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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" article-type="research-article" dtd-version="1.1" xml:lang="zh" xsi:noNamespaceSchemaLocation="https://jats.nlm.nih.gov/publishing/1.1/xsd/JATS-journalpublishing1.xsd"><front><journal-meta><!-- 出版商赋予期刊ID--><journal-id journal-id-type="publisher-id">YIKE</journal-id><journal-title-group><!-- 期刊中文全称--><journal-title>安徽医科大学学报</journal-title><!-- 期刊英文全称--><journal-title xml:lang="en">Acta Universitatis Medicinalis Anhui</journal-title><!-- 期刊英文缩写--><abbrev-journal-title abbrev-type="publisher" xml:lang="en">Acta Universitatis Medicinalis Anhui</abbrev-journal-title><!-- 期刊中文缩写--><abbrev-journal-title abbrev-type="publisher">安徽医科大学学报</abbrev-journal-title></journal-title-group><!-- 期刊ISSN号--><issn pub-type="ppub">1000-1492</issn><!-- 期刊CN号--><issn pub-type="cn">34-1065/R</issn><publisher><!--出版商英文名称【预置实体】 待确认 --><publisher-name xml:lang="en">Anhui Lianzhong Printing Limited Company</publisher-name><!--出版商英文地址【预置实体】 --><publisher-loc xml:lang="en">Editorial Board of Acta Universitatis Medi-cinalis Anhui Meishan Road , Hefei 230032</publisher-loc><!-- 出版商中文名称【预置实体】--><publisher-name>《安徽医科大学学报》编辑部</publisher-name><!--出版商中文地址【预置实体】 --><publisher-loc>安徽省合肥市安徽医科大学校内老图书馆三楼</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="manuscript">21 V256 张方方-1</article-id><article-id pub-id-type="publisher-id">1000–1492（2026）04–0782–08</article-id><article-id pub-id-type="doi">10.19405/j.cnki.issn1000–1492.2026.04.026</article-id><article-categories><subj-group subj-group-type="clc"><subject>R730.2</subject></subj-group><subj-group subj-group-type="dc"><subject>A</subject></subj-group><subj-group subj-group-type="heading"><subject>综述</subject></subj-group></article-categories><title-group><article-title>SMYD5的生物学功能及其在疾病中的作用</article-title><trans-title-group xml:lang="en"><trans-title>Biological functions of SMYD5 and its role in disease</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name name-style="eastern"><surname>张</surname><given-names>方方</given-names></name><name name-style="eastern" xml:lang="en"><surname>Zhang</surname><given-names>Fangfang</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="author-notes" rid="fna1"/></contrib><contrib contrib-type="author"><name-alternatives><name name-style="eastern"><surname>刘</surname><given-names>皓丹</given-names></name><name name-style="eastern" xml:lang="en"><surname>Liu</surname><given-names>Haodan</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name-alternatives><name name-style="eastern"><surname>杨</surname><given-names>睿睿</given-names></name><name name-style="eastern" xml:lang="en"><surname>Yang</surname><given-names>Ruirui</given-names></name></name-alternatives><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author"><name-alternatives><name name-style="eastern"><surname>李</surname><given-names>萱</given-names></name><name name-style="eastern" xml:lang="en"><surname>Li</surname><given-names>Xuan</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name-alternatives><name name-style="eastern"><surname>王</surname><given-names>长丽</given-names></name><name