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<article article-type="review-article" dtd-version="1.0" xml:lang="hr" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML">
<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-143-220</article-id>
<article-id pub-id-type="doi">10.26800/LV-143-5-6-9</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group>
</article-categories>
<title-group>
<article-title>Uloga nealkoholne masne bolesti jetre u bakterijskim infekcijama i sepsi</article-title>
<trans-title-group xml:lang="en">
<trans-title>The role of non-alcoholic fatty liver disease in bacterial infections and sepsis</trans-title>
</trans-title-group>
</title-group>
<contrib-group>
<contrib contrib-type="author"><name><surname>Krznari&#x0107;</surname><given-names>Juraj</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Miji&#x0107;</surname><given-names>Maja</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>&#x0160;tromar Kne&#x017E;evi&#x0107;</surname><given-names>Ivana</given-names></name><xref ref-type="aff" rid="aff3"><sup>3</sup></xref><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>&#x0160;uk</surname><given-names>Dora</given-names></name><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Filipec Kani&#x017E;aj</surname><given-names>Tajana</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Vince</surname><given-names>Adriana</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5784-1343</contrib-id><name><surname>Papi&#x0107;</surname><given-names>Neven</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib>
<aff id="aff1"><label>1</label>Klinika za infektivne bolesti &#x201E;Dr. Fran Mihaljevi&#x0107;&#x201D;, <addr-line>Zagreb</addr-line></aff>
<aff id="aff2"><label>2</label><institution>Klini&#x010D;ka bolnica Merkur</institution>, <addr-line>Zagreb</addr-line></aff>
<aff id="aff3"><label>3</label><institution>Klini&#x010D;ki bolni&#x010D;ki centar Zagreb</institution>, <addr-line>Zagreb</addr-line></aff>
<aff id="aff4"><label>4</label><institution>Medicinski fakultet, Sveu&#x010D;ili&#x0161;te u Zagrebu</institution>, <addr-line>Zagreb</addr-line></aff>
</contrib-group>
<author-notes>
<corresp id="cor1">Adresa za dopisivanje: Dr. sc. Neven Papi&#x0107;, dr. med., <ext-link ext-link-type="uri" xlink:href="https://orcid.org/0000-0001-5784-1343">https://orcid.org/0000-0001-5784-1343</ext-link> Klinika za infektivne bolesti &#x201E;Dr. Fran Mihaljevi&#x0107;&#x201D;, Mirogojska 8, 10000 Zagreb, e-po&#x0161;ta: <email xlink:href="npapic@bfm.hr">npapic@bfm.hr</email></corresp></author-notes>
<pub-date pub-type="epub-ppub"><month>07</month><year>2021</year></pub-date>
<volume>143</volume>
<issue>5-6</issue>
<fpage>220</fpage>
<lpage>226</lpage>
<permissions>
<copyright-year>2021</copyright-year>
<copyright-holder>Croatian Medical Association</copyright-holder>
<license xlink:href="http://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>Nealkoholna masna bolest jetre (engl. <italic>non-alcoholic fatty liver disease</italic>, NAFLD) naj&#x010D;e&#x0161;&#x0107;a je kroni&#x010D;na bolest jetre, a povezana je sa sustavnim promjenama imunosnog odgovora koje poti&#x010D;u progresiju u nealkoholni steatohepatitis (NASH), cirozu jetre i razvoj hepatocelularnog karcinoma. Glavni rizi&#x010D;ni &#x010D;imbenici za razvoj NAFLD-a jesu komponente metaboli&#x010D;kog sindroma, pretilost i &#x0161;e&#x0107;erna bolest, koje su poznati rizi&#x010D;ni &#x010D;imbenici za razvoj infekcija. Me&#x0111;utim, sve je vi&#x0161;e podataka o povezanosti NAFLD-a s bakterijskim infekcijama, neovisno o ostalim komponentama metaboli&#x010D;kog sindroma. Kod bolesnika s NAFLD-om opisane su &#x010D;e&#x0161;&#x0107;e rekuriraju&#x0107;e bakterijske infekcije, uroinfekcije, bakterijemije gastrointestinalnog ishodi&#x0161;ta, enterokolitis <italic>Clostridoides difficile</italic>, kao i te&#x017E;a klini&#x010D;ka slika i nepovoljni ishod pneumonije. Rastu&#x0107;a prevalencija NAFLD-a i NASH-a zahtjeva nove terapijske i profilakti&#x010D;ke pristupe bazirane na boljem razumijevanju imunopatogeneze bakterijskih infekcija u ovoj skupini bolesnika.</p>
</abstract>
<trans-abstract xml:lang="en">
<title>SUMMARY</title>
