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NTF3 · Western blot design guide
Design a Western Blot for NTF3
Real validated NTF3 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-NTF3 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
NTF3 Western Blot Experimental Design Guide
Expected bands, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before running
| Expected band | ~29.4 kDa | |
| Observed band | ~34 kDa | |
| Gel | 12–15% | |
| Positive control | Adipose tissue+4 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated + Cleaved | |
| Caveat | Glycosylation adds mass | |
| Regulation | Kras signaling dn | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated NTF3 Western Blot Protocols
Literature-validated Western blot parameters for NTF3 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | cervical cancer cells (C33A, CaSki, HcerEpic) and LV-NTF3/LV-ctrl transfected Caski/C33A cells |
| Membrane | PVDF |
| Blocking | QuickBlock Western Blot Blocking Buffer (Beyotime) |
| Primary antibody | 1:5,000 (Novus, NBP1-47892) |
| Primary incubation | 4 °C overnight |
| Secondary antibody | 1:10,000 |
| Secondary incubation | 1 h at room temperature |
| Wash | TBST |
| Detection | SuperFemto ECL Chemiluminescence Kit (Vazyme, E423) |
Section 2
What Is the Expected NTF3 Western Blot Band Size?
NTF3 has a 29.4 kDa predicted backbone but runs at ~34 kDa on blots due to N-glycosylation at Asn131 and cleavage of its signal peptide/propeptide during secretion.
| single band around 34 kDa | represents the mature, N-glycosylated secreted form of NTF3, running above the 29.4 kDa predicted backbone due to the N131 glycan |
| no band near the ~29 kDa full-length precursor | the 18-residue signal peptide and the propeptide (residues 19-138) are cleaved during maturation/secretion, so only the smaller mature domain is detected |
| faint or absent band in whole-cell lysate | NTF3 is a secreted protein, so most immunoreactive material is released into conditioned medium rather than retained intracellularly |
| two bands at slightly different apparent masses | corresponds to the two annotated NTF3 isoforms produced by alternative splicing |
| band mobility shifts or becomes diffuse with incomplete reduction | the three intrachain disulfide bonds stabilize the mature domain's compact fold, so under-reduced samples can migrate differently than fully reduced/denatured ones |
💡Expected NTF3 appearanceNTF3 typically runs as a single band at approximately 34 kDa in secreted/conditioned-medium samples, reflecting the mature, N-glycosylated, propeptide-cleaved form above its 29.4 kDa predicted mass.
| Predicted mass (UniProt) | 29.4 kDa backbone for the full 257-residue precursor before any modification |
| N-glycosylation at Asn131 | adds mass and can broaden the mature band above the unmodified predicted size, consistent with the observed ~34 kDa band |
| Signal peptide and propeptide cleavage (residues 1-138) | removes the N-terminal signal sequence and propeptide during secretion, giving a smaller mature band than the uncleaved full-length precursor |
| Secreted subcellular localization | shifts most detectable protein into conditioned medium/extracellular fractions, reducing or eliminating signal in standard whole-cell lysates |
| Alternative splicing (isoforms 1 and 2) | can produce two bands of differing apparent size on the same blot |
| Intrachain disulfide bonds (152-217, 195-246, 205-248) | stabilize the mature domain's folded structure, so incomplete reduction can alter apparent mobility compared with fully reduced samples |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | NTF3 is secreted and does not accumulate intracellularly in appreciable amounts | probe conditioned medium or a concentrated secreted fraction instead of whole-cell lysate |
| Band higher than expected | N-glycosylation at Asn131 adds mass above the 29.4 kDa predicted backbone | treat the sample with PNGase F and confirm the band shifts toward the predicted mass |
| Multiple bands | the two annotated splice isoforms migrate at different apparent masses | confirm isoform identity using isoform-specific antibodies or transcript context |
| Broad smear instead of sharp band | heterogeneous glycosylation at the single N-glycosylation site produces glycoform microheterogeneity | treat with PNGase F or run a higher-resolution gradient gel to sharpen the band |
| Fragments below expected size | normal proteolytic removal of the signal peptide and propeptide (residues 1-138) during maturation | check whether the antibody epitope lies within the mature domain before treating this as degradation |
| Weak or no signal | NTF3 is a low-abundance secreted growth factor diluted across a large lysate or medium volume | concentrate conditioned medium, e.g. by TCA precipitation, before loading |
Experiment evidence
Western blot images showing NTF3 band
PA1062 · NTF3
A03348-2 · NTF3
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for NTF3 Western blot
🧪For positive controls for NTF3 in Western blot, you can use recombinant NTF3 protein or an NTF3-overexpressing cell lysate, since none of the HPA-profiled tissues show detectable endogenous expression.
