המחברים מבקשים להודות Ikiel Ptito לקבלת תמיכה טכנית המשיכה שלו. NSERC להעניק MP.

חלק 1: טרום עיבוד של רקמות <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> רקמות צריך להיות perfused היטב עם paraformaldehyde, glutaraldehyde, או פורמלין. זו יכולה להיות מושגת באמצעות זלוף transcardial הסטנדרטית המשמשת בדרך כלל כדי לקצור איברים אחרים. במחקר הנוכחי הנושא היה מורדמת עם קטמין הידרוכלוריד (10 מ&quot;ג / ק&quot;ג, IM), מורדמים עם ממנת יתר של pentobarbital נתרן (25 מ&quot;ג / ק&quot;ג, ד) ו perfused transcardially עם 0.1 מ PBS עד לחלוטין exsanguinated.This לאחר מכן על ידי פתרון paraformaldehyde 4% PBS דקות 5 (~ 1 ליטר). </li></ol> חלק 2: חסימת Stereotaxic <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> לפני הנחת הראש לתוך מסגרת stereotaxic את הקואורדינטות של אפס המטוס Horsley-Clarke/interaural צריך לקחת. זוהי נקודת האמצע התיאורטי בין האוזניים. כדי למדוד את המטוס הזה, הברים האוזן צריך להיות מצויד לא פחות במנגנון, אז במקום להב אזמל בזרוע מניפולטור stereotaxic ולמדוד את נקודת האמצע בין הסורגים האוזן. זה חשוב לקביעת שם כדי לחסום את רקמת המבוססים על צרכי המחקר. ברגע זה הוא סיים הגולגולת צריך להיות מוכן קיבעון לתוך המנגנון stereotaxic. </li><li style=";text-align:right;direction:rtl"> כדי למקם את הראש לתוך מסגרת stereotaxic הלסת התחתונה יהיה צורך להסיר עם rongeurs עצם אזמל. בנוסף העור, שרירים, רקמות חיבור יש להסיר כדי לחשוף את הגולגולת. לאחר רקמת חיבור יוסר הגולגולת, לחשוף את המוח על ידי לפורר את מכסה הגולגולת (החלק טבלאי של העצם העורפית וכן הקודקודית, עצמות מודעה חזיתית). בחלק הניסוי הנוכחי של מכסה הגולגולת יש הכל מוכן הוסר. היזהרו לא להסיר לחלוטין את העצמות הטמפורלית כי תעלות האוזן צריך להיות תמים כדי למקם את הראש לתוך מסגרת stereotaxic. עניין הנותרים הדורה יש להסיר מן המוח החשוף. הגולגולת עכשיו הוא מוכן להציב לתוך מסגרת stereotaxic. </li><li style=";text-align:right;direction:rtl"> באותו אופן שבו אפשר היה לבצע ניתוח stereotaxic, להתאים את העין, החיך, וברים האוזן כזה ראש קבוע מאובטח במנגנון stereotaxic. מניחים את מניפולטור stereotaxic את הקואורדינטות קדמית / אחורית (A / P) מראש ולהעביר את מניפולטור להיבט לרוחב של המוח. לאט לאט להוריד את הלהב לתוך המוח, להעלות את הלהב לחלוטין מהמוח, ואז להעביר מדיאלית ולהפחית את הלהב שוב. חזור על שני השלבים עד הלהב הגיע היבט לרוחב של חצי הכדור ההפוך. זה משלים את הבלוק העטרה הראשונה. עבור בלוקים העטרה לאחר מכן להעביר את 1cm מניפולטור של ציר P / וחזור עד המוח כולו נחסם. </li></ol> חלק 3: הסרת המוח מהגולגולת <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> הסר את הראש מן המסגרת stereotaxic והחזק את המוח נחשף כף היד שלך. נסו לאבטח את המוח על ידי הצבת קלות למעוך את המוח בכף ידך מקום אצבע הזרת שלך על פני האונות המצחיות, תנועה זו מקטינה של המוח בגולגולת. על מנת למנוע את התייבשות פני השטח pial של המוח, במקום פיסת גזה לחה PBS ברחבי המוח. החזק את הראש בחוזקה על ידי הגולגולת לכרסם עצמות העורפית ובזמן הנותר יחד עם עמוד השדרה. זה חושף את הבסיס לרוחב היבטים של המוח. לבסוף להסיר כל העצם הפרונטלית הנותרים ואת עצם האף, אשר יאפשר גישה נורות חוש הריח. חשוב להסיר את העצם הקדמית האחרון כי כמו שתסיר