<p>Non-alcoholic fatty liver disease (NAFLD) is the most common chronic liver disease associated with systemic changes in immune response that drives the progression to non-alcoholic steatohepatitis (NASH), liver cirrhosis, and hepatocellular carcinoma (HCC). Major risk factors of NAFLD include obesity and type 2 diabetes mellitus which are associated with infections. However, there is growing evidence that NAFLD is linked with bacterial infections independently of other components of metabolic syndrome. Patients with NAFLD have been described to have more common recurrent bacterial infections, urinary tract infections, bacteriemia of gastrointestinal origin, <italic>Clostridoides difficile</italic> enterocolitis, and more severe pneumonia. The rapidly increasing prevalence of NAFLD and NASH require novel therapeutic and prophylactic approaches based on a better understanding of immunopathogenesis of bacterial infections in these patients.</p>
</trans-abstract>
<kwd-group kwd-group-type="author"><kwd>Deskriptori NEALKOHOLNA MASNA BOLEST JETRE &#x2013; epidemiologija, imunologija, komplikacije</kwd><kwd>JETRA &#x2013; imunologija</kwd><kwd>BAKTERIJSKE INFEKCIJE &#x2013; epidemiologija, etiologija</kwd><kwd>SEPSA &#x2013; epidemiologija, etiologija</kwd></kwd-group>
<kwd-group kwd-group-type="translator" xml:lang="en"><title>Descriptors </title><kwd>NON-ALCOHOLIC FATTY LIVER DISEASE &#x2013; complications, epidemiology, immunology</kwd><kwd>LIVER &#x2013; immunology</kwd><kwd>BACTERIAL INFECTIONS &#x2013; epidemiology, etiology</kwd><kwd>SEPSIS &#x2013; epidemiology, etiology</kwd></kwd-group>
</article-meta>
</front>
<body>
<p>Nealkoholna masna bolest jetre (engl. <italic>non-alcoholic fatty liver disease</italic>, NAFLD) naj&#x010D;e&#x0161;&#x0107;a je kroni&#x010D;na bolest jetre u zapadnim zemljama, s prevalencijom koja u zapadnim zemljama iznosi i do 40%. (<xref ref-type="bibr" rid="r1"><italic>1</italic></xref>) Osim dobro opisane povezanosti s metaboli&#x010D;kim sindromom, NAFLD se danas povezuje i s razvojem kardiovaskularne bolesti, kroni&#x010D;nom bubre&#x017E;nom bolesti i razvojem karcinoma. (<xref ref-type="bibr" rid="r2"><italic>2</italic></xref>) Translacijska istra&#x017E;ivanja otkrila su niz sustavnih promjena u imunosnom i upalnom odgovoru koji su klju&#x010D;ni za progresiju bolesti u nealkoholni steatohepatitis (NASH) i cirozu, a isti mehanizmi imaju va&#x017E;nu ulogu i u obrani od bakterijskih infekcija. (<xref ref-type="bibr" rid="r2"><italic>2</italic></xref>) Postoji sve vi&#x0161;e podataka o povezanosti NAFLD-a s rizikom od razvoja bakterijskih infekcija, sepse i njezinih komplikacija. U ovom preglednom radu opisat &#x0107;emo trenuta&#x010D;ne spoznaje o imunosnoj disfunkciji u bolesnika s NAFLD-om i njihov utjecaj na razvoj, komplikacije i ishod bakterijskih infekcija.</p>
<sec sec-type="other1">
<title>Uloga jetre u bakterijskim infekcijama</title>
<p>Smatra se da je jetra odgovorna za 500 razli&#x010D;itih fiziolo&#x0161;kih funkcija, uklju&#x010D;uju&#x0107;i detoksikaciju, proizvodnju energije, preradu nutrijenata, hormonsku ravnote&#x017E;u, imunosni odgovor i koagulaciju, &#x0161;to je &#x010D;ini klju&#x010D;nim organom za pre&#x017E;ivljavanje u sepsi (<xref ref-type="fig" rid="f1">Figure 1</xref>). Jetra je klju&#x010D;na u procesu odstranjenja bakterija i toksina iz krvotoka. U &#x017E;ivotinjskim modelima sepse vi&#x0161;e od 60% bakterija bude eliminirano u jetri unutar prvih 10 minuta, a 80% unutar 6 sati od bakterijske inokulacije. (<xref ref-type="bibr" rid="r3"><italic>3</italic></xref>) Lipopolisaharid (LPS), jedan od klju&#x010D;nih aktivatora upalne reakcije u bakterijskoj infekciji, tako&#x0111;er se razgra&#x0111;uje u jetri. Jetra proizvodi proteine akutne faze upalne reakcije koji doprinose sistemskoj aktivaciji imunosnog odgovora, djeluju&#x0107;i kao opsonini, aktiviraju&#x0107;i neutrofile i/ili makrofage i aktivacijom antimikrobnih funkcija sustava komplementa (<xref ref-type="table" rid="t1">Table 1</xref>). (<xref ref-type="bibr" rid="r4"><italic>4</italic></xref>) Isto je pokazano na mi&#x0161;jim modelima bez odgovora akutne faze, a u kojih je mortalitet uzrokovan sepsom zna&#x010D;ajno vi&#x0161;i u usporedbi s divljim mi&#x0161;evima. (<xref ref-type="bibr" rid="r5"><italic>5</italic></xref>, <xref ref-type="bibr" rid="r6"><italic>6</italic></xref>) Osim &#x0161;to stvara upalne citokine, jetra tako&#x0111;er stvara protuupalne medijatore kao npr. interleukin-10, transformiraju&#x0107;i &#x010D;imbenik rasta &#x03B2; i glukokortikoide. Uravnote&#x017E;eni upalni i protuupalni odgovor rezultira eliminacijom bakterija i razrje&#x0161;enjem upale, dovode&#x0107;i do oporavka od sepse. (<xref ref-type="bibr" rid="r7"><italic>7</italic></xref>, <xref ref-type="bibr" rid="r8"><italic>8</italic></xref>)</p>
