified them in 1837,[citation needed] are a unique type of prominent large neurons located in the cerebellar cortex of the brain. With their flask-shaped cell bodies, many branching dendrites, and a single long axon, these cells are essential for controlling motor activity. Purkinje cells mainly release GABA (gamma-aminobutyric acid) neurotransmitter, which inhibits some neurons to reduce nerve impulse transmission. Purkinje cells efficiently control and coordinate the body's motor motions through these inhibitory actions.[2][3]

Structure

Neurons (Purkinje cells) located in the cerebellum
Transverse section of a cerebellar folium. (Purkinje cell labeled at center top.)
Silver stain of cerebellum showing Purkinje cells.
Purkinje cells. Bielschowsky stain.
Confocal microscope image of cerebellar Purkinje cells expressing tdTomato

These cells are some of the largest neurons in the human brain (Betz cells being the largest),[4] with an intricately elaborate dendritic arbor, characterized by a large number of dendritic spines. Purkinje cells are found within the Purkinje layer in the cerebellum. Purkinje cells are aligned like dominos stacked one in front of the other. Their large dendritic arbors form nearly two-dimensional layers through which parallel fibers from the deeper-layers pass. These parallel fibers make relatively weaker excitatory (glutamatergic) synapses to spines in the Purkinje cell dendrite, whereas climbing fibers originating from the inferior olivary nucleus in the medulla provide very powerful excitatory input to the proximal dendrites and cell soma. Parallel fibers pass orthogonally through the Purkinje neuron's dendritic arbor, with up to 200,000 parallel fibers[5] forming a Granule-cell-Purkinje-cell synapse with a single Purkinje cell.

Canonically, each adult Purkinje cell receives approximately 500 climbing fiber synapses, all originating from a single climbing fiber from the inferior olive.[6] This has led to the notion that a "highly conserved one-to-one relationship renders Purkinje dendrites into a single computational compartment".[7] However, multi-innervation has now been found that "occurs" in mice among the subset of Purkinje cells with multiple primary dendrites, a dendritic motif that is uncommon in rodents but "predominant" in humans.[7]

Both basket and stellate cells (found in the cerebellar molecular layer) provide inhibitory (GABAergic) input to the Purkinje cell, with basket cells synapsing on the Purkinje cell axon initial segment and stellate cells onto the dendrites.

Purkinje cells send inhibitory projections to the deep cerebellar nuclei, and constitute the sole output of all motor coordination in the cerebellar cortex.

Molecular

The Purkinje layer of the cerebellum, which contains the cell bodies of the Purkinje cells and Bergmann glia, express a large number of unique genes.[8] Purkinje-specific gene markers were also proposed by comparing the transcriptome of Purkinje-deficient mice with that of wild-type mice.[9] One illustrative example is the Purkinje cell protein 4 (PCP4) in knockout mice, which exhibit impaired locomotor learning and markedly altered synaptic plasticity in Purkinje neurons.[10][11] PCP4 accelerates both the association and dissociation of calcium (Ca2+) with calmodulin (CaM) in the cytoplasm of Purkinje cells, and its absence impairs the physiology of these neurons.[10][11][12][13]

Development

Mammalian embryonic research has detailed the neurogenic origins of Purkinje cells.[14] During early development Purkinje cells arise in the ventricular zone in the neural tube, the nervous system´s precursor in the embryo. All cerebellar neurons derive from germinal neuroepithelia from the ventricular zone.[15] Purkinje cells are specifically generated from progenitors in the ventricular neuroepithelium of the embryonic cerebellar primordium.[16] The first cells generated from the cerebellar primordium form a cap over a diamond-shaped cavity of the developing brain called the fourth ventricle forming the two cerebellar hemispheres. The Purkinje cells that develop later are those of the cerebellum's center-lying section called the vermis. They develop in the cerebellar primordium that covers the fourth ventricle and below a fissure-like region called the isthmus of the developing brain. Purkinje cells migrate toward the outer surface of the cerebellar cortex and form the Purkinje cell layer.

Purkinje cells are born during the earliest stages of cerebellar neurogenesis. Neurogenin2, together with neurogenin1, are transiently expressed in restricted domains of the ventricular neuroepithelium during the time-window of Purkinje cell genesis.[17] This spatio-temporal distribution pattern suggests that neurogenins are involved in the specification of phenotypically heterogeneous Purkinje cell subsets, ultimately responsible for constructing the framework of the cerebellar topography.

