CREB3 Antibody

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Buffer
PBS with 0.02% Sodium Azide, 50% Glycerol, pH 7.3. Store at -20°C. Avoid freeze/thaw cycles.
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Synonyms
CREB3; LZIP; Cyclic AMP-responsive element-binding protein 3; CREB-3; cAMP-responsive element-binding protein 3; Leucine zipper protein; Luman; Transcription factor LZIP-alpha
Target Names
Uniprot No.

Target Background

Function
CREB3 is an endoplasmic reticulum (ER)-bound, sequence-specific transcription factor that directly binds DNA and activates transcription. It plays a crucial role in the unfolded protein response (UPR), promoting cell survival in the face of ER stress-induced apoptosis. CREB3 is also implicated in cell proliferation, migration, and differentiation, tumor suppression, and inflammatory gene expression. It acts as a positive regulator of LKN-1/CCL15-induced chemotaxis signaling of leukocyte cell migration. CREB3 associates with chromatin at the HERPUD1 promoter and induces transcriptional activation of chemokine receptors. This is the transcriptionally active form that translocates to the nucleus and activates unfolded protein response (UPR) target genes during endoplasmic reticulum (ER) stress response. It binds the cAMP response element (CRE) (consensus: 5'-GTGACGT). CREB3 functions as a negative transcriptional regulator in ligand-induced transcriptional activation of the glucocorticoid receptor NR3C1 by recruiting and activating histone deacetylases (HDAC1, HDAC2, and HDAC6). It also decreases the acetylation level of histone H4. However, CREB3 does not promote the chemotactic activity of leukocyte cells. **Microbial Infection:** CREB3 plays a role in human immunodeficiency virus type 1 (HIV-1) virus protein expression. It is also involved in herpes simplex virus-1 (HSV-1) latent infection and reactivation from latency. CREB3 represses the VP16-mediated transactivation of immediate early genes of the HSV-1 virus by sequestering host cell factor-1 HCFC1 in the ER membrane of sensory neurons, thereby preventing the initiation of the replicative cascade leading to latent infection. CREB3 may play a role as a cellular tumor suppressor that is targeted by the hepatitis C virus (HCV) core protein. It activates transcription of genes required for reactivation of the latent HSV-1 virus. Its transcriptional activity is inhibited by CREBZF in a HCFC1-dependent manner, by the viral transactivator protein VP16. CREB3 binds DNA to the cAMP response element (CRE) (consensus: 5'-GTGACGT). Its transcriptional activity is also inhibited by CREBZF in a HCFC1-dependent manner, by the viral transactivator HCV core protein.
Gene References Into Functions
  1. Luman, a ubiquitous, non-canonical unfolded protein response (UPR), is identified as a novel regulator of endoplasmic reticulum stress-induced PRNP expression. PMID: 28205568
  2. In summary, the authors demonstrate that hepatitis C virus infection is associated with an upregulation of ARF4, which promotes hepatitis C virus replication. Upon hepatitis C virus infection, CREB3 was redistributed to the nucleus and activated ARF4 transcription. PMID: 28840565
  3. sLZIP is a novel co-repressor of ERalpha and plays a negative role in ERalpha-mediated cell proliferation in breast cancer. PMID: 28662179
  4. These findings indicate that LZIP is a novel modulator of APOA4 expression and hepatic lipid metabolism. PMID: 28246167
  5. The authors found that the CREB3/Herp pathway limited the increase in cytosolic Ca2+ concentration and apoptosis early in poliovirus infection. This may reduce the extent of poliovirus-induced damage to the central nervous system during poliomyelitis. PMID: 27405867
