Preparation of tissues for study
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1 Preparation of tissues for study
2 HISTOLOGY : It is the branch of science which deals with the microscopic study of normal tissue HISTOPATHOLOGY : It is the branch of science which deals with the microscopic study of tissue affected by disease Tissue for study can be obtained from: Biopsies Autopsies
3 Microtechnique Microtechnique: is tissue preparation for microscopic examination There are different methods used, however the basic principles are similar It usually involves hardening of the tissue followed by sectioning (cutting) - Paraffin technique - Freezing technique
4 Histological Techniques: 1. Paraffin Tissues are hardened by replacing water with paraffin 2. Freezing technique: Water-rich tissues are hardened by freezing and cut frozen
5 Freezing technique is much faster than traditional histology (20 minutes vs. 16 hours) and are used in operations to achieve a quick diagnosis Cryosections can also be used in immunohistochemistry as freezing tissue does not alter or mask its chemical composition
6 Protocols followed in Histotechniques 1. Identification & Labeling of the specimen 2. Fixation 3. Dehydration 4. Clearing 5. Impregnation (infiltration) 6. Embedding 7. Section cutting 8. Staining 9. Mounting
7 Labeling
8 Cassette
9 Fixation This is the process by which the constituents of cells and tissue are fixed in a physical and chemical state so that they will withstand subsequent treatment with various reagents with minimum loss of architecture This is achieved by exposing the tissue to chemical compounds: fixatives Fixatives prevent autolysis and bacterial decomposition and preserves tissue in their natural state and fix all components
10 Tissue fixatives Buffered formalin (light microscope preparation) Buffered gluteraldehyde (electron microscope preparation) Osmium tetraoxide (electron microscope preparation, preserve and stain) Zenker s formal saline Bowen s fluid
11 No fixative will penetrate a piece of tissue thicker than 1 cm.
12 Specimen is placed in porous cassettes
13 Cassettes are collected in fixatives 10% formalin 1mm/hour fixation
14 Processing
15 Tissue Processing In order to cut thin sections of the tissues, it should have suitable hardness and consistency when presented to the knife edge. These properties can be imparted by infiltrating and surrounding the tissue with paraffin wax, various types of resins or by freezing. This process is called tissue processing.
16 Tissue Processing It can be subdivided into: a) Dehydration b) Clearing c) Impregnation (infiltration)
17 Types of tissue processing There are two types : 1. Manual Tissue Processing 2. Mechanical Tissue Processing
18 Manual Tissue Processing In this process the tissue is changed from one container of reagent to another by hand Note: The processing, whether manually or mechanically, involves the same steps and reagents in same sequence
19 Mechanical Tissue Processing In this the tissue is moved from one jar to another by mechanical device Timings are controlled by a timer which can be adjusted in respect to hours and minutes Temperature is maintained around 60 ºC Automatic tissue processor: Overnight 12 Baths 16 hours
20 Tissues processor
21 Tissue basket
22 Dehydration (removal of water) It is the process in which the water content in the tissue to be processed is completely removed by passing the tissue through increasing concentrations of dehydrating agents Tissues are dehydrated by using increasing strength of alcohol; e.g. 70%, 90% and 100% Water is replaced by diffusion
23 During dehydration water in tissue has been replaced by alcohol The next step alcohol should be replaced by paraffin wax As paraffin wax is not alcohol soluble, we replace alcohol with a substance in which wax is soluble. This step is called clearing.
