hemidesmosomes การใช้

• This effect also led to a lack of hemidesmosomes in the developing tissue.
• Hemidesmosomes are structures which link the basal lamina to the intermediate filament cytoskeleton.
• Hemidesmosomes provide anchorage between cells through small filament-like structures provided by the remnants of ameloblasts.
• However, unlike the lamina densa, the electron-dense zone adjacent to enamel show no signs of hemidesmosomes.
• An important functional component of hemidesmosomes is the integrin beta-4 subunit ( ITGB4 ), a protein containing two fibronectin type III domains.
• This cytoskeletal disorganization also leads to a loss of anchorage to the hemidesmosomes and desmosomes, causing basal cells to lose their linkage with the basal lamina and each other.
• The electron-lucent zone is adjacent to the cells of the junctional epithelium and might be considered a continuation of the lamina lucida as both are seen to harbour hemidesmosomes.
• Much about gingival formation is not fully understood, but it is known that hemidesmosomes form between the gingival epithelium and the tooth and are responsible for the " primary epithelial attachment ".
• Before they begin to migrate, cells must dissolve their desmosomes and hemidesmosomes, which normally anchor the cells by intermediate filaments in their cytoskeleton to other cells and to the ECM . Transmembrane receptor proteins called integrins, which are made of glycoproteins and normally anchor the cell to the basement membrane by its cytoskeleton, are released from the cell's intermediate filaments and relocate to actin filaments to serve as attachments to the ECM for pseudopodia during migration.