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Transcript of Lecture V. Cell Birth and Death Bio 3411 Wednesday September 15, 2010 1 Lecture V. Cell Birth &...
Lecture V. Cell Birth and Death
Bio 3411 Wednesday
September 15, 2010
September 15, 2010 1Lecture V. Cell Birth & Death
Readings
NEUROSCIENCE: 4th ed, pp 596-609 (end of Chapter 23: Construction of Neural Circuits)References posted:• †Abbott, A. (2009). Neuroscience: One hundred years of Rita. Nature, 458(7238), 564-567.
• †Berry, D. (2006). Apoptosis and signal transduction. http://www.wehi.edu.au/education/wehi-tv/?page=2 .
• †Cohen, S. (1987). Autobiography. http://nobelprize.org/nobel_prizes/medicine/laureates/1986/cohen-autobio.html
• †Hengartner, M. O. (2000). The biochemistry of apoptosis. Nature, 407(6805), 770-776.
• †Hollyday, M. (2001). Viktor Hamburger (1900-2001): A rememberance. Developmental Biology, 236(1), 1-2.
• †Raff, M. (1998). Cell suicide for beginners. Nature, 396(6707), 119-122.
______________________
†(pdfs on course websites: [http://artsci.wustl.edu/~bio3411/] & [http://www.nslc.wustl.edu/courses/Bio3411/bio3411.html])
2Lecture V. Cell Birth & DeathSeptember 15, 2010
Cited A
• Acehan, D., Jiang, X., Morgan, D. G., Heuser, J. E., Wang, X., & Akey, C. W. (2002). Three-dimensional structure of the apoptosome: implications for assembly, procaspase-9 binding, and activation. Mol Cell, 9(2), 423-432.
• Brenner, S. (1973). The genetics of behaviour. Br Med Bull, 29(3), 269-271.• Cleary, M. L., Smith, S. D., & Sklar, J. (1986). Cloning and structural analysis of cDNAs for bcl-2 and a
hybrid bcl-2/immunoglobulin transcript resulting from the t(14;18) translocation. Cell, 47(1), 19-28.• Cohen, S., Levi-Montalcini, R., & Hamburger, V. (1954). A Nerve Growth-Stimulating Factor Isolated from
Sarcom as 37 and 180. Proc Natl Acad Sci U S A, 40(10), 1014-1018.• Cowan, W. M., & Wenger, E. (1967). Cell loss in the trochlear nucleus of the chick during normal
development and after radical extirpation of the optic vesicle. J Exp Zool, 164(2), 267-280.• Ellis, R. E., & Horvitz, H. R. (1991). Two C. elegans genes control the programmed deaths of specific cells
in the pharynx. Development, 112(2), 591-603.• Ellis, R. E., Yuan, J. Y., & Horvitz, H. R. (1991). Mechanisms and functions of cell death. Annu Rev Cell Biol,
7, 663-698.• Fesik, S. W. (2000). Insights into programmed cell death through structural biology. Cell, 103(2), 273-282.• Gross, A., McDonnell, J. M., & Korsmeyer, S. J. (1999). BCL-2 family members and the mitochondria in
apoptosis. Genes Dev, 13(15), 1899-1911.• Haldar, S., Reed, J. C., Beatty, C., & Croce, C. M. (1990). Role of bcl-2 in growth factor triggered signal
transduction. Cancer Res, 50(22), 7399-7401.
September 15, 2010 Lecture V. Cell Birth & Death 3
• Hamburger, V. (1958). Regression versus peripheral control of differentiation in motor hypoplasia. Am J Anat, 102(3), 365-409.
• Hamburger, V. (1975). Cell death in the development of the lateral motor column of the chick embryo. J Comp Neurol, 160(4), 535-546.
• Hamburger, V. (1977). The developmental history of the motor neuron. Neurosci Res Program Bull, 15 Suppl, iii-37.
• Kerr, J. F., Wyllie, A. H., & Currie, A. R. (1972). Apoptosis: a basic biological phenomenon with wide-ranging implications in tissue kinetics. Br J Cancer, 26(4), 239-257.
• Korsmeyer, S. J. (1992). Bcl-2: an antidote to programmed cell death. Cancer Surv, 15, 105-118.• Landmesser, L., & Pilar, G. (1974). Synaptic transmission and cell death during normal ganglionic
development. J Physiol, 241(3), 737-749.• Levi-Montalcini, R., & Hamburger, V. (1951). Selective growth stimulating effects of mouse sarcoma on
the sensory and sympathetic nervous system of the chick embryo. J Exp Zool, 116(2), 321-361.• Levi-Montalcini, R., Meyer, H., & Hamburger, V. (1954). In vitro experiments on the effects of mouse
sarcomas 180 and 37 on the spinal and sympathetic ganglia of the chick embryo. Cancer Res, 14(1), 49-57.