name-style="eastern" xml:lang="en"><surname>Wang</surname><given-names>Changli</given-names></name></name-alternatives><role>综述</role><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern"><surname>叶</surname><given-names>广彬</given-names></name><name name-style="eastern" xml:lang="en"><surname>Ye</surname><given-names>Guangbin</given-names></name></name-alternatives><xref ref-type="aff" rid="aff2">2</xref><xref ref-type="corresp" rid="cor1"/><xref ref-type="author-notes" rid="fna2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern"><surname>宾</surname><given-names>晓芸</given-names></name><name name-style="eastern" xml:lang="en"><surname>Bin</surname><given-names>Xiaoyun</given-names></name></name-alternatives><role>审校</role><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="author-notes" rid="fna3"/>  <xref ref-type="corresp" rid="cor2"/></contrib><aff-alternatives id="aff1"><aff><label>1</label><institution>右江民族医学院，基础医学院</institution>、，<city>百色</city>  <postal-code>533000</postal-code></aff><aff xml:lang="en"><label>1</label><institution>School of Basic Medical Sciences, Youjiang Medical University  for Nationalities</institution>， <city>Baise</city>     <postal-code>533000</postal-code></aff></aff-alternatives><aff-alternatives id="aff2"><aff><label>2</label><institution>右江民族医学院，生命科学研究院</institution>，<city>百色</city>  <postal-code>533000</postal-code></aff><aff xml:lang="en"><label>2</label><institution>Institute of Life Sciences, Youjiang Medical University  for Nationalities</institution>， <city>Baise</city>     <postal-code>533000</postal-code></aff></aff-alternatives></contrib-group><author-notes><corresp xml:lang="en" id="cor1"><named-content content-type="corresp-name">Ye Guangbin</named-content>， E-mail： <email>ygb9064@126.com</email></corresp>  <corresp xml:lang="en" id="cor2"><named-content content-type="corresp-name">Bin Xiaoyun</named-content>， E-mail： <email>bxy889@163.com</email></corresp><fn fn-type="other" specific-use="about-author" id="fna1"><p><named-content content-type="corresp-name">张方方</named-content>，女，硕士研究生</p></fn><fn fn-type="other" specific-use="about-author" id="fna2"><p><named-content content-type="corresp-name">叶广彬</named-content>，男，博士，实验师，硕士生导师，通信作者，E-mail： <email>ygb9064@126.com</email></p></fn><fn fn-type="other" specific-use="about-author" id="fna3"><p>宾晓芸，女，博士，教授，硕士生导师，通信作者，E-mail： <email>bxy889@163.com</email></p></fn></author-notes><pub-date pub-type="epub" iso-8601-date="2026-03-10T09：04：55"><day>10</day><month>03</month><year>2026</year></pub-date><pub-date pub-type="ppub"><day>23</day><month>04</month><year>2026</year></pub-date><volume>61</volume><issue>4</issue><fpage>782</fpage><lpage>788</lpage><page-range>782-788</page-range>  <history><date date-type="received">        <day>03</day><month>03</month><year>2026</year></date></history><abstract abstract-type="key-points"><p>SMYD5是一种具有SET和MYND结构域的核糖体蛋白甲基转移酶，属于SMYD家族成员，在卵巢和睾丸等多种组织中均有表达。该酶通过核糖体蛋白甲基化修饰参与基因表达调控、细胞发育分化、维持基因组稳定性等生物学过程。近年来，在肝细胞癌、胃腺癌和肺癌等癌症中关于SMYD5的研究逐渐增多。研究表明，SMYD5在肝细胞癌、胃腺癌、肺癌以及炎症性肠病等多种疾病中呈现高水平表达，影响疾病的发生发展进程。本文对SMYD5在肝细胞癌、炎症性肠病等疾病中的作用及其他生物学功能进行综述，旨在为相关疾病研究提供参考。