Name: use of synaptic zinc histochemistry to reveal different regions and laminae in the developing and adult brain
Uploaded: 2017-10-29T13:00:00.000+00:00
Duration: 9 min 50 s
Description: Watch this Scientific Journal Video about Use of Synaptic Zinc Histochemistry to Reveal Different Regions and Laminae in the Developing and Adult Brain at JoVE.com

이 작품 연구 자원 (2G12RR03060-26A1);에 대 한 국립 센터에서 교부 금에 의해 지원 되었다 소수 민족 건강과 건강 격차 (8G12MD007603-27) 건강; 국립 보건원에서 국립 연구소 뉴욕 (CUNY PSC);의 전문 직원 의회 도시 대학 그리고 교수 연구 그랜트 (FRG II) 아메리칸 대학의 샤. 우리는 이러한 방법에 우리를 도입에 대 한 Vidyasagar Sriramoju 감사 합니다.

<ol>
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저자는 공개 없다.

현재 연구는 Danscher (1982) 방법10, 시 냅 스 아연 지역화를 감지 하 고 뇌에서 시각 수 있습니다 그것에 의하여의 수정된 된 버전에 따라 조직화 학적인 기술을 사용 합니다. 이 메서드는 기본적으로 아연 chelator 나트륨 selenite (나2서구3)를 가진 동물 (15 mg/kg)를 주입 하 여 작동 합니다. 주입, 따라는 selenite 두뇌에 여행 하 고 아연을 포함 하는 신경의 연 접 소포를 지?...

조직학 얼룩 전통적으로 건축 술 기능에 차이 공개 하 여 다양 한 종에서 대뇌 피 질의 영역 식별에서 돕기 위해 사용 되었습니다. 그들은 두뇌의 비슷한 면적 경계 공개 Nissl 물질, 시 토 크롬 산화 효소 (CO) 반응, 또는 수 초 같은 조직화 학적인 기술 사용 유익한 증명할 수 있다. 그러나, 이러한 조직화 학적인 얼룩 대뇌 피 질의 영역 및 미 성숙한 뇌에 레이어 사이의 명확한 경계를 항상 적절 하 게 공개 하지 않습니다.
중앙 신 경계, 아연에는 효소 공동 인자, 다양 한 규제 기능에 참여 하 고 시 냅 스 소포에 그것의 존재를 통해 neuromodulator 역할 역할 DNA 구조 안정화를 포함 하는 몇 가지 중요 한 기능 1. 시 냅 스 아연은 독특한 그것은 구상 될 수 있다 조직학 방법 반면 단백질 바인딩 아연 시각된2수 없습니다. 이 기능은 다른 대뇌 피 질의 영역에 시 냅 스 아연 패턴을 이용 되 고 시 냅 스 아연 histochemistry 연구의 숫자에 사용 되었습니다. 대뇌 피 질 신경 세포 glutamatergic의 하위 집합 포함 그들의 축 삭 맨끝3,4내 연 접 소포에 아연. 조직화 학적인 연구는 대뇌 피 질5,,67에서 시 냅 스 아연의 다른 유형의 분포를 계시 했다. 다른 대뇌 피 질의 영역 (예를 들어, 시각적 somatosensory 피 대), 또는 레이어 histochemically 반응 아연의 다른 영역 및 층 류 분포 나타납니다 (예를 들어,는 supragranular에 있는 아연 수준 및 기본 시각 피 질 infragranular 레이어는 상대적으로 낮은 시 냅 스 아연 레벨 thalamocortical 입력 계층 4 보다 실질적으로 더 높은)5,,89. 면적 및 층 류 식별을 용이 하 게 하는으로 시 냅 스 아연 피 질에 얼룩에 특히 유리 하다.
여기 우리는 Danscher의 1982 메서드10의 수정된 된 버전은 시 냅 스 아연 조직화 학적인 절차에 대 한 자세한 설명을 제시. 이 메서드는 chelating 에이전트로 동물에 selenite intraperitoneally 주입 (IP)를 사용합니다. selenite 두뇌 glutamatergic 시 냅 스의 부분 집합의 소포에 있는 자유로운 아연의 수영장으로 반응 하는 뇌에 여행. 이 반응은 실버 개발2,,1011이후 강화 될 수 있다 침전을 생성 합니다.
이 절차 시 냅 스 아연 얼룩;의 층 류 영역 패턴을 보여준다 densitometric 분석은 성인과 미 성숙한 뇌의 감각, 환경, 약물, 또는 유전자 조작 같은 다른 개입의 효과 연구에서 이러한 패턴을 질적 및 양적 평가를 사용할 수 있습니다. 또한, 하나 또한 다른 모델 시스템에 다른 피 질 또는 subcortical 구조에서 시 냅 스 아연의 분포에 잠재적인 발달 변화를 평가 하 고 있습니다. Densitometric 분석이 메서드에서 제공 하는 양적 정보는 시간이 지남에 따라 다음 두뇌 개발을 위한 유리한 될 수 있습니다. 이 프로토콜을 다른 면역-조직화 학적인 마커 동반자를 층 류 및 영역 경계를 표시를 제공 합니다.

