TSPAN13 Antibody

What are the primary applications for TSPAN13 antibodies in research?

Based on the search results, TSPAN13 antibodies are primarily used in the following applications:

TSPAN13 antibodies have been employed in studies investigating cancer development and progression, particularly in prostate, thyroid, breast cancers, and osteosarcoma .

How should TSPAN13 antibodies be stored and handled?

According to multiple antibody manufacturers, optimal storage conditions for TSPAN13 antibodies include:

• Store at -20°C, where they remain stable for approximately one year after shipment

• Many formulations contain PBS with 0.02% sodium azide and 50% glycerol at pH 7.3

• Some smaller volume products (20 μl) may contain 0.1% BSA

• Aliquoting is generally unnecessary for -20°C storage

When working with these antibodies, it is recommended to titrate them in each testing system to achieve optimal results, as dilution requirements can be sample-dependent .

What is the relationship between TSPAN13 expression and cancer progression?

TSPAN13 has been implicated in several cancer types with different expression patterns depending on the cancer type:

These contrasting findings suggest that TSPAN13's role may be context-dependent and tissue-specific, highlighting the importance of careful experimental design when studying this protein in different cancer types.

How does miR-369-3p regulate TSPAN13 expression and what are the functional consequences?

Research has revealed that miR-369-3p directly regulates TSPAN13 expression through binding to its 3'UTR. In thyroid cancer:

• miR-369-3p and TSPAN13 expression levels are inversely correlated in thyroid cancer tissues

• Bioinformatics analysis identified a conserved binding site between the 3'UTR of TSPAN13 and miR-369-3p

• Dual-luciferase reporter assays confirmed that miR-369-3p directly targets TSPAN13 by binding to its 3'UTR

• Overexpression of miR-369-3p downregulates TSPAN13 at both mRNA and protein levels in thyroid cancer cell lines (TPC-1 and GLAG-66)

Functional consequences of this regulation include:

These findings suggest that miR-369-3p functions as a tumor suppressor in thyroid cancer by targeting TSPAN13.

Why does TSPAN13 show a discrepancy between calculated and observed molecular weights?

TSPAN13 exhibits a notable discrepancy between its calculated molecular weight (22-24 kDa) and observed molecular weight (28-35 kDa) in Western blot analyses . This discrepancy is attributed to post-translational modifications, particularly glycosylation .

When working with TSPAN13 antibodies in Western blot applications, researchers should expect to observe bands in the 28-35 kDa range rather than at the calculated 22 kDa weight . This knowledge is critical for proper data interpretation and avoiding false negatives.

For experiments requiring precise characterization of TSPAN13 post-translational modifications, researchers might consider:

• Enzymatic deglycosylation treatments followed by Western blot

• Mass spectrometry analysis to identify specific modifications

• Comparison of TSPAN13 from different tissue sources to understand tissue-specific modification patterns

How can researchers validate the specificity of TSPAN13 antibodies?

Validating antibody specificity is critical for reliable experimental results. For TSPAN13 antibodies, consider the following validation approaches:

• Knockout/Knockdown Controls: Using TSPAN13 knockout or knockdown samples as negative controls provides the most stringent validation. Published studies have employed TSPAN13 knockdown strategies that could serve as templates for validation experiments .

• Molecular Weight Verification: Confirm that the detected band appears at the expected molecular weight range (28-35 kDa) due to post-translational modifications of the 22 kDa core protein .

• Multiple Antibody Approach: Use multiple antibodies targeting different epitopes of TSPAN13. The search results indicate available antibodies targeting various regions, including:

  • Antibodies against the internal region of TSPAN13

  • Antibodies raised against fusion proteins of TSPAN13

  • Antibodies against synthetic peptides within TSPAN13

• Overexpression Systems: Use TSPAN13-overexpressing systems (such as TSPAN13-HA tagged constructs) as positive controls, similar to those described in research on Entamoeba histolytica .

What methodologies are effective for studying TSPAN13 protein interactions?

TSPAN13, as a tetraspanin, functions in organizing membrane complexes. To study its interactions:

• Co-Immunoprecipitation (Co-IP): An effective method demonstrated in studies with tagged TSPAN13 constructs. For example, TSPAN12-HA and TSPAN13-HA were used for reverse co-IP followed by mass spectrometry analysis to identify interaction partners .

• Immunoprecipitation Protocol Example:

  • Use 0.5-4.0 μg of TSPAN13 antibody for 1.0-3.0 mg of total protein lysate

  • Validate successful IP using anti-TSPAN13 immunoblotting

  • Identify co-precipitated proteins by mass spectrometry or Western blotting for suspected interactors

• Tetraspanin-Enriched Microdomains (TEMs) Isolation:

  • Use detergent resistance-based methods to isolate TEMs

  • Analyze TSPAN13 distribution using sucrose gradient centrifugation

  • This approach was effectively used to study tetraspanin roles in Entamoeba histolytica

• Proximity Labeling Techniques:

  • BioID or APEX2 fusion proteins can identify proteins in close proximity to TSPAN13

  • These techniques are particularly useful for membrane proteins like TSPAN13

What are common challenges in detecting TSPAN13 in different experimental systems?

