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Aβ exists in both soluble and fibrillar forms.
Homer-Wright rosettes are pseudorosettes consisting of tumor cells surrounding a fibrillar area.
The nuclear lamina is a dense ( 30 to 100 nm thick) fibrillar network inside the nucleus of a eukaryotic cell.
Mainly fibrillar collagens type I and III serve as ligands.
In time this in turn is replaced by coarse, fibrillar bone and finally by mature, woven bone.
This fibrillar network of collagen allows cartilage to entrap the proteoglycan aggregate as well as provide tensile strength to the tissue.
Nucleation: Collagen, in the presence of certain neutral salt molecules can act as a nucleating agent causing formation of fibrillar structures.
The capacity of taxifolin to stimulate fibril formation and promote stabilization of fibrillar forms of collagen can be used in medicine.
If most of the protein contains intermolecular hydrogen bonds it is said to be fibrillar, and the majority of its secondary structure will be beta sheets.
Binding of the α5β1 integrin to its ligand (fibronectin) activates the formation of fibrillar adhesions and actin filaments.
Yet, if the ECM is immobilized, matrix reorganization of this kind and formation of fibrillar adhesions is inhibited.
Furthermore, during hepatic fibrosis there is replacement of the normal matrix with interstitial or fibrillar collagens (predominantly types I and III).
Furthermore, an increase in total fibrillar collagens, fibronectins, proteoglycans, and tenascin C are distinctive of the desmoplastic stromal response in several forms of cancer.
They function as receptors for different collagen types, they recognize many fibrillar collagens and they are capable of binding some nonfibrillar collagens as well.
With type I collagen and possibly all fibrillar collagens if not all collagens, each triple-helix associates into a right-handed super-super-coil referred to as the collagen microfibril.
The fibrillar form of fibronectin is thought to be the most relevant form in vivo because this is the form with which most cells interact [ 1 ] .
For example, high concentrations of dimeric fibronectin enhance cell migration whereas high concentrations of fibrillar fibronectin reduce cell migration [ 2 ] .
Insect flight muscle is said to be fibrillar, in that it contracts in response to being stretched by antagonistic muscle, so as to allow very rapid (up to 1000 Hz) contraction.
Furthermore, evidence has emerged that small, non-fibrillar protein aggregates known as oligomers are toxic to the cells of an affected organ, and that amyloidogenic proteins in their fibrillar form may be relatively benign.
This model has refined over the years: Semi-crystalline regions were found as well as a fibrillar skin core model suggested for spider silk, later visualized by AFM and TEM.
The plaques are composed of a tangle of regularly ordered fibrillar aggregates called amyloid fibers, a protein fold shared by other peptides such as the prions associated with protein misfolding diseases.
Combined Doxycycline and TUDCA treatment (in human tolerable doses) significantly lowered fibrillar Transthyretin (TTR) amyloid deposition in transgenic TTR mouse models.
When microglia interact with the deposited fibrillar forms of β-amyloid it leads to the conversion of the microglia into an activated cell and results in the synthesis and secretion of cytokines and other proteins that are neurotoxic.
Subsequent research has shown that many different proteins can form amyloid, and that all amyloids have in common birefringence in cross-polarized light after staining with the dye Congo Red, as well as a fibrillar ultrastructure when viewed with an electron microscope.
It is evident from the known collagen assembly that the tensile strength is basically due to fibrillar arrangement of collagen molecules, which self-assemble into microfibrils in a longitudinal as well as lateral manner producing extra strength and stability to the collagen assembly.