<table><tbody><tr><td>Euthasol (Euthanasia solution)</td><td>Henry Schein</td><td>710101</td><td></td></tr><tr><td>Sodium selenite</td><td>Sigma-Aldrich</td><td>214485</td><td></td></tr><tr><td>Ketamine (Ketaved)</td><td>Henry Schein</td><td>48858</td><td>100 mg/ml injectables</td></tr><tr><td>Xylazine (Anased)</td><td>Henry Schein</td><td>33198</td><td>100 mg/ml injectables</td></tr><tr><td>Paraformaldehyde</td><td>Sigma-Aldrich</td><td>F8775</td><td>Dilute to 4%</td></tr><tr><td>Gum arabic</td><td>Sigma-Aldrich</td><td>G9752-500G</td><td></td></tr><tr><td>Citric acid</td><td>Sigma-Aldrich</td><td>C1909</td><td></td></tr><tr><td>Sodium citrate</td><td>Sigma-Aldrich</td><td>W302600</td><td></td></tr><tr><td>Hydroquinone</td><td>Sigma-Aldrich</td><td>H9003</td><td></td></tr><tr><td>Silver lactate</td><td>Sigma-Aldrich</td><td>85210</td><td></td></tr><tr><td>Fish gelatine</td><td>Sigma-Aldrich</td><td>G7765</td><td></td></tr><tr><td>Cytochrome c</td><td>Sigma-Aldrich</td><td>C2506</td><td>(Type III, from equine heart)</td></tr><tr><td>Catalse</td><td>Sigma-Aldrich</td><td>C10</td><td></td></tr><tr><td>Sucrose</td><td>Domino</td><td></td><td></td></tr><tr><td>Xylene</td><td>Fisher Scientific</td><td>X5P-1GAL</td><td></td></tr><tr><td>Permount</td><td>Fisher Scientific</td><td>SP15-500</td><td></td></tr><tr><td>100% Ethanol</td><td>Fisher Scientific</td><td>A406-20</td><td>Used for dehydration prior to slide mounting</td></tr><tr><td>Coverslips</td><td>Brain Research Laboratories</td><td>#3660-1</td><td></td></tr><tr><td>Frosted unsubbed slides</td><td>Brain Research Laboratories</td><td>#3875-FR</td><td></td></tr><tr><td>Microtome</td><td>American Optical Company</td><td>860</td><td></td></tr><tr><td>Microscope</td><td>Olympus</td><td>BX-60</td><td></td></tr><tr><td>Adope Photoshop</td><td>Adobe Systems, San Jose, CA</td><td></td><td>To assemble images</td></tr><tr><td>ImageJ</td><td>Free software can be downloaded at http://rsb.info.nih.gov/ij/</td><td></td><td>For densometric measurements</td></tr><tr><td>Plastic tray</td><td>Any standard plastic tray may be used</td><td></td><td>to immerse slides in developer solution</td></tr><tr><td>Hot plate</td><td>Any standard hotplate may be used</td><td></td><td></td></tr></tbody></table>

use of synaptic zinc histochemistry to reveal different regions and laminae in the developing and adult brain

