昆虫激素调节控制的研究——保幼激素类似物对合成甘氨酸和丙氨酸有关酶系的调节控制

五龄后期蚕丝腺后部的细胞几乎只合成蚕丝的丝心蛋白。保幼激素类似物(JHA)能增加蚕丝心蛋白的生物合成。家蚕和蓖麻蚕丝心蛋白中,甘氨酸和丙氨酸的含量约占75%。我们用ZR515和ZR777分别处理五龄蚕后,观察到丝腺后部和脂肪体中合成甘氨酸和丙氨酸有关转氨酶的活力均有明显增加。(1)用ZR515处理五龄家蚕后,使五龄期延长1～2天,茧层量增加约10%。蚕丝腺后部的丙氨酸-乙醛酸转氨酶,丙氨酸-酮丙二酸转氨酶,谷丙转氨酶和谷天转氨酶活力,JHA组均比对照组增高约10～40%,脂肪体中这些酶活力也相应地比对照组增高约30%,其中丙氨酸-乙醛酸转氨酶活力增加到165%。酶活力增加的持续时间约3～5天。(2)用ZR777处理五龄蓖麻蚕后,丝腺后部和脂肪体中的谷天转氨酶、异亮氨酸吨-α-酮戊二酸转氨酶和丙氨酸-乙醛酸转氨酶活力,均比对照组高。本文认为JHA对蚕丝腺后部和脂肪体中形成甘氨酸和丙氨酸的转氨酶有明显的调控作用,从而为丝心蛋白的合成提供更多的甘氨酸和丙氨酸。这也许是JHA增丝机制的一个重要方面。     

酵母丙氨酸tRNA的纯化、半分子制备及其末端鉴定

本文报道了用DEAE-葡聚糖凝胶A-25柱层析纯化酵母丙氨酸tRNA的方法,纯化的tRNA,按接受丙氨酸的活力计算,其纯度达60～70%。经核糖核酸酶T_1(RNase T_1)限制性降解(tRNA与RNase T_1的比率为1毫克/15单位,0℃,4分钟),柱层析,制备了tRNA的两个半分子。用萤光标记法,[~3H]标记法,测得5′半分子的3′末端为鸟苷酸;用[~(32)P]标记法测得3′半分子的5′末端为胞苷酸。因此,RNase T_1限制性降解丙氨酸tRNA的切点在反密码子的G—C键之间。     

酵母丙氨酸tRNA的纯化、半分子制备及其末端鉴定

本文报道了用DEAE-葡聚糖凝胶A-25柱层析纯化酵母丙氨酸tRNA 的方法,纯化的tRNA,按接受丙氨酸的活力计算,其纯度达60～70%。经核糖核酸酶T_1(RNase T_1)限制性降解(tRNA 与RNase T_1的比率为1毫克/15单位,0℃,4分钟),柱层析,制备了tRNA 的两个半分子。用萤光标记法,[~3H]标记法,测得5′半分子的3′末端为鸟苷酸;用[~(32)P]标记法测得3′半分子的5′末端为胞苷酸。因此,RNase T_1限制性降解丙氨酸tRNA 的切点在反密码子的G—C 键之间。     

昆虫激素调节控制的研究——保幼激素类似物对合成甘氨酸和丙氨酸有关酶系的调节控制

五龄后期蚕丝腺后部的细胞几乎只合成蚕丝的丝心蛋白。保幼激素类似物(JHA)能增加蚕丝心蛋白的生物合成。家蚕和蓖麻蚕丝心蛋白中,甘氨酸和丙氨酸的含量约占75%。我们用ZR515和ZR777分别处理五龄蚕后,观察到丝腺后部和脂肪体中合成甘氨酸和丙氨酸有关转氨酶的活力均有明显增加。(1)用ZR515处理五龄家蚕后,使五龄期延长1～2天,茧层量增加约10%。蚕丝腺后部的丙氨酸-乙醛酸转氨酶,丙氨酸-酮丙二酸转氨酶,谷丙转氨酶和谷天转氨酶活力,JHA 组均比对照组增高约10～40%,脂肪体中这些酶活力也相应地比对照组增高约30%,其中丙氨酸-乙醛酸转氨酶活力增加到165%。酶活力增加的持续时间约3～5天。(2)用ZR777处理五龄蓖麻蚕后,丝腺后部和脂肪体中的谷天转氨酶、异亮氨酸-α-酮戊二酸转氨酶和丙氨酸-乙醛酸转氨酶活力,均比对照组高。本文认为JHA 对蚕丝腺后部和脂肪体中形成甘氨酸和丙氨酸的转氮酶有明显的调控作用,从而为丝心蛋白的合成提供更多的甘氨酸和丙氨酸。这也许是JHA 增丝机制的一个重要方面。     

