ال الكتاب ممتنون للدماغ والعمود الفقري الإنسان مركز الموارد الموائع (لوس أنجلوس، CA) لتوفير عينات الدماغ العادي. وأيد هذه الدراسة من قبل المعاهد الوطنية للصحة (NIH) R01NS062787، ومؤسسة CJD بالأمان البيولوجي، التحالف، فضلا عن مركز جامعة للشيخوخة والصحة بدعم من مؤسسة ماكجريجور وصندوق الرئيس الكمالية (كيس ويسترن ريزرف) .

<ol>
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B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+of+a+protein+that+purifies+with+the+scrapie+prion.">Identification of a protein that purifies with the scrapie prion.</a> Science. 218, 1309-1311 (1982).</li><li>Prusiner, S. B., McKinley, M. P., Bowman, K. A., Bolton, D. C., Bendheim, P. E., Groth, D. F., Glenner, G. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Scrapie+prions+aggregate+to+form+amyloid-like+birefringent+rods.">Scrapie prions aggregate to form amyloid-like birefringent rods.</a> Cell. 35, 349-358 (1983).</li><li>Hope, J., Morton, L. J., Farquhar, C. F., Multhaup, G., Beyreuther, K., Kimberlin, R. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+major+polypeptide+of+scrapie-associated+fibrils+(SAF)+has+the+same+size,+charge+distribution+and+N-terminal+protein+sequence+as+predicted+for+the+normal+brain+protein+(PrP).">The major polypeptide of scrapie-associated fibrils (SAF) has the same size, charge distribution and N-terminal protein sequence as predicted for the normal brain protein (PrP).</a> EMBO J. 5, 2591-2597 (1986).</li><li>Prusiner, S. B., Groth, D. F., Bolton, D. C., Kent, S. B., Hood, L. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Purification+and+structural+studies+of+a+major+scrapie+prion+protein.">Purification and structural studies of a major scrapie prion protein.</a> Cell. 38, 127-134 (1984).</li><li>Hall, D., Edskes, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Silent+prions+lying+in+wait:+a+two-hit+model+of+prion/amyloid+formation+and+infection.">Silent prions lying in wait: a two-hit model of prion/amyloid formation and infection.</a> J. Mol. Biol. 336, 775-786 (2004).</li><li>Yuan, J., Xiao, X., McGeehan, J., Dong, Z., Cali, I., Fujioka, H., Kong, Q., Kneale, G., Gambetti, P., Zou, W. Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Insoluble+aggregates+and+protease-resistant+conformers+of+prion+protein+in+uninfected+human+brains.">Insoluble aggregates and protease-resistant conformers of prion protein in uninfected human brains.</a> J. Biol. Chem. 281, 34848-34858 (2006).</li><li>Yuan, J., Dong, Z., Guo, J. P., McGeehan, J., Xiao, X., Wang, J., Cali, I., McGeer, P. L., Cashman, N. R., Bessen, R., Surewicz, W. K., Kneale, G., Petersen, R. B., Gambetti, P., Zou, W. Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Accessibility+of+a+critical+prion+protein+region+involved+in+strain+recognition+and+its+implications+for+the+early+detection+of+prions.">Accessibility of a critical prion protein region involved in strain recognition and its implications for the early detection of prions.</a> Cell. Mol. Life Sci. 65, 631-643 (2008).</li><li>Zou, W. Q., Zheng, J., Gray, D. M., Gambetti, P., Chen, S. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Antibody+to+DNA+detects+scrapie+but+not+normal+prion+protein.">Antibody to DNA detects scrapie but not normal prion protein.</a> Proc. Natl. Acad. Sci. U.S.A. 101, 1380-1385 (2004).</li><li>Gambetti, P., Dong, Z., Yuan, J., Xiao, X., Zheng, M., Alshekhlee, A., Castellani, R., Cohen, M., Barria, M. A., Gonzalez-Romero, D., Belay, E. D., Schonberger, L. B., Marder, K., Harris, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+human+disease+with+abnormal+prion+protein+sensitive+to+protease.">A novel human disease with abnormal prion protein sensitive to protease.</a> Ann. Neurol. 63, 697-708 (2008).</li><li>Zou, W. Q., Puoti, G., Xiao, X., Yuan, J., Qing, L., Cali, I., Shimoji, M., Langeveld, J. P., Castellani, R., Notari, S., Crain, B., Schmidt, R. E., Geschwind, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Variably+protease-sensitive+prionopathy:+A+new+sporadic+disease+of+the+prion+protein.">Variably protease-sensitive prionopathy: A new sporadic disease of the prion protein.</a> Ann. Neurol. 68, 162-172 (2010).</li><li>Zou, W. Q., Xiao, X., Yuan, J., Puoti, G., Fujioka, H., Wang, X., Richardson, S., Zhou, X., Zou, R., Li, S., Zhu, X. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Amyloid-beta42+interacts+mainly+with+insoluble+prion+protein+in+the+Alzheimer+brain.">Amyloid-beta42 interacts mainly with insoluble prion protein in the Alzheimer brain.</a> J. Biol. Chem. 286, 15095-15105 (2011).</li><li>Zou, W. Q., Colucci, M., Gambetti, P., Chen, S. G., Potter, N. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+prion+proteins.">Characterization of prion proteins.</a> Methods in Molecular Biology-Neurogenetics: Methods and Protocols. , 305-314 (2002).</li><li>Tzaban, S., Friedlander, G., Schonberger, O., Horonchik, L., Yedidia, Y., Shaked, G., Gabizon, R., Taraboulos, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protease-sensitive+scrapie+prion+protein+in+aggregates+of+heterogeneous+sizes.">Protease-sensitive scrapie prion protein in aggregates of heterogeneous sizes.</a> Biochemistry. 41, 12868-12875 (2002).</li></ol>