해 부 학적 및 기능적 뇌 조직 및 개발의 고유한 신경 회로 지역 미 숙 하 고 성인 두뇌의 정확한 식별을 필요합니다. 여기는 다른 레이어 및 두뇌 영역 중에서 얼룩 패턴에 차이 밝혀 아연 조직화 학적인 얼룩 절차에 설명 합니다. 다른 사람을 아연 포함 된 신경 및 두뇌에서 회로의 분포 뿐만 아니라 성공적으로 여러 종에서 개발 및 성인 두뇌에 있는 영역 및 박판 모양 경계 윤곽을 그리 다이 절차를 활용 했습니다. 여기 우리가 설명이 절차 개발에서 이미지와 함께 얼룩 및 성인 흰 족제비 두뇌. 우리는 아연 얼룩 패턴 영역과 레이어의 해 부 감 적 역할을 계시 하 고 개발 및 성인 시각 피 질에서 시각 피 질 영역을 구별 하 안정적으로 사용할 수 있습니다. 이 프로토콜의 주요 목표는 레이어 및 지역 개발 및 성인 두뇌 그렇게 할 다른 방법이 실패 하는 곳에서 정확한 식별 수 있도록 조직화 학적인 방법을 제시 하는. Secondarily, densitometric 이미지 분석 함께,이 방법을 하나 수 있습니다 개발을 통해 잠재적인 변화를 공개 시 냅 스 아연의 분포를 평가 하. 시 약, 도구, 및 연속적으로 냉동된 뇌 섹션 얼룩 필요한 단계가이 프로토콜은 자세하게에서 설명 합니다. 하지만이 프로토콜 사용 하 여 흰 족제비 뇌 조직의 설명, 그것은 쉽게 설치류, 고양이, 또는 다른 뇌 영역에서 뿐만 아니라 원숭이에 사용 하기 위해 적용할 수 있습니다.

뇌 시 냅 스 아연에 대 한 섹션을 얼룩이 프로토콜에 관련 된 주요 단계는 그림 1의 순서도에 표시 됩니다. 프로토콜은 3 단계로 분할 될 수 있다: 1) 관류 및 조직 수집, 2) 조직 준비와 얼룩, 및 3) 아연 histochemistry. 간단히, 프로토콜의 첫 번째 단계 동물 마 취는 고 나트륨 selenite의 적절 한 복용량과 함께 IP를 주입. 기간 후에 충분 한 시간 (이상적으로 6...

Watch this Scientific Journal Video about Use of Synaptic Zinc Histochemistry to Reveal Different Regions and Laminae in the Developing and Adult Brain at JoVE.com

Use of Synaptic Zinc Histochemistry to Reveal Different Regions and Laminae in the Developing and Adult Brain

시 냅 스 아연 Histochemistry 다른 지역과 개발 및 성인 두뇌에서 하기의 사용

우리는 서로 다른 뇌 영역에 패턴을 얼룩이 지기 특성 박판 모양 및 면적 아연을 조직화 학적인 절차를 설명 합니다. 아연 얼룩 패턴 함께에서 다른 해 부 마커와 레이어 및 지역 개발 및 성인 두뇌에서 안정적으로 구별 하 사용할 수 있습니다.

Characterization of anatomical and functional brain organization and development requires accurate identification of distinct neural circuits and regions ...

use-synaptic-zinc-histochemistry-to-reveal-different-regions-laminae

Universidad de Cartagena UDEC

Research

JoVE Journal

Neuroscience

7.1K 조회수.  American University of Sharjah. 우리는 서로 다른 뇌 영역에 패턴을 얼룩이 지기 특성 박판 모양 및 면적 아연을 조직화 학적인 절차를 설명 합니다. 아연 얼룩 패턴 함께에서 다른 해 부 마커와 레이어 및 지역 개발 및 성인 두뇌에서 안정적으로 구별 하 사용할 수 있습니다.