There is evidence in mice and humans that bone marrow cells either fuse with or generate cerebellar Purkinje cells, and it is possible that bone marrow cells, either by direct generation or by cell fusion, could play a role in repair of central nervous system damage.[18][19][20][21][22] Further evidence points yet towards the possibility of a common stem cell ancestor among Purkinje neurons, B-lymphocytes and aldosterone-producing cells of the human adrenal cortex.[21]

Function

The Purkinje cell protein 4 (PCP4) is markedly immunoreactive in the Purkinje cells of the human cerebellum. From top to bottom 40X, 100X and 200X microscopic magnifications. The immunohistochemistry was performed based on published methods.[10]
Microcircuitry of the cerebellum. Excitatory synapses are denoted by (+) and inhibitory synapses by (-).
MF: Mossy fiber.
DCN: Deep cerebellar nuclei.
IO: Inferior olive.
CF: Climbing fiber.
GC: Granule cell.
PF: Parallel fiber.
PC: Purkinje cell.
GgC: Golgi cell.
SC: Stellate cell.
BC: Basket cell.

Purkinje cells show two distinct forms of electrophysiological activity:

  • Simple spikes occur at rates of 17 – 150 Hz (Raman and Bean, 1999), either spontaneously or when Purkinje cells are activated synaptically by the parallel fibers, the axons of the granule cells.
  • Complex spikes are slow, 1–3 Hz spikes, characterized by an initial prolonged large-amplitude spike, followed by a high-frequency burst of smaller-amplitude action potentials. They are caused by climbing fiber activation and can involve the generation of calcium-mediated action potentials in the dendrites. Following complex spike activity, simple spikes can be suppressed by the powerful complex spike input.[23]

Purkinje cells show spontaneous electrophysiological activity in the form of trains of spikes both sodium-dependent and calcium-dependent. This was initially shown by Rodolfo Llinas (Llinas and Hess (1977) and Llinas and Sugimori (1980)). P-type calcium channels were named after Purkinje cells, where they were initially encountered (Llinas et al. 1989), which are crucial in cerebellar function. Activation of the Purkinje cell by climbing fibers can shift its activity from a quiet state to a spontaneously active state and vice versa, serving as a kind of toggle switch.[24] These findings have been challenged by a study suggesting that such toggling by climbing-fiber inputs occurs predominantly in anaesthetized animals and that Purkinje cells in awake behaving animals, in general, operate almost continuously in the upstate.[25] But this latter study has itself been challenged[26] and Purkinje cell toggling has since been observed in awake cats.[27] A computational model of the Purkinje cell has shown intracellular calcium computations to be responsible for toggling.[28]

Findings have suggested that Purkinje cell dendrites release endocannabinoids that can transiently downregulate both excitatory and inhibitory synapses.[29] The intrinsic activity mode of Purkinje cells is set and controlled by the sodium-potassium pump.[30] This suggests that the pump might not be simply a homeostatic, "housekeeping" molecule for ionic gradients. Instead, it could be a computation element in the cerebellum and the brain.[31] Indeed, a mutation in the Na+-K+ pump causes rapid onset dystonia parkinsonism; its symptoms indicate that it is a pathology of cerebellar computation.[32] Furthermore, using the poison ouabain to block Na+-K+ pumps in the cerebellum of a live mouse induces ataxia and dystonia.[33] Numerical modeling of experimental data suggests that, in vivo, the Na+-K+ pump produces long quiescent punctuations (>> 1 s) to Purkinje neuron firing; these may have a computational role.[34] Alcohol inhibits Na+-K+ pumps in the cerebellum and this is likely how it corrupts cerebellar computation and body co-ordination.[35][36]

Clinical significance

In humans, Purkinje cells can be harmed by a variety of causes: toxic exposure, e.g. to alcohol or lithium; autoimmune diseases; genetic mutations causing spinocerebellar ataxias, gluten ataxia, Unverricht-Lundborg disease, or autism; and neurodegenerative diseases that are not known to have a genetic basis, such as the cerebellar type of multiple system atrophy or sporadic ataxias.[37][38]

Gluten ataxia is an autoimmune disease triggered by the ingestion of gluten.[39] The death of Purkinje cells as a result of gluten exposure is irreversible. Early diagnosis and treatment with a gluten-free diet can improve ataxia and prevent its progression.[37][40] Less than 10% of people with gluten ataxia present any gastrointestinal symptom, yet about 40% have intestinal damage.[40] It accounts for 40% of ataxias of unknown origin and 15% of all ataxias.[40]

The neurodegenerative disease spinocerebellar ataxia type 1 (SCA1) is caused by an unstable polyglutamine expansion within the Ataxin 1 protein. This defect in Ataxin 1 protein causes impairment of mitochondria in Purkinje cells, leading to premature degeneration of the Purkinje cells.[41] As a consequence, motor coordination declines and eventually death ensues.

