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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">LV</journal-id>
<journal-id journal-id-type="nlm-ta">Lijec Vjesn</journal-id>
<journal-title-group>
<journal-title>Lijecnicki Vjesnik</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Lijec. Vjesn.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="ppub">0024-3477</issn>
<issn pub-type="epub">1849-2177</issn>
<publisher><publisher-name>Croatian Medical Association</publisher-name></publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">LV-148-45</article-id>
<article-id pub-id-type="doi">10.26800/LV-148-1-2-7</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original article</subject></subj-group>
</article-categories>
<title-group>
<article-title>Oksidacijski stres i lipidna peroksidacija &#x2013; od molekularnih mehanizama do klinike</article-title>
<trans-title-group xml:lang="en">
<trans-title>Oxidative stress and lipid peroxidation &#x2013; from molecular mechanisms to clinic</trans-title>
</trans-title-group>
</title-group>
<contrib-group>
<contrib contrib-type="author"><name><surname>Borovi&#x0107; &#x0160;unji&#x0107;</surname><given-names>Suzana</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Jaganjac</surname><given-names>Morana</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Stojanovi&#x0107; Markovi&#x0107;</surname><given-names>Anita</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Halasz</surname><given-names>Mirna</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Vlaini&#x0107;</surname><given-names>Josipa</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Jure&#x0161;i&#x0107;</surname><given-names>Petra</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Maru&#x0161;i&#x0107;</surname><given-names>Zlatko</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>&#x017D;arkovi&#x0107;</surname><given-names>Kamelija</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5032-0369</contrib-id><name><surname>&#x017D;arkovi&#x0107;</surname><given-names>Neven</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib>
<aff id="aff1"><label>1</label><institution content-type="dept">Laboratorij za oksidacijski stres, Zavod za molekularnu medicinu</institution>, <institution>Institut Ru&#x0111;er Bo&#x0161;kovi&#x0107;</institution>, <addr-line>Zagreb</addr-line></aff>
<aff id="aff2"><label>2</label>Klini&#x010D;ki bolni&#x010D;ki centar Zagreb, Zavod za patologiju Medicinskog fakulteta Sveu&#x010D;ili&#x0161;ta u Zagrebu</aff>
</contrib-group>
<author-notes>
<corresp id="cor1">Adresa za dopisivanje: Prof. dr. sc. Neven &#x017D;arkovi&#x0107;, dr. med., <ext-link ext-link-type="uri" xlink:href="https://orcid.org/0000-0001-5032-0369">https://orcid.org/0000-0001-5032-0369</ext-link>, Laboratorij za oksidacijski stres, Zavod za molekularnu medicinu, Institut Ru&#x0111;er Bo&#x0161;kovi&#x0107;, Bijeni&#x010D;ka 54, 10000 Zagreb, e-po&#x0161;ta: <email xlink:href="nz.2024@outlook.com">nz.2024@outlook.com</email></corresp>
<fn fn-type="con">
<p content-type="fn-title">DOPRINOS AUTORA</p>
<p>K<sc>oncepcija</sc> <sc>ili</sc> <sc>nacrt</sc> <sc>rada</sc>: N&#x017D;</p>
<p>P<sc>rikupljanje</sc>, <sc>analiza</sc> <sc>i</sc> <sc>interpretacija</sc> <sc>podataka</sc>: SB&#x0160;, MJ, ASM, MH, JV, PJ, ZM, K&#x017D;, N&#x017D;</p>
<p>P<sc>isanje</sc> <sc>prve</sc> <sc>verzije</sc> <sc>rada</sc>: ASM, MH, MJ, SB&#x0160;, JV, PJ, ZM, K&#x017D;, N&#x017D;</p>
<p>K<sc>riti&#x010D;ka</sc> <sc>revizija</sc>: SB&#x0160;, MJ, K&#x017D;, N&#x017D;</p>
</fn>
</author-notes>
<pub-date date-type="pub" publication-format="electronic"><month>03</month><year>2026</year></pub-date>
<pub-date date-type="pub" publication-format="print"><month>03</month><year>2026</year></pub-date>
<volume>148</volume>
<issue>1-2</issue>
<fpage>45</fpage>
<lpage>52</lpage>
<permissions>
<copyright-statement>Croatian Medical Association</copyright-statement>
<copyright-year>2026</copyright-year>
<copyright-holder>Croatian Medical Association</copyright-holder>
<license xlink:href="https://creativecommons.org/licenses/by-nc-nd/4.0/" specific-use="CC BY-NC-ND 4.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (CC BY-NC-ND) 4.0 License.</license-p></license>
</permissions>
<abstract>
<title>SA&#x017D;ETAK</title>
