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Quantitive analysis of flavonoids in ainaxiang tablets by high-performance liquid chromatography
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TAN, Daopeng

; WANG, Guopan

; WANG, Jianmei

; FENG, Yidong

; HE, Yuqi

Food Science and Technology

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2023, Volume 43 elocation e130422

Abstract: En | Text: En | PDF: En

Abstract: Blumea balsamifera is a very famous medicinal plant and functional tea in many countries of Asia. Ainaxiang tablets are a preparation consisting of flavonoids from B. balsamifera. Today, a high performance liquid chromatography method was developed for simultaneous quantification of 15 flavonoids in Ainaxiang Tablets. The analysis was performed on a Kromasil C18 column (250 × 4.6 mm, 5 µm) with a binary gradient mobile phase of acetonitrile and 0.2% aqueous acetic acid. The method was validated in terms of linearity, sensitivity, stability, precision and accuracy. It was found that this method had linearity with R2 at 0.9992- 0.9999 in the test range of 0.15-276.40 µg/mL. The limit of detection (LOD) and limit of quantification (LOQ) for 15 tested reference compounds were 0.01-0.28µg/mL and 0.02 - 0.55µg/mL, respectively. The relative standard deviations (RSD%) for intra-day and inter-day repeatability were not more than 3.18%. The analyzed samples were stable for at least 18 h. The spike recoveries for 15 analyzed samples were 106.17 - 95.02%. The results suggested that this newly developed HPLC method could be used for quantitative analysis of flavonoids in Ainaxiang Tablets and its raw materials.

https://doi.org/10.1590/fst.130422

STUDY ON THE HEALTH AND SELF-EFFICACY OF PREGNANT WOMEN IN DELIVERY WITH MUSIC ANALGESIA AND LABOR DOULA
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Feng, Fan

Revista Brasileira de Medicina do Esporte

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mar 2021, Volume 27 N. spe Pages 50 - 52

Abstract: Pt En Es | Text: Pt En Es | PDF: Pt | PDF: En | PDF: Es

RESUMO Explorar o efeito do parto apoiado por doulas combinado com a terapia musical em estabilizar o estado psicológico materno e melhorar a qualidade do parto, e descobrir os indicadores de autoeficácia do parto. O processamento estatístico mostrou que P<0.05, o que foi estatisticamente significativo. O Grupo foi superior em valor numérico, seguido pelo Grupo B. Por meio do teste da soma dos ranks, o grau de dor do grupo experimental foi significativamente menor do que o do grupo controle, e a diferença foi estatisticamente significativa (P<0.05). O teste de T ou teste de χ2 mostrou que o tempo de trabalho de parto total do grupo experimental foi mais curto do que o do grupo controle. A taxa de parto normal foi maior do que a do grupo, e a taxa de cesariana foi menor do que a do grupo controle, e a diferença foi estatisticamente significativa (P<0.05). Conclusão: O parto feito com doulas combinado com a terapia musical é eficaz para a parturiente, podendo aliviar a dor do parto, acelerar o trabalho de parto e melhorar a qualidade do parto, merecendo maior popularização e aplicação. Ao mesmo tempo, aumentar a compreensão das gestantes sobre estratégias e técnicas de parto e melhorar seu estado psicológico ajudará a melhorar o nível de autoeficácia do parto dessas mulheres.

ABSTRACT To explore the effect of delivery supported by a labor doula combined with music therapy on stabilizing maternal psychology and improving delivery quality, and to find out the predictors of delivery self-efficacy. Statistical processing showed that P<0.05, which was statistically significant. Group was superior in numerical value, followed by the B group. Using the rank sum test, the pain grade of the experimental group was significantly lower than that of the control group, and the difference was statistically significant (P<0.05). T test or χ2 test showed that the total labor time of the experimental group was shorter than that of the control group. Vaginal delivery rate was higher than that of the control group, and the cesarean section rate was lower than that of the control group, and the difference was statistically significant (P<0.05). Conclusion: Doula delivery combined with music therapy is effective in parturient delivery, which can alleviate parturient pain, speed up labor progress and improve delivery quality, and is worthy of popularization and application. At the same time, increasing pregnant women’s understanding of delivery strategies and techniques and improving their psychological state will help improve the level of delivery self-efficacy of pregnant women.