</p></abstract><trans-abstract abstract-type="key-points" xml:lang="en"><p>SMYD5 is a ribosomal methyltransferase with SET and MYND structural domains， which is a member of the SMYD family and is expressed in a variety of tissues， including ovary and testis. This enzyme participates in biological processes such as gene expression regulation， cell development and differentiation， and maintenance of genomic stability through ribosomal protein methylation modification. In recent years， research on SMYD5 has increased in cancers including hepatocellular carcinoma， gastric adenocarcinoma， and lung cancer. Studies have revealed that SMYD5 exhibits high expression levels in various diseases including hepatocellular carcinoma， gastric adenocarcinoma， lung cancer， and inflammatory bowel disease， influencing the progression of these conditions. This review summarizes the role of SMYD5 in hepatocellular carcinoma， inflammatory bowel disease， and other biological functions， aiming to provide a reference for related disease research.</p></trans-abstract><kwd-group kwd-group-type="author"><kwd>SMYD5</kwd><kwd>核糖体甲基转移酶</kwd><kwd>肝细胞癌</kwd><kwd>胃腺癌</kwd><kwd>肺癌</kwd><kwd>炎症性肠病</kwd></kwd-group><kwd-group xml:lang="en" kwd-group-type="author"><kwd>SMYD5</kwd><kwd>ribosomal methyltransferase</kwd><kwd>hepatocellular carcinoma</kwd><kwd>gastric adenocarcinoma</kwd><kwd>lung cancer</kwd><kwd>inflammatory bowel disease</kwd></kwd-group><funding-group><award-group><funding-source>国家自然科学基金项目</funding-source><award-id>82560288</award-id></award-group><award-group><funding-source>广西自然科学基金项目</funding-source><award-id>2024GXNSFAA010120</award-id></award-group><award-group><funding-source>广西研究生教育创新计划项目</funding-source><award-id>JGY2024318</award-id></award-group><award-group><funding-source>2024年百色市科学研究与技术开发计划自筹经费项目</funding-source><award-id>20250320</award-id></award-group><funding-statement>国家自然科学基金项目（编号：82560288）；广西自然科学基金项目（编号：2024GXNSFAA010120）；广西研究生教育创新计划项目（编号：JGY2024318）；2024年百色市科学研究与技术开发计划自筹经费项目（编号：20250320）</funding-statement></funding-group><funding-group xml:lang="en"><award-group><funding-source>Fund programs  National Natural Science Foundation of China</funding-source><award-id>82560288</award-id></award-group><award-group><funding-source>Guangxi Natural Science Foundation</funding-source><award-id>2024GXNSFAA010120</award-id></award-group><award-group><funding-source>Innovation Project of Guangxi Graduate Education</funding-source><award-id>JGY2024318</award-id></award-group><award-group><funding-source>2024 Baise City Self-funded Scientific Research and Technology Development Program</funding-source><award-id>20250320</award-id></award-group><funding-statement>National Natural Science Foundation of China （No. 82560288）； Guangxi Natural Science Foundation （No. 2024GXNSFAA010120）； Innovation Project of Guangxi Graduate Education （No. JGY2024318）； 2024 Baise City Self-funded Scientific Research and Technology Development Program （No. 20250320）</funding-statement></funding-group><counts><fig-count count="1"/><table-count count="1"/><equation-count count="0"/><ref-count count="48"/><page-count count="7"/><word-count count="21219"/></counts><custom-meta-group><custom-meta><meta-name>version</meta-name><meta-value>1.0.0.25070</meta-value></custom-meta><custom-meta><meta-name>structure-time</meta-name><meta-value>2026-05-28T13:06:14</meta-value></custom-meta><custom-meta><meta-name>word-source</meta-name><meta-value>FX</meta-value></custom-meta></custom-meta-group></article-meta></front><body><p>蛋白甲基化修饰能够调控基因表达、信号转导、DNA修复等生物学过程，此修饰可以发生在核糖体蛋白的氨基酸残基上。