  6. The essential parts of the Golgi stress response from the perspective of the organelle autoregulation are discussed. The pathways of the mammalian Golgi stress response have been identified, specifically the CREB3 pathway. PMID: 28179603
  7. These results indicate that sLZIP plays a role in expression of c-Jun, and migration and invasion of cervical cancer cells via regulation of MMP-9 transcription. PMID: 24481121
  8. INHA gene expression is upregulated by cAMP via CRE in human trophoblasts, and TFAP2 regulates this expression by interacting with CRE. PMID: 25358080
  9. Findings indicate that sLZIP negatively regulates AR transactivation in androgen-dependent PCa cells and functions as a positive regulator in tumor progression of androgen-independent PCa. sLZIP contributes to the malignant phenotype of PCa. PMID: 24441043
  10. Human sLZIP plays a critical role in the development of atherosclerosis and can be used as a therapeutic target molecule for the treatment of atherosclerosis. PMID: 25077563
  11. A CREB3-ARF4 signalling cascade may be part of a Golgi stress response set in motion by stimuli compromising Golgi capacity. PMID: 24185178
  12. It is proposed that JAB1 is a novel binding partner of Luman, which negatively regulates the activity of Luman by promoting its degradation. PMID: 23583719
  13. GSK3beta was downregulated in all samples, and CREB3 did not show a significant decrease or increase in its mRNA expression. However, the results were significant in mucoepidermoid carcinoma and salivary duct carcinoma. PMID: 23023215
  14. sLZIP plays a critical role in MMP-9 expression and is probably involved in invasion and metastasis of cervical cancer. PMID: 22009750
  15. sLZIP-regulated ARF4 expression in response to phorbol 12-myristate 13-acetate is involved in breast cancer cell migration. PMID: 22004728
  16. These findings suggest that HDAC3 selectively represses CREB3-mediated transcriptional activation and chemotactic signaling in human metastatic breast cancer cells. PMID: 20473547
  17. DC-STAMP interacts with ER-resident transcription factor LUMAN, which becomes activated during DC maturation. PMID: 20546900
  18. sLZIP functions as a negative regulator in glucocorticoid-induced transcriptional activation of GR by recruitment and activation of HDACs. PMID: 19779205
  19. Data show that Luman is processed by regulated intramembrane proteolysis. The site 1 protease (S1P), a Golgi-resident enzyme, may be involved in the processing of Luman. PMID: 12138176
  20. HCF-1 contains an activation domain (HCF-1(AD)) required for maximal transactivation by VP16 and its cellular counterpart LZIP. PMID: 12271126
  21. LZIP binds to CCR1, and the interaction between CCR1 and LZIP participates in regulation of Lkn-1-dependent cell migration without affecting the chemotactic activities of other CC chemokines that bind to CCR1. PMID: 15001559
  22. The host cell factor-binding transcription factor Luman is inhibited by Zhangfei. PMID: 15705566
  23. Results report the identification of Herp, a gene involved in ER stress-associated protein degradation (ERAD), as a direct target of Luman. PMID: 16940180
  24. LZIP functions as a positive regulator in the NF-kappaB activation pathway that is triggered by Lkn-1 without affecting the transcriptional activation of NF-kappaB induced by other CCR1-dependent chemokines. PMID: 17192849
  25. Factor NF-kappaB plays an important role in the regulation of LZIP expression, and LZIP expression regulates the monocyte cell migration induced by Lkn-1. PMID: 17296613
  26. Luman/CREB3 recruitment factor inhibits Luman activation of the unfolded protein response. PMID: 18391022