<p>Pojam oksidacijski stres podrazumijeva procese stvaranja suvi&#x0161;ka reaktivnih kisikovih tvari (ROS) u odnosu na mogu&#x0107;nosti nadzora ROS-a od strane stanica i organizma putem antioksidansa. Posljedi&#x010D;no ROS vi&#x0161;e ne obna&#x0161;aju fiziolo&#x0161;ke uloge u regulaciji metabolizma i prijenosa stani&#x010D;nih signala potrebnih za rast i razvoj stanica, ve&#x0107; postaju &#x0161;tetne tvari koje napadaju lipide, proteine i nukleinske kiseline. Oksidacijski stres prati organizam tijekom cijelog &#x017E;ivota, te mo&#x017E;e izazvati reverzibilna o&#x0161;te&#x0107;enja koja u kona&#x010D;nici pogoduju ja&#x010D;anju obrambenih snaga organizma mehanizmom hormeze. Me&#x0111;utim, dugotrajan i agresivan oksidacijski stres pogoduje nastanku niza razli&#x010D;itih bolesti vezanih uz starenje i stres, pa tako i neurodegenerativnih bolesti i zlo&#x0107;udnih tumora. Bitna sastavnica oksidacijskog stresa jest lipidna peroksidacija, koja poput oksidacijskog stresa mo&#x017E;e imati i po&#x017E;eljne i vrlo &#x0161;tetne u&#x010D;inke. To je uvelike zbog kona&#x010D;nih produkata oksidacije vi&#x0161;estruko nezasi&#x0107;enih masnih kiselina, od kojih je posebno va&#x017E;an 4-hidroksinonenal (HNE) koji djeluje kao drugi glasnik ROS-a jer posti&#x017E;e sli&#x010D;ne u&#x010D;inke kao ROS, &#x010D;ak i kad prestane oksidacijski stres, te se mogu odrediti u tkivima i tjelesnim teku&#x0107;inama. Zbog toga su istra&#x017E;ivanja oksidacijskog stresa i lipidne peroksidacije va&#x017E;na radi boljeg razumijevanja bolesti vezanih uz starenje i stres, radi razvoja dijagnosti&#x010D;kih postupaka, kao i mogu&#x0107;nosti njihove primjene u integrativnoj medicini.</p>
</abstract>
<trans-abstract xml:lang="en">
<title>SUMMARY</title>
<p>The term oxidative stress refers to the processes that create an excess of reactive oxygen species (ROS) in relation to the ability of cells and the body to control ROS with antioxidants. Consequently, ROS no longer play a physiological role in regulating metabolism and cell signaling necessary for the growth and development of cells, but instead become harmful substances that attack lipids, proteins, and nucleic acids. Oxidative stress accompanies the body throughout life and can cause reversible damage that ultimately favors the strengthening of the body&#x2019;s defenses by the hormesis mechanism. However, long-term and aggressive oxidative stress favors the development of many different diseases associated with aging and stress, including neurodegenerative diseases and malignant tumors. An important component of oxidative stress is lipid peroxidation, which, like oxidative stress, can have both desirable and very harmful effects. This is largely due to the formation of reactive aldehydes, as the final products of the oxidation of polyunsaturated fatty acids, of which 4-hydroxynonenal (HNE) is particularly important, acting as a second messenger of ROS because it achieves similar effects as ROS, even when oxidative stress ceases, and can be measured in tissues and body fluids. Therefore, research on oxidative stress and lipid peroxidation is important for a better understanding of diseases related to aging and stress, for the development of diagnostic procedures, and the possibilities of their application in integrative cancer therapies.</p>
</trans-abstract>
<kwd-group kwd-group-type="author"><kwd>Deskriptori OKSIDACIJSKI STRES &#x2013; fiziologija</kwd><kwd>LIPIDNA PEROKSIDACIJA &#x2013; fiziologija</kwd><kwd>REAKTIVNE KISIKOVE TVARI &#x2013; metabolizam</kwd><kwd>ALDEHIDI &#x2013; metabolizam</kwd><kwd>ANTIOKSIDANSI</kwd><kwd>REPERFUZIJSKA OZLJEDA &#x2013; metabolizam, patologija</kwd><kwd>HORMEZA</kwd><kwd>ATEROSKLEROZA &#x2013; metabolizam</kwd><kwd>NEURODEGENERATIVNE BOLESTI &#x2013; metabolizam</kwd><kwd>ALZHEIMEROVA BOLEST</kwd><kwd>AMILOID BETA PEPTIDI</kwd><kwd>UPALA &#x2013; metabolizam</kwd><kwd>KARCINOGENEZA &#x2013; metabolizam</kwd><kwd>BIOMARKERI</kwd></kwd-group>
<kwd-group kwd-group-type="translator" xml:lang="en"><title>Descriptors </title><kwd>OXIDATIVE STRESS &#x2013; physiology</kwd><kwd>LIPID PEROXIDATION &#x2013; physiology</kwd><kwd>REACTIVE OXYGEN SPECIES &#x2013; metabolism</kwd><kwd>ALDEHYDES &#x2013; metabolism</kwd><kwd>ANTIOXIDANTS</kwd><kwd>REPERFUSION INJURY &#x2013; metabolism, pathology</kwd><kwd>HORMESIS</kwd><kwd>ATHEROSCLEROSIS &#x2013; metabolism</kwd><kwd>NEURODEGENERATIVE DISEASES &#x2013; metabolism</kwd><kwd>ALZHEIMER DISEASE</kwd><kwd>AMYLOID BETA-PEPTIDES</kwd><kwd>I NFLAMMATION &#x2013; metabolism</kwd><kwd>CARCINOGENESIS &#x2013; metabolism</kwd><kwd>BIOMARKERS</kwd></kwd-group>
</article-meta>
</front>
<body>
