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TRPC4 · Western blot design guide
Design a Western Blot for TRPC4
Real validated TRPC4 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-TRPC4 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
TRPC4 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 | ~112.1 kDa | |
| Observed band | ~150 kDa | |
| Gel | 8–10% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Anomalous membrane protein migration | |
| Regulation | IFN-γ-induced | |
| Isoform | 7 isoform(s) |
Section 1
Real Curated TRPC4 Western Blot Protocols
Literature-validated Western blot parameters for TRPC4 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | astrocytes (human RTT iPSC-derived and mouse Mecp2 mutant) |
| Gel % | 8–10% |
| Transfer | semi-dry transfer system (BioRad) onto nitrocellulose membrane |
| Membrane | nitrocellulose (Whatman) |
| Blocking | 5% milk solution for 1 hr |
| Primary antibody | 1:100 |
| Primary incubation | 4°C overnight |
| Secondary antibody | 1:10,000 |
| Secondary incubation | 1 hr at room temperature |
| Detection | infrared dye-conjugated secondary antibody |
| Exposure / imaging | Odyssey infrared imaging system |
Section 2
What Is the Expected TRPC4 Western Blot Band Size?
TRPC4 has a 112 kDa predicted backbone but typically runs at ~150 kDa on Western blots due to anomalous migration of this multi-pass membrane channel protein.
| Single band around 150 kDa in whole-cell lysate | the mature, membrane-embedded TRPC4 channel migrating well above its 112 kDa predicted mass |
| Band position varies slightly (roughly 110-150 kDa) across cell lines or tissues | reflects which of the seven alternatively spliced TRPC4 isoforms (Alpha, Beta, Delta, Gamma, Epsilon, Zeta, Eta) are expressed |
| No shift to a doubled-size band under non-reducing conditions | the single disulfide (Cys549-Cys554) is a short intrachain loop, not an inter-chain linkage, so it does not generate a dimer-sized species |
| Faint higher-molecular-weight smear above the main ~150 kDa band | residual homotetrameric or TRPC1/TRPC5 heterotetrameric channel assemblies that were not fully dissociated by SDS |
| Band still detected in whole-cell lysate rather than absent | TRPC4 is a cell-membrane multi-pass channel, not a secreted protein, so it is retained when lysates are prepared with adequate detergent |
💡Expected TRPC4 appearanceExpect a single dominant band at approximately 150 kDa in whole-cell lysate, well above the 112 kDa predicted mass, due to anomalous SDS-PAGE migration typical of this multi-pass membrane channel protein.
| Predicted mass from UniProt (112.1 kDa) | sets the theoretical backbone size before any migration or assembly effects are applied |
| Multi-pass transmembrane channel structure | causes anomalous, slower migration on SDS-PAGE so the protein typically runs near 150 kDa instead of its calculated mass |
| Homotetramer/heterotetramer assembly with TRPC1 and/or TRPC5 | incomplete denaturation of this non-covalent oligomer can leave a faint higher-molecular-weight species above the main band |
| Intrachain disulfide bond (Cys549-Cys554) | stabilizes a short loop and can subtly change mobility under non-reducing conditions, but does not create an inter-chain or dimer-sized band |
| Seven named splice isoforms (Alpha, Beta, Delta, Gamma, Epsilon, Zeta, Eta) | can produce additional bands at slightly different apparent sizes depending on which isoforms a sample expresses |
| C-terminal phosphotyrosine sites (Tyr959, Tyr972; FYN) | phosphorylation can add a minor upward mobility shift but is a secondary contributor compared to the transmembrane-driven shift |
| Situation | Likely cause | Next action |
|---|---|---|
| Band higher than expected | multi-pass transmembrane channel proteins migrate anomalously and TRPC4 tetramers may not fully dissociate under standard SDS conditions | compare against the known ~150 kDa apparent size, ensure samples are fully reduced and denatured, and resolve on a lower-percentage gel if needed |
| Multiple bands | co-expression of several TRPC4 splice isoforms or partially denatured oligomeric channel complexes | confirm the specific band with an isoform-aware or validated antibody and a knockdown/knockout control |
| No band in lysate | incomplete solubilization of this multi-pass membrane protein with a lysis buffer lacking sufficient detergent | use a membrane-compatible lysis buffer (e.g., RIPA or NP-40 based) and avoid under-extracting the membrane fraction |
| Weak or no signal | low native TRPC4 expression in the sampled cell type or degradation during lysate preparation | increase protein loading, enrich membrane fractions, and add protease inhibitors during lysis |
| Broad smear instead of sharp band | heterogeneous phosphorylation states or variably denatured oligomeric channel assemblies | ensure fresh lysate, avoid repeated freeze-thaw, and optimize reducing agent and heating conditions |
Experiment evidence
Western blot images showing TRPC4 band
PA2307 · TRPC4
A02037-1 · TRPC4
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for TRPC4 Western blot
🧪For positive controls for TRPC4 in Western blot, you can use lysate from HEK293 cells transiently overexpressing recombinant TRPC4, since no endogenous positive tissue is defined in the current HPA dataset for this protein.