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Database Links

HGNC: 2347

OMIM: 606443

KEGG: hsa:10488

UniGene: Hs.522110

Protein Families
BZIP family, ATF subfamily
Subcellular Location
[Isoform 1]: Endoplasmic reticulum membrane; Single-pass type II membrane protein. Golgi apparatus.; [Isoform 2]: Nucleus. Cytoplasm.; [Processed cyclic AMP-responsive element-binding protein 3]: Nucleus.; [Isoform 1]: Cytoplasm.
Tissue Specificity
Ubiquitously expressed. Expressed in dendritic cells (DC). Weakly expressed in monocytes (at protein level).

Customer Reviews

Overall Rating 5.0 Out Of 5
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B.A
By Anonymous
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Applications : Immunohistochemistry (IHC) Analysis

Sample type: cells

Review: Immunohistochemical analysis showed that ATF1, CREB1, and CREB3 expression was significantly higher in HCC tissues than in adjacent normal tissues (*p < 0.05; **p < 0.01; ***p < 0.001).

Q&A

What is CREB3 and why is it significant in cellular research?

CREB3 (also known as LZIP and Luman) belongs to the bZIP family and ATF subfamily of transcription factors. It is activated through intramembrane proteolysis (RIP) and binds to cAMP response elements (consensus sequence: 5'-GTGACGT[AG][AG]-3') found in numerous viral and cellular promoters. The protein has significant research importance due to its role in regulated cell death (RCD), ER stress response, and viral pathogenesis. Full-length CREB3 (CREB3-FL) is anchored to the nuclear inner membrane where it interacts with lamins and chromatin DNA, while its cleaved form (CREB3-CF) accumulates in the nucleus following activation . CREB3 requires host cell factor C1 (HCFC1) as a coactivator, and its activity and expression are suppressed when the HCFC1-CREB3 complex binds with CREBZF . Recent research has identified CREB3 as a key regulator of karyoptosis, a unique cell death mechanism characterized by nuclear shrinkage and membrane rupture, suggesting potential applications in cancer therapeutics .

How do I select the appropriate CREB3 antibody for my research?

When selecting a CREB3 antibody, consider these methodological criteria:

  • Target epitope location: Determine whether your research requires detection of full-length CREB3 (CREB3-FL), cleaved CREB3 (CREB3-CF), or both. Some antibodies target the N-terminal domain (aa 1-230), while others target other regions.

  • Application compatibility: Verify the antibody has been validated for your specific application. For example, Proteintech's 11275-1-AP has been validated for Western Blot (WB), Immunohistochemistry (IHC), Immunofluorescence (IF/ICC), Immunoprecipitation (IP), and Chromatin Immunoprecipitation (ChIP) .

  • Species reactivity: Confirm the antibody detects CREB3 in your experimental model. The 11275-1-AP antibody has verified reactivity with human samples and cited reactivity with mouse samples .

  • Validation data: Review published literature that has successfully used the antibody in applications similar to yours. Search for papers that include proper controls such as knockdown/knockout validation .

  • Clonality consideration: Polyclonal antibodies like 11275-1-AP offer high sensitivity but potential batch variation, while monoclonal antibodies provide consistent specificity but potentially lower sensitivity.

Always perform preliminary validation experiments with appropriate positive and negative controls before proceeding with critical experiments.

What is the molecular weight range for detecting CREB3 in Western blot applications?

When detecting CREB3 via Western blot, expect to observe bands within the range of 40-64 kDa, although the calculated molecular weight is 44 kDa . This variation occurs due to:

  • Post-translational modifications: CREB3 undergoes N-glycosylation and proteolytic processing, resulting in altered migration patterns .

  • Isoform detection: Up to two different isoforms have been reported for CREB3, including the alternative splicing product sLZIP (CREB3-dTM) which lacks the transmembrane domain .

  • Tissue-specific processing: The observed molecular weight may vary depending on the cell/tissue type due to differential processing of the protein.

For optimal detection, use a gradient gel (4-20%) with a broad molecular weight marker and include positive control lysates from cells known to express CREB3, such as Jurkat or HeLa cells . When troubleshooting inconsistent molecular weights, consider using denaturing agents like urea to address potential protein aggregation, or phosphatase inhibitors to preserve phosphorylated forms.

What are the recommended protocols for detecting CREB3 by Western blot?

For optimal Western blot detection of CREB3, follow this methodological approach:

Sample preparation:

  • Lyse cells in RIPA buffer supplemented with protease inhibitors and phosphatase inhibitors

  • Include detergents suitable for membrane proteins since CREB3 localizes to the ER and nuclear membrane

  • Sonicate briefly to shear DNA and reduce sample viscosity

SDS-PAGE and transfer:

  • Load 20-40 μg of protein per lane

  • Use 10-12% polyacrylamide gels to resolve proteins in the 40-64 kDa range

  • Transfer to PVDF membrane at 100V for 60-90 minutes in cold transfer buffer with 10-20% methanol

Antibody incubation:

  • Block membrane with 5% non-fat milk in TBST for 1 hour at room temperature

  • Incubate with primary CREB3 antibody (e.g., Proteintech 11275-1-AP) at dilution 1:500-1:1000 overnight at 4°C

  • Wash 3× with TBST, 5 minutes each

  • Incubate with HRP-conjugated secondary antibody at 1:5000 for 1 hour at room temperature

  • Wash 3× with TBST, 5 minutes each

Detection:

  • Apply chemiluminescent substrate (e.g., SuperSignal West Pico)

  • Image using a digital imager system like ImageQuant LAS 4000

  • Use GAPDH (ProteinTech 10494-1-AP) as loading control

Troubleshooting tips:

  • If detecting multiple bands, confirm specificity with CREB3 knockdown controls

  • For weak signals, extend primary antibody incubation time or increase concentration

  • To distinguish between CREB3-FL and CREB3-CF, compare samples with and without ER stress induction

How should I optimize immunofluorescence protocols for CREB3 subcellular localization studies?