<p>Oksidacijski stres danas se prepoznaje kao va&#x017E;an &#x010D;imbenik u nastanku i napredovanju brojnih bolesti s kojima se lije&#x010D;nici svakodnevno susre&#x0107;u &#x2013; od infarkta miokarda i mo&#x017E;danog udara, preko Alzheimerove bolesti, do zlo&#x0107;udnih tumora. Razumijevanje temeljnih mehanizama oksidacijskog stresa i lipidne peroksidacije stoga nije samo akademsko pitanje, ve&#x0107; ima izravne implikacije za dijagnostiku, pra&#x0107;enje i lije&#x010D;enje bolesnika. Tijekom aerobnog metabolizma iz kisika mogu nastati razli&#x010D;ite vrlo reaktivne kisikove tvari (engl. <italic>reactive oxygen species</italic> &#x2013; ROS). Iako se na ROS u po&#x010D;etku gledalo isklju&#x010D;ivo kao na &#x0161;tetne nusprodukte metabolizma, danas je poznata njihova klju&#x010D;na uloga u tzv. &#x201E;redoks signalnim putevima&#x201C; te spoznaja da su ove tvari potrebne za normalnu funkciju stanica. Stoga su ROS bitne za odr&#x017E;avanje normalnih fiziolo&#x0161;kih procesa u organizmu, sudjeluju u regulaciji stani&#x010D;nog rasta, funkcija i smrti stanica, (<xref ref-type="bibr" rid="r1"><italic>1</italic></xref>, <xref ref-type="bibr" rid="r2"><italic>2</italic></xref>) te igraju fiziolo&#x0161;ku ulogu u regulaciji funkcije imunolo&#x0161;kog sustava. (<xref ref-type="bibr" rid="r3"><italic>3</italic></xref>) Kada je stvaranje i uklanjanje ROS-a u ravnote&#x017E;i, govorimo o redoks homeostazi, dok pomak ravnote&#x017E;e u korist pro-oksidansa dovodi do dinami&#x010D;kog procesa koji se naziva oksidacijski stres.</p>
<sec sec-type="other1">
<title>Oksidacijski stres i antioksidacijski mehanizmi za&#x0161;tite</title>
<p>Do oksidacijskog stresa mo&#x017E;e do&#x0107;i zbog prekomjerne proizvodnje ROS-a i/ili oslabljenog antioksidacijskog odgovora. Manji poreme&#x0107;aji u ravnote&#x017E;i &#x010D;esto izazivaju homeostatske prilagodbe, &#x0161;tovi&#x0161;e sna&#x017E;e mogu&#x0107;nosti obrane od oksidacijskog stresa putem procesa prilagodbe &#x2013; hormeze, dok intenzivniji i kroni&#x010D;ni oblici oksidacijskog stresa mogu dovesti do nepovratnih o&#x0161;te&#x0107;enja stanica i njihove smrti. Oksidacijski stres igra klju&#x010D;nu ulogu u patofiziologiji ozljeda i upale te poreme&#x0107;aja vezanih uz stres i starenje. Posebno se isti&#x010D;e zna&#x010D;aj oksidacijskog stresa u bolestima kardiovaskularnog sustava te u autoimunim poreme&#x0107;ajima, ali i u degenerativnim procesima i zlo&#x0107;udnim tumorima. Oksidacijski stres doprinosi i o&#x0161;te&#x0107;enju vida i drugih osjetila te u metaboli&#x010D;kim poreme&#x0107;ajima, uklju&#x010D;uju&#x0107;i i metaboli&#x010D;ki sindrom. (<xref ref-type="bibr" rid="r4"><italic>4</italic></xref>, <xref ref-type="bibr" rid="r5"><italic>5</italic></xref>)</p>
<p>Kao &#x0161;to i sam naziv govori, ROS uklju&#x010D;uju spojeve koji sadr&#x017E;e kisik, a mogu biti slobodni radikali, kao &#x0161;to je hidroksilni radikal (OH<sup>&#x2022;</sup>) ili pak reaktivne molekule koje nisu radikali, kao &#x0161;to su vodikov peroksid (H<sub>2</sub>O<sub>2</sub>) i ozon (O<sub>3</sub>). Prisutnost upale u organizmu &#x010D;esto je izvor pove&#x0107;anoga endogenog stvaranja ROS-a, kao &#x0161;to je to i nepravilna prehrana, ali i svako stresno stanje, pa i poja&#x010D;ana tjelesna aktivnost. Oko 90% ROS-a u stanici nastaje u mitohondrijima, a potencijalnu opasnost za stanicu predstavlja nekontrolirano &#x201E;curenje&#x201C; 1 &#x2013; 2% ovako nastaloga superoksidnog aniona (O<sub>2</sub><sup>&#x2013;</sup>), pa se enzim superoksid dismutaza (SOD) O<sub>2</sub><sup>&#x2013;</sup> pretvara u H<sub>2</sub>O<sub>2</sub>. (<xref ref-type="bibr" rid="r6"><italic>6</italic></xref>&#x2013;<xref ref-type="bibr" rid="r9"><italic>9</italic></xref>) Premda nije slobodni radikal, jer nema nesparenih elektrona u omota&#x010D;u, H<sub>2</sub>O<sub>2</sub> je relativno stabilna ROS molekula koja mo&#x017E;e relativno lako prolaziti kroz stani&#x010D;ne membrane koje pri tome &#x010D;esto budu o&#x0161;te&#x0107;ene. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>) Iz H<sub>2</sub>O<sub>2</sub> u nazo&#x010D;nosti &#x017E;eljeza dolazi do stvaranja OH<sup>.</sup>, najreaktivnijeg i naj&#x0161;tetnijeg kisikovog radikala, &#x0161;to mogu sprije&#x010D;iti tvari koje stabiliziraju &#x017E;eljezo i enzim katalaza koja razgra&#x0111;uje H<sub>2</sub>O<sub>2</sub> u vodu i kisik. (<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>, <xref ref-type="bibr" rid="r12"><italic>12</italic></xref>)</p>
<p>U kona&#x010D;nici oksidacijski stres mo&#x017E;e o&#x0161;tetiti pojedine organe te dovodi do sustavnih poreme&#x0107;aja, &#x0161;oka pa i smrti cijelog organizma. Stoga se organizam od &#x0161;tetnih u&#x010D;inaka ROS-a brani putem antioksidacijskih mehanizama za&#x0161;tite koji se dijele na enzimatske i neenzimatske, a prema mjestu izvora na endogene i egzogene (<xref ref-type="fig" rid="f1">Figure 1</xref>). Endogene antioksidanse proizvodi sam organizam, dok se egzogeni unose putem prehrane, a oba sustava su bitna u neutralizaciji ROS-a.</p>