RESUMEN Explorar el efecto del parto apoyado por una doula combinado con musicoterapia para estabilizar el estado psicológico materno, mejorar la calidad del parto, y descubrir los predictores de la autoeficacia del mismo. El procesamiento estadístico mostró P <0.05, lo que fue estadísticamente significativo. El grupo fue superior en valor numérico, seguido por el grupo B. Usando la prueba de la suma de rangos, el grado de dolor del grupo experimental fue significativamente más bajo que el del grupo de control, y la diferencia fue estadísticamente significativa (P <0.05). La prueba T o la prueba χ2 mostraron que el tiempo total de trabajo del grupo experimental fue más corto que el del grupo de control. La tasa de parto vaginal fue mayor que la del grupo de control, y la tasa de cesáreas fue menor que la del grupo de control, y la diferencia fue estadísticamente significativa (P <0.05). Conclusión: El parto con doulas combinado con musicoterapia es eficaz, puede aliviar el dolor de las parturientas, acelerar el progreso del parto y mejorar la calidad del mismo, y es digno de popularización y aplicación. Al mismo tiempo, aumentar la comprensión de las mujeres embarazadas sobre las estrategias y técnicas de parto y mejorar su estado psicológico ayudará a mejorar el nivel de autoeficacia del parto de las mujeres embarazadas.

https://doi.org/10.1590/1517-8692202127012020_0105 914 downloads

Baryon Acoustic Oscillations from Integrated Neutral Gas Observations: an instrument to observe the 21cm hydrogen line in the redshift range 0.13 < z < 0.45 – status update
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WUENSCHE, CARLOS A.

; ABDALLA, ELCIO

; ABDALLA, FILIPE

; BAROSI, LUCIANO

; WANG, BIN

; AN, RUI

; BARRETOS, JOÃO A. M.

; BATTYE, RICHARD

; BRITO, FRANCISCO A.

; BROWNE, IAN

; CORREIA, DANIEL

; COSTA, ANDRÉ A.

; DELABROUILLE, JACQUES

; DICKINSON, CLIVE

; FENG, CHANG

; FERREIRA, ELISA G. M.

; FORNAZIER, KARIN

; DE GASPERIS, GIANCARLO

; GUTIERREZ, PRISCILA

; HARPER, STUART

; LANDIM, RICARDO G.

; LICCARDO, VINCENZO

; MA, YIN-ZHE

; MACHADO, TELMO

; MAFFEI, BRUNO

; MARINS, ALESSANDRO

; MENDES, MILENA M. M.

; MERICIA, EDUARDO

; MONSTEIN, CHRISTIAN

; MOTTA, PABLO

; NOVAES, CAMILA

; OTOBONE, CARLOS H.

; PEEL, MICHAEL

; QUEIROZ, AMILCAR R.

; RADCLIFFE, CHRISTOPHER

; REMAZEILLES, MATHIEU

; RIBEIRO, RAFAEL M. G.

; SANG, YU

; SANTOS, JULIANA F. R.

; SANTOS, LARISSA

; SANTOS, MARCELO. V.

; SHAN, CHENXI

; SILVA, GUSTAVO B.

; VIEIRA, FREDERICO

; VIEIRA, JORDANY

; VILLELA, THYRSO

; XIAO, LINFENG

; YANG, WEIQIANG

; ZHANG, JIAJUN

; ZHANG, XUE

; ZHU, ZENGHAO

Anais da Academia Brasileira de Ciências

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2021, Volume 93 elocation e20201096

Abstract: En | Text: En | PDF: En

Abstract BINGO (BAO from Integrated Neutral Gas Observations) is a unique radio telescope designed to map the intensity of neutral hydrogen distribution at cosmological distances, making the first detection of Baryon Acoustic Oscillations (BAO) in the frequency band 980 MHz - 1260 MHz, corresponding to a redshift range 0.127 < z < 0.449. BAO is one of the most powerful probes of cosmological parameters and BINGO was designed to detect the BAO signal to a level that makes it possible to put new constraints on the equation of state of dark energy. The telescope will be built in Paraíba, Brazil and consists of two \thicksim 40m mirrors, a feedhorn array of 50 horns, and no moving parts, working as a drift-scan instrument. It will cover a 15 ^{\circ} ∘ declination strip centered at \sim \delta ∼ δ =-15 ^{\circ} ∘, mapping \sim ∼ 5400 square degrees in the sky. The BINGO consortium is led by University of São Paulo with co-leadership at National Institute for Space Research and Campina Grande Federal University (Brazil). Telescope subsystems have already been fabricated and tested, and the dish and structure fabrication are expected to start in late 2020, as well as the road and terrain preparation.

