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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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HMC I nuoniftc is ngalrtie ot cnacre ssrponu.sipe MCH I yipsdsla eondgsyoulne etzsshdenyi etsopnir dan eserstpn ehmt ot DC+8 T .lscle heT ielaurf ot laipsdy HCM I, or MCH I lyipads of eslnofn- a(dn by ieonnetxs eu)cnrasco oinsetrp eigtrrgs a cralellu miemnu rn,speseo ildegan to snctoridtue of het lecl.

The tooepamrse is ueds rof eht ntoaadgider fo worn ou,t ne,steensc or mmfrealdo .eorsptni sA reaccn ovedpse,l remo mtiutsano dael to iasdercen grown s.nrpetoi ynOl yb esoprnexis fo the eoarteposm, ro sti ve-niesrseoorp,x nca tshee tnautm onpitser eb eagdderd astf hegoun to tno eb eiylsdpda by MHC I dan ldea to eth ecll bgnei ldki.le teBobrziom bclkso teh era,msoepot so the anmtut irposent aer plddseiay no hte saeuf,rc owainllg eht emnmui yetssm ot gcnerezio dan lkli pgicloaaloth e.lcls

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catch-22  nrhtoeA way ot opaphcar ti is ot kthin tabou MCH lcass I ecosngspi.r Bsy,clliaa if uyo nthiibi eht rso,peaotme eidsptep will tno be eedgernta and gnoniht is iblaavlea ot be ledoad noto CMH I mme(rereb MHC I sah ot be oledad ereobf sit' easrpntotdr to teh lcel r.sae)fuc llesC htta d'tno seerxps CHM I tge illkde by teh taarlnu srei.lkl sp4/7lm3itmnP:wn//./.C.pw/h2hM1nc/i.tcl2sg6awcbetoirv +32
kai  n"I usnoiolnc,c we avhe dsraotdnemte thta eth osroteaepm ibhrtoini bizotrebom stnwedaguro-le salcs I adn nnceesah eth vseisttiniy of ymoelma ot KN dlm–tidlaceee ls"siy rofm teh nsuccoloni fo het NHI eprap +6
maddy1994  eanhotr chmaenims is by nocibgkl trmooeeosp u vene reseacde gidtroane fo iaptrppocoto trospi...osen it enccehsan ropsofotpmis(a du)lowr +6
azibird  uBt D+8C and KN esllc klil aiv irofpne!r Why is ihts nesawr nor?wg sI ti ceesuba sti' nto eth iaryrmp cf?eetf +2
testready  Th"e soaerpeomt si teh aojrm ocrsue fo leycptrotio aicitvty nveivdlo in hte einanoetgr fo pseidpte ofr oeittanspner yb jmrao pyitiiostocamlibth eplcxmo sclsa I suellce.mo We proret eth new iobsnvoeatr atht ozitebmrbo adweeulrsgn-ot AHL alcss I on MM elsl,c stgnueilr in seaecdnri KN ai–cetldeemdl iy.ss"ls//ctwpvmi:g.sti/Pmt.cwnr2.cnC1l6M4/n/h2/pa3wel7.bhio +
fatboyslim  I nhkit awht OP dasi rdnocttasic wthi ahwt 22c-@ctha cdiet in hte PdMeub lartec.i +
an1  PO said ly"nO by eipsesrnox fo eth tre,esoamop or its eevino-espsorxr, acn shtee tunamt osentpir be dagddere ftsa geuohn to ton be dledypsai by HCM ".I UW IQD 71416 asys tath a peontir gsrdounee naedrtgdoia by teh nubiiituq rpmosaotee hwt,ypaa frate hhwci it esgo to hte RE nad ethn si desnretep to teh elcl cfeursa ofr HCM 1 sprnseoe edingla to iopspotsa iva rsormefp adn zysnag.rem anigvH a eraeomsotp orinibhit olwud aylcluat vnprtee het CHM sneesrop eaecbus no oirepsnt aer .eysipaddl lsoA noet ttha the ntsuieqo ssay iwhch cpssroe lilw eb dtf,aceef three si on emtinno of sreiacne ro eerscd.ae So s,ey het MHC /1 DC8 ayathwsp si ,eftedcfa ubt sit' talauycl wnod argtelud.e nA nseacbe of MHC 1 sedla ot NK lelc mitddeea d.htae +

"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/



 +5  upvote downvote
submitted by tinydoc(276)
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/U/tuRzfhIJhtt3s.mpeu/byo5:H

OAM of moooeetprs ronbthiisi fro .MM L:RTD si that tyeh lybcasali bokcl hte oesorptmeo mfro nncitonfgiu os thta mymlaeo celsl 'nact cryecel sopteirn hyt(e meka a ont fo )tmhe nda wenh thye nt'ac eb ycecdlre yeht iubld pu and tthas oitxc ot het llec nad ti de.is

oenbdy htat the iqsnuote si isyllabac angkis if hte tinbnoiiih of pretoossemo stin cifpseic ot hte oeyMaml llcse dan ti intihbied toehr sc'lle etemsorposo wtha lduwo be cfeeftde?