• Schlesinger, P. H., Ferdani, R., Liu, J., Pajewska, J., Pajewski, R., Saito, M., Shabany, H., & Gokel, G. W. (2002). SCMTR: a chloride-selective, membrane-anchored peptide channel that exhibits voltage gating. J Am Chem Soc, 124(9), 1848-1849.
• Sulston, J. E., & Horvitz, H. R. (1977). Post-embryonic cell lineages of the nematode, Caenorhabditis elegans. Dev Biol, 56(1), 110-156.
September 15, 2010 Lecture V. Cell Birth & Death 4
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• Sulston, J. E., Schierenberg, E., White, J. G., & Thomson, J. N. (1983). The embryonic cell lineage of the nematode Caenorhabditis elegans. Dev Biol, 100(1), 64-119.
• Vaux, D. L., Cory, S., & Adams, J. M. (1988). Bcl-2 gene promotes haemopoietic cell survival and cooperates with c-myc to immortalize pre-B cells. Nature, 335(6189), 440-442.
• White, J. G., Horvitz, H. R., & Sulston, J. E. (1982). Neurone differentiation in cell lineage mutants of Caenorhabditis elegans. Nature, 297(5867), 584-587.
• Wiesmann, C., Ultsch, M. H., Bass, S. H., & de Vos, A. M. (1999). Crystal structure of nerve growth factor in complex with the ligand-binding domain of the TrkA receptor. Nature, 401(6749), 184-188.
• Xue, D., & Horvitz, H. R. (1997). Caenorhabditis elegans CED-9 protein is a bifunctional cell-death inhibitor. Nature, 390(6657), 305-308.
• Xue, D., Shaham, S., & Horvitz, H. R. (1996). The Caenorhabditis elegans cell-death protein CED-3 is a cysteine protease with substrate specificities similar to those of the human CPP32 protease. Genes Dev, 10(9), 1073-1083.
• Yang, X., Chang, H. Y., & Baltimore, D. (1998). Essential role of CED-4 oligomerization in CED-3 activation and apoptosis. Science, 281(5381), 1355-1357.
• Yuan, J. Y., & Horvitz, H. R. (1990). The Caenorhabditis elegans genes ced-3 and ced-4 act cell autonomously to cause programmed cell death. Dev Biol, 138(1), 33-41.
September 15, 2010 Lecture V. Cell Birth & Death 5
Cited C
What the last Lecture was about
• Mesoderm induces neuroectoderm in overlying ectoderm that gives rise to neuronal or epidermal cells.
• The “default” state of neuroectodermal cells is neuronal.
• Neuroectoderm secretes Bone Morphogenic Protein-4 (BMP-4), a signaling molecule that blocks the neuronal fate in neighboring neuroectodermal cells.
• Mesoderm secretes proteins - Chordin, Noggin, Follistatin - that block BMP-4 and neuroectodermal cells continue as neuronal progenitors.
• This inductive mechanism is conserved between vertebrates and invertebrates.
• These, and other similar, signaling mechanisms are used by the developing nervous system to control other events later in development.
• BMP-4 is a member of the Transforming Growth Factor-beta (TGF-β) family of signaling molecules.
