LPP Antibody, FITC conjugated

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Description

Introduction to LPP Antibody, FITC Conjugated

The LPP (Lipoma-preferred partner) antibody conjugated with fluorescein isothiocyanate (FITC) is a fluorescently labeled reagent designed for detecting the LPP protein, a scaffolding protein involved in cell adhesion, motility, and transcriptional regulation . FITC conjugation enables visualization via fluorescence microscopy, flow cytometry, or immunoblotting, leveraging FITC’s excitation/emission peaks at 495 nm/525 nm . This antibody is widely used in biomedical research to study LPP’s role in cancer, cardiovascular biology, and cellular dynamics .

Applications in Research

  • Cancer Studies: Detects LPP overexpression in lung, mammary, and rectal cancer tissues via IHC .

  • Cardiac Research: Labels LPP in mouse and rat cardiac muscle sections, aiding studies on heart disease .

  • Cell Motility Assays: Tracks LPP dynamics in focal adhesions during wound healing or metastasis .

Validation and Specificity Data

  • Immunofluorescence: Demonstrated in A431 cells using DyLight®488 secondary antibodies .

  • IHC Validation:

    • Antigen retrieval: EDTA buffer (pH 8.0) .

    • Blocking: 10% goat serum .

    • Signal detection: Streptavidin-Biotin-Complex (SABC) with DAB chromogen .

  • Cross-Reactivity: No background observed in CHO cells or untagged proteins .

Recommended Protocols

Immunohistochemistry (Paraffin-embedded Sections):

  1. Perform heat-mediated antigen retrieval in EDTA buffer (pH 8.0).

  2. Block with 10% goat serum.

  3. Incubate with 1 µg/mL FITC-conjugated LPP antibody overnight at 4°C .

  4. Detect using biotinylated secondary antibodies and SABC-DAB .

Flow Cytometry:

  • Dilute antibody 1:500 in PBS with 10% FBS to minimize background .

Research Findings

  • Cancer Biomarker: LPP is upregulated in human lung, breast, and rectal carcinomas, correlating with tumor progression .

  • Mechanistic Insights: LPP knockdown reduces cell migration in in vitro models, highlighting its role in metastasis .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
We typically dispatch orders within 1-3 business days of receipt. Delivery times may vary depending on the purchasing method and location. For specific delivery times, please consult your local distributors.
Synonyms
DKFZp779O0231 antibody; FLJ30652 antibody; FLJ41512 antibody; LIM domain containing preferred translocation partner in lipoma antibody; LIM domain-containing preferred translocation partner in lipoma antibody; LIM protein antibody; Lipoma preferred partner antibody; Lipoma-preferred partner antibody; lpp antibody; LPP_HUMAN antibody
Target Names
LPP
Uniprot No.