根据甲基化修饰残基的不同，核糖体蛋白甲基化修饰可分为赖氨酸甲基化修饰、精氨酸甲基化修饰、组氨酸甲基化修饰和蛋白N端甲基化修饰<sup>［<xref ref-type="bibr" rid="R1">1</xref>］</sup>。其中，核糖体蛋白RPL40与RPL29的赖氨酸甲基化修饰研究最为广泛。这些位点的甲基化修饰已被证实参与调控核糖体合成、组装及翻译起始与延伸等关键生物学过程<sup>［<xref ref-type="bibr" rid="R2">2</xref>］</sup>。与此同时，核糖体蛋白甲基化修饰在病理机制中的作用也逐渐成为研究热点，当其发生异常调控时可能会导致肿瘤相关基因表达的激活或沉默，从而驱动肿瘤的发生发展<sup>［<xref ref-type="bibr" rid="R3">3</xref>］</sup>。</p><p>SET和MYND结构域蛋白（ the SET and MYND domain-containing proteins， SMYD） 家族是一类特殊的赖氨酸甲基转移酶。SMYD通过催化蛋白的赖氨酸残基甲基化修饰，在染色质重塑、基因转录调控、细胞增殖与分化等生物学过程中发挥关键作用<sup>［<xref ref-type="bibr" rid="R4">4</xref>］</sup>。至今已发现的SMYD家族有5个成员，即SMYD1~5<sup>［<xref ref-type="bibr" rid="R4">4</xref>］</sup>。其中，SMYD5是一种核糖体甲基转移酶，在调控表观遗传和翻译等过程中具有关键作用。此外，研究表明SMYD5的表达水平变化与肝细胞癌（hepatocellular carcinoma， HCC）<sup>［<xref ref-type="bibr" rid="R5">5</xref>］</sup>、胃腺癌（gastric adenocarcinoma， GAC）<sup>［<xref ref-type="bibr" rid="R6">6</xref>］</sup>、肺癌（lung cancer， LC）<sup>［<xref ref-type="bibr" rid="R7">7</xref>］</sup>等多种疾病进展有关。了解SMYD5生物学功能及其在疾病中的作用，以期为相关疾病的治疗研究提供理论支撑和潜在的干预靶点。</p><sec id="s1"><label>1</label><title>SMYD家族</title><p>在SMYD家族中，SMYD1~4具有组蛋白甲基转移酶活性，而SMYD5则被鉴定为一种核糖体甲基转移酶<sup>［<xref ref-type="bibr" rid="R4">4</xref>， <xref ref-type="bibr" rid="R8">8</xref>］</sup>。SMYD蛋白家族的核心结构特征由高度保守的SET结构域和一个插入其中的MYND锌指结构共同构成<sup>［<xref ref-type="bibr" rid="R9">9</xref>］</sup>。SET结构域通过调控染色质结构和基因表达来影响细胞周期和肿瘤发生，并能通过蛋白质相互作用增强其功能。MYND锌指结构参与多种蛋白质-蛋白质相互作用<sup>［<xref ref-type="bibr" rid="R10">10</xref>–<xref ref-type="bibr" rid="R11">11</xref>］</sup>。虽然SMYD家族成员都具有上述保守结构，但成员之间的结构组成仍存在差异。除了SMYD5外，SMYD1~4均含有一个C末端结构域（CTD）<sup>［<xref ref-type="bibr" rid="R12">12</xref>］</sup>。SMYD1~3虽序列相似却拥有不同的底物结合位点。综上，SET-MYND模块的保守性确保了甲基转移酶活性的基础，而C末端结构域的有无及底物结合口袋的微观差异，则决定了SMYD1~4与SMYD5在底物选择及功能上的分化。</p><p>SMYD家族成员在生理功能和疾病调控中展现出显著的特异性。尽管成员均能甲基化组蛋白和非组蛋白，但由于不同成员对底物的偏好性不同进而介导独特的生物学效应。SMYD1通过甲基化组蛋白和非组蛋白，在转录水平调控靶基因表达<sup>［<xref ref-type="bibr" rid="R9">9</xref>］</sup>。该蛋白特异表达于骨骼肌和心肌细胞，对于胚胎发育具有重要意义。此外，SMYD1在不同肿瘤组织中的表达存在差异，在GAC组织中表达下调而在HCC组织中表达上调，提示其可能具有组织特异性的肿瘤调控功能<sup>［<xref ref-type="bibr" rid="R13">13</xref>］</sup>。SMYD2具有甲基转移酶活性，可同时对组蛋白和非组蛋白进行甲基化修饰，形成复杂的基因表达调控网络，这种广泛的修饰能力使其在肿瘤发生发展、炎症反应和免疫调节等多个病理过程中发挥重要作用<sup>［<xref ref-type="bibr" rid="R14">14</xref>］</sup>。临床研究<sup>［<xref ref-type="bibr" rid="R15">15</xref>］</sup>表明，SMYD2在胃癌、食管癌、头颈癌等多种恶性肿瘤中异常表达，并与肿瘤细胞的增殖、迁移和侵袭能力密切相关。SMYD3通过甲基化修饰，激活多条促癌信号通路，显著增强肿瘤细胞的恶性表型。其在直肠癌、胃癌、肝癌等多种恶性肿瘤组织中的高表达特征，进一步证实了SMYD3在肿瘤发生发展中的关键作用<sup>［<xref ref-type="bibr" rid="R16">16</xref>–<xref ref-type="bibr" rid="R18">18</xref>］</sup>。SMYD4参与心脏发育、肌肉形成和免疫调节等多个生理过程，其重新表达可显著抑制肿瘤细胞的增殖和侵袭能力，在多种肿瘤中发挥保护性作用<sup>［<xref ref-type="bibr" rid="R19">19</xref>–<xref ref-type="bibr" rid="R20">20</xref>］</sup>。以上研究表明，SMYD1~4均与心脏和骨骼肌发育有关。</p><p>与SMYD1~4在心脏/肌肉发育及肿瘤中的双重角色不同，SMYD5的功能研究尚处起步阶段，其在肿瘤与免疫调控中的潜在作用正逐步显现。SMYD5在HCC<sup>［<xref ref-type="bibr" rid="R5">5</xref>］</sup>、GAC<sup>［<xref ref-type="bibr" rid="R6">6</xref>］</sup>、LC<sup>［<xref ref-type="bibr" rid="R7">7</xref>］</sup>组织中呈现高表达，且与患者不良预后显著相关，提示其可能作为促癌因子参与肿瘤进展。此外， 研究发现SMYD5通过结合NCoR复合物，修饰Toll样受体4（TLR4）响应基因的启动子区域，进而调控巨噬细胞的炎症反应<sup>［<xref ref-type="bibr" rid="R21">21</xref>］</sup>。这些发现揭示SMYD5在多种病理生理过程中可能发挥关键调控作用，可为肿瘤及炎症性疾病的诊疗提供新思路。