Neurofilaments usually contain three intermediate filament proteins: L, M, and H which are involved in the maintenance of neuronal caliber. NF-H has an important function in mature axons that is not subserved by the two smaller NF proteins. Neurofilament-H (NF-H), also known as neurofilament heavy polypeptide, and Neurofilament-L (NF-L), also known as neurofilament light polypeptide, members of the intermediate filament family, are major components of neuronal cytoskeletons. Neurofilaments are dynamic structures; they contain phosphorylation sites for a large number of protein kinases, including protein kinase A, protein kinase C, cyclin-dependent kinase 5, extracellular signal regulated kinase, glycogen synthase kinase-3, and stress-activated protein kinase gamma. In addition to their role in the control of axon caliber, neurofilaments may affect other cytoskeletal elements, such as microtubules and Actin filaments. Changes in neurofilament phosphorylation or metabolism are frequently observed in neurodegenerative diseases, including amyotrophic lateral sclerosis (ALS), Parkinson's disease and Alzheimer's disease.
Background References
1. Medina-Rodruez EM et al. Promoting in vivo remyelination with small molecules: a neuroreparative pharmacological treatment for Multiple Sclerosis. Sci Rep 7:43545 (2017).
2. Vasconcelos DM et al. Immune response and innervation signatures in aseptic hip implant loosening. J Transl Med 14:205 (2016).
Sequence Similarity
Belongs to the intermediate filament family.
Post-translational Modification
There are a number of repeats of the tripeptide K-S-P, NFH is phosphorylated on a number of the serines in this motif. It is thought that phosphorylation of NFH results in the formation of interfilament cross bridges that are important in the maintenance of axonal caliber.; Phosphorylation seems to play a major role in the functioning of the larger neurofilament polypeptides (NF-M and NF-H), the levels of phosphorylation being altered developmentally and coincidentally with a change in the neurofilament function.; Phosphorylated in the head and rod regions by the PKC kinase PKN1, leading to the inhibition of polymerization.
Immunocytochemistry analysis of Neuro-2a cells labeling Neurofilament with Rabbit anti-Neurofilament antibody (R1706-17) at 1/50 dilution.
Cells were fixed in 4% paraformaldehyde for 15 minutes at room temperature, permeabilized with 0.1% Triton X-100 in PBS for 15 minutes at room temperature, then blocked with 1% BSA in 10% negative goat serum for 1 hour at room temperature. Cells were then incubated with Rabbit anti-Neurofilament antibody (R1706-17) at 1/50 dilution in 1% BSA in PBST overnight at 4 ℃. Goat Anti-Rabbit IgG H&L (iFluor™ 488, HA1121) was used as the secondary antibody at 1/1,000 dilution. PBS instead of the primary antibody was used as the secondary antibody only control. Nuclear DNA was labelled in blue with DAPI.
Beta tubulin (M1305-2, red) was stained at 1/100 dilution overnight at +4℃. Goat Anti-Mouse IgG H&L (iFluor™ 594, HA1126) was used as the secondary antibody at 1/1,000 dilution.
Immunohistochemical analysis of paraffin-embedded rat brain tissue using anti-Neurofilament antibody. Counter stained with hematoxylin.
Immunohistochemical analysis of paraffin-embedded mouse brain tissue using anti-Neurofilament antibody. Counter stained with hematoxylin.
Western blot analysis of Neurofilament on different lysates with Rabbit anti-Neurofilament antibody (R1706-17) at 1/1,000 dilution.
Lane 1:mouse brain tissue lysate
Lysates/proteins at 40 µg/Lane. Exposure time: 62 seconds; ECL: K1801
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: R1706-17, 1/1,000 in primary antibody dilution buffer (K1803), overnight at 4 ℃ Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 112 kDa Observed band size: 200 kDa
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