beta III Tubulin Mouse mAb: Selection & Application Guide

beta III Tubulin Mouse mAb is a neuron-specific monoclonal antibody raised in mouse that selectively recognizes the beta III tubulin (TUBB3) isotype, enabling reliable identification and characterization of neuronal populations across a broad range of experimental applications.

Product SKU

Ab348599

Antibody Type

Mouse Monoclonal Antibody (mAb)

Target Antigen

beta III Tubulin (TUBB3), a neuron-specific microtubule protein

Primary Applications

Immunofluorescence (IF), Immunohistochemistry (IHC), Western Blot (WB)

Specificity

Neuron-specific; beta III tubulin is predominantly expressed in neurons and is absent or low in most non-neuronal cells

Reference Clone

Derived from absea clone KC-2165

Background: Beta III Tubulin as a Neuronal Marker

Tubulins are the principal structural proteins of microtubules, which are essential cytoskeletal elements involved in cell division, intracellular transport, and the maintenance of cell morphology. The tubulin superfamily comprises multiple alpha and beta isotypes encoded by distinct genes. Among beta tubulin isotypes, beta III tubulin — encoded by the TUBB3 gene — stands out for its near-exclusive expression in neurons of the central and peripheral nervous systems.

Because of this restricted expression pattern, beta III tubulin has become one of the most widely used immunohistochemical and immunofluorescence markers for neurons in both in vitro and in vivo experimental settings. It is routinely used to identify neurons derived from stem cells, to assess neuronal density and morphology in tissue sections, and to monitor axonal integrity in models of neurodegeneration or nerve injury.

Mutations in TUBB3 have been linked to congenital fibrosis of the extraocular muscles and other neurological conditions, underscoring the biological importance of this isotype beyond its utility as a laboratory marker.

Antibody Specifications and Validated Applications

The beta III Tubulin Mouse mAb (Ab348599) is a mouse-derived immunoglobulin raised against the TUBB3 protein. The clone reference is KC-2165 (absea). As a monoclonal antibody, it offers high reproducibility and lot-to-lot consistency, which is critical for longitudinal studies and multi-site collaborations.

Immunofluorescence (IF): This antibody is well-suited for fluorescence-based detection of neuronal cells in culture. Paired with an appropriate fluorophore-conjugated secondary anti-mouse antibody, it reliably labels neuronal soma, axons, and dendrites, enabling quantification of neuronal differentiation and network formation.

Immunohistochemistry (IHC): For paraffin-embedded or frozen tissue sections, the antibody can be used to map neuronal distribution within brain, spinal cord, and peripheral ganglia. Antigen retrieval conditions should be empirically optimized for formalin-fixed paraffin-embedded (FFPE) material.

Western Blot (WB): Beta III tubulin migrates at approximately 50 kDa on SDS-PAGE. The antibody can be used to confirm TUBB3 expression in neuronal lysates or to verify neuronal identity of differentiated cell populations.

Note: Specific dilution ranges, incubation conditions, and validated species reactivity should be confirmed in the product datasheet or by contacting Aladdin Scientific technical support, as these parameters are subject to ongoing validation.

Recommended Protocol Overview

The following represents a general-purpose starting protocol. Researchers should optimize each step for their specific sample type and detection system.

Immunofluorescence (Cultured Cells)

1. Fix cells with 4% paraformaldehyde in PBS for 15 minutes at room temperature.
2. Wash three times with PBS (5 minutes each).
3. Permeabilize with 0.1–0.3% Triton X-100 in PBS for 10 minutes.
4. Block with 5–10% normal serum (from the same species as the secondary antibody) in PBS with 0.1% Tween-20 (PBST) for 1 hour at room temperature.
5. Incubate with beta III Tubulin Mouse mAb (Ab348599) diluted in blocking buffer overnight at 4°C. Empirically determine optimal working dilution.
6. Wash three times with PBST.
7. Apply fluorophore-conjugated anti-mouse secondary antibody for 1 hour at room temperature, protected from light.
8. Wash, counterstain nuclei with DAPI if desired, and mount coverslips.
9. Image using appropriate fluorescence microscopy.

Western Blot

1. Prepare cell or tissue lysate in RIPA buffer supplemented with protease inhibitors.
2. Determine protein concentration and load equal amounts (typically 20–40 µg) per lane on SDS-PAGE.
3. Transfer to PVDF or nitrocellulose membrane.
4. Block membrane with 5% non-fat milk or BSA in TBST for 1 hour.
5. Incubate with primary antibody diluted in blocking buffer; optimize concentration empirically.
6. Wash and incubate with HRP-conjugated anti-mouse secondary antibody.
7. Detect by enhanced chemiluminescence (ECL). Expect a band near 50 kDa.