<fig id="f1" position="float" fig-type="figure"><label>Figure 1</label><caption><p>Exogenous and endogenous systems of antioxidant defense in humans</p></caption><graphic xlink:href="LV-148-45-f1"></graphic></fig>
<p>Unato&#x010D; va&#x017E;nim pozitivnim u&#x010D;incima antioksidansa, njihov pretjeran unos, osobito u obliku dodataka prehrani, mo&#x017E;e imati negativne posljedice za organizam. Zato se preporu&#x010D;uje unos antioksidansa primarno putem uravnote&#x017E;ene prehrane bogate vo&#x0107;em i povr&#x0107;em, bez umjetnih dodataka prehrani.</p>
</sec>
<sec sec-type="other2">
<title>Lipidna peroksidacija</title>
<p>Stani&#x010D;ni &#x201E;lipidom&#x201C; (sveukupni sastav lipida) vrlo je dinami&#x010D;an zbog stalnog utjecaja razli&#x010D;itih fiziolo&#x0161;kih i patolo&#x0161;kih &#x010D;imbenika. (<xref ref-type="bibr" rid="r13"><italic>13</italic></xref>) Vi&#x0161;estruko nezasi&#x0107;ene masne kiseline (PUFA, od engl. <italic>polyunsaturated fatty acids</italic>) koje su sastavni dio biolo&#x0161;kih membrana bitne su za funkcioniranje membrane i posebno osjetljive na visoke razine ROS-a. Lan&#x010D;ana reakcija lipidne peroksidacije odvija se u tri faze: inicijacija, propagacija i terminacija (<xref ref-type="fig" rid="f2">Figure 2</xref>). Pri tome treba imati na umu da &#x0107;e inicijacija lipidne peroksidacije nastati tek u slu&#x010D;aju nedostatka antioksidansa topivih u masti (prvenstveno vitamina E). S tim povezano, pojam terminacija podrazumijeva prekid procesa lipidne peroksidacije zbog djelovanja antioksidansa, a ako ne do&#x0111;e do terminacije/prekida lipidi &#x0107;e biti potpuno razgra&#x0111;eni, uglavnom u toksi&#x010D;ne produkte lipidne peroksidacije.</p>
<fig id="f2" position="float" fig-type="figure"><label>Figure 2</label><caption><p>The scheme of the lipid peroxidation chain reaction triggered by ROS</p></caption><graphic xlink:href="LV-148-45-f2"></graphic></fig>
<p>Vrsta kona&#x010D;nog produkta lipidne peroksidacije ovisit &#x0107;e o vrsti oksidirane PUFA-e. (<xref ref-type="bibr" rid="r14"><italic>14</italic></xref>) Me&#x0111;u kona&#x010D;nim produktima lipidne peroksidacije omega-6 su medicinski posebno va&#x017E;ni reaktivni aldehidi, poput malondialdehida (MDA), 4-hidroksinonenala (HNE ili 4-HNE) i akroleina. (<xref ref-type="bibr" rid="r15"><italic>15</italic></xref>&#x2013;<xref ref-type="bibr" rid="r18"><italic>18</italic></xref>) Reaktivni aldehidi u visokim koncentracijama o&#x0161;te&#x0107;uju stani&#x010D;ne proteine i DNA, poput ROS-a. Upravo zato antioksidansi, poput vitamina E, imaju vrlo zna&#x010D;ajnu ulogu u za&#x0161;titi stanice od o&#x0161;te&#x0107;enja uzrokovanih oksidacijskim stresom i lipidnom peroksidacijom. (<xref ref-type="bibr" rid="r19"><italic>19</italic></xref>) Reaktivni aldehidi su manje reaktivni od ROS-a, zato mogu putovati kroz membrane, daleko od mjesta nastanka, te inicirati ponovno oksidacijski stres i lipidnu peroksidaciju.</p>
<p>Jedan od produkata lipidne peroksidacije koji je najvi&#x0161;e istra&#x017E;ivan zbog svojih bioaktivnih svojstava jest HNE. S obzirom na njegovu visoku reaktivnost HNE mo&#x017E;e ulaziti u interakcije s razli&#x010D;itim makromolekulama te tako utjecati na brojne stani&#x010D;ne funkcije i signalne puteve. (<xref ref-type="bibr" rid="r20"><italic>20</italic></xref>&#x2013;<xref ref-type="bibr" rid="r22"><italic>22</italic></xref>) Stoga HNE mo&#x017E;e regulirati ekspresiju gena ili se pak vezati na proteine i DNA, &#x010D;ime uzrokuje njihovo o&#x0161;te&#x0107;enje i/ili poreme&#x0107;aj funkcije. Zbog tih osobina HNE je poput ROS-a uklju&#x010D;en u patogenezu mnogih bolesti, uklju&#x010D;uju&#x0107;i aterosklerozu, neurodegenerativne i tumorske bolesti. (<xref ref-type="bibr" rid="r5"><italic>5</italic></xref>, <xref ref-type="bibr" rid="r15"><italic>15</italic></xref>, <xref ref-type="bibr" rid="r16"><italic>16</italic></xref>) Produkti lipidne peroksidacije mogu se odre&#x0111;ivati u tjelesnim teku&#x0107;inama i smatraju se pouzdanim biljezima oksidacijskog stresa te se ponekad koriste kao dodatni predikcijski biljezi za razne bolesti. (<xref ref-type="bibr" rid="r23"><italic>23</italic></xref>&#x2013;<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>)</p>
</sec>
<sec sec-type="other3">
<title>Ishemijsko-reperfuzijska ozljeda i upala</title>