Target Background

Function
Lipoma Preferred Partner (LPP) plays a structural role in cell adhesion, contributing to cell shape maintenance and motility. Beyond its structural functions, LPP may also participate in signaling events and gene transcription activation. It could be involved in signal transduction, transmitting information from cell adhesion sites to the nucleus, integrating signals from soluble factors and cell-cell adhesion. LPP is proposed to act as a scaffold protein, facilitating the assembly of distinct protein complexes in both the cytoplasm and nucleus.
Gene References Into Functions
  1. Research indicates that LPP plays a role in invadopodia formation and is essential for mediating the metastatic potential of breast cancer cells. PMID: 28436416
  2. This study provides the first evidence for epigenetic regulation of intronic miR-28-5p expression by promoter DNA methylation of its host gene, LPP. PMID: 28775176
  3. Meta-analysis provides strong evidence suggesting that polymorphisms in LPP and TAGAP genes are potential risk factors for celiac disease in European and American populations. PMID: 28208589
  4. This research highlights the importance of PP2A complexes with the LIM domains of lipoma-preferred partner in cell adhesion and migration dynamics. PMID: 26945059
  5. Alterations in LPP expression significantly impact the collective behavior and metastatic potential of cancer cells. PMID: 26028032
  6. Results indicate that rs4686484 is the functional variant in this locus, while LPP expression is decreased in celiac disease. PMID: 24334606
  7. The 3q28 rs6444305 polymorphism in the LPP gene has been associated with follicular lymphoma. PMID: 25279986
  8. Interaction between LPP and alpha-actinin, an actin cross-linking protein, is crucial for TGFbeta-induced migration and invasion of ErbB2-expressing breast cancer cells. PMID: 23447672
  9. Three polymorphisms of the LPP gene were identified and replicated in a larger cohort of 1132 PCOS cases and 1142 controls. These findings suggest that the LPP gene may be a novel candidate for Polycystic Ovary Syndrome (PCOS). PMID: 23056290
  10. The results suggest that genomic alterations and clearly deleterious sequence changes in the LPP gene are not a common cause of esophageal atresia/tracheoesophageal fistula or VACTERL association. PMID: 22639458
  11. LPP is a nucleocytoplasmic shuttle protein that connects focal adhesion dynamics to the transcriptional machinery. PMID: 19701494
  12. Gene expression levels of bcl-6, lpp, and miR-28 vary across different diffuse large B cell lymphoma cell lines. PMID: 19236753
  13. Haploinsufficiency of LPP may be a novel cause of conotruncal cardiac anomalies, particularly forms of tetralogy of Fallot. PMID: 20949626
  14. LPP possesses specific domains that enable its focal adhesion and nuclear targeting capacity. PMID: 12441356
  15. The HMGA2-LPP fusion transcript was observed in only 1 out of 61 karyotypically normal pulmonary chondroid hamartomas. PMID: 12505264
  16. LPP and Scrib proteins colocalize in cell-cell contacts. This interaction links Scrib to a communication pathway between cell-cell contacts and the nucleus, implicating LPP in Scrib-associated functions. PMID: 15649318
  17. Translocation in chromosomes 3 and 12 involves fusion of this protein with HMGA2 in pulmonary chondroid hamartoma. PMID: 16271958
  18. The HMGA2-LPP fusion promotes chondrogenesis by upregulating cartilage-specific collagen gene expression through the N-terminal DNA binding domains. PMID: 16375854
  19. LPP appears to be a vascular smooth muscle (SMSC) differentiation marker that plays a role in regulating SMC migration. PMID: 16397143
  20. LPP can shuttle between the cytoplasm and the nucleus, suggesting they may transfer information directly from the cytoskeleton or focal adhesions to the transcription machinery. PMID: 16484626
  21. By manipulating LPP levels, it was demonstrated that it acts to upregulate the transactivation capacity of PEA3. PMID: 16738319
  22. The function of LPP and palladin is context-dependent, playing a critical role in cytoskeletal remodeling. They respond to signals induced by vascular injury as well as signals that induce smooth muscle cell hypertrophy, such as angiotensin II. PMID: 17322171
  23. Expression of LPP and palladin are modulated by a combination of mechanical cues, oxidative stress, and substrate composition, leading to their up or down regulation in vessel wall injury and early atherogenesis. PMID: 19205907

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Database Links

HGNC: 6679

OMIM: 600700

KEGG: hsa:4026

STRING: 9606.ENSP00000318089

UniGene: Hs.720220

Involvement In Disease
A chromosomal aberration involving LPP is associated with a subclass of benign mesenchymal tumors known as lipomas. Translocation t(3;12)(q27-q28;q13-q15) with HMGA2 is shown in lipomas.; DISEASE: Note=A chromosomal aberration involving LPP is associated with pulmonary chondroid hamartomas. Translocation t(3;12)(q27-q28;q14-q15) with HMGA2 is detected in pulmonary chondroid hamartomas.; DISEASE: Note=A chromosomal aberration involving LPP is associated with parosteal lipomas. Translocation t(3;12)(q28;q14) with HMGA2 is also shown in one parosteal lipoma.; DISEASE: Note=A chromosomal aberration involving LPP is associated with acute monoblastic leukemia. Translocation t(3;11)(q28;q23) with KMT2A/MLL1 is associated with acute monoblastic leukemia.
Protein Families
Zyxin/ajuba family
Subcellular Location
Nucleus. Cytoplasm. Cell junction. Cell membrane. Note=Found in the nucleus, in the cytoplasm and at cell adhesion sites. Shuttles between the cytoplasm and the nucleus. It has been found in sites of cell adhesion such as cell-to-cell contact and focal adhesion which are membrane attachment sites of cells to the extracellular matrix. Mainly nuclear when fused with HMGA2/HMGIC and KMT2A/MLL1.
Tissue Specificity
Expressed in a wide variety of tissues but no or very low expression in brain and peripheral leukocytes.

Q&A

What is LPP protein and why is it significant for research?

LPP (Lipoma-preferred partner homolog) is a multifunctional protein that plays a structural role at cell adhesion sites, maintaining cell shape and motility. Beyond these structural functions, LPP is implicated in signaling events and gene transcription activation. Its significance stems from its involvement in signal transduction from cell adhesion sites to the nucleus, enabling successful integration of signals from soluble factors and cell-cell adhesion sites. LPP also serves as a scaffold protein upon which distinct protein complexes assemble in both cytoplasm and nucleus . Recent studies have identified LPP as a potential biomarker for treatment response in gastric cancer, making it increasingly relevant for cancer research and immunotherapy investigations .

