Prolonged intermittent theta burst stimulation restores the balance between A_(2A)R-and A_(1)R-mediated adenosine signaling in the 6-hydroxidopamine model of Parkinson's disease

An imbalance in adenosine-mediated signaling,particularly the increased A_(2A)R-mediated signaling,plays a role in the pathogenesis of Parkinson's disease.Existing therapeutic approaches fail to alter disease progression,demonstrating the need for novel approaches in PD.Repetitive transcranial magnetic stimulation is a non-invasive approach that has been shown to improve motor and non-motor symptoms of Parkinson's disease.However,the underlying mechanisms of the beneficial effects of repetitive transcranial magnetic stimulation remain unknown.The purpose of this study is to investigate the extent to which the beneficial effects of prolonged intermittent theta burst stimulation in the 6-hydroxydopamine model of experimental parkinsonism are based on modulation of adenosine-mediated signaling.Animals with unilateral 6-hydroxydopamine lesions underwent intermittent theta burst stimulation for 3 weeks and were tested for motor skills using the Rotarod test.Immunoblot,quantitative reverse transcription polymerase chain reaction,immunohistochemistry,and biochemical analysis of components of adenosine-mediated signaling were performed on the synaptosomal fraction of the lesioned caudate putamen.Prolonged intermittent theta burst stimulation improved motor symptoms in 6-hydroxydopamine-lesioned animals.A 6-hydroxydopamine lesion resulted in progressive loss of dopaminergic neurons in the caudate putamen.Treatment with intermittent theta burst stimulation began 7 days after the lesion,coinciding with the onset of motor symptoms.After treatment with prolonged intermittent theta burst stimulation,complete motor recovery was observed.This improvement was accompanied by downregulation of the e N/CD73-A_(2A)R pathway and a return to physiological levels of A_(1)R-adenosine deaminase 1 after 3 weeks of intermittent theta burst stimulation.Our results demonstrated that 6-hydroxydopamine-induced degeneration reduced the expression of A_(1)R and elevated the expression of A_(2A)R.Intermittent theta burst stimulation reversed these effects by restoring the abundances of A_(1)R and A_(2A)R to control levels.The shift in ARs expression likely restored the balance between dopamine-adenosine signaling,ultimately leading to the recovery of motor control.

Electroacupuncture improves neuropathic pain Adenosine, adenosine 5'-triphosphate disodium and their receptors perhaps change simultaneously

Applying a stimulating current to acupoints through acupuncture needles–known as electroacupuncture–has the potential to produce analgesic effects in human subjects and experimental animals. When acupuncture was applied in a rat model, adenosine 5-triphosphate disodium in the extracellular space was broken down into adenosine, which in turn inhibited pain transmission by means of an adenosine A1 receptor-dependent process. Direct injection of an adenosine A1 receptor agonist enhanced the analgesic effect of acupuncture. The analgesic effect of acupuncture appears to be mediated by activation of A1 receptors located on ascending nerves. In neuropathic pain, there is upregulation of P2X purinoceptor 3 （P2X3） receptor expression in dorsal root ganglion neurons. Conversely, the onset of mechanical hyperalgesia was diminished and established hyperalgesia was significantly reversed when P2X3 receptor expression was downregulated. The pathways upon which electroacupuncture appear to act are interwoven with pain pathways, and electroacupuncture stimuli converge with impulses originating from painful areas. Electroacupuncture may act via purinergic A1 and P2X3 receptors simultaneously to induce an analgesic effect on neuropathic pain.

