Anti-Neurofilament M (NF-M) antibody ValidAbTM

(HB7849)
Technical documents: SDS Datasheet

Product overview

Name Anti-Neurofilament M (NF-M) antibody ValidAbTM
Description

Antibody to Neurofilament M - neurofilament component expressed in neurones. Part of the ValidAb™ range of highly validated, data-rich antibodies.

Host Mouse
Clonality Monoclonal
Target Neurofilament M
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Validation data

Figure 1. Neurofilament M expression in cultured rat neurones visualised using HB7849.

HB7849 visualised the dense neurofilament network of cultured rat neurones. Method: neurones were cultured from PND2 rats following established protocols (Brewer and Torricelli, 2007. Nat Protoc 2, 1490–1498) and fixed with 4% PFA on DIV21. Cells were permeabilised with 0.1% Triton X-100 followed by blocking in 1% BSA, 300mM glycine. HB7849 was incubated overnight (4°C) at a 1:1000 dilution (1µg/ml) followed by a one hour incubation with secondary antibody (Polyclonal goat anti-mouse DyLight 488 conjugated, Thermofisher 35503, 1:300 dilution). DAPI (HB0747) was used at 1µg/ml to visualise cell nuclei. For more detail please see our ICC protocol. Images were captured using a Leica SPE confocal laser scanning microscope coupled to a Leica DMi8 inverted epifluorescence microscope. The image was captured using a 63x objective, 405nm (15.0% power, gain: 618) and 488nm (35.1% power, gain: 684) laser lines in a z-stack (0.35 µm spacing). Deconvolution was carried out using Huygens Essential version (Scientific Volume Imagine) followed by the stack being flattened using a maximum Z projection in ImageJ (Schindelin et al., 2012. Nat Methods, 9(7), 676–682).

Figure 2. The effect of varying HB7849 concentration upon staining in cultured rat neurones.

HB7849 produced a strong signal to noise ratio at dilutions as low as 1 in 8000 (125 ng/ml). Method: neurones were cultured from PND2 rats following established protocols (Brewer and Torricelli, 2007. Nat Protoc 2, 1490–1498) and fixed with 4% PFA on DIV21. Cells were permeabilised with 0.1% Triton X-100 followed by blocking in 1% BSA, 300mM glycine. HB7849 was incubated overnight (4°C) at dilutions ranging from 1:1000 (1µg/ml) to 1:8000 (0.125µg/ml) with a no primary step omitting the addition of HB7849 to the incubation buffer. This was followed by a one hour incubation with secondary antibody (Polyclonal goat anti-mouse DyLight 488 conjugated, Thermofisher 35503, 1:300 dilution). DAPI (HB0747) was used at 1µg/ml to visualise cell nuclei. For more detail please see our ICC protocol. Images were captured using a Leica DMi8 inverted epifluorescence microscope (40x objective) in a z-stack (1µm spacing) coupled to a Leica DFC365FX monochrome digital camera with DAPI LP and FITC LP filters. Exposure times were as follows: 

  • 1:1000 – DAPI 7.9ms, FITC 50.5ms
  • 1:2000 – DAPI 10ms, FITC 63.9ms
  • 1:4000 – DAPI 7.5ms, FITC 50ms
  • 1:8000 – DAPI 7.5ms, FITC 50ms


Images were processed in ImageJ (Schindelin et al., 2012. Nat Methods, 9(7), 676–682) using the subtract background (50px rolling ball radius) tool followed by Z-projection, stacking and montage creation. 

Figure 3. Neurofilament M expression in various tissue lysates and preparations.