What are the key specifications of LPP Antibody, FITC conjugated?

LPP Antibody (FITC) is a rabbit polyclonal antibody specific to LPP with the following technical specifications:

ParameterSpecification
CategoryPrimary Antibodies
Immunogen TargetLipoma-preferred partner homolog (LPP)
HostRabbit
ReactivityHuman
ClonalityPolyclonal
ConjugationFITC (Fluorescein isothiocyanate)
IsotypeIgG
Purity> 95%
Purification MethodProtein G
FormLiquid
Buffer Composition0.01 M PBS, pH 7.4, 0.03% Proclin-300, 50% Glycerol
Storage RequirementsAliquot and store at -20°C; avoid light exposure and freeze/thaw cycles
UniProt IDQ93052
Gene ID4026

These specifications provide critical information for researchers to properly incorporate this antibody into their experimental design and protocols .

How should researchers optimize storage and handling of LPP Antibody-FITC to maintain functionality?

To maintain optimal functionality of LPP Antibody-FITC, researchers should follow these methodological guidelines:

  • Storage temperature: Aliquot the antibody and store at -20°C to prevent protein degradation .

  • Light protection: FITC is photosensitive, so the antibody should be protected from light during storage and handling to prevent photobleaching. Use amber tubes or wrap containers in aluminum foil .

  • Avoid freeze/thaw cycles: Repeated freezing and thawing can damage antibody structure and reduce fluorescence intensity. Create single-use aliquots upon receipt .

  • Buffer conditions: The antibody is supplied in a buffer containing 50% glycerol which helps maintain stability. Do not dilute the stock solution until ready for use .

  • Working temperature: When actively using the antibody, keep it on ice and in low-light conditions to minimize degradation.

  • Centrifugation: Briefly centrifuge the vial before opening to collect all liquid at the bottom of the tube.

  • Quality testing: Periodically verify the antibody's performance using positive control samples if stored for extended periods.

Following these handling procedures will help ensure consistent and reliable experimental results when using this antibody .

What is the primary application of LPP Antibody-FITC in basic research?

The primary application of LPP Antibody-FITC in basic research is for direct visualization and localization of LPP protein in cells and tissues. This antibody enables several key methodologies:

  • Immunofluorescence microscopy: The direct FITC conjugation allows for one-step detection of LPP in fixed cells and tissue sections. This is particularly useful for studying LPP's distribution at cell adhesion sites and in the nucleus .

  • Flow cytometry (FACS): The antibody can be used to quantify LPP expression levels across different cell populations, providing quantitative analysis without requiring secondary antibodies .

  • Cell surface protein detection: Although LPP is primarily intracellular, certain experimental systems may express recombinant LPP on cell surfaces, where this antibody can be valuable for confirming successful surface display .

  • Protein localization studies: The antibody allows researchers to investigate how LPP shuttles between adhesion sites and the nucleus in response to various cellular stimuli .

  • Co-localization experiments: When combined with other fluorescently labeled antibodies targeting different markers, LPP-FITC antibody enables studies of protein-protein interactions and complex formation .

These applications provide fundamental insights into LPP's biological roles in cellular adhesion, signaling, and gene regulation .

How can researchers design optimal immunofluorescence protocols using LPP Antibody-FITC?

Designing optimal immunofluorescence protocols with LPP Antibody-FITC requires careful consideration of multiple methodological factors:

  • Sample preparation:

    • Fix cells with 3-4% paraformaldehyde to preserve cellular architecture

    • Permeabilize with 0.1-0.5% Triton X-100 to allow antibody access to intracellular LPP

    • Consider dual fixation protocols (paraformaldehyde followed by methanol) for preserving both cytoskeletal and nuclear structures

  • Blocking strategy:

    • Block with 3% bovine serum albumin (BSA) in PBS for 30-60 minutes at room temperature to minimize non-specific binding

    • Include 0.1% glycine to quench any remaining aldehyde groups from fixation

  • Antibody incubation:

    • Begin with manufacturer's recommended dilution (optimal dilutions should be determined experimentally)

    • Incubate at 4°C for 4 hours or overnight in a humidified chamber

    • For dual labeling experiments, carefully plan fluorophore combinations to avoid spectral overlap with FITC (excitation ~495nm, emission ~520nm)

  • Washing protocol:

    • Perform 5 sequential washes with PBS to eliminate unbound antibody and reduce background fluorescence