For high-quality CREB3 immunofluorescence that accurately reveals subcellular localization:

Cell preparation:

  • Culture cells on glass coverslips or chamber slides

  • Consider using cell lines with confirmed CREB3 expression (e.g., U2OS, HeLa, Jurkat)

  • Include experimental conditions that modify CREB3 localization (e.g., ER stress inducers like thapsigargin or tunicamycin)

Fixation and permeabilization:

  • Fix cells with 4% paraformaldehyde for 15 minutes at room temperature

  • Permeabilize with 0.5% Triton X-100 in PBS for 10 minutes

  • Block with PBS containing 0.02% Tween-20 and 1% BSA for 1 hour at 37°C

Antibody incubation:

  • Dilute primary CREB3 antibody (e.g., 11275-1-AP) 1:200-1:800 in blocking buffer

  • Incubate overnight at 4°C in a humidified chamber

  • Wash 3× with PBS-T

  • Incubate with fluorophore-conjugated secondary antibody for 1 hour at room temperature

  • Wash 3× with PBS-T

  • Counterstain nuclei with DAPI

Co-localization studies:

  • For ER/Golgi localization: Co-stain with organelle markers (e.g., calnexin for ER, GM130 for Golgi)

  • For nuclear membrane studies: Co-stain with nuclear lamin proteins (mCherry-Lamin A or mCherry-Lamin B1)

  • Use confocal microscopy for accurate subcellular localization

Advanced analysis:

  • Perform time-lapse imaging to track CREB3 translocation under stress conditions

  • Consider using super-resolution microscopy for detailed localization at the nuclear membrane

  • Quantify nuclear/cytoplasmic ratios to measure CREB3 activation

What are effective approaches for studying CREB3 in the context of regulated cell death?

To investigate CREB3's role in regulated cell death, particularly karyoptosis:

Experimental design strategies:

  • Overexpression systems:

    • Transfect cells with plasmids encoding CREB3-FL and CREB3-CF to compare effects

    • Use increasing concentrations (0.5-2 μg) of CREB3 plasmid to establish dose-response relationships

    • Include mutant constructs to identify functional domains critical for cell death induction

  • Knockdown/knockout approaches:

    • Implement siRNA or CRISPR-Cas9 to deplete CREB3

    • Validate knockdown efficiency by Western blot

    • Assess impact on cell viability under normal and stress conditions

  • Stress induction methods:

    • Apply ER stress inducers (thapsigargin, tunicamycin)

    • Use UVB irradiation to trigger DNA damage response

    • Test viral infection (e.g., HSV-1) to evaluate CREB3's role in infection-associated cell death

Cell death analysis techniques:

  • Morphological assessment:

    • Monitor nuclear morphology by live-cell imaging with nuclear dyes

    • Quantify nuclear shrinkage, deformation, and membrane rupture

    • Use fluorescent reporters like mCherry-EGFP-LC3B to distinguish from autophagy

  • Molecular markers:

    • Assess DNA fragmentation via TUNEL assay

    • Measure caspase activation to differentiate from apoptosis

    • Evaluate nuclear membrane integrity using lamin staining

  • Mechanistic investigation:

    • Analyze CREB3 cleavage patterns under different death-inducing conditions

    • Identify protein interactions using co-immunoprecipitation with CREB3 antibodies

    • Perform chromatin immunoprecipitation (ChIP) to determine transcriptional targets during cell death

How can CREB3 antibodies be used to investigate ER stress responses?

CREB3 functions as a sensor and mediator of ER stress responses. Here's a methodological framework for using CREB3 antibodies in ER stress research:

Experimental system setup:

  • Stress induction protocols:

    • Chemical inducers: thapsigargin (1 μM, 0.5-24h), tunicamycin (1-5 μg/ml, 0.5-24h), DTT (1-2 mM, 0.5-4h)

    • Physiological stressors: glucose deprivation, hypoxia, viral infection

    • Include time course experiments to capture transient responses

  • Cell systems:

    • Compare normal cells vs. cancer cells with altered ER stress responses

    • Include cells with genetic modifications in key UPR components (e.g., PERK, IRE1α)