الإعلان عن أي تضارب في المصالح.

مزيج من النهج ذكرت هنا غير قابلة للذوبان يعزل باستمرار بي ار بي المجاميع C وقابل للذوبان oligomers بي ار بي C من دماغ الإنسان العادي. تنبيذ فائق في 100،000 x ج لمدة ساعة واحدة هو أسلوب الكلاسيكية التي استخدمت على نطاق واسع لفصل برأسية غير قابلة للذوبان بي ار ب?...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> اسم كاشف </td><td> شركة </td><td> كتالوج رقم </td><td> التعليقات (اختياري) </td></tr><tr><td> Phenylmethylsulfonyl فلوريد </td><td> سيغما الدريخ </td><td> P7626 </td><td> 72 مم في بروبانول-2 </td></tr><tr><td> بروتين K </td><td> سيغما الدريخ </td><td> P2308 </td><td> 2 ملغ / مل في H 2 O </td></tr><tr><td> PNGase F </td><td> نيو انغلاند Biolabs </td><td> MWGF200 </td><td></td></tr><tr><td> LE-80K نابذة فائقة السرعة، SW55 الدوار </td><td> بيكمان كولتر </td><td> الجزء رقم 365668، 356860 </td><td></td></tr><tr><td> Superdex 200 HR الخرز </td><td> GE للرعاية الصحية </td><td> 17-1088-01 </td><td></td></tr><tr><td> AKTA FPLC النظام </td><td> GE للرعاية الصحية </td><td> 18-1900-26 </td><td></td></tr><tr><td> علامات الوزن الجزيئي </td><td> سيغما الدريخ </td><td> MWGF200 </td><td> تباينت </td></tr><tr><td> Dynabeads M-280 الخرز المغناطيسي </td><td> إينفيتروجن </td><td> 143-01 </td><td></td></tr><tr><td> 3F4 الأجسام المضادة </td><td> كوفانس </td><td> SIG-39600 </td><td></td></tr><tr><td> 1E4 الأجسام المضادة </td><td> خلية العلوم </td><td> M1840 </td><td></td></tr><tr><td> هلام استعداد 15٪ تريس، حمض الهيدروكلوريك مسبقة الصب المواد الهلامية </td><td> بيو راد </td><td> 345-0020 </td><td></td></tr></tbody></table>