    • Include 0.05% Tween-20 in wash buffer to further reduce non-specific binding

  • Mounting and visualization:

    • Use anti-fade mounting medium with DAPI for nuclear counterstaining

    • Image using appropriate filter sets for FITC detection

    • Apply confocal microscopy for high-resolution subcellular localization studies

  • Controls:

    • Include negative controls (omitting primary antibody)

    • Use cells with known LPP expression patterns as positive controls

    • For validation, compare results with non-FITC conjugated anti-LPP antibody and compatible secondary antibody

  • Quantification:

    • Implement consistent image acquisition parameters

    • Use software algorithms to quantify fluorescence intensity, colocalization coefficients, or subcellular distribution patterns

This detailed protocol strategy ensures reproducible and reliable detection of LPP in diverse experimental contexts .

What are the critical considerations for flow cytometry analysis using LPP Antibody-FITC?

Flow cytometry analysis using LPP Antibody-FITC requires specific technical considerations to ensure reliable and quantitative results:

  • Cell preparation protocol:

    • Harvest cells (approximately 1×10^6 cells) at optimal density

    • Use gentle cell dissociation methods to maintain cellular integrity

    • For adherent cells expressing LPP, ensure complete dissociation to single-cell suspensions

  • Fixation and permeabilization:

    • Since LPP is primarily intracellular, use appropriate fixation (2-4% paraformaldehyde) and permeabilization (0.1% saponin or 0.1-0.5% Triton X-100) reagents

    • Optimize fixation time to balance epitope preservation with cellular integrity

  • Blocking and antibody incubation:

    • Block with 2-3% BSA in PBS for 30-60 minutes at 4°C

    • Incubate with LPP-FITC antibody at optimal dilution (starting at 1:1000) for 2-4 hours at 4°C

    • Wash cells 5 times with PBS to remove unbound antibody

  • Flow cytometer setup:

    • Use appropriate laser (488 nm) and filter sets for FITC detection

    • Run single-color controls for proper compensation if performing multicolor analysis

    • Include unstained controls to establish autofluorescence baseline

  • Data acquisition considerations:

    • Collect sufficient events (minimum 10,000-20,000 cells) for statistical reliability

    • Set appropriate PMT voltages to ensure signal is within detection range

    • Record forward and side scatter parameters to distinguish viable cells

  • Analysis strategy:

    • Gate on viable single cells using FSC/SSC parameters

    • Analyze FITC signal intensity (mean/median fluorescence intensity) to quantify LPP expression levels

    • For comparison between samples, use standardized beads to calibrate fluorescence intensity

  • Validation controls:

    • Include isotype control to establish background fluorescence levels

    • Use positive and negative control cell lines with known LPP expression profiles

    • Consider using cells with LPP knockdown/overexpression as additional controls

This methodical approach ensures accurate quantification of LPP expression across different cell populations and experimental conditions .

How can researchers validate the specificity of LPP Antibody-FITC in their experimental systems?

Validating antibody specificity is crucial for ensuring experimental rigor. For LPP Antibody-FITC, implement the following comprehensive validation strategy:

  • Western blot analysis:

    • Run cell/tissue lysates known to express LPP

    • Verify detection of a single band at the expected molecular weight (~68 kDa)

    • Include positive control lysates and LPP-negative samples for comparison

  • Genetic manipulation controls:

    • Compare signal in wild-type cells versus cells with LPP knockdown (siRNA/shRNA)

    • Analyze LPP-overexpressing cells to confirm increased signal intensity

    • Use CRISPR/Cas9-mediated knockout cells as definitive negative controls

  • Peptide competition assay:

    • Pre-incubate the antibody with excess immunizing peptide

    • Confirm signal reduction or elimination in subsequent detection assays

    • Include non-competing peptide controls to confirm specificity

  • Cross-reactivity assessment:

    • Test antibody against recombinant LPP protein

    • Evaluate reactivity in systems expressing LPP homologs or related proteins

    • Verify human reactivity as specified in the product information

  • Immunoprecipitation validation:

    • Perform immunoprecipitation followed by mass spectrometry

    • Confirm LPP peptides are among precipitated proteins

    • Analyze for potential off-target binding partners

  • Multi-technique concordance:

    • Compare LPP detection patterns across immunofluorescence, flow cytometry, and Western blotting

    • Correlate protein expression with mRNA levels using qRT-PCR

    • Consistency across methods strengthens validation

  • Subcellular localization verification:

    • Confirm that observed LPP localization matches established patterns (adhesion sites and nucleus)

    • Use subcellular fractionation followed by Western blotting to verify compartment-specific distribution

This systematic validation approach ensures that experimental findings attributed to LPP detection are genuine and not artifacts of non-specific antibody binding .