<p>Ishemijsko-reperfuzijska ozljeda naj&#x010D;e&#x0161;&#x0107;i je oblik potencijalno patolo&#x0161;koga oksidacijskog stresa, posebice u slu&#x010D;aju infarkta miokarda i cerebrovaskularnog inzulta, te uzrokuje upalnu reakciju koja propagira o&#x0161;te&#x0107;enje tkiva oksidacijskim stresom. Smanjena opskrba krvlju, ishemija, uglavnom je uzrokovana vazokonstrikcijom (<xref ref-type="bibr" rid="r26"><italic>26</italic></xref>, <xref ref-type="bibr" rid="r27"><italic>27</italic></xref>), upalom (<xref ref-type="bibr" rid="r28"><italic>28</italic></xref>), aterosklerozom (<xref ref-type="bibr" rid="r29"><italic>29</italic></xref>) ili blokadom protoka ugru&#x0161;cima u trombozi i emboliji. (<xref ref-type="bibr" rid="r30"><italic>30</italic></xref>) Normalizacija protoka krvi kroz zahva&#x0107;eno podru&#x010D;je, reperfuzija, uz pobolj&#x0161;anje opskrbe kisikom dovodi i do ishemijsko-reperfuzijske ozljede, (<xref ref-type="bibr" rid="r31"><italic>31</italic></xref>) koja se naj&#x010D;e&#x0161;&#x0107;e opisuje u srcu, (<xref ref-type="bibr" rid="r32"><italic>32</italic></xref>) mozgu (<xref ref-type="bibr" rid="r33"><italic>33</italic></xref>) i plu&#x0107;ima (<xref ref-type="bibr" rid="r34"><italic>34</italic></xref>), premda i drugi organi tako&#x0111;er mogu biti zahva&#x0107;eni. Ponovljeni napadi ishemije i reperfuzije tako&#x0111;er dovode do stvaranja rana i neuspjeha zacjeljivanja kroni&#x010D;nih rana kao &#x0161;to su dekubitusi i dijabeti&#x010D;ki ulkusi stopala. (<xref ref-type="bibr" rid="r35"><italic>35</italic></xref>) Ishemijsko-reperfuzijska ozljeda tako&#x0111;er igra va&#x017E;nu ulogu u o&#x0161;te&#x0107;enju organa prilikom transplantacije i operativnih zahvata. (<xref ref-type="bibr" rid="r36"><italic>36</italic></xref>, <xref ref-type="bibr" rid="r37"><italic>37</italic></xref>) Da bi se smanjio njen u&#x010D;inak mo&#x017E;e se koristiti otopine antioksidanasa te ishemijsko prekondicioniranje koje se sastoji od kratkih perioda ishemije i reperfuzije. (<xref ref-type="bibr" rid="r38"><italic>38</italic></xref>&#x2013;<xref ref-type="bibr" rid="r40"><italic>40</italic></xref>) Tako dolazi do aktivacije endogenih protektivnih stani&#x010D;nih mehanizama, a tretirana tkiva postaju otpornija na kasniju ishemijsko-reperfuzijsku ozljedu mehanizmom hormeze prema na&#x010D;elu &#x201E;&#x0161;to ne ubije oja&#x010D;a&#x201C;. (<xref ref-type="bibr" rid="r41"><italic>41</italic></xref>, <xref ref-type="bibr" rid="r42"><italic>42</italic></xref>) U ishemijsko-reperfuzijskoj ozljedi dolazi i do lipidne peroksidacije, a krajnji produkti lipidne peroksidacije poput HNE (<xref ref-type="bibr" rid="r17"><italic>17</italic></xref>) uzrokuju stani&#x010D;nu smrt. (<xref ref-type="bibr" rid="r43"><italic>43</italic></xref>&#x2013;<xref ref-type="bibr" rid="r45"><italic>45</italic></xref>) U ishemijsko-reperfuzijskoj ozljedi tako&#x0111;er sudjeluju i reaktivni oblici du&#x0161;ika, koji mogu imati za&#x0161;titnu ulogu u po&#x010D;etnoj fazi ishemije zbog vazodilatacijskog u&#x010D;inka du&#x0161;ikovog oksida na krvne &#x017E;ile, dok je njegova daljnja proizvodnja &#x0161;tetna. (<xref ref-type="bibr" rid="r46"><italic>46</italic></xref>)</p>
<p>Proizvodnja ROS-a tijekom reperfuzije o&#x0161;te&#x0107;uje i aktivira endotelne stanice krvnih &#x017E;ila, pa se upalne stanice ve&#x017E;u se za endotelne stanice i aktiviraju. (<xref ref-type="bibr" rid="r36"><italic>36</italic></xref>, <xref ref-type="bibr" rid="r37"><italic>37</italic></xref>) Aktivirane upalne stanice proizvode upalne citokine i ROS, a tako&#x0111;er sadr&#x017E;e fagocitnu mijeloperoksidazu, koja katalizira stvaranje hipoklorne kiseline te ROS-a i du&#x0161;ikovih radikala. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>, <xref ref-type="bibr" rid="r47"><italic>47</italic></xref>) U upalnoj reakciji tako&#x0111;er dolazi i do lipidne peroksidacije, &#x0161;to pove&#x0107;ava propusnost kapilara i arteriola te dolazi do izlaska teku&#x0107;ine iz krvi u tkiva.</p>
<p>Osim lokalnih u&#x010D;inaka, djelovanje ishemijsko-reperfuzijske ozljede mo&#x017E;e se o&#x010D;itovati i na razini cijelog organizma. Takva su o&#x0161;te&#x0107;enja &#x010D;esta prilikom transplantacije organa i sepse. U slu&#x010D;aju sekundarnog o&#x0161;te&#x0107;enja crijeva dolazi do poreme&#x0107;aja propusnosti stijenke crijeva, zbog &#x010D;ega dolazi i do translokacije bakterija i prolaska endotoksina u krv, &#x0161;to mo&#x017E;e uzrokovati sepsu, (<xref ref-type="bibr" rid="r48"><italic>48</italic></xref>, <xref ref-type="bibr" rid="r49"><italic>49</italic></xref>) a va&#x017E;an medijator pove&#x0107;ane propusnosti crijevne barijere jest i HNE. (<xref ref-type="bibr" rid="r50"><italic>50</italic></xref>)</p>