https://doi.org/10.1590/0001-3765202120201096 413 downloads

Screening a bacterium and its effect on the biological degumming of ramie and kenaf
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Cheng, Lifeng

; Wang, Qiming

; Feng, Xiangyuan

; Duan, Shengwen

; Yang, Qi

; Zheng, Ke

; Liu, Zhiyuan

; Liu, Zhengchu

; Peng, Yuande

Scientia Agricola

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sep 2018, Volume 75 N. 5 Pages 375 - 380

Abstract: En | Text: En | PDF: En

ABSTRACT: Biological degumming is an eco-friendly, efficient, high-quality and low-cost method that has become the leading bast fiber degumming technology. However, bacterial strains with short degumming cycles, high gum removal rates and small fiber damage are few. To screen high quality microbial resources with bast-fiber biological degumming function, soil samples were collected from a continuously cultivated banana plantation and then used to be enriched by ramie and kenaf materials in turn. A selective pectin-degrading medium was used to screen for excellent bacteria. A dominant bacterial strain was identified by phenotypic and genotypic characteristics, and its biological degumming effects on ramie and kenaf were verified by a comprehensive evaluation system. Results showed that seven bacterial strains secreting pectinase were obtained and the largest hydrolysis circle with a diameter ratio H/C of 2.4 was produced by the bacterial strain hn1-1, which was preliminarily identified as the Bacillus cereus by colony morphological characteristics and 16S rDNA sequence (GenBank accession number: KX013542) cluster analysis. The fiber production of ramie and kenaf degummed by B. cereus hn1-1 for 10 h were 72 % and 76 %, the residual gum rates were 4 % and 5 %, respectively. These values satisfied the textile industry requirement of < 6 % residual gum rate. Therefore, an effective biological degumming bacterium, B. cereus, was identified using a pectin-hydrolysis selective medium through a simple, economical, and time-saving method. Furthermore, the biological degumming technology by B. cereus for ramie and kenaf had a short cycle, ideal removal gum rate, and high-quality and productive fiber output.

https://doi.org/10.1590/1678-992x-2017-0108 1199 downloads

Effectiveness of preoperative decolonization with nasal povidone iodine in Chinese patients undergoing elective orthopedic surgery: a prospective cross-sectional study
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Peng, H-M.

; Wang, L-C.

; Zhai, J-L.

; Weng, X-S.

; Feng, B.

; Wang, W.

Brazilian Journal of Medical and Biological Research

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2018, Volume 51 N. 2 elocation e6736

Abstract: En | Text: En | PDF: En

Staphylococcus aureus colonization in the nares of patients undergoing elective orthopedic surgery increases the potential risk of surgical site infections. Methicillin-resistant S. aureus (MRSA) has gained recognition as a pathogen that is no longer only just a hospital-acquired pathogen. Patients positive for MRSA are associated with higher rates of morbidity and mortality following infection. MRSA is commonly found in the nares, and methicillin-sensitive S. aureus (MSSA) is even more prevalent. Recently, studies have determined that screening for this pathogen prior to surgery and diminishing staphylococcal infections at the surgical site will dramatically reduce surgical site infections. A nasal mupirocin treatment is shown to significantly reduce the colonization of the pathogen. However, this treatment is expensive and is currently not available in China. Thus, in this study, we first sought to determine the prevalence of MSSA/MSRA in patients undergoing elective orthopedic surgery in northern China, and then, we treated the positive patients with a nasal povidone-iodine swab. Here, we demonstrate a successful reduction in the colonization of S. aureus. We propose that this treatment could serve as a cost-effective means of eradicating this pathogen in patients undergoing elective orthopedic surgery, which might reduce the rate of surgical site infections.

https://doi.org/10.1590/1414-431x20176736 2636 downloads

Isolation, identification, and biocontrol of antagonistic bacterium against Botrytis cinerea after tomato harvest
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Shi, Jun-Feng

