Acetyl-KRT8 (K483) Antibody

What is Acetyl-KRT8 (K483) Antibody and what are its primary research applications?

Acetyl-KRT8 (K483) Antibody is a rabbit polyclonal antibody that specifically detects Keratin 8 (KRT8) protein when acetylated at lysine 483. The antibody is primarily used for Western Blot (WB) and ELISA applications in research settings .

The antibody is designed to recognize a specific post-translational modification of KRT8, which is important for studying how acetylation affects KRT8 function in various cellular processes. Typical research applications include:

• Western blotting (WB): Used at dilutions of 1:500-1:2000

• ELISA: Used at dilutions up to 1:20000

• Immunohistochemistry (IHC): Used in some research applications

It's important to note that this antibody specifically recognizes the acetylated form at K483, not the total KRT8 protein, making it valuable for studying this specific post-translational modification .

How should researchers optimize Western Blot protocols when working with Acetyl-KRT8 (K483) Antibody?

When optimizing Western Blot protocols for Acetyl-KRT8 (K483) Antibody, researchers should consider the following methodological approach:

• Sample preparation:

  • Use appropriate cell lines known to express KRT8 (e.g., A549, HeLa, MCF-7)

  • Consider treatments that may affect acetylation status, such as histone deacetylase inhibitors

• Protocol optimization:

  • Start with recommended dilution range (1:500-1:2000) and adjust as needed

  • Use appropriate blocking buffer (5% BSA in TBST is often effective)

  • Consider extended primary antibody incubation (overnight at 4°C)

• Controls to include:

  • Positive control: A549 cells (shown to express acetylated KRT8)

  • Negative control: Lysates treated with deacetylases

  • Loading control: Beta-actin or GAPDH

• Detection optimization:

  • Use HRP-conjugated anti-rabbit secondary antibody at appropriate dilution

  • Expected molecular weight: ~52-54 kDa

  • Enhanced chemiluminescence (ECL) detection is recommended

Western blots using this antibody have successfully detected endogenous levels of Acetyl-KRT8 (K483) in various cell lines, with optimal results often requiring careful optimization of blocking conditions and antibody concentrations .

How can researchers effectively study the role of KRT8 acetylation in mitochondrial dynamics using this antibody?

Studying KRT8 acetylation in mitochondrial dynamics requires a multi-faceted experimental approach:

• Baseline assessment of acetylation status:

  • Use Acetyl-KRT8 (K483) Antibody in Western blotting (1:500-1:2000 dilution) to establish baseline acetylation in your model system

  • Compare with total KRT8 levels using a pan-KRT8 antibody

• Induction of mitochondrial stress:

  • Treat cells with oxidative stress inducers like paraquat (400 μM for 24h has been established in literature)

  • Track changes in KRT8 acetylation status before and after treatment

• Mitochondrial function assessment:

  • Measure oxygen consumption rate (OCR) in cells with different KRT8 expression/acetylation levels

  • Use MitoTracker Red and Green double staining to assess mitochondrial membrane potential

  • Quantify ROS generation using MitoSOX

• Mitochondrial morphology analysis:

  • Employ confocal microscopy with MitoTracker staining to analyze mitochondrial shape changes

  • Co-localize with GFP-tagged KRT8 to study fission events

  • Use transmission electron microscopy to assess detailed mitochondrial structure

Research has shown that KRT8 facilitates mitochondrial fission and protects against necrotic cell death under oxidative stress conditions . When monitoring mitochondrial fission, KRT8 has been observed at fission sites, suggesting a direct role in this process. Studies have demonstrated that KRT8 overexpression leads to extensive mitochondrial fragmentation under oxidative stress, while KRT8 knockdown results in enlarged, swollen mitochondria with disrupted cristae .

What controls should be included when studying KRT8 acetylation in autophagy-related research?