</p></sec><sec id="s2"><label>2</label><title>SMYD5的分子结构及其生物学作用</title><p>SMYD5位于人类第2号染色体2p13.2区域，属于核糖体蛋白甲基转移酶。SMYD5作为SMYD家族中结构最为独特的成员，其分子构象呈现出显著的“螃蟹样”特征。该蛋白由4个保守结构域（SET、MYND、post-SET和SET-I）共同构成“蟹身”主体，并延伸出两条特征性的“蟹腿”结构，包含由C末端多聚谷氨酸序列形成的细长单螺旋结构和由MYND结构域的M-插入以及SET结构域的S-插入共同形成的粗壮结构。这2个插入区域相互聚集形成了一个全新的亚结构域SMI，这一特征性结构为SMYD5所独有<sup>［<xref ref-type="bibr" rid="R22">22</xref>］</sup>。此外，N末端还含有一段预测为线粒体靶向序列的特殊区域。SMYD5核心结构域（SET、MYND、post-SET和SET-I）在脊椎动物中高度保守，保障对核心底物的识别与催化功能稳定传递。而上述这些独特的结构特征使SMYD5在调控基因表达和翻译过程、细胞发育分化与维持基因组稳定性等生物学功能中发挥重要作用。</p><p>SMYD5作为重要的表观遗传调控因子，通过多种分子机制参与基因表达的精确调控。SMYD5与NCoR辅阻遏蛋白复合物结合，催化基因启动子处组蛋白H4第20位赖氨酸残基三甲基化（histone H4 lysine 20 trimethylation，H4K20me3）修饰。该甲基化作为一种抑制标记，限制Toll样受体4靶向炎症基因的表达<sup>［<xref ref-type="bibr" rid="R23">23</xref>］</sup>。在胚胎干细胞（ESC）中，SMYD5通过介导H4K20甲基化修饰，调控异染色质区域的基因表达，对维持ES细胞的自我更新，包括对维持八聚体结合转录因子4的正常表达和分化都至关重要<sup>［<xref ref-type="bibr" rid="R24">24</xref>］</sup>。SMYD5还被鉴定为组蛋白H3的特异性甲基转移酶，能够催化组蛋白H3的赖氨酸36位（histone H3 lysine 36， H3K36）与37位单甲基化修饰<sup>［<xref ref-type="bibr" rid="R25">25</xref>］</sup>。SMYD5可充当低温反应调节剂。它在轻度低温反应中的降解减轻了基因启动子处H3K36三甲基化的形成，允许神经保护基因特异性蛋白1的表达<sup>［<xref ref-type="bibr" rid="R26">26</xref>］</sup>。SMYD5能够被RNA聚合酶Ⅱ特异性招募至基因启动子区域，通过催化H3K36三甲基化修饰直接参与转录起始和延伸过程的调控<sup>［<xref ref-type="bibr" rid="R21">21</xref>］</sup>。此外，SMYD5也参与调控翻译过程。研究<sup>［<xref ref-type="bibr" rid="R7">7</xref>］</sup>表明，SMYD5特异性催化60S核糖体RPL40亚基的赖氨酸22位三甲基化（trimethylated ribosome RPL40 lysine 22， RPL40K22me3），从而促进翻译延伸和蛋白质合成。</p><p>SMYD5在多种细胞发育和分化过程中发挥关键调控作用。在斑马鱼模型中，SMYD5功能缺失导致髓系标记物表达异常升高，表明SMYD5通过表观遗传沉默H4K20me3负调控髓系细胞分化<sup>［<xref ref-type="bibr" rid="R27">27</xref>］</sup>。在ES细胞中，SMYD5水平缺失会显著影响细胞的自我更新能力并导致分化紊乱<sup>［<xref ref-type="bibr" rid="R24">24</xref>］</sup>。并且，SMYD5能够直接与鱼精蛋白相互作用，而后者在精子发生过程中参与染色质浓缩和组蛋白替换，表明SMYD5可能在精子染色质重塑过程中发挥调控功能<sup>［<xref ref-type="bibr" rid="R28">28</xref>］</sup>。此外，研究<sup>［<xref ref-type="bibr" rid="R28">28</xref>］</sup>揭示SMYD5通过H4K20me3依赖的染色质沉默机制维护基因组稳定性。在小鼠胚胎干细胞分化过程中，SMYD5消耗会导致染色体结构异常和细胞转化，显著降低H4K20me3和H3K9me3表达。进一步研究<sup>［<xref ref-type="bibr" rid="R29">29</xref>］</sup>表明，SMYD5缺失引起的基因表达失调与长末端重复序列及内源性逆转录病毒元件的异常激活密切相关。这些结果证实SMYD5通过调节异染色质形成和通过促进H4K20me3标记抑制内源性重复DNA元件，在分化过程中维持ES细胞的基因组稳定性。SMYD5缺失导致斑马鱼胚胎中自发DNA损伤增加，也同样表明其通过H4K20me3维持基因组完整性<sup>［<xref ref-type="bibr" rid="R27">27</xref>］</sup>。</p></sec><sec id="s3"><label>3</label><title>SMYD5在疾病中的研究进展</title><p>SMYD5通过调控多种表观遗传修饰、蛋白翻译过程及信号通路，参与疾病发生发展<sup>［<xref ref-type="bibr" rid="R8">8</xref>， <xref ref-type="bibr" rid="R30">30</xref>］</sup>。近年来的研究揭示了SMYD5在HCC<sup>［<xref ref-type="bibr" rid="R8">8</xref>， <xref ref-type="bibr" rid="R21">21</xref>］</sup>、GAC<sup>［<xref ref-type="bibr" rid="R6">6</xref>］</sup>、LC<sup>［<xref ref-type="bibr" rid="R7">7</xref>］</sup>、炎症性肠病（inflammatory bowel disease， IBD）<sup>［<xref ref-type="bibr" rid="R31">31</xref>］</sup>、类风湿关节炎（rheumatoid arthritis， RA）<sup>［<xref ref-type="bibr" rid="R32">32</xref>］</sup>以及人类免疫缺陷病毒（human immunodeficiency virus， HIV）<sup>［<xref ref-type="bibr" rid="R30">30</xref>］</sup>感染中的关键作用，这为开发靶向SMYD5的治疗策略提供了新方向见<xref ref-type="table" rid="T1">表1</xref>。