<p>Upala uklju&#x010D;uje imunolo&#x0161;ki sustav obrane od patogena, ali i olak&#x0161;avanje popravka o&#x0161;te&#x0107;enja tkiva. (<xref ref-type="bibr" rid="r51"><italic>51</italic></xref>, <xref ref-type="bibr" rid="r52"><italic>52</italic></xref>) Fagociti, prvenstveno neutrofilni leukociti i makrofazi, nastoje uni&#x0161;titi patogene ili o&#x0161;te&#x0107;ene stanice, a tijekom fagocitoze kontinuirano stvaraju ROS kroz sna&#x017E;an oksidacijski metabolizam, tzv. oksidacijski &#x201E;prasak&#x201C;. Danas je poznato i da ROS nastale putem oksidacijskog &#x201E;praska&#x201C; uzrokuju nespecifi&#x010D;nu lizu stanica (<xref ref-type="bibr" rid="r53"><italic>53</italic></xref>) te imaju va&#x017E;nu ulogu u progresiji, ali i u regresiji tumora. (<xref ref-type="bibr" rid="r51"><italic>51</italic></xref>, <xref ref-type="bibr" rid="r54"><italic>54</italic></xref>&#x2013;<xref ref-type="bibr" rid="r59"><italic>59</italic></xref>) Najnovija istra&#x017E;ivanja tako&#x0111;er upu&#x0107;uju na va&#x017E;nu ulogu oksidacijskog &#x201E;praska&#x201C; neutrofilnih leukocita u regeneraciji rana. Naime, neutrofilni leukociti putem ROS-a usmjeravaju monocite/makrofage prema proregeneracijskom fenotipu koji je neophodan za regeneraciju. (<xref ref-type="bibr" rid="r60"><italic>60</italic></xref>) Me&#x0111;utim, neu&#x010D;inkovita kroni&#x010D;na upala mo&#x017E;e pogodovati razvoju raznih bolesti kao &#x0161;to su reumatoidni artritis, autoimune bolesti i metaboli&#x010D;ki poreme&#x0107;aji. &#x010C;esta posljedica kroni&#x010D;noga oksidacijskog stresa jest i pove&#x0107;ana koncentracija oksidiranih lipida u cirkulaciji te oksidacija LDL-a (od engl. <italic>low-density lipoprotein</italic>). Oksidirani LDL tako&#x0111;er se smatra jednim od pokreta&#x010D;a upale u krvnim &#x017E;ilama, stoga ateroskleroza uklju&#x010D;uje dugotrajnu lipidnu peroksidaciju i upalu u stijenkama krvnih &#x017E;ila gdje se talo&#x017E;i oksidirani LDL. (<xref ref-type="bibr" rid="r23"><italic>23</italic></xref>)</p>
</sec>
<sec sec-type="other4">
<title>Ateroskleroza i lipidna peroksidacija</title>
<p>Kardiovaskularne bolesti su najva&#x017E;niji uzrok morbiditeta i mortaliteta u razvijenim zemljama, a u osnovi su multifaktorijalne bolesti. Vode&#x0107;i &#x010D;imbenici rizika dijele se na uro&#x0111;ene, kao &#x0161;to su dob, spol i genetski &#x010D;imbenici, i promjenjive koji su zna&#x010D;ajniji jer se na njih promjenom pona&#x0161;anja i navika mo&#x017E;e utjecati. Kao vode&#x0107;i &#x010D;imbenici rizika isti&#x010D;u se povi&#x0161;ene razine kolesterola i drugih lipida, hipertenzija, pu&#x0161;enje, pridru&#x017E;ene metaboli&#x010D;ke bolesti kao dijabetes, pretilost te sjedila&#x010D;ki na&#x010D;in &#x017E;ivota, uz isticanje sve va&#x017E;nije uloge oksidacijskog stresa kao okida&#x010D;a ili dodatnog kofaktora u nastanku bolesti iz ove skupine. Oksidacijski stres ima va&#x017E;nu ulogu u nastanku ateroskleroze, koja se prema suvremenoj hipotezi &#x201E;odgovora na ozljedu&#x201C; definira kao kroni&#x010D;ni upalni odgovor i cijeljenje arterijske stijenke koji nastaju kao odgovor na o&#x0161;te&#x0107;enja endotela. Smatra se da aterosklerotski plak nastaje uslijed interakcije LDL-a i njegovih oksidiranih oblika koji sadr&#x017E;e HNE-proteinske konjugate (<xref ref-type="fig" rid="f3">Figure 3</xref>) te upalnih stanica s endotelnim i glatkomi&#x0161;i&#x0107;nim stanicama u stijenkama arterija. Ovaj oblik upalnog zbivanja rezultira ozljedom endotela, &#x0161;to dovodi do aktivacije makrofaga i stvaranja ROS-a, &#x0161;to pak dovodi do akumulacije lipida u pjenu&#x0161;avim makrofazima. Radi se o procesu koji u koegzistenciji s prethodno spomenutim &#x010D;imbenicima rizika dovodi do procesa koji zapo&#x010D;inje ve&#x0107; u ranim tridesetim godinama &#x017E;ivota, me&#x0111;utim bez klini&#x010D;kih simptoma, da bi do klini&#x010D;ke manifestacije ateroskleroze i bolesti kojima je ona u podlozi do&#x0161;lo desetlje&#x0107;ima kasnije. Niz studija je dokazao ulogu oksidacijskog stresa u nastanku ateroskleroze, hipertenzije, ishemi&#x010D;ne bolesti srca i kardiomiopatija. (<xref ref-type="bibr" rid="r61"><italic>61</italic></xref>, <xref ref-type="bibr" rid="r62"><italic>62</italic></xref>)</p>
<fig id="f3" position="float" fig-type="figure"><label>Figure 3</label><caption><p>The example of immunohistochemically positive HNE-protein adducts (brown, indicated by the arrow) in atherosclerotic plaque within the intima of the aorta (magnification 100x)</p></caption><graphic xlink:href="LV-148-45-f3"></graphic></fig>
</sec>
<sec sec-type="other5">
<title>Oksidacijski stres u patogenezi neurodegenerativnih bolesti</title>