What technical factors affect fluorescence intensity quantification when using LPP Antibody-FITC?

Accurate quantification of fluorescence intensity when using LPP Antibody-FITC is influenced by numerous technical factors that must be carefully controlled:

  • Intrinsic FITC properties:

    • pH sensitivity: FITC fluorescence decreases at acidic pH; maintain buffers at pH 7.2-8.0

    • Photobleaching vulnerability: FITC loses approximately 5-10% intensity per minute of continuous exposure to excitation light

    • Quantum yield variations: Temperature and solvent conditions can affect fluorescence efficiency

  • Sample preparation influences:

    • Fixation method: Different fixatives (paraformaldehyde, methanol) can affect epitope accessibility and fluorophore performance

    • Permeabilization extent: Over-permeabilization may cause protein leakage; insufficient permeabilization limits antibody access

    • Autofluorescence: Cellular components (NADH, flavins, elastin) can contribute background fluorescence in the FITC spectrum

  • Instrumentation variables:

    • Excitation source stability: Fluctuations in laser/lamp intensity directly affect fluorescence measurements

    • Detector sensitivity: PMT voltage settings alter signal amplification; standardize between experiments

    • Optical path: Lens quality, cleanliness, and alignment impact light collection efficiency

  • Acquisition parameters:

    • Exposure time: Must be standardized across compared samples

    • Dynamic range: Avoid pixel saturation which prevents accurate intensity comparisons

    • Z-stack sampling: For 3D specimens, consistent z-step size and range are essential

  • Analytical considerations:

    • Background subtraction methods: Different approaches yield varying results

    • Segmentation algorithms: Cell/nuclear boundary definition affects intensity measurements

    • Normalization strategies: Choose appropriate reference standards (internal controls, calibration beads)

  • Biological variables:

    • Cell cycle stage: LPP expression and localization may vary throughout the cell cycle

    • Cell density effects: Contact inhibition may alter LPP expression and distribution

    • Sample heterogeneity: Mixed cell populations require careful gating or image segmentation

To achieve reliable quantification, researchers should implement standardized protocols with appropriate controls, calibration standards, and statistical methods for comparing fluorescence intensities across experimental conditions .

How does LPP expression relate to immunotherapy response, and how can this be studied using LPP Antibody-FITC?

Recent research has revealed important correlations between LPP expression and immunotherapy response, which can be methodically investigated using LPP Antibody-FITC techniques:

  • Clinical correlations with immunotherapy:

    • Lower LPP expression has been observed in gastric cancer patients responsive to anti-PD1 therapy compared to non-responders

    • High LPP expression correlates with higher Tumor Immune Dysfunction and Exclusion (TIDE) scores, predicting poorer response to immune checkpoint blockade

    • Similar trends have been observed in melanoma patients, suggesting a potentially broader role across cancer types

  • Methodological approaches using LPP Antibody-FITC:

    a) Tissue microarray analysis:

    • Apply LPP Antibody-FITC to tissue microarrays from patient cohorts with known immunotherapy response data

    • Quantify LPP expression levels and correlate with clinical outcomes

    • Implement multi-parameter analysis incorporating T-cell markers

    b) Flow cytometric profiling:

    • Use LPP Antibody-FITC in combination with immune cell markers (CD4, CD8, CD45)

    • Analyze relationships between LPP expression and T-cell subtype distribution

    • Sort cell populations based on LPP expression for further functional studies

    c) In vitro immune co-culture systems:

    • Label tumor cells or fibroblasts with LPP Antibody-FITC

    • Co-culture with immune cells and assess functional responses

    • Measure cytokine production, T cell activation, and tumor cell killing

  • Mechanism investigation:

    • Examine how LPP modulates T-cell infiltration patterns

    • Investigate LPP's role in T-cell activation states (resting vs. activated CD4+ memory T cells)

    • Analyze how LPP expression affects antigen presentation and immune synapse formation

  • Translational implementation:

    • Develop standardized LPP quantification protocols for potential biomarker use

    • Establish threshold values for predicting immunotherapy response

    • Combine with other predictive markers for enhanced patient stratification

  • Data analysis approach:

    • Implement machine learning algorithms to identify complex patterns

    • Construct multivariate models incorporating LPP expression and immune parameters

    • Validate findings across independent patient cohorts

This research direction provides valuable insights for patient stratification and personalized immunotherapy approaches, potentially improving treatment outcomes in various cancer types .

What protocol modifications are necessary for multiplexed imaging with LPP Antibody-FITC and other fluorescent markers?