; Sun, Chang-Qing

Brazilian Journal of Microbiology

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dec 2017, Volume 48 N. 4 Pages 706 - 714

Abstract: En | Text: En | PDF: En

ABSTRACT Tomato is one of the most important vegetables in the world. Decay after harvest is a major issue in the development of tomato industry. Currently, the most effective method for controlling decay after harvest is storage of tomato at low temperature combined with usage of chemical bactericide; however, long-term usage of chemical bactericide not only causes pathogen resistance but also is harmful for human health and environment. Biocontrol method for the management of disease after tomato harvest has great practical significance. In this study, antagonistic bacterium B-6-1 strain was isolated from the surface of tomato and identified as Enterobacter cowanii based on morphological characteristics and physiological and biochemical features combined with sequence analysis of 16SrDNA and ropB gene and construction of dendrogram. Effects of different concentrations of antagonistic bacterium E. cowanii suspension on antifungal activity after tomato harvest were analyzed by mycelium growth rate method. Results revealed that antifungal activity was also enhanced with increasing concentrations of antagonistic bacterium; inhibitory rates of 1 × 105 colony-forming units (cfu)/mL antagonistic bacterial solution on Fusarium verticillioides, Alternaria tenuissima, and Botrytis cinerea were 46.31%, 67.48%, and 75.67%, respectively. By using in vivo inoculation method, it was further confirmed that antagonistic bacterium could effectively inhibit the occurrence of B. cinerae after tomato harvest, biocontrol effect of 1 × 109 cfu/mL zymotic fluid reached up to 95.24%, and antagonistic bacterium E. cowanii has biocontrol potential against B. cinerea after harvest of fruits and vegetables.

https://doi.org/10.1016/j.bjm.2017.03.002 3707 downloads

Relative influence of soil chemistry and topography on soil available micronutrients by structural equation modeling
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Zhu, Hongfen

; Zhao, Ying

; Nan, Feng

; Duan, Yonghong

; Bi, Rutian

Journal of soil science and plant nutrition

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dec 2016, Volume 16 N. 4 Pages 1038 - 1051

Abstract: En | Text: En | PDF: En

Soil chemical and topographic properties are two important factors influencing available micronutrient distribution of soil in the horizontal dimension. The objective of this study was to explore the relative influence of soil chemistry (including soil pH, soil organic matter, total nitrogen, available phosphorus, and available potassium) and topography (including elevation, slope, aspect, and wetness index) on the availability of micronutrients (Fe, Mn, Cu, Zn, and B) using structural equation modeling (SEM) at the watershed scale. To do this, levels of soil micronutrients, pH, soil organic matter, total nitrogen, available phosphorus, available potassium, and topographic factors were measured at 523 sampling points of Fanshi County on the Chinese Loess Plateau, and the spatial distribution of soil available micronutrients were analyzed by geostatistical method. The results showed that topography had both direct effects and indirect effect on some soil micronutrients, while the indirect effect indicated effects from topography on soil chemistry and then further on micronutrient concentration. Soil chemistry had direct effects on levels of all soil micronutrients, and topography had direct effects on levels of all micronutrients except for Cu and B, and indirect effects on Fe, Zn, and B. The direct effect of soil chemistry on Fe levels was greater than the total effects (including both direct and indirect) of topography. Topography had a stronger direct effect on Mn than soil chemistry, and topography had less direct but stronger total effects on Zn than soil chemistry. Soil chemistry directly influenced both Cu and B, but topography only influenced B in an indirect manner. The semivariance indicated that the micronutrients had moderate spatial dependency except for B which had weak spatial dependency. Within the spatial distribution of the micronutrients, there was a zone in the middle of the watershed with lower values than in the northern and southern areas for Fe, Mn, Zn, and B, which were related to the characteristics of topography and soil chemistry. These results may guide the management of soil micronutrients of the Chinese Loess Plateau and other similar regions in the world.

1858 downloads

Prevalence of genital human papillomavirus among rural and urban populations in southern Yunnan province, China
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Baloch, Z.

; Yuan, T.

; Yindi, S.

; Feng, Y.

; Tai, W.

; Liu, Y.

; Liu, L.

; Zhang, A.

; Wang, B.

; Wu, X.

