Activation of autophagy by Citri Reticulatae Semen extract ameliorates amyloid-beta-induced cell death and cognition deficits in Alzheimer’s disease

Amyloid-beta-induced neuronal cell death contributes to cognitive decline in Alzheimer’s disease.Citri Reticulatae Semen has diverse beneficial effects on neurodegenerative diseases,including Parkinson’s and Huntington’s diseases,however,the effect of Citri Reticulatae Semen on Alzheimer’s disease remains unelucidated.In the current study,the anti-apoptotic and autophagic roles of Citri Reticulatae Semen extract on amyloid-beta-induced apoptosis in PC12 cells were first investigated.Citri Reticulatae Semen extract protected PC12 cells from amyloid-beta-induced apoptosis by attenuating the Bax/Bcl-2 ratio via activation of autophagy.In addition,Citri Reticulatae Semen extract was confirmed to bind amyloid-beta as revealed by biolayer interferometry in vitro,and suppress amyloid-beta-induced pathology such as paralysis,in a transgenic Caenorhabditis elegans in vivo model.Moreover,genetically defective Caenorhabditis elegans further confirmed that the neuroprotective effect of Citri Reticulatae Semen extract was autophagy-dependent.Most importantly,Citri Reticulatae Semen extract was confirmed to improve cognitive impairment,neuronal injury and amyloid-beta burden in 3×Tg Alzheimer’s disease mice.As revealed by both in vitro and in vivo models,these results suggest that Citri Reticulatae Semen extract is a potential natural therapeutic agent for Alzheimer’s disease via its neuroprotective autophagic effects.

Exploring the relationship between ambient sulfur dioxide and semen quality parameters:A systematic review and meta-analysis

Objective:To investigate the relationship between ambient sulfur dioxide(SO2)exposure and semen quality parameters.Methods:A systematic literature search was conducted to identify relevant studies investigating the association between SO2 exposure and semen quality parameters.This search encompassed the timeframe from January 2000 to May 2023 and included electronic databases such as Web of Science,Google Scholar,PubMed,Cochrane,and Scopus.Pooled effect estimates with 95%confidence intervals(CI)were calculated using percent changes(PC).The meta-analysis included seven studies with 6711 participants and 15087 semen samples.Results:The results revealed a significant negative association between ambient SO2 exposure and certain semen quality parameters.In particular,SO2 exposure was associated with a significant decrease in progressive motility(PC=0.032;95%CI:-0.063 to-0.001;P=0.044)and sperm concentration(PC=-0.020;95%CI:-0.036 to-0.005;P=0.012).However,no statistically significant associations were observed for total sperm count(PC=-0.038;95%CI:-0.079 to 0.003;P=0.070),seminal fluid volume(PC=-0.009;95%CI:-0.048 to-0.030;P=0.662)and sperm motility(PC=-0.17;95%CI:-0.363 to 0.022;P=0.830).In addition,the results of the subgroup analysis revealed specific variables that were associated with the decrease in relevant sperm parameters.Conclusions:This systematic review and meta-analysis provides compelling evidence supporting a consistent negative association between exposure to ambient SO2 and semen quality parameters.

Adding chitosan nanoparticles of green tea extract in diluent and thawing temperatures ameliorate the post-thawed quality of Boer buck semen

Objective:To improve the quality of post-thawing Boer buck semen for artificial insemination by adding green tea extract chitosan nanoparticles to skimmed egg yolk diluent,and the proper thawing temperature.Methods:The ejaculate of Boer buck was added to skimmed egg yolk diluent without(the control group)and with adding 1μg of chitosan nanoparticles of green tea extract per mL of diluent(the treatment group).Then,the diluted semen was filled in French mini straws containing 60×106 live sperm per straw,frozen in a standard protocol,and stored as frozen semen at−196℃for a week.Six replicates from each group were diluted for 30 s at 37℃or 39℃sterile water to evaluate the semen quality.Results:Post-thawing(at 37℃or 39℃)of live sperm,progressive motility,and plasma membrane integrity were lower compared to those of the pre-freezing stage(P<0.05).Thawing at 37℃resulted in no significant difference in live sperm,progressive motility,and plasma membrane between the control group and the treatment group(P>0.05).The live sperm,progressive motility,and plasma membrane of the treatment group in the pre-freezing stage,and post-thawed at 39℃were higher compared to those of the control group(P<0.05).There was no significant difference in malondialdehyde(MDA)concentration,DNA fragmentation,and catalase concentration of thawing at 37℃compared to those of 39℃in the same group.The MDA concentration and DNA fragmentation in thawing at 37℃and 39℃of the treatment group were significantly lower than those of the control group(P<0.05).However,the catalase concentration in thawing at 37℃and 39℃of the treatment group was not significantly different than the control group(P>0.05).Conclusions:Higher quality post-thawing Boer buck semen is achieved by adding 1μg/mL of chitosan nanoparticles of green tea extract to the skimmed egg yolk diluent and thawing at 39℃.