<fig id="f1" position="float" fig-type="figure"><label>Figure 1</label><caption><p>Metabolic and immunological roles of hepatocytes in bacterial infections</p></caption><graphic xlink:href="LV-143-220-f1"></graphic></fig>
<table-wrap id="t1" position="float">
<label>Table 1</label><caption><title>Synthesis of the acute phase proteins in the liver</title>
</caption>
<table frame="hsides" rules="groups">
<col width="18.94%"/>
<col width="41.42%"/>
<col width="39.64%"/>
<thead>
<tr>
<th valign="middle" align="left" scope="col" style="border-left: solid 0.75pt; border-top: solid 0.75pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">Proteini akutne faze<break/>/ Acute phase proteins</th>
<th valign="middle" align="left" scope="col" style="border-left: solid 0.50pt; border-top: solid 0.75pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">Biolo&#x0161;ki medijatori<break/>/ Biological modifiers</th>
<th valign="middle" align="left" scope="col" style="border-left: solid 0.50pt; border-top: solid 0.75pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Imunolo&#x0161;ka funkcija / Immune function</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt" scope="row">Proteini komplementa<break/>/ Complement proteins</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">C3, C4, C9, protein koji ve&#x017E;e C4b lektin koji ve&#x017E;e manozu (MBL), inhibitor C1 esteraze<break/>/ C3, C4, C9, C4b-binding protein, mannose-binding lectin, C1 esterase inhibitor</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Pobolj&#x0161;anje fagocitoze; kemoatraktanti; degranulacija neutrofila; indukcija lize bakterijskih stanica; pove&#x0107;anje vaskularne permeabilnosti<break/>/ enhanced phagocytosis, chemoattractants, neutrophil degranulation; bacterial cell wall lysis; vascular permeability</td>
</tr>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt" scope="row">Upalni proteini<break/>/ Inflammatory proteins</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">IL-6, lipopolisaharid-vezuju&#x0107;i protein, fosfolipaza A2<break/>/ IL-6, lipopolysaccharide-binding protein and secreted phospholipase A2</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Poja&#x010D;avaju proupalne signale i potenciraju odgovor akutne faze jetre / enhance pro-inflammatory signals and potentiate acute response</td>
</tr>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt" scope="row"></td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">C-reaktvni protein, MBL, jetreni kolektin 1, fikolin-2, serumski amiloid P, serumski amiloid A<break/>/ C-reactive protein, mannose-binding lectin, collectin liver 1, ficolin-2, serum amyloid P, serum amyloid A</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Receptori koji prepoznaju patogene ili obrasce pridru&#x017E;ene patogenima; aktivacija komplementa; pobolj&#x0161;anje fagocitoze<break/>/ Secreted pathogen-recognition receptors;<break/>activation of complement; enhanced phagocytosis</td>
</tr>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt" scope="row">Proteini negativne faze upalnog odgovora jetre<break/>/ Negative acute phase proteins</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">Albumin, transferin, trastiretin, protein koji ve&#x017E;e retinol, antitrombin, transkortin, inzulinu sli&#x010D;an &#x010D;imbenik rasta 1, glikoprotein A2 HS, alfa-fetoprotein, faktor XII / albumin, transferrin, transthyretin, retinol-binding protein, antithrombin, transcortin, insuilin like growth factor 1, A2 HS glycoprotein, alpha-fetoprotein, factor XII</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Uspostava homeostaze, metabolizam, transporterski proteini<break/>/ homeostasis, metabolism, transporter proteins</td>