When investigating KRT8 acetylation in autophagy research, researchers should implement the following controls:

• Essential controls for acetylation status:

  • Positive acetylation control: Cells treated with deacetylase inhibitors (e.g., trichostatin A)

  • Negative acetylation control: Cells expressing K483R mutant KRT8 (acetylation-deficient)

  • Acetylation comparison: Use both Acetyl-KRT8 (K483) and pan-KRT8 antibodies on parallel samples

• Autophagy pathway controls:

  • Autophagy induction control: Cells under starvation conditions (EBSS medium)

  • Autophagy inhibition controls:

    • Early inhibition: 3-methyladenine (3-MA) treatment

    • Late inhibition: Bafilomycin A1 or Chloroquine

  • Autophagy flux markers: LC3-II and SQSTM1/p62 levels

• KRT8 manipulation controls:

  • KRT8 knockdown: siRNA targeting KRT8

  • KRT8 overexpression: Wild-type KRT8 expression

  • Non-targeting siRNA or empty vector controls

• Microscopy controls for co-localization studies:

  • Single-stained controls for each fluorophore

  • Secondary antibody-only controls

  • Co-localization with established autophagy markers (LC3B, LAMP1/2)

Research has shown that KRT8 expression is enhanced concomitantly with autophagy progression, as indicated by SQSTM1 degradation and LC3B conversion under oxidative stress conditions . When cells were treated with autophagy inhibitor 3-MA, a decrease in KRT8 expression was observed. Furthermore, KRT8 knockdown experiments resulted in decreased LC3B-II/I ratio and increased SQSTM1 accumulation, suggesting impaired autophagy . Electron microscopy studies also revealed that KRT8 facilitates autophagosome clearance by enhancing fusion between autophagosomes and lysosomes .

How can Acetyl-KRT8 (K483) Antibody be used to study the Krt8+ transitional stem cell state in lung injury and regeneration models?

The Acetyl-KRT8 (K483) Antibody can be strategically employed to investigate the Krt8+ transitional stem cell state through the following methodological approaches:

• Temporal profiling of KRT8 acetylation during regeneration:

  • Collect lung tissue samples at multiple timepoints following injury (days 2, 7, 10, 14, 21, 36, 54 post-injury have been established as informative timepoints)

  • Process for Western blot analysis using Acetyl-KRT8 (K483) Antibody (1:500-1:2000) and total KRT8 antibody

  • Quantify the ratio of acetylated to total KRT8 at each timepoint

• Single-cell analysis correlation:

  • Perform single-cell RNA-seq on EpCam+ sorted cells from injured lungs

  • Correlate KRT8 gene expression with acetylation status using flow cytometry or imaging mass cytometry

  • Identify gene signatures associated with differential KRT8 acetylation

• Lineage tracing combined with acetylation status:

  • Implement genetic lineage tracing (e.g., SftpcCreERT2 or ScgbCreERT2)

  • Perform immunofluorescence co-staining with Acetyl-KRT8 (K483) Antibody

  • Track acetylation status during transition from alveolar/airway stem cells to Krt8+ state

• Pathway analysis in relation to acetylation:

  • Assess correlation between acetylation status and activation of key pathways:

    • p53 pathway

    • NFkB signaling

    • Cellular senescence markers

    • EMT-related gene expression

Research has demonstrated that Krt8+ alveolar differentiation intermediate (ADI) cells represent a unique regenerative cell state that appears during lung injury and repair. These cells show high expression of Krt8 with peak expression around days 10-14 post-injury . They exhibit squamous morphology, display transcriptional features of cellular senescence, and show activation of p53 and NFkB pathways . Importantly, these Krt8+ cells form a distinct communication network with mesenchyme and macrophages during repair, creating specific receptor-ligand pairs, such as expressing endothelin-1 (Edn1) that binds to endothelin-receptor (Ednrb) on capillary endothelial cells .

What methodological approaches can resolve contradictory data regarding KRT8 acetylation versus phosphorylation in cellular stress responses?

When faced with contradictory data regarding KRT8 post-translational modifications, researchers should implement the following methodological approaches:

• Sequential immunoprecipitation strategy:

  • First IP: Use Acetyl-KRT8 (K483) Antibody to isolate acetylated KRT8

  • Western blot analysis: Probe with phospho-specific KRT8 antibodies

  • Reverse approach: IP with phospho-specific antibodies, then detect with Acetyl-KRT8 (K483)

  • Quantify relative abundance of singly-modified versus doubly-modified KRT8

• Mass spectrometry-based validation:

  • Perform IP with either Acetyl-KRT8 (K483) or total KRT8 antibodies

  • Conduct LC-MS/MS analysis to identify all post-translational modifications

  • Quantify stoichiometry of different modifications

  • Map temporal dynamics of modifications under stress conditions

• Site-directed mutagenesis experiments:

  • Generate KRT8 mutants: K483R (acetylation-deficient) and relevant phosphorylation site mutants

  • Express in KRT8-knockout cells and analyze phenotypes

  • Assess how one modification affects the occurrence of others

  • Evaluate functional consequences of each modification

• Time-course analysis of modifications:

  • Subject cells to oxidative stress (e.g., paraquat treatment)

  • Collect samples at multiple timepoints (0, 1, 3, 6, 12, 24, 36, 48 hours)

  • Quantify acetylation and phosphorylation levels at each timepoint

  • Determine the sequence of modification events

Research has shown that under oxidative stress, both KRT8 and its phosphorylated form (p-KRT8) are enhanced in a manner dependent on stress intensity and duration . Interestingly, when cells were treated with paraquat (400 μM) for 24 hours, expression of both KRT8 and its phosphorylated form was enhanced without altering the p-KRT8:total KRT8 ratio . Additional studies have suggested that the association between PLEC-anchoring mitochondria and KRT8 was diminished by KRT8 phosphorylation under oxidative stress , indicating a potential regulatory relationship between different post-translational modifications.

How should researchers interpret changes in KRT8 acetylation patterns in the context of mitochondrial dysfunction studies?

Interpreting KRT8 acetylation changes in mitochondrial dysfunction studies requires systematic analytical approaches:

• Quantitative analysis framework:

  • Calculate the ratio of acetylated KRT8 to total KRT8 across conditions

  • Normalize to appropriate housekeeping proteins

  • Perform statistical analysis (e.g., ANOVA with post-hoc tests) to determine significance

  • Consider using the following interpretation framework:

  Acetyl-KRT8:Total KRT8 Ratio	Mitochondrial Morphology	Mitochondrial Function	Interpretation
  Increased	Fragmented	Maintained OCR	Protective response
  Increased	Swollen	Decreased OCR	Failed protective response
  Decreased	Swollen	Severely decreased OCR	Compromised mitophagy
  No change	Elongated/Normal	Normal OCR	Homeostatic state

• Correlation with functional parameters:

  • Analyze relationship between acetylation levels and:

    • Oxygen consumption rate (OCR)

    • Mitochondrial membrane potential

    • ROS generation

    • Cell death (apoptosis vs. necrosis)

  • Use regression analysis to establish quantitative relationships

• Context-dependent interpretation:

  • Cell type specificity: Different cell types may show different baseline and stress-induced acetylation patterns

  • Stress type specificity: Oxidative, ER, and metabolic stress may induce different patterns

  • Duration effects: Acute vs. chronic stress responses may differ significantly

• Pathway integration analysis:

  • Consider KRT8 acetylation in relation to:

    • Mitochondrial dynamics proteins (MFF, DNM1L)

    • Autophagy/mitophagy markers

    • ER stress indicators (DDIT3, p-GCN1)

    • Calcium signaling

Research has demonstrated that KRT8 plays a critical role in protecting against mitochondrial dysfunction and cell death under oxidative stress. In KRT8-overexpressing cells, paraquat-induced mitochondrial ROS generation was significantly reduced compared to control cells . Furthermore, while control and KRT8-knockdown cells showed enlarged, swollen mitochondria with destroyed cristae under oxidative stress, KRT8-overexpressing cells exhibited extensive mitochondrial fragmentation . Functionally, oxygen consumption rate remained at approximately 90% in KRT8-overexpressing cells under oxidative stress, while it decreased to approximately 50% in control cells and even further in KRT8-knockdown cells .

What potential pitfalls should researchers be aware of when using Acetyl-KRT8 (K483) Antibody in studies involving post-translational modification crosstalk?