丙氨酸转氨酶修饰对大肠杆菌L-色氨酸合成的影响

探究大肠杆菌细胞内负责L-丙氨酸合成的转氨酶对菌株代谢及L-色氨酸合成的影响。运用Red重组技术分别对编码L-丙氨酸转氨酶的基因alaA、alaC和avtA进行敲除。通过摇瓶和50 L罐中探究其对L-色氨酸积累、L-丙氨酸代谢及菌体生长变化情况。结果显示,除3种L-丙氨酸转氨酶全部缺失的工程菌L-丙氨酸合成受阻、菌体生长受到较强抑制外,其它各任意一种或两种丙氨酸转氨酶缺失菌株的生长并未有较大差异,但色氨酸的合成变化显著。其中alaA和alaC双基因缺失的E.coli FS-T4工程菌,摇瓶发酵L-色氨酸产量达6.08 g/L,L-丙氨酸含量仅0.16 g/L,较出发菌株分别提高了26.7%和降低了91.0%。在50 L罐中E.coli FS-T4工程菌L-色氨酸产量最高可达41.9 g/L,糖酸转化率达20.5%,分别较出发菌株提高了13.8%和5.1%。转氨酶AlaA和AlaC的同时缺失,既可以满足细胞整体氨基酸池的需要,而且有利于减少杂酸的积累,使得更多的碳源流向L-色氨酸的合成。     

β-蜕皮素对家蚕丝腺成长及合成甘氨酸、丙氨酸有关酶系的调节控制

本文研究了植源性β-蜕皮素(简称MH)对家蚕丝腺成长及合成甘氨酸、丙氨酸有关酶系的影响,探讨了5龄不同时期添食β-蜕皮素后丝腺体的成长及后部丝腺和脂肪体中丙氨酸-酮丙二酸、丙氨酸-乙醛酸和鸟氨酸转氨酶活力的变化。通过实验观察到:(1)5龄早期(饷食)添食β-蜕皮素,龄期延长8—9小时,茧层量增加,后部丝腺和脂肪体内丙氨酸-酮丙二酸转氨酶、丙氨酸-乙醛酸转氨酶在处理后6-12小时内,比对照组增高40—50%。随之酶活力略下降,至5龄后期复又升高,明显超过对照组。脂肪体中鸟氨酸转氨酶在β-蜕皮素处理后6小时和48小时均低于对照组。12—24小时以及48小时后直至老熟则明显高于对照组。(2)5龄后期(V—136小时)口腔注射β-蜕皮素,龄期缩短12—18小时。脂肪体和丝腺体中丙氨酸-酮丙二酸转氨酶、丙氨酸-乙醛酸转氨酶活力明显高于对照组(一般增高20—40%),老熟时迅速下降。本文对有关保幼激素和β-蜕皮素对5龄家蚕两种靶细胞(丝腺细胞和脂肪细胞)的相互配合和制约以完成对蚕整体的调节控制,以及这两种昆虫激素应用于蚕业生产以控制5龄期的长短和增加蚕丝产量等方面进行了讨论。     

蚕氨基酸代谢之研究 Ⅲ.丝腺体L-天门冬氨酸及α-酮戊二酸形成丙氢酸之机制

研究了家蚕(Bombyx mori L.),天蚕蛾科之蓖麻蚕(Philosama cynthia ricini B.)及柞蚕(Antheraea pernyi G.)丝腺体后部自L-天门冬氨酸与α-酮戊二酸形成丙氨酸的机制。以上各种蚕的丝腺体组织都可利用L-天门冬氨酸与α-酮戊二酸形成丙氨酸,谷氨酸及CO_2。当存在DL-环丝氨酸(10~(-4)M)时,形成较多的谷氨酸与丙酮酸,而丙氨酸之量显著地减少。以L-天门冬氨酸与α-酮戊二酸或以L-谷氨酸与丙酮酸为底物,对丙氨酸之形成具有相同的抑制程度。DL-环丝氨酸(10~(-4))并不抑制谷-天转氨酶与草酰乙酸脱羧酶,但在同样条件下,可显著抑制谷-丙转氨酶的活力(～90%)。此外,若以L-天门冬氨酸或其与小量α-酮戊二酸为底物,尤其是用透析后之酶液,并无显著的丙氨酸与CO_2形成。我们认为,自L-天门冬氨酸与α-酮戊二酸形成之丙氨酸,并非通过Bheemeswar提出的L-天门冬氨酸β-脱羧酶之作用,而是经过三个相继的反应,即在谷-天转氨酶催化下,形成谷氨酸与草酰乙酸,后者除非酶促分解外,在草酰乙酸脱羧酶作用下,形成丙酮酸与CO_2;由以上两反应所形成之谷氨酸与丙酮酸,在蚕丝腺普遍存在的谷-丙转氨酶催化下形成丙氨酸(见图8)。     