Corrigendum: Activation of autophagy by Citri Reticulatae Semen extract ameliorates amyloid-beta-induced cell death and cognition deficits in Alzheimer’s disease

In the article titled“Activation of autophagy by Citri Reticulatae Semen extract ameliorates amyloid-beta-induced cell death and cognition deficits in Alzheimer’s disease”published on pages 2467-2479,Issue 11,Volume 19 of Neural Regeneration Research(Tang et al.,2024),there are some errors in selecting the appropriate images in Figure 7 by authors during assembling the images.

Patterns of alteration in boar semen quality from 9 to 37 months old and improvement by protocatechuic acid

Background Comprehending the patterns of alteration in boar semen quality and identifying effective nutritional interventions are crucial for enhancing the productivity of commercial pig systems.This study aimed to examine the alteration in semen quality in boars,and assess the impact of protocatechuic acid(PCA)on semen quality during the phase of declining semen quality.Methods In Exp.1,a total of 38 Pig Improvement Company(PIC)boars were selected and their semen quality data were recorded from the age of 9 to 37 months.In Exp.2,18 PIC boars(28 months old)were randomly assigned into three groups(n=6)and fed a basal diet,a basal diet containing 500 or 1,000 mg/kg PCA,respectively.The experiment lasted for 12 weeks.Results The semen volume,concentration,and total number of spermatozoa in boars exhibited an increase from 9 to 19 months old and showed a significant linear decreased trend in 28,24,and 22 months old.Sperm motility displayed an upward trajectory,reaching its peak at 20 months of age,and showed a significant linear decreased trend at 20 months old.Dietary supplementation of PCA demonstrated an effect to mitigate the decrease in semen volume,concentration of spermatozoa,total number of spermatozoa(P>0.05),and significantly increased the sperm motility(P<0.05).Moreover,supplementation of 1,000 mg/kg PCA significantly increased the sperm viability(P<0.05).Analysis on cellular signaling pathways revealed that PCA restored serum testosterone levels and alleviated oxidative damage by upregulating the expression of HO-1,SOD2,and NQO1 in testicular stromal cells.Notably,PCA can enhance phosphorylation by selectively binding to AMP-activated protein kinase(AMPK)protein,thereby improving sperm mitochondrial function and augmenting sperm motility via PGC-1/Nrf1.Conclusions These data elucidated the pattern of semen quality variation in boars within the age range of 9 to 37 months old,and PCA has the potential to be a natural antioxidant to enhance sperm quality through modulation of the AMPK/PGC-1/Nrf1 signaling pathway.

Source and level of dietary iron influence semen quality by affecting inflammation, oxidative stress and iron utilization levels in boars