Researchers should be vigilant about the following methodological pitfalls when studying post-translational modification crosstalk with Acetyl-KRT8 (K483) Antibody:

• Epitope masking and antibody access issues:

  • Problem: Nearby modifications may affect antibody binding to the K483 acetylation site

  • Solution strategies:

    • Use alternative sample preparation methods (native vs. denaturing)

    • Compare results with mass spectrometry-based detection

    • Validate with complementary antibodies targeting different epitopes

• Modification stability challenges:

  • Problem: Acetylation is dynamic and can be lost during sample processing

  • Solution strategies:

    • Include deacetylase inhibitors in all buffers (e.g., nicotinamide, trichostatin A)

    • Process samples rapidly and maintain cold temperatures

    • Consider using acetylation-mimicking mutants (e.g., K483Q) as controls

• Quantification accuracy issues:

  • Problem: Western blot signals may not be linear across the entire dynamic range

  • Solution strategies:

    • Create standard curves with recombinant acetylated KRT8

    • Use multiple exposure times to ensure linearity

    • Consider alternative quantitative methods (ELISA, capillary Western)

    • Use appropriate statistical methods for non-linear data

• Context-dependent modification patterns:

  • Problem: Acetylation patterns may vary with cell type, stress conditions, and time

  • Solution strategies:

    • Include comprehensive time-course experiments

    • Test multiple cell types relevant to research question

    • Validate findings in physiologically relevant models

    • Consider single-cell analysis techniques

How can researchers effectively use Acetyl-KRT8 (K483) Antibody to investigate the role of KRT8 acetylation in cellular senescence and regenerative medicine?

To investigate KRT8 acetylation in cellular senescence and regenerative medicine contexts, researchers should employ the following methodological framework:

• Senescence model characterization:

  • Establish senescence models using:

    • Replicative senescence (serial passaging)

    • Stress-induced senescence (H₂O₂, irradiation)

    • Oncogene-induced senescence (Ras, Raf)

  • Verify senescence markers (SA-β-gal, p16, p21, SASP factors)

  • Quantify acetylated KRT8 levels across models using Western blot (1:500-1:2000 dilution)

• Multi-dimensional analysis of KRT8 in senescence:

  • Perform co-immunoprecipitation to identify acetylated KRT8 binding partners

  • Conduct immunofluorescence to assess subcellular localization changes during senescence

  • Use cell fractionation to quantify cytoskeletal vs. soluble acetylated KRT8

  • Implement ChIP-seq to identify potential impact on chromatin organization

• Regenerative potential assessment:

  • In tissue regeneration models, track acetylated KRT8 in:

    • Stem/progenitor cells (using co-markers)

    • Transitional states (as identified in lung regeneration)

    • Terminally differentiated cells

  • Correlate acetylation status with regenerative capacity

• Functional manipulation strategies:

  • Use CRISPR/Cas9 to generate K483R (non-acetylatable) and K483Q (acetylation-mimetic) mutations

  • Assess impact on:

    • Senescence markers

    • SASP secretion

    • Regenerative capacity

    • Cell-cell communication networks

Research has identified that Krt8+ transitional stem cells display transcriptional features of cellular senescence during regeneration following lung injury . These cells have squamous morphology and feature p53 and NFkB activation , which are pathways associated with senescence. Scoring single cells for enrichment of gene programs revealed that Krt8+ ADI cells displayed high scores for genes involved in cell senescence, and the p53, MYC, and TNFA via NFkB pathways . Statistical analysis confirmed the strong and specific enrichment of genes previously associated with wound healing, angiogenesis, and the p53 pathway in these cells . This suggests that KRT8 acetylation status may play a role in regulating the senescence-associated regenerative functions.

What advanced experimental designs should be implemented to determine the causal relationship between KRT8 acetylation and autophagic flux in disease models?

To establish causality between KRT8 acetylation and autophagic flux, researchers should implement these advanced experimental designs:

• Site-specific acetylation manipulation:

  • Generate the following cell lines using CRISPR/Cas9:

    • KRT8-knockout cells

    • KRT8-K483R knock-in (acetylation-deficient)

    • KRT8-K483Q knock-in (acetylation-mimetic)

  • Reconstitute KRT8-knockout cells with:

    • Wild-type KRT8

    • K483R mutant

    • K483Q mutant

  • Assess baseline and stress-induced autophagic flux in each cell line

• Temporal control of acetylation:

  • Implement inducible systems for temporal control:

    • Tet-inducible expression of KRT8 variants

    • Chemical-genetic approaches for rapid induction of acetylation/deacetylation

  • Monitor autophagic flux before, during, and after acetylation changes

  • Establish temporal relationship between acetylation and autophagy events

• Disease model validation:

  • Test in multiple disease-relevant models:

    • Retinal degeneration models (related to RPE cells)

    • Lung injury models (bleomycