SLC25A4 Antibody

What is SLC25A4 and why is it important to study?

SLC25A4 (solute carrier family 25 member 4) is a mitochondrial carrier protein that functions as an ADP:ATP antiporter. It mediates the import of ADP into the mitochondrial matrix for ATP synthesis and exports ATP to fuel cellular processes . The canonical human protein is 298 amino acids with a molecular weight of 33.1 kDa . SLC25A4 is associated with several diseases, including progressive external ophthalmoplegia with mitochondrial DNA deletions and familial hypertrophic cardiomyopathy . Recent research has also identified SLC25A4 as a key molecule in osteosarcoma (OS) development, where its downregulation is associated with poor prognosis .

What are the recommended applications for SLC25A4 antibodies?

Based on available research antibodies, SLC25A4 antibodies have been validated for multiple applications:

Western Blot is the most widely used application, with over 60 citations in the literature describing the use of SLC25A4 antibodies in research .

How should I optimize sample preparation for detecting SLC25A4 in Western Blot?

For optimal detection of SLC25A4 in Western Blot:

• Use fresh tissue samples with high mitochondrial content (heart, skeletal muscle, or brain tissue) as SLC25A4 is highly expressed in these tissues .

• Employ mitochondrial isolation protocols when working with cells or tissues with lower expression levels to concentrate the target protein.

• Include protease inhibitors in your lysis buffer to prevent degradation of this mitochondrial membrane protein.

• Heat samples at 70°C instead of boiling to prevent aggregation of this membrane protein.

• Use reducing conditions (with β-mercaptoethanol or DTT) for optimal denaturation.

The expected molecular weight for SLC25A4 is approximately 33 kDa , and researchers should be cautious about potential cross-reactivity with other ANT isoforms.

How can I distinguish between SLC25A4 (ANT1) and other ANT isoforms in my experiments?

Distinguishing between different ANT isoforms represents a significant challenge in research due to high sequence homology. Consider these approaches:

• Select antibodies that specifically target unique epitopes of SLC25A4. For example, antibodies targeting the 40-52 amino acid region of human SLC25A4 have been reported to be specific .

• Validate antibody specificity using positive and negative controls:

  • Use tissues with known differential expression: SLC25A4 (ANT1) is highly expressed in heart and skeletal muscle, while SLC25A5 (ANT2) is predominantly expressed in proliferating cells .

  • Include knockout/knockdown models when possible.

• Be aware that some commercial antibodies recognize both ANT1 and ANT2, as indicated in product documentation . The antibody from Proteintech (30631-1-AP) specifically notes reactivity with both isoforms.

• Consider complementary approaches such as mRNA analysis (RT-qPCR) to confirm protein expression data.

What are the optimal conditions for immunofluorescence detection of SLC25A4 in mitochondria?

For high-quality immunofluorescence imaging of SLC25A4:

• Fixation and permeabilization:

  • Use 4% paraformaldehyde (10-15 minutes) for fixation

  • For mitochondrial proteins, permeabilization with 0.2% Triton X-100 is often effective

• Antibody dilution: Typically 1:200-1:800 for primary antibodies, depending on the specific product .

• Co-localization studies:

  • Co-stain with established mitochondrial markers (e.g., TOM20, Mitotracker)

  • Use confocal microscopy for precise localization

• Signal verification:

  • Include SLC25A4 knockdown controls to verify signal specificity

  • The subcellular localization of SLC25A4 has been confirmed in the mitochondria using the Human Protein Atlas database .

How do I interpret conflicting results between different SLC25A4 antibodies?

When facing contradictory results:

• Compare epitope information: Different antibodies target different regions of SLC25A4, which may affect accessibility depending on protein conformation or interaction partners.

• Evaluate antibody validation data:

  • Review Western blot validation images provided by manufacturers

  • Check if knockdown/knockout validation has been performed

• Consider post-translational modifications or splice variants that might affect epitope recognition.

• Test multiple antibodies in parallel using the same experimental conditions.

• Validate with orthogonal methods: complement antibody-based detection with mRNA analysis or mass spectrometry.

How can I use SLC25A4 antibodies to study its role in mitochondrial diseases?

SLC25A4 has been associated with progressive external ophthalmoplegia with mitochondrial DNA deletions (PEO) and other mitochondrial disorders . To investigate its role:

• Compare expression levels between patient and control samples using Western blot with appropriate normalization controls.

• Use immunohistochemistry to examine tissue-specific expression patterns in disease models.