林肯链霉菌丙氨酸脱氢酶的纯化和性质

采用硫酸铵分级沉淀、DEAE-纤维素52柱层析、亲和蓝柱层析和琼脂糖凝胶Sepharose6B柱层析的方法,分离纯化了林肯链霉菌丙氨酸脱氢酶,用聚丙烯酰胺凝胶电泳鉴定为单一组分。以凝胶过滤和聚丙烯酰胺梯度凝胶电泳测得该酶的分子量为170000,SDS-聚丙烯酰胺凝胶电泳测得其亚基分子量为42500,表明林肯链霉菌丙氨酸脱氢酶由四个相同的亚基组成。该酶加氨反应最适pH为9．0,脱氨反应最适pH为9．5,加氨反应和脱氨反应的最适温度均为50℃。加氨反应丙氨酸脱氢酶的表现米氏常数km值为：丙酮酸2．08×10－4mol／L,NH4+2．00×10-2mol／L,NADH2．38×10-5mol／L;脱氨反应的Km为：L-Ala1．43×10-2mol／L;NAD+6．67×10-5mol／L。     

三化螟与荔枝蝽体液氨基酸和脂肪体转氨酶与谷氨酸脱氢酶的研究

1.用纸层析的方法测定了水稻、三化螟与荔枝蝽体液的氨基酸含量。2.在三化螟幼虫脂肪体中,观察到谷天转氨酶、谷丙转氨酶与鸟氨酸转氨酶的活力。在荔枝蝽的脂肪体中有11种氨基酸(L-天门冬氨酸、L-丙氨酸、L-异白氨酸、L-白氨酸、L-缬氨酸、L-苯丙氨酸、L-鸟氨酸、L-酪氨酸、L-色氨酸、L-β-丙氨酸与DL-γ-氨基丁酸)可与α-酮戊二酸进行转氨作用,以形成谷氨酸。3.在三化螟与荔枝蝽脂肪体中均存在谷氨酸脱氢酶。     

家蚕后部丝腺GPT的分离纯化与动力学性质

本文用丝腺匀浆抽提液经硫酸铵分级沉淀、ＤＥＡＥ－纤维素柱层析和羟基磷灰石柱层析等步骤分离纯化了家蚕后部丝腺谷丙转氨酶（ＥＣ２．６．１．２,ＧＰＴ）,并研究了它的动力学性质。该酶由两种不同亚基组成,分子量分别是５４０００和２１０００;对丙酮酸、α－酮戊二酸、Ｌ－丙氨酸和Ｌ－谷氨酸的Ｋｍ值分别是２．５×１０－４、４．２×１０－４、９．６×１０－３和１２．５×１０－３ｍｏｌ／Ｌ;最适温度５０℃,最适ｐＨ８．５;Ｋ＋、Ｍｇ２＋和Ｃａ２＋等离子对酶有激活作用,Ｎａ＋、Ｍｎ２＋、Ｃｕ２＋和Ｚｎ３＋等离子对酶有抑制作用;酶的活性中心含有巯基或咪唑基。     