isolation of soluble and insoluble prp oligomers in the normal human brain

الحدث المركزي في التسبب في الأمراض البريونية ينطوي على تحويل المضيف ترميز البروتين بي ار بي الخلوية بريون C المسببة للأمراض في شكل الإسوي في بي ار بي SC 1. بي ار بي C هو المنظفات للذوبان وبروتين حساسة للK (PK)-الهضم، في حين تشكل المنظفات بي ار بي برأسية غير قابلة للذوبان المجاميع ومقاومة جزئيا إلى PK 2-6. ومن المعروف أن تحويل C بي ار بي بي ار بي إلى اتفاقية استكهولم لإشراك الانتقال بتكوين لα β-حلزونية لورقة هياكل البروتين. ومع ذلك، لا تزال في مسار الجسم الحي غير مفهومة. A الذاتية مؤقت بي ار بي برأسية والمتوسطة * بي ار بي أو &quot;بريون الصمت&quot;، لم يتم بعد تحديدها في الدماغ غير مصاب 7. باستخدام مزيج من النهج البيوفيزيائية والكيمياء الحيوية، وحددنا المجاميع غير قابلة للذوبان بي ار بي C (C iPrP المعينة) من أدمغة الثدييات غير مصاب ومثقف الخلايا العصبيةخلايا 8 و 9. هنا، نحن تصف الإجراءات التفصيلية لهذه الأساليب، بما في ذلك في تنبيذ فائق العازلة المنظفات والترسيب السكروز التدرج خطوة، وحجم الإقصاء اللوني، iPrP تخصيب اليورانيوم بحلول البروتين الجيني 5 (g5p) التي تربط خصيصا لأشكال بي ار بي تغيير هيكليا 10، وPK المعاملة. مزيج من هذه الأساليب ليس فقط غير قابلة للذوبان يعزل بي ار بي بي ار بي برأسية والمجاميع C ولكن أيضا للذوبان بي ار بي oligomers C من دماغ الإنسان العادي. منذ بروتوكولات الموصوفة هنا قد استخدمت لعزل كل من بي ار بي برأسية من العقول المصابة وiPrP C من العقول غير مصاب، لأنها توفر لنا فرصة لمقارنة الاختلافات في الميزات الفيزيائية، السمية العصبية، والعدوى بين الأشكال الإسوية اثنين. ومثل هذه الدراسة تحسن كثيرا فهمنا لمسببات الأمراض المعدية والبروتينية. علم وظائف الأعضاء والفيزيولوجيا المرضية للC iPrP غير واضحة في الوقت الحاضر. والجدير بالذكر أن في A-ID حديثاوجدنا entified المرض البريوني البشري ووصف بنسب مختلفة البروتيني حساسة prionopathy، جديد برأسية بي ار بي أن تشارك سلوك متفاعل مناعيا وتجزئة C مع iPrP 11 و 12. وعلاوة على ذلك، ونحن في الآونة الأخيرة أظهرت أن iPrP C هو أهم الأنواع التي تتفاعل مع بروتين اميلويد β في مرض الزهايمر 13. في نفس الدراسة، تم استخدام هذه الأساليب لعزل المجاميع Abeta وoligomers في مرض الزهايمر 13، مما يدل تطبيقها على المجاميع البروتين غير بريون المشاركة في الاضطرابات العصبية الأخرى.

Watch this Scientific Journal Video about Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain at JoVE.com

Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain

نوع جديد من بروتين بريون الخلوي (بي ار بي<sup&gt; C</sup&gt;) وقد تم مؤخرا المحددة في العقول البشرية غير مصاب باستخدام الأساليب المذكورة هنا. ويمكن استخدام هذه الأساليب لعزل الأنواع المختلفة بي ار بي، في حين أن بعض من هم من المفيد أيضا في عزل المجاميع الأخرى من البروتين تتجمع العقول البشرية.