24 Clearing Replacing the dehydrating fluid with a fluid that is totally miscible with both the dehydrating fluid (alcohol) and the embedding medium (wax) Some clearing agents: - Xylene - Toluene - Chloroform - Benzene
25 Impregnation (infiltration): The tissue is kept in a wax bath containing molten paraffin wax
26 The duration of the procedure can be noted down as: Fixation % Formalin saline (I) for 1.5 hours % Formalin saline (II) for 1.5 hours Dehydration % alcohol for 1 hour % alcohol (I) for 1 hour % alcohol (II) for 1 hour 4. Absolute alcohol (100%) (I) for 1 hour 5. Absolute alcohol (100%) (II) for 1 hour 6. Absolute alcohol (100%) (III) for 1 hour
27 Clearing: 1. Xylene (I) for 1.5 hours 2. Xylene (II) for 1.5 hours Infiltration: 1. Paraffin wax (I) for 1.5 hours 2. Paraffin wax (II) for 1.5 hours
28 Embedding Embedding: is the process by which impregnated tissues are surrounded by a medium such as agar, gelatin, or wax which when solidified will provide sufficient external support during sectioning
29 Embedding: It is done by transferring the tissue to a mould filled with molten wax & is allowed to cool & solidify After solidification, a wax block is obtained which is then sectioned to obtain ribbons
30 Embedding tools Moulds Paraffin wax
31 Embedding Centre
32 Embedding Centre Molten wax (60 C) (reservoir) Used lids Heated chambers Wax flow adjuster Mould Hot surface Cassette Cold plates (-5 C) Wax dispenser
33 General Embedding Procedure
34 Fill the mould with paraffin wax
35 Using warm forceps select the tissue, take care that it does not cool in the air
36 Orienting the tissue in the mould
37 Orientation Of Tissue In The Block Correct orientation of tissue in a mould is the most important step in embedding 1. cross section 2. longitudinal section Incorrect placement of tissues may result in diagnostically important tissue elements being missed or damaged during microtomy
38 Cool the block on the cold plate
39 Blocks on the cold plate
40 Remove the block from the mould
41 Blocks of embedded tissue are usually trimmed to remove the excess wax on the surface
42 Sectioning (Section Cutting) It is the procedure in which the blocks which have been prepared are cut or sectioned and thin strips of uniform thickness are prepared The instrument by which this is done is called as a Microtome
43 TYPES OF MICROTOMES: Rotary microtome Freezing (cryostat) microtome Ultramicrotome
44 Rotary Microtome Micron adjustment (section thickness) 1-30µm Steel knife Paraffin Block
45 Freezing (Cryostat) microtome
46 Ultra Microtome Used for very thin section The typical thickness of tissue cut is between nm for TEM Knife: Diamond or Glass
47 Ultra Microtome Diamond Knife
48 Glass Knife Ultra Microtome
49 Sectioning: Ribbon of sections
50 Tissue floatation bath It is a thermostatically controlled water bath It is maintained at a temperature 5 6 degrees below the melting point of paraffin wax
51 Flattened paraffin sections
52 Taking the floating sections onto slide Adhesives used for fixing the sections on the slides Albumin solution ( Mayor s egg albumin)
53 Taking the section onto slide Flat, no air bubbles, no stretch or breaks
54 Staining Staining is a process by which we give colour to a section. Staining of the section is done to bring out the particular details in the tissue under study There are hundreds of stains available The most commonly used stain in routine practice is Hematoxylin & Eosin stain
55 Staining Classification of Stains: Acid stains (ex. Eosin) Basic stains (ex. Hematoxylin)
56 Acid Dyes In an acidic dye: The basic component is colored and the acid component is colorless Acid dyes stain basic components e.g. eosin stains cytoplasm The color imparted is shade of red
57 Basic Dyes In a basic dye: The acid component is colored and the basic component is colorless Basic dyes stain acidic components e.g. Hematoxylin stains nucleus The color imparted is shade of blue
58 Result : The nucleus stains Blue The cytoplasm stains pink
59 Procedure of staining: There are two types of staining: Manual Staining Automatic staining Slides stained either manually or by automatic stainer, pass through same sequences of reagents.
60 Manual Staining
61 Automatic stainer
62 Mounting Stained section on microscope slide is mounted using mounting medium dissolved in xylene Examples of Mountants : DPX ( Distrene Dibutyl phthalate Xylene ) A coverslip is placed on top, to protect the sample
63
64
65 Light Microscopic Examination
66 Concerning Electron Microscopy Electron beam instead of light Gluteraldehyde fixative Embedding is in hard epoxy plastic Ultramicrotome Diamond or Glass knives Thin section ( µm). Specimen is mounted on a metal grid
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