</tr>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt" scope="row">Inhibitori proteaze<break/>/ Protease inhibitors</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">&#x03B1;2-makoglobulin, &#x03B1;1-antitripsin, &#x03B1;1-antikimotripsin<break/>/ &#x03B1;<sub>2</sub>-macroglobulin, &#x03B1;<sub>1</sub>-antitrypsin, &#x03B1;<sub>1</sub>-antichymotrypsin</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Protuupalno djelovanje<break/>/ anti-inflammatory role</td>
</tr>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt" scope="row">Antimikrobni proteini<break/>/ Antimicrobial proteins</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">Antimikrobni peptid 2, hepcidin<break/>/ liver expressed antimicrobial peptide 2, hepcidin</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Antimikrobno djelovanje<break/>/ Antimicrobial activity</td>
</tr>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt" scope="row">Faktori zgru&#x0161;avanja<break/>/ Clotting factors</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.50pt">Fibrinogen, plazminogen, protein S, protrombin, faktor VIII, faktor IX i faktor Von Willebrand, vitronektin<break/>/ Fibrinogen, plasminogen, protein S, prothrombin, factor VIII, factor IX and Von Willebrand factor, vitronectin</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.50pt">Koagulacija i fibrinoliza<break/>/ Coagulation and fibrinolysis</td>
</tr>
<tr>
<td valign="top" align="left" style="border-left: solid 0.75pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.75pt" scope="row">Proteini koji ve&#x017E;u &#x017E;eljezo<break/>/ Iron-binding proteins</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.50pt; border-bottom: solid 0.75pt">Haptoglobin, hemopeksin, feritin, hepcidin<break/>/ Haptoglobin, hemopexin, ferritin, hepcidin</td>
<td valign="top" align="left" style="border-left: solid 0.50pt; border-top: solid 0.50pt; border-right: solid 0.75pt; border-bottom: solid 0.75pt">Reduciraju slobodno &#x017E;eljezo u serumu; antimikrobno djelovanje / Reduction of free iron in the serum; antimicrobial functions</td>
</tr>
</tbody>
</table><table-wrap-foot>
<p>Kratice / Abbreviations:</p>
<p>IFN&#x03B3; = interferon &#x03B3;; IL = interleukin; KC = Kupfferove stanice / Kupffer cells; LPS = lipopolisaharid / lipopolysaccharide; TGF&#x03B2; = transformiraju&#x0107;i &#x010D;imbenik rasta &#x03B2; / transforming growth factor &#x03B2;; Th1 = limfociti Th1 / T helper 1 lymphocytes; Th2 = limfociti Th2 / T helper 2 lymphocytes; Th17 = limfociti Th17 / T helper 17 lymphocytes; Th22 = limfociti Th22 / T helper 22 lymphocytes; TNF&#x03B1; = tumor-nekrotiziraju&#x0107;i &#x010D;imbenik &#x03B1; 7 tumor necrosis factor &#x03B1;; Treg = regulatorni limfociti T / regulatory T lymphocytes.</p>
</table-wrap-foot></table-wrap>
<p>Istra&#x017E;ivanja su pokazala kako je disfunkcija jetre tijekom sepse u bolesnika bez prethodne jetrene bolesti nezavisni prediktor mortaliteta (54&#x2013;65%), koji je vi&#x0161;i nego mortalitet kod sepse komplicirane akutnom bubre&#x017E;nom ili respiratornom insuficijencijom. (<xref ref-type="bibr" rid="r8"><italic>8</italic></xref>) Nadalje, bolesnici s cirozom jetre su pod pove&#x0107;anim rizikom razvoja bakterijskih infekcija i imaju deset puta &#x010D;e&#x0161;&#x0107;e bakterijemije s &#x010D;etverostruko vi&#x0161;im mortalitetom u usporedbi s bolesnicima bez ciroze jetre. Progresija u septi&#x010D;ki &#x0161;ok u ovih bolesnika je povezana s mortalitetom i do 70%. (<xref ref-type="bibr" rid="r7"><italic>7</italic></xref>) Ova klini&#x010D;ka zapa&#x017E;anja isti&#x010D;u va&#x017E;nost jetre kao imunomodulatornog organa. Stoga bi moduliranje funkcije jetre i njezina imunolo&#x0161;kog odgovora tijekom sepse moglo biti nova strategija za regulaciju sustavnoga imunosnog odgovora i za&#x0161;tite organa od o&#x0161;te&#x0107;enja.</p>
</sec>
<sec sec-type="other2">
<title>NAFLD i imunosna disfunkcija</title>