</p><table-wrap id="T1"><object-id pub-id-type="doi">10.19405/j.cnki.issn1000–1492.2026.04.001.T001</object-id><label>表1</label><caption><p>SMYD5与疾病的相关性</p></caption><abstract abstract-type="caption" xml:lang="en"><label>Tab.1</label><title>Correlation between SMYD5 and diseases</title></abstract><alternatives><table id="Table1"><thead><tr><th align="left" style="border-top:solid;border-bottom:solid;">Disease type</th><th align="center" style="border-top:solid;border-bottom:solid;">Related factors</th><th align="center" style="border-top:solid;border-bottom:solid;">Significance</th><th align="center" style="border-top:solid;border-bottom:solid;">References</th></tr></thead><tbody><tr align="center"><td align="left">HCC</td><td align="left">SMYD5、RPL40K22</td><td align="left">SMYD5 is a potential biomarker for HCC.</td><td align="center">［<xref ref-type="bibr" rid="R8">8</xref>， <xref ref-type="bibr" rid="R21">21</xref>］</td></tr><tr align="center"><td align="left">GAC</td><td align="left">SMYD5、RPL40K22</td><td align="left">High expression of SMYD5 promotes malignant progression in GAC and suggests that targeting SMYD5 could serve as a component of combination therapy.</td><td align="center">［<xref ref-type="bibr" rid="R6">6</xref>］</td></tr><tr align="center"><td align="left">LC</td><td align="left">Key epithelial-mesenchymal transition，Matrix metalloproteinase 9，SH2B adaptor protein 3</td><td align="left">SMYD5 expression influences cell migration and invasion， making it a key factor in liver cancer metastasis.</td><td align="center">［<xref ref-type="bibr" rid="R7">7</xref>］</td></tr><tr align="center"><td align="left">IBD</td><td align="left">SMYD5，peroxisome proliferator-activated receptor-γ coactivator 1-α（PGC-1α）</td><td align="left">SMYD5 may regulate mitochondrial function and intestinal homeostasis.</td><td align="center">［<xref ref-type="bibr" rid="R31">31</xref>］</td></tr><tr align="center"><td align="left">RA</td><td align="left">SMYD5，Forkhead box protein O1（FOXO1），hexokinase 2</td><td align="left">SMYD5 is a novel regulatory factor in RA synovial membrane injury. Targeting SMYD5 may provide a new local treatment approach for RA.</td><td align="center">［<xref ref-type="bibr" rid="R32">32</xref>］</td></tr><tr align="center"><td align="left" style="border-bottom:solid;">HIV</td><td align="left" style="border-bottom:solid;">SMYD5，trans-activator of transcription（Tat），ubiquitin-specific peptidase 11（USP11）</td><td align="left" style="border-bottom:solid;">High expression of SMYD5 promotes HIV transcription， and together with USP11， it may serve as a potentially valuable intervention target for latent-state therapy.</td><td align="center" style="border-bottom:solid;">［<xref ref-type="bibr" rid="R30">30</xref>］</td></tr></tbody></table><graphic specific-use="big" xlink:href="alternativeImage/6AB7F27F-29D5-421f-ADE6-DF94C1D3F1F2-T001.jpg"><?fx-imagestate width="169.79997253" height="67.36633301"?></graphic><graphic specific-use="small" xlink:href="alternativeImage/6AB7F27F-29D5-421f-ADE6-DF94C1D3F1F2-T001c.jpg"><?fx-imagestate width="169.79997253" height="67.36633301"?></graphic></alternatives></table-wrap><sec id="s3a"><label>3.1</label><title>SMYD5与HCC</title><p specific-use="noneIndent">原发性肝癌的致死率在全球癌症中位居第3，是导致癌症相关死亡的主要病因之一<sup>［<xref ref-type="bibr" rid="R33">33</xref>］</sup>。原发性肝癌主要分为HCC、肝内胆管癌以及混合型肝癌，其中HCC占到所有类型肝癌的75%～85%左右<sup>［<xref ref-type="bibr" rid="R34">34</xref>］</sup>。