September 15, 2010 Lecture V. Cell Birth & Death 6
What this Lecture is about
• Cell Death – Necrosis vs Apoptosis
• Promoting growth and survival – “trophism”
• Inhibition of the “death mechanism”
• Broader implications: neuroembryology; cancer
• Different critters - Same genes
• Molecular models
• Connection of Trophic Factors to cell death
September 15, 2010 Lecture V. Cell Birth & Death 7
from Greek“apo” meaning “separation”
&“ptosis” for “falling off”
Apoptosis
Kerr, J. F., et al.,(1972)
September 15, 2010 8Lecture V. Cell Birth & Death
Types of Cell Death
Apoptosis (Programmed)
• Cell-Autonomous• Stereotypic• Rapid• “Clean” (dead cells eaten)
Necrosis (Provoked)
• Not Self-Initiated• Not Stereotypic• Can Be Slow• “Messy” (injury can spread)
September 15, 2010 9Lecture V. Cell Birth & Death
Ellis, R. E., et al., (1991)
Removing a neuron’s targets, leads to its death
Deprived NormalHamburger, V. (1958,1977)
September 15, 2010 10Lecture V. Cell Birth & Death
Neuronal death is central for normal NS development
Hamburger, (1975);Landmesser & Pilar, (1974);
Cowan & Wenger, (1967)
September 15, 2010 11Lecture V. Cell Birth & Death
Neuron survival correlateswith target innervation
TargetInnervation
Neuronal Loss
Motor neuronsTarget
Muscles
Not all neuronsinnervate targets
September 15, 2010 12Lecture V. Cell Birth & Death
DevelopmentProgresses
Axon Outgrowth
Target innervation determines which neurons survive
More targets(more neurons)
Fewer targets(fewer neurons)
September 15, 2010 13Lecture V. Cell Birth & Death
DevelopmentProgresses
September 15, 2010 14Lecture V. Cell Birth & Death
Levi-Montalcini, R., & Hamburger, V. (1951)
Mouse tumor (sarcoma) transplanted next to developing chick spinal cord causes axon sprouting consistent with a diffusible
factor - a nerve growth factor
ViktorHamburger
RitaLevi-Montalcini
StanleyCohen
September 15, 2010 15Lecture V. Cell Birth & Death
Levi-Montalcini, et al. (1954);Cohen, S., et al. (1954)
A quantitative functional assay for Nerve Growth Factor (NGF) activity, using explanted cultures of sensory ganglia
Hollyday, M. (2001); Abbott, A. (2009).Cohen, S. (1987)
NGF is the founding member of a large gene familyof Neurotrophins (NTs), distantly related to insulin
NGF bindsas a dimer
to its receptor
September 15, 2010 16Lecture V. Cell Birth & Death
Wiesmann, C., et al. (1999)
NGF/Neurotrophins Signal through Trk (tyrosine kinase) Receptors
NGF/NT
Multiple SignalingPathways
Via kinases and scaffolding proteins
Apoptosispathway
(PLC/PKC kinase)
Intracellular Ca+2
release, modulation of ion channels
Gene Activation/Repression
(PIK3/AKT kinase)
(Ras/MAP kinase)
September 15, 2010 17Lecture V. Cell Birth & Death
Trk Receptors (TrkA, TrkB, TrkC, p75)
C. elegans is the model organism for molecular genetic studies
SydneyBrenner
JohnSulston
H. RobertHorvitz
Hypoderm
Bodywall Muscle
Cuticular CellsNeurons
PharynxIntestineVulva
Germ CellsGonad
Muscle
deve
lopm
enta
l tim
e
Neuronal Cell Death Lineages
September 15, 2010 18Lecture V. Cell Birth & Death
Brenner, S. (1973) ; Sulston, J. E., & Horvitz, H. R. (1977); Sulston, J. E., et al. (1983); White, J. G., et al. (1982)
Programmed Cell Death of single identifiedneurons can be followed in live worms
P11aap
September 15, 2010 19Lecture V. Cell Birth & Death
Sulston, J. E., & Horvitz, H. R. (1977)
2 Classes of C. elegans Cell Death Mutants
(pro-survival genes + pro-apoptosis genes)
(normal number of cells)
(pro-survival genes + pro-apoptosis genes)
(fewer cells)
(pro-survival genes + pro-apoptosis genes)
(extra cells)September 15, 2010 20Lecture V. Cell Birth & Death
WT
Mutant class I
Mutant class II
ced-3
ced-4 CellDeath
ced-9(pro-survival)
gene (pro-apoptosis)genes
Genetic analysis of cell death genes in C. elegans defines a genetic pathway
ced-9(lf) excessive cell death (fewer cells) animals dieas embryos
ced-3(lf) reduced cell death (extra cells) viableced-4(lf) reduced cell death (extra cells) viable
ced-9(lf) ced-3(lf) reduced cell death (extra cells) viableced-9(lf) ced-4(lf) reduced cell death (extra cells) viable
Ellis, R. E., et al., (1991); Ellis, R. E., & Horvitz, H. R. (1991)
September 15, 2010 21Lecture V. Cell Birth & Death
XX
XX
t(14;18) Chromosomal Translocation Causes Human B-Cell Leukemia by Overexpression of Bcl-2
Stanley Korsmeyer
Bcl-2
Chromosome 18Ig Heavy Chain
Chromosome 14
Bcl-2
Chromosome 18
Ig Heavy Chain
Chromosome 14
t(14;18) Chromosomal Translocation
Bcl-2
September 15, 2010 22Lecture V. Cell Birth & Death
Cleary, M. L., et al., (1986); Haldar, S., et al. (1990); Korsmeyer, S. J. (1992); Vaux, D. L., et al. (1988)
The “core” Cell Death genes found in C. elegans are conserved as multigene families in vertebrates
ced-9 / Bcl-2:Bcl-2: B-Cell Leukemia.• “Pro-survival” protein.• Inhibits release of cytochrome C from mitochondria (vertebrates).• Sequesters CED-4 from cytoplasm (worms).