    • Test cells expressing CREB3-FL, CREB3-CF, or CREB3-dTM variants

Analytical approaches:

  • Protease-dependent activation:

    • Monitor CREB3 cleavage by Western blot using antibodies that distinguish CREB3-FL (40-64 kDa) and CREB3-CF

    • Compare with other UPR markers like GRP78 (BiP)

    • Use protease inhibitors to block specific processing steps

  • Subcellular trafficking:

    • Perform subcellular fractionation followed by Western blot

    • Use immunofluorescence to track CREB3 movement from ER to nucleus

    • Employ live-cell imaging with fluorescently tagged CREB3

  • Transcriptional activity:

    • Perform ChIP with CREB3 antibodies to identify direct target genes

    • Analyze binding to CRE elements (5′-GTGACGT[AG][AG]-3′)

    • Compare transcriptional profiles before and after ER stress induction

Validation approaches:

  • Use CREB3 knockdown/knockout cells as negative controls

  • Include HCFC1 and CREBZF analysis to assess cofactor relationships

  • Compare results with other UPR branches (PERK, IRE1α, ATF6) to determine pathway specificity

What methods should I use to study the interaction between CREB3 and nuclear membrane components?

To investigate CREB3 interactions with nuclear membrane components:

Co-immunoprecipitation approaches:

  • Standard co-IP:

    • Lyse cells in non-denaturing buffer containing 0.5-1% NP-40 or Triton X-100

    • Pre-clear lysate with protein A/G beads

    • Immunoprecipitate with CREB3 antibody (e.g., Proteintech 11275-1-AP)

    • Detect interacting partners (lamins, chromatin components) by Western blot

  • Crosslinking IP:

    • Treat cells with membrane-permeable crosslinkers (DSP, formaldehyde)

    • Perform IP with CREB3 antibody

    • Reverse crosslinks and analyze by mass spectrometry to identify novel interactions

  • Proximity labeling:

    • Express CREB3 fused to BioID or APEX2

    • Allow biotinylation of proximal proteins

    • Purify biotinylated proteins and identify by mass spectrometry

Microscopy-based methods:

  • Co-localization analysis:

    • Perform dual immunofluorescence with CREB3 antibody and nuclear membrane markers

    • Use markers for nuclear lamina (Lamin A, Lamin B1)

    • Analyze with confocal microscopy and calculate Pearson's correlation coefficients

  • FRET/FLIM analysis:

    • Express CREB3 and interacting partners with appropriate fluorophore pairs

    • Measure FRET efficiency to quantify direct interactions

    • Use acceptor photobleaching to confirm specific interactions

  • Super-resolution microscopy:

    • Apply STORM or PALM techniques for nanoscale resolution of interactions

    • Perform quantitative analysis of clustering at the nuclear membrane

Functional validation approaches:

  • Generate truncated CREB3 constructs to map interaction domains

  • Create site-directed mutants to disrupt specific interactions

  • Assess functional consequences of disrupted interactions on nuclear membrane integrity and karyoptosis

How can I differentiate between CREB3-mediated karyoptosis and other forms of cell death?

Distinguishing CREB3-mediated karyoptosis from other cell death mechanisms requires a multi-parameter approach:

Morphological characterization:

  • Nuclear morphology assessment:

    • Live-cell imaging with nuclear dyes (Hoechst, DRAQ5)

    • Quantify nuclear shrinkage, deformation, and loss of nuclear components

    • Track nuclear membrane integrity using fluorescent nuclear membrane markers

  • Differential markers:

    • Apoptosis: Monitor membrane blebbing, apoptotic bodies, chromatin condensation

    • Necrosis: Assess cell swelling, plasma membrane rupture

    • Autophagy: Evaluate autophagosome formation with LC3B markers (mCherry-EGFP-LC3B)

    • Pyroptosis: Look for cell swelling and inflammasome activation

Molecular signature analysis:

  • Pathway-specific markers:

    Cell Death TypeKey MarkersCREB3-Karyoptosis Differences
    ApoptosisCaspase-3/7 activation, PARP cleavageCaspase-independent, distinct nuclear morphology
    NecroptosisRIPK1/RIPK3/MLKL phosphorylationNo MLKL involvement, nuclear-focused
    AutophagyLC3-II conversion, p62 degradationNo characteristic autophagosome formation
    PyroptosisGasdermin D cleavage, IL-1β releaseNo inflammatory component
    KaryoptosisCREB3-CF accumulation, nuclear membrane ruptureDistinct nuclear morphology with preserved cytoplasm
  • Inhibitor profiling:

    • Test caspase inhibitors (z-VAD-fmk), necroptosis inhibitors (Necrostatin-1), and autophagy inhibitors (3-MA)

    • Determine if CREB3-mediated death persists despite these inhibitors

    • Use protease inhibitors to block CREB3 cleavage and assess effects on cell death

Genetic manipulation approaches:

  • Compare outcomes in cells with:

    • CREB3 overexpression (FL vs. CF vs. dTM variants)

    • CREB3 knockdown/knockout

    • Mutations in key death pathway components (caspases, RIPK1/3, etc.)

  • Evaluate transcriptional responses:

    • Perform ChIP-seq to identify CREB3-CF binding sites during karyoptosis

    • Compare gene expression profiles between karyoptosis and other death modes

    • Look for enrichment of DNA damage response genes similar to UVB irradiation

How do I troubleshoot inconsistent results with CREB3 antibodies in Western blot applications?

When facing inconsistent CREB3 detection in Western blots, implement this systematic troubleshooting approach:

Sample preparation issues:

  • Protein degradation:

    • Include fresh protease inhibitors in lysis buffer

    • Maintain samples at 4°C during processing

    • Add phosphatase inhibitors to preserve post-translational modifications

  • Extraction efficiency:

    • For membrane-bound CREB3-FL, use stronger detergents (1% SDS, 1% Triton X-100)

    • Sonicate samples briefly to enhance solubilization

    • For nuclear CREB3-CF, include nuclear extraction steps

Detection challenges:

  • Variable band patterns:

    • Expected MW range is 40-64 kDa; multiple bands may represent different forms

    • Compare with positive controls (Jurkat or HeLa cell lysates)

    • Use gradient gels (4-20%) to better resolve multiple species

  • Weak signal:

    • Increase antibody concentration (up to 1:500 dilution)

    • Extend primary antibody incubation time (overnight at 4°C)

    • Use enhanced chemiluminescence substrate or switch to fluorescent detection

  • High background:

    • Increase blocking time (2 hours at room temperature)

    • Add 0.1% Tween-20 to antibody dilution buffers

    • Try alternative blocking agents (5% BSA instead of milk)

Validation approaches:

  • Control experiments:

    Control TypePurposeImplementation
    Positive controlConfirm antibody functionalityInclude lysates from cells known to express CREB3 (Jurkat, HeLa)
    Negative controlVerify specificityUse CREB3 knockdown/knockout samples
    Loading controlEnsure equal loadingProbe for housekeeping proteins (GAPDH)
    Treatment controlDistinguish CREB3 formsCompare untreated vs. ER stress-induced samples
  • Alternative antibody validation:

    • Test a different CREB3 antibody recognizing a distinct epitope

    • Consider using epitope-tagged CREB3 constructs with tag-specific antibodies

    • Verify CREB3 expression at the mRNA level by RT-PCR

What are the critical parameters for optimizing CREB3 antibody performance in ChIP experiments?

For successful Chromatin Immunoprecipitation (ChIP) with CREB3 antibodies:

Chromatin preparation optimization:

  • Crosslinking parameters:

    • Use 1% formaldehyde for 10 minutes at room temperature

    • For transient interactions, try dual crosslinking with DSG followed by formaldehyde

    • Quench with 125 mM glycine for 5 minutes

  • Sonication conditions:

    • Optimize sonication to achieve 200-500 bp fragments

    • Verify fragment size by agarose gel electrophoresis

    • Include spike-in controls to normalize for sonication efficiency

Immunoprecipitation optimization:

  • Antibody selection:

    • Choose ChIP-validated CREB3 antibodies

    • Consider whether to target CREB3-FL, CREB3-CF, or both

    • Perform preliminary IP validation with Western blot

  • IP protocol parameters:

    • Pre-clear chromatin with protein A/G beads

    • Use 3-5 μg antibody per ChIP reaction

    • Incubate overnight at 4°C with rotation

    • Include negative control IgG and positive control antibody (e.g., anti-Histone H3)

  • Washing stringency:

    • Test different wash buffer compositions (varying salt and detergent concentrations)