Diabetes and inflammatory diseases:An overview from the perspective of Ca^(2+)/3'-5'-cyclic adenosine monophosphate signaling

A large amount of evidence has supported a clinical link between diabetes and inflammatory diseases,e.g.,cancer,dementia,and hypertension.In addition,it is also suggested that dysregulations related to Ca^(2+)signaling could link these diseases,in addition to 3'-5'-cyclic adenosine monophosphate(cAMP)signaling pathways.Thus,revealing this interplay between diabetes and inflammatory diseases may provide novel insights into the pathogenesis of these diseases.Publications involving signaling pathways related to Ca^(2+)and cAMP,inflammation,diabetes,dementia,cancer,and hypertension(alone or combined)were collected by searching PubMed and EMBASE.Both signaling pathways,Ca^(2+)and cAMP signaling,control the release of neurotransmitters and hormones,in addition to neurodegeneration,and tumor growth.Furthermore,there is a clear relationship between Ca^(2+)signaling,e.g.,increased Ca^(2+)signals,and inflammatory responses.cAMP also regulates pro-and anti-inflammatory responses.Due to the experience of our group in this field,this article discusses the role of Ca^(2+)and cAMP signaling in the correlation between diabetes and inflammatory diseases,including its pharmacological implications.As a novelty,this article also includes:(1)A timeline of the major events in Ca^(2+)/cAMP signaling;and(2)As coronavirus disease 2019(COVID-19)is an emerging and rapidly evolving situation,this article also discusses recent reports on the role of Ca^(2+)channel blockers for preventing Ca^(2+)signaling disruption due to COVID-19,including the correlation between COVID-19 and diabetes.

Suppressing high mobility group box-1 release alleviates morphine tolerance via the adenosine5'-monophosphate-activated protein kinase/heme oxygenase-1 pathway

Opioids,such as morphine,are the most potent drugs used to treat pain.Long-term use results in high tolerance to morphine.High mobility group box-1(HMGB1) has been shown to participate in neuropathic or inflammatory pain,but its role in morphine tolerance is unclear.In this study,we established rat and mouse models of morphine tolerance by intrathecal injection of morphine for 7 consecutive days.We found that morphine induced rat spinal cord neurons to release a large amount of HMGB1.HMGB1 regulated nuclear factor κB p65 phosphorylation and interleukin-1β production by increasing Toll-like receptor 4receptor expression in microglia,thereby inducing morphine tolerance.Glycyrrhizin,an HMGB1 inhibito r,markedly attenuated chronic morphine tole rance in the mouse model.Finally,compound C(adenosine 5’-monophosphate-activated protein kinase inhibitor) and zinc protoporphyrin(heme oxygenase-1 inhibitor)alleviated the morphine-induced release of HMGB1 and reduced nuclear factor κB p65 phosphorylation and interleukin-1β production in a mouse model of morphine tolerance and an SH-SY5Y cell model of morphine tole rance,and alleviated morphine tolerance in the mouse model.These findings suggest that morphine induces HMGB1 release via the adenosine 5’-monophosphate-activated protein kinase/heme oxygenase-1 signaling pathway,and that inhibiting this signaling pathway can effectively reduce morphine tole rance.

In Vitro Functional Study of Rice Adenosine 5'-Phosphosulfate Kinase

Sulfate can be activated by ATP sulfurylase and adenosine 5'-phosphosulfate kinase(APSK) in vivo. Recent studies suggested that APSK in Arabidopsis thaliana regulated the partition between APS reduction and phosphorylation and its activity can be modulated by cellular redox status. In order to study regulation of APSK in rice(Os APSK), Os APSK1 gene was cloned and its activity was analyzed. Os APSK1 C36 and C69 were found to be the conserved counterparts of C86 and C119, which involved in disulfide formation in At APSK. C36A/C69 A Os APSK1 double mutation was made by site directed mutagenesis. Os APSK1 and its mutant were prokaryotically over-expressed and purified, and then assayed for APS phosphorylation activity. Os APSK1 activity was depressed by oxidized glutathione, while the activity of its mutant was not. Further studies in the case that oxidative stress will fluctuate in vivo 3'-phosphoadenosine-5'-phosphosulfate content, and all APSK isoenzymes have similar regulation patterns are necessary to be performed.

