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Hojjat-Allah Abbaszadeh Taki Tiraihi Ali Reza Delshad Majid Saghedi Zadeh Taher Taheri 《Iranian Biomedical Journal》2013,17(2):62-70
Background: The present study investigated the functional maturity of oligodendrocyte derived from rat bone marrow stromal cells (BMSC). Methods: The BMSC were isolated from female Sprague-Dawley rats and evaluated for different markers, such as fibronectin, CD106, CD90, Oct-4 and CD45. Transdifferentiation of OLC from BMSC was obtained by exposing the BMSC to DMSO and 1 µM all-trans-retinoic acid during the pre-induction stage and then induced by heregulin (HRG), platelet-derived growth factor AA (PDGFR-α), fibroblast growth factor and T3. The neuroprogenitor cells (NPC) were evaluated for nestin, neurofilament 68, neurofilament 160 and glial fibrillary acidic protein gene expression using immunocytochemistry. The OLC were assessed by immunocytochemistry for O4, oligo2, O1 and MBP marker and gene expression of PDGFR-α was examined by RT-PCR. Results: Our results showed that the fibronectin, CD106, CD90, CD45 and Oct-4 were expressed after the fourth passage. Also, the yield of OLC differentiation was about 71% when using the O1, O4 and oligo2 markers. Likewise, the expression of PDGFR-α in pre-oligodendrocytes was noticed, while MBP expression was detected in oligodendrocyte after 6 days of the induction. Conclusion: The conclusion of the study showed that BMSC can be induced to transdifferentiate into mature OLC. Key Words: Bone marrow stromal cell, Triiodothyronine, Platelet-derived growth factor α 相似文献
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江滨农场水稻办从生产实际需要出发,参考机动播种机播种原理,同江滨机械厂技术人员共同研究,1997年试制出ZFS-2型手动育秧播种机,经过生产推广应用,取得良好效果,克服了机动播种投资大、需电源、用人多和手撒种播不均、质量差等缺点,具有播种速度快,质量好,使用灵活,造价低等优点,便干一家一户播种使用。几种播种方式效果比较见表1。12FS一2型育秧播种机特点1·1使用灵活方便:该机重量轻,采用的材料是铝合金、塑料、自行车飞轮、薄铁皮等,一人轻松移动和播种作业,操作方便,简单易行。1.2播种速度快:一般速度每分钟6~8… 相似文献
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通过用不同浓度的烟酰胺腺嘌呤二核苷酸磷酸(nicotinamide adenine dinucleotide phosphate, NADPH)合成酶抑制剂碘二苯(diphenylene iodonium, DPI)及过氧化氢(hydrogen peroxide, H2O2)清除剂二甲基硫脲(dimethylthiourea, DMTU)分别培养水稻(Oryza sativa L.)种子,研究内源H2O2对种子萌发过程胚根、胚芽和胚根根尖活力等的影响。结果表明,DPI及DMTU培养的水稻种子其胚根生长和胚芽生长均受到抑制,尤其是DPI对胚根生长的抑制作用更为显著。DPI和DMTU对水稻种子萌发的影响均呈现出浓度效应,即浓度越高,抑制作用越强。其中,DPI对水稻种子萌发的抑制作用比DMTU的更为明显。此外,胚根根尖的超氧阴离子(superoxide anion, O 2-)和H2O2含量随DMTU浓度增大而减少,根尖细胞受损也越严重。由此推测,内源H2O2可能参与调控水稻种子萌发过程。 相似文献
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利用3个2n配子材料(2x)在马铃薯(S.tuberosum L.)中进行4x—2x,2x—4x和2x—2x的杂交,获得了4个四倍体杂种材料;然后对它们进行花药培养,共得到32个双单倍体植株。检查其中23个植株,有2株是具5%以上2n花粉粒的双单倍体,1株是重组了2n卵基因的双单倍体。由此证明花药培养的倍性操作技术是转育马铃薯2n配子性状给双单倍体的有效方法之一。 相似文献
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研究沉香叶黄酮稳定性及对H2O2诱导HepG2细胞氧化损伤的保护作用。通过测定溶液吸光值,探讨温度、光照、金属离子、pH值对沉香叶黄酮稳定性的影响。建立H2O2诱导HepG2细胞氧化损伤模型,将细胞分为正常组、模型组以及沉香叶黄酮低、中、高剂量组,采用水溶性四唑盐法检测细胞增殖率,2′,7′-二氢二氯荧光黄双乙酸钠法(DCFH-DA)测定细胞内活性氧(ROS)水平,生化试剂盒检测细胞乳酸脱氢酶(LDH)释放量、丙二醛(MDA)含量、细胞内总超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)和过氧化氢酶(CAT)活性。结果表明,沉香叶黄酮在温度70 ℃以下,pH 3~7范围内,Na+、K+、Mg2+、Ca2+金属离子中,黑暗环境与节能灯光中较稳定;能显著抑制H2O2造成的细胞死亡,降低胞内ROS与MDA的生成,减轻LDH向细胞外扩散程度,提高SOD、CAT、GSH-Px活性。沉香叶黄酮在低温、弱酸、部分金属离子、弱光条件下具有一定稳定性;对H2O2诱导HepG2氧化应激损伤具有保护作用,其作用可能与调节细胞氧化还原系统、清除胞内活性氧水平、提高细胞内抗氧化酶系活性有关。 相似文献
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