Dr Mah Jabeen Muneera Assistant Professor Department of Anatomy KEMU.

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Presentation transcript:

Dr Mah Jabeen Muneera Assistant Professor Department of Anatomy KEMU

Shape: double sranded helix Diameter: 7nm Basic protein subunit: monomer of G-actin (globular or free actin) polymerizes to F- actin (filamentous), in presence of K & Mg. Formin Polarity: _ pointed end and + barbed end Treadmilling Stable- muscle cells and microvilli Dissociate and reassemble Profilin & Cofilin

Prevent polymerization Prevent depolymerization (phalloidin found in poisosnous mushrooms) Disrupt the dynamic equilibrium between F-actin and G-actin causing cell death

Core of actin filaments ABPs- Actin Binding Proteins Villin and fimbrin Tropomyosin Spectrin Myosin 1 and 2

10-12nm Structural function Intercellular junctions Nuclear lamina Identification by means of immunocytochemical methods Tissue specificity

DesmosomesZonula adherens

Fibroblasts: Cells of mesenchymal origin- ? IF ›50 different types divided into 05 classes 1. Keratins- epithelium 2. Vimentin- mesenchymal cells and vascular smooth muscle 3. Desmin- muscle except vascular smooth muscle 4. Glial fibrillary acidic proteins- glial cells 5. Neurofilaments- neurons

Presence of a specific type of intermediate filament in tumors can reveal which cell originated the tumor Identification of intermediate filament proteins by means of immunocytochemical methods is a routine procedure

Microvilli bearing cells Microfilaments & intermediate filaments Desmosomes anchorage ABP: spectrin & Myosin II

Neurofibrillary tangles: presence of structurally abnormal but phosphorylated neurofilaments and microtubule associated proteins ??

Disorder of CNS Mutations in the coding region of GFAP gene Altered GFAP prevents the assembly of intermediate filaments Accumulation of intermediate filament protein GFAP leads to cytoplasmic inclusions in astrocytes (Rosenthal fibres)