Ontogenesis in the CNS neurogenesis during embryonic development
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1 Ontogenesis in the CNS neurogenesis during embryonic development
2 Formation of the neural tube neural groove neural plate neural groove neural crest notochord neural tube
3 The developing neuroepithelium ventricular zone (pseudostratified epithelium)
4 ventricular zone Interkinetic nuclear migration within the ventricular zone basal (pial) surface neuroepithel stem cell [NE (stem) cell] cilium apical (ventricular) surface Tsai et al., Nat Neurosci Dec;13(12): radial shape, anchored to pial and ventricular ECM; ventricular cilium - centrosome localized near the cilium, microtubule + end towards the pia - nuclear movement based on dynein / kinesin (KIF1A) activity along cell cycle - apical mitosis: symmetric cell divisions, expansion in cell number/surface
5 Interkinetic nuclear migration within the ventricular zone
6 Interkinetic nuclear migration within the ventricular zone Noctor et al. neuroepithel stem cell [NE (stem) cell; NEC] -> radial glia - radial shape, anchored to pial and ventricular ECM; ventricular cilium - centrosome localized near the cilium, microtubule + end towards the pia - nuclear movement based on dynein / kinesin (KIF1A) activity along cell cycle - apical mitosis: symmetric / asymmetric cell divisions
7 The radial glia (RG) migráló neuronális prekurzorok radiális glia VZ: ventricular zone PP: preplate SVZ: subventricular zone CP: cortical plate IZ: intermedier zone MZ: marginal zone SP: subplate E30 (human) E31-32 E45 E55 14w Bystron et al; Nat Rev Neurosci Feb;9(2): Rakic P. J. Comp. Neurol. 1972, 145: originally: radial migratory railway from the VZ towards the pial surface in the neocortex transient phenotype, develops into astrocytes protomap hypothesis (Rakic)
8 The radial glia (RG) transition from NECs, transient neuronal stem cells nestin+; glial features (GLAST, S100, GFAP, vimentin, BLBP) direct and indirect (via basal progenitors / transient amplifying cells / neuronal precursors / neuronal progenitors) ways of generating neurons neurogenic phase perinatally gliogenic phase: formation of astrocytes / oligodendrocytes (<E11; mouse)
9 Radial glia lineage in the dorsal telencephalon IP: intermedier progenitor = basal progenitor = transit amplifying cell = neuronal progenitor = neuronal precursor (NPC)
10 proliferative effect Wnt / Shh / Par signaling Factors influencing RG s fate Notch-Delta synchronisation [Ca 2+ ] IC GABA, (Glu) retinoids differentiation GABA, Glu Elias, Kriegstein CNTF/LIF; TGFb
11 Morphogenes influencing cortical neurogenesis
12 Morphogenes influencing cortical neurogenesis
13 Environmental clues influencing cortical neurogenesis
14 Adult neurogenesis
15 a long story... dogma: no neurogenesis within the adult brain 50's: 3H-timidin labeling to mark dividing cells in vivo within the brain 60's, Altman: newborn neurons within the rodent neocortex, dentate gyrus (DG) and in the olfactory bulb 70-80's, Kaplan: new neurons within the hippocampus survive for many years and form functional circuits 80's: functional neurogenesis is required for learning new songs (high vocal center), (Nottebohm) 1992: neurosphere and NSCs isolated from adult rodent brain (Reynolds, Weiss) 1999: neurosphere and NSCs isolated from adult human brain (Kukekov) thousands of papers : who is the neural stem cell??? -> GFAP+ glia cell
16 Neurogenesis within the adult brain songbirds: high vocal center (striatum) subventricular zone (SVZ) mammals: hippocampus dentate gyrus (GD) subgranular zone (SGZ) Alvarez-Buylla and Garcı a-verdugo J. Neurosci., 2002, 22(3): Nottebohm J. Neurosci., 2002, 22(3): GABAergic inhibitory granule cells; dopaminergic periglomerular cells in the olfactory bulb GD Glu-ergic granule cells
17 Neurogenesis within the adult brain BrdU+ cells
18 Neurogenesis within the adult brain
19 Adult neural stem cells within the SVZ SVZ: astrocyte B cell [radial glia-like cell]: self-renewing, GFAP + one (or more) cilium towards the lumen C cell: fast division, transient amplifying cell A cell: committed, migrating neuroblast ependyma: noggin production Nat Rev Neurosci (niche); cilia in vivo: only OB neurogenesis in vitro multipotency: neuron, oligodendroglia, astrocyte can be formed differentiation is determined by the local micro-environment (niche)
20 Adult neural stem cells within the SVZ
21 RMS: neuronal chain migration RMS: rostral migratory stream chain migration of interneurons - PSA-NCAM, EphB2 / ephrin-b2, neuregulin / Erb4 within the OB (olfactory bulb), radial migration starts (reelin)
22 SVZ neurogenesis integration of new neurons neurogenesis within the olfactory system: central: (accessory) olfactory bulb - granule cell - periglomerular cell periphery: vomeronasal organ - sensory neurons
