improving the human condition - amazon s3 · are the results of sleeping? what we know about sleep...
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ImprovingtheHumanCondition
DavidZhu,CarmenNg,CamilleMcAvoy,PedroFigueroa
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Itwouldmakethe“choosetwo:{sleep,grades,friends}”dilemmasomuchsimpler…
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Importance Sleepaffectseveryone! Seriousproblems/effectsofsleepdeprivation
Decreasedmentalfunction(memory,recognition,etc.) Cardiovascularproblems,weightgain
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Impact Startwithspecificapplications:large“delta”forsmallpopulation Military,Collegestudents,etc.
Expandtobroadapplications:smaller“delta”forlargepopulation Generalproductivitybooster?
Short‐andlong‐termhealthrisks?
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Knowns/Unknowns Muchisstillunknownaboutsleep
Whydowesleepatall? Whataretheresultsofsleeping?
Whatweknowaboutsleep 4Stages:N1,N2,N3,REM Occursincycleslasting90‐110mins.
N3,REMare“deepsleep”cycles REMonlyaccountsfor~30%ofsleep
Possibleto“isolate”REMsleep?
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Competition Manyresearchinstitutionsareinvestigatingthecauses/effectsofsleep
Drugstimulants Caffeine! Modafinil
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OurIdea “Curing”sleepmightbetooambitious,givenhowlittleisknownaboutthecausesofsleep
Increasetheleveloftoleranceforcaffeinebymanipulatingtheadenosinereceptors
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Althoughsleepisnotfullyunderstood,themanipulationofneuralreceptorscouldplayanimportantroleinincreasingtolerancetosleepdeprivation
Anotherimportantmethodforimprovingthefunctioningofthebrain,andparticularlyforhealingthedamagedbrain,isthroughtheregenerationofneurons
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Braindamage?Noproblem!
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Importance Thereisnowaytorepairdamagedneurons Seriousproblems!
Lossofmotorfunctions Braindisorders Deadneurons
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Impact Affectsonlyalimitedsegmentofthepopulation(injury,Alzheimer’s,etc.)–butimpactwouldbetremendous.
Wouldallowthosewhosufferfrombraindamagetohavereturnedphysicalandmentalfunctioning
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CompetingTechnologies Useofstemcellstoreplacedamagedneurons Stimulationofnervecellstohelpregrowneuralconnectionsinthebrain
Turningofforblockingpathwaysthatinhibitregrowthofneurons ThreeinhibitorsofaxonregrowthknowntodateareNogo,myelin‐associatedglycoprotein(MAG)andmyelin‐oligodendrocyteglycoprotein(OMgp)
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Knowns Basicstructureofneurons Neuralpathwaysandtheuseofneurotransmitterstocommunicatewithinthebrain
Neuronscanberegeneratedwiththeuseofstemcells
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Unknowns Efficienttechniquesforreplacingdamagedneurons
Natureofgenesassociatedwiththeregenerationofneurons
•Neuronswithintheadultbrainthatregrowaxialprojectionshavebeenfound,butthegenesthatencodeforthisgrowthandtheproteinsthattheytranslatearenotwellknown
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Insertingregeneratedneuronsintothebrainorstimulatingtheregenerationofneuronswithinthebraincouldallowfortherecoveryofmentalandphysicalfunctioning
•Neuronregenerationcouldhelptocurepatientswhosufferfromneurodegenerativediseases,suchasAlzheimer’s
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Importance
Highlydegenerativediseasethatisultimatelyfatal Lowersthequalityoflifeanddecreasesthecapacitytofunctionofsocietyofthosewhosufferfromit
Anestimated26.6millionpeople65yearsandolderhadAlzheimer’sworldwidein2006
ThusAlzheimer’shasterribleandirreversibledegenerativeeffectsonalargenumberofpeople
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Impact Memorymakesyouwhoyouare! WillhelppeoplewithAlzheimer’sandotherformsofdementiaretaintheirlifelongexperiences
Preservesfamilyunity ReducesHumanSuffering
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Howtostoptheloss? Rearrangethefiberstotheiroriginalposition KILLtheplaques Weareproposingtomonitorthemusing“bio‐markers”
Blood‐BrainBarrier LimitedImagingoftheBrain
IssuesforTreatment
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Knowns SenileplaquesandneurofibrillarytanglesaredirectlyassociatedwithAlzheimer’s
PossibleGeneticComponent:MutationsonChromosomes9and19
Thecellsultimatelydie Causesthebraintoshrink Proteinpiecesclumptogetherinthebrain Chemically“sticky”(theybondeasily) Theclumpsblocksignalsandultimatelykillthecells!!
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Unknowns Whatcausesplaquestoform Whattypesofneuronsareaffected
Whyarecertainareasofthebrainaffected
Structureoftheproteinplaques Timethatittakestheclumpstobe“big”enoughtoblocktheneuro‐signals
“Twisted”Proteins:Whatcausesthemtoentangle?
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CompetingTechnologies ManypharmaceuticaltreatmentsfocusonneurotransmittersNOTonplaquesandtangles
ClinicalTrials TheU.S.FoodandDrugAdministrationhasapprovedfourdrugstotreatAD.ForpeoplewithmildormoderateAD,donepezil(Aricept®),rivastigmine(Exelon®),orgalantamine(Razadyne®).
Namendaregulatesglutamatewhichplaysakeyroleinprocessinginformation.
TreatmentsResearched:Breakingdownbeta‐amyloidplaques,anti‐inflammatorydrugs
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Summary Manipulatingreceptorsonneuronscanplayamajorroleinthetransferof
informationthroughneuralpathways Changingadenosinereceptorscanhelpincreasetolerancetocaffeine
Caffeinesupplementscouldbemorecontinuouslyeffectiveindecreasingtheneedforsleep
Changingneuralreceptorscanalsoallowforspecificdrugtreatmentsandchemicalstobetransferredtoneuronsformedicinalpurposes
Regenerationofneuronsisamajorconcernsincemostneuronsareinastateofnon‐replication
TheregenerationofneuronscouldallowforthetreatmentofpatientswithAlzheimer’sandotherformsofdementia
TheremovalofplaquesandthedetanglingofneurofiberscouldimproveneuralfunctioningandultimatelyhelptopreventtheprogressionofAlzheimer’s
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Resources http://www.pnas.org/content/100/13/7430.full http://www.alseres.com/science‐technology/nerve‐repair.asp http://www.narcis.info/research/RecordID/OND1325851/Language/en/;jsessio
nid=i0hc281m2bl http://alzheimersdiseaseaid.com/origins‐unknown‐‐the‐battle‐with‐
alzheimer‐s‐continues.php http://www.nia.nih.gov/Alzheimers/AlzheimersInformation/Treatment/http:/
/alzheimers.about.com/od/treatmentofalzheimers/a/treatments.htm http://web.mit.edu/newsoffice/2008/alzheimers‐protein‐
0821.htmlhttp://www.nanowerk.com/spotlight/spotid=5262.php