비디오: Use of Synaptic Zinc Histochemistry to Reveal Different Regions and Laminae in the Developing and Adult Brain

Large-scale Scanning Transmission Electron Microscopy (Nanotomy) of Healthy and Injured Zebrafish Brain

Large-scale 2D electron microscopy (EM), or nanotomy, is the tissue-wide application of nanoscale resolution electron microscopy. Others and we previously applied large scale EM to human skin pancreatic islets, tissue culture and whole zebrafish larvae1-7. Here we describe a universally applicable method for tissue-scale scanning EM for unbiased detection of sub-cellular and molecular features. Nanotomy was applied to investigate the healthy and a neurodegenerative zebrafish brain. Our method is based on standardized EM sample preparation protocols: Fixation with glutaraldehyde and osmium, followed by epoxy-resin embedding, ultrathin sectioning and mounting of ultrathin-sections on one-hole grids, followed by post staining with uranyl and lead. Large-scale 2D EM mosaic images are acquired using a scanning EM connected to an external large area scan generator using scanning transmission EM (STEM). Large scale EM images are typically ~ 5 - 50 G pixels in size, and best viewed using zoomable HTML files, which can be opened in any web browser, similar to online geographical HTML maps. This method can be applied to (human) tissue, cross sections of whole animals as well as tissue culture1-5. Here, zebrafish brains were analyzed in a non-invasive neuronal ablation model. We visualize within a single dataset tissue, cellular and subcellular changes which can be quantified in various cell types including neurons and microglia, the brain&#39;s macrophages. In addition, nanotomy facilitates the correlation of EM with light microscopy (CLEM)8 on the same tissue, as large surface areas previously imaged using fluorescent microscopy, can subsequently be subjected to large area EM, resulting in the nano-anatomy (nanotomy) of tissues. In all, nanotomy allows unbiased detection of features at EM level in a tissue-wide quantifiable manner.

Large-scale Scanning Transmission Electron Microscopy Nanotomy of Healthy and Injured Zebrafish Brain

Large-scale 2D electron microscopy (EM), or nanotomy, is the tissue-wide application of nanoscale resolution EM. Here we describe a universal method for nanotomy applied to investigate the zebrafish larval brain in health and upon non-invasive brain injury.

건강 및 부상 Zebrafish의 두뇌의 대규모 스캐닝 투과 전자 현미경 (Nanotomy)

Large-scale 2D electron microscopy (EM), or nanotomy, is the tissue-wide application of nanoscale resolution electron microscopy. Others and we previously ...

연구

발생학

Preparation of Acute Subventricular Zone Slices for Calcium Imaging

The subventricular zone (SVZ) is one of the two neurogenic zones in the postnatal brain. The SVZ contains densely packed cells, including neural progenitor cells with astrocytic features (called SVZ astrocytes), neuroblasts, and intermediate progenitor cells. Neuroblasts born in the SVZ tangentially migrate a great distance to the olfactory bulb, where they differentiate into interneurons. Intercellular signaling through adhesion molecules and diffusible signals play important roles in controlling neurogenesis. Many of these signals trigger intercellular calcium activity that transmits information inside and between cells. Calcium activity is thus reflective of the activity of extracellular signals and is an optimal way to understand functional intercellular signaling among SVZ cells.
Calcium activity has been studied in many other regions and cell types, including mature astrocytes and neurons. However, the traditional method to load cells with calcium indicator dye (i.e. bath loading) was not efficient at loading all SVZ cell types. Indeed, the cellular density in the SVZ precludes dye diffusion inside the tissue. In addition, preparing sagittal slices will better preserve the three-dimensional arrangement of SVZ cells, particularly the stream of neuroblast migration on the rostral-caudal axis.
Here, we describe methods to prepare sagittal sections containing the SVZ, the loading of SVZ cells with calcium indicator dye, and the acquisition of calcium activity with time-lapse movies. We used Fluo-4 AM dye for loading SVZ astrocytes using pressure application inside the tissue. Calcium activity was recorded using a scanning confocal microscope allowing a precise resolution for distinguishing individual cells. Our approach is applicable to other neurogenic zones including the adult hippocampal subgranular zone and embryonic neurogenic zones. In addition, other types of dyes can be applied using the described method.