Electrochemical Studies of Effect of Eu^(3+) on Adenosine-5′-Diphosphate at Mercury Electrode

The electrochemical behavior of the adenosine5diphosphate(ADP) was studied in 005 molL-1 MES buffer solution(pH 585) at mercury electrode. There are no reduction and oxidation waves for the adenosine5diphosphate in the range of -04-14 V(vs. Ag/AgCl). In a mixture solution of Eu3+ and ADP(Eu3+ADP=14), a reduction peak is obtained at -078 V. Comparing with the cyclic voltammograms of Eu3+ ions under the same experimental conditions, it is found that the complex of Eu3+ADP can be produced in above solutions between Eu3+ion and ADP. The complex is strongly adsorbed at mercury electrode and has the following electrode reaction mechanism: Eu3++ADPEu3+ADP+e-Eu2+-ADP.

The Adenosine Receptor Agonist 5’-N-Ethylcarboxamide-Adenosine Increases Mouse Serum Total Homocysteine Levels, Which Is a Risk Factor for Cardiovascular Diseases

An increase in total homocysteine (Hcy) levels (protein-bound and free Hcy in the serum) has been identified as a risk factor for vascular diseases. Hcy is a product of the methionine cycle and is a precursor of glutathione in the transsulfuration pathway. The methionine cycle mainly occurs in the liver, with Hcy being exported out of the liver and subsequently bound to serum proteins. When the non-specific adenosine receptor agonist 5’-N-ethylcarboxamide-adenosine (NECA;0.1 or 0.3 mg/kg body weight) was intraperitoneally administered to mice that had been fasted for 16 h, total Hcy levels in the serum significantly increased 1 h after its administration. The NECA treatment may have inhibited transsulfuration because glutathione levels were significantly decreased in the liver. After the intraperitoneal administration of a high dose of NECA (0.3 mg/kg body weight), elevations in total Hcy levels in the serum continued for up to 10 h. The mRNA expression of methionine metabolic enzymes in the liver was significantly reduced 6 h after the administration of NECA. NECA-induced elevations in total serum Hcy levels may be maintained in the long term through the attenuated expression of methionine metabolic enzymes.

Changes in Adenosine Metabolism in Asthma. A Study on Adenosine, 5&#39-NT, Adenosine Deaminase and Its Isoenzyme Levels in Serum, Lymphocytes and Erythrocytes

Background: Adenosine deaminase (ADA) and 5'-nucleotidase (5'-NT) play a crucial role in adenosine metabolism in healthy individuals. Adenosine is an inflammatory mediator of asthma. Changes in adenosine metabolism and role of ADA and 5'-NT in regulating adenosine level in asthmatics and correlation of these changes with severity of asthma are not clearly understood. Methods: In this study, we screened 5217 patients, of which 2416 were diagnosed with asthma. Further, of 2416 asthmatics, only 45 patients who strictly fulfilled the selection criteria were enrolled in the study. The patients were classified into mild, moderate and severe persistent groups;each group consisted of fifteen patients. Fifteen healthy subjects served as controls. Adenosine levels and activities of 5'-NT, total ADA, ADA1 and ADA2 in serum, lymphocytes and erythrocytes were determined. The data were analysed statistically and p vice versa.

SYNTHESIS OF ADENOSINE DERIVATIVES WITH CARBOXYALKYL SIDE CHAIN AT 2',3'OR 5'POSITION

Some nucleoside carhoxylic acid derivatives,such as(±)ethyl ester of griseolic acid (4)and 9-(2'-deoxy-2'-(benzyloxycarbonyl)-methylene-β-D-rihohept-2'-enofuranosyluranate)adenine (11),were synthesized.The formation of lactone of 5'-deoxy-adenosineacetic acid(AAA,3)was investigated by using different reagents for lactonization from AAA,but all of the efforts failed, and sone unexpected compounds were obtained.