    • Perform at least 4-5 washes to reduce background

    • Include a final wash in TE buffer

PCR and analysis optimization:

  • Primer design for CREB3 targets:

    • Design primers flanking known or predicted CRE elements (5'-GTGACGT[AG][AG]-3')

    • Include primers for positive control loci (known CREB3 targets)

    • Include primers for negative control regions (gene deserts)

  • Data analysis approaches:

    • Use percent input or fold enrichment over IgG for quantification

    • Compare CREB3 binding under normal vs. stress conditions

    • Validate findings with reporter assays for functional significance

Advanced ChIP applications:

  • ChIP-seq considerations:

    • Increase starting material (10-20 million cells)

    • Include input controls and spike-in for normalization

    • Use bioinformatics to identify enriched motifs matching CRE consensus sequences

  • Sequential ChIP (Re-ChIP):

    • First IP with CREB3 antibody

    • Second IP with antibodies against cofactors (HCFC1)

    • Map co-binding of transcription factor complexes

How can I integrate CREB3 antibody-based studies with functional assays to comprehensively assess CREB3's role in disease models?

A comprehensive assessment of CREB3's role in disease requires integrating antibody-based detection with functional assays:

Experimental design framework:

  • Expression profiling:

    • Quantify CREB3 levels in disease vs. normal tissues/cells by immunoblotting

    • Determine CREB3 cleavage status and subcellular localization by IF/IHC

    • Correlate expression with disease parameters and patient outcomes

  • Functional manipulation:

    • Generate stable cell lines with CREB3 overexpression, knockdown, or knockout

    • Create disease-relevant mutations based on literature findings

    • Compare wild-type vs. mutant CREB3 for functional differences

Integrated analytical approaches:

  • For viral infection studies:

    • Assess CREB3 expression changes during infection using Western blot

    • Measure viral release via plaque assays in CREB3-modulated cells

    • Perform immunofluorescence to track CREB3 and viral protein co-localization

    • Use slot blot analysis to detect CREB3 in released viral particles

  • For cancer research applications:

    • Combine CREB3 immunostaining with proliferation markers (Ki-67)

    • Assess CREB3-mediated karyoptosis induction in therapy-resistant cells

    • Correlate CREB3 cleavage with DNA damage response using γH2AX co-staining

    • Measure senescence markers (SA-β-gal) in cells with CREB3-CF expression

  • For ER stress pathway analysis:

    • Correlate CREB3 cleavage with other UPR markers (GRP78, XBP1s)

    • Perform chromatin immunoprecipitation to identify direct CREB3 targets during stress

    • Use luciferase reporters with CRE elements to measure CREB3 transcriptional activity

Multi-omics integration:

  • Data integration strategies:

    ApproachMethodologyIntegration with Antibody Data
    TranscriptomicsRNA-seq of CREB3-modulated cellsCorrelate with ChIP-seq using CREB3 antibodies
    ProteomicsMass spectrometry of CREB3 interactomeValidate interactions by co-IP with CREB3 antibodies
    Phenotypic assaysCell viability, migration, invasionCorrelate phenotypes with CREB3 expression/cleavage patterns
  • Validation in disease models:

    • Translate in vitro findings to animal models using tissue IHC with CREB3 antibodies

    • Analyze patient samples for CREB3 expression/cleavage patterns

    • Correlate antibody-based measurements with disease outcomes and treatment responses

How can CREB3 antibodies be used to investigate the role of this protein in viral pathogenesis?

CREB3 plays a significant role in viral infection processes, and antibodies can be instrumental in elucidating these mechanisms:

Experimental approaches for virus-host interactions:

  • Infection time course analysis:

    • Infect cells with viruses (e.g., HSV-1)

    • Collect samples at various time points post-infection

    • Perform Western blotting for CREB3-FL and CREB3-CF to track processing

    • Correlate with viral protein expression (e.g., VP16, gB)

  • Subcellular trafficking studies:

    • Use immunofluorescence to track CREB3 location during infection

    • Co-stain for viral proteins to identify co-localization

    • Perform live-cell imaging with fluorescently tagged CREB3

Functional investigation methods:

  • Viral egress analysis:

    • Transfect cells with CREB3 plasmid at various concentrations (0.5-2 μg)

    • Infect with virus (e.g., HSV-1)