Positive control: Recombinant NTF3 protein / NTF3-overexpressing lysate
Negative control: Adipose tissue
Loading controls: Alongside NTF3, blot for GAPDH and β-actin and include a total-protein stain (stain-free, Ponceau, or REVERT) as loading controls.
⚠️Feasibility: NTF3 is a secreted, low-abundance neurotrophin with no detectable expression in the profiled HPA tissues, so whole-cell lysates give weak signal — favor conditioned medium or an overexpression/recombinant-protein positive control alongside a confirmed not-detected tissue as the negative.
HPA tissue expression evidence for NTF3
Comprehensive Human Protein Atlas IHC scoring per tissue. Rows are taken directly from the HPA tissue chart — click any row's HPA link to view the source.
Positive expression · recommended positive controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | adipocytes | Not detected | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | adipocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced NTF3 Western Blot Tips
Deeper troubleshooting and optimisation questions for NTF3, answered from its protein features.
Why does NTF3 run near 34 kDa instead of 29.4 kDa?
NTF3 carries one N-glycosylation site and three disulfide bonds; N-glycan addition alone can add several kDa, and disulfide-stabilized folding often causes anomalous SDS-PAGE migration relative to the unmodified 29.4 kDa prediction, so a ~34 kDa apparent band is expected even under reducing, denaturing conditions.
Could unexpected bands represent uncleaved pro-NTF3?
NTF3 is synthesized with an 18-residue signal peptide and a propeptide (residues 19-138) removed at a dibasic cleavage site. Antibodies raised against the propeptide will only detect the unprocessed precursor, producing a higher-molecular-weight band than mature secreted NTF3; check the immunogen region if extra bands appear.
Do the two NTF3 isoforms produce separate bands?
UniProt lists two annotated NTF3 isoforms from alternative splicing. These can differ slightly in length, so closely spaced bands are possible on high-resolution gels. Confirm identity with an isoform-specific antibody or by comparing observed molecular weight against each isoform's predicted sequence length rather than assuming a single band.
How can glycosylation on NTF3 be confirmed?
NTF3 has one annotated N-glycosylation site. Treat lysate with PNGase F before SDS-PAGE; loss of the glycan should shift the band closer to the 29.4 kDa unmodified prediction. If the shift persists, additional mass likely comes from residual propeptide or disulfide-dependent folding rather than glycosylation alone.
How to optimise blocking for NTF3 detection?
Because NTF3 is a secreted glycoprotein, avoid milk-based blockers, which contain glycoproteins that can cross-react with lectin-like or glyco-sensitive antibodies; use BSA-based blocking buffer instead. Given low endogenous abundance in many cell lysates, extend blocking and primary antibody incubation to reduce background without masking a faint specific band.
What transfer method to use for NTF3 Western blot?
NTF3's small predicted mass (29.4 kDa) favors low-percentage or gradient gels with a short wet transfer to prevent blot-through onto 0.2 micrometer PVDF; the propeptide-containing and mature glycosylated forms differ enough in size that adequate resolution and complete transfer of the smaller mature fragment should be confirmed.
How should secreted NTF3 be quantified accurately?
Since NTF3 is secreted, sampling conditioned media or concentrated supernatant may be more relevant than whole-cell lysate, and housekeeping proteins are unsuitable loading controls for secreted fractions; use total protein stain normalization and account for the two isoforms and glycosylated fraction when comparing band intensities across samples.
Boster reagents
Best NTF3 Western Blot Antibodies
BosterBio's NTF3 antibodies are among the best-performing WB antibodies on the market — well cited, thoroughly validated, and orthogonally cross-validated against negative tissues and complementary methods.
Real WB data
Anti-Neurotrophin 3/NTF3 Antibody Picoband®
Cat # PA1062
Real WB data
Anti-Neurotrophin 3/NTF3 Antibody Picoband®
Cat # A03348-2
These NTF3 antibodies are top-performing reagents, widely cited in published research, and thoroughly validated for Western blot specificity, with orthogonal cross-validation across multiple tissue and cell lysates confirming reliable, reproducible detection.
Which to pick: Two validated NTF3 antibodies are listed. PA1062 shows WB bands across rat brain tissue and MCF-7/HeLa lysates, good for broad tissue screening. A03348-2 provides a dedicated NTF3 WB image with detailed SDS-PAGE conditions for protocol replication.
Source: BosterBio NTF3 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P20783.
- Human Protein Atlas. NTF3 tissue expression.