عزل Oligomers بي ار بي القابلة للذوبان وغير القابلة للذوبان في دماغ الإنسان العادي

The central event in the pathogenesis of prion diseases involves a conversion of the host-encoded cellular prion protein PrPC into its pathogenic isoform ...

isolation-soluble-insoluble-prp-oligomers-normal-human

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10.7K Views.  Case Western Reserve University School of Medicine. نوع جديد من بروتين بريون الخلوي (بي ار بي C) وقد تم مؤخرا المحددة في العقول البشرية غير مصاب باستخدام الأساليب المذكورة هنا. ويمكن استخدام هذه الأساليب لعزل الأنواع المختلفة بي ار بي، في حين أن بعض من هم من المفيد أيضا في عزل المجاميع الأخرى من البروتين ت?...

Video: Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain

Identification and Isolation of Slow-Dividing Cells in Human Glioblastoma Using Carboxy Fluorescein Succinimidyl Ester (CFSE)

Tumor heterogeneity represents a fundamental feature supporting tumor robustness and presents a central obstacle to the development of therapeutic strategies1. To overcome the issue of tumor heterogeneity, it is essential to develop assays and tools enabling phenotypic, (epi)genetic and functional identification and characterization of tumor subpopulations that drive specific disease pathologies and represent clinically relevant targets. It is now well established that tumors exhibit distinct sub-fractions of cells with different frequencies of cell division, and that the functional criteria of being slow cycling is positively associated with tumor formation ability in several cancers including those of the brain, breast, skin and pancreas as well as leukemia2-8. The fluorescent dye carboxyfluorescein succinimidyl ester (CFSE) has been used for tracking the division frequency of cells in vitro and in vivo in blood-borne tumors and solid tumors such as glioblastoma2,7,8. The cell-permeant non-fluorescent pro-drug of CFSE is converted by intracellular esterases into a fluorescent compound, which is retained within cells by covalently binding to proteins through reaction of its succinimidyl moiety with intracellular amine groups to form stable amide bonds9. The fluorescent dye is equally distributed between daughter cells upon divisions, leading to the halving of the fluorescence intensity with every cell division. This enables tracking of cell cycle frequency up to eight to ten rounds of division10. CFSE retention capacity was used with brain tumor cells to identify and isolate a slow cycling subpopulation (top 5% dye-retaining cells) demonstrated to be enriched in cancer stem cell activity2. 
This protocol describes the technique of staining cells with CFSE and the isolation of individual populations within a culture of human glioblastoma (GBM)-derived cells possessing differing division rates using flow cytometry2. The technique has served to identify and isolate a brain tumor slow-cycling population of cells by virtue of their ability to retain the CFSE labeling.

Identification and Isolation of Slow-Dividing Cells in Human Glioblastoma Using Carboxy Fluorescein Succinimidyl Ester CFSE

This video protocol demonstrates the application of the fluorescent dye carboxyfluorescein succinimidyl ester (CFSE) for the identification and separation of different sub-populations of cells in human glioblastoma based on frequency of cell division.

تحديد وعزل بطيئة تقسيم الخلايا في الإنسان عن طريق ورم أرومي دبقي كربوكسي فلوريسئين Succinimidyl استر (CFSE)

Tumor heterogeneity represents a fundamental feature supporting tumor robustness and presents a central obstacle to the development of therapeutic ...

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease

Parkinson's disease (PD) is the second most common movement disorder and affects 1% of people over the age of 60 1. Because ageing is the most important risk factor, cases of PD will increase during the next decades 2. Next to pathological protein folding and impaired protein degradation pathways, alterations of mitochondrial function and morphology were pointed out as further hallmark of neurodegeneration in PD 3-11.
After years of research in murine and human cancer cells as in vitro models to dissect molecular pathways of Parkinsonism, the use of human fibroblasts from patients and appropriate controls as ex vivo models has become a valuable research tool, if potential caveats are considered. Other than immortalized, rather artificial cell models, primary fibroblasts from patients carrying disease-associated mutations apparently reflect important pathological features of the human disease.
Here we delineate the procedure of taking skin biopsies, culturing human fibroblasts and using detailed protocols for essential microscopic techniques to define mitochondrial phenotypes. These were used to investigate different features associated with PD that are relevant to mitochondrial function and dynamics. Ex vivo, mitochondria can be analyzed in terms of their function, morphology, colocalization with lysosomes (the organelles degrading dysfunctional mitochondria) and degradation via the lysosomal pathway. These phenotypes are highly relevant for the identification of early signs of PD and may precede clinical motor symptoms in human disease-gene carriers. Hence, the assays presented here can be utilized as valuable tools to identify pathological features of neurodegeneration and help to define new therapeutic strategies in PD.