Background Boars fed a mixed form of inorganic and organic iron in excess of the NRC recommended levels still develop anemia,which suggested that the current level and form of iron supplementation in boar diets may be inappropriate.Therefore,56 healthy Topeka E line boars aged 15–21 months were randomly divided into 5 groups:basal diet supplemented with 96 mg/kg ferrous sulfate(FeSO_(4))and 54 mg/kg glycine chelated iron(Gly-Fe,control);80 mg/kg or 115 mg/kg Gly-Fe;80 mg/kg or 115 mg/kg methionine hydroxyl analogue chelated iron(MHA-Fe,from CalimetFe)for 16 weeks.The effects of dietary iron supplementation with different sources and levels on semen quality in boars were investigated.Results 1)Serum Fe and hemoglobin concentrations were not affected by reduced dietary iron levels in the 80 mg/kg or 115 mg/kg Gly-Fe and MHA-Fe groups compared with the control group(P>0.05).2)Serum interleukin-6(IL-6)and sperm malondialdehyde(MDA)levels in the 80 mg/kg or 115 mg/kg MHA-Fe groups were lower than those in the control group(P<0.05),and higher serum superoxide dismutase levels and lower MDA levels in the 115 mg/kg MHA-Fe group(P<0.05).3)Boars in the 80 mg/kg or 115 mg/kg Gly-Fe and MHA-Fe groups had lower serum hepcidin(P<0.01),ferritin(P<0.05),and transferrin receptor(P<0.01)concentrations,and boars in the 115 mg/kg MHA-Fe group had higher seminal plasma Fe concentrations compared with the control group.4)Boars in the 80 mg/kg and 115 mg/kg MHA-Fe groups had lower abnormal sperm rate and in situ oscillating sperm ratio compared to the control group at weeks 12 and/or 16 of the trial.However,the effect of Gly-Fe on improving semen quality in boars was not evident.5)Serum IL-6 level was positively correlated with hepcidin concentration(P<0.05),which in turn was significantly positively correlated with abnormal sperm rate(P<0.05).Furthermore,significant correlations were also found between indicators of iron status and oxidative stress and semen quality parameters.Conclusions Dietary supplementation with 80 mg/kg or 115 mg/kg MHA-Fe did not induce iron deficiency,but rather reduced serum inflammatory levels and hepcidin concentration,alleviated oxidative stress,increased body iron utilization,and improved semen quality in adult boars.

The Effects of Age and Ejaculatory Abstinence on Semen Quality and Reproductive Hormones in Africa and the Middle East

The aim of this study was to retrospectively evaluate the effects of male age and ejaculatory abstinence on semen parameters and reproductive hormones among men residing in Africa and the Middle East. A total of 70,142 semen analysis results were analysed and grouped according to the age intervals (16 - 20, 21 - 30, 31 - 40, 41 - 50, 51 - 60, >60) and ejaculatory abstinence (<2 days, 2 - 5 days and >5 days). Semen parameters i.e. volume, concentration, progressive motility, total progressively motile count, morphology, total normal sperm count, DNA fragmentation, viability, sORP, normed sORP were specifically evaluated. Additionally, for each age interval, reproductive hormones i.e. estradiol, luteinizing hormone, follicle stimulating hormone, testosterone and prolactin were evaluated. Semen volume, total progressively motile count, sperm morphology and total normal sperm count constantly decrease significantly after the age of 30 years. Sperm concentration started declining significantly after the age of 50 years. There was a constant age- related increase in number of spermatozoa with damaged DNA. sORP constantly increased up to 60 years. Furthermore, constantage-related decreases in FSH, serum testosterone and prolact in were observed from patients aged between 16 years and 60 years. Semen volume, sperm concentration, progressive motility and normal morphology were significantly higher in patients having > 5 days of abstinence. Patients having > 5 days of abstinence had the lowest normed sORP. Male age significantly affects sperm parameters and reproductive hormones in fertile and infertile men residing in Africa and the Middle East. Prolonged abstinence days provides better semen quality.

Effect of Moringa oleifera on semen quality profiles in endangered Teressa goat under tropical humid island ecosystem

Objective:To investigate the effect of Moringa oleifera leaf extract on semen quality parameters in Teressa goat buck.Methods:A total of 25 semen samples from six bucks were selected for the study.Spermatozoa of 150×10^(6) were incubated in 0,300,500 and 700μg of leaf extract as groupⅠ,Ⅱ,Ⅲ and Ⅳ,respectively.Liquid stored semen samples were analysed for motility,viability,total sperm abnormalities,plasma membrane,acrosomal and nuclear integrities,seminal plasma intracellular enzymes[aspartate aminotransferase(AST),alanine aminotransferase(ALT)and lactate dehydrogenase(LDH)]and total antioxidant capacity(TAC)and spermatozoa malondialdehyde(MDA)and cholesterol efflux in comparison with the control group(groupⅠ)for up to 72 h.Results:Moringa oleifera leaf extract(500μg/150×10^(6) spermatozoa)-treated semen had significantly higher motility,viability,plasma membrane,acrosomal and nuclear integrities,and TAC(P<0.05),and had significantly lower total sperm abnormalities,AST,ALT,LDH,MDA production and cholesterol efflux compared to those in other Moringa oleifera leaf extract treated(300 or 700μg/150×10^(6) spermatozoa)and control groups at different hours of liquid storage(P<0.05).Semen quality parameters and TAC showed an increasing trend and total sperm abnormalities,MDA production,leakage of intra-cellular enzymes and cholesterol efflux showed a decreasing trend from group Ⅰto group Ⅲand then an opposite trend from group Ⅲ to group Ⅳ at different hours of liquid storage.Conclusions:Moringa oleifera leaf extract 500μg/150×10^(6) spermatozoa can be used for liquid semen preservation in Teressa goat at Andaman and Nicobar Islands.