人丙氨酸氨基转移酶同工酶在人体组织中的分布

文中拟通过采用基因重组技术获得ALT1和ALT2同工酶重组蛋白,分别制备筛选出高特异性、高活性的ALT1和ALT2单克隆抗体(ALT1单克隆抗体已成功制备并发表),初步探讨ALT1和ALT2同工酶在人体组织中的定位、分布及表达情况。采用RT-PCR方法从人肝癌细胞(HepG2)中扩增ALT2基因,将成熟的ALT2基因亚克隆至pET32a-ALT2原核表达载体中,并将其连接产物转化至BL21(DE3)感受态细胞中经IPTG诱导表达ALT2蛋白,镍柱(Ni+)亲和层析法纯化ALT2重组蛋白。ALT2重组蛋白免疫Balb/c小鼠,选取阳性血清小鼠脾细胞和骨髓瘤细胞SP2/0进行细胞融合,间接ELISA法挑选阳性细胞株,有限稀释法进行亚克隆,采用亲和层析柱法纯化ALT2抗体。通过RT-PCR和Western blotting方法检测ALT1和ALT2在人体正常组织中的表达和分布,研究结果显示组织中的ALT同工酶基因在mRNA水平和蛋白水平上的表达几乎一致。ALT1在肝脏、肾脏、骨骼肌高表达,胃肠道平滑肌中等表达;ALT2在脂肪、骨骼肌、心肌中高表达,胃肠道平滑肌低表达。免疫组化研究表明,ALT...     

Binding and metabolism of the urinous odorant 5{alpha}-androstan-3-one in sheep olfactory mucosa

The existence of specific receptors for the urinous smellingsteroid 5-androstan-3-one has been investigated in sheep olfactorymucosa using ligand-binding methods. [16,17-³H]5-Androstan-3-one(52.5 Ci/mmol) was synthesized from the precursor 5-androst-16-cn-3-one,which was prepared by two novel methods. A specific bindingcomponent, absent from control tissues was identified. The affinityconstant was 9.6 ± 6.1 x 10⁸ M^-1 (mean ± SD) andcompetition experiments with other compounds indicate high specificity.Binding activity was localized in a high M_r tissue fractionand was distinct from 3-ketosteroid dehydrogenase and otherenzymatic activity.     

The Preparation and Characterization of an Aggregated Gliadin Fraction from Wheat

An aggregated gliadin fraction was prepared by gel filtrationon Sephacryl S300 in a solvent containing 6.0 M guanidine hydrochloride.This was reduced, alkylated, and separated by ion exchange chromatography.SDS-PAGE of the resulting fraction showed a number of polypeptides,mostly with apparent M¹s of around 44 000. The amino acid compositionwas similar to those reported previously for monomeric -, ß-and -gliadins. Automated amino acid sequencing from the N-terminusalso showed the presence of sequence types characteristic of-, ß-, and -gliadins, but the major sequence typewas not related to any described previously. This sequence wasNH₂-Ser-His-Ile-Pro-Gly-Leu-Glu-Arg-Pro-Ser-Gln-Gln-Gln-Gln-Leu-. Key words: Wheat, Gluten, Gliadin, Seed     

Isoforms of alanine aminotransferases in human tissues and serum--differential tissue expression using novel antibodies

Serum alanine aminotransferase (ALT) is used as a clinical marker of hepatotoxicity. Two forms of ALT have been identified, ALT1 and ALT2, encoded by separate genes. The cellular and tissue distribution of the different ALT proteins has not been characterized in humans, and their relative contribution to serum is unknown. Here, we describe the development of novel isoenzyme specific ALT1 and ALT2 antibodies and the expression of the enzymes in human cells and organs. In normal human tissue, high expression of ALT1 was found in liver, skeletal muscle and kidney and low levels in heart muscle and not detectable in pancreas. High ALT2 reactivity was detected in heart and skeletal muscle, while no ALT2 expression was found in liver or kidney. Using immunohistochemistry, strong ALT1 reactivity was found in hepatocytes, renaltubular epithelial cells and in salivary gland epithelial cells, while ALT2 was expressed in adrenal gland cortex, neuronal cell bodies, cardiac myocytes, skeletal muscle fibers and endocrine pancreas. Immunoprecipitation using ALT antibodies on normal human serums showed ALT1 to be mainly responsible for basal ALT activity. Together, the results points to a differential expression of ALT1 and ALT2 in human organs and substantiate a need for investigations regarding the possible impacts on ALT measurements.     

Enzymatic synthesis of isopentenyl pyrophosphate in sweet potato root tissue in response to infection by black rot fungus

Cell-free systems were prepared from fresh, cut and black rot-diseasedtissues of sweet potato roots. When incubated in the presenceof mevalonate, all these systems were capable of synthesizing5-phosphomevalonate, mevalonate-5-pyrophosphate and isopentenylpyrophosphate. The time courses for the appearance of the ¹⁴C-labeledmetabolites suggested the following order of synthesis: mevalonate 5-phosphomevalonate mevalonate-5-pyrophosphate isopentenylpyrophosphate. It was also shown; on prolonged incubation, thatisopentenyl pyrophosphate was converted slowly to isopentenylmonophosphate. The activity for synthesis of isopentenyl pyrophosphatefrom mevalonate was higher in diseased tissue than in cut andhealthy tissues. ¹This paper constitutes Part 78 of the Phytopathological Chemistryof Sweet Potato with Black Rot and Injury. (Received June 18, 1969; )     