Researchers frequently encounter several challenges when working with TSPAN13:

• Varied Expression Levels: TSPAN13 expression varies significantly across tissues and cell lines. Positive controls reported in literature include:

  • PC-3 cells for Western blot applications

  • Mouse lung tissue for Western blot and immunoprecipitation

  • Human stomach, prostate, placenta, and small intestine for IHC applications

• Specificity Issues: As with many membrane proteins, generating highly specific antibodies can be challenging. Recommended approaches include:

  • Using multiple antibodies targeting different epitopes

  • Including appropriate positive and negative controls

  • Validating results with complementary techniques

• Extraction Efficiency: Membrane proteins like TSPAN13 can be difficult to extract completely. Consider:

  • Using RIPA lysis buffer with protease inhibitors for protein extraction

  • Optimizing detergent concentrations for complete solubilization

  • Including appropriate controls to confirm extraction efficiency

• Post-translational Modifications: The discrepancy between calculated (22 kDa) and observed (28-35 kDa) molecular weights due to glycosylation can complicate data interpretation .

How can researchers optimize immunohistochemistry protocols for TSPAN13 detection?

For optimal TSPAN13 detection in tissue samples using immunohistochemistry:

• Antigen Retrieval: Heat-mediated antigen retrieval with citrate buffer pH 6 is recommended before commencing with IHC staining protocols .

• Antibody Dilution Optimization:

  • Starting dilutions of 1:50 have been successfully used

  • Some protocols recommend 10 μg/ml concentration

  • Titration is recommended for each specific tissue type

• Positive Control Tissues: The following human tissues have been successfully used for TSPAN13 IHC:

  • Stomach tissue

  • Prostate tissue

  • Placenta

  • Small intestine

• Visualization Systems: Both DAB and fluorescent secondary antibodies have been successfully used for TSPAN13 detection, allowing flexibility based on research needs .

How is TSPAN13 involved in cellular signaling and what techniques are useful for studying these pathways?

TSPAN13, like other tetraspanins, functions as an organizer of membrane complexes and plays key roles in diverse signal transduction events . To study TSPAN13's involvement in signaling:

• Pathway Analysis After TSPAN13 Manipulation:

  • Analyze key pathway components (e.g., proliferation, apoptosis) after TSPAN13 knockdown

  • Overexpression studies can complement knockdown approaches

  • Look for changes in phosphorylation status of downstream effectors

• Interaction with Signaling Receptors:

  • Co-immunoprecipitation can identify associated receptors

  • Proximity labeling techniques can reveal signaling complexes

  • FRET/BRET approaches can determine direct interactions

• Tetraspanin-Enriched Microdomains (TEMs):

  • TEMs play an important role in creating signaling platforms

  • Techniques to isolate and analyze TEMs can provide insights into TSPAN13 signaling roles

Existing research has shown that TSPAN13 is involved in:

• Regulation of cell proliferation pathways (relevant in multiple cancer types)

• Modulation of apoptotic signaling (demonstrated in thyroid cancer and osteosarcoma models)

• Cell-cell interactions and cellular motility (critical for cancer progression)

What are promising research directions for understanding TSPAN13's role in disease progression?

Based on current knowledge, several promising research directions emerge:

• Cancer Type-Specific Functions: Investigating why TSPAN13 appears to have opposing roles in different cancer types:

  • Tumor-promoting in prostate and thyroid cancers

  • Potentially tumor-suppressive in aggressive breast cancers

• miRNA Regulation Networks: Expanding on the miR-369-3p findings to identify:

  • Additional miRNAs regulating TSPAN13 in different contexts

  • Downstream effects of TSPAN13 regulation

  • Potential therapeutic applications of miRNA-mediated TSPAN13 regulation

• TSPAN13 in Parasite Research: Recent findings demonstrate TSPAN13's role in Entamoeba histolytica, suggesting unexplored functions in host-pathogen interactions .

• Post-translational Modification Analysis: Comprehensive characterization of:

  • Glycosylation patterns across tissues and disease states

  • Impact of modifications on TSPAN13 function

  • Enzymes responsible for TSPAN13 modifications

• TSPAN13 as a Biomarker: Evaluating TSPAN13's potential as a:

  • Diagnostic biomarker for cancer type and stage

  • Prognostic indicator for patient outcomes

  • Predictive biomarker for treatment response

These directions highlight the multifaceted nature of TSPAN13 biology and its growing importance in diverse research fields.