Study on the Quality of Boar Semen in Kandal Province,Cambodia

In pig production,the selection of parent stock with high capacity and quality is a very important factor in order to obtain high-yield offspring.Therefore,a“study on the quality of boar semen in Kandal province”was conducted for the purpose of comparing and evaluating the quality of boar semen(VAC:Volume Activity Concentration)between Duroc breeds,Yorkshire breeds and Landrace breeds.The study was carried out according to an observation study by selecting three breeds of boars around 3 years old,including two Duroc,two Yorkshire and two Landrace.Each boar was observed in three months,three times a month,and the interval was three to four days.The study took place in Takhmao City,Kandal Province,Cambodia.The results showed that the semen volume per ejaculate per head obtained from Yorkshire boar was an average of 250±76.16 mL,which was higher than the semen volume of Landrace with an average of 173.33±59.73 mL.And the semen volume of Duroc was an average of 149.44±72.70 mL.This value indicates that the semen volume per ejaculate per head was significantly different(p<0.01).The activity or mobility of spermatozoa in the semen between the three breeds differed with slightly significant difference(p<0.05),with the spermatozoa scored from the Yorkshire being 0.76±0.06,Landrace being 0.79±0.05 and Duroc being 0.83±0.03.The semen concentration showed that the Yorkshire had an average spermatozoa concentration of 568.89×10^(6) sperm cells/mL,and the Landrace had an average spermatozoa concentration of 321.11×10^(6) sperm cells/mL and the Duroc an average spermatozoa concentration of 568.86×10^(6) sperm cells/mL,which further confirmed that there was a significant difference in the statistical meaning(p<0.001).The semen quality(VAC)per one ejaculate between the three breeds showed significant difference(p<0.05),in which the VAC of the Yorkshire was 39.31×10^(9) sperms per ejaculate,Landrace was 44.54×10^(9) sperm cells per ejaculate and Duroc was 70.28×10^(9) sperm cells per ejaculate.Based on the above results,we can conclude that the semen quality(VAC)values of the three breeds of pigs are good,which can save the breeding because it shows the excellent quality of each breed.

Study on the regulatory effect of liver X receptor in HEK293 cells by six main diterpene esters in Semen Euphorbiae

Background:To study the effects of the main diterpene esters in Euphorbia factor L_(1),L_(2),L_(3),L_(7a),L_(7b)and L_(8)on the transcriptional activity and protein expression of liver X receptor(LXR).Methods:The effect of the main diterpene ester components in Semen Euphorbiae on the viability of HEK293 cells were studied by MTT assay.The LXR-Luc plasmid vector was transfected into HEK293 cells and treated with Euphorbia factor L_(1),L_(2),L_(3),L_(7a),L_(7b)and L_(8)for 24 h.The effect of the main diterpene ester components of Semen Euphorbiae on LXR-Luc luciferase activity was investigated by dual luciferase reporter gene system,and the expression of LXRαprotein was detected by Western Blot.Results:Euphorbia factor L_(1),L_(2),L_(3),L_(7a),L_(7b)and L_(8)could significantly reduce the relative luciferase activity(RLU)of LXRα,and the expression level of LXRαprotein was significantly down-regulated.Conclusion:Euphorbia factor L_(1),L_(2),L_(3),L_(7a),L_(7b)and L_(8)can inhibit the expression of LXR protein level,which may be achieved by inhibiting the transcriptional activity of LXR.

