وأيد هذه الدراسة من منحة المعاهد الوطنية للصحة (R15DA029863)، وجامعة فلوريدا أتلانتيك منحة بحثية الجامعية (M30014) وجامعة روس الطب البيطري منحة بحثية. ونود أن نشكر المعهد الوطني لتعاطي المخدرات (روكفيل، MD) عن توفير (±) 3،4-ميثيلين (± MDMA) لهذا العمل.

تمت الموافقة على إجراءات استخدام الحيوانات المبينة أدناه من قبل اللجنة المؤسسية رعاية الحيوان واستخدام (IACUC) في جامعة روس الطب البيطري وجامعة فلوريدا أتلانتيك. على الرغم من أن تقنيات معقمة وقفازات مطلوبة، وبيئة خالية من ريبونوكلياز ليست ضرورية أثناء استخدام هذا البروتوكول. 1. إعداد <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> إعداد الأنسجة وباجتزاء <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> تعيين الفئران بشكل عشوائي إلى ثلاث مجموعات: الطازجة / المالحة (SAL؛ 0.9٪ كلوريد الصوديوم)، مسبوقة / SAL ومسبوقة / 3،4-ميثيلين (MDMA، وانظر التفاصيل في الجدول 1). </li><li style=";text-align:right;direction:rtl"> إدارة ثلاث جرعات من 1 مل / كغ SAL و 10 ملغ / كغ MDMA البريتونى، على التوالي، للجماعات SAL وMDMA في 2 فاصل ساعة. تسمح الحيوانات من أجل البقاء على العلاج لمدة 6 أيام. </li><li style=";text-align:right;direction:rtl"> في يوم 7، إدارة 100 ملغم / كغم من الكيتامين في مزيج من 5 ملغ / كغ زيلازين البريتونى إلى الفئران لالتخدير العميق (أي فقدان طرفة القرنية وتاايل قرصة ردود الفعل). </li><li style=";text-align:right;direction:rtl"> لمجموعة جديدة / SAL، قطع رأس بسرعة الفئران وإزالة المخ لاختبار الدماغ الطازجة (انظر التفاصيل في المرجع 5). </li><li style=";text-align:right;direction:rtl"> بالنسبة للفئات / MDMA مسبوقة / SAL ومسبوقة، اجراء خفض على طول القص حوالي 10 -12 سم ثم فضح نهاية عظمة القص. </li><li style=";text-align:right;direction:rtl"> عقد نهاية القص مع مرقئ وقطع الحجاب الحاجز أفقيا على كلا الجانبين مع مقص حاد ومن ثم خفض إلى أعلى عبر الأضلاع وبالتوازي مع الرئتين. </li><li style=";text-align:right;direction:rtl"> بيد واحدة، وعقد غيض بطني من القلب مع ملقط صغير. مع جهة أخرى، تخترق البطين الأيسر مع 18 G حقنة إبرة (لاحظ الجانب محول الإبرة متصل بخرطوم السليكون على شكل Y إلى SAL وامتصاص العرق الحاويات المثلجة ومضخات تحوي؛ انظر المرجع 9). </li><li style=";text-align:right;direction:rtl"> بدوره على مضخة SAL على مستوى متوسط ​​من معدل التدفق (~ 5 مل / دقيقة) وثقب الأذين الأيمن مع ملقط للسماح للهروب من عودة تنظيم التأمينulation. الحفاظ على SAL نضح لمدة 30 دقيقة. </li><li style=";text-align:right;direction:rtl"> بدوره على مضخة لامتصاص العرق على المستوى المتوسط ​​والسماح 4٪ لامتصاص العرق المثلج ليروي هذا الحيوان لمدة 30 دقيقة. </li><li style=";text-align:right;direction:rtl"> إزالة أداة نضح وقطع رأس الحيوان. جعل خلفي أمامي قطع طريق خط الوسط من الجمجمة، ثم رفرف الجمجمة لفضح تجويف الجمجمة 10. </li><li style=";text-align:right;direction:rtl"> إزالة الدماغ مع ملعقة من تجويف الجمجمة ووضع الدماغ في 50 مل أنبوب الطرد المركزي التي تحتوي على 25 مل من 4٪ لامتصاص العرق. إبقاء الدماغ داخل أنبوب يحتوي على امتصاص العرق في 4 درجة مئوية الثلاجة لمدة 24 ساعة. </li><li style=";text-align:right;direction:rtl"> تحريك الدماغ في أنبوب 50 مل الطرد المركزي التي تحتوي على 25 مل من 30٪ محلول السكروز في 4 درجة مئوية لمدة 3 أيام. وأخيرا، تخزين الدماغ داخل أكياس بلاستيكية في -80 ° C حتى الاستخدام. </li><li style=";text-align:right;direction:rtl"> جبل الدماغ على تشاك مع وسائل الاعلام التضمين وتجميد وسائل الإعلام التضمين التي تحتوي على الدماغ في ناظم البرد في درجة حرارة -26 درجة مئوية ل. قطع جمدت جديدةن المخ إلى 20 ميكرون أقسام وامتصاص العرق-مسبوقة الدماغ إلى أقسام 10 ميكرون. نقل المقطع إلى شرائح المجهر RT عن طريق لمس انتقل إلى القسم. </li><li style=";text-align:right;direction:rtl"> الهواء الجاف في RT لمدة 4 ساعة. تخزين الشرائح القسم في كيس مختوم ضيق في -80 ° C حتى الاستخدام. </li></ol></li><li style=";text-align:right;direction:rtl"> جفاف <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> تأخذ الشرائح من -80 ° C الفريزر وتعيين أقسام في واحدة من ثلاثة اختبارات: ht2a، ppiB (مراقبة إيجابية) أو dapB (مراقبة سلبية)؛ علامة وأقسام التسمية مع الكرة من ركلة جزاء (لا تستخدم قلم رصاص). غمر الشرائح في 100٪ كحول في RT لمدة 5 دقائق. تجفيف الشرائح لمدة 5 دقائق في غطاء الدخان. </li></ol></li><li style=";text-align:right;direction:rtl"> المعالجة <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> ماصة 20 ميكرولتر من كاشف المعالجة 1 (تثبيط إنزيم الفوسفاتيز القلوية) للأقسام على الشرائح. ضع الشرائح على السكك الحديدية رف في علبة الرطوبة (لاحظ أن علبة ومغطاة بغطاء للحفاظ على رطوبة عالية لمنع التبخر من solutio رد فعلن). </li><li style=";text-align:right;direction:rtl"> يهز بلطف علبة الرطوبة على شاكر الأفقي على سرعة منخفضة لمدة 10 دقيقة. تغسل الشرائح مرتين بالماء المقطر المزدوج ([ده 2 O) لمدة 2 دقيقة. غمر الشريحة في كوب 200 مل تحتوي على 150 مل من كاشف المعالجة 2 (كسر الروابط عبر الناجم عن امتصاص العرق التثبيت). تغلي الشرائح ليصبح المجموع 5 دقائق عند 100 درجة مئوية (استعادة الناجم عن الحرارة هيكل RNA 11). </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين مع ده 2 O لمدة 2 دقيقة. ضع الشرائح في 100٪ الكحول لمدة 5 دقائق. تجفيف الشرائح لمدة 5 دقائق في غطاء الدخان. استخدام قلم مسعور لرسم دائرة حول المنطقة المحددة في قسم الأنسجة (على سبيل المثال، والهياكل غير القشرية، بما في ذلك المهاد وتحت المهاد كما هو مبين في الشكل 2). </li><li style=";text-align:right;direction:rtl"> ماصة 10 ميكرولتر من كاشف المعالجة-3 (الزيادات في اختراق التحقيق) إلى كل المنطقة المختارة، وتغطية صينية الرطوبة مع غطاء. وضع صينية في الفرن التهجينمجهزة شاكر الأفقي وتعيين درجة حرارة الفرن عند 40 درجة مئوية. يهز بلطف علبة لمدة 30 دقيقة. تغسل الشرائح مرتين مع ده 2 O لمدة 2 دقيقة. </li></ol></li></ol> 2. التهجين والتضخيم <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> ماصة 10 ميكرولتر من htr2a، ppiB وdapB الكواشف التحقيق، على التوالي، في مناطق مختارة. تغطية صينية الرطوبة مع غطاء لمنع تبخر الكاشف. هز بلطف على شاكر الأفقي وضعت في سرعة منخفضة. احتضان الشرائح في 40 درجة مئوية في الفرن لمدة 2 ساعة. </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين مع العازلة غسل لمدة 2 دقيقة. ماصة 10 ميكرولتر من كاشف التضخيم-1 على كل المنطقة المحددة، ويهز واحتضان الشرائح في 40 درجة مئوية لمدة 30 دقيقة. </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين مع العازلة غسل لمدة 2 دقيقة. ماصة 10 ميكرولتر من كاشف التضخيم-2 على كل المنطقة المحددة، ويهز واحتضان الشرائح في 40 درجة مئوية لمدة 15 دقيقة. </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين ثإيث العازلة الغسيل لمدة 2 دقيقة. ماصة 10 ميكرولتر من كاشف التضخيم-3 على كل المنطقة المحددة، ويهز واحتضان الشرائح في 40 درجة مئوية لمدة 30 دقيقة. </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين مع العازلة غسل لمدة 2 دقيقة. ماصة 10 ميكرولتر من كاشف التضخيم-4 على كل المنطقة المحددة، ويهز واحتضان الشرائح في 40 درجة مئوية لمدة 15 دقيقة. </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين مع العازلة غسل لمدة 2 دقيقة. ماصة 10 ميكرولتر من كاشف التضخيم-5 على كل المنطقة المحددة، ويهز واحتضان الشرائح في RT لمدة 30 دقيقة. </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين مع العازلة غسل لمدة 2 دقيقة. ماصة 10 ميكرولتر من كاشف التضخيم-6 على كل المنطقة المحددة، ويهز واحتضان الشرائح في RT لمدة 15 دقيقة. تغسل الشرائح مرتين مع العازلة غسل لمدة 2 دقيقة. </li></ol> 3. كشف الإشارة <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> ماصة 10 ميكرولتر من كاشف الأحمر إلى كل المنطقة المحددة (لاحظ أن كاشف هو خليط من الأحمر-B والأحمر-A بنسبة 1:60 وينبغي استخدام طmmediately). ضع الشريحة في علبة الرطوبة على شاكر الأفقي في RT ويهز بلطف على سرعة منخفضة لمدة 10 دقيقة. </li><li style=";text-align:right;direction:rtl"> تغسل الشرائح مرتين مع (ده 2 O) لمدة 10 دقيقة. تجفيف الشرائح في 60 درجة مئوية في الفرن لمدة 15 دقيقة. ضع الشرائح في الزيلين تحت غطاء الدخان لمدة 5 دقائق. ماصة 20 ميكرولتر من القائم الزيلين وسائل الاعلام المتزايدة على كل المنطقة المختارة، وتغطي مع ساترة. </li></ol> 4. التقاط الصور <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> اتخاذ microphotographs الرقمي للمناطق مختارة (على سبيل المثال، ما تحت المهاد، أرقام 1 و 3) مع التكبير من 4 × 20 × العدسات وموضوعية. حفظ ملف الصورة. </li></ol> 5. صورة تحليل الجسيمات <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> سحب وإسقاط ملف الصورة في إطار يماغيج الرئيسي. انتقل إلى شريط القوائم واختيار &quot;صورة&quot;، بجانب تحديد &quot;نوع&quot; من القائمة المنسدلة، وحدد &quot;8 بت&quot;. </li><li style=";text-align:right;direction:rtl"> اختر &#39;ضبط&#39;، ثم اختر &#39;منتدى المجالس الرومانسيةeshold &quot;لفتح مربع الحوار. ضبط انخفاض قيمة شريط في مربع الحوار بحيث تتم إزالة الخلفية غير المرغوب فيها. انتقل إلى شريط القوائم واختيار &quot;تحليل&quot;، ثم حدد &quot;تحليل الجزيئات&quot; لفتح مربع الحوار الثاني. </li><li style=";text-align:right;direction:rtl"> تعيين حجم الجسيمات في 10، و من ثم &#39;عرض الخطوط العريضة &quot;وحدد&quot; عرض النتائج &quot;و&quot; صناديق تلخيص &quot;. وأخيرا، انقر فوق &quot;موافق&quot; لعرض البيانات الجسيمات في مربعات الحوار. </li></ol> 6. جدول حساب <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> إدخال البيانات في ورقة اكسل ويبلغ متوسط ​​أعداد الجزيئات في مجموعة SAL كأساس. حساب مستوى نسبة كل قسم وجعل الرسم البياني وفقا لذلك (الشكل 4). </li></ol>

<ol>
	<li>Muzyk, A. J., Jakel, R. J., Preud'homme, X. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Serotonin+syndrome+after+a+massive+overdose+of+controlled-release+paroxetine.">Serotonin syndrome after a massive overdose of controlled-release paroxetine.</a> Psychosomatics. 51, 437-442 (2010).</li><li>Davies, O., Batajoo-Shrestha, B., Sosa-Popoteur, J., Olibrice, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Full+recovery+after+severe+serotonin+syndrome,+severe+rhabdomyolysis,+multi-organ+failure+and+disseminated+intravascular+coagulopathy+from+MDMA.">Full recovery after severe serotonin syndrome, severe rhabdomyolysis, multi-organ failure and disseminated intravascular coagulopathy from MDMA.</a> Heart Lung. 43, 117-119 (2014).</li><li>Bosch, O. G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Verbal+memory+deficits+are+correlated+with+prefrontal+hypometabolism+in+18FDG+PET+of+recreational+MDMA+users.">Verbal memory deficits are correlated with prefrontal hypometabolism in 18FDG PET of recreational MDMA users.</a> PLoS On. 8, e61234 (2013).</li><li>Smithies, V., Broadbear, J., Verdejo-Garcia, A., Conduit, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dysfunctional+overnight+memory+consolidation+in+ecstasy+users.">Dysfunctional overnight memory consolidation in ecstasy users.</a> J Psychopharmaco. 28, 751-762 (2014).</li><li>Winzer-Serhan, U. H., Broide, R. S., Chen, Y., Leslie, F. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Highly+sensitive+radioactive+in+situ+hybridization+using+full+length+hydrolyzed+riboprobes+to+detect+&#945;2+adrenoceptor+subtype+mRNAs+in+adult+and+developing+rat+brain.">Highly sensitive radioactive in situ hybridization using full length hydrolyzed riboprobes to detect &#945;2 adrenoceptor subtype mRNAs in adult and developing rat brain.</a> Brain Res Brain Res Proto. 3, 229-241 (1999).</li><li>Zoeller, R. T., Fletcher, D. L., Butnariu, O., Lowry, C. A., Moore, F. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=N-ethylmaleimide+(NEM)+can+significantly+improve+in+situ+hybridization+results+using+35S-labeled+oligodeoxynucleotide+or+complementary+RNA+probes.">N-ethylmaleimide (NEM) can significantly improve in situ hybridization results using 35S-labeled oligodeoxynucleotide or complementary RNA probes.</a> J Histochem Cytoche. 45, 1035-1041 (1997).</li><li>Wang, F., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RNAscope:+a+novel+in+situ+RNA+analysis+platform+for+formalin-fixed,+paraffin-embedded+tissues.">RNAscope: a novel in situ RNA analysis platform for formalin-fixed, paraffin-embedded tissues.</a> J Mol Diag. 14, 22-29 (2012).</li><li>Wang, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RNAscope+for+in+situ+detection+of+transcriptionally+active+human+papillomavirus+in+head+and+neck+squamous+cell+carcinoma.">RNAscope for in situ detection of transcriptionally active human papillomavirus in head and neck squamous cell carcinoma.</a> J Vis E. , (2014).</li><li>Gage, G. J., Kipke, D. R., Shain, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Whole+animal+perfusion+fixation+for+rodents.">Whole animal perfusion fixation for rodents.</a> J Vis E. , (2012).</li><li>Mishra, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Imaging+pericytes+and+capillary+diameter+in+brain+slices+and+isolated+retinae.">Imaging pericytes and capillary diameter in brain slices and isolated retinae.</a> Nat Proto. 9, 323-336 (2014).</li><li>Shi, S. R., Cote, R. J., Taylor, C. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Antigen+retrieval+techniques:+current+perspectives.">Antigen retrieval techniques: current perspectives.</a> J Histochem Cytoche. 49, 931-937 (2001).</li><li>Qin, Y., Heine, V. M., Karst, H., Lucassen, P. J., Joels, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gene+expression+patterns+in+rat+dentate+granule+cells:+comparison+between+fresh+and+fixed+tissue.">Gene expression patterns in rat dentate granule cells: comparison between fresh and fixed tissue.</a> J Neurosci Method. 131, 205-211 (2003).</li><li>Carter, B. S., Fletcher, J. S., Thompson, R. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+messenger+RNA+expression+by+in+situ+hybridization+using+RNA+probes+synthesized+via+in+vitro+transcription.">Analysis of messenger RNA expression by in situ hybridization using RNA probes synthesized via in vitro transcription.</a> Method. 52, 322-331 (2010).</li><li>Mijnster, M. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regional+and+cellular+distribution+of+serotonin+5-hydroxytryptamine2a+receptor+mRNA+in+the+nucleus+accumbens,+olfactory+tubercle,+and+caudate+putamen+of+the+rat.">Regional and cellular distribution of serotonin 5-hydroxytryptamine2a receptor mRNA in the nucleus accumbens, olfactory tubercle, and caudate putamen of the rat.</a> J Comp Neuro. 389, 1-11 (1997).</li><li>Li, Q., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Brain+region-specific+alterations+of+5-HT2A+and+5-HT2C+receptors+in+serotonin+transporter+knockout+mice.">Brain region-specific alterations of 5-HT2A and 5-HT2C receptors in serotonin transporter knockout mice.</a> J Neuroche. 84, 1256-1265 (2003).</li><li>Horner, K. A., Gilbert, Y. E., Noble, E. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differential+regulation+of+5-HT2A+receptor+mRNA+expression+following+withdrawal+from+a+chronic+escalating+dose+regimen+of+D-amphetamine.">Differential regulation of 5-HT2A receptor mRNA expression following withdrawal from a chronic escalating dose regimen of D-amphetamine.</a> Brain Re. 1390, 10-20 (2011).</li><li>Mocci, G., Jimenez-Sanchez, L., Adell, A., Cortes, R., Artigas, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Expression+of+5-HT2A+receptors+in+prefrontal+cortex+pyramidal+neurons+projecting+to+nucleus+accumbens.+Potential+relevance+for+atypical+antipsychotic+action.">Expression of 5-HT2A receptors in prefrontal cortex pyramidal neurons projecting to nucleus accumbens. Potential relevance for atypical antipsychotic action.</a> Neuropharmacolog. 79, 49-58 (2014).</li><li>Reneman, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+acute+and+chronic+effects+of+MDMA+('Ecstasy')+on+cortical+5-HT2A+receptors+in+rat+and+human.">The acute and chronic effects of MDMA ('Ecstasy') on cortical 5-HT2A receptors in rat and human.</a> 26, 387-396 (2002).</li></ol>

تعلن الكتاب أنه ليس لديهم المصالح المالية المتنافسة.

One of the major concerns of in situ hybridization test is to choose appropriate techniques used for RNA preservation because of RNase enzymes. It is well known that these enzymes are widely present in the cells and environment which can affect the results. However, enzyme activity can be quickly distinguished by placing the tissue in the dry ice/alcohol solution5,12. Although quick preservation is critical for hybridization using a riboprobe13, little is known about experimental conditions...

Serotonin (5-hydroxytryptamine; 5-HT) syndrome is an acute neurologic disorder caused by 5-HT-promoting drugs such as antidepressants1, while also occurring in situations of MDMA use for recreational purposes2. Molecular mechanisms responsible for mood swings, learning and memory deficits that occur in association with the acute syndrome are not well understood3,4. In situ hybridization is a powerful research tool allowing the detection and quantification of specific mRNAs expressed potentially at a single-cell level. The conventional way to perform in situ hybridization is to utilize a radioactive-labeled riboprobe that specifically hybridizes the gene of interest. However, a major drawback is that the method requires complicated and time-consuming probe preparation and hybridization steps, as well as access to fresh frozen tissues maintained in an RNase-free environment5,6. 
Oligonucleotide probes have been recently developed to hybridize shorter RNA fragments than those required for riboprobes7. Furthermore, the probes produce a low background signal without sacrificing specificity8. This newly-developed probe technology can be used in situ hybridization on paraformaldehyde-prefixed brain tissues commonly available in immunocytochemical laboratories.
Here, we describe a protocol for in situ hybridization using oligonucleotide probes on paraformaldehyde-prefixed rat brain and compare findings with those noted in a fresh frozen brain5,6. This protocol is used to test the hypothesis that MDMA substance abuse causes changes in 5-HT2A receptor gene htr2a mRNA in the brain. We began the procedure with MDMA treatment followed by paraformaldehyde tissue perfusion of the animal, in situ hybridization of the thr2a probe, and data analysis. Note that dapB (the bacterial gene coding for dihydrodipicolinate reductase) is used as a negative control, and ppiB (housekeeping gene coding for peptidylprolyl isomerase B) as a positive control.

<table border="0" cellpadding="0" cellspacing="0" width="873">
	<tbody>
		<tr>
			<td>RNAscope Negative Control Probe-DapB</td>
			<td>Advanced cell diagnostic, INC</td>
			<td>310098</td>
			<td></td>
		</tr>
		<tr>
			<td>RNAscope Pretreat 4</td>
			<td>Advanced cell diagnostic, INC</td>
			<td>320046</td>
			<td></td>
		</tr>
		<tr>
			<td>RNAscope 2.0 HD Reagent Kit - Red</td>
			<td>Advanced cell diagnostic, INC</td>
			<td>310036</td>
			<td></td>
		</tr>
		<tr>
			<td>RNAscope Probe - Rn-Ppib</td>
			<td>Advanced cell diagnostic, INC</td>
			<td>313921</td>
			<td></td>
		</tr>
		<tr>
			<td>Rat Htr2a</td>
			<td>Advanced cell diagnostic, INC</td>
			<td>300031</td>
			<td></td>
		</tr>
		<tr>
			<td>Cryostat</td>
			<td>Leica</td>
			<td>CM 1850</td>
			<td></td>
		</tr>
		<tr>
			<td>Horizontal shaker</td>
			<td>VWR</td>
			<td>88032-088</td>
			<td></td>
		</tr>
		<tr>
			<td>Hybridization oven</td>
			<td>Thermo Fisher Scientific</td>
			<td>222000</td>
			<td></td>
		</tr>
		<tr>
			<td>Superfrost Plus microscope slide</td>
			<td>Fisher Scientific</td>
			<td>12-550-15</td>
			<td></td>
		</tr>
		<tr>
			<td>Hydrophobic pen</td>
			<td>Vector</td>
			<td>H-4000</td>
			<td></td>
		</tr>
		<tr>
			<td>Microscope</td>
			<td>Olympus</td>
			<td>Provis AX70</td>
			<td></td>
		</tr>
	</tbody>
</table>

rapid in situ hybridization using oligonucleotide probes on paraformaldehyde-prefixed brain of rats with serotonin syndrome

3,4-Methylenedioxymethamphetamine (MDMA; ecstasy) toxicity may cause region-specific changes in serotonergic mRNA expression due to acute serotonin (5-hydroxytryptamine; 5-HT) syndrome. This hypothesis can be tested using in situ hybridization to detect the serotonin 5-HT2A receptor gene htr2a. In the past, such procedures, utilizing radioactive riboprobe, were difficult because of the complicated workflow that needs several days to perform and the added difficulty that the technique required the use of fresh frozen tissues maintained in an RNase-free environment. Recently, the development of short oligonucleotide probes has simplified in situ hybridization procedures and allowed the use of paraformaldehyde-prefixed brain sections, which are more widely available in laboratories. Here, we describe a detailed protocol using non-radioactive oligonucleotide probes on the prefixed brain tissues. Hybridization probes used for this study include dapB (a bacterial gene coding for dihydrodipicolinate reductase), ppiB (a housekeeping gene coding for peptidylprolyl isomerase B), and htr2a (a serotonin gene coding for 5-HT2A receptors). This method is relatively simply, cheap, reproducible and requires less than two days to complete.

باستخدام المجسات قليل النوكليوتيد RNA (&lt;25 الإقليم الشمالي)، ويمكن الكشف عن التهجين كنقاط حمراء في خلايا المخ تحت المهاد البصري أعدت من العقول المجمدة-مسبوقة لامتصاص العرق والعذبة. جزيئات htr2a مرنا موجودة في بعض الخلايا (المشار إليها السهام الصلبة)، ولكن ليس غيرها...

Watch this Scientific Journal Video about Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome at JoVE.com

Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome

This protocol describes a rapid and simplified in situ hybridization method ideal forparaformaldehyde-prefixed brain, thus reducing the need for prolonged complex steps while using fresh frozen tissues. The method is validated using the identification of the serotonin 5-HT2A receptor gene htr2a in rats.

سريع<em&gt; في الموقع</em&gt; التهجين باستخدام قليل النوكليوتيد تحقيقات على مسبوقة لامتصاص العرق دماغ الفئران مع السيروتونين متلازمة

3,4-Methylenedioxymethamphetamine (MDMA; ecstasy) toxicity may cause region-specific changes in serotonergic mRNA expression due to acute serotonin ...

rapid-situ-hybridization-using-oligonucleotide-probes-on

Research

JoVE Journal

Neuroscience

Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome

8.8K Views.  Ross University School of Veterinary Medicine. This protocol describes a rapid and simplified in situ hybridization method ideal forparaformaldehyde-prefixed brain, thus reducing the need for prolonged complex steps while using fresh frozen tissues. The method is validated using the identification of the serotonin 5-HT2A receptor gene htr2a in rats.

Video: Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome

Complete Spinal Cord Injury and Brain Dissection Protocol for Subsequent Wholemount In Situ Hybridization in Larval Sea Lamprey

After a complete spinal cord injury, sea lampreys at first are paralyzed below the level of transection. However, they recover locomotion after several weeks, and this is accompanied by short distance regeneration (a few mm) of propriospinal axons and spinal-projecting axons from the brainstem. Among the 36 large identifiable spinal-projecting neurons, some are good regenerators and others are bad regenerators. These neurons can most easily be identified in wholemount CNS preparations. In order to understand the neuron-intrinsic mechanisms that favor or inhibit axon regeneration after injury in the vertebrates CNS, we determine differences in gene expression between the good and bad regenerators, and how expression is influenced by spinal cord transection. This paper illustrates the techniques for housing larval and recently transformed adult sea lampreys in fresh water tanks, producing complete spinal cord transections under microscopic vision, and preparing brain and spinal cord wholemounts for in situ hybridization. Briefly, animals are kept at 16&#160;&#176;C and anesthetized in 1% Benzocaine in lamprey Ringer. The spinal cord is transected with iridectomy scissors via a dorsal approach and the animal is allowed to recover in fresh water tanks at 23 &#176;C. For in situ hybridization, animals are reanesthetized and the brain and cord removed via a dorsal approach.

Complete Spinal Cord Injury and Brain Dissection Protocol for Subsequent Wholemount In Situ Hybridization in Larval Sea Lamprey

Lampreys recover locomotion after a complete spinal cord injury. However, some spinal-projecting neurons are good regenerators and others are not. This paper illustrates the techniques for housing sea lamprey larvae (and recently transformed adults), producing complete spinal cord transections and preparing wholemount brains and spinal cords for in situ hybridization.

إصابة الحبل الشوكي الكامل وبروتوكول تشريح الدماغ لاحقا Wholemount<em&gt; في الموقع</em&gt; التهجين في اليرقات البحر الجلكى

After a complete spinal cord injury, sea lampreys at first are paralyzed below the level of transection. However, they recover locomotion after several ...

Detection of Axonally Localized mRNAs in Brain Sections Using High-Resolution In Situ Hybridization

mRNAs are frequently localized to vertebrate axons and their local translation is required for axon pathfinding or branching during development and for maintenance, repair or neurodegeneration in postdevelopmental periods. High throughput analyses have recently revealed that axons have a more dynamic and complex transcriptome than previously expected. These analysis, however have been mostly done in cultured neurons where axons can be isolated from the somato-dendritic compartments. It is virtually impossible to achieve such isolation in whole tissues in vivo. Thus, in order to verify the recruitment of mRNAs and their functional relevance in a whole animal, transcriptome analyses should ideally be combined with techniques that allow the visualization of mRNAs in situ. Recently, novel ISH technologies that detect RNAs at a single-molecule level have been developed. This is especially important when analyzing the subcellular localization of mRNA, since localized RNAs are typically found at low levels. Here we describe two protocols for the detection of axonally-localized mRNAs using a novel ultrasensitive RNA ISH technology. We have combined RNAscope ISH with axonal counterstain using fluorescence immunohistochemistry or histological dyes to verify the recruitment of Atf4 mRNA to axons in vivo in the mature mouse and human brains.

Detection of Axonally Localized mRNAs in Brain Sections Using High-Resolution In Situ Hybridization

RNA in situ hybridization (ISH) enables the visualization of RNAs in cells and tissues. Here we show how combination of RNAscope ISH with immunohistochemistry or histological dyes can be successfully used to detect mRNAs localized to axons in sections of mouse and human brains.

الكشف عن Axonally المترجمة من mRNAs في أقسام المخ باستخدام عالية الدقة<em&gt; في الموقع</em&gt; التهجين

mRNAs are frequently localized to vertebrate axons and their local translation is required for axon pathfinding or branching during development and for ...

Combining Double Fluorescence In Situ Hybridization with Immunolabelling for Detection of the Expression of Three Genes in Mouse Brain Sections

Detection of gene expression in different types of brain cells e.g., neurons, astrocytes, oligodendrocytes, oligodendrocyte precursors and microglia, can be hampered by the lack of specific primary or secondary antibodies for immunostaining. Here we describe a protocol to detect the expression of three different genes in the same brain section using double fluorescence in situ hybridization with two gene-specific probes followed by immunostaining with an antibody of high specificity directed against the protein encoded by a third gene. The Aspartoacyclase (ASPA) gene, mutations of which can lead to a rare human white matter disease - Canavan disease - is thought to be expressed in oligodendrocytes and microglia but not in astrocytes and neurons. However, the precise expression pattern of ASPA in the brain has yet to be established. This protocol has allowed us to determine that ASPA is expressed in a subset of mature oligodendrocytes and it can be generally applied to a wide range of gene expression pattern studies.

Combining Double Fluorescence In Situ Hybridization with Immunolabelling for Detection of the Expression of Three Genes in Mouse Brain Sections

Localizing gene expression to specific cell types can be challenging due to the lack of specific antibodies. Here we describe a protocol for simultaneous triple detection of gene expression by combining double fluorescence RNA in situ hybridization with immunostaining.

الجمع بين نقرا الإسفار<em&gt; في الموقع</em&gt; التهجين مع Immunolabelling للكشف عن التعبير عن ثلاثة جينات في أقسام الدماغ ماوس

Detection of gene expression in different types of brain cells e.g., neurons, astrocytes, oligodendrocytes, oligodendrocyte precursors and microglia, can ...

Recording EEG in Freely Moving Neonatal Rats Using a Novel Method

EEG is a useful method to detect electrical activity in the brain. Moreover, it is a widely used diagnostic tool for various neurological conditions, such as epilepsy and neurodegenerative disorders. However, it is technically difficult to obtain EEG recordings in neonates as it requires specialized handling and great care. Here, we present a novel method to record EEG in neonatal rat pups (P8-P15). We designed a simple and reliable electrode using computer pin loci; it can be easily implanted into the skull of a rat pup to record high-quality EEG signals in the normal and epileptic brain. Pups were given an intraperitoneal (i.p.) injection of the neurotoxin kainic acid (KA) to induce epileptic seizures. The surgical implantation performed in this procedure is less expensive than other EEG procedures for neonates. This method allows one to record high-quality and stable EEG signals for more than 1 week. Furthermore, this procedure can also be applied to adult rats and mice to study epilepsy or other neurological disorders.

Here, we introduce a novel technique designed to record electroencephalography (EEG) in freely moving neonatal epileptic pups and describe its procedures, features, and applications. This method allows one to record EEG for more than 1 week.

تسجيل إيغ في التحرك بحرية الفئران حديثي الولادة باستخدام طريقة رواية

EEG is a useful method to detect electrical activity in the brain. Moreover, it is a widely used diagnostic tool for various neurological conditions, such ...

Localization of Odorant Receptor Genes in Locust Antennae by RNA In Situ Hybridization

Insects have evolved sophisticated olfactory reception systems to sense exogenous chemical signals. These chemical signals are transduced by Olfactory Receptor Neurons (ORNs) housed in hair-like structures, called chemosensilla, of the antennae. On the ORNs&#39; membranes, Odorant Receptors (ORs) are believed to be involved in odor coding. Thus, being able to identify genes localized to the ORNs is necessary to recognize OR genes, and provides a fundamental basis for further functional in situ studies. The RNA expression levels of specific ORs in insect antennae are very low, and preserving insect tissue for histology is challenging. Thus, it is difficult to localize an OR to a specific type of sensilla using RNA in situ hybridization. In this paper, a detailed and highly effective RNA in situ hybridization protocol particularly for lowly expressed OR genes of insects, is introduced. In addition, a specific OR gene was identified by conducting double-color fluorescent in situ hybridization experiments using a co-expressing receptor gene, Orco, as a marker.

Localization of Odorant Receptor Genes in Locust Antennae by RNA In Situ Hybridization

This paper describes a detailed and highly effective RNA in situ hybridization protocol particularly for low-level expressed Odorant Receptor (OR) genes, as well as other genes, in insect antennae using digoxigenin (DIG)-labeled or biotin-labeled probes.

توطين الجينات مستقبلات أودورانت في هوائيات الجراد بواسطة الحمض النووي الريبي<em&gt; في الموقع</em&gt; التهجين

Insects have evolved sophisticated olfactory reception systems to sense exogenous chemical signals. These chemical signals are transduced by Olfactory ...

Two-photon Imaging of Microglial Processes' Attraction Toward ATP or Serotonin in Acute Brain Slices

Microglial cells are resident innate immune cells of the brain that constantly scan their environment with their long processes and, upon disruption of homeostasis, undergo rapid morphological changes. For example, a laser lesion induces in a few minutes an oriented growth of microglial processes, also called &#34;directional motility&#34;, toward the site of injury. A similar effect can be obtained by delivering locally ATP or serotonin (5-hydroxytryptamine [5-HT]). In this article, we describe a protocol to induce a directional growth of microglial processes toward a local application of ATP or 5-HT in acute brain slices of young and adult mice and to image this attraction over time by multiphoton microscopy. A simple method of quantification with free and open-source image analysis software is proposed. A challenge that still characterizes acute brain slices is the limited time, decreasing with age, during which the cells remain in a physiological state. This protocol, thus, highlights some technical improvements (medium, air-liquid interface chamber, imaging chamber with a double perfusion) aimed at optimizing the viability of microglial cells over several hours, especially in slices from adult mice.

Microglia, the resident immune cells of the brain, respond quickly with morphological changes to modifications of their environment. This protocol describes how to use two-photon microscopy to study the attraction of microglial processes toward serotonin or ATP in acute brain slices of mice.

اثنين-فوتون تصوير الجذب Microglial العمليات تجاه ATP أو السيروتونين في الدماغ الحادة شرائح

Microglial cells are resident innate immune cells of the brain that constantly scan their environment with their long processes and, upon disruption of ...

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

Mild traumatic brain injury (mTBI) is the most common type of acquired brain injury. Since patients with traumatic brain injury show a tremendous variability and heterogeneity (age, gender, type of trauma, other possible pathologies, etc.), animal models play a key role in unraveling factors that are limitations in clinical research. They provide a standardized and controlled setting to investigate the biological mechanisms of injury and repair following TBI. However, not all animal models mimic the diffuse and subtle nature of mTBI effectively. For example, the commonly used controlled cortical impact (CCI) and lateral fluid percussion injury (LFPI) models make use of a craniotomy to expose the brain and induce widespread focal trauma, which are not commonly seen in mTBI. Therefore, these experimental models are not valid to mimic mTBI. Thus, an appropriate model should be used to investigate mTBI. The Marmarou weight drop model for rats induces similar microstructural alterations and cognitive impairments as seen in patients who sustain mild trauma; therefore, this model was selected for this protocol. Conventional computed tomography and magnetic resonance imaging (MRI) scans commonly show no damage following a mild injury, because mTBI induces often only subtle and diffuse injuries. With diffusion weighted MRI, it is possible to investigate microstructural properties of brain tissue, which can provide more insight into the microscopic alterations following mild trauma. Therefore, the goal of this study is to obtain quantitative information of a selected region-of-interest (i.e., hippocampus) to follow up disease progression after obtaining a mild and diffuse brain injury.

The overall goal of this procedure is to obtain quantitative microstructural information of the hippocampus in a rat with mild traumatic brain injury. This is done using an advanced diffusion-weighted magnetic resonance imaging protocol and region-of-interest based analysis of parametric diffusion maps.

التصوير الانتشار المتقدم في الحصين من الفئران مع إصابات الدماغ صدمة خفيفة

Mild traumatic brain injury (mTBI) is the most common type of acquired brain injury. Since patients with traumatic brain injury show a tremendous ...

Induction of Diffuse Axonal Brain Injury in Rats Based on Rotational Acceleration

Traumatic brain injury (TBI) is a major cause of death and disability. Diffuse axonal injury (DAI) is the predominant mechanism of injury in a large percentage of TBI patients requiring hospitalization. DAI involves widespread axonal damage from shaking, rotation or blast injury, leading to rapid axonal stretch injury and secondary axonal changes that are associated with a long-lasting impact on functional recovery. Historically, experimental models of DAI without focal injury have been difficult to design. Here we validate a simple, reproducible and reliable rodent model of DAI that causes widespread white matter damage without skull fractures or contusions.

This protocol validates a reliable, easy-to-perform and reproducible rodent model of brain diffuse axonal injury (DAI) that induces widespread white matter damage without skull fractures or contusions.

تحريض من منتشر إصابة الدماغ أكسونال في الفئران على أساس تسارع التناوب

Traumatic brain injury (TBI) is a major cause of death and disability. Diffuse axonal injury (DAI) is the predominant mechanism of injury in a large ...

Combining Multiplex Fluorescence In Situ Hybridization with Fluorescent Immunohistochemistry on Fresh Frozen or Fixed Mouse Brain Sections

Fluorescent in situ hybridization (FISH) is a molecular technique that identifies the presence and spatial distribution of specific RNA transcripts within cells. Neurochemical phenotyping of functionally identified neurons usually requires concurrent labelling with multiple antibodies (targeting protein) using immunohistochemistry (IHC) and optimization of in situ hybridization (targeting RNA), in tandem. A &#34;neurochemical signature&#34; to characterize particular neurons may be achieved however complicating factors include the need to verify FISH and IHC targets before combining the methods, and the limited number of RNAs and proteins that may be targeted simultaneously within the same tissue section.
Here we describe a protocol, using both fresh frozen and fixed mouse brain preparations, which detects multiple mRNAs and proteins in the same brain section using RNAscope FISH followed by fluorescence immunostaining, respectively. We use the combined method to describe the expression pattern of low abundance mRNAs (e.g., galanin receptor 1) and high abundance mRNAs (e.g., glycine transporter 2), in immunohistochemically identified brainstem nuclei.
Key considerations for protein labelling downstream of the FISH assay extend beyond tissue preparation and optimization of FISH probe labelling. For example, we found that antibody binding and labelling specificity can be detrimentally affected by the protease step within the FISH probe assay. Proteases catalyze hydrolytic cleavage of peptide bonds, facilitating FISH probe entry into cells, however they may also digest the protein targeted by the subsequent IHC assay, producing off target binding. The subcellular location of the targeted protein is another factor contributing to IHC success following FISH probe assay. We observed IHC specificity to be retained when the targeted protein is membrane bound, whereas IHC targeting cytoplasmic protein required extensive troubleshooting. Finally, we found handling of slide-mounted fixed frozen tissue more challenging than fresh frozen tissue, however IHC quality was overall better with fixed frozen tissue, when combined with RNAscope.

Combining Multiplex Fluorescence In Situ Hybridization with Fluorescent Immunohistochemistry on Fresh Frozen or Fixed Mouse Brain Sections

This protocol describes a method for combining fluorescence in situ hybridization (FISH) and fluorescence immunohistochemistry (IHC) in both fresh frozen and fixed mouse brain sections, with the goal of achieving multilabel FISH and fluorescence IHC signal. IHC targeted cytoplasmic and membrane attached proteins.

الجمع بين التهجين الفلوري المتعدد في الموقع مع الكيمياء الهيستولوجية المناعية الفلورية على أقسام دماغ الفأر الطازجة المجمدة أو الثابتة

Fluorescent in situ hybridization (FISH) is a molecular technique that identifies the presence and spatial distribution of specific RNA transcripts within ...

Detection of G Protein-coupled Receptor Expression in Mouse Vagal Afferent Neurons using Multiplex In Situ Hybridization

This study describes a protocol for the multiplex in situ hybridization (ISH) of the mouse jugular-nodose ganglia, with a particular emphasis on detecting the expression of G protein-coupled receptors (GPCRs). Formalin-fixed jugular-nodose ganglia were processed with the RNAscope technology to simultaneously detect the expression of two representative GPCRs (cholecystokinin and ghrelin receptors) in combination with one marker gene of either nodose (paired-like homeobox 2b, Phox2b) or jugular afferent neurons (PR domain zinc finger protein 12, Prdm12). Labeled ganglia were imaged using confocal microscopy to determine the distribution and expression patterns of the aforementioned transcripts. Briefly, Phox2b afferent neurons were found to abundantly express the cholecystokinin receptor (Cck1r) but not the ghrelin receptor (Ghsr). A small subset of Prdm12 afferent neurons was also found to express Ghsr and/or Cck1r. Potential technical caveats in the design, processing, and interpretation of multiplex ISH are discussed. The approach described in this article may help scientists in generating accurate maps of the transcriptional profiles of vagal afferent neurons.

Detection of G Protein-coupled Receptor Expression in Mouse Vagal Afferent Neurons using Multiplex In Situ Hybridization

Multiplex in situ hybridization (ISH) was employed to simultaneously visualize the transcripts for two G protein-coupled receptors and one transcription factor in the entire vagal ganglionic complex of the adult mouse. This protocol could be used to generate accurate maps of the transcriptional profiles of vagal afferent neurons.

الكشف عن G البروتين إلى جانب مستقبلات التعبير في الخلايا العصبية Vagal الماوس Afferent باستخدام Multix في الموقع التهجين

This study describes a protocol for the multiplex in situ hybridization (ISH) of the mouse jugular-nodose ganglia, with a particular emphasis on detecting ...