Some domestic animals can develop a condition where the Purkinje cells begin to atrophy shortly after birth, called cerebellar abiotrophy. It can lead to symptoms such as ataxia, intention tremors, hyperreactivity, lack of menace reflex, stiff or high-stepping gait, apparent lack of awareness of foot position (sometimes standing or walking with a foot knuckled over), and a general inability to determine space and distance.[42] A similar condition known as cerebellar hypoplasia occurs when Purkinje cells fail to develop in utero or die off before birth.

The genetic conditions ataxia telangiectasia and Niemann Pick disease type C, as well as cerebellar essential tremor, involve the progressive loss of Purkinje cells. In Alzheimer's disease, spinal pathology is sometimes seen, as well as loss of dendritic branches of the Purkinje cells.[43] Purkinje cells can also be damaged by the rabies virus as it migrates from the site of infection in the periphery to the central nervous system.[44]

Etymology

Purkinje cells are named after the Czech scientist Jan Evangelista Purkyně, who discovered them in 1839.[citation needed]

See also

List of distinct cell types in the adult human body

References

  1. ↑ Jones, Daniel (2011), Cambridge English Pronouncing Dictionary (18th ed.), Cambridge University Press, ISBN 978-0-521-15255-6 
  2. ↑ "Purkinje cell | Granule cells, Cerebellum & Neurons | Britannica" (in en). 2024-01-05. https://www.britannica.com/science/Purkinje-cell. 
  3. ↑ Paul, Manika S.; Limaiem, Faten (2023), "Histology, Purkinje Cells", StatPearls (Treasure Island (FL): StatPearls Publishing), PMID 31424738, http://www.ncbi.nlm.nih.gov/books/NBK545154/, retrieved 2024-01-16 
  4. ↑ Neuroscience. 4th ed.. Sinauer Associates. 2008. pp. 432–4. ISBN 978-0-87893-697-7. 
  5. ↑ Tyrrell, T; Willshaw, D (1992-05-29). "Cerebellar cortex: its simulation and the relevance of Marr's theory.". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences 336 (1277): 239–57. doi:10.1098/rstb.1992.0059. PMID 1353267. Bibcode: 1992RSPTB.336..239T. 
  6. ↑ Wadiche, JI; Jahr, CE (2001-10-25). "Multivesicular release at climbing fiber-Purkinje cell synapses". Neuron 32 (2): 301–13. doi:10.1016/S0896-6273(01)00488-3. PMID 11683999. 
  7. ↑ 7.0 7.1 Busch, Silas E.; Hansel, Christian (2023). "Climbing fiber multi-innervation of mouse Purkinje dendrites with arborization common to human". Science 381 (6656): 420–427. doi:10.1126/science.adi1024. ISSN 0036-8075. 
  8. ↑ Kirsch, L; Liscovitch, N; Chechik, G (December 2012). Ohler, Uwe. ed. "Localizing Genes to Cerebellar Layers by Classifying ISH Images". PLOS Computational Biology 8 (12): e1002790. doi:10.1371/journal.pcbi.1002790. PMID 23284274. Bibcode: 2012PLSCB...8E2790K. 
  9. ↑ Rong, Y; Wang T; Morgan J (2004). "Identification of candidate purkinje cell-specific markers by gene expression profiling in wild-type and pcd3j mice". Molecular Brain Research 13 (2): 128–145. doi:10.1016/j.molbrainres.2004.10.015. PMID 15582153. 
  10. ↑ 10.0 10.1 10.2 "PCP4: a regulator of aldosterone synthesis in human adrenocortical tissues". Journal of Molecular Endocrinology 52 (2): 159–167. Apr 2014. doi:10.1530/JME-13-0248. PMID 24403568. 
  11. ↑ 11.0 11.1 "Impaired locomotor learning and altered cerebellar synaptic plasticity in pep-19/PCP4-null mice". Mol. Cell. Biol. 31 (14): 2838–44. 2011. doi:10.1128/MCB.05208-11. PMID 21576365. 