Successful multiplexed imaging with LPP Antibody-FITC alongside other fluorescent markers requires specific protocol modifications to achieve clear signal separation and minimize artifacts:

  • Fluorophore selection and combination strategy:

    • Choose complementary fluorophores with minimal spectral overlap with FITC (Ex: 495nm, Em: 520nm)

    • Recommended combinations include FITC/TRITC/DAPI or FITC/Cy5/DAPI

    • Avoid fluorophores with significant bleed-through into the FITC channel (e.g., GFP, YFP)

  • Sequential staining approach:

    • For directly conjugated antibodies, apply in order of increasing wavelength to reduce photobleaching effects

    • When combining with non-conjugated antibodies requiring secondaries, optimize blocking steps between rounds

  • Antibody dilution and interaction considerations:

    • Re-optimize antibody dilutions when used in combination (often requiring higher dilutions)

    • Test for potential cross-reactivity between antibodies from the same species

    • Consider antibody isotype and subclass to avoid detection conflicts

  • Microscopy setup parameters:

    • Implement sequential scanning mode rather than simultaneous acquisition

    • Configure channel-specific laser power and detector sensitivity settings

    • Utilize narrow bandpass filters to minimize spectral overlap

  • Advanced controls for multiplexed imaging:

    • Single-stained controls for each fluorophore to establish baseline signals

    • Fluorescence minus one (FMO) controls to accurately set gates/thresholds

    • Include absorption controls to detect and correct for energy transfer between fluorophores

  • Image acquisition optimization:

    • Start acquisition with longer wavelengths to minimize photobleaching of FITC

    • Standardize exposure times across all comparable samples

    • Implement line averaging to improve signal-to-noise ratio

    • Use optical sectioning (confocal or deconvolution) to improve resolution of colocalization

  • Post-acquisition analysis strategies:

    • Apply spectral unmixing algorithms to separate overlapping signals

    • Use colocalization analysis software with appropriate coefficients (Pearson's, Manders')

    • Implement consistent thresholding methods for signal segregation

This methodological approach ensures accurate multiplexed detection of LPP alongside other proteins of interest in complex biological samples .

How can site-specific conjugation methods improve LPP antibody performance compared to traditional FITC conjugation?

Site-specific conjugation technologies offer significant advantages over traditional random FITC conjugation methods for LPP antibodies:

  • Selenocysteine interface technology:

    • Incorporates selenocysteine (Sec), the 21st amino acid, at specific C-terminal positions

    • Exploits unique chemical reactivity of selenocysteine for selective conjugation

    • Creates precisely defined 1:1 stoichiometry between antibody and fluorophore

    • Maintains full antigen binding capability and effector functions

  • Performance advantages over traditional FITC conjugation:

    • Homogeneity: Traditional methods produce heterogeneous mixtures with variable drug-to-antibody ratios; site-specific methods generate uniform conjugates

    • Reproducibility: Batch-to-batch consistency is significantly improved with defined conjugation sites

    • Functional preservation: Site-specific methods avoid modification of antigen-binding regions, maintaining full binding capacity

    • Signal consistency: Uniform fluorophore-to-antibody ratio ensures consistent signal intensity per antibody molecule

  • Advanced conjugation approaches for LPP antibodies:

    • Dual C-terminal selenocysteine engineering allows higher fluorophore loading without compromising specificity

    • Enzymatic approaches using sortase A or transglutaminase for site-specific labeling

    • Click chemistry methods for bioorthogonal conjugation

    • Unnatural amino acid incorporation for expanded conjugation chemistry options

  • Comparative performance metrics:

    ParameterTraditional FITC ConjugationSite-Specific Conjugation
    StoichiometryVariable (0-8 FITC/antibody)Defined (typically 1-2/antibody)
    Batch consistencyModerate to lowHigh
    Antigen bindingOften partially reducedFully maintained
    Signal-to-noise ratioVariableConsistent and optimized
    Photobleaching resistanceStandardCan be improved with rational design
  • Implementation considerations:

    • Initial investment in antibody engineering is higher but yields superior long-term performance

    • Advanced conjugation chemistry may require specialized expertise

    • Quality control methods must be adapted to verify site-specific modification

These site-specific conjugation approaches provide researchers with more consistent, reliable, and functionally preserved LPP antibody reagents for critical applications in both research and potential therapeutic development .

What is the optimal protocol for using LPP Antibody-FITC in Western blotting applications?