The Adenosine Receptor Agonist 5’-<i>N</i>-Ethylcarboxamide-Adenosine Increases Glucose 6-Phosphatase Expression and Gluconeogenesis

Intraperitoneal administration of the non-selective adenosine receptor agonist 5’-N-ethylcarboxamide-adenosine (NECA) (0.1 or 0.3 mg/kg) increased fasting serum glucose levels in mice. To clarify the mechanism responsible for this, the expression of liver glucose 6-phosphatase (G6Pase: a gluconeogenic enzyme) was analyzed, and it was found that G6Pase mRNA was increased by NECA treatment. Administration of 0.3 mg/kg NECA resulted in elevated serum glucose levels at 1 h and were further elevated at 6 h. Administration of 0.1 mg/kg NECA increased serum glucose levels at 1 h and had returned to control levels by 6 h. The increase in fasting serum glucose levels induced by NECA are thought to be caused, in part, by elevated G6Pase expression.

Autophagy occurs within an hour of adenosine triphosphate treatment after nerve cell damage:the neuroprotective effects of adenosine triphosphate against apoptosis

After hypoxia, ischemia, or inflammatory injuries to the central nervous system, the damaged cells release a large amount of adenosine triphosphate, which may cause secondary neuronal death. Autophagy is a form of cell death that also has neuroprotective effects. Cell Counting Kit assay, monodansylcadaverine staining, flow cytometry, western blotting, and real-time PCR were used to determine the effects of exogenous adenosine triphosphate treatment at different concentrations （2, 4, 6, 8, 10 mmol/L） over time （1, 2, 3, and 6 hours） on the apoptosis and autophagy of SH-SY5Y cells. High concentrations of extracellular adenosine triphosphate induced autophagy and apoptosis of SH-SYSY cells. The enhanced autophagy first appeared, and peaked at 1 hour after treatment with adenosine triphosphate. Cell apoptosis peaked at 3 hours, and persisted through 6 hours. With prolonged exposure to the adenosine triphosphate treatment, the fraction of apoptotic cells increased. These data suggest that the SH-SY5Y neural cells initiated autophagy against apoptosis within an hour of adenosine triphosphate treatment to protect themselves against injury.

白花蛇舌草提取物通过AMPK/ATG5信号通路对急性胰腺炎大鼠肺损伤的保护作用机制研究

目的:通过5’-单磷酸腺苷活化蛋白激酶(AMPK)/自噬相关蛋白5(ATG5)信号通路,探讨白花蛇舌草提取物减轻急性胰腺炎(AP)大鼠肺损伤的机制。方法:建立AP肺损伤大鼠模型,随机分为模型组、提取物(白花蛇舌草提取物)组、3-MA(自噬抑制剂3-甲基腺嘌呤)组、AICAR(AMPK激活剂)组、提取物+AICAR组,每组15只,另取15只大鼠作为假手术组;ELISA检测血清淀粉酶(AMY)、IL-1β、IL-6、IL-18水平;检测大鼠腹水量及肺湿/干重比(W/D);HE观察胰腺及肺组织病理损伤;Western blot检测溶酶体相关膜蛋白2(LAMP2)、自噬底物p62、IL-1β前体蛋白(pro-IL-1β)、胰蛋白酶原活化肽(TAP)、AMPK、p-AMPK、ATG5、自噬标志物LC3-Ⅱ/Ⅰ、泛素特异性蛋白酶10(UPS10)表达。结果:与假手术组相比,模型组大鼠腹水量、肺W/D、胰腺和肺组织病理损伤评分、血清AMY、IL-1β、IL-6、IL-18水平、胰腺组织p62、TAP、pro-IL-1β表达、肺组织pAMPK/AMPK、ATG5、LC3-Ⅱ/Ⅰ、UPS10、pro-IL-1β表达均升高(P<0.05),胰腺和肺组织LAMP2蛋白表达降低(P<0.05);模型大鼠经白花蛇舌草提取物或自噬抑制剂3-MA干预后,上述指标均得到显著改善(P<0.05),且白花蛇舌草提取物的改善效果优于3-MA(P<0.05);而AMPK激活剂AICAR可削弱白花蛇舌草提取物对AP大鼠肺损伤的改善作用(P<0.05)。结论:白花蛇舌草提取物可通过抑制AMPK/ATG5信号通路减轻炎症反应、降低自噬水平改善AP大鼠肺损伤。