MHC cssal I si spenert on all neledtauc elcsl lal( sclle ni eht obdy tecxpe CB)R adn cnotiufn ot trsneep gsnoednueo ntgesnia ot DC8+ t eclsl to be dyrtdesoe fro( lemapxe rVial DAN ni an eefndcit clle.) heT ayw ythe od isht is yb atgkin eht reiptno ti endse to snetper nda iankgerb it dnwo tion much rlsaeml itpeedp nischa so( it anc itf no eht C.HIM If thsi spte wsa intdbiehi ni hreot csell tneh teh the eatronsenPit fo MHC I tdwlonu eb able ot netpesr rithe eiagnnst ot D8+C T elslc and utlaNar lreikl llecs. as eth iestuqon ielpism.

eTh uqtonsie swa rupse crtyik abueces fi uyo odnt' nwko how ompteseoor rnihiotsbi orwk enht oyu ttsra goinolk fro an asnwre hatt uwdol xipalne hwo yteh wudlo klli outrm llces sa .wlel I tog ti rwogn o.ot It deiruerq kdgwnoeel of hte wya MHC I resnpste ptedpsi.e

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 +4  upvote downvote
submitted by krewfoo99(115)
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hWy dlowu osiernpfr eb teh orwgn wnsa?er nuWdotl aolctaciumun fo oxtic isoretpn suace hte ecll ot eroudng spspotioa ?

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ergogenic22  obioztermB sdeo nto cetrdily vaacttie rfnpreo.i tI detircly ibnishit hte ptmoaoeers hichw → esnalbe D8+C T ellsc to eintitai oppaitsso → iva irfnopre lereesa (ni ceeness a rndwasmeot ).ceffet +4
drzed  Eya,tlcx ti sirggetr the ellsc to rnogdeu aispsoopt hcwih nsame tath it nac etrhei eb lelc eaddietm rf(preoin nda enmgazyr vai ASSAF/L)F RO ti odulc laso be uhrotgh hte rnsiciint ywptaah g(.e. rotdnm;oiilcah cyohmector )c +
powerhouseofthecell  nQueiso:t tuB woh od DC8 sllce evha a lore ni htis secospr xylceta ni the veteitn?g sI it nagisy that hewn teh esniropt buldi u,p noly ethn od CD8 llecs eocm and ntedsia fo CHM I gtienneprs ot pe,rtmaeosos they eetpnrs ti to 8DC ot eiiniatt tsooap?ips +
flexatronn  @hetepolcfehlworouse so ti lla gsoe bcka ot saibc unmoim i( ogt sith rwogn dna ptu asotipsop sa el)lw utb etfar wnivigree nreteval aink ,scrda i onw egt Stio . metooesrpas kerba odnw tdggea posnirte tnwhii the llec (e)n.sdguonoe Teh weraknobd opcudtrs get ntake pu yb ptnartosr istoedsaac whti gtnniea sescgnpori AP(T) nda ghrtbou to teh ruhgo .RE hTe bonrwedka tcodrpus aer nhte aodedl oton CHM I lcselemuo adn rhbtgou to hte racfesu of eht ell.c When ninihgkt botau HCM I, hntik aotub C8+D T lscle AF( MHC 1 x 8 = DwN oC8. ot ui,emsarmz hewn guisn a toeasmpero i,hbiriont yuore' cnblkigo atht iagtgng dna CMH I ldnaiog .oprsecs sA etsadt eo,freb DC8 recsezingo MCH I hh(icw tnow' nppaeh wenh sguni sheet dgsr)u +3
whosdaprincesss  nalf@txoren taknh yuo !!!! +



 +0  upvote downvote
submitted by abhishek021196(119)
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bBe,orzmtio fzmbocairli

Mnimhasec = rsPeoeoatm osbitiinh,r deicnu srrate at G2M- epash dan .ptssaopoi

seU = pelilMut lo,emmay amlten lelc aomyhlp.m

vAd ceffEst = iePlpaerrh htrpya,euon rspeeh etorsz cravintiteoa

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tyrionwill  nreud roimobt,zeB the msoreeaotp cnnaot gdiset rilva Ag nad serpsnet ti ot teh barbmddeon-enme .-CHMI Treerfoeh TC8D-c toncan zoneigcre eht hsot lelsc ingtocnnia lesrepda V.ZV tahT si orylbapb ywh hlgseisn si neo fo eht arulopp idse fcetfe of btre.mzoiBo +
kcyanide101  ehT urgd biihsint .pesmtoeoor eneHc reeht si no matfreng aleavialb tohurhg TPA edisin D4C llce ot aldo tuon HMC ....I sA hcsu teh CD8 eneairopsntt to elTlc is ee.eprvdtn eTh nlgatucuicma oirpnste dinesi het D8C clesl hcwhi era otn gbine oernkb wdno yb eth motsoerpeo ceusa it ot rgnodue ppssoitoa +



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