载两性霉素B的聚乳酸纳米粒对大鼠血液系统（溶血）及肝肾功能的影响

目的研究携载两性霉素B的聚乳酸纳米粒（AmB-PLA-NP）对大鼠肝、肾及血液系统的影响。方法将大鼠随机分4组,分别经尾静脉注射AmB、AmB-PLA-NP、PLA-NP（聚乳酸纳米粒）及表面活性剂聚山梨酯-80,定时取血检测丙氨酸氨基转移酶（ALT）、天门冬氨酸氨基转移酶（AST）、尿素氮（BUN）、肌酐（Cr）及红细胞（RBC）、血红蛋白（Hb）、白细胞（WBC）、血小板（PLT）等指标。结果AmB组大鼠给药前及给药后1d、1周的RBC分别为（5.84±0.37）×10^12/L、（4.302±0.3）×10^12/L和（3.3±0.37）×10^12/L,AmB-PLA-NP组分别为（6.142±0.55）×10^12/L、（6.38±0.35）×10^12/L和（6.14±0.18）×10^12/L,溶血反应明显降低;AmB组给药后ALT及AST水平显著升高,分别为（1059.2±119.22）μmol/L、（466.6±357.30）μmol/L（给药1d后）和（1755±175.39）μmol/L、（2684.2±494.74）μmol/L（给药1周后）,而AmB-PLA-NP组、PLA组及聚山梨酯-80组的大鼠肝、肾功能未发生明显变化。结论AmB-PLA-NP能够显著降低AmB对肝、肾及血液系统的毒副作用。     

Expression, purification, and initial characterization of human alanine aminotransferase (ALT) isoenzyme 1 and 2 in High-five insect cells

Alanine aminotransferase (ALT) is a key enzyme for gluconeogenesis as well as a widely used serum marker for liver injury. We have identified two ALT isoenzymes, ALT1 and ALT2, which are encoded by separate genes. In this study, we described the expression, purification and initial characterization of human ALT1 and ALT2 proteins in High-five insect cells. Human ALT1 and ALT2 were expressed as His-tagged fusion proteins by recombinant baculovirus in insect cells and purified into homogeneity in one step by using immobilized Ni²⁺-affinity chromatography. Tag-free ALT1 and ALT2 were obtained by cleavage of enterokinase digestion and used for initial characterization of the enzymes. The specific ALT activity of purified fusion or His-tag-removed ALT1 was about 15-fold higher than that of ALT2 and their enzymatic activities decreased quickly at 37 °C and −20 °C, but were well preserved at −80 °C. Nevertheless, the ALT1 and ALT2 activities remained stable in a buffer containing 25% glycerol. The pH profile was similar between hALT1 and hALT2 in that both enzymes remained fully active between pH 6.5 and 8.0. The purified ALT recombinant proteins can not only be used as a reference protein standard for the ALT assay in clinical chemistry, but also will be useful for understanding the biochemical and biological significance of the isoenzymes and for developing ALT isoform-specific assays for clinical or preclinical diagnostic use.     

Loss of Wild-Type ATRX Expression in Somatic Cell Hybrids Segregates with Activation of Alternative Lengthening of Telomeres

Alternative Lengthening of Telomeres (ALT) is a non-telomerase mechanism of telomere lengthening that occurs in about 10% of cancers overall and is particularly common in astrocytic brain tumors and specific types of sarcomas. Somatic cell hybridization analyses have previously shown that normal telomerase-negative fibroblasts and telomerase-positive immortalized cell lines contain repressors of ALT activity, indicating that activation of ALT results from loss of one or more unidentified repressors. More recently, ATRX or DAXX was shown to be mutated both in tumors with telomere lengths suggestive of ALT activity and in ALT cell lines. Here, an ALT cell line was separately fused to each of four telomerase-positive cell lines, and four or five independent hybrid lines from each fusion were examined for expression of ATRX and DAXX and for telomere lengthening mechanism. The hybrid lines expressed either telomerase or ALT, with the other mechanism being repressed. DAXX was expressed normally in all parental cell lines and in all of the hybrids. ATRX was expressed normally in each of the four telomerase-positive parental cell lines and in every telomerase-positive hybrid line, and was abnormal in the ALT parental cells and in all but one of the ALT hybrids. This correlation between ALT activity and loss of ATRX expression is consistent with ATRX being a repressor of ALT.     