金属有机框架Cu@Sc-MOF纳米酶对5'-三磷酸腺苷的比色/荧光检测

通过溶剂热法制备了一种铜/钪金属有机框架(Cu@Sc-MOF)纳米酶,在H2O2存在下,Cu@Sc-MOF可催化氧化3,3’,5,5’-四甲基联苯胺(TMB)得到蓝色氧化产物oxTMB,并在652 nm处产生特征吸收峰。同样,Cu@Sc-MOF也可氧化邻苯二胺(OPD)生成2-氨基吩嗪(DAP),并在570 nm产生特征荧光发射峰(激发波长为390 nm)。由于5’-三磷酸腺苷(ATP)与Cu2+络合,抑制了Cu@Sc-MOF的催化活性,使得652 nm处的吸光度和570 nm处的荧光强度减弱,基于Cu@Sc-MOF的类过氧化物酶活性,构建了一种用于检测ATP的比色/荧光双模式光谱法。比色和荧光分析法的线性范围分别为2.50~40.00μmol/L和1.00~22.50μmol/L,检出限(LOD)分别为0.60和0.27μmol/L。将上述比色/荧光双模式分析法用于肝癌细胞HepG2细胞裂解液中ATP的检测,加标回收率分别为92.0%~101%和93.2%~97.9%,具有良好的应用前景。

腺苷脱氨酶、5′-核苷酸酶及谷胱甘肽还原酶联合检测在评估乙型肝炎患者肝损伤中的临床价值

[目的]探讨腺苷脱氨酶(ADA)、5′-核苷酸酶(5′-NT)及谷胱甘肽还原酶(GR)联合检测在评估乙型肝炎(CHB)患者肝损伤中的临床价值.[方法]选择2020年1月—2024年6月间就诊的72例CHB患者列入实验组,按照肝损伤不同程度分为轻度组(n=39)、中度组(n=25)、重度组(n=8),另选择同期健康体格检查的72例健康者列入对照组.采集所有研究对象血液样本,检测并比较各组血清ADA、5′-NT、GR水平.[结果]实验组血清ADA、5′-NT、GR水平均明显高于对照组(P<0.05);肝损伤重度组患者的血清ADA、5′-NT、GR水平明显高于中度组、轻度组,中度组血清ADA、5′-NT、GR水平明显高于轻度组,相比较差异均有统计学意义(P<0.05).[结论]血清ADA、5′-NT、GR联合检测可应用于CHB临床辅助诊断及肝损伤程度评估中,为临床诊断与治疗方案制定提供依据.

硫酸铈对5′-腺嘌呤及5′-鸟嘌呤核苷酸的水解断裂的催化作用

本文用核磁共振 (NMR)波谱和化学定磷法研究了 Ce(SO4) 2 对 5′-腺嘌呤核苷酸 (5′- AMP)及5′-鸟嘌呤核苷酸 (5′- GMP)的水解断裂作用。结果表明 :Ce(SO4) 2 在 37℃ ,酸性条件下使 5′- AMP断裂为腺嘌呤核苷 (A)及无机磷 ,使 5′- GMP断裂为鸟嘌呤核苷 (G)及无机磷 ,SO2 -4 浓度及酸强度对 5′- AMP及 5′- GMP的水解断裂程度有很大影响 ,并对其水解断裂机制进行了研究。