; Xia, X.

Brazilian Journal of Medical and Biological Research

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2016, Volume 49 N. 6 elocation e5254

Abstract: En | Text: En | PDF: En

This study was designed to investigate and compare the HPV prevalence, genotypes distribution and associated risk factors in rural and urban women living in Xishuang Banna district, in the province of Yunnan. A total of 177 and 190 women from rural and urban areas were engaged, respectively. HPV DNA was amplified using the L1 consensus primers system (MY09/11 and GP5/6) and HPV GenoArray test was conducted for genotyping. Proportions were compared by chi-square test, and logistic regression was used to evaluate risk factors. A total of 54 women were positive for HPV DNA. Among rural women, 23 women were positive for HPV infection, of which 21 showed a single infection and 2 had a multiple infection. HPV-16 (10/23) was the most prevalent genotype followed by HPV-52 (5/23), and HPV-58 (5/23). Urban women had a higher infection rate for overall HPV (31/54) and for multiple genotype infection (8/31). HPV-52 (9/31) was the most prevalent genotype followed by HPV-39 (7/31) and HPV-68 (5/31). The age-specific HPV prevalence was also different between rural and urban women. In urban area, women with age <35 years had the highest HPV prevalence, which declined thereafter as age advanced. However, in rural women the highest HPV prevalence was observed in an older age group (>56 years). Ethnicity, smoking and parity were significantly associated with HPV infection among urban women. Our study demonstrates that HPV prevalence and genotype distribution varies among women from rural and urban areas in the south of Yunnan.

https://doi.org/10.1590/1414-431x20165254 1507 downloads

The effect of sodium carbonate on the dispersion behaviour and froth flotation of a nickel ore
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Feng, B.

; Feng, Q.M.

; Lu, Y.P.

; Wang, H.H.

Journal of the Southern African Institute of Mining and Metallurgy

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dec 2015, Volume 115 N. 12 Pages 1239 - 1242

Abstract: En | Text: En | PDF: En

The effect of sodium carbonate on the flotation performance of a nickel ore was studied and the mechanism investigated. The flotation results show that lizardite minerals in the ore interfere with the flotation of pentlandite, and the addition of sodium carbonate improves pentlandite flotation recovery. The pulp pH did not change with increasing sodium carbonate dosage. Drawing on the literature in this area, combined with the sedimentation test results, sieving test results, and infrared spectra study, it is proposed that carbonate ions, derived from sodium carbonate, interact with lizardite slime and change the interparticle force from attraction to repulsion, resulting in the removal of adhering slimes from pentlandite surfaces.

https://doi.org/10.17159/2411-9717/2015/v115n12a13 739 downloads

10.

Design of signal peptide bombyxin and its effect on secretory expression efficiency and levels of Helicobacter pylori urease subunit B in silkworm cells and larvae
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Zhang, Xiao-lin

; Jiang, An-min

; Ma, Zhong-you

; Xiong, You-yi

; Dou, Jin-feng

; Zhou, Guo-liang

; Qin, Mei-song

; Wang, Jian-fei

Brazilian Archives of Biology and Technology

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jun 2015, Volume 58 N. 3 Pages 319 - 325

Abstract: En | Text: En | PDF: En

This study employed a Bac-to-Bac/Bombyx mori bioreactor to mass-produce immunogenic urease subunit B (UreB) from Helicobacter pylori.The signal peptide bombyxin from B. mori was used to promote secretory expression to improve expression levels and was designed and integrated into the UreB gene to generate the Bacmid/BmNPV/(signal peptide)-UreB baculovirus expression system. To determine whether the bombyxin signal peptide resulted in secretory expression of recombinant UreB (rUreB) and to determine the secretory efficiency, we tested the secretory expression level of rUreB in Bm5 cells using ELISA. To further investigate whether secretory expression affected cell viability, cells were evaluated using 0.4% trypan blue staining, and Bacmid/BmNPV/UreB without the signal peptide served as a control. The above recombinant bacmid constructs were injected to silkworm larvae, and the secretory expression level of rUreB was detected using SDS-PAGE and semi-quantitative western blot analysis. The results indicated that the bombyxin signal peptide directed the secretory expression of rUreB and that this expression improved the viability of Bm5 cells. Moreover, the results showed that the expression level of rUreB was 1.5 times higher with the Bacmid/BmNPV constructs containing the bombyxin signal sequence than those without the signal sequence. These results demonstrate that secretory expression can enhance rUreB expression levels and is likely to aid in the large-scale expression and yield of rUreB in silkworm larvae.

https://doi.org/10.1590/S1516-8913201500013 2677 downloads

11.