  12. ↑ "A new role for IQ motif proteins in regulating calmodulin function.". J. Biol. Chem. 278 (50): 49667–70. 2004. doi:10.1074/jbc.C300372200. PMID 14551202. 
  13. ↑ "PEP-19, an intrinsically disordered regulator of calmodulin signaling". J. Biol. Chem. 284 (12): 7455–64. 2009. doi:10.1074/jbc.M808067200. PMID 19106096. 
  14. ↑ "Purkinje Cell Migration and Differentiation". Handbook of the Cerebellum and Cerebellar Disorders. 2013. pp. 147–178. doi:10.1007/978-94-007-1333-8_9. ISBN 978-94-007-1332-1. 
  15. ↑ "Molecular machinery governing GABAergic neuron specification in the cerebellum". Cerebellum 5 (3): 193–198. 2006. doi:10.1080/14734220600589202. PMID 16997750. 
  16. ↑ "Neurogenesis in the cerebellum". Neuroscientist 14 (1): 91–100. 2008. doi:10.1177/1073858407304629. PMID 17911211. 
  17. ↑ "Comparative analysis of proneural gene expression in the embryonic cerebellum". Dev Dyn 237 (6): 726–735. 2008. doi:10.1002/dvdy.21571. PMID 18498101. 
  18. ↑ "Do bone marrow cells generate neurons?". Archives of Neurology 61 (4): 483–485. 2004. doi:10.1001/archneur.61.4.483. PMID 15096394. https://www.researchgate.net/publication/8608203. 
  19. ↑ "Stable reprogrammed heterokaryons form spontaneously in Purkinje neurons after bone marrow transplant.". Nature Cell Biology 5 (11): 959–966. 2003. doi:10.1038/ncb1053. PMID 14562057. https://www.researchgate.net/publication/9048544. 
  20. ↑ "Fusion of bone-marrow-derived cells with Purkinje neurons, cardiomyocytes and hepatocytes.". Nature 425 (6961): 968–973. 2003. doi:10.1038/nature02069. PMID 14555960. Bibcode: 2003Natur.425..968A. https://www.researchgate.net/publication/9053693. 
  21. ↑ 21.0 21.1 "Pre-B lymphocyte protein 3 (VPREB3) expression in the adrenal cortex: precedent for non-immunological roles in normal and neoplastic human tissues.". Endocrine Pathology 26 (2): 119–28. 2015. doi:10.1007/s12022-015-9366-7. PMID 25861052. https://www.researchgate.net/publication/274075697. 
  22. ↑ "Cell fusion in the brain: two cells forward, one cell back.". Acta Neuropathologica 128 (5): 629–638. 2014. doi:10.1007/s00401-014-1303-1. PMID 24899142. 
  23. ↑ Eric R. Kandel, James H. Schwartz, Thomas M. Jessell (2000). Principles of Neural Science. 4/e. McGraw-Hill. pp.837-40.
  24. ↑ "Bistability of cerebellar Purkinje cells modulated by sensory stimulation.". Nature Neuroscience 8 (2): 202–211. 2005. doi:10.1038/nn1393. PMID 15665875. 
  25. ↑ "Purkinje cells in awake behaving animals operate at the up state membrane potential.". Nature Neuroscience 9 (4): 459–461. 2006. doi:10.1038/nn0406-459. PMID 16568098. 
  26. ↑ "Purkinje cells in awake behaving animals operate at the up state membrane potential–Reply.". Nature Neuroscience 9: 461. 2006. doi:10.1038/nn0406-461. 
  27. ↑ "Pausing Purkinje cells in the cerebellum of the awake cat.". Frontiers in Systems Neuroscience 3: 2. 2009. doi:10.3389/neuro.06.002.2009. PMID 19390639. 
  28. ↑ Forrest MD (2014). "Intracellular Calcium Dynamics Permit a Purkinje Neuron Model to Perform Toggle and Gain Computations Upon its Inputs.". Frontiers in Computational Neuroscience 8: 86. doi:10.3389/fncom.2014.00086. PMID 25191262. 
  29. ↑ "Retrograde inhibition of presynaptic calcium influx by endogenous cannabinoids at excitatory synapses onto Purkinje cells". Neuron 29 (3): 717–27. March 2001. doi:10.1016/S0896-6273(01)00246-X. PMID 11301030. 