While FITC-conjugated antibodies are not typically the first choice for Western blotting due to fluorescence detection limitations in this format, researchers can adapt protocols to leverage LPP Antibody-FITC in this application with the following methodological considerations:

  • Sample preparation optimization:

    • Lyse cells in RIPA or NP-40 buffer supplemented with protease inhibitors

    • Include phosphatase inhibitors if phosphorylation status affects LPP detection

    • Determine optimal protein loading (typically 20-50 μg total protein)

    • Heat samples at 95°C for 5 minutes in Laemmli buffer with β-mercaptoethanol

  • Gel electrophoresis parameters:

    • Use 8-10% polyacrylamide gels for optimal separation of LPP (~68 kDa)

    • Include molecular weight markers visible in both white light and fluorescence imaging

    • Run positive control samples (lysates with verified LPP expression)

  • Transfer considerations:

    • Optimize transfer conditions for LPP's molecular weight (typically 100V for 60-90 minutes)

    • Use PVDF membranes which provide better fluorescence signal than nitrocellulose

    • Verify transfer efficiency using reversible protein stains

  • Blocking and antibody incubation:

    • Block membranes with 3-5% BSA in TBS-T for 1 hour at room temperature

    • Incubate with LPP Antibody-FITC at optimized dilution (starting at 1:1000) overnight at 4°C

    • Protect from light during all incubation steps to prevent photobleaching

    • Wash extensively (5-6 times, 5-10 minutes each) with TBS-T

  • Detection system options:

    • Direct fluorescence detection: Use fluorescence imaging systems with appropriate excitation/emission settings for FITC

    • Indirect detection: Use anti-FITC antibodies conjugated with HRP followed by chemiluminescent detection

    • Dual verification: If signal is weak, follow with standard anti-LPP primary and appropriate secondary for confirmation

  • Imaging and quantification:

    • Use fluorescence scanners with 488 nm excitation capability

    • Implement exposure settings below saturation for accurate quantification

    • Include loading controls (GAPDH, β-actin) detected with spectrally distinct fluorophores

    • Use analysis software to normalize band intensity to loading controls

  • Troubleshooting considerations:

    • If direct fluorescence signal is weak, consider anti-FITC amplification or switch to conventional indirect detection

    • Minimize environmental light exposure during all steps

    • Optimize antibody concentration if background is high or specific signal is low

This adapted protocol allows researchers to utilize LPP Antibody-FITC in Western blotting applications while maximizing detection sensitivity and specificity .

How can LPP Antibody-FITC be used to investigate the relationship between LPP and cell adhesion dynamics?

LPP Antibody-FITC provides powerful capabilities for investigating LPP's role in cell adhesion dynamics through the following methodological approaches:

  • Live-cell imaging strategies:

    • Microinjection of LPP Antibody-FITC into living cells to track endogenous LPP

    • Combination with fluorescently tagged adhesion proteins (paxillin-mCherry, vinculin-mRFP)

    • Time-lapse microscopy to capture dynamic assembly/disassembly of adhesion complexes

    • FRAP (Fluorescence Recovery After Photobleaching) to measure LPP turnover rates at adhesion sites

  • Adhesion perturbation experiments:

    • Monitor LPP redistribution during cell adhesion to different ECM components (fibronectin, collagen, laminin)

    • Track LPP dynamics during force application using stretch chambers or micropatterned substrates

    • Analyze LPP localization following cytoskeletal disruption (cytochalasin D, nocodazole)

    • Quantify adhesion strength using centrifugal or fluidic detachment assays in LPP-manipulated cells

  • Advanced microscopy techniques:

    • Super-resolution microscopy (STORM, PALM) to visualize nanoscale organization of LPP within adhesion complexes

    • TIRF (Total Internal Reflection Fluorescence) microscopy to selectively image LPP at basal adhesion sites

    • FRET analysis using LPP Antibody-FITC and complementary fluorophore-labeled adhesion proteins to detect direct molecular interactions

    • Correlative light-electron microscopy to contextualize LPP localization with ultrastructural features

  • Mutation and domain analysis:

    • Compare localization patterns of wild-type vs. mutant LPP using domain-specific antibodies

    • Assess effects of LPP phosphorylation state on adhesion dynamics

    • Evaluate nucleus-cytoplasm shuttling using nuclear export/import inhibitors

  • Quantitative analysis approaches:

    • Measure adhesion complex assembly/disassembly rates in relation to LPP recruitment

    • Calculate spatial-temporal correlation between LPP intensity and adhesion maturation markers

    • Develop computational models predicting LPP contribution to adhesion mechanics

  • Functional correlates:

    • Monitor cell migration speed and directionality in relation to LPP dynamics

    • Analyze mechanical properties (stiffness, contractility) using traction force microscopy

    • Quantify signal transduction events downstream of LPP-containing adhesions

This integrated methodological framework enables comprehensive investigation of LPP's structural and signaling roles in cell adhesion dynamics, providing insights into its functions in normal physiology and disease contexts .