Positive control: TRPC4-overexpressing HEK293 cells
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH and β-actin antibody controls alongside a total-protein stain (e.g., stain-free gel, Ponceau S, or REVERT) to confirm equal loading.
⚠️Feasibility: As a multi-pass cell-membrane protein with no HPA expression data available, TRPC4 detection may be weak in standard whole-cell lysates, so membrane-enriched fractionation and an overexpression or knockdown/KO system are recommended to validate antibody specificity.
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 |
|---|
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|
Section 3
Advanced TRPC4 Western Blot Tips
Deeper troubleshooting and optimisation questions for TRPC4, answered from its protein features.
Why does TRPC4 run at ~150 kDa instead of 112 kDa?
TRPC4's predicted mass is 112 kDa, but as a multi-pass membrane protein it retains residual structure in SDS-PAGE, migrating anomalously higher (~150 kDa observed). Its two modified residues and one disulfide bond can further alter migration. This shift is typical for polytopic channel proteins and does not indicate a distinct proteoform.
Will I see multiple TRPC4 bands from splice isoforms?
UniProt lists 7 TRPC4 isoforms (Alpha, Beta, Delta, Gamma, Epsilon, Zeta, Eta) generated by alternative splicing. Depending on tissue and antibody epitope, you may detect one or several bands near 150 kDa or smaller truncated variants. If a single clean band is required, choose an antibody targeting a region common to your isoform of interest, or validate with isoform-specific controls.
Does EGF receptor activation change TRPC4 membrane levels?
UniProt notes TRPC4 shows enhanced insertion into the cell membrane after EGF receptor activation. Comparing membrane-fraction or surface-biotinylation lysates from EGF-stimulated versus untreated cells can reveal increased plasma-membrane TRPC4 signal without a change in total protein, so pair whole-cell lysate blots with a membrane-enrichment step to see this induction.
What blocking buffer works best for TRPC4 detection?
TRPC4 is annotated as a phosphoprotein with two modified residues, so avoid milk-based blocking buffers, as casein phosphoproteins can cross-react with phospho-specific detection reagents. Use BSA (3-5%) in TBST instead, especially if probing with phospho-TRPC4 antibodies or downstream phospho-tag detection systems.
What transfer method to use for TRPC4 Western blot?
TRPC4 is a large (112 kDa predicted, ~150 kDa observed) multi-pass membrane protein, so standard rapid transfer often under-transfers it. Use wet/tank transfer with reduced methanol (10%) or overnight transfer at low voltage and 4°C to improve efficient elution of this hydrophobic, multi-transmembrane channel protein from the gel to the membrane.
Should I reduce samples before quantifying TRPC4 by Western blot?
TRPC4 has one annotated disulfide bond and assembles as a homotetramer or heterotetramer with TRPC1/TRPC5. Always reduce samples with DTT or beta-mercaptoethanol and boil before loading, so the disulfide is broken and oligomeric complexes dissociate into the monomeric ~150 kDa band, giving an accurate single-species signal for quantitation.
What causes extra bands above the main TRPC4 band?
Because TRPC4 forms homo- and heterotetrameric channels with TRPC1/TRPC5, incompletely denatured or non-reduced samples can leave higher-molecular-weight oligomeric complexes on the blot. Ensure thorough boiling and reducing conditions to break the disulfide bond. Lower-molecular-weight bands may instead reflect one of TRPC4's 7 alternatively spliced isoforms rather than degradation.
Boster reagents
Best TRPC4 Western Blot Antibodies
BosterBio's TRPC4 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-TRPC4 Antibody Picoband®
Cat # PA2307
Real WB data
Anti-TRPC4 Antibody Picoband®
Cat # A02037-1
These Boster anti-TRPC4 antibodies are top-performing, widely cited reagents validated by orthogonal methods including negative-tissue controls and complementary techniques, giving reliable, reproducible Western blot detection of TRPC4 you can trust for publication-quality results.
Which to pick: Both PA2307 and A02037-1 include real WB validation images. PA2307 shows detection across COLO320, MCF-7, and PANC lysates; A02037-1 demonstrates standard SDS-PAGE-based WB analysis. Either is a solid choice—pick PA2307 for broader cell-line coverage or A02037-1 if it matches your workflow.
Source: BosterBio TRPC4 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q9UBN4.
- Human Protein Atlas. TRPC4 tissue expression.