• Combine with functional assays:

  • Measure ATP/ADP transport activity in isolated mitochondria

  • Assess mitochondrial membrane potential

  • Evaluate mitochondrial permeability transition, as SLC25A4 facilitates this process

• Consider the role of SLC25A4 in mitophagy, as it has been shown to be required for this process .

What is the current understanding of SLC25A4's role in cancer, and how can I study it?

Recent research has identified SLC25A4 as a key molecule in cancer development:

• Expression analysis: SLC25A4 was found to be significantly downregulated in osteosarcoma patients, which was associated with poor prognosis . Pan-cancer analysis indicated decreased expression in most tumor types .

• Functional studies:

  • SLC25A4 knockdown significantly accelerated OS cell proliferation, migration, and invasion while inhibiting apoptosis

  • Conversely, SLC25A4 overexpression inhibited proliferation, migration, and invasion while promoting apoptosis

• Mechanistic investigations:

  • Gene Set Enrichment Analysis (GSEA) showed that high SLC25A4 expression may mediate inflammation, apoptosis, and immune-related pathways (Oxidative Phosphorylation, TNFα Signaling Via NFκB, IL6/JAK2/STAT3 Signaling)

  • Low SLC25A4 expression was enriched in the G2M checkpoint, suggesting association with cell proliferation

To study SLC25A4 in cancer:

• Use siRNA knockdown or overexpression approaches as demonstrated in published studies

• Employ functional assays (CCK-8, EdU, wound healing, Transwell) to assess effects on cancer cell behavior

• Complement with flow cytometry to evaluate apoptosis rates

Why might I be getting weak or no signal when detecting SLC25A4 in Western blot?

Several factors may contribute to weak SLC25A4 detection:

• Low expression levels: SLC25A4 shows tissue-specific expression patterns. Use positive control tissues like heart or skeletal muscle .

• Protein degradation: Mitochondrial proteins are sensitive to degradation. Use fresh samples and include protease inhibitors.

• Inefficient extraction: As a mitochondrial membrane protein, SLC25A4 may require specialized extraction buffers containing appropriate detergents (RIPA or NP-40 with 0.1-0.5% SDS).

• Antibody dilution: Recommended dilutions for Western blot range from 1:500 to 1:3000 . Optimize by testing a dilution series.

• Blocking conditions: Try different blocking agents (5% milk, 3-5% BSA) to improve signal-to-noise ratio.

• Detection system: Consider using enhanced chemiluminescence (ECL) or fluorescent secondary antibodies for improved sensitivity.

What controls should I include when using SLC25A4 antibodies?

For rigorous experimental design:

• Positive tissue controls:

  • Human/mouse heart tissue lysate

  • Human/mouse skeletal muscle tissue

  • C2C12 cells (mouse myoblast cell line)

• Negative controls:

  • Tissues with low SLC25A4 expression

  • SLC25A4 knockdown samples

  • No primary antibody control

• Loading controls:

  • For mitochondrial proteins: VDAC, COX IV, or citrate synthase

  • For whole cell lysates: standard loading controls (β-actin, GAPDH) may be used but are less ideal for mitochondrial proteins

• Specificity controls:

  • Pre-absorption of antibody with immunizing peptide (if available)

  • Alternative antibodies targeting different epitopes

How can I use SLC25A4 antibodies to study mitochondrial dynamics and function?

To investigate SLC25A4's role in mitochondrial function:

• Co-immunoprecipitation studies:

  • Use to identify interaction partners of SLC25A4

  • Recommended dilution for IP: approximately 1:50

  • Employ crosslinking approaches for transient interactions

• Super-resolution microscopy:

  • Combine with other mitochondrial markers to study localization within mitochondrial compartments

  • Investigate spatial relationships with components of the mitochondrial permeability transition pore

• Proximity labeling techniques:

  • BioID or APEX2 fusions to map the proximal interactome of SLC25A4

  • Can reveal both stable and transient protein interactions

• Functional correlation:

  • Combine immunofluorescence with membrane potential indicators to correlate SLC25A4 expression with mitochondrial function

  • Investigate relationship with pyroptosis, as SLC25A4 facilitates mitochondrial permeability transition induced by bile acids

What genetic alterations of SLC25A4 have been identified, and how can I study their effects?

Genetic studies have revealed important insights about SLC25A4 mutations:

To study the effects of these genetic alterations:

• Use site-directed mutagenesis to introduce specific mutations

• Assess functional consequences through ATP/ADP transport assays

• Evaluate effects on protein stability, localization, and interaction partners

• Consider patient-derived samples or CRISPR-engineered cell lines harboring specific mutations