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson&#039;s Disease

Fibroblasts from patients carrying mutations in Parkinson's disease-causing genes represent an easily accessible ex vivo model to study disease-associated phenotypes. Live cell imaging gives the opportunity to study morphological and functional parameters in living cells. Here we describe the preparation of human fibroblasts and subsequent monitoring of mitochondrial phenotypes.

استخدام الخلايا الليفية الإنسان الأساسية لرصد نمط ظاهري الميتوكوندريا في مجال مرض باركنسون

Parkinson's disease (PD) is the second most  common movement disorder and affects 1% of people over the age of 60 1. Because ageing is  the most important ...

Lesion Explorer: A Video-guided, Standardized Protocol for Accurate and Reliable MRI-derived Volumetrics in Alzheimer's Disease and Normal Elderly

Obtaining in vivo human brain tissue volumetrics from MRI is often complicated by various technical and biological issues. These challenges are exacerbated when significant brain atrophy and age-related white matter changes (e.g. Leukoaraiosis) are present. Lesion Explorer (LE) is an accurate and reliable neuroimaging pipeline specifically developed to address such issues commonly observed on MRI of Alzheimer's disease and normal elderly. The pipeline is a complex set of semi-automatic procedures which has been previously validated in a series of internal and external reliability tests1,2. However, LE's accuracy and reliability is highly dependent on properly trained manual operators to execute commands, identify distinct anatomical landmarks, and manually edit/verify various computer-generated segmentation outputs.
LE can be divided into 3 main components, each requiring a set of commands and manual operations: 1) Brain-Sizer, 2) SABRE, and 3) Lesion-Seg. Brain-Sizer's manual operations involve editing of the automatic skull-stripped total intracranial vault (TIV) extraction mask, designation of ventricular cerebrospinal fluid (vCSF), and removal of subtentorial structures. The SABRE component requires checking of image alignment along the anterior and posterior commissure (ACPC) plane, and identification of several anatomical landmarks required for regional parcellation. Finally, the Lesion-Seg component involves manual checking of the automatic lesion segmentation of subcortical hyperintensities (SH) for false positive errors.
While on-site training of the LE pipeline is preferable, readily available visual teaching tools with interactive training images are a viable alternative. Developed to ensure a high degree of accuracy and reliability, the following is a step-by-step, video-guided, standardized protocol for LE's manual procedures.

Lesion Explorer: A Video-guided, Standardized Protocol for Accurate and Reliable MRI-derived Volumetrics in Alzheimer&#039;s Disease and Normal Elderly

Lesion Explorer (LE) is a semi-automatic, image-processing pipeline developed to obtain regional brain tissue and subcortical hyperintensity lesion volumetrics from structural MRI of Alzheimer's disease and normal elderly. To ensure a high level of accuracy and reliability, the following is a video-guided, standardized protocol for LE's manual procedures.

الآفة إكسبلورر: A، بروتوكول موحد موجهة الفيديو لدقة الحجمي وموثوق بها التصوير بالرنين المغناطيسي المستمدة في مرض الزهايمر والمسنين عادي

Obtaining in vivo human brain tissue volumetrics from MRI is often complicated by various technical and biological issues. These challenges are ...