肝癌的主要根治性治疗方法为手术治疗，包括肝切除和肝移植，但即使在单个肿瘤≤ 2 cm的患者中，肝切除术后5年复发率也高达70%<sup>［<xref ref-type="bibr" rid="R35">35</xref>–<xref ref-type="bibr" rid="R36">36</xref>］</sup>。并且，近年来HCC对化学治疗药物的抵抗现象更为普遍，因此，寻找特异的HCC诊断标志物及新的药物治疗靶点对HCC患者至关重要<sup>［<xref ref-type="bibr" rid="R37">37</xref>］</sup>。</p><p>多项研究<sup>［<xref ref-type="bibr" rid="R5">5</xref>，<xref ref-type="bibr" rid="R12">12</xref>］</sup>揭示了SMYD5在HCC发生发展中的关键作用。与正常肝组织相比，HCC组织中SMYD5启动子区域呈现显著的低甲基化状态，这种特性的表观遗传学改变导致SMYD5表达水平显著升高。高表达的SMYD5能够促进肝癌细胞的增殖、迁移和侵袭能力，并且临床数据分析<sup>［<xref ref-type="bibr" rid="R5">5</xref>］</sup>显示SMYD5的高表达与患者不良预后密切相关。此外，当SMYD5表达被抑制时，肝癌细胞对紫杉醇等化疗药物的敏感性明显增强<sup>［<xref ref-type="bibr" rid="R5">5</xref>］</sup>。在此基础上，Miao et al<sup>［<xref ref-type="bibr" rid="R8">8</xref>］</sup>发现SMYD5是一种核糖体甲基转移酶催化RPL40K22me3促进翻译与蛋白的合成。在HCC中，SMYD5和RPL40K22me3均显著上调且与不良预后相关。SMYD5/RPL40K22me3缺失导致核糖体碰撞增加、翻译延伸受阻。其次，靶向抑制SMYD5可协同增强mTOR抑制剂疗效。综上，SMYD5在HCC中的调控过程涉及转录水平和翻译后水平双重机制，促进肿瘤细胞增殖和侵袭，并与患者的预后密切相关。然而，SMYD5作为甲基转移酶的底物谱目前仍存在争议。已有研究证实其主要生理功能是对核糖体蛋白（如RPL40），但亦有报道表明SMYD5在特定条件下可催化组蛋白H3、H4甲基化<sup>［<xref ref-type="bibr" rid="R24">24</xref>–<xref ref-type="bibr" rid="R25">25</xref>］</sup>。上述矛盾性结果提示，SMYD5确切的催化底物谱尚未完全明确，其是否具备组蛋白甲基化修饰能力仍有待进一步探究。目前，SMYD5在HCC中的作用机制尚存争议，主要涉及非组蛋白通路（如RPL40甲基化）与组蛋白修饰通路。进一步明确这两条通路在肝癌进展中的具体作用，将有助于全面理解SMYD5的分子机制，并为靶向治疗提供理论依据。</p></sec><sec id="s3b"><label>3.2</label><title>SMYD5与LC</title><p specific-use="noneIndent">LC是全球癌症首要死因，发病机制复杂使临床治疗难破现有瓶颈，面临严峻挑战。流行病学数据显示，在中国，约90%的LC患者死亡归因于肿瘤远处转移。尽管现有治疗手段包括化疗和靶向治疗能够取得一定进展，但肿瘤微转移和远处转移的防控仍是临床治疗的主要瓶颈<sup>［<xref ref-type="bibr" rid="R38">38</xref>］</sup>。 Tae et al<sup>［<xref ref-type="bibr" rid="R7">7</xref>］</sup>发现SMYD5可能是LC抗转移治疗的潜在靶点。SMYD5在LC中异常高表达，通过调控上皮间质转化关键标志物和基质金属蛋白酶9的表达促进肿瘤转移。敲低SMYD5可逆转上皮间质转化进程，显著抑制肿瘤转移，且与常规化疗联用具有协同增效作用。此外，SMYD5通过维持H4K20me3修饰水平抑制肿瘤抑制因子含SH2结构域的衔接蛋白B3的表达，从而增强LC细胞的迁移侵袭能力。</p></sec><sec id="s3c"><label>3.3</label><title>SMYD5与IBD</title><p specific-use="noneIndent">IBD属于慢性非特异性肠道炎症性疾病，目前其病因尚未明确，感染、自身免疫异常、药物反应等多种因素均可能诱发该疾病。其中溃疡性结肠炎和克罗恩病是最常见的类型<sup>［<xref ref-type="bibr" rid="R39">39</xref>］</sup>。IBD的发病率呈逐年攀升趋势，已成为困扰全球的公共卫生难题<sup>［<xref ref-type="bibr" rid="R40">40</xref>］</sup>。Hou et al<sup>［<xref ref-type="bibr" rid="R31">31</xref>］</sup>研究发现IBD患者肠上皮细胞中SMYD5表达显著上调，且与过氧化物酶体增殖物激活受体-γ共激活因子1-α（peroxisome proliferator-activated receptor-γ coactivator 1-α， PGC-1α）表达呈负相关。SMYD5通过转录后催化赖氨酸223残基处的PGC-1α甲基化，促进PGC-1α泛素化和蛋白酶体降解，进而影响线粒体功能和肠道屏障完整性。肠上皮特异性敲除SMYD5可减轻结肠炎症状，提示SMYD5/PGC-1α轴可能是IBD治疗的潜在靶点。</p></sec><sec id="s3d"><label>3.4</label><title>SMYD5与GAC</title><p specific-use="noneIndent">GAC是全球第五大常见癌症类型，该疾病在亚洲人群中的发病率显著高于其他地区人群，其病死率位居癌症相关死亡原因的第3位<sup>［<xref ref-type="bibr" rid="R41">41</xref>］</sup>。GAC的治疗难度较大，尤其是晚期或转移性病例。目前，手术切除仍是唯一具有治愈潜力的治疗手段，但并非所有患者都适合手术。对于无法进行手术治疗的患者，临床多采用化疗、放疗、靶向治疗及免疫治疗等综合干预方案，然而这些疗法不仅疗效存在局限性，且患者易出现治疗耐药现象<sup>［<xref ref-type="bibr" rid="R42">42</xref>］</sup>。</p><p>Park et al<sup>［<xref ref-type="bibr" rid="R6">6</xref>］</sup>研究发现SMYD5及其催化产物RPL40K22me3在GAC组织中显著过表达，且表达水平与患者不良预后呈明显负相关。研究表明SMYD5通过催化RPL40K22me3修饰增强蛋白翻译，促进肿瘤恶性进展。PI3K/mTOR通路在多种肿瘤中常被异常激活，导致细胞无限增殖、抗凋亡、代谢异常，是肿瘤发生发展的重要驱动因素。靶向抑制SMYD5-RPL40K22me3轴不仅能抑制肿瘤生长，还可显著增强肿瘤对PI3K/mTOR抑制剂的敏感性。综上表明SMYD5在GAC的发病过程中发挥着重要作用，并且与肿瘤的治疗敏感性密切相关，为开发针对GAC的新型靶向治疗策略提供了重要的理论依据和潜在干预靶点。