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Retired NBME 23 Answers

nbme23/Block 1/Question#22 (reveal difficulty score)
An investigator is studying the adverse ...
Presentation of antigens to CD8+ T lymphocytes 🔍 / 📺 / 🌳 / 📖
tags: immuno repeat

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 +11  upvote downvote
submitted by sajaqua1(607)
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MHC I otnuinfc si etriglan ot eccnra soipepsnusr. MHC I apsdsliy yulogndoseen sdhetnzsyei sineropt dna enrptses temh ot +C8D T .lelcs hTe irlfaue ot aylidps CMH I, or MHC I salipyd fo losne-fn (dan by eoinsntex o)serncuca rinetosp gtrgresi a urallcle emmniu pse,snroe lnedgia to otsecudritn of eth l.ecl

heT sreoomaetp is euds fro eht ritdanoaged fo wonr t,uo sceteesnn, or rolmmadfe et.oprnsi sA ecarcn eld,vpose omre utanmoist dlea ot cendriase onwgr s.oinpter ylnO yb enprsosixe fo eth otmpees,aor ro sti pexos-s,ornervie cna sethe tntmau eroitnps eb aedddreg fast noehgu to not be sedidpyal yb MHC I and adle to eth ellc iebgn ikedll. biroteBozm sklcob eth pms,eteorao so teh ttanum spnetrio rae aedslypid on eth cseurf,a oiwlalng the einmmu sesmty ot enoeczgir dan llki aocogaplihtl slecl.

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catch-22  ronhetA ayw ot opaapchr it is to iknth botau HCM scsal I ro.pscgiesn ialslc,aBy if yuo inihbit het p,raeooestm tippeesd lliw otn eb egeeatdrn nda nhntoig si leblaaaiv ot eb oddael ootn HCM I errbmeem( HCM I sha ot be dodlae roeefb si't drntsapeort ot eth clel ecf)sr.ua elsCl hatt dn'to pesresx CHM I gte llidek by het traauln .ekrllsi wiwhtcCtn.obh/m/7scv.24in.pg3ml/ewa/pM/P1ic/:rnt26s.l +32
kai  "In ,scclioonnu we hvae nmdtaseteord thta teh pomsrtaeeo ihbtinori embboztior uwldeane-tgors scasl I nad ceansenh eth yitsevnstii fo amlemyo ot NK –didamtceeell s"ilys rfom eht lsoncicuno fo the IHN aperp +6
maddy1994  thernao cseinhamm si yb bkonigcl oersetopom u vnee ederasec atondierg fo pacpoootirtp r.s.ip.esntoo it haneccsne po(trospasifmo u)odrlw +6
azibird  But CD+8 nad KN sclel llik vai nfpoi!rre Why si tihs erswna gwr?no Is ti becaues sti' tno hte rayirmp fc?etef +2
testready  "eTh eertaompos is het jarom seuorc fo eoipcttolyr iaiyvctt eilnvodv in the renntoeiag fo edpiespt orf nrtnopeastie by majro syibopcothiimlaitt locxpem cssla I omelclse.u eW roeprt the wen toivnearsob htta rebtmizboo unadolwerst-eg AHL slsac I no MM lsl,ec etnrsulig ni esdacerni KN tedlliamdece– yl."sismcw/vstl/wtbi2isnM2nh31c.C6/mi/e4cltpnhprog/.7.wP:./a +
fatboyslim  I htnik wtah PO dasi cosatdicrnt ihtw waht -tc2a@2ch iectd in hte euMbPd raiectl. +
an1  OP isda "Olny yb xespsnoeri of hte storoepeam, or ist e,pesis-vxnerroo cna ehtse mauntt seiontrp eb radeeddg fats ogeunh to not eb eidpslyad by CMH I." WU QID 67141 yass atth a tiorenp regndosue denoaigradt by the iitnibuuq msrteaopeo ahpty,wa trafe hwchi it sgeo to the ER and tenh si erpsedten ot het lelc securfa for MHC 1 nsseerop egalind to isapopsto vai rsmfrope nda mgzsrany.e avingH a petmooersa nbihriito wodlu auclalyt eprenvt eht HMC seoneprs auebsce on eprsntio era dsap.iydel oslA nteo thta eth tuseionq ysas hchiw sscerop iwll be ftfcadee, rehet is no inneomt fo aeiecsrn ro ee.ardces oS ,esy the CHM 1/ D8C aytwshap si ffdaee,ct btu i'ts llucatay wond rlgtdueea. nA eacnesb fo MHC 1 selda to NK lcle tmedeaid .dathe +

"Studies have shown that proteasome inhibitors block the assembly of MHC class I molecules and this is almost certainly because they are stopping the production of presented peptides that are needed for this process (6)." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3094101/


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 +5  upvote downvote
submitted by tinydoc(276)
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sUpztRH.5m//:JuoIe3ftbyhth/u

AMO fo repestoomo hibrnsitoi orf MM. RLDT: is atht hety cbiaallys kbolc teh oerpoetsom rfom iuifcnnnotg so hatt yelammo lcels ant'c clyecre ostpeirn hte(y akem a ton of mhte) and nwhe hyet cnt'a be creyedlc tehy iubld up adn tasht cotxi to teh elcl and ti des.i

eodnyb hatt teh usoiqten si sicylaalb agskni if het ibinoithni fo poooemstrse nist fseciicp ot hte lMomaey sllce nda it intidehib hetor cesll' ooeeorsmspt atwh udwlo be eectdffe?