HB7849 revealed a single band of size 144kDa primarily present in brain cytosol fractions. Due to high levels of phosphorylation neurofilament M is well known to migrate at a significantly heavier weight than it’s predicted molecular weight in SDS-PAGE. Method: mouse brain and rat brain membrane (P2) and cytosol fractions were prepared following previous work (Molnar et al., 1993. Neuroscience 53:307-326) from freshly collected adult brains. Other tissue lysates were prepared following established protocols from freshly dissected tissue. Samples were loaded (20µg / lane) onto a 7.5% acrylamide gel alongside a protein ladder (BioRad Precision Plus dual colour, 1610374) before being run at 60V for 30 minutes followed by 130V for 100 minutes. Wet transfer to a PVDF membrane was completed in 90 minutes using 400mA. The membrane was blocked for 2hrs in 5% non-fat dry milk before being incubated overnight at 4°C in HB7849 at a 1:5000 dilution (0.2µg/ml). Following washing the membrane was incubated in secondary antibody (1:10,000 dilution, Polyclonal goat anti-mouse HRP conjugated, Sigma Aldrich A3682) for 2hrs. For more detail please see our Western blotting protocol. Detection was accomplished using Clarity Western ECL substrate (BioRad, 1705061) and a Licor Odyssey Fc imaging system (ECL channel: 10 min exposure, 700nm channel: 30 sec exposure). 

Figure 4. Concentration response of HB7849 staining in a rat brain cytosol preparation.

HB7849 shows consistent results with low background at dilutions as low as 1:64,000 (6.25 ng/ml). Due to high levels of phosphorylation neurofilament M is well known to migrate at a significantly heavier weight than it’s predicted molecular weight in SDS-PAGE. Method: cytosol fractions were prepared from fresh rat brains following established protocols (Molnar et al., 1993. Neuroscience 53:307-326). Rat cytosol samples were loaded (20µg / lane) onto a 7.5% acrylamide gel alongside a protein ladder (BioRad Precision Plus dual colour, 1610374) before being run at 60V for 35 minutes followed by 130V for 90 minutes. Wet transfer to a PVDF membrane was completed in 90 minutes using 400mA. Following transfer the membrane was cut into strips using Ponceau dye to visualise and cut individual lanes. Strips were blocked for 2hrs in 5% non-fat dry milk before being incubated overnight at 4°C in HB7849. Each strip was incubated separately with a separate HB7849 concentration with this ranging from 1µg/ml (1:1000 dilution) to 3.9ng/ml (1:256,000 dilution). Following washing the membrane was incubated in secondary antibody (1:10,000 dilution, Polyclonal goat anti-mouse HRP conjugated, Sigma Aldrich A3682) for 2hrs. For more detail please see our Western blotting protocol. Detection was accomplished using Clarity Western ECL substrate (BioRad, 1705061) and a Licor Odyssey Fc imaging system (ECL channel: 10 min exposure, 700nm channel: 30 sec exposure). Band intensity was calculated using Image Studio version 5.2.5 (LiCor) and a graph was constructed in GraphPad Prism 9 using a 3-parameter Hill equation curve fit.

Figure 5. Neurofilament M and GAPDH expression in various tissue lysates and preparations.

HB7849 revealed a band of size 138kDa primarily present in brain cytosol fractions. Due to high levels of phosphorylation neurofilament M is well known to migrate at a significantly heavier weight than it’s predicted molecular weight in SDS-PAGE. Method: mouse brain and rat brain membrane (P2) and cytosol fractions were prepared following previous work (Molnar et al., 1993. Neuroscience 53:307-326) from freshly collected adult brains. Other tissue lysates were prepared following established protocols from freshly dissected tissue. Samples were loaded (20µg / lane) onto a 10% acrylamide gel alongside a protein ladder (BioRad Precision Plus dual colour, 1610374) before being run at 60V for 30 minutes followed by 130V for 120 minutes. Wet transfer to a PVDF membrane was completed in 90 minutes using 400mA. The membrane was blocked for 2hrs in 5% non-fat dry milk before being incubated overnight at 4°C in HB7849 at a 1:5000 dilution (0.2µg/ml) and HB9177 at a 1:4,000 dilution (0.25 µg/ml). Following washing the membrane was incubated in secondary antibody (1:10,000 dilution, Polyclonal goat anti-mouse HRP conjugated, Sigma Aldrich A3682) for 2hrs. For more detail please see our Western blotting protocol. Detection was accomplished using Clarity Western ECL substrate (BioRad, 1705061) and a Licor Odyssey Fc imaging system (ECL channel: 10 min exposure, 700nm channel: 30 sec exposure).

