Phospho-ITGB1 (Tyr795) Antibody

What is Phospho-ITGB1 (Tyr795) and what is its biological significance?

Phospho-ITGB1 (Tyr795) refers to the phosphorylated state of tyrosine 795 on integrin beta-1 protein. Integrin beta-1 is a transmembrane receptor that mediates cell-cell and cell-matrix interactions through various heterodimeric associations with alpha integrin subunits. The phosphorylation at Tyr795 occurs within the amino acid sequence PKyEG (where y is the phosphorylated tyrosine) and plays a crucial role in regulating integrin activity, signaling, and downstream cellular responses . This phosphorylation site is located in the cytoplasmic domain of ITGB1, which is critical for interactions with intracellular signaling molecules and cytoskeletal components . Biologically, this phosphorylation event is involved in modulating focal adhesion formation, cell migration, matrix reorganization, and signal transduction pathways essential for normal cellular function and development .

What experimental applications is the Phospho-ITGB1 (Tyr795) antibody validated for?

The Phospho-ITGB1 (Tyr795) antibody has been validated primarily for Western Blot (WB) and ELISA applications across multiple commercial sources . For Western Blot applications, the recommended dilution range is typically 1:500-1:2000, while ELISA applications require higher dilutions around 1:40000 . The antibody demonstrates reactivity with human, mouse, and rat samples, making it suitable for comparative studies across these species . It is important to note that other applications such as immunohistochemistry, immunofluorescence, and flow cytometry may require additional validation as these are not explicitly mentioned in the provided specifications . When designing experiments, researchers should consider performing preliminary validation in their specific experimental system to optimize conditions.

How should Phospho-ITGB1 (Tyr795) antibody be stored and handled for optimal performance?

For optimal performance, the Phospho-ITGB1 (Tyr795) antibody should be stored at -20°C for long-term preservation (up to 1 year from the date of receipt) . Some manufacturers specify a narrower temperature range of -15°C to -25°C . The antibody is typically formulated in PBS containing 50% glycerol, 0.5% BSA, and 0.02% sodium azide, which helps maintain stability during freeze-thaw cycles . Despite this stabilizing formulation, researchers should minimize repeated freeze-thaw cycles as these can degrade antibody performance over time . For frequent use over short periods (up to one month), storage at 4°C is recommended to avoid repeated freezing and thawing . Before using the antibody, allow it to equilibrate to room temperature and gently mix by inversion rather than vortexing to prevent protein denaturation and aggregation. Always maintain aseptic technique when handling the antibody to prevent microbial contamination.

How can Phospho-ITGB1 (Tyr795) antibody be used to investigate integrin-mediated signaling pathways?

Phospho-ITGB1 (Tyr795) antibody serves as a powerful tool for dissecting integrin-mediated signaling networks through multiple approaches. Researchers can employ this antibody in time-course experiments following stimulation with extracellular matrix proteins, growth factors, or mechanical stress to monitor the temporal dynamics of ITGB1 phosphorylation at Tyr795 . When combined with other phospho-specific antibodies targeting downstream effectors like FAK, Src, or ERK, investigators can construct detailed signaling maps that reveal the sequence and interdependence of phosphorylation events . For more comprehensive analysis, the antibody can be utilized in immunoprecipitation followed by mass spectrometry to identify novel protein interactions dependent on Tyr795 phosphorylation status. Additionally, dual immunofluorescence staining with this antibody and markers for focal adhesions, such as paxillin or vinculin, can reveal spatial relationships between phosphorylated ITGB1 and adhesion complex formation . For functional studies, researchers can correlate Tyr795 phosphorylation levels with cellular behaviors like migration, invasion, or matrix remodeling to establish causal relationships between this specific phosphorylation event and integrin-dependent processes.

What are the methodological considerations for quantifying ITGB1 Tyr795 phosphorylation levels in different experimental contexts?

Quantifying ITGB1 Tyr795 phosphorylation requires careful methodological consideration across various experimental platforms. When performing Western blot analysis, researchers should include both phospho-specific and total ITGB1 antibodies on parallel blots or after membrane stripping to calculate the phosphorylation-to-total protein ratio, which normalizes for variations in total protein expression . Loading controls such as GAPDH or β-actin are essential, but may not account for compartmentalization differences; therefore, subcellular fractionation prior to analysis can provide more precise localization data . For ELISA-based quantification, standard curves must be generated using known concentrations of phosphorylated peptides to ensure measurements fall within the linear range of detection . When comparing phosphorylation levels across different cell types or tissues, it is crucial to validate antibody specificity in each system, potentially using phosphatase treatment as a negative control or stimulation with agents known to induce Tyr795 phosphorylation as positive controls . For accurate temporal studies, rapid sample processing with phosphatase inhibitors is critical to prevent artificial dephosphorylation during preparation . Additionally, researchers should consider the effects of cell density, matrix composition, and serum factors on basal phosphorylation levels when designing experiments, as these variables can significantly influence integrin activation states and subsequent phosphorylation events.

How does ITGB1 Tyr795 phosphorylation relate to other post-translational modifications on integrin beta-1?

ITGB1 undergoes multiple post-translational modifications that work in concert to regulate its function and localization. Tyr795 phosphorylation exists within a complex regulatory network alongside other modification sites, including additional phosphorylation sites (like Ser785 and Thr788/789), glycosylation patterns, and ubiquitination events . Research suggests a hierarchical relationship between these modifications, where phosphorylation at one site may influence modification at other sites through conformational changes or recruitment of specific enzymes . For instance, Tyr795 phosphorylation may alter the accessibility of nearby serine/threonine residues to their respective kinases or phosphatases, creating modification cascades that fine-tune integrin signaling . To investigate these relationships, researchers can employ mass spectrometry approaches that identify multiple modifications simultaneously on the same protein molecule, revealing potential cross-talk . Additionally, site-directed mutagenesis studies comparing single versus multiple modification site mutants can elucidate the functional hierarchy and interdependence of these sites. The temporal dynamics of different modifications following integrin engagement with extracellular matrix components provide further insights into the sequential regulation of integrin activation and signaling . Understanding the interplay between Tyr795 phosphorylation and other post-translational modifications is essential for developing a comprehensive model of integrin regulation in both normal and pathological contexts.

What is the optimal protocol for Western blot detection of Phospho-ITGB1 (Tyr795)?

For optimal Western blot detection of Phospho-ITGB1 (Tyr795), researchers should implement a comprehensive protocol that addresses sample preparation, electrophoresis, and immunodetection. Begin by lysing cells in a buffer containing strong phosphatase inhibitors (including sodium orthovanadate, sodium fluoride, and phosphatase inhibitor cocktails) to preserve phosphorylation status . Use RIPA or NP-40 based buffers with protease inhibitors, and maintain samples on ice throughout processing to minimize protein degradation . For electrophoresis, prepare 6-8% SDS-PAGE gels to optimize separation of high molecular weight ITGB1 (approximately 140kDa) . Transfer proteins to PVDF membranes (rather than nitrocellulose) using a wet transfer system at lower voltage for extended periods (overnight at 30V at 4°C) to ensure complete transfer of large proteins . During blocking, use 5% BSA in TBST rather than milk, as milk contains phosphatases that may reduce signal . Apply the Phospho-ITGB1 (Tyr795) antibody at a dilution of 1:1000 in 5% BSA/TBST and incubate overnight at 4°C with gentle rocking . After thorough washing (at least 3×10 minutes with TBST), apply HRP-conjugated secondary antibody at 1:5000 for 1 hour at room temperature . For detection, enhanced chemiluminescence systems with longer exposure times (up to 5 minutes) may be necessary to visualize lower abundance phosphorylation signals . Including both positive controls (cells treated with pervanadate) and negative controls (samples treated with lambda phosphatase) can validate signal specificity .

What approaches can be used to validate the specificity of Phospho-ITGB1 (Tyr795) antibody signals?

Validating the specificity of Phospho-ITGB1 (Tyr795) antibody signals requires a multi-faceted approach. The most definitive validation method involves peptide competition assays, where pre-incubation of the antibody with the phosphorylated peptide immunogen should abolish the signal, while pre-incubation with the non-phosphorylated version of the same peptide should not affect detection . This confirms phospho-specificity at the correct epitope. Additionally, researchers should perform phosphatase treatment controls, where sample aliquots are treated with lambda phosphatase prior to immunoblotting, which should eliminate signal from a truly phospho-specific antibody . Another validation approach includes using ITGB1 knockdown or knockout models, where the signal should be significantly reduced or absent compared to wild-type samples . Site-directed mutagenesis of the Tyr795 residue to phenylalanine (Y795F) provides another powerful validation tool, as this conservative mutation prevents phosphorylation while minimally affecting protein structure . For further confirmation, researchers can use stimulation/inhibition paradigms with compounds known to affect ITGB1 phosphorylation, such as integrin ligands or specific kinase inhibitors, and observe the expected changes in signal intensity . Finally, comparing results from multiple phospho-ITGB1 (Tyr795) antibodies from different vendors or different clones can provide additional confidence in signal specificity and reliability .

What sample preparation techniques preserve Phospho-ITGB1 (Tyr795) for optimal detection?

Preserving Phospho-ITGB1 (Tyr795) during sample preparation requires careful attention to prevent artificial dephosphorylation while maintaining protein integrity. Begin sample collection by rapidly washing cells with ice-cold PBS containing 1mM sodium orthovanadate to inhibit phosphatase activity immediately . For adherent cells studying integrin function, consider using detachment methods that preserve integrin-associated complexes, such as scraping rather than enzymatic dissociation, as trypsin can cleave the extracellular domain of integrins and alter signaling . Use lysis buffers containing robust phosphatase inhibitor cocktails including sodium orthovanadate (1mM), sodium fluoride (10mM), sodium pyrophosphate (5mM), and β-glycerophosphate (10mM), alongside traditional protease inhibitors . Maintain samples at 4°C throughout processing and minimize handling time between cell disruption and protein denaturation . For tissues, snap-freezing in liquid nitrogen immediately after collection, followed by pulverization while frozen before addition of lysis buffer, helps preserve phosphorylation status . Consider subcellular fractionation techniques that include phosphatase inhibitors at each step to study compartment-specific phosphorylation patterns, particularly given ITGB1's diverse cellular localizations including membrane, endosomes, and cytoskeleton-associated pools . When preparing samples for electrophoresis, heat at 70°C rather than 95°C for shorter durations (5-7 minutes) to reduce potential dephosphorylation while still ensuring denaturation of this large transmembrane protein .

How can researchers troubleshoot weak or inconsistent Phospho-ITGB1 (Tyr795) signals in Western blots?

When encountering weak or inconsistent Phospho-ITGB1 (Tyr795) signals in Western blots, researchers should systematically evaluate and optimize each experimental stage. For sample preparation, increase the concentration of phosphatase inhibitors or use fresh inhibitor cocktails, as phosphatase inhibitor potency can diminish over time . Consider enriching phosphoproteins using titanium dioxide or immobilized metal affinity chromatography (IMAC) prior to analysis, which can significantly enhance detection of low-abundance phosphorylation events . If signals remain weak, optimize protein loading by increasing the amount loaded (up to 100μg per lane) while ensuring even loading across comparisons . For the immunodetection step, decrease antibody dilution (to 1:500 or even 1:250) and extend primary antibody incubation time to 36-48 hours at 4°C with gentle agitation . More sensitive detection systems, such as enhanced chemiluminescence substrates with femtogram sensitivity or fluorescence-based Western detection, may reveal signals that traditional methods miss . If band intensity varies between experiments, standardize cell culture conditions, as integrin phosphorylation is highly sensitive to cell density, matrix composition, and growth factor stimulation . Furthermore, the choice of molecular weight markers can impact band identification; use pre-stained markers visible during transfer to confirm complete protein transfer of high molecular weight regions where ITGB1 migrates (approximately 140kDa) . Finally, consider the timing of your experimental intervention, as Tyr795 phosphorylation may be transient following stimulation, necessitating careful time-course studies to capture peak phosphorylation levels .

What are the common sources of false positive and false negative results when detecting Phospho-ITGB1 (Tyr795)?

Understanding potential sources of false results is crucial for accurate interpretation of Phospho-ITGB1 (Tyr795) data. False positives commonly arise from cross-reactivity with similar phosphorylation motifs on other proteins, particularly other integrin beta subunits that share sequence homology with ITGB1 . To address this, always validate antibody specificity using ITGB1 knockdown controls or competing with the specific phosphopeptide used as immunogen . Another source of false positives is inadequate blocking or excessive antibody concentration, resulting in non-specific binding; optimize blocking conditions using 5% BSA rather than milk (which contains phosphatases) and titrate antibody concentrations . False negatives frequently result from dephosphorylation during sample preparation; ensure phosphatase inhibitor cocktails are fresh and used at appropriate concentrations throughout all preparation steps . Inefficient protein extraction can also yield false negatives, particularly when studying membrane-associated ITGB1; use detergent combinations like RIPA buffer or consider membrane-specific extraction protocols . Another common source of false negatives is incomplete transfer of high molecular weight proteins during Western blotting; optimize transfer conditions using lower voltage for longer durations or specialized buffer systems for large proteins . Cell culture conditions dramatically affect integrin phosphorylation status; consistency in passage number, confluence, and extracellular matrix components is essential for reproducible results . Finally, remember that phosphorylation events may be temporally regulated or stimulus-dependent, so negative results may simply reflect the timing of analysis rather than true absence of phosphorylation .

How can Phospho-ITGB1 (Tyr795) antibody be integrated into multi-parameter analysis of integrin signaling networks?