Functional Reconstitution of Plasma Membrane H+-ATPase from Mung Bean (Vigna radiata L.) Hypocotyls in Liposomes Prepared with Various Molecular Species of Phospholipids

The activity of solubilized plasma membrane ATPase is affectedby the nature of exogenously added molecular species of phospholipids.To examine the role of the polar head group and of the molecularspecies of phospholipids in H⁺-pumping, the ATPase solubilizedfrom plasma membranes of mung bean (Vigna radiata L.) hypocotylswas reconstituted in liposomes prepared with a variety of phospholipids. The extent of activation of solubilized plasma membrane ATPasedue to the addition of 1-palmitoyl 2-oleoyl-phospholipids (PO-phospholipids)and asolectin decreased in the following order: POPS POPC asolectin POPG > POPE > POPA (see List of Abbreviations). H⁺-pumpinginto proteoliposomes reconstituted with asolectin and plasmamembrane ATPase was demonstrated by quinacrine fluorescencequenching in the presence of ATP-MgSO₄. H⁺-pumping was inhibitedby VO₄ and gramicidin D. When plasma membrane ATPase was reconstitutedin liposomes prepared with various PO-phospholipids, the abilityof PO-phospholipids to support H⁺-pumping into the proteoliposomesdecreased in the following order: POPG POPS > asolectin POPC. POPE and POPA failed to support any H⁺-pumping. A remarkablyhigh rate of H⁺-pumping was observed in proteoliposomes preparedwith 1-saturated 2-unsaturated fatty acids, such as POPC, butH⁺-pumping could hardly be detected in proteoliposomes preparedwith 1-, 2-unsaturated or 1-, 2-saturated fatty acids, suchas PSPC or DLPC. ATPase activity in proteoliposomes was dependenton the species of PO-phospholipids used for reconstitution anddecreased in the following order: POPS > POPG > POPC asolectin > POPA > POPE. DLPC (see List of Abbreviations)which includes a 1-, 2-unsaturated fatty acid supported onlymarkedly depressed activity. Both H⁺-pumping and the hydrolysis of ATP by the plasma membraneATPase are strongly affected by the polar head group and compositionof the fatty acyl chain of phospholipids used to prepare liposomesfor reconstitution of the ATPase. (Received May 31, 1991; Accepted September 18, 1991)     

声触诊组织量化技术（VTQ）测量肝硬度与血清AST/ALT比值评价肝硬化患者严重程度及预后分析

摘要 目的：探讨VTQ测量肝硬度与血清AST/ALT比值对肝硬化患者严重程度及预后的评价价值。方法：回顾性选择2018年1月至2022年10月来我院诊治的肝硬化患者80例,根据Child-Pugh分级将80例患者分为Child-Push A级30例、B级25例、C级25级,根据是否存在并发症将80例患者分为并发症组（45例）与非并发症组（35例）,80例患者均用VTQ法检测VTQ值,检测所有患者的血清ALT、AST水平,计算ALT/AST比值。对比不同Child-Push分级患者不同部位的VTQ值,对比不同Child-Push分级患者的AST、ALT水平及AST/ALT比值,对比有无并发症组的不同部位VTQ值,对比有无并发症组患者的AST、ALT水平及AST/ALT比值,分析80例患者不同部位VTQ值与AST、ALT、AST/ALT比值的相关性。结果：C组患者不同肝脏部位的VTQ值明显较A组及B组高,B组患者不同肝脏部位的VTQ值较A组高（P<0.05）。C组的AST水平、AST/ALT值明显较A组、B组高,B组的AST水平、AST/ALT值明显较A组高（P<0.05）,C组的ALT水平较A组、B组高,B组的ALT水平较A组高,但组间对比无统计学意义（P>0.05）。并发症组不同肝脏部位的VTQ值明显较无并发症组高（P<0.05）。并发症组的AST、AST/ALT比值明显较无并发症组高（P<0.05）,并发症组的ALT较无并发症组高,但组间对比无统计学意义（P>0.05）。80例肝硬化患者的AST、AST/ALT比值与不同部位的VTQ值正相关（P<0.05）,ALT水平与不同部位的VTQ值无相关性（P>0.05）。结论：VTQ测量肝硬度与血清AST/ALT比值可用于评价肝硬化严重程度及预后。