<p>Premda patogeneza NAFLD-a jo&#x0161; uvijek nije posve razja&#x0161;njena, dosada&#x0161;nja saznanja najvi&#x0161;e podupiru tzv. &#x201E;teoriju vi&#x0161;estrukih udaraca&#x201D;, &#x0161;to podrazumijeva djelovanje vi&#x0161;e &#x010D;imbenika (inzulinska rezistencija, abnormalno otpu&#x0161;tanje adipokina, lipotoksi&#x010D;nost, imunosni odgovor i brojni epigenetski &#x010D;imbenici) kod genetski predisponiranih osoba. (<xref ref-type="bibr" rid="r9"><italic>9</italic></xref>) Inzulinska rezistencija (IR) uzrokuje poreme&#x0107;aje metabolizma masti (ubrzana lipoliza u masnim stanicama uz pove&#x0107;anu lipogenezu u jetri), &#x0161;to dovodi do pove&#x0107;ane koncentracije slobodnih masnih kiselina u jetri koje se nakupljaju u obliku triglicerida (TG). (<xref ref-type="bibr" rid="r9"><italic>9</italic></xref>) Tako&#x0111;er, IR dovodi do disfunkcije masnog tkiva i posljedi&#x010D;noga abnormalnog otpu&#x0161;tanja adipokina i citokina. (<xref ref-type="bibr" rid="r9"><italic>9</italic></xref>) Novije studije nagla&#x0161;avaju ulogu imunolo&#x0161;kog odgovora kao glavnog pokreta&#x010D;a u patogenezi NAFLD-a i razvoju hepatitisa i fibroze, &#x0161;to &#x010D;ini NAFLD multisistemskom bolesti.</p>
<p>Promjene imunolo&#x0161;kog odgovora odvijaju se na razini stani&#x010D;ne imunosti (leukocita te odre&#x0111;enih subpopulacija limfocita) i citokina. Bolesnici s NAFLD-om imaju vi&#x0161;e serumske koncentracije upalnih biomarkera, kao &#x0161;to su C-reaktivni protein (CRP) i interleukini (IL) (specifi&#x010D;no IL-6, IL-17, leptin, tumor-nekrotiziraju&#x0107;i &#x010D;imbenik &#x03B1; (TNF-&#x03B1;) i transformiraju&#x0107;i &#x010D;imbenik rasta &#x03B2; (TGF-&#x03B2;), &#x010D;ije koncentracije koreliraju s pojavom i prognozom NAFLD-a. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>) Omjer apsolutnog broja neutrofila i limfocita (engl. <italic>neutrophil-to-lymphocyte ratio</italic>, NLR) smatra se biomarkerom te&#x017E;ine NAFLD-a te je pokazano da bolesnici s uznapredovalom upalom i fibrozom jetre imaju pove&#x0107;an broj neutrofila u odnosu na limfocite. (<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>) Neravnote&#x017E;a broja neutrofila i limfocita ima za posljedicu neravnote&#x017E;u u produkciji citokina, &#x0161;to posljedi&#x010D;no dovodi do vi&#x0161;ih razina IL-6 koji poti&#x010D;e upalu i va&#x017E;nije, diferencijaciju subpopulacije limfocita Th-17. (<xref ref-type="bibr" rid="r12"><italic>12</italic></xref>) Naime, dvije subpopulacije CD4+ limfocita T nastaju iz pomo&#x0107;ni&#x010D;kih limfocita T: regulacijski limfociti T (Treg) i Th17, &#x010D;iji odnos poma&#x017E;e odr&#x017E;avati ravnote&#x017E;u izme&#x0111;u borbe protiv mikroorganizama i imunolo&#x0161;ke supresije, a s ciljem sprje&#x010D;avanja o&#x0161;te&#x0107;enja tkiva pretjeranom upalnom reakcijom. (<xref ref-type="bibr" rid="r13"><italic>13</italic></xref>) Pritom limfociti Th17 imaju sna&#x017E;no proupalno djelovanje, lu&#x010D;e interleukine IL-17, IL-21 i IL22 koji sudjeluju u imunosnoj obrani od mikroorganizama, kao i u patogenezi brojnih kroni&#x010D;nih bolesti. IL-17 je proupalni citokin koji poti&#x010D;e razvoj hepatitisa i fibroze jetrenih stanica, aktivaciju neutrofila i produkciju drugih medijatora upale kao &#x0161;to su TNF-&#x03B1;, IL-1 i IL-6. (<xref ref-type="bibr" rid="r14"><italic>14</italic></xref>, <xref ref-type="bibr" rid="r15"><italic>15</italic></xref>) Poja&#x010D;ano lu&#x010D;enje proupalnih citokina poti&#x010D;e dodatnu diferencijaciju Th17 u odnosu na regulatorne limfocite (Treg), &#x0161;to dovodi do hiperaktivacije sustava Th17/IL-17, &#x010D;ime se podr&#x017E;ava upalna aktivnost i fibrinogeneza u jetri. (<xref ref-type="bibr" rid="r16"><italic>16</italic></xref>) Tako&#x0111;er, istra&#x017E;ivanja su pokazala da bolesnici s NAFLD-om imaju sni&#x017E;enu koncentraciju protuupalnih i antifibrotskih citokina poput IL-10, IL-4, IL-22 i interferona gama (IFN-&#x03B3;) koji suprimiraju sazrijevanje Th17, &#x0161;to olak&#x0161;ava razvoj upale i fibroze. Pojednostavljeni patogenetski mehanizam razvoja imunosne disfunkcije prikazan je na slici 2. Upravo je neravnote&#x017E;a Treg/Th17 prepoznata kao &#x010D;imbenik povezan s razvojem multiorganskog zatajenja i ishoda sepse. (<xref ref-type="bibr" rid="r13"><italic>13</italic></xref>, <xref ref-type="bibr" rid="r17"><italic>17</italic></xref>)</p>