<p>Oksidacijski stres se povezuje s nastankom niza neurolo&#x0161;kih bolesti, od ishemijskih preko upalnih do metaboli&#x010D;kih i degenerativnih, od &#x010D;ega se izdvaja utjecaj na razvoj Parkinsonove i Alzheimerove bolesti, multiple skleroze, amiotrofi&#x010D;ne lateralne skleroze (ALS) i depresije. Peroksidacija lipida u stani&#x010D;nim membranama neurona dovodi do stvaranja HNE-a, pa se visoke koncentracije HNE-a mogu na&#x0107;i u tkivu mozga i u likvoru osoba oboljelih od Alzheimerove bolesti, a tako&#x0111;er i u kralje&#x017E;ni&#x010D;koj mo&#x017E;dini oboljelih od ALS-a. Njegov zna&#x010D;aj se nalazi i u &#x010D;injenici da se prisutnost HNE-a mo&#x017E;e dokazati u sredi&#x0161;njem &#x017E;iv&#x010D;anom sustavu oboljelih od Alzheimerove bolesti, ALS-a i Parkinsonove bolesti. (<xref ref-type="bibr" rid="r16"><italic>16</italic></xref>) Tako se u mozgu oboljelih od Alzheimerove bolesti stvara <italic>&#x03B2;</italic>-amiloid, oligopeptidni spoj konjugiran HNE-om, koji se tako&#x0111;er nalazi u mozgu, &#x0161;to se mo&#x017E;e dokazati imunohistokemijski (<xref ref-type="fig" rid="f4">Figure 4</xref>), a smatra se uzrokom neurodegenerativnih promjena. (<xref ref-type="bibr" rid="r63"><italic>63</italic></xref>)</p>
<fig id="f4" position="float" fig-type="figure"><label>Figure 4</label><caption><p>Immunohistochemically positive reaction for the HNE-protein adducts (brown) in the brain cortex of a patient with Alzheimer&#x2019;s disease, circular positivity is visible in the blood vessel, while the granular positivity is visible in the senile plaque (magnification 400x).</p></caption><graphic xlink:href="LV-148-45-f4"></graphic></fig>
</sec>
<sec sec-type="other6">
<title>Oksidacijski stres, lipidna peroksidacija i zlo&#x0107;udni tumori</title>
<p>Karcinogeneza je vi&#x0161;efazni proces koji uklju&#x010D;uje inicijaciju, promociju i progresiju stanica prema malignom fenotipu. Oksidacijski stres igra klju&#x010D;nu ulogu u svakoj od ovih faza. Oksidacijski stres sve se vi&#x0161;e prepoznaje kao klju&#x010D;ni &#x010D;imbenik u onkogenezi, a njegova uloga u razli&#x010D;itim vrstama zlo&#x0107;udnih tumora predmet je intenzivnih istra&#x017E;ivanja. Iako pospje&#x0161;uju rast i razvoj tumora, visoke razine ROS-a ujedno imaju i citotoksi&#x010D;no djelovanje. (<xref ref-type="bibr" rid="r64"><italic>64</italic></xref>) Tumorske stanice su osjetljivije od normalnih stanica na toksi&#x010D;no djelovanje ROS-a i HNE-a, te nastoje izbje&#x0107;i lipidnu peroksidaciju, a normalne stanice nastoje poja&#x010D;ano stvarati HNE radi obrane od tumorske invazije. Pri tome treba imati na umu i da su razli&#x010D;iti oblici onkolo&#x0161;ke terapije vezani upravo uz citotoksi&#x010D;no djelovanje ROS-a i produkata lipidne peroksidacije, a oksidacijski stres se javlja i tijekom kirur&#x0161;kih zahvata, posebice putem ishemijsko-reperfuzijske ozljede. (<xref ref-type="bibr" rid="r65"><italic>65</italic></xref>, <xref ref-type="bibr" rid="r66"><italic>66</italic></xref>) Usprkos tomu, oksidacijski stres se do&#x017E;ivljava prvenstveno kao bitan &#x010D;imbenik karcinogeneze. U raku plu&#x0107;a oksidacijski stres je &#x010D;esto izazvan vanjskim &#x010D;imbenicima poput cigaretnog dima i zaga&#x0111;enja zraka koji uzrokuju lipidnu peroksidaciju, &#x0161;to doprinosi mutacijama koje vode do zlo&#x0107;udne promjene, ali i omogu&#x0107;ava pove&#x0107;anu invazivnost i kapacitet za &#x0161;irenje tumora. Ekspresija HNE-a je povi&#x0161;ena u raku plu&#x0107;a, a povezana je s veli&#x010D;inom tumora te ima potencijal u pra&#x0107;enju odgovora na terapiju (<xref ref-type="fig" rid="f5">Figure 5</xref>). Zanimljivo je da biljezi lipidne peroksidacije kod metastaza u plu&#x0107;ima pokazuju vi&#x0161;u ekspresiju u okolnom netumorskom tkivu nego &#x0161;to je to slu&#x010D;aj kod primarnog karcinoma plu&#x0107;a, &#x0161;to mo&#x017E;e predstavljati mehanizam obrane protiv metastatskog karcinoma. (<xref ref-type="bibr" rid="r67"><italic>67</italic></xref>)</p>
<fig id="f5" position="float" fig-type="figure"><label>Figure 5</label><caption><p>The immunohistochemical appearance of the HNE-positive protein adducts (brown) in atypical cells of the planocellular carcinoma of the lungs, as well as in inflammatory cells within the tumor tissue (magnification 200 x)</p></caption><graphic xlink:href="LV-148-45-f5"></graphic></fig>