Troubleshooting Common Issues

Even with optimized reagents, immunodetection experiments can encounter reproducibility challenges. The table below summarizes the most frequent issues and their likely causes and remedies.

Issue	Likely Cause	Suggested Remedy
No signal in IF or IHC	Insufficient antigen retrieval (FFPE); antibody too dilute; incompatible fixation	Optimize antigen retrieval (heat-induced, citrate pH 6 or EDTA pH 9); titrate antibody; avoid methanol fixation for cytoskeletal targets
High background	Inadequate blocking; secondary antibody cross-reactivity; too high primary antibody concentration	Extend blocking time; use species-matched negative controls; reduce primary antibody concentration
Non-specific bands on WB	Overloading; insufficient washing; cross-reactive secondary antibody	Reduce protein load; increase wash stringency with higher Tween-20; verify secondary antibody specificity
Weak WB signal	Protein degradation; low TUBB3 expression in sample; transfer inefficiency	Add protease inhibitors during lysis; use positive control neuronal lysate; verify transfer with Ponceau S staining

Storage, Handling, and Quality Assurance

Storage: Upon receipt, briefly centrifuge the vial and store according to the conditions specified on the product datasheet. Monoclonal antibodies are typically stored at –20°C for long-term storage. Avoid repeated freeze-thaw cycles, which can reduce antibody activity and cause aggregation. If aliquoting is required, perform this step upon first thaw.

Handling: Work on ice when setting up antibody dilutions. Keep antibody solutions protected from direct light, particularly when working with fluorophore-conjugated preparations. Use low-protein-binding tubes to minimize adsorptive losses.

Quality Control: Each lot of Ab348599 undergoes internal quality control testing. Researchers are encouraged to include appropriate positive and negative controls in every experiment: neuronal cell lines (e.g., SH-SY5Y differentiated neurons) or brain tissue sections serve as robust positive controls, while non-neuronal cell types (e.g., HeLa, 3T3) serve as negative controls.

Regulatory Status: This product is intended for research use only (RUO) and is not approved for diagnostic or therapeutic applications in humans or animals.

Frequently asked questions

What makes beta III tubulin a reliable neuron-specific marker?

Beta III tubulin (TUBB3) is encoded by a gene whose expression is tightly regulated and predominantly restricted to neurons of the central and peripheral nervous systems. Unlike other tubulin isotypes that are broadly expressed across cell types, TUBB3 is largely absent from glial cells, epithelial cells, and most non-neuronal tissues, making it a highly selective marker for neurons in mixed-cell-population experiments.

Which secondary antibody should I use with beta III Tubulin Mouse mAb (Ab348599)?

Because Ab348599 is a mouse monoclonal antibody, you should select an anti-mouse secondary antibody raised in a species other than mouse (commonly goat or donkey). For immunofluorescence, choose a fluorophore-conjugated anti-mouse IgG appropriate for your microscope's filter sets. For western blot, use an HRP-conjugated anti-mouse IgG secondary antibody. If your experiment also involves a rabbit primary antibody, ensure the two secondaries are spectrally or biochemically distinguishable to avoid cross-detection.

Can this antibody be used to detect beta III tubulin in non-human species?

The validated species reactivity for Ab348599 should be confirmed in the current product datasheet, as cross-reactivity with rodent (mouse, rat) and other mammalian samples depends on epitope conservation between species. Researchers working with non-human samples are strongly advised to perform a pilot experiment with appropriate controls to empirically confirm reactivity before committing to a full study.

How should I validate that the antibody is performing correctly in my hands?

Include a neuronal positive control (e.g., differentiated SH-SY5Y cells, primary cortical neurons, or brain tissue section) and a non-neuronal negative control (e.g., HeLa or NIH 3T3 cells) in your first experiment. In western blot, confirm the expected band at approximately 50 kDa. In IF or IHC, confirm cytoplasmic and neuritic staining pattern restricted to neuronal cells. A primary antibody omission control (no primary antibody, secondary only) is also essential to assess background.

References

1. Jiang Y-W, et al. TUBB3 mutations cause a broad spectrum of axonal neuropathies with brain malformations. Annals of Neurology. 2014. [Review flag: specific volume, page, and author details need primary source verification]
2. Tubulin isotype biology reference: Janke C. The tubulin code: Molecular components, readout mechanisms, and functions. Journal of Cell Biology. 2014;206(4):461-472. [Review flag: confirm this citation matches actual publication details]
3. Absea Biotechnology. Product specification sheet for clone KC-2165, anti-TUBB3 monoclonal antibody. [Review flag: verify existence and current datasheet details directly with absea or Aladdin Scientific]

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.