</p></sec><sec id="s3e"><label>3.5</label><title>SMYD5与RA</title><p specific-use="noneIndent">RA是一种慢性进展性系统性自身免疫病，以对称性多关节炎为主要临床表现，典型症状包括晨僵、关节肿胀疼痛及功能障碍<sup>［<xref ref-type="bibr" rid="R43">43</xref>］</sup>。作为高致残性疾病，RA不仅严重影响患者生活质量，其发病还存在显著性别差异。流行病学数据显示，女性患病率为男性的2~3倍，其潜在机制可能与雌激素水平调控及免疫调节基因多态性等因素密切相关<sup>［<xref ref-type="bibr" rid="R44">44</xref>］</sup>。Xiao et al<sup>［<xref ref-type="bibr" rid="R32">32</xref>］</sup>研究发现在RA患者滑膜组织及白细胞介素-1β诱导的成纤维样滑膜细胞（fibroblast-like synoviocyte， FLS）中，SMYD5表达显著升高。SMYD5通过介导Forkhead盒蛋白O1（Forkhead box protein O1， FOXO1）甲基化并增强其泛素化降解，从而加速FLS增殖。同时，SMYD5通过上调己糖激酶2促进糖酵解，激活NF-KB信号通路，加剧FLS炎症反应。在动物实验中，关节内注射AAV-shSMYD5可显著减轻关节肿胀、骨侵蚀及关节炎严重程度。研究表明SMYD5是调控滑膜成纤维细胞稳态和RA发病机制的双重靶点，靶向SMYD5的局部治疗策略可能为RA提供新的治疗方法。见<xref ref-type="fig" rid="F1">图1</xref><sup>［<xref ref-type="bibr" rid="R32">32</xref>］</sup>。</p><fig position="float" id="F1"><object-id pub-id-type="doi">10.19405/j.cnki.issn1000–1492.2026.04.001.F001</object-id><label>图1</label><caption><title>SMYD5在RA的的信号通路示意图</title></caption><abstract abstract-type="caption" xml:lang="en"><label>Fig.1</label><title>Schematic diagram of SMYD5 signaling pathway in RA</title></abstract><alternatives><graphic specific-use="print" xlink:href="media/6AB7F27F-29D5-421f-ADE6-DF94C1D3F1F2-F001.eps" id="Graphic1"><?fx-imagestate width="169.79998779" height="119.17639160"?></graphic><graphic specific-use="big" xlink:href="alternativeImage/6AB7F27F-29D5-421f-ADE6-DF94C1D3F1F2-F001.jpg"><?fx-imagestate width="169.79998779" height="119.17639160"?></graphic><graphic specific-use="small" xlink:href="alternativeImage/6AB7F27F-29D5-421f-ADE6-DF94C1D3F1F2-F001c.jpg"><?fx-imagestate width="169.79998779" height="119.17639160"?></graphic></alternatives></fig></sec><sec id="s3f"><label>3.6</label><title>SMYD5与HIV</title><p specific-use="noneIndent">艾滋病是HIV感染所致的一种慢性传染病，最常见的类型为HIV-1型和HIV-2型，目前国内HIV-1型位于主导地位，具有较高的致死率<sup>［<xref ref-type="bibr" rid="R45">45</xref>–<xref ref-type="bibr" rid="R46">46</xref>］</sup>。相较于HIV-2，HIV-1的毒力和传播能力更高，消耗免疫系统的速度更快<sup>［<xref ref-type="bibr" rid="R47">47</xref>］</sup>。HIV可引发多种机会性感染、肿瘤等疾病，对人体危害大<sup>［<xref ref-type="bibr" rid="R48">48</xref>］</sup>。SMYD5在HIV-1感染进程中发挥着多方面的关键作用。Boehm et al<sup>［<xref ref-type="bibr" rid="R30">30</xref>］</sup>研究揭示SMYD5作为关键宿主因子可通过多种途径促进HIV-1转录。无论是否具有转录反式激活因子（trans-activator of transcription， Tat），SMYD5都可结合HIV-1启动子激活转录。另一途径，Tat通过辅因子泛素特异性蛋白酶11（ubiquitin-specific peptidase 11， USP11）去泛素化来稳定SMYD5蛋白水平。SMYD5反过来又使Tat甲基化，从而可能有助于HIV的转录。此外，SMYD5缺失显著抑制HIV-1转录，提示SMYD5可能通过表观遗传调控参与HIV潜伏感染的维持。</p></sec></sec><sec id="s4"><label>4</label><title>结语</title><p>本文系统总结了SMYD5的结构特征、生物学功能及其在多种疾病中的作用。作为一类甲基转移酶，SMYD5在肿瘤及炎性疾病中普遍高表达，通过调控关键信号通路或与其他分子形成特定调控轴，推动疾病恶性进展。基于其在疾病发生发展中的关键作用，SMYD5不仅可作为诊断与预后标志物，更展现出作为潜在治疗靶点及联合治疗策略优化靶点的应用价值。然而，目前针对SMYD5的特异性干预手段仍十分有限，已报道的抑制剂仅涉及紫杉醇及mTOR抑制剂，尚缺乏高效的靶向策略。此外，SMYD5在疾病进程中的上下游调控网络及其底物谱争议尚待深入阐明。未来研究需在解析上述机制的基础上，结合其结构功能特点，开发基于基因编辑或靶向蛋白降解的新型干预手段，为SMYD5相关疾病的精准诊疗提供理论依据与新策略。</p></sec></body><back><ref-list><title>参考文献</title><ref id="R1"><label>1</label><mixed-citation publication-type="journal" publication-format="print" xml:lang="en"><person-group><name name-style="eastern"><surname>Pang</surname><given-names>C N I</given-names></name>， <name name-style="eastern"><surname>Gasteiger</surname><given-names>E</given-names></name>， <name 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