    • Collect supernatants for plaque assays to quantify viral release

    • Perform Western blotting to confirm CREB3 expression levels

  • Mechanistic pathway analysis:

    • Investigate CREB3-HPSE (heparanase) interaction in viral release

    • Analyze syndecan-1 shedding using slot blot techniques

    • Assess involvement of ER stress response during infection

Advanced applications:

  • Host-range determinant studies:

    • Compare CREB3 processing across cell types with different viral susceptibility

    • Use species-specific CREB3 antibodies to evaluate virus compatibility with host factors

    • Investigate viral proteins that modulate CREB3 activation

  • Therapeutic targeting assessment:

    • Test compounds that inhibit CREB3 processing

    • Evaluate effects on viral replication and release

    • Use CREB3 antibodies to monitor target engagement

What are the most promising approaches for studying CREB3's potential as a therapeutic target in cancer research?

CREB3's role in karyoptosis presents opportunities for cancer therapeutic development, which can be explored using antibody-based methods:

Target validation strategies:

  • Expression analysis in cancer tissues:

    • Compare CREB3 expression and processing between tumor and normal tissues

    • Perform immunohistochemistry with CREB3 antibodies on tissue microarrays

    • Correlate CREB3 status with patient outcomes and treatment responses

  • Functional characterization in cancer models:

    • Overexpress CREB3-FL or CREB3-CF in cancer cell lines

    • Monitor effects on proliferation, invasion, and therapy resistance

    • Determine if CREB3-induced karyoptosis bypasses apoptosis resistance mechanisms

Therapeutic development approaches:

  • Drug screening platforms:

    • Develop cell-based assays monitoring CREB3 cleavage

    • Screen compound libraries for modulators of CREB3 processing

    • Use Western blotting with CREB3 antibodies to validate hits

  • Combination therapy assessment:

    • Test CREB3 pathway modulators with conventional chemotherapeutics

    • Evaluate synergy with ER stress inducers

    • Monitor CREB3 processing and nuclear accumulation as pharmacodynamic markers

Mechanistic investigation methods:

  • DNA damage response connection:

    • Compare proteomic profiles between CREB3-CF overexpression and UVB irradiation

    • Investigate shared signaling pathways using phospho-specific antibodies

    • Perform ChIP-seq to identify CREB3 targets involved in DNA damage response

  • Cellular senescence induction:

    • Analyze senescence markers in CREB3-CF expressing cells

    • Investigate the relationship between karyoptosis and senescence

    • Use antibodies to detect senescence-associated secretory phenotype (SASP) factors

How can multi-omics approaches be integrated with CREB3 antibody applications for comprehensive pathway analysis?

Integrating CREB3 antibody applications with multi-omics approaches enables comprehensive pathway analysis:

Integrated analytical framework:

  • ChIP-seq and transcriptomics integration:

    • Perform ChIP-seq with CREB3 antibodies to identify genome-wide binding sites

    • Conduct RNA-seq under normal and stress conditions

    • Integrate datasets to identify direct CREB3 transcriptional targets

    • Validate key targets with ChIP-qPCR and RT-qPCR

  • Proteomics and interactomics:

    • Immunoprecipitate CREB3 using validated antibodies

    • Identify interacting partners by mass spectrometry

    • Compare interactome under normal vs. stress conditions

    • Validate key interactions with co-IP and Western blotting

Pathway analysis approaches:

  • Signaling network reconstruction:

    Omics LayerCREB3 Antibody ApplicationIntegration Method
    TranscriptomicsChIP-seq for binding sitesCorrelate binding with expression changes
    ProteomicsIP-MS for interactomeMap protein-protein interaction networks
    PhosphoproteomicsPhospho-specific antibodiesConnect kinase pathways to CREB3 activation
    EpigenomicsChIP-seq for histone marksCorrelate chromatin state with CREB3 binding
  • Cellular response mapping:

    • Analyze temporal dynamics of CREB3 processing during stress responses

    • Correlate with global changes in transcriptome and proteome

    • Identify feedback mechanisms and regulatory circuits

Advanced computational approaches:

  • Network modeling:

    • Use antibody-derived data as anchor points for network construction

    • Model CREB3 pathway activation dynamics

    • Predict potential therapeutic intervention points

  • Multi-scale integration:

    • Connect molecular findings to cellular phenotypes

    • Map pathway alterations to disease progression

    • Integrate patient-derived data with experimental models

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