肝脏疾病诊断中腺苷脱氨酶、前清蛋白、α-L-岩藻糖苷酶、胆碱脂酶和5′-NT价值的临床评价

目的了解腺苷脱氨酶(ADA)、α-L-岩藻糖苷酶(AFU)、胆碱脂酶、前清蛋白和5′-核苷酸酶(5′-NT)在肝脏疾病诊断中的意义。方法选择332例肝脏疾病患者,其中,急性肝炎150例,重型肝炎25例,肝硬化40例,酒精性肝炎35例,慢性肝炎82例;选择同期90例健康体检者作为对照。采用Bayer ADVIA 2400全自动生化分析仪检测其血清ADA、AFU、前清蛋白、胆碱脂酶和5′-NT,绘制受试者工作特征曲线(ROC)并计算曲线下面积(AUC),评价5项指标在不同肝脏疾病中的诊断意义。结果重型肝炎、肝硬化患者血清ADA、AFU、5′-NT显著增高,前清蛋白、胆碱脂酶显著降低;ADA、AFU、5′-NT的异常值比例分别超过80%、65%、90%。急性肝炎、酒精性肝炎患者血清ADA、AFU、5′-NT轻度升高,前清蛋白、胆碱脂酶轻度下降;急性肝炎患者血清胆碱脂酶、5′-NT的异常值比例分别为80.0%、54.67%。血清前清蛋白、胆碱脂酶的AUC在重型肝炎患者中分别为0.022、0.000,在肝硬化组患者中分别为0.019、0.000;上述两组患者血清ADA、5′-NT的AUC均大于0.950,AFU的AU均大于0.800。在急性肝炎和酒精性肝炎组中,患者血清ADA、5′-NT的AUC均大于0.800,AFU的AUC分别为0.814、0.637。332例患者血清前清蛋白、胆碱脂酶的AUC分别为0.175、0.181,血清ADA、AFU、5′-NT的AUC分别为0.850、0.743、0.714。结论血清ADA、AFU、前清蛋白、胆碱脂酶和5′-NT检测对肝脏疾病的诊断具有重要价值。

ADA、5’-NT、TRF、TBA、LAP和PA在肝病诊断中的临床评价

目的探讨腺苷脱氨酶(ADA)、5’-核苷酸酶(5’-NT)、转铁蛋白(TRF)、总胆汁酸(TBA)、亮氨酸氨基肽酶(LAP)、前白蛋白(PA)6项指标在肝病诊断和治疗中的价值。方法使用日立7600全自动生化分析仪测定41例急性肝炎、78例慢性肝炎、62例肝硬化、50例肝癌患者和53例健康对照者血清的上述6项指标,并对检测结果进行统计学分析。结果与正常对照组相比,急性肝炎组与肝癌组ADA、5’-NT、LAP显著升高(P<0.01),TRF和PA显著降低(P<0.01),TBA升高(P<0.05);慢性肝炎组中ADA、5’-NT、TBA、LAP与正常组相比有显著升高(P<0.01),而TRF、PA显著降低(P<0.01);肝硬化组中ADA、TBA与正常组相比有显著升高(P<0.01),而TRF、PA显著降低(P<0.01),5’-NT升高(P<0.05),但是肝硬化组的LAP与正常组无差异(P>0.05)。急性肝炎组受试者工作特性曲线(ROC)下面积5’-NT最大,慢性肝炎组曲线下面积ADA和PA较大,肝硬化组ADA、TBA和PA曲线下面积较大,肝癌组ADA、5’-NT和PA曲线下面积较大,LAP在慢性肝炎、肝硬化和肝癌组的曲线下面积较小。结论上述六项指标中,ADA和PA对肝病的诊断价值较高,可作为各实验室的常规项目开展,而除LAP外的其他5项指标对肝硬化均有较高临床应用价值。此外,上述6项指标与常规指标联合应用,可对临床医师在诊断、治疗、评估肝功能状况时起到重要的参考作用。

快眼动睡眠剥夺对抑郁模型大鼠下丘脑5-HT和腺苷的影响

目的了解快速眼动睡眠剥夺改善抑郁情绪的可能机制。方法将大鼠分为正常对照组(A组)、抑郁模型组(B组)、抑郁模型+72 h睡眠剥夺组(C组),在建立慢性轻度不可预见性应激的抑郁模型后,采用小平台水环境法对大鼠进行72 h快眼动睡眠剥夺,以强迫游泳实验检测大鼠的不动时间,下丘脑5-HT、腺苷浓度分别用高效液相色谱-荧光检测法和高效液相色谱-紫外检测法进行测定。结果 21 d慢性轻度不可预见性应激后,B组和C组大鼠的强迫游泳不动时间显著延长(P<0.05),快眼动睡眠剥夺后C组大鼠强迫游泳不动时间显著缩短(P<0.01);B组大鼠下丘脑5-HT浓度显著低于A组(P<0.01),C组大鼠下丘脑5-HT浓度显著高于B组(P<0.01);B组大鼠下丘脑腺苷浓度显著低于A组(P<0.05),C组大鼠下丘脑腺苷浓度显著低于B组(P<0.01)。结论快眼动睡眠剥夺可以逆转大鼠的抑郁样行为,并增加大鼠下丘脑5-HT浓度,其可能在睡眠剥夺抗抑郁过程中发挥了重要作用,腺苷可能参与了睡眠剥夺的抗抑郁过程。

外源5′-腺苷酸二钠和5′-鸟苷酸二钠对断奶仔猪生长性能及抗氧化能力的影响

将90头28日龄断奶的"杜×长×大"三元杂交仔猪随机分成3组,每组3个重复,对照组饲喂基础日粮,试验Ⅰ和Ⅱ组饲喂在基础日粮中分别添加0.03%5′-腺苷酸二钠和5′-鸟苷酸二钠的日粮,试验期28 d,测定仔猪生长性能和试验开始后第7、14和28天血清中的超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、总抗氧化能力(T-AOC)和丙二醛(MDA)含量,研究外源5′-腺苷酸二钠和5′-鸟苷酸二钠对断奶仔猪生长性能和抗氧化功能的影响.结果表明,Ⅰ和Ⅱ组仔猪断奶后不同时间血清中的SOD活性呈下降趋势(P>0.05),其中,Ⅰ组仔猪第14天SOD活性显著低于对照组(P<0.05),对其他抗氧化指标没有显著影响(P>0.05),各组仔猪生长性能差异不显著(P>0.05).可见,日粮中分别添加5′-腺苷酸二钠和5′-鸟苷酸二钠对仔猪生长性能均无显著影响,5′-腺苷酸二钠有降低仔猪血清中SOD活性的作用.

稀土元素对5′-腺苷酸和5′-鸟苷酸的催化水解作用

用ＨＰＬＣ法研究了稀土金属离子ＲＥ３＋ （如Ｌａ３＋ ，Ｃｅ３＋ ，Ｎｄ３＋ ，Ｓｍ ３＋ ，Ｅｕ３＋ ）对５′－腺苷一磷酸（５′－ＡＭＰ）和５′－鸟苷一磷酸（５′－ＧＭＰ）的催化水解断裂作用． 结果表明：在温和条件下，稀土金属离子对５′－ＡＭＰ无明显的断裂作用，而Ｃｅ３＋ 对５′－ＧＭＰ有较好的断裂作用，当浓度降至０．０５ｍ ｍ ｏｌ／Ｌ时，Ｅｕ３＋ 对５′－ＧＭＰ也有一定的断裂作用；Ｈ２Ｏ２ 能促进稀土金属离子对５′－ＡＭＰ的水解断裂作用；ｐＨ 对稀土金属离子水解切断５′－ＡＭＰ有影响．