A method to load subventricular zone (SVZ) cells with calcium indicator dyes for recording calcium activity is described. The postnatal SVZ contains tightly packed cells including neural progenitor cells and neuroblasts. Rather than using bath loading we injected the dye by pressure inside the tissue allowing better dye diffusion.

칼슘 이미징에 대한 급성 Subventricular 지대 슬라이스의 작성

The subventricular zone (SVZ) is one of the two neurogenic zones in the postnatal brain. The SVZ contains densely packed cells, including neural ...

신경과학

Assessment of Ultrastructural Neuroplasticity Parameters After In Utero Transduction of the Developing Mouse Brain and Spinal Cord

The present study combines in utero transduction with transmission electron microscopy (TEM) aiming at a precise morphometrical analysis of ultrastructural parameters in unambiguously identified topographical structures, affected by a protein of interest that is introduced into the organism via viral transfer. This combined approach allows for a smooth transition from macrostructural to ultrastructural identification by following topographical navigation maps in a tissue atlas. High-resolution electron microscopy of the in-utero-transduced tissue reveals the fine ultrastructure of the neuropil and its plasticity parameters, such as cross-sectioned synaptic bouton areas, the number of synaptic vesicles and mitochondria within a bouton profile, the length of synaptic contacts, cross-sectioned axonal areas, the thickness of myelin sheaths, the number of myelin lamellae, and cross-sectioned areas of mitochondria profiles. The analysis of these parameters reveals essential insights into changes of ultrastructural plasticity in the areas of the nervous system that are affected by the viral transfer of the genetic construct. This combined method can not only be used for studying the direct effect of genetically engineered biomolecules and/or drugs on neuronal plasticity but also opens the possibility to study the in utero rescue of neuronal plasticity (e.g., in the context of neurodegenerative diseases).

The combination of transmission electron microscopy and in utero transduction is a powerful approach for studying morphological changes in the fine ultrastructure of the nervous system during development. This combined method allows deep insights into changes in structural details underlying neuroplasticity with respect to their topographical representation.

평가의 개발 쥐의 뇌와 척수의 Utero 변환 후 Ultrastructural Neuroplasticity 매개 변수

The present study combines in utero transduction with transmission electron microscopy (TEM) aiming at a precise morphometrical analysis of ...

Stab Wound Injury of the Zebrafish Adult Telencephalon: A Method to Investigate Vertebrate Brain Neurogenesis and Regeneration

Adult zebrafish have an amazing capacity to regenerate their central nervous system after injury. To investigate the cellular response and the molecular mechanisms involved in zebrafish adult central nervous system (CNS) regeneration and repair, we developed a zebrafish model of adult telencephalic injury.
In this approach, we manually generate an injury by pushing an insulin syringe needle into the zebrafish adult telencephalon. At different post injury days, fish are sacrificed, their brains are dissected out and stained by immunohistochemistry and/or in situ hybridization (ISH) with appropriate markers to observe cell proliferation, gliogenesis, and neurogenesis. The contralateral unlesioned hemisphere serves as an internal control. This method combined for example with RNA deep sequencing can help to screen for new genes with a role in zebrafish adult telencephalon neurogenesis, regeneration, and repair.

To shed light on the cellular and molecular mechanisms of zebrafish adult neurogenesis and regeneration, we developed a protocol for invasive surgery causing mechanical injuries in the zebrafish adult telencephalon and subsequent monitoring of changes in the stabbed hemisphere by immunohistochemistry or in situ hybridization.

Zebrafish의 성인 Telencephalon의 자상 부상 : 척추 동물의 뇌 신경 발생과 재생을 조사하는 방법

Adult zebrafish have an amazing capacity to regenerate their central nervous system after injury. To investigate the cellular response and the molecular ...

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.