Impact of chronological ageing on semen parameters in southern Indian men visiting infertility centre:A retrospective study

Objective:To investigate the association between age and semen parameters among male partners of subfertile couples.Methods:This retrospective study analyzed the semen of 1523 infertile men aged 26 to 50 years.Data were extracted from GarbhaGudi IVF Centre database from January 2019 to September 2020.The basic semen parameters were interpreted according to the WHO manual 2021,6th edition.Semen parameters in different age groups were compared.Results:Total and progressive motile sperms were significantly higher in the age group of 26-30 years compared to other age groups(P<0.05).Normal sperm count was significantly higher in the age group of 26-30 years compared to the age groups of 41-45 years and>46 years(P=0.001).However,sperm head defects,neck and midpiece defects,tail defects,and cytoplasmic droplets showed statistically insignificant difference in all the age groups(P>0.05).Semen viscosity showed no statistical difference in all the age groups compared to the reference age group of 26 to 30 years.Conclusions:Higher age can lead to a significant decrease in normal sperms and motility in subfertile men.Hence,male partner age should be considered as one of the major determining factors for reproductive outcomes.

Methanolic pomegranate dried peel extract improves cryopreserved semen quality and antioxidant capacity of rams

Objective:To select the appropriate concentrations of methanolic pomegranate extract supplemented in rams’semen extender for obtaining the best-cryopreserved semen quality.Methods:Tris-based semen extender was supplemented with 0.0,0.40,0.48,and 0.56 mg/mL pomegranate peel methanolic extract to extend semen collected from five native rams twice weekly for two months(n=80).Pooled(n=16)post-thaw semen characteristics were determined.Thawed seminal plasma of all supplemented and control groups were used to measure malondialdehyde(MDA),nitric oxide(NO),glutathione peroxidase(GPx),superoxide dismutase(SOD),ascorbic acid,zinc,copper,total cholesterol,low-density lipoproteins(LDL),lactate dehydrogenase(LDH),and alkaline phosphatase(ALP).Results:The supplementation of Tris-based semen extender with 0.48 mg/mL semen extender resulted in the highest post-thaw sperm total motility(P<0.001),sperm progressive motility(P<0.001),live sperm(P<0.001),sperm plasma membrane integrity(P<0.001),acrosome integrity(P<0.001),SOD(P<0.05),zinc(P<0.001),total cholesterol(P<0.001),and LDL(P<0.001)with the lowest percentage of abnormal sperm morphology(P<0.001),the lowest lipid peroxidation(MDA,P<0.01),ascorbic acid(P>0.05),and LDH(P>0.05).Conclusions:Pomegranate peel methanolic extract 0.48 mg/mL supplemented to Tris-based semen extender of rams is the best enrichment in preserving the sperm post-thaw characteristics via improving biochemical profiles and antioxidant capacity.

Buffalo anti-PDC-109 antibodies improve the semen quality profiles and in-vitro zona binding index and minimize the cryoinjury of sperm in cryopreserved buffalo semen

Objective:To optimize the concentration of PDC-109 protein in semen for higher cryopreservability and fertility by sequestration or neutralization of PDC-109 by its antibodies(anti-PDC-109 antibodies)in bubaline species.Methods:PDC-109 protein was purified by applying two-step chromatography procedures.Purified protein was injected in rabbits to raise antibodies.These raised anti-PDC-109 antibodies were used in neutralization or sequestration of PDC-109 in in-vitro model.Ejaculates were collected from buffaloes and splited for four groups.Group 1 received egg yolk Tris glycerol extender,without anti-PDC-109 antibodies,while group 2 to 4 received anti-PDC-109 antibodies 266μg/mL,80μg/mL,and 26μg/mL in Tris-fructose-citrate buffer,respectively.Semen quality parameters viz.,forward progressive motility,viability,total morphological abnormality,acrosomal integrity,plasma membrane integrity,cryoinjury and in-vitro zona binding index were evaluated.Results:Semen quality parameters of neat semen were within the normal range of bubaline species.Sperm motility,livability,acrosomal integrity,plasma membrane integrity,and cholesterol content of sperm were decreased and total sperm abnormality was increased significantly in post-thaw semen compared to those in pre-freeze and fresh semen(P<0.05).Semen in group 2 had higher sperm motility,livability,acrosomal integrity,plasma membrane integrity,and cholesterol content of sperm and lower total sperm abnormality significantly compared to those in group 1,3 and 4 at pre-freeze and post-thaw stages(P<0.05).Conclusions:Sequestration or neutralization of PDC-109 by its antibodies significantly improves pre-freeze,and post-thaw semen quality parameters and in-vitro zona binding index with simultaneously reducing cryoinjury or cryodamage in the sperm of bubaline species.