את בסיס הגולגולת במוח נע מעט האונות הקדמיות יכולה להתקלקל על קצוות משוננים של העצם fontal. לחתוך ולהסיר הנותרים משנה הדורה. הרם בזהירות את הקדמי של המוח, החלק את אזמל תחת המוח לשחרר את המוח מהגולגולת. </li></ol> חלק 4: מדידות <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> ישנם מספר של מדידות שימושי יכול להתבצע לפני ההקפאה. לדוגמה, A / P ציר של המוח עם קליפר. יתר על צפיפות מסוימת ניתן למדוד על ידי שקילה המוח, מדידת נפח ידי עקירה של מים בתוך גליל סיימה אז חלוקת המשקל על ידי עקירה נפח (טבלה 1). </li></ol> חלק 5: סיום חוסמים את המוח. <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> בדרך כלל כאשר להב סכין המנתחים מוחדר לתוך המוח זה לא מספיק זמן כדי לחדור לחלוטין את מלוא הגבי-הגחוני של המוח. ברגע שהמוח מוסר ומידות ברוטו מתקבלים, לקחת סכין חיתוך רקמות ולסיים חוסמים את המוח דרך בצד הגחוני של המוח (איור 2). </li><li style=";text-align:right;direction:rtl"> לפני הקפאת בלוקים, יש צורך cryoprotect הרקמה ב-PBS שנאגרו פתרונות מדורגים סוכרוז (10, 20, ו 30%) שמרו על 4 ˚ C עד כיורים המוח. זה בדרך כלל לוקח הדגירה לילה 10%, 2-3 ימים 20% נוספים 3-5 ימים 30% עבור אבני לשקוע בתחתית המיכל. שינוי יומי של הפתרון דואר סוכרוז 30% מומלץ. </li></ol> חלק 6: תוצאות נציג ישנם מספר של מדידות מורפולוגיים ברוטו שניתן לעשות פעם את המוח הוסר הגולגולת. אלה כוללים את אורך / P, משקל, צפיפות מסוימת (טבלה 1). בדרך כלל אנחנו חוסמים את המוח תוך 6-7 בלוקים מדידה 1cm (איור 1). כל תכשיט הוא צילם אז (איור 2) ניתן גזור נוספים בהתאם לצורכי מחקר או מוכן להקפאה בפתרונות סוכרוז מדורגים. <table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> נושא </td><td> אורך / P (מ&quot;מ) </td><td> משקל (גרם) </td><td> מים עקירה (מ&quot;ל) </td><td> ספציפיות צפיפות (גרם / מ&quot;ל) </td></tr><tr><td> O2303-2-1-1 </td><td> 64.3 </td><td> 28.1 </td><td> 24 </td><td> 1.171 </td></tr><tr><td> O5180-1 </td><td> 71.3 </td><td> 38.7 </td><td> 34 </td><td> 1.138 </td></tr><tr><td> O2708-3-1 </td><td> 62.8 </td><td> 28.7 </td><td> 26 </td><td> 1.104 </td></tr><tr><td> O9184-4-2 </td><td> 65.3 </td><td> 29.5 </td><td> 24 </td><td> 1.229 </td></tr><tr><td> N459-1-14-2 </td><td> 68.2 </td><td> 31.6 </td><td> 26 </td><td> 1.215 </td></tr><tr><td> ממוצע </td><td> 66.38 </td><td> 31.32 </td><td> 26.8 </td><td> 1.171 </td></tr><tr><td> STD dev </td><td> 3.38 </td><td> 4.33 </td><td> 4.17 </td><td> 0.052 </td></tr></tbody></table> טבלה 1. מדידות מורפולוגי הגולמי של האונה הימנית של 5 Vervets ישן חודש <img src="/files/ftp_upload/1259/1259fig1.jpg" alt="דמות 1" /> <img src="/files/ftp_upload/1259/1259fig2.jpg" alt="דמות 1.5" /> באיור 1. שרטוטים של מטוסים העטרה המשמש חוסמים את המוח. זוהי דוגמה של המוח המבוגר מוחצן vervet. דוגמה של ההליך חוסם. הקווים האנכיים כאן הם במרווחים של 1 ס&quot;מ, בדרך כלל לייצור בלוקים 7 העטרה מן האונה כל. <img src="/files/ftp_upload/1259/1259fig3.jpg" alt="דמות 2" /> איור 2. בלוקים של רקמת המוח בחלל stereotaxic. לחסום כל תניב כ -200 סעיפים נלקחה ב 50μm. בעזרת שיטה זו הדגימה מעל 1200 חלקים דרך קליפת יילקחו ו 400-500 נוספים במוח הקטן, כאשר פרוס במישור העטרה.

<ol>
	<li>Gallagher, M., Rapp, P. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+use+of+animal+models+to+study+the+effects+of+aging+on+cognition.+Annu+Rev+Psychol+48.">The use of animal models to study the effects of aging on cognition. Annu Rev Psychol 48.</a> , 339-370 (1997).</li><li>Clancy, B., Darlington, R., Finlay, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Translating+developmental+time+across+mammalian+species.">Translating developmental time across mammalian species.</a> Neuroscience. 105, 7-17 (2001).</li><li>Nowakowski, R. S., Rakic, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+site+of+origin+and+route+and+rate+of+migration+of+neurons+to+the+hippocampal+region+of+the+rhesus+monkey.">The site of origin and route and rate of migration of neurons to the hippocampal region of the rhesus monkey.</a> J Comp Neurol. 196, 129-154 (1981).</li><li>Rakic, P., Bourgeois, J. P., Eckenhoff, M. F., Zecevic, N., Goldman-Rakic, P. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Concurrent+overproduction+of+synapses+in+diverse+regions+of+the+primate+cerebral+cortex.">Concurrent overproduction of synapses in diverse regions of the primate cerebral cortex.</a> Science. 232, 232-235 (1986).</li><li>Granger, B., Tekaia, F., Le Sourd, A. M., Rakic, P., Bourgeois, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tempo+of+neurogenesis+and+synaptogenesis+in+the+primate+cingulate+mesocortex:+comparison+with+the+neocortex.">Tempo of neurogenesis and synaptogenesis in the primate cingulate mesocortex: comparison with the neocortex.</a> J Comp Neurol. 360, 363-376 (1995).</li><li>Zecevic, N., Rakic, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+layer+I+neurons+in+the+primate+cerebral+cortex.">Development of layer I neurons in the primate cerebral cortex.</a> J Neurosci. 21, 5607-5619 (2001).</li><li>Ervin, F. R., Palmour, R. M., Young, S. N., Guzman-Flores, C., Juarez, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Voluntary+consumption+of+beverage+alcohol+by+vervet+monkeys:+population+screening,+descriptive+behavior+and+biochemical+measures.">Voluntary consumption of beverage alcohol by vervet monkeys: population screening, descriptive behavior and biochemical measures.</a> Pharmacol Biochem Behav. 36, 367-373 (1990).</li><li>Palmour, R. M., Mulligan, J., Howbert, J. J., Ervin, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Of+monkeys+and+men:+vervets+and+the+genetics+of+human-like+behaviors.">Of monkeys and men: vervets and the genetics of human-like behaviors.</a> Am J Hum Genet. 61, 481-488 (1997).</li><li>Boire, D., Th&#233;oret, H., Ptito, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Stereological+evaluation+of+neurons+and+glia+in+the+monkey+dorsal+lateral+geniculate+nucleus+following+an+early+cerebral+hemispherectomy.">Stereological evaluation of neurons and glia in the monkey dorsal lateral geniculate nucleus following an early cerebral hemispherectomy.</a> Exp Brain Res. 142, 208-220 (2002).</li><li>Bjugstad, K. B., Teng, Y. D., Redmond, D. E. J. r., Elsworth, J. D., Roth, R. H., Cornelius, S. K., Snyder, E. Y., Sladek, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+neural+stem+cells+migrate+along+the+nigrostriatal+pathway+in+a+primate+model+of+Parkinson's+disease.">Human neural stem cells migrate along the nigrostriatal pathway in a primate model of Parkinson's disease.</a> Exp Neurol. 211, 362-369 (2008).</li><li>Lemere, C. A., Beierschmitt, A., Iglesias, M., Spooner, E. T., Bloom, J. K., Leverone, J. F., Zheng, J. B., Seabrook, T. J., Louard, D., Li, D., Selkoe, D. J., Palmour, R. M., Ervin, F. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Alzheimer's+disease+abeta+vaccine+reduces+central+nervous+system+abeta+levels+in+a+non-human+primate,+the+Caribbean+vervet.">Alzheimer's disease abeta vaccine reduces central nervous system abeta levels in a non-human primate, the Caribbean vervet.</a> Am J Pathol. 165, 283-297 (2004).</li><li>Mash, D. C., Staley, J. K., Doepel, F. M., Young, S. N., Ervin, F. R., Palmour, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Altered+dopamine+transporter+densities+in+alcohol-preferring+vervet+monkeys.">Altered dopamine transporter densities in alcohol-preferring vervet monkeys.</a> Neuroreport. 7, 457-462 (1996).</li><li>Burke, M. W., Palmour, R. M., Ervin, F. R., Ptito, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neuronal+reduction+in+frontal+cortex+of+primates+after+prenatal+alcohol+exposure.">Neuronal reduction in frontal cortex of primates after prenatal alcohol exposure.</a> Neuroreport. 20, 13-17 (2009).</li></ol>

The authors have nothing to disclose.

סנט קיטס vervet (Chlorocebus aethiops sabeus) הוא קוף עולם ישן עם דפוסים שיעורים דומים של התפתחות המוח הקורטיקליים קורטיקליים לזו של בני האדם. מין זה שימש מודל מורכב הפרעות התנהגות אנושית כמו התנהגות חרדה, יתר לחץ דם 8, 9 hemispherectomy, מחלת פרקינסון 10, מחלת Alzhemier 11, אלכ...

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<td>Scalpel</td>
<td>&nbsp;</td>
<td>Fine Science Tools</td>
<td>10003-12</td>
<td>&nbsp;</td>
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<td>Scalpel blades</td>
<td>&nbsp;</td>
<td>Fine Science Tools</td>
<td>10011-00</td>
<td>&nbsp;</td>
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<td>Scissors</td>
<td>&nbsp;</td>
<td>Fine Science Tools</td>
<td>14090-11</td>
<td>Any surgical scissors are sufficient</td>
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<td>Rongeurs</td>
<td>&nbsp;</td>
<td>Fine Science Tools</td>
<td>16121-14</td>
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<td>Fine Science Tools</td>
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<td>Filter paper</td>
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<td>Fisher</td>
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<td>Stereotaxic Frame</td>
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dissecting the non-human primate brain in stereotaxic space

השימוש הלא אנושי פרימטים מספק מודל translational מצוינת להבנת תהליכים התפתחותיים הזדקנות בבני אדם<sup&gt; 1-6</sup&gt;. בנוסף, השימוש הלא אנושי פרימטים העניקה לאחרונה את ההזדמנות באופן טבעי מודל הפרעות פסיכיאטריות מורכבות כגון שימוש לרעה באלכוהול<sup&gt; 7</sup&gt;. כאן אנו מתארים טכניקה חוסמים את המוח במישור העטרה של הקוף vervet (<em&gt; Chlorocebus aethiops sabeus</em&gt;) בגולגולת שלם בחלל stereotaxic. השיטה המתוארת כאן מספק מטוס סטנדרטי סעיף בין אבני ונושאים וחתכים חלקית ממזער בין הבלוקים. חתך בלוק של רקמות במישור העטרה גם מקל על סימון שטח של עניין. שיטה זו מספקת בלוקים בגודל לניהול מאז חצי כדור יחיד של הקוף vervet תשואות יותר מ 1200 חלקים כאשר חתכה ב 50μm. יתר על כן על ידי חסימת המוח לגושים 1cm, זה מקל על החדירה של סוכרוז עבור cyroprotection ומאפשרת לחסום להיות פרוס על cryostat רגיל.

Watch this Scientific Journal Video about Dissecting the Non-human Primate Brain in Stereotaxic Space at JoVE.com

Dissecting the Non-human Primate Brain in Stereotaxic Space

פרימטים שאינם בני אדם היא מין translational חשוב להבנת עיבוד תקין של המוח. הארגון האנטומי של המוח הפרימטים יכול לספק תובנות חשובות בתנאים נורמליים ופתולוגיים אצל בני אדם.

בניתוח מוח בלתי אנושי הפרימאטים בחלל Stereotaxic

The use of non-human primates provides an excellent translational model for our understanding of developmental and aging processes in humans1-6. In ...

dissecting-the-non-human-primate-brain-in-stereotaxic-space

Research

JoVE Journal

Biology

10.0K Views.  University of Montreal. פרימטים שאינם בני אדם היא מין translational חשוב להבנת עיבוד תקין של המוח. הארגון האנטומי של המוח הפרימטים יכול לספק תובנות חשובות בתנאים נורמליים ופתולוגיים אצל בני אדם.

Video: Dissecting the Non-human Primate Brain in Stereotaxic Space

Survivable Stereotaxic Surgery in Rodents 

The ability to measure extracellular basal levels of neurotransmitters in the brain of awake animals allows for the determination of effects of different systemic challenges (pharmacological or physiological) to the CNS. For example, one can directly measure how the animal's midbrain dopamine projections respond to dopamine-releasing drugs like d-amphetamine or natural stimuli like food. In this video, we show you how to implant guide cannulas targeting specific sites in the rat brain, how to insert and implant a microdialysis probe and how to use high performance liquid chromatography coupled with electrochemical detection (HPLC-EC) to measure extracellular levels of oxidizable neurotransmitters and metabolites. Local precise introduction of drugs through the microdialysis probe allows for refined work on site specificity in a compound s mechanism of action. This technique has excellent anatomical and chemical resolution but only modest time resolution as microdialysis samples are usually processed every 20-30 minutes to ensure detectable neurotransmitter levels. Complementary ex vivo tools (i.e., slice and cell culture electrophysiology) can assist with monitoring real-time neurotransmission.

Survivable Stereotaxic Surgery in Rodents

The monitoring of extracellular neurotransmitter levels in distinct brain regions of freely moving animals offers insights on the link between neurotransmitter release and behavior. In vivo microdialysis coupled with electrochemical detection provides excellent anatomical and chemical resolution; and information on how basal neurotransmission is altered by pharmacological or physiological manipulations.

כירורגיה Stereotaxic לשרוד במכרסמים

The ability to measure extracellular basal levels of neurotransmitters in the brain of awake animals allows for the determination of effects of different ...

Dissecting and Recording from The C. Elegans Neuromuscular Junction

Neurotransmission is the process by which neurons transfer information via chemical signals to their post-synaptic targets, on a rapid time scale. This complex process requires the coordinated activity of many pre- and post-synaptic proteins to ensure appropriate synaptic connectivity, conduction of electrical signals, targeting and priming of secretory vesicles, calcium sensing, vesicle fusion, localization and function of postsynaptic receptors and finally, recycling mechanisms. As neuroscientists it is our goal to elucidate which proteins function in each of these steps and understand their mechanisms of action. Electrophysiological recordings from synapses provide a quantifiable read out of the underlying electrical events that occur during synaptic transmission. By combining this technique with the powerful array of molecular and genetic tools available to manipulate synaptic proteins in C. elegans, we can analyze the resulting functional changes in synaptic transmission. 
The C. elegans NMJs formed between motor neurons and body wall muscles control locomotion, therefore, mutants with uncoordinated locomotory phenotypes (known as unc s) often perturb synaptic transmission at these synapses 1. Since unc mutants are maintained on a rich supply of a bacterial food source, they remain viable as long as they retain some pharyngeal pumping ability to ingest food. This, together with the fact that C. elegans exist as hermaphrodites, allows them to pass on mutant progeny without the need for elaborate mating behaviors. These attributes, coupled with our recent ability to record from the worms NMJs 2,3,7 make this an excellent model organism in which to address precisely how unc mutants impact neurotransmission. 
The dissection method involves immobilizing adult worms using a cyanoacrylic glue in order to make an incision in the worm cuticle exposing the NMJs. Since C. elegans adults are only 1 mm in length the dissection is performed with the use of a dissecting microscope and requires excellent hand-eye coordination. NMJ recordings are made by whole-cell voltage clamping individual body wall muscle cells and neurotransmitter release can be evoked using a variety of stimulation protocols including electrical stimulation, light-activated channel-rhodopsin-mediated depolarization 4 and hyperosmotic saline, all of which will be briefly described.

Application of electrophysiology to accessible synapses provides a quantifiable measure of synaptic activity, useful in analyzing synaptic mutants. This article describes a dissection method used to expose the neuromuscular junctions (NMJ) of Caenorhabditis elegans (C. elegans) and briefly discusses some of the uses to which this preparation can be applied.