MCH slacs I is pnseert no lal anulcedet lecls (all clsle in eth obdy ectepx BCR) and unofnict ot srnetep oogensnude iantseng ot D+C8 t sclle ot be dtdseyero fr(o maeplex lVira AND ni an itfeecdn )lc.el Teh ywa tyhe do tshi is yb taikgn teh irnteop ti dnees ot epnerst dna nrbekagi it ndwo toni cmuh lmlears pteipde hscnai s(o it can fit no the IH.CM If tish ptse asw ihdibtein in roeth sllec enht eth eth eiaeotnPnsrt of CMH I uwoltnd eb eabl to eeprnts retih nsaengit ot 8D+C T clsel dan taNalru ekllir clesl. as eht souqetin mepliis.

The nusotiqe saw pruse tykrci uasbcee fi ouy ndto' ownk woh toosempeor isnbirhtio work nhet ouy sartt gionlko fro an rweasn taht uwodl alinexp hwo yeht luowd likl mortu slcle sa lwle. I tgo ti gronw ot.o tI eqdurrei eodwlngke fo eht awy CHM I serspnet ete.dpspi

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 +4  upvote downvote
submitted by krewfoo99(115)
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yhW lwduo iperfrnso be eht rgwno swe?nra dtWnuol niutacmaolcu of cxiot itrnopse eusac eth lelc ot godrune pitpaooss ?

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ergogenic22  iomeroztbB dsoe ont crteylid ttveacai errfoi.np tI tieyrdcl iisbhnti the omaotsepre chiwh → asenelb C+D8 T llces ot anteitii aptoospsi → aiv enfporri slaeree (ni ecnsese a eowtdsmnar f)f.etec +4
drzed  tcx,laEy ti sgtiregr teh elscl ot drnegou tipoaossp whcih naems atth ti cna reheit be lcel mitededa prirnf(eo nad rgmazney iva /AFLS)AFS RO ti odcul sloa eb guhtroh hte nsiicitrn taahpyw ge.(. dnc;orailothim mthrceyoco c) +
powerhouseofthecell  oi:Qnsuet But ohw od 8DC llesc ehav a elro ni htsi sorecps ealtcyx ni hte ?etgtveni Is ti nsaygi ttah wneh teh tosenrip budli ,pu nlyo nhte od 8CD clles coem adn iedastn of HCM I srtegienpn to trosoemspea, ehyt pensetr ti to CD8 ot tinaitei astoip?osp +
flexatronn  uolwch@eoetpfsreohle so it all sgeo abkc to icbas ominum (i got siht nowrg and utp tsaopiosp as )ewll utb afrte ievwiegnr eatrnvel niak s,dacr i won teg .ito S tmsorpoaees kbrea odwn edtgga ptinsore nwihit hte elcl s)e(oenuo.gnd Teh adownekrb udstrpoc tge kaetn up by prnorttsa astosicdea whti atnigen ingsopsrce (TAP) nda throgbu ot eth ruohg R.E Teh eaondwbrk crsupotd aer tehn ldaeod oont HMC I sclueemol adn hgtuobr ot eht fsrecau fo the .clle Whne hnikigtn uotab HMC ,I hitkn autob 8C+D T leslc FA( CHM 1 x 8 = .8 NoDCw to azmmir,esu ehwn ginsu a omreoesatp rb,oiiinth yuro'e ngbiokcl htat tgngaig dan HMC I oindlga cope.rss As tdtaes rbeefo, D8C nciezegosr CHM I i(cwhh ownt' nhppea wnhe iungs etesh u)rsdg +3
whosdaprincesss  elnoa@ntfrx khatn ouy !!!! +


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 +0  upvote downvote
submitted by abhishek021196(119)
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mBtizoorb,e lczibroamif

mMeashcin = tsooPareem bioshntii,r encidu ertars at M-G2 ehpsa nad saoi.ppsot

eUs = llepuiMt malyo,em amtnle elcl am.lmphoy

Avd ctfesfE = hpiaeerrPl h,rneaoptyu erphes eotrzs aeacvtinrtio

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tyrionwill  ndure Bez,mtboior eht mrseooptea taonnc itedsg rival gA and srnspete ti ot teh oeearbnmd-mbnde -ICM.H oefrerThe D8Tc-C toacnn eozricegn eth hsot lsecl nicingtnoa aesdlepr Z.VV htTa si bpalyrbo why enilghss is eno of het proaplu eids cftefe of Bt.orebmzoi +
kcyanide101  eTh gdru biinhsit somp.toroee Hence hrtee is on trafngme iabaevall guhhtro TAP einsdi 4DC lecl ot oadl unot CHM ....I As hucs eth DC8 ientnptraeos ot elTcl is etnvre.ped heT acigumtlanuc ptsoienr idisen the CD8 llesc ihhwc rae otn nibeg nekrob down yb the petooesrom uaesc it ot odnruge pssoitpao +


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