고해상도를 사용하여 뇌 섹션에서 Axonally 지역화 된 mRNA를 검출<em&gt; 현장에서</em&gt; 하이브리드

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

Immunostaining of Biocytin-filled and Processed Sections for Neurochemical Markers

Electrophysiological recordings of cells using the patch clamp technique have allowed for the identification of different neuronal types based on firing patterns. The inclusion of biocytin/neurobiotin in the recording electrode permits post-hoc recovery of morphological details, which are necessary to determine the dendritic arborization and the regions targeted by the axons of the recorded neurons. However, given the presence of morphologically similar neurons with distinct neurochemical identities and functions, immunohistochemical staining for cell-type-specific proteins is essential to definitively identify neurons. To maintain network connectivity, brain sections for physiological recordings are prepared at a thickness of 300 &#181;m or greater. However, this thickness often hinders immunohistological postprocessing due to issues with antibody penetration, necessitating the resectioning of the tissue. Resectioning of slices is a challenging art, often resulting in the loss of tissue and morphology of the cells from which electrophysiological data was obtained, rendering the data unusable. Since recovery of morphology would limit data loss and guide in the selection of neuronal markers, we have adopted a strategy of recovering cell morphology first, followed by secondary immunostaining. We introduce a practical approach to biocytin filling during physiological recordings and subsequent serial immunostaining for the recovery of morphology, followed by the restaining of sections to determine the neurochemical identity. We report that sections that were filled with biocytin, fixed with paraformaldehyde (PFA), stained, and coverslipped can be removed and restained with a second primary antibody days later. This restaining involves the removal of the coverslip, the washing of sections in a buffer solution, and the incubation of primary and secondary antibodies to reveal the neurochemical identity. The method is advantageous for eliminating data loss due to an inability to recover morphology and for narrowing down the neurochemical markers to be tested based on morphology.

This protocol presents a method for the morphological recovery of neurons patched during electrophysiological recordings using biocytin filling and subsequent immunohistochemical postprocessing. We show that thick biocytin-filled sections that were stained and coverslipped can be restained with a second primary antibody days&#160;or months later.

신경 화학적 마커에 대한 Biocytin 충전 및 가공 섹션의 면역 염색

Electrophysiological recordings of cells using the patch clamp technique have allowed for the identification of different neuronal types based on firing ...

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices

In the brain, synapses are specialized junctions between neurons, determining the strength and spread of neuronal signaling. The number of synapses is tightly regulated during development and neuronal maturation. Importantly, deficits in synapse number can lead to cognitive dysfunction. Therefore, the evaluation of synapse number is an integral part of neurobiology. However, as synapses are small and highly compact in the intact brain, the assessment of absolute number is challenging. This protocol describes a method to easily identify and evaluate synapses in hippocampal rodent slices using immunofluorescence microscopy. It includes a three-step procedure to evaluate synapses in high-quality confocal microscopy images by analyzing the co-localization of pre- and postsynaptic proteins in hippocampal slices. It also explains how the analysis is performed and gives representative examples from both excitatory and inhibitory synapses. This protocol provides a solid foundation for the analysis of synapses and can be applied to any research investigating the structure and function of the brain.

A protocol for accurately identifying and analyzing synapses in hippocampal slices using immunofluorescence is outlined in this article.

시 냅 스 밀도 Hippocampal 설치류 두뇌 분할 영역에서의 평가

In the brain, synapses are specialized junctions between neurons, determining the strength and spread of neuronal signaling. The number of synapses is ...

Biocytin Recovery and 3D Reconstructions of Filled Hippocampal CA2 Interneurons

How cortical network activity processes information is of importance to a large number of basic and clinical scientific questions. The protocol described here identifies the basic building blocks of this circuitry. The in-depth studies of cortical regions will ultimately provide other scientists with the circuit components needed for an understanding of how the brain acquires, processes and stores information and what goes wrong in disease, while the electrophysiological and morphological data are widely used by computational neuroscientists in the construction of model networks that explore information processing. The protocol outlined here describes how biocytin-filled cells recorded in the CA2 region of the hippocampus are recovered and then reconstructed in&#160;3D. Additionally, the protocol describes the demonstration of calcium binding protein or peptide content in recorded interneurons.