In Vivo Optical Imaging of Brain Tumors and Arthritis Using Fluorescent SapC-DOPS Nanovesicles

We describe a multi-angle rotational optical imaging (MAROI) system for in vivo monitoring of physiopathological processes labeled with a fluorescent marker. Mouse models (brain tumor and arthritis) were used to evaluate the usefulness of this method. Saposin C (SapC)-dioleoylphosphatidylserine (DOPS) nanovesicles tagged with CellVue Maroon (CVM) fluorophore were administered intravenously. Animals were then placed in the rotational holder (MARS) of the in vivo imaging system. Images were acquired in 10&#176; steps over 380&#176;. A rectangular&#160;region of interest (ROI) was placed across the full image width at the model disease site. Within the ROI, and for every image, mean fluorescence intensity was computed after background subtraction. In the mouse models studied, the labeled nanovesicles were taken up in both the orthotopic and transgenic brain tumors, and in the arthritic sites (toes and ankles). Curve analysis of the multi angle image ROIs determined the angle with the highest signal. Thus, the optimal angle for imaging each disease site was characterized. The MAROI method applied to imaging of fluorescent compounds is a noninvasive, economical, and precise tool for in vivo quantitative analysis of the disease states in the described mouse models.

In Vivo Optical Imaging of Brain Tumors and Arthritis Using Fluorescent SapC-DOPS Nanovesicles

We describe a multi-angle rotational optical imaging (MAROI) system for in vivo quantitation of a fluorescent marker delivered by saposin C (SapC)-dioleoylphosphatidylserine (DOPS) nanovesicles. Employing mouse models of cancer and arthritis, we demonstrate how the MAROI signal curve analysis can be used for the precise mapping and biological characterization of disease processes.

في فيفو التصوير الضوئي من أورام الدماغ والتهاب المفاصل عن طريق نيون SapC-DOPS Nanovesicles

We describe a multi-angle rotational optical imaging (MAROI) system for in vivo monitoring of physiopathological processes labeled with a fluorescent ...

Excitotoxic Stimulation of Brain Microslices as an In vitro Model of Stroke

Examining molecular mechanisms involved in neuropathological conditions, such as ischemic stroke, can be difficult when using whole animal systems. As such, primary or &#39;neuronal-like&#39; cell culture systems are commonly utilized. While&#160;these systems are relatively easy to work with, and are useful model systems in which various functional outcomes (such as cell death) can be readily quantified, the examined outcomes and pathways in cultured immature neurons (such as excitotoxicity-mediated cell death pathways) are not necessarily the same as those observed in mature brain, or in intact tissue. Therefore, there is the need to develop models in which cellular mechanisms in mature neural tissue can be examined. We have developed an in vitro technique that can be used to investigate a variety of molecular pathways in intact nervous tissue. The technique described herein utilizes rat cortical tissue, but this technique can be adapted to use tissue from a variety of species (such as mouse, rabbit, guinea pig, and chicken) or brain regions (for example, hippocampus, striatum, etc.). Additionally, a variety of stimulations/treatments can be used (for example, excitotoxic, administration of inhibitors, etc.). In conclusion, the brain slice model described herein can be used to examine a variety of molecular mechanisms involved in excitotoxicity-mediated brain injury.

Excitotoxic Stimulation of Brain Microslices as an In vitro Model of Stroke

We have developed a brain slice model which can be used to examine molecular mechanisms involved in excitotoxicity-mediated brain injury.&#160;This technique generates viable mature brain tissue and reduces animal numbers required for experimentation, whilst keeping the neuronal circuitry, cellular interactions, and postsynaptic compartments partly intact.

excitotoxic المواد تحفيز الدماغ باعتبارها Microslices<em&gt; في المختبر</em&gt; نموذج من السكتة الدماغية

Examining molecular mechanisms involved in neuropathological conditions, such as ischemic stroke, can be difficult when using whole animal systems. As ...