ced-4 / Apaf:
Apaf: Apoptosis activity factor.• “Adaptor” or “scaffold” protein.• Aggregates inactive procaspase, causing auto-activation by proximity.• Requires cytochrome C, and ATP for multimerization (vertebrates).
ced-3 / Caspase: Caspase: Cysteineactive-site, aspartate cleavage-site, Protease.• “Terminator” protein.• Protease activity when activated by proteolysis.
September 15, 2010 23Lecture V. Cell Birth & Death
Yang, X., (1998)
Xue, D., & Horvitz, H. R. (1997)
Xue, D., et al. (1996);Yuan, J. Y., & Horvitz, H. R. (1990)
Molecular Model for Apoptosis
activatedcaspase
(cascade)
(BH3 domains)
Apaf aggregation
single BH3domain protein
(egl-1)
mitochondria
Bcl-2(ced-9)
Apaf(ced-4)
caspase(ced-3)
---
Death
InactiveProcaspase
recruited
(procaspase recruitment) ---
---
Cytochrome C
(*Catalysis of the removal of
auto-inhibitory caspase domain*)
September 15, 2010 24Lecture V. Cell Birth & Death
Gross, A., et al., (1999)
NGF is only one of multiple pathways to the “core” death mechanism, through many single-BH3 proteins
Single BH3domain protein
Single BH3domain protein
Single BH3domain protein
BCL-2
“Initiator”caspase-8
NGF
Initiation of apoptosis byextracellular ligands (FAS, TNF)
*
*
*
**
“Core” apoptotic components
September 15, 2010 25Lecture V. Cell Birth & Death
Apaf/Cytochrome C Aggregate intoa 7-Spoke Apoptosome Complex (“Wheel of Death”)
+procaspase-9 (x7?)
procaspase-9
Acehan, D., et al. (2002)
Apaf gene
Cytochrome CCARD(caspase activationand recruitment domain)
ApafWD-40
WD-40
Single-particleElectron Microscope
Analysis
September 15, 2010 26Lecture V. Cell Birth & Death
Pro-deathPro-survival
Single-BH3 domain molecules integrate multiple signals that trigger apoptosis.
Mitochondria integrate “Pro-survival” and “Pro-death”signals from a family of Bcl-2-like genes.
(BH3)(BH3)
“Pro-death” Single-BH3 domain proteins
complex with Bcl-2 to release cytochrome C
from mitochondria through “giant”
mitochondrial ionic channels.
pA
Diptheria Toxin(pore forming)
Bcl-xL(Bcl-2 like)
BH3
September 15, 2010 27Lecture V. Cell Birth & Death
Schlesinger, P. H., et al., (2002), Fesik, (2000)
Molecular Animation of Cell Death Mediated by the FAS pathway
Berry, D. (2006) http://www.wehi.edu.au/education/wehi-tv/?page=2.
September 15, 2010 28Lecture V. Cell Birth & Death
September 15, 2010 Lecture V. Cell Birth & Death 29
What this Lecture was about
• Programmed cell death (apoptosis) is a physiological mechanism distinct from necrotic cell death.
• Apoptosis occurs widely during normal development of the nervous system.
• Isolation of specific molecules involved in promoting growth and survival – “trophism,” e.g., Nerve Growth Factor (NGF).
• What is the “death mechanism” that NGF (and other neruotrophins) inhibit?
• Broader implications: controlled cell death in neuroembryology vs uncontrolled cell growth of cancer.
• Gene homologies between organisms - humans and worms (nematodes)
• Molecular models for apoptosis
• How do trophic factors connect to this cell death pathway(s)?
September 15, 2010 Lecture V. Cell Birth & Death 30
September 15, 2010 Lecture V. Cell Birth & Death 31
September 15, 2010 32Lecture V. Cell Birth & Death
END
September 15, 2010 Lecture V. Cell Birth & Death 33