Product information

Immunogen Amino acids 677 - 845 of rat neurofilament M expressed in a fusion protein in E.coli
Clone number 3H11
Isotype IgG1
Purification

Protein G affinity chromatography

Concentration 1mg/ml
Formulation 50% PBS, 50% glycerol + 5mM sodium azide
Predicted species reactivity Chicken, Cow, Human, Mouse, Pig, Rat
Tested species reactivity Mouse, Rat

Tested applications

Applications ICC, WB
Western blot optimal concentration 125ng/ml (1:8000) as assessed in rat brain cytosol preparation
ICC optimal concentration 500ng/ml (1:2000) as assessed in cultured rat neurones
Positive control

Neurofilament M is highly expressed in neural tissue and also found in HEK293 cells.

Negative control

Any tissue not of neural origin and nearly all cell lines.

Open data link

Please follow this link to OSF

Target information

Other names NF-M, NFM, NEFM, 160 kDa neurofilament protein, Neurofilament 3, Neurofilament triplet M protein
UniProt ID P07197
Structure image  Chemical Structure
Gene name NEFM
NCBI full gene name neurofilament medium chain
Entrez gene ID

4741

Amino acids 916 ( 102.4kDa)
Isoforms Neurofilament M has two isoforms: Isoform 1 (canonical): 916 amino acids, 102.4kDa; Isoform 2 (missing residues 1-376): 540aa, 59.5kDa.
Expression Expressed within neurones only throughout the body
Subcellular expression Expressed within the cytoskeleton and axons only.
Processing The leading methionine is removed to leave the mature polypeptide chain.
Post translational modifications

Phosphorylated on numerous residues leading to the large discrepancy between predicted molecular weight and the apparent weight in SDS-PAGE experiments.

Homology (compared to human) Mice and rat neurofilament M show 89.2% and 89.1% identity to the human protein respectively.
Similar proteins Similar proteins to neurofilament M include: Alpha internexin (47.7% identity), Neurofilament H (43.6% identity), Neurofilament L (53.0% identity) Vimentin (45.7% identity), GFAP (46.7% identity) and Peripherin (45.2% identity)

Storage & Handling

Storage instructions -20°C
Important This product is for RESEARCH USE ONLY and is not intended for therapeutic or diagnostic use. Not for human or veterinary use

References for Anti-Neurofilament M (NF-M) antibody ValidAbTM

References are publications that support the biological activity of the product
  • Neurofilaments and Neurofilament Proteins in Health and Disease

    Yuan A et al (2017) Cold Spring Harbor Perspectives in Biology 9(4) : a018309
  • Neurofilament subunits are integral components of synapses and modulate neurotransmission and behavior in vivo

    Yuan A et al (2015) Molecular Psychiatry 20(8) : 986-94
  • Neurofilaments at a glance

    Yuan A et al (2012 ) Journal of Cell Science 125(14) : 3257–3263
  • Neurofilament-M interacts with the D1 dopamine receptor to regulate cell surface expression and desensitization

    Kim O et al (2002 ) Journal of Neuroscience 22(14) : 5920-30

FAQs

What other neuroscience markers are available?
Why is the molecular weight of neurofilament proteins different in western blots to their predicted mass?

Neurofilament proteins are subject to heavy phosphorylation which has the effect of making the protein migrate slower than it’s mass would predict. This therefore makes the protein appear at a heavier molecular weight than predicted.

What guarantee do you have that my Neurofilament M antibody will perform as expected?

We guarantee that your Neurofilament M antibody will work for the applications and species we list on the datasheet. If the antibody fails to perform as expected then we are happy to offer a 100% refund guarantee. For more details please see our guarantee policy.

Will my Neurofilament M antibody work against species that have not been listed on the datasheet?

A species not being listed doesn’t mean that the Neurofilament M antibody won’t work, just that we haven’t tested it. If you test one of our antibodies in a new species please let us know (positive or negative)!

What protocols are available for use with this Neurofilament M antibody

We have made a comprehensive collection of protocols that we have used in our experiments to validate this Neurofilament M antibody.

What counterstains do you recommend for use in ICC and IHC with this Neurofilament M antibody antibody?

We recommend using either DAPI or Hoechst 33342 to label cell nuclei. In some experiments it is also helpful to label actin filaments in the cytoskeleton using a Phalloidin conjugate such as FITC Phalloidin or Rhodamine Phalloidin-TRITC.

Any other questions?

For any other questions about our antibody products please see our technical FAQs for antibodies