23 SVZ neurogenesis integration of new neurons
24 SVZ neurogenesis integration of new neurons constant supply of new neurons: - OSN: derived from MOE precursors, axons are projected into the glomeruli; same receptor same glomerulus - PG: dendro-dendritic synapses formed on the mitral cells - GC: recurrent dendro-dendritic synapses on the lateral dendrites of the mitral neurons (lack of axons) AOB: accessory olfactory bulb; DG: dentate gyrus; LV: lateral ventricle; MOB: main olfactory bulb; MOE: main olfactory epithelium; RMS: rostral migratory stream; VNO: vomeronasal organ OSN: olfactory sensory neuron PG: periglomerular neuron GC: granule cell (szemcsesejt) MC: mitral cell dendro-dendritic synapses
25 Neurogenesis within the adult SVZ
26 Neurogenesis within the adult SVZ
27 Functional importance of SVZ neurogenesis daily replacement of 1% of neurons within the OB (~97% granule cells) critical period for survival between 2-6 weeks (half of new neurons die) constant turnover of sensory neurons -> constant turnover of interneurons within the (A)OB (new neurons should integrate into the network) new neurons: strong inhibitory effects on the glomeruli (PG neurons) or on the mitral/tufted cells (granule cells) local networks: processing olfactory stimuli depending on memory, pregnancy, behavior...
28 Adult neural stem cells within the SGZ SGZ: astrocyte Alvarez-Buylla*, A. Lim Neuron, Vol. 41, , 2004, Doetsch F. Nat Neurosci B cell (radial astrocyte, type 1 cell): self-renewal, GFAP + D cell (type 2 cell): neuronal progenitor (neuroblast) G cell: granule cell GD granule neuron: mature Glu-ergic interneuron
29 Adult neural stem cells within the SGZ radial astrocytes (B cells) are directly derived from radial glia (?)
30 Adult neural stem cells within the SGZ
31 Integration on newly born SGZ neurons
32 Integration on newly born SGZ neurons no synaptic inputs during the first week for young GCs, only tonic GABA activation + slow maturation - GABA A receptors; high [Cl - ] IC -> depolarizing action of tonically released GABA - neuronal activity starts ~3w - hyperpolarizing GABA activity develops around 4w - Gluergic inputs develop later - increased activitydependent synaptic plasticity during maturation
33 Integration on newly born SGZ neurons
34 Neurogenesis within the adult SGZ
35 Neurogenesis within the adult SGZ
36 Functional role of new SGZ neurons morphological and electrophysiological maturation (~4-6 weeks) spatial memory, explicit learning responsible for pattern separation malfunctioning leads to pathological brain functions (can be a cause and a consequence, as well): - epilepsy - depression, anxiety - stress new neurons: activation of local interneurons -> strong inhibition at the network level; during maturation, increased sensitivity to activity-dependent plasticity
37 Glial-neuronal transition during adult neurogenesis
38 Neurogenesis within the CNS Solid arrows are supported by experimental evidence; dashed arrows are hypothetical. Colors depict symmetric, asymmetric, or direct transformation. IPC, intermediate progenitor cell; MA, mantle; MZ, marginal zone; NE, neuroepithelium; nipc, neurogenic progenitor cell; oipc, oligodendrocytic progenitor cell; RG, radial glia; SVZ, subventricular zone; VZ, ventricular zone.
39 Neurogenesis within the CNS
40 Lineage tree of neural stem cells
41 Lineage tree of neural stem cells
42 Essay questions Describe the cellular composition of the ventricular zone (VZ)! Explain the functional importance of VZ cells in respect to neurogenesis! / Hogyan épül fel az embrionális ventrikuláris zóna (VZ)? Milyen sejt(ek) alkotjá(k)? Milyen szerepet tölt be a VZ az idegrendszer fejlődése során? What kind of role do radial glial cells play in neurogenesis? Where and when can they be found within the CNS? What kind of factors regulate their proliferation and differentiation? / Hol található meg és milyen tulajdonságokkal, markerekkel jellemezhető a radiális glia? Milyen szerepet tölt be az idegrendszer fejlődése során? Milyen faktorok irányítják a proliferációjukat, illetve az elköteleződési lépéseket? Where does neurogenesis take place in the adult CNS? Give a brief overview of the newly born neurons! Explain their functional importance! / Hol keletkeznek új idegsejtek a felnőtt idegrendszerben? Hol és milyen szerepet töltenek be az újonnan képződő idegsejtek? Compare the characteristics (similarities and differences) between the steps of adult neurogenesis within the SVZ and SGZ! / Hasonlítsa össze az SVZ-ben és az SGZ-ben folyó felnőttkori neurogenezis főbb sajátságait (hasonlóságait és a különbségeket)!
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