星形胶质细胞

AIM: To culture astrocytes from human donor eyes in order to understand the function of astrocytes in remodelling events in the glaucomatous optic nerve head.

目的：探索人眼视神经乳头星形胶质细胞体外培养的方法，为进一步研究星形胶质细胞在青光眼性视神经病变中的作用打下基础。

Results:(1)NSCs form typical neurospheres under adequate concentration in vitro, which are immunoreactive to Vimentin. Typically and terminally differentiated mature neural cells could not be found without the stimulus of mitogen or only under NSCs self-regulation and self-induction;(2)NSCs derived from hippocampus maintain the character of stem cells much longer with better biological behavior; NSCs passed to the 2-3 passage are the best to graft since they have not differentiated;(3)NSCs cultured in vitro could self-regulate and differentiate into neurospheres and progenitors positively immunoreactive to specific antibodies representing neurons, astrocytes, oligodendrocytes and Schwann cells;(4)There are widespread synaptic contacts between various kinds of descendent clones and cells;(5)Neurospheres could be formed without the stimulus of mitogen when NSCs and OECs are cocultured. Many neurospheres and cells immunoreactive to Vimentin, GFAP, MAP2, 02, p75NGFR, GFAP, S-100, Synaptosis, Vimentin, Tau (Tau is only positive in cocultureof HNSCs+HOECs) could be found;(6)The supernatant fluid triturated from adult rat spinal cord stimulates NSCs to differentiate into neurons, but do not terminally differentiate;(7)Fibroblasts and O4 oligodendrocytes are not supported to grow under this culture medium.Part II: Isolation, culture and identification of rat and human olfactory ensheathing cellsOlfactory ensheathing cells/glials are the most powerful cells to enable the regeneration of axons in the central nervous system.

结果表明：①在适宜的浓度体外培养条件下，NSCs能形成典型的神经干细胞克隆球，Vimentin免疫荧光染色阳性，单靠丝裂原刺激或NSCs自我调节和分化诱导，不会产生典型的终末分化的成熟神经细胞；②海马源性的NSCs维持干细胞特性的时间更长，生物学特性更优；③传至第2～3代的NSCs尚未分化时移植最佳；④体外培养的NSCs能自我调控分化为神经元、星形胶质细胞、O2少突胶质细胞、雪旺氏细胞染色阳性克隆球和前体细胞；⑤各种子代克隆球和细胞存在广泛的突触联系；⑥NSCs与OECs联合培养时，不需丝裂原刺激即能形成克隆球，获得大量Vimentin、GFAP、MAP2、O2、p75NGFR、GFAP、S-100、Synaptosis、Vimentin、Tau(Tau只有人HNSCs+HOECs联合培养时出现阳染)染色阳性的克隆球和细胞；⑦脊髓研磨后的上清液刺激神经干细胞向神经元方向分化，但并不出现终末分化；⑧本研究培养条件不利于成纤维细胞、O4生长。

Iron in the form of ferritin is highly toxic and may cause neural death and reactive gliosis. Astrocytes and microglia are responsible for uptake of excessive CSF iron in superficial siderosis.

星形胶质细胞和小胶质细胞可摄取脑脊液中过多的铁，而铁蛋白中铁的毒性又可导致神经元坏死和反应性神经胶质增生。

In order to investigate the effect of tumor necrosis factor α on the activation of astrocyte, the oligodeoxynucleotide was used to inhibit the production of TNF α from astrocytes stimulated by Coriaria Lactone.

为进一步探讨 TNF-α在星形胶质细胞激活中的作用，用 TNF-α反义寡核苷酸抑制由马桑内酯(coriaria lac-tone，CL )诱导的星形胶质细胞 TNF-α的产生，观察 NFκBp6 5核转位和 IκBα降解的变化。

Results In control group, AQP4 protein and its mRNA were expressed in subpial astrocytes, choroid plexus, ependyma and perivascular astrocytes.

结果AQP4及其mRNA在软脑膜下星形胶质细胞、脉络膜丛、室管膜及血管周围星形胶质细胞胞膜上均有表达。

Neuroglial cells (oligodendrocytes and astrocytes) play a very important role in establishment and maintenance of normal neuronal functions and formation of neurological diseases.

神经胶质细胞（主要是少突胶质细胞和星形胶质细胞）对于正常神经系统功能的建立和维持及神经系统疾病的产生都起着至关重要的作用。传统观念认为大脑功能的唯一发挥者是神经元。

Results In contrast with enzymatic dissociation, the method of mechanical dissociation, breaking up great neurospheres into small spheres with gradually reduced pipette, had advantages of raising cell viability and shortening cell doubling time (P.05). After NSCs being cultured long term in vitro, the number of neurons generated decreased with passaging, whereas the number of astrocytes increased.

体外长期培养条件下，随着培养时间的延长，NSCs分化为神经元的比例逐渐降低，星形胶质细胞的比例逐渐增高；在4~12代NSCs分化为神经元的能力表现出下降的趋势，但仍较为稳定；12代后，神经元的分化比例迅速下降，星形胶质细胞的比例迅速上升。

TCM may modulate the glial cells through the following mechanisms: inhibiting expression of iNOS, thereby minishing the toxicity of NO and its oxygen free radicals; inhibiting overactivation of astrocytes and overexpression of GFAP in acute cerebral ischemia and cerebral hemorrhage; promoting glial cells' secretion of NGF which can be caused by ischemic injury; inhibiting the nervous system's immune inflammatory response; and so on.

中药调节神经胶质细胞活性的机制可能包括：（1）抑制iNOS表达，从而抑制NO及其产生的氧自由基的毒性；（2 抑制脑缺血和脑出血急性期星形胶质细胞的过度活化和GFAP的过度表达；(3)上调缺血损伤导致的神经胶质细胞分泌NGF；(4)抑制神经系统的免疫炎症反应等各种途径。

On the other hand, previously differentiated neuron and astrocyte may also re-express nestin, which may indicate the recovery and plasticity of neuron and astrocyte.

另一方面，已分化的神经元和星形胶质细胞再表达胚胎期蛋白nestin，可能有利于神经元和星形胶质细胞修复。

GFAP+ astrocytes hhd no changes and there were no VIM+ astrocytes surrounding wounds in postmortem groups.

死后脑干损伤组GFAP+星形胶质细胞无改变，创缘及创周无VIM+星形胶质细胞出现。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。