Ensuring a Reasonable Passenger Capacity Utilization Rate of a Train for Its Sustainably Efficient Transport
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Feng, X.

; Wang, Q.

; Liu, Y.

; Xu, B.

; Liu, H.

; Sun, Q.

Journal of applied research and technology

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2014, Volume 12 N. 2 Pages 279 - 288

Abstract: En | Text: En | PDF: En

Based on simulations of the transports of a typically formed Chinese intercity passenger train hauled respectively by major types of the locomotives on a certain railway line in China, this research analyzes the changes of the traction energy cost intensity and passenger transport efficiency of the train with varying its passenger capacity utilization rate and target speed. It is found that if the passenger capacity utilization rate of such a train is higher than 60.00%, the effect of its passenger capacity utilization rate and target speed on its traction energy cost intensity and passenger transport efficiency is relatively very small. In contrast, if the passenger capacity utilization rate of the train is reduced from 40.00%, the efficiencies of its traction energy cost and passenger transport both decrease obviously and such decreases are evidently affected by its target speed. Therefore, strictly preventing the passenger capacity utilization rate of a conventional intercity passenger train from decreasing from 40.00% in particular and meanwhile striving to make its passenger capacity utilization rate higher than 60.00% as new evaluation benchmarking are able to effectively improve the railway passenger transport operation management in China.

812 downloads

12.

Effect of cervical sympathetic block on cerebral vasospasm after subarachnoid hemorrhage in rabbits
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Chun-jing, He

; Shan, Ou

; Guo-dong, Liu

; Hao-xiong, Nie

; Yi-ran, Luo

; Ya-ping, Feng

Acta Cirúrgica Brasileira

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feb 2013, Volume 28 N. 2 Pages 89 - 93

Abstract: En | Text: En | PDF: En

PURPOSE: Cerebral vasospasm (CVS) is a major complication after subarachnoid hemorrhage (SAH) induced by the rupture of intracranial aneurysms. The aim of the present study was to investigate the effect and mechanism of cervical sympathetic block on cerebral vasospasm of the rabbits after SAH. METHODS: After successful modeling of cervical sympathetic block, 18 healthy male white rabbits were randomly divided into three groups (n=6), ie, sham operation group (Group A), SAH group (Group B) and SAH with cervical sympathetic block group (Group C). Models of delayed CVS were established by puncturing cisterna magna twice with an injection of autologous arterial blood in Groups B and C. A sham injection of blood through cisterna magna was made in Group A. 0.5 ml saline was injected each time through a catheter for cervical sympathetic block after the first injection of blood three times a day for 3 d in Group B (bilateral alternating). 0.5 ml of 0.25% bupivacaine was injected each time through a catheter for cervical sympathetic block after the first injection of blood three times a day for 7 d in Group B. 2 ml venous blood and cerebrospinal fluid were obtained before (T1), 30 min (T2) and 7 d (T3) after the first injection of blood, respectively, and conserved in a low temperature refrigerator. Basilar artery value at T1, T2 and T3 was measured via cerebral angiography. The degree of damage to nervous system at T1 and T3 was recorded. RESULTS: There was no significant difference in diameter of basilar artery at T1 among three groups. The diameters of basilar artery at T2 and T3 of Groups B and C were all smaller than that in Group A, which was smaller than Group C, with a significant difference. There was no significant difference in NO and NOS in plasma and cerebrospinal fluid among three groups. The NO and NOS contents at T2 and T3 of Groups B and C were all lower than Group A; Group C was higher than Group B, with a significant difference. The nerve function at T3 of Groups B and C were all lower than Group A and that of Group C higher than Group B, with a significant difference. CONCLUSION: Cervical sympathetic block can relieve cerebral vasospasm after subarachnoid hemorrhage and increase NO content and NOS activity in plasma and cerebrospinal fluid to promote neural functional recovery.

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13.

Effects of the conditioned medium of mesenchymal stem cells on mouse oocyte activation and development
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Feng, D.Q.