Seasonal stress on semen quality profiles, seminal biochemical and oxidative stress attributes in endangered Teressa goat of Andaman and Nicobar Islands

Objective:To measure seasonal effects on semen quality profiles,seminal biochemical and oxidative stress attributes in fresh and liquid stored semen in monsoon and dry seasons.Methods:A total of 10 Teressa bucks(3-4 years)were selected from breeding farm,ICAR-Central Island Agricultural Research Institute,Port Blair,Andaman and Nicobar Islands,India.Semen samples(n=25 per season)were collected through artificial vagina method and preserved at refrigerated temperature(5℃)for 48 h using Tris citrate glucose based extender.We detected semen quality parameters[volume,mass activity,pH,sperm concentration,total motility,viability,total sperm abnormality,and plasma membrane,acrosomal and nuclear integrities],biochemical profiles[aspartate amino transferase(AST),alanine amino transferase(ALT)and total cholesterol],and oxidative stress markers[total antioxidant capacity(TAC)and malondialdehyde(MDA)]during monsoon and dry seasons.Results:Semen quality parameters significantly differed between seasons(P<0.05)and among storage periods(P<0.05).Volume,pH,mass activity,motility,viability,acrosomal,plasma membrane and nuclear integrities,and TAC were significantly higher(P<0.05).Sperm concentration,sperm abnormalities,MDA,AST,ALT and total cholesterol were significantly lower in fresh semen of monsoon than dry season(P<0.05).Motility,viability,acrosomal,plasma membrane and nuclear integrities,and TAC were significantly decreased(P<0.05)while sperm abnormality,AST,ALT,total cholesterol and MDA were significantly increased as liquid semen storage period advanced(P<0.05).Conclusions:Monsoon season has higher beneficial effects on semen quality profiles and liquid stored semen remained usable for upto 48 h.Good quality ejaculates with higher TAC and lower MDA can be cryopreserved and will be used for artificial insemination.

猪精液常温保存的影响因素及抗氧化剂的应用

猪的人工授精技术发展促进了养猪业规模扩大和专业化程度提升,提高猪精液的保存效果是推进人工授精技术发展的关键。目前,大部分猪精液为常温保存,但这一保存方法容易导致精液内活性氧过度积累,降低精液质量。稀释剂中加入适量的抗氧化剂,能够改善猪精液的质量并延长保存期限。本文综述了猪精液常温保存的主要影响因素和抗氧化剂在猪精液常温保存稀释剂中的应用进展,以期为抗氧化剂在猪精液常温保存中的应用提供理论支持,并为开发新型猪精液稀释剂提供参考。

Lifestyle: an underrated but potentially important influencing factor on semen quality

Lifestyle factors play a crucial role in the influence of semen quality,and they are especially significant in the context of traditional Chinese medicine(TCM)clinical treatment for poor semen quality.TCM theory emphasizes the importance of healthy lifestyle habits for overall well-being.Therefore,it is essential to consider lifestyle factors in the clinical management of TCM and semen quality.Lifestyle can act as a bias factor that affects research quality,making it vital to pay special attention to its impact in clinical trial research on male semen quality.This article aims to improve the quality and design of clinical research on male sperm quality by examining the effects of various lifestyle factors on semen quality,including physical activities,dietary patterns,smoking,alcohol consumption,coffee intake,sleep,and psychological stress.Each lifestyle factor has its own distinct influence on semen quality,and there is a synergistic effect when multiple lifestyle factors are combined.These findings emphasize the need for careful consideration of lifestyle factors and their interactions in the design and implementation of TCM clinical trial research.