הביתור, הקלטה מ צומת C. elegans Neuromuscular

Neurotransmission is the process by which neurons transfer information via chemical signals to their post-synaptic targets, on a rapid time scale.   This ...

The Gateway to the Brain: Dissecting the Primate Eye

The visual system in humans is considered the gateway to the world and plays a principal role in the plethora of sensory, perceptual and cognitive processes. It is therefore not surprising that quality of vision is tied to quality of life . Despite widespread clinical and basic research surrounding the causes of visual disorders, many forms of visual impairments, such as retinitis pigmentosa and macular degeneration, lack effective treatments. Non-human primates have the closest general features of eye development to that of humans. Not only do they have a similar vascular anatomy, but amongst other mammals, primates have the unique characteristic of having a region in the temporal retina specialized for high visual acuity, the fovea1. Here we describe a general technique for dissecting the primate retina to provide tissue for retinal histology, immunohistochemistry, laser capture microdissection, as well as light and electron microscopy. With the extended use of the non-human primate as a translational model, our hope is that improved understanding of the retina will provide insights into effective approaches towards attenuating or reversing the negative impact of visual disorders on the quality of life of affected individuals.

The non-human primate is an important translational species for our understanding of development and aging. The anatomical organization of the primate retina may provide important insights into normal and pathological conditions in humans.

השער המוח: בניתוח עיניים הפרימאטים

The visual system in humans is considered the  gateway  to the world and plays a principal role in the plethora of sensory, perceptual and cognitive ...

Knowing What Counts: Unbiased Stereology in the Non-human Primate Brain

The non-human primate is an important translational species for understanding the normal function and disease processes of the human brain. Unbiased stereology, the method accepted as state-of-the-art for quantification of biological objects in tissue sections2, generates reliable structural data for biological features in the mammalian brain3. The key components of the approach are unbiased (systematic-random) sampling of anatomically defined structures (reference spaces), combined with quantification of cell numbers and size, fiber and capillary lengths, surface areas, regional volumes and spatial distributions of biological objects within the reference space4. Among the advantages of these stereological approaches over previous methods is the avoidance of all known sources of systematic (non-random) error arising from faulty assumptions and non-verifiable models. This study documents a biological application of computerized stereology to estimate the total neuronal population in the frontal cortex of the vervet monkey brain (Chlorocebus aethiops sabeus), with assistance from two commercially available stereology programs, BioQuant Life Sciences and Stereologer (Figure 1). In addition to contrast and comparison of results from both the BioQuant and Stereologer systems, this study provides a detailed protocol for the Stereologer system.

The anatomical organization of the primate brain can provide important insights into normal and pathological conditions in humans. Unbiased stereology is a method for accurately and efficiently estimating the total neuron number (or other cell type) in a given reference space1.

מה שחשוב לדעת: Stereology משוחדת במוח שאינם האדם הפרימאטים

The non-human primate is an important translational species for understanding the normal function and disease processes of the human brain. Unbiased ...

Trajectory Data Analyses for Pedestrian Space-time Activity Study

It is well recognized that human movement in the spatial and temporal dimensions has direct influence on disease transmission1-3. An infectious disease typically spreads via contact between infected and susceptible individuals in their overlapped activity spaces. Therefore, daily mobility-activity information can be used as an indicator to measure exposures to risk factors of infection. However, a major difficulty and thus the reason for paucity of studies of infectious disease transmission at the micro scale arise from the lack of detailed individual mobility data. Previously in transportation and tourism research detailed space-time activity data often relied on the time-space diary technique, which requires subjects to actively record their activities in time and space. This is highly demanding for the participants and collaboration from the participants greatly affects the quality of data4.
Modern technologies such as GPS and mobile communications have made possible the automatic collection of trajectory data. The data collected, however, is not ideal for modeling human space-time activities, limited by the accuracies of existing devices. There is also no readily available tool for efficient processing of the data for human behavior study. We present here a suite of methods and an integrated ArcGIS desktop-based visual interface for the pre-processing and spatiotemporal analyses of trajectory data. We provide examples of how such processing may be used to model human space-time activities, especially with error-rich pedestrian trajectory data, that could be useful in public health studies such as infectious disease transmission modeling.
The procedure presented includes pre-processing, trajectory segmentation, activity space characterization, density estimation and visualization, and a few other exploratory analysis methods. Pre-processing is the cleaning of noisy raw trajectory data. We introduce an interactive visual pre-processing interface as well as an automatic module. Trajectory segmentation5 involves the identification of indoor and outdoor parts from pre-processed space-time tracks. Again, both interactive visual segmentation and automatic segmentation are supported. Segmented space-time tracks are then analyzed to derive characteristics of one's activity space such as activity radius etc. Density estimation and visualization are used to examine large amount of trajectory data to model hot spots and interactions. We demonstrate both density surface mapping6 and density volume rendering7. We also include a couple of other exploratory data analyses (EDA) and visualizations tools, such as Google Earth animation support and connection analysis. The suite of analytical as well as visual methods presented in this paper may be applied to any trajectory data for space-time activity studies.

A suite of spatiotemporal processing methods are presented to analyze human trajectory data, such as that collected using a GPS device, for the purpose of modeling pedestrian space-time activities.

ניתוח נתונים תלולים מסלול לחקר חלל פעילות הולכי רגל בזמן

It is well recognized that human movement in the  spatial and temporal dimensions has direct influence on disease transmission1-3.  An infectious disease ...

Sampling Blood from the Lateral Tail Vein of the Rat

Blood samples are commonly obtained in many experimental contexts to measure targets of interest, including hormones, immune factors, growth factors, proteins, and glucose, yet the composition of the blood is dynamically regulated and easily perturbed. One factor that can change the blood composition is the stress response triggered by the sampling procedure, which can contribute to variability in the measures of interest. Here we describe a procedure for blood sampling from the lateral tail vein in the rat. This procedure offers significant advantages over other more commonly used techniques. It permits rapid sampling with minimal pain or invasiveness, without anesthesia or analgesia. Additionally, it can be used to obtain large volume samples (upwards of 1 ml in some rats), and it may be used repeatedly across experimental days. By minimizing the stress response and pain resulting from blood sampling, measures can more accurately reflect the true basal state of the animal, with minimal influence from the sampling procedure itself.

Blood samples are useful for assessing biomarkers of physiological states or disease in vivo. Here we describe the methodology to sample blood from the lateral tail vein in the rat. This method provides rapid samples with minimal pain and invasiveness.

דגימת דם מוריד הזנב לרוחב של העכברוש

Blood samples are commonly obtained in many experimental contexts to measure targets of interest, including hormones, immune factors, growth factors, ...

Micropuncture of Bowman's Space in Mice Facilitated by 2 Photon Microscopy

Renal micropuncture and renal 2-photon imaging are seminal techniques in renal physiology. However, micropuncture is limited by dependence on conventional microscopy to surface nephron features, and 2-photon studies are limited in that interventions can only be assessed at the organ, rather than the nephron level. In particular, micropuncture studies of the glomeruli of mice have been challenged by the paucity of surface glomeruli in mice. To address this limitation in order to pursue studies of aspirate from Bowman&#39;s space in mouse physiologic models, we developed 2-photon glomerular micropuncture. We present a novel surgical preparation that allows lateral access to the kidney while preserving the required vertical imaging column for 2-photon microscopy. Administration of high molecular weight fluorescein isothiocyanate (FITC)-dextran is used to render the renal vasculature and therefore glomeruli visible for 2-photon imaging. A quantum dot-coated pipette is then introduced under stereotactic guidance to a glomerulus selected from the several to many which may be visualized within the imaging window. In this protocol, we provide details of the preparation, materials, and methods necessary to carry out the procedure. This technique facilitates previously-impossible physiologic study of the kidney, including recovery of filtrate from Bowman&#39;s space and all segments of the nephron within the imaging depth limit, about 100 &#181;m below the renal capsule. Pressure, charge and flow may all be measured using the introduced pipette. Here, we provide representative data from liquid chromatography/mass spectrometry performed on aspirate from Bowman&#39;s space. We expect this technique to have wide applicability in renal physiologic investigation.

Micropuncture of Bowman&#039;s Space in Mice Facilitated by 2 Photon Microscopy

We present use of 2-photon microscopy to place a micropipette within Bowman&#39;s urinary space in mice, combining 2 foundational techniques of renal physiology. Use of 2-photon microscopy overcomes critical limitations of conventional microscopy for micropuncture renal physiology studies.

Micropuncture של השטח של באומן בעכברים בהנחייתם של מיקרוסקופיית פוטון 2

Renal micropuncture and renal 2-photon imaging are seminal techniques in renal physiology. However, micropuncture is limited by dependence on conventional ...

Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face

Facial expressions, or facial displays, of social or emotional intent are produced by many mammalian taxa as a means of visually communicating with conspecifics at a close range. These displays are achieved by contraction of the mimetic muscles, which are skeletal muscle attached to the dermis of the face. Reverse dissection, removing the full facial mask from the skull and approaching mimetic muscles in reverse, is an effective but destructive way of revealing the morphology of mimetic muscles but it is destructive. DiceCT is a novel mechanism for visualizing skeletal muscles, including mimetic muscles, and isolating individual muscle fascicles for quantitative measurement. Additionally, DiceCT provides a non-destructive mechanism for visualizing muscles. The combined techniques of reverse dissection and DiceCT can be used to assess the evolutionary morphology of mimetic musculature as well as potential contraction strength and velocity in these muscles. This study further demonstrates that DiceCT can be used to accurately and reliably visualize mimetic muscles as well as reverse dissection and provide a non-destructive method for sampling mimetic muscles.

Facial expressions are a mode of visual communication produced by mimetic muscles. Here, we present protocols for the novel techniques of reverse dissection and DiceCT to fully visualize and assess mimetic muscles. These combined techniques can examine both morphological and physiological aspects of mimetic musculature to determine functional aspects.

הפוך לנתיחה ונתונים DiceCT לחשוף אחרת מוסתרים באבולוציה של הפנים הפרימטים

Facial expressions, or facial displays, of social or emotional intent are produced by many mammalian taxa as a means of visually communicating with ...

Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization

Single-molecule fluorescence in situ hybridization (smFISH) allows for counting the absolute number of mRNAs in individual cells. Here, we describe an application of smFISH to measure the rates of transcription and mRNA degradation in Escherichia coli. As smFISH is based on fixed cells, we perform smFISH at multiple time points during a time-course experiment, i.e., when cells are undergoing synchronized changes upon induction or repression of gene expression. At each time point, sub-regions of an mRNA are spectrally distinguished to probe transcription elongation and premature termination. The outcome of this protocol also allows for analyzing intracellular localization of mRNAs and heterogeneity in mRNA copy numbers among cells. Using this protocol many samples (~50) can be processed within 8 h, like the amount of time needed for just a few samples. We discuss how to apply this protocol to study the transcription and degradation kinetics of different mRNAs in bacterial cells.

Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization

This protocol describes an application of single-molecule fluorescence in situ hybridization (smFISH) to measure the in vivo kinetics of mRNA synthesis and degradation.

חיטוט mRNA קינטיקה בחלל וזמן ב Escherichia קולי באמצעות שני צבעים פלואורסצנטיות מולקולה אחת ב סיטו הכלאה

Single-molecule fluorescence in situ hybridization (smFISH) allows for counting the absolute number of mRNAs in individual cells. Here, we describe an ...

Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy

Ultrafast force-clamp spectroscopy (UFFCS) is a single molecule technique based on laser tweezers that allows the investigation of the chemomechanics of both conventional and unconventional myosins under load with unprecedented time resolution. In particular, the possibility to probe myosin motors under constant force right after the actin-myosin bond formation, together with the high rate of the force feedback (200 kHz), has shown UFFCS to be a valuable tool to study the load dependence of fast dynamics such as the myosin working stroke. Moreover, UFFCS enables the study of how processive and non-processive myosin-actin interactions are influenced by the intensity and direction of the applied force.
By following this protocol, it will be possible to perform ultrafast force-clamp experiments on processive myosin-5 motors and on a variety of unconventional myosins. By some adjustments, the protocol could also be easily extended to the study of other classes of processive motors such as kinesins and dyneins. The protocol includes all the necessary steps, from the setup of the experimental apparatus to sample preparation, calibration procedures, data acquisition and analysis.

Presented here is a comprehensive protocol to perform ultrafast force-clamp experiments on processive myosin-5 motors, which could be easily extended to the study of other classes of processive motors. The protocol details all the necessary steps, from the setup of the experimental apparatus to sample preparation, data acquisition and analysis.

ניתוח תכונות מכנואנזימטיות של מיוסינים תהליכיים באמצעות ספקטרוסקופיית מהדק כוח מהירה במיוחד

Ultrafast force-clamp spectroscopy (UFFCS) is a single molecule technique based on laser tweezers that allows the investigation of the chemomechanics of ...