<p>Postavlja se pitanje jesu li bolesnici s NAFLD-om podlo&#x017E;niji bakterijskim infekcijama te kakve su posljedice perzistentne upale na sistemski odgovor organizma na infekciju, tijek sepse i njezin ishod. Postoji nekoliko studija koje sugeriraju povezanost poreme&#x0107;aja imunosnog odgovora u bolesnika s NAFLD-om i rizika od razvoja bakterijskih infekcija: (1) pokazano je da zamjenski biomarkeri endotoksemije, serumski protein koji ve&#x017E;e lipopolisaharid i protutijela na endotoksin koreliraju s prisutno&#x0161;&#x0107;u NAFLD-a, fibrozom i progresijom u NASH; (<xref ref-type="bibr" rid="r18"><italic>18</italic></xref>) (2) promjene u razini adiponektina pokazale su se kao mogu&#x0107;i prognosti&#x010D;ki marker ishoda te&#x0161;ke sepse/&#x0161;oka nakon kirur&#x0161;kih zahvata; (<xref ref-type="bibr" rid="r19"><italic>19</italic></xref>) (3) prema genomskom profiliranju, regulacijski molekularni putevi, mikroRNK i duga&#x010D;ke nekodiraju&#x0107;e molekule RNK povezuju sepsu s metaboli&#x010D;kim sindromom. (<xref ref-type="bibr" rid="r20"><italic>20</italic></xref>) Me&#x0111;utim, utjecaj ovih promjena na tijek i klini&#x010D;ki ishod bakterijskih infekcija nije posve jasan (<xref ref-type="fig" rid="f2">Figure 2</xref>).</p>
<fig id="f2" position="float" fig-type="figure"><label>Figure 2</label><caption><p>Mechanism of immune response dysfunction in patients with non-alcoholic fatty liver disease</p></caption><graphic xlink:href="LV-143-220-f2"></graphic></fig>
</sec>
<sec sec-type="other3">
<title>Ishod bakterijskih infekcija u bolesnika s NAFLD-om</title>
<p>Premda su komponente metaboli&#x010D;kog sindroma, &#x0161;e&#x0107;erna bolest i pretilost, povezane s vi&#x0161;im rizikom i mortalitetom kod te&#x0161;kih bakterijskih infekcija, postoji samo nekoliko manjih studija koje su analizirale ulogu NAFLD-a u bakterijskim infekcijama.</p>
<p>U jednoj od prvih studija koja je ciljano istra&#x017E;ivala povezanost NAFLD-a s rekuriraju&#x0107;im bakterijskim infekcijama (rBI), NAFLD je prepoznat kao rizi&#x010D;ni &#x010D;imbenik za njih. (<xref ref-type="bibr" rid="r21"><italic>21</italic></xref>) U prospektivnoj opservacijskoj studiji pra&#x0107;eno je 247 bolesnika s NAFLD-om i 100 bolesnika bez NAFLD-a u periodu od tri godine. (<xref ref-type="bibr" rid="r21"><italic>21</italic></xref>) Naj&#x010D;e&#x0161;&#x0107;i tip rBI bile su infekcije urinarnog trakta, infekcije gornjih i donjih di&#x0161;nih putova. Bolesnici s NAFLD-om imali su zna&#x010D;ajno vi&#x0161;e epizoda rekuriraju&#x0107;ih bakterijskih infekcija od bolesnika bez NAFLD-a (22% naspram 8%; 2,9 naspram 2,2 epizode godi&#x0161;nje). (<xref ref-type="bibr" rid="r21"><italic>21</italic></xref>) U skupini bolesnika s NAFLD-om metaboli&#x010D;ki sindrom nije bio povezan s razvojem rBI, za razliku od stupnja steatoze, niske razine serumskog 25-hidroksi vitamina D i pretilosti (BMI &gt;30 kg/m<sup>2</sup>). (<xref ref-type="bibr" rid="r21"><italic>21</italic></xref>) Razine 25-hidroksi vitamina D u serumu bolesnika s NAFLD-om bile su zna&#x010D;ajnije ni&#x017E;e, bez obzira na dob, spol, BMI i prisutnost metaboli&#x010D;kog sindroma, &#x0161;to je jo&#x0161; izra&#x017E;enije u podskupini s rBI. (<xref ref-type="bibr" rid="r21"><italic>21</italic></xref>)</p>
<p>Ista grupa autora istra&#x017E;ivala je u retrospektivnoj studiji povezanost NAFLD-a s rekuriraju&#x0107;im uroinfekcijama u premenopauzalih &#x017E;ena. (<xref ref-type="bibr" rid="r22"><italic>22</italic></xref>) &#x017D;ene s rekuriraju&#x0107;im uroinfekcijama ve&#x0107;inom su pripadale pretiloj kategoriji te su tako&#x0111;er ustanovljene ni&#x017E;e razine vitamina 25(OH)D3 u serumu od kontrola. Multivarijantnom analizom je pokazano da je NAFLD povezan s razvojem rekuriraju&#x0107;ih uroinfekcija, neovisno o komponentama metaboli&#x010D;kog sindroma. (<xref ref-type="bibr" rid="r22"><italic>22</italic></xref>)</p>
<p>Te&#x0161;ka pneumonija ste&#x010D;ena u op&#x0107;oj populaciji (engl. <italic>community-acquired pneumonia</italic>) i dalje je &#x010D;esti razlog hospitalizacije i naj&#x010D;e&#x0161;&#x0107;i uzrok septi&#x010D;kog &#x0161;oka koji zahtijeva eskalaciju terapije u jedinicama intenzivnog lije&#x010D;enja s mortalitetom izme&#x0111;u 25% i 30%, a koji se nije zna&#x010D;ajno smanjio s vremenom. U nekim je opservacijskim studijama zamije&#x0107;en je tzv. &#x201E;paradoks pretilost &#x2013; pre&#x017E;ivljenje&#x201D; (engl. <italic>obesity survival paradox</italic>) &#x2013; pretili bolesnici imaju vi&#x0161;i rizik za stjecanje pneumonije, ali s ni&#x017E;om smrtno&#x0161;&#x0107;u. (<xref ref-type="bibr" rid="r23"><italic>23</italic></xref>) Me&#x0111;utim, prema retrospektivnoj