The protocol outlined here describes the immunofluorescence analysis, biocytin recovery and high-quality reconstructions of hippocampal CA2 interneurons following the intracellular electrophysiological recordings in vitro, allowing neuronal characterization and ultimately fine neuronal anatomy to be studied.

Biocytin 복구 및 채워진된 Hippocampal CA2 수의 3D 복원

How cortical network activity processes information is of importance to a large number of basic and clinical scientific questions. The protocol described ...

Localization of the Locus Coeruleus in the Mouse Brain

The locus coeruleus (LC) is a major hub of norepinephrine producing neurons that modulate a number of physiological functions. Structural or functional abnormalities of LC impact several brain regions including cortex, hippocampus, and cerebellum and may contribute to depression, bipolar disorder, anxiety, as well as Parkinson disease and Alzheimer disease. These disorders are often associated with metal misbalance, but the role of metals in LC is only partially understood. Morphologic and functional studies of LC are needed to better understand the human pathologies and contribution of metals. Mice are a widely used experimental model, but the mouse LC is small (~0.3 mm diameter) and hard to identify for a non-expert. Here, we describe a step-by-step immunohistochemistry-based protocol to localize the LC in the mouse brain. Dopamine-&#946;-hydroxylase (DBH), and alternatively, tyrosine hydroxylase (TH), both enzymes highly expressed in the LC, are used as immunohistochemical markers in brain slices. Sections adjacent to LC-containing sections can be used for further analysis, including histology for morphological studies, metabolic testing, as well as metal imaging by X-ray fluorescence microscopy (XFM).

The locus coeruleus is a small cluster of neurons involved in a variety of physiological processes. Here, we describe a protocol to prepare mouse brain sections for studies of proteins and metals in this nucleus.

쥐의 뇌에서 로커 스 Coeruleus의 지역화

The locus coeruleus (LC) is a major hub of norepinephrine producing neurons that modulate a number of physiological functions. Structural or functional ...

Preparation of Newborn Rat Brain Tissue for Ultrastructural Morphometric Analysis of Synaptic Vesicle Distribution at Nerve Terminals

Our laboratory and many others have exploited the high resolving power of transmission electron microscopy to study the morphology and spatial organization of synaptic vesicles. In order to obtain high-quality electron micrographs that can yield the degree of morphological detail necessary for quantitative analysis of pre-synaptic vesicle distribution, optimal specimen preparation is critical. Chemical fixation is the first step in the process of specimen preparation, and of utmost importance to preserve fine ultrastructure. Vascular fixation with a glutaraldehyde-formaldehyde solution, followed by treatment of vibratome-sectioned specimens with osmium tetroxide, stabilizes the maximum number of molecules, especially proteins and lipids, and results in superior conservation of ultrastructure. Tissue is then processed with counterstaining, sequential dehydration and resin-embedding. En bloc staining with uranyl acetate (i.e., staining of vibratome-sectioned tissue before resin embedding) enhances endogenous contrast and stabilizes cell components against extraction during specimen processing. Contrast can be further increased by applying uranyl acetate as a post-stain on ultrathin sections. Double-staining of ultrathin sections with lead citrate after uranyl acetate treatment also improves image resolution, by intensifying electron-opacity of nucleic acid-containing structures through selective binding of lead to uranyl acetate. Transmission electron microscopy is a powerful tool for characterization of the morphological details of synaptic vesicles and quantification of their size and spatial organization in the terminal bouton. However, because it uses fixed tissue, transmission electron microscopy can only provide indirect information regarding living or evolving processes. Therefore, other techniques should be considered when the main objective is to study dynamic or functional aspects of synaptic vesicle trafficking and exocytosis.

We describe procedures for processing newborn rat brain tissue to obtain high-resolution electron micrographs for morphometric analysis of synaptic vesicle distribution at nerve terminals. The micrographs obtained with these methods can also be used to study the morphology of a number of other cellular components and their dimensional structural relationships.

시 냅 스 아연 Histochemistry 다른 지역과 개발 및 성인 두뇌에서 하기의 사용

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