冷冻保存技术在蜜蜂精液保存中的研究与应用

蜜蜂精液冷冻保存对蜜蜂种质资源保护和品种改良具有重要意义,有利于蜜蜂育种中的后裔测定和基因组选择,加快育种进程。蜜蜂精子结构特殊,冷冻保存对其活力和受精率有较大影响,目前该技术尚未广泛应用。该文综述了蜜蜂精液冷冻保存的研究简况、蜜蜂精子的结构、冷冻损伤机理和精液冷冻技术的研究进展,以期为今后进一步优化改进蜜蜂精液冷冻保存技术提供参考。

水苏糖对秦川牛精液冷冻保存效果的影响

试验主要探究在牛精液冷冻稀释液中添加水苏糖对秦川牛精液冷冻保存效果的影响。添加不同浓度(0、20、40、60、80 mg/mL)水苏糖到牛精液冷冻基础稀释液中,检测冷冻-解冻后秦川牛精子运动性能、质膜完整性、顶体完整率、线粒体活性及抗氧化性相关指标。结果表明,与对照组相比,40 mg/mL水苏糖处理显著(P<0.05)提高冷冻-解冻后精子活力(43.83%)和顶体完整率(78.70%);质膜的完整性和线粒体活性在随着水苏糖浓度的增加显著提升,但质膜的完整性在不同水苏糖浓度之间差异不显著(P>0.05);同时,40 mg/mL水苏糖组显著提高GSH-Px酶和CAT酶的活性(P<0.05),并显著降低精子细胞中的MDA含量(P<0.05)。综上表明,40 mg/mL水苏糖处理显著提升冷冻-解冻后牛精子品质和抗氧化能力,对秦川牛的冷冻精液具有较好保存效果。

酸枣仁与理枣仁鉴别方法研究

目的 建立酸枣仁及常见伪品理枣仁的鉴别方法,为酸枣仁的质量控制和市场监督提供依据。方法 对酸枣仁和理枣仁进行性状及显微鉴别,采用超高效液相色谱串联质谱(UPLC-MS/MS)法测定其中6’’’-芥子酰斯皮诺素的含量,色谱柱为Phenomenex C18柱(100 mm×2.1 mm,2.6μm),流动相为0.1%甲酸-10 mmol/L甲酸铵水溶液-甲醇(梯度洗脱),流速为0.2 mL/min,柱温为30℃,进样量为5μL,离子源为电喷雾离子源,正离子、多反应监测模式扫描,电喷雾电压为3.5 kV,离子源温度为150℃,去溶剂气温度为500℃,扫描范围为50~1 000 amu。结果 酸枣仁和理枣仁在性状上外种皮纹理存在差异,在显微特征上外种皮栅状细胞、种皮内表皮细胞存在差异。6’’’-芥子酰斯皮诺素的质量浓度在0.205 2~6.156μg/mL范围内与峰面积积分值线性关系良好(r=0.997 5,n=6),检测限为21.13 pg。酸枣仁和理枣仁样品的精密度、稳定性、重复性试验结果的RSD均低于3.0%(n=6);加样回收率分别为97.01%和97.80%,RSD分别为2.15%和2.09%(n=6)。10批酸枣仁和理枣仁中6’’’-芥子酰斯皮诺素的含量分别为0.23,3.70μg/mL。拟订酸枣仁中掺伪理枣仁限度为5%,样品中6’’’-芥子酰斯皮诺素测得含量大于0.5μg/mL时可视为掺伪理枣仁。结论 所建立的方法操作简便、结果准确、重复性和稳定性均良好,可有效鉴别酸枣仁和理枣仁。

不同精液质量男性生殖激素水平与氧化应激的临床分析

目的分析不同精液质量男性生殖激素和抗氧化水平,探讨生殖激素及抗氧化对男性精液质量的影响。方法在北华大学附属医院生殖中心筛选28名单纯少精子症、36名单纯弱精子组和28名少弱精子症患者精液。精液分析按照世界卫生组织的标准进行。化学发光免疫法测定血清促卵泡生成素(FSH)、促黄体生成素、泌乳素、雌二醇、睾酮(T)浓度。黄嘌呤氧化酶法检测超氧化物歧化酶(SOD)活性,采用活性氧试剂盒检测精浆中活性氧(ROS)水平。结果不育组男性精液浓度、前向运动精子率、精子总活力和精子不活动率与对照组差异有统计学意义(P<0.05)。不育组患者血清中T浓度明显低于对照组,差异有统计学意义(P<0.05);少弱精症组中FSH明显高于对照组,差异有统计学意义(P<0.05)。不育组SOD活力和ROS水平与对照组相比差异有统计学意义(P<0.05)。结论睾酮合成下降与男性不育有关,少精、弱精、少弱精的重要原因可能是氧化应激中抗氧化剂与ROS的脂质过氧化损伤的不平衡。