studiji koja je uklju&#x010D;ila 200 bolesnika s NAFLD-om i 361 ispitanika u kontrolnoj skupini, bolesnici s NAFLD-om su imali zna&#x010D;ajno vi&#x0161;i mortalitet. (<xref ref-type="bibr" rid="r24"><italic>24</italic></xref>) Prosje&#x010D;ni BMI preminulih u NAFLD grupi bio je zna&#x010D;ajno vi&#x0161;i od kontrola, kao i te&#x017E;ina bolesti mjerena bodovnim sustavima CURB-65 i PSI. (<xref ref-type="bibr" rid="r24"><italic>24</italic></xref>) Istra&#x017E;ivanje je pokazalo da je prisutnost NAFLD-a u bolesnika s domicilnom pneumonijom povezana s 30-dnevnom smrtno&#x0161;&#x0107;u, &#x0161;to je koreliralo i sa stadijem fibroze jetre. (<xref ref-type="bibr" rid="r24"><italic>24</italic></xref>) Mogu&#x0107;i patogenetski mehanizam ovih klini&#x010D;kih opa&#x017E;anja dijelom obja&#x0161;njava nedavno opisan mehanizam tzv. &#x201E;osovina plu&#x0107;a &#x2013; jetra&#x201D; (engl. <italic>lung-liver axis</italic>) koji sugerira klju&#x010D;nu ulogu proteina akutne faze sintetiziranih u jetri u modulaciji obrane doma&#x0107;ina i upale plu&#x0107;nog parenhima. (<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>)</p>
<p>Iako postoji obilje podataka o &#x201E;osovini jetra &#x2013; crijevo&#x201D; (engl. <italic>gut-liver axis</italic>) i promjenama u crijevnom mikrobiomu za koje je dokazano da su povezane s NAFLD-om i progresijom u NASH, objavljena je samo jedna studija koja je u kohorti bolesnika s primarnom bakterijemijom gastrointestinalnog ishodi&#x0161;ta pokazala povezanost NAFLD-a s ovim klini&#x010D;kim sindromom (OR = 4.82, 95% CI 4.2&#x2013;5.4). (<xref ref-type="bibr" rid="r26"><italic>26</italic></xref>) Dvije su studije analizirale povezanost NAFLD-a s razvojem infekcije <italic>Clostridiodes difficile</italic> (CDI). U recentno objavljenoj studiji na&#x0161;e grupe CDI je bio zna&#x010D;ajno &#x010D;e&#x0161;&#x0107;i u hospitaliziranih bolesnika lije&#x010D;enih parenteralnom antimikrobnom terapijom koji su imali NAFLD u odnosu na bolesnike bez NAFLD-a (16,87% u odnosu na 7,36%), a to je bilo neovisno o pretilosti i &#x0161;e&#x0107;ernoj bolesti. (<xref ref-type="bibr" rid="r27"><italic>27</italic></xref>) U drugom istra&#x017E;ivanju, NAFLD je ustanovljen u 66% bolesnika s CDI u odnosu na 30,4% u kontrolnoj skupini hospitaliziranoj radi proljeva non-CDI, &#x0161;to ponovno ukazuje prema zna&#x010D;ajnoj povezanosti NAFLD-a i rizika od razvoja CDI. (<xref ref-type="bibr" rid="r28"><italic>28</italic></xref>) Mogu&#x0107;e obja&#x0161;njenje pove&#x0107;anog rizika od CDI u bolesnika s NAFLD-om uklju&#x010D;uje izmjene u mikrobiomu crijeva i poreme&#x0107;aj regulacije biosintetskih putova &#x017E;u&#x010D;nih kiselina, za koje se pokazalo da igraju va&#x017E;nu ulogu u mehanizmu rezistencije na kolonizaciju i klijanje <italic>Cl. difficile</italic>. (<xref ref-type="bibr" rid="r29"><italic>29</italic></xref>, <xref ref-type="bibr" rid="r30"><italic>30</italic></xref>)</p>
<p>Nadalje, va&#x017E;nost NAFLD-a za ishod sepse nagla&#x0161;ena je u na&#x0161;oj kohorti bolesnika sa sepsom uzrokovanom streptokokom grupe B (BHS-B). 43% bolesnika imalo je ultrazvu&#x010D;no dijagnosticiranu steatozu jetre, koja je bila neovisno povezana s mortalitetom za vrijeme hospitalizacije (OR 6.64; 95%CI 1.23-47.88). Bolesnici s NAFLD-om nadalje su imali i u&#x010D;estalije komplikacije, poput nozokomijalnih infekcija i akutne bubre&#x017E;ne insuficijencije.</p>
<p>U bolesnika s cirozom jetre prisutnost steatoze mjerene kontroliranim parametrom atenuacije (CAP) &#x2265; 220 dB/m povezana je s pove&#x0107;anim rizikom od dekompenzacije i razvoja bakterijskih infekcija. (<xref ref-type="bibr" rid="r31"><italic>31</italic></xref>) Pokazano je i da je posttransplantacijski rizik za infekciju zna&#x010D;ajno vi&#x0161;i u bolesnika transplantiranih zbog ciroze NASH u usporedbi s ostalim indikacijama za transplantaciju jetre. (<xref ref-type="bibr" rid="r32"><italic>32</italic></xref>) Polovica smrtnih ishoda u posttransplantacijskom pra&#x0107;enju bila je posljedica infekcije, &#x0161;to je znatno vi&#x0161;e od bolesnika transplantiranih radi drugih indikacija. (<xref ref-type="bibr" rid="r32"><italic>32</italic></xref>)</p>
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<sec sec-type="other4">
<title>Otvorena pitanja</title>