<p>Oksidacijski stres ima va&#x017E;nu ulogu i u nastanku raka dojke koji je jedan od naj&#x010D;e&#x0161;&#x0107;ih zlo&#x0107;udnih tumora &#x017E;ena, budu&#x0107;i da ROS izazivaju o&#x0161;te&#x0107;enje DNA, &#x0161;to mo&#x017E;e rezultirati mutacijama u onkogenu <italic>HER2</italic> i inaktivaciji tumor-supresorskih gena. Ekspresija biljega oksidacijskog stresa u karcinomu dojke je kompleksna; pokazano je da je ekspresija 8-hidroksideoksiguanozina (8-OHdG) i HNE-a prisutna ve&#x0107; u netumorskim proliferativnim promjenama poput uobi&#x010D;ajene duktalne hiperplazije, no razvojem invazivnog karcinoma ekspresija 8-OHdG se smanjuje (&#x0161;to se poku&#x0161;ava objasniti indukcijom popravka DNA), dok ekspresija HNE-a raste. (<xref ref-type="bibr" rid="r68"><italic>68</italic></xref>) Rak debelog crijeva tako&#x0111;er pokazuje zna&#x010D;ajnu povezanost s oksidacijskim stresom. Kao i u slu&#x010D;aju drugih tumora, ROS mogu izazvati o&#x0161;te&#x0107;enje DNA, &#x0161;to doprinosi aktivaciji onkogena i inaktivaciji tumor-supresorskih gena. Tumorske stanice raka debelog crijeva mogu izbje&#x0107;i regulaciju rasta posredovanu lipidnom peroksidacijom, dok vi&#x0161;estruko nezasi&#x0107;ene masne kiseline i &#x017E;eljezo iz hemoglobina mogu poticati kolorektalnu karcinogenezu. (<xref ref-type="bibr" rid="r69"><italic>69</italic></xref>, <xref ref-type="bibr" rid="r70"><italic>70</italic></xref>)</p>
<p>Kao i kod ovih zlo&#x0107;udnih tumora, postoji povezanost lipidne peroksidacije s drugim zlo&#x0107;udnim tumorima, premda je rije&#x010D; o vrlo razli&#x010D;itim vrstama tumora. Tako nazo&#x010D;nost akroleina u kombinaciji s ostalim prognosti&#x010D;kim &#x010D;imbenicima poput stadija bolesti ili pozitivnih rubova vrlo pouzdano mo&#x017E;e predvidjeti biokemijski relaps bolesti. (<xref ref-type="bibr" rid="r71"><italic>71</italic></xref>) Na temelju istra&#x017E;ivanja uzoraka plazme, &#x010D;ini se da HNE ima ulogu u modifikaciji metabolizma nezasi&#x0107;enih masnih kiselina u pacijenata s karcinomom prostate, s posljedi&#x010D;nom promjenom metaboloma iako se HNE u tkivu karcinoma prostate rijetko nalazi i to uglavnom u stromalnim stanicama. (<xref ref-type="bibr" rid="r72"><italic>72</italic></xref>) Nadalje, u glijalnih tumora sredi&#x0161;njega &#x017E;iv&#x010D;anog sustava pokazano je da ekspresija HNE-a raste s gradusom tumora, pa je tako sna&#x017E;nija i difuznija u glioblastomu i anaplasti&#x010D;nom astrocitomu negoli u difuznom astrocitomu, (<xref ref-type="bibr" rid="r73"><italic>73</italic></xref>, <xref ref-type="bibr" rid="r74"><italic>74</italic></xref>) &#x0161;to je sli&#x010D;no i kod tumora ependimalnog podrijetla, uz napomenu da i tkivo mozga poja&#x010D;ano stvara HNE u blizini tumora. (<xref ref-type="bibr" rid="r75"><italic>75</italic></xref>) U slu&#x010D;aju stanica osteosarkoma pokazano je pak da HNE inhibira proliferaciju i poti&#x010D;e apoptozu u u&#x010D;inku razmjernom koncentraciji i stupnju diferencijacije tumorskih stanica, &#x0161;to je najvjerojatnije povezano s u&#x010D;inkom na metabolizam masnih kiselina i redoks signalizaciju. (<xref ref-type="bibr" rid="r76"><italic>76</italic></xref>&#x2013;<xref ref-type="bibr" rid="r78"><italic>78</italic></xref>) Kod karcinoma jetre, HNE ima ulogu u inicijaciji tumorskog rasta kao i u kontroli apoptoze, pogotovo ako normalne jetrene stanice pove&#x0107;ano stvaraju HNE. (<xref ref-type="bibr" rid="r79"><italic>79</italic></xref>, <xref ref-type="bibr" rid="r80"><italic>80</italic></xref>) Naposlijetku, u karcinomu orofarinksa zabilje&#x017E;ena je nagla&#x0161;ena ekspresija HNE-a u dobro diferenciranog i umjereno diferenciranog plo&#x010D;astog karcinoma, u odnosu na normalno tkivo, no s porastom gradusa karcinoma u slabo diferenciranim tumorima ekspresija HNE-a naglo pada uz istodoban rast u okolnom netumorskom tkivu (fenomen sli&#x010D;an onomu opisanom u plu&#x0107;nim metastazama karcinoma kolona, u tkivu mozga uz glioblastom i u jetri). (<xref ref-type="bibr" rid="r81"><italic>81</italic></xref>)</p>
</sec>
<sec sec-type="other7">
<title>Zaklju&#x010D;ak</title>
<p>Oksidacijski stres i lipidna peroksidacija imaju va&#x017E;an utjecaj na ljudsko zdravlje. Dokazano je u nizu istra&#x017E;ivanja kako su upravo ROS va&#x017E;na karika u zapo&#x010D;injanju i progresiji niza bolesti, od kojih isti&#x010D;emo s jedne strane kardiovaskularne, upalne i neurodegenerativne bolesti, a na drugoj strani zlo&#x0107;udne tumore kao iznimno va&#x017E;ne zbog njihove visoke incidencije, prevalencije, morbiditeta i mortaliteta.</p>
<p>Zna&#x010D;aj oksidacijskog stresa ogleda se u &#x010D;injenici da se dio spojeva koji pritom nastaju, poput zavr&#x0161;nog produkta lipidne peroksidacije HNE-a, mogu izolirati iz ljudskih stanica, tkiva te tjelesnih teku&#x0107;ina, &#x0161;to predstavlja potencijalno va&#x017E;an dijagnosti&#x010D;ki, ali i terapijski aspekt istra&#x017E;ivanja bolesti vezanih uz starenje i stres.</p>
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