Integrating Phospho-ITGB1 (Tyr795) antibody into multi-parameter analyses enables comprehensive mapping of integrin signaling networks. Researchers can combine this antibody with multiplexed phosphoproteomic approaches to simultaneously monitor multiple phosphorylation events across integrin-associated signaling pathways . For example, parallel analysis of ITGB1 Tyr795 phosphorylation alongside FAK, Src, paxillin, and ERK phosphorylation can reveal pathway activation hierarchies and feedback mechanisms . Proximity ligation assays (PLA) using Phospho-ITGB1 (Tyr795) antibody paired with antibodies against potential interaction partners can identify phosphorylation-dependent protein complexes with spatial resolution in situ . For high-throughput screening applications, researchers can employ reverse-phase protein array (RPPA) technology with validated Phospho-ITGB1 (Tyr795) antibody to assess phosphorylation across large sample sets, such as patient-derived samples or drug treatment panels . Co-immunoprecipitation studies using Phospho-ITGB1 (Tyr795) antibody followed by mass spectrometry can identify proteins that specifically interact with the phosphorylated form versus the non-phosphorylated form of ITGB1, revealing phosphorylation-dependent interaction networks . Single-cell analysis techniques, including mass cytometry (CyTOF) or imaging mass cytometry with metal-conjugated Phospho-ITGB1 (Tyr795) antibody, allow researchers to correlate integrin phosphorylation with cell phenotypes at single-cell resolution within heterogeneous populations . For dynamic studies, researchers can combine this antibody with live-cell biosensors that report on downstream signaling events, correlating Tyr795 phosphorylation status with real-time signaling outputs and cellular behaviors .

What are the emerging applications of Phospho-ITGB1 (Tyr795) antibody in studying disease mechanisms?

The Phospho-ITGB1 (Tyr795) antibody is becoming increasingly valuable for investigating disease mechanisms across multiple pathological contexts. In cancer research, this antibody can reveal altered integrin phosphorylation patterns associated with invasive phenotypes, metastatic potential, and therapy resistance mechanisms . Researchers are utilizing the antibody in patient-derived xenograft models and tissue microarrays to correlate Tyr795 phosphorylation with clinical outcomes and treatment responses, potentially identifying novel prognostic biomarkers . In the cardiovascular field, the antibody is being applied to study integrin-mediated mechanotransduction in cardiomyocytes and vascular cells under pathological mechanical stress, revealing how altered phosphorylation contributes to cardiac remodeling and atherosclerosis progression . For neurodegenerative diseases, researchers are investigating the role of ITGB1 Tyr795 phosphorylation in neuronal migration, axon guidance, and synaptic plasticity, with implications for understanding developmental disorders and neurodegeneration . In immunological contexts, the antibody is helping elucidate how integrin phosphorylation regulates immune cell adhesion, migration, and immune synapse formation, with potential relevance to autoimmune conditions and immunotherapy responses . Fibrotic diseases represent another emerging application area, where researchers are examining how Tyr795 phosphorylation influences fibroblast activation and extracellular matrix deposition in organs including liver, lung, and kidney . Advances in tissue clearing and 3D imaging technologies are enabling researchers to map Phospho-ITGB1 (Tyr795) distribution within intact tissue architectures, providing unprecedented spatial context for understanding disease-related alterations in integrin signaling .

How might technological advances improve the detection and analysis of ITGB1 Tyr795 phosphorylation in future research?

Emerging technologies promise to revolutionize detection and analysis of ITGB1 Tyr795 phosphorylation in several ways. Next-generation phospho-specific antibodies developed using synthetic antibody libraries or camelid single-domain antibodies may offer improved specificity and sensitivity compared to current polyclonal offerings . Mass spectrometry-based absolute quantification (AQUA) approaches using isotope-labeled phosphopeptides as internal standards will enable precise determination of phosphorylation stoichiometry at Tyr795, moving beyond the semi-quantitative nature of immunoblotting . Development of genetically encoded fluorescent biosensors that undergo conformational changes upon ITGB1 Tyr795 phosphorylation could enable real-time visualization of phosphorylation dynamics in living cells with subcellular resolution . Advances in super-resolution microscopy combined with highly specific Phospho-ITGB1 (Tyr795) antibodies will reveal nanoscale spatial relationships between phosphorylated integrins and other adhesion complex components, providing new insights into functional organization . CRISPR-based gene editing to introduce endogenous tags or phospho-mimetic mutations at the Tyr795 site will facilitate more physiological studies than traditional overexpression approaches . Single-molecule imaging techniques could track individual phosphorylated ITGB1 molecules within the membrane, revealing how phosphorylation affects diffusion, clustering, and endocytosis dynamics . Spatial transcriptomics and proteomics approaches may allow correlation of Tyr795 phosphorylation with gene expression and protein abundance patterns within tissue microenvironments . Finally, machine learning algorithms applied to large datasets incorporating Phospho-ITGB1 (Tyr795) measurements alongside other parameters could identify previously unrecognized patterns and relationships, generating new hypotheses about integrin regulation in normal and pathological contexts .