<p>NAFLD i sepsa su trenuta&#x010D;no u fokusu medicinske istra&#x017E;iva&#x010D;ke zajednice. Sepsa je heterogeni sindrom &#x010D;iji je ishod uvjetovan mikrobiolo&#x0161;kim uzro&#x010D;nikom, sijelom infekcije te &#x010D;imbenicima doma&#x0107;ina uklju&#x010D;uju&#x0107;i komorbiditete, genetske &#x010D;imbenike, imunosupresiju te stupanj i tip imunosnog odgovora doma&#x0107;ina. Stoga, unato&#x010D; zna&#x010D;ajnom napretku u razumijevanju patofiziologije sepse, nijedan od istra&#x017E;ivanih novih terapijskih pristupa lije&#x010D;enju sepse nije pokazao benefit u kona&#x010D;nom ishodu lije&#x010D;enja (poput antagonista TLR-4, monoklonalnih protutijela anti-TNF te antagonista TNF i receptora IL-1). Navedeno ukazuje na potrebu za fokusiranjem na specifi&#x010D;ne skupine bolesnika koji bi mogli imati koristi od specifi&#x010D;nih intervencija. Kao &#x0161;to je prethodno opisano, postoje zna&#x010D;ajne korelacije, ali i nepoznanice u na&#x0161;em poznavanju potencijalnih biomarkera te&#x017E;ine sepse, odgovora na terapiju i prognoze kod bolesnika s NAFLD-om. Nadalje, nisu opisani profil i stupanj ekspresije upalnih i protuupalnih medijatora u prisutnosti steatoze jetre u bolesnika s te&#x0161;kim bakterijskim infekcijama. Ove godine zapo&#x010D;et je Uspostavni istra&#x017E;iva&#x010D;ki projekt Hrvatske zaklade za znanost &#x201E;Uloga imunih semaforina u nealkoholnoj masnoj bolesti jetre i sepsi&#x201D; (UIP-2019-04-7194) u kojem &#x0107;e novoosnovana istra&#x017E;iva&#x010D;ka skupina poku&#x0161;ati odgovoriti na dio ovih pitanja. (<xref ref-type="bibr" rid="r33"><italic>33</italic></xref>)</p>
<p>Semaforini su velika obitelj membranskih i solubilnih modifikatora biolo&#x0161;kih odgovora, prisutni u brojnim organskim sustavima, a reguliraju razvoj organa, angiogenezu i onkogenu transformaciju. Recentna istra&#x017E;ivanja opisuju ulogu semaforina u stani&#x010D;noj imunosti i posljedi&#x010D;noj ja&#x010D;ini upalnog odgovora; dok neki suprimiraju aktivaciju i proliferaciju stanica imunosnog sustava i smanjuju produkciju upalnih citokina, drugi pak stimuliraju imunosni odgovor. Prethodno smo pokazali da semaforini imaju ulogu u patogenezi kroni&#x010D;nih virusnih hepatitisa i da serumske koncentracije vi&#x0161;e semaforina koreliraju sa stadijem fibroze u bolesnika s kroni&#x010D;nim hepatitisom C. (<xref ref-type="bibr" rid="r34"><italic>34</italic></xref>, <xref ref-type="bibr" rid="r35"><italic>35</italic></xref>) S obzirom na njihovu klju&#x010D;nu ulogu u regulaciji imunosnog odgovora i njihov terapijski potencijal koji je ve&#x0107; opisan u malignim i autoimunosnim bolestima, istra&#x017E;iva&#x010D;i pretpostavljaju kako bi imuni semaforini mogli biti novi marker za procjenu te&#x017E;ine sepse kod bolesnika s NAFLD-om, &#x0161;to bi moglo dovesti do razvoja novih terapijskih mogu&#x0107;nosti.</p>
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<title>Zaklju&#x010D;ak</title>
<p>NAFLD se danas smatra multisistemskom bolesti koja se sve &#x010D;e&#x0161;&#x0107;e povezuje s rizikom od razvoja i progresije bakterijskih infekcija u sepsu. Poreme&#x0107;aji imunosnog sustava u ovih bolesnika dijelom obja&#x0161;njavaju ova klini&#x010D;ka zapa&#x017E;anja. Te&#x017E;ina i nepovoljan ishod bakterijskih infekcija u ovoj skupini bolesnika nagla&#x0161;ava potrebu za ranim otkrivanjem i mjerama prevencije ovoga rastu&#x0107;eg javnozdravstvenog problema. Bolje razumijevanje mehanizama utjecaja razvijene bolesti masne jetre na imunosni sustav dovelo bi i do razvoja ciljanih terapijskih intervencija.</p>
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<title>Zahvale</title>
<p>U izradi ovog rada sudjelovali su istra&#x017E;iva&#x010D;i Uspostavnoga istra&#x017E;iva&#x010D;kog projekta Hrvatske zaklade za znanost &#x201E;Uloga imunih semaforina u nealkoholnoj masnoj bolesti jetre i sepsi&#x201D; (UIP-2019-04-7194) Anita Atelj, dr. med., Iva Buti&#x0107;, dr. med., Branimir Gjura&#x0161;in, dr. med., Viktor Kotarski, dr. med., dr. sc. Vladimir Krajinovi&#x0107; i doc. dr. sc. Marko Kutle&#x0161;a (Klinika za infektivne bolesti &#x201E;Dr. Fran Mihaljevi&#x0107;&#x201D;).</p>
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<ref-list>
<title>LITERATURA</title>
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