How can LPP Antibody-FITC be used to evaluate LPP as a prognostic biomarker in cancer research?

LPP Antibody-FITC offers valuable methodological approaches for evaluating LPP as a prognostic biomarker in cancer research:

These methodological approaches enable robust evaluation of LPP as a prognostic biomarker, potentially improving patient stratification and treatment selection, particularly for immunotherapy in gastric cancer and other malignancies .

What are the methodological considerations for using LPP Antibody-FITC in high-throughput screening applications?

Implementing LPP Antibody-FITC in high-throughput screening requires specific methodological considerations to ensure data quality, reproducibility, and scalability:

  • Assay miniaturization strategy:

    • Optimize for 96-, 384-, or 1536-well plate formats

    • Determine minimum cell density required for reliable LPP detection

    • Establish minimum antibody concentration that maintains signal-to-noise ratio

    • Develop automated liquid handling protocols for consistent reagent dispensing

  • Automated sample processing:

    • Implement robotic systems for cell seeding, fixation, permeabilization, and staining

    • Standardize fixation protocols to preserve LPP epitopes while allowing antibody penetration

    • Optimize washing steps to minimize well-to-well variability

    • Develop barcoding systems for sample tracking and quality control

  • Image acquisition parameters:

    • Configure automated microscopy with appropriate optical settings for FITC detection

    • Establish consistent exposure settings to enable cross-plate comparisons

    • Implement autofocus algorithms optimized for your specific cell types

    • Determine optimal sampling (fields per well) to balance throughput with statistical power

  • High-content analysis pipeline:

    • Develop segmentation algorithms for accurate cell identification

    • Extract multiparametric features (intensity, texture, morphology, subcellular distribution)

    • Implement machine learning approaches for phenotypic classification

    • Establish quality control metrics to flag and exclude problematic wells/fields

  • Validation controls and standards:

    • Include plate-specific positive and negative controls

    • Implement positional controls to detect edge effects

    • Use fluorescence calibration beads to normalize signal intensity between plates and days

    • Establish Z'-factor criteria for assay quality assessment

  • Data management and analysis:

    • Develop database structures to handle large image and feature datasets

    • Implement normalization methods to account for plate-to-plate variation

    • Establish statistical thresholds for hit identification

    • Create visualization tools for multidimensional data exploration

  • Specific applications with LPP Antibody-FITC:

    • Drug screening to identify compounds modulating LPP expression or localization

    • siRNA/CRISPR screens to identify genes affecting LPP function

    • Identifying compounds that might reverse high LPP expression in cancer samples

    • Screening for molecules that affect LPP's interaction with the immune microenvironment

These methodological considerations enable efficient implementation of LPP Antibody-FITC in high-throughput screening platforms, facilitating discovery of compounds or genetic factors that modulate LPP biology in normal physiology and disease contexts .

Future research directions for LPP antibody applications

The development and application of LPP antibodies, particularly FITC-conjugated versions, continues to evolve with several promising future research directions:

  • Advanced conjugation technologies:

    • Expansion of selenocysteine interface technology for site-specific conjugation of LPP antibodies with improved fluorophores beyond FITC

    • Development of dual-conjugated antibodies combining FITC with complementary probes for multimodal imaging

    • Creation of photoactivatable LPP antibody conjugates for super-resolution microscopy applications

  • Clinical translation:

    • Standardization of LPP detection protocols for potential diagnostic applications

    • Development of companion diagnostic assays using LPP antibodies to predict immunotherapy response

    • Integration of LPP detection into multiplexed diagnostic platforms for comprehensive tumor profiling

  • Mechanistic investigations:

    • Elucidation of LPP's role in mediating tumor-immune interactions using advanced antibody-based imaging

    • Investigation of LPP's function in cellular mechanotransduction using force-sensitive antibody conjugates

    • Exploration of LPP's involvement in other disease contexts beyond cancer

  • Technological innovations:

    • Integration with emerging spatial transcriptomics techniques for correlative protein-RNA analysis

    • Development of intrabody applications for live-cell tracking of endogenous LPP

    • Implementation in tissue clearing and 3D imaging protocols for volumetric analysis

  • Therapeutic applications:

    • Exploration of anti-LPP antibodies as potential therapeutic agents

    • Development of antibody-drug conjugates targeting LPP in appropriate disease contexts

    • Investigation of combination approaches targeting LPP alongside immune checkpoint inhibitors

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