Multi-electrode Array Recordings of Human Epileptic Postoperative Cortical Tissue

Epilepsy, affecting about 1% of the population, comprises a group of neurological disorders characterized by the periodic occurrence of seizures, which disrupt normal brain function. Despite treatment with currently available antiepileptic drugs targeting neuronal functions, one third of patients with epilepsy are pharmacoresistant. In this condition, surgical resection of the brain area generating seizures remains the only alternative treatment. Studying human epileptic tissues has contributed to understand new epileptogenic mechanisms during the last 10 years. Indeed, these tissues generate spontaneous interictal epileptic discharges as well as pharmacologically-induced ictal events which can be recorded with classical electrophysiology techniques. Remarkably, multi-electrode arrays (MEAs), which are microfabricated devices embedding an array of spatially arranged microelectrodes, provide the unique opportunity to simultaneously stimulate and record field potentials, as well as action potentials of multiple neurons from different areas of the tissue. Thus MEAs recordings offer an excellent approach to study the spatio-temporal patterns of spontaneous interictal and evoked seizure-like events and the mechanisms underlying seizure onset and propagation. Here we describe how to prepare human cortical slices from surgically resected tissue and to record with MEAs interictal and ictal-like events ex vivo.

We here describe how to perform multi-electrode array recordings of human epileptic cortical tissue. Epileptic tissue resection, slice preparation and multi-electrode array recordings of interictal and ictal events are demonstrated in detail.

متعدد القطب تسجيلات صفيف من داء الصرع بعد الجراحة القشرية الأنسجة البشرية

Epilepsy, affecting about 1% of the population, comprises a group of neurological disorders characterized by the periodic occurrence of seizures, which ...

Isolation, Cryopreservation and Culture of Human Amnion Epithelial Cells for Clinical Applications

Human amnion epithelial cells (hAECs) derived from term or pre-term amnion membranes have attracted attention from researchers and clinicians as a potential source of cells for regenerative medicine. The reason for this interest is evidence that these cells have highly multipotent differentiation ability, low immunogenicity, and anti-inflammatory functions. These properties have prompted researchers to investigate the potential of hAECs to be used to treat a variety of diseases and disorders in pre-clinical animal studies with much success.
hAECs have found widespread application for the treatment of a range of diseases and disorders. Potential clinical applications of hAECs include the treatment of stroke, multiple sclerosis, liver disease, diabetes and chronic and acute lung diseases. Progressing from pre-clinical animal studies into clinical trials requires a higher standard of quality control and safety for cell therapy products. For safety and quality control considerations, it is preferred that cell isolation protocols use animal product-free reagents. 
We have developed protocols to allow researchers to isolate, cryopreserve and culture hAECs using animal product-free reagents. The advantage of this method is that these cells can be isolated, characterized, cryopreserved and cultured without the risk of delivering potentially harmful animal pathogens to humans, while maintaining suitable cell yields, viabilities and growth potential. For researchers moving from pre-clinical animal studies to clinical trials, these methodologies will greatly accelerate regulatory approval, decrease risks and improve the quality of their therapeutic cell population.

We describe a protocol to isolate and culture human amnion epithelial cells (hAECs) using animal product-free reagents in accordance with current good manufacturing practices (cGMP) guidelines.

العزلة، والحفظ بالتبريد والثقافة من الخلايا الظهارية البشرية السلى للتطبيقات السريرية

Human amnion epithelial cells (hAECs) derived from term or pre-term amnion membranes have attracted attention from researchers and clinicians as a ...

Isolation of Human Lymphatic Endothelial Cells by Multi-parameter Fluorescence-activated Cell Sorting

Lymphatic system disorders such as primary lymphedema, lymphatic malformations and lymphatic tumors are rare conditions that cause significant morbidity but little is known about their biology. Isolating highly pure human lymphatic endothelial cells (LECs) from diseased and healthy tissue would facilitate studies of the lymphatic endothelium at genetic, molecular and cellular levels. It is anticipated that these investigations may reveal targets for new therapies that may change the clinical management of these conditions. A protocol describing the isolation of human foreskin LECs and lymphatic malformation lymphatic endothelial cells (LM LECs) is presented. To obtain a single cell suspension tissue was minced and enzymatically treated using dispase II and collagenase II. The resulting single cell suspension was then labelled with antibodies to cluster of differentiation (CD) markers CD34, CD31, Vascular Endothelial Growth Factor-3 (VEGFR-3) and PODOPLANIN. Stained viable cells were sorted on a fluorescently activated cell sorter (FACS) to separate the CD34LowCD31PosVEGFR-3PosPODOPLANINPos LM LEC population from other endothelial and non-endothelial cells. The sorted LM LECs were cultured and expanded on fibronectin-coated flasks for further experimental use.