  30. ↑ Cymbalyuk, Gennady, ed (December 2012). "The Sodium-Potassium Pump Controls the Intrinsic Firing of the Cerebellar Purkinje Neuron". PLOS ONE 7 (12): e51169. doi:10.1371/journal.pone.0051169. PMID 23284664. Bibcode: 2012PLoSO...751169F. 
  31. ↑ Forrest MD (December 2014). "The sodium-potassium pump is an information processing element in brain computation". Frontiers in Physiology 5 (472): 472. doi:10.3389/fphys.2014.00472. PMID 25566080. 
  32. ↑ Cannon C (July 2004). "Paying the Price at the Pump: Dystonia from Mutations in a Na+/K+-ATPase". Neuron 43 (2): 153–154. doi:10.1016/j.neuron.2004.07.002. PMID 15260948. 
  33. ↑ "The neural substrates of rapid-onset Dystonia-Parkinsonism". Nature Neuroscience 14 (3): 357–65. March 2011. doi:10.1038/nn.2753. PMID 21297628. 
  34. ↑ Forrest MD (2014). "Intracellular Calcium Dynamics Permit a Purkinje Neuron Model to Perform Toggle and Gain Computations Upon its Inputs.". Frontiers in Computational Neuroscience 8: 86. doi:10.3389/fncom.2014.00086. PMID 25191262. 
  35. ↑ Forrest MD (April 2015). "Simulation of alcohol action upon a detailed Purkinje neuron model and a simpler surrogate model that runs >400 times faster". BMC Neuroscience 16 (27): 27. doi:10.1186/s12868-015-0162-6. PMID 25928094. 
  36. ↑ Forrest, Michael (April 2015). "the_neuroscience_reason_we_fall_over_when_drunk". http://www.science20.com/michael_forrest/the_neuroscience_reason_we_fall_over_when_drunk-155301. 
  37. ↑ 37.0 37.1 "Consensus Paper: Neuroimmune Mechanisms of Cerebellar Ataxias.". Cerebellum 15 (2): 213–32. 2016. doi:10.1007/s12311-015-0664-x. PMID 25823827. 
  38. ↑ Jaber M (2017). "The cerebellum as a major player in motor disturbances related to Autistic Syndrome Disorders". Encephale 43 (2): 170–175. doi:10.1016/j.encep.2016.03.018. PMID 27616580. 
  39. ↑ "Spectrum of gluten-related disorders: consensus on new nomenclature and classification". BMC Medicine 10: 13. 2012. doi:10.1186/1741-7015-10-13. PMID 22313950. 
  40. ↑ 40.0 40.1 40.2 "Gluten-related disorders: gluten ataxia". Dig Dis 33 (2): 264–8. 2015. doi:10.1159/000369509. PMID 25925933. 
  41. ↑ "Mitochondrial impairments contribute to Spinocerebellar ataxia type 1 progression and can be ameliorated by the mitochondria-targeted antioxidant MitoQ". Free Radic. Biol. Med. 97: 427–440. August 2016. doi:10.1016/j.freeradbiomed.2016.07.005. PMID 27394174. https://boris.unibe.ch/84445/1/1-s2.0-S0891584916303252-main.pdf. 
  42. ↑ For references, see the extensive references and bibliography at the article on Cerebellar abiotrophy, linked at the beginning of this paragraph.
  43. ↑ Mavroudis, IA; Fotiou, DF; Adipepe, LF; Manani, MG; Njau, SD; Psaroulis, D; Costa, VG; Baloyannis, SJ (November 2010). "Morphological changes of the human purkinje cells and deposition of neuritic plaques and neurofibrillary tangles on the cerebellar cortex of Alzheimer's disease". American Journal of Alzheimer's Disease & Other Dementias 25 (7): 585–91. doi:10.1177/1533317510382892. PMID 20870670. 
  44. ↑ Fekadu, Makonnen (27 March 2009). "Rabies encephalitis, Negri bodies within the cytoplasm of cerebellar Purkinje cell neurons". CDC/Frontal Cortex Inc.. http://frontalcortex.com/?page=oll&topic=24&qid=1130.  Note: not peer-reviewed.

Further reading

External links




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