; Zhou, Y.

; Ling, B.

; Gao, T.

; Shi, Y.Y.

; Wei, H.M.

; Tian, Z.G.

Brazilian Journal of Medical and Biological Research

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jun 2009, Volume 42 N. 6 Pages 506 - 514

Abstract: En | Text: En | PDF: En

Mesenchymal stem cells (MSCs) have been reported to secrete a variety of cytokines and growth factors acting as trophic suppliers, but little is known regarding the effects of conditioned medium (CM) of MSCs isolated from femurs and tibias of mouse on the artificial activation of mouse oocytes and on the developmental competence of the parthenotes. In the current study, we investigated the effect of CM on the events of mouse oocyte activation, namely oscillations of cytosolic calcium concentration ([Ca²+]i), meiosis resumption, pronucleus formation, and parthenogenetic development. The surface markers of MSCs were identified with a fluorescence-activated cell sorter. The dynamic changes of the spindle and formation of pronuclei were examined by laser-scanning confocal microscopy. Exposure of cumulus-oocyte complexes to CM for 40 min was optimal for inducing oocyte parthenogenetic activation and evoking [Ca²+]i oscillations similar to those evoked by sperm (95 vs 100%; P > 0.05). Parthenogenetically activated oocytes immediately treated with 7.5 µg/mL cytochalasin B (CB), which inhibited spindle rotation and second polar body extrusion, were mostly diploid (93 vs 6%, P < 0.01) while CB-untreated oocytes were mostly haploid (5 vs 83%, P < 0.01). Consequently, the blastocyst rate was higher in the CB-treated than in the CB-untreated oocytes. There was no significant difference in developmental rate between oocytes activated with CM and 7% ethanol (62 vs 62%, P > 0.05), but the developmental competence of the fertilized oocytes was superior to that of the parthenotes (88 vs 62%, P < 0.05). The present results demonstrate that CM can effectively activate mouse oocytes, as judged by the generation of [Ca²+]i oscillations, completion of meiosis and parthenogenetic development.

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14.

Effect of conditioned medium of mesenchymal stem cells on the in vitro maturation and subsequent development of mouse oocyte
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Ling, B.

; Feng, D.Q.

; Zhou, Y.

; Gao, T.

; Wei, H.M.

; Tian, Z.G.

Brazilian Journal of Medical and Biological Research

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- SciELO Analytics

nov 2008, Volume 41 N. 11 Pages 978 - 985

Abstract: En | Text: En | PDF: En

Mesenchymal stem cells (MSCs) secrete a variety of cytokines and growth factors in addition to self-renewal and multiple forms of differentiation. Some of these secreted bioactive factors could improve meiotic maturation in vitro and subsequent embryo developmental potential. The aim of the present study was to determine whether in vitro maturation (IVM) of mouse oocyte with or without cumulus cells could be improved by contact with conditioned medium (CM) of MSCs as well as the efficiency of CM to support follicular growth and oocyte maturation in the ovarian organ of mice cultured on soft agar. The developmental potential of matured oocyte was assessed by blastocyst formation after in vitro fertilization (IVF). Germinal vesicle stage oocytes with or without cumulus cells were subjected to IVM in either CM, Dulbecco's modified Eagle's medium (DMEM), α-minimum essential medium (α-MEM) or human tubal fluid (HTF). Approximately 120 oocytes were studied for each medium. CM produced a higher maturation rate (91.2%) than DMEM (54.7%), α-MEM (63.5%) and HTF (27.1%). Moreover, CM improved embryo development to blastocyst stage significantly more than DMEM and HTF (85 vs 7% and 41.7%, respectively) but there was no significant difference compared with α-MEM (85 vs 80.3%). The behavior of cortical granules of IVM oocytes cultured in CM revealed cytoplasmic maturation. Moreover, CM also supported preantral follicles growth well in organotypic culture on soft agar resulting in the maturation of 60% of them to developmentally competent oocytes. The production of estrogen progressively increased approximately 1-fold every other day during organ culture, while a dramatic 10-fold increase in progesterone was observed 17 h after human chorionic gonadotropin stimulus at the end of culture. Thus, CM is an effective medium for preantral follicle growth, oocyte maturation, and sequential embryo development.

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