The goal of this protocol is to isolate lymphatic endothelial cells lining human lymphatic malformation cyst-like vessels and foreskins using fluorescence-activated cell sorting (FACS). Subsequent cell culturing and expansion of these cells permits a new level of experimental sophistication for genetic, proteomic, functional and cell differentiation studies.

عزل خلايا الإنسان اللمفاوي البطانية التي كتبها متعدد المعلمة تنشيط الإسفار الفرز خلية

Lymphatic system disorders such as primary lymphedema, lymphatic malformations and lymphatic tumors are rare conditions that cause significant morbidity ...

Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function

The oculomotor system involves a large number of brain areas including parts of the basal ganglia, and various neurodegenerative diseases including Parkinson's and Huntington's can disrupt it. People with Parkinson's disease, for example, tend to have increased saccadic latencies. Consequently, the quantitative measurement of saccadic eye movements has received considerable attention as a potential biomarker for neurodegenerative conditions. A lot more can be learned about the brain in both health and disease by observing what happens to eye movements when the function of specific brain areas is perturbed. Deep brain stimulation is a surgical intervention used for the management of a range of neurological conditions including Parkinson's disease, in which stimulating electrodes are placed in specific brain areas including several sites in the basal ganglia. Eye movement measurements can then be made with the stimulator systems both off and on and the results compared. With suitable experimental design, this approach can be used to study the pathophysiology of the disease being treated, the mechanism by which DBS exerts it beneficial effects, and even aspects of normal neurophysiology.

This paper describes the use of quantitative measurement of eye movements in conjunction with stimulation of focal areas of the deep brain in order to study physiology, pathophysiology, and the mechanisms of deep brain stimulation.

باستخدام Saccadometry مع ديب تحفيز الدماغ لدراسة العادية والمرضية وظيفة الدماغ

The oculomotor system involves a large number of brain areas including parts of the basal ganglia, and various neurodegenerative diseases including ...

Mechanical and Controlled PRP Injections in Patients Affected by Androgenetic Alopecia

23 patients (18 male and 5 female) aged 21-70 years who displayed male pattern hair loss (MPHL) in Stage 1 to Stage 5 as determined by the Norwood-Hamilton classification scale, and female pattern hair loss (FPHL) in Stage 1 to Stage 2 as determined by the Ludwig classification scale, were treated with non-activated autologous platelet-rich plasma (A-PRP). Autologous blood (55 mL) was harvested using sodium citrate as an anticoagulant. A-PRP (23 mL) was produced for all cases using a closed system according to the transfusion service protocol. Following centrifugation (260 x g for 10 min) the A-PRP was inserted in a laser light selector device, and after the centrifugation, 9 mL of A-PRP was collected.
The scalp of the patients affected by androgenetic alopecia (AGA) was divided into four areas (frontal, parietal, vertex, and occipital); local anesthesia was not performed. Interfollicular A-PRP injections (0.2 mL x cm2) were performed by controlled and mechanical injections scheduled at a depth of 5 mm using a medical injector gun. Treatment sessions were performed with a 30-day interval. For each patient, three treatment sessions were performed.
PRP was injected in the androgen-related areas of scalp affected by hair loss. Placebo (normal saline solution) was loaded in another syringe (10 mL) and injected on the adjacent side in a similar fashion.

This paper aims to describe the interfollicular autologous platelet-rich plasma injections (0.20 mL x cm2) in the scalp of 23 patients affected by androgenetic alopecia at a depth of 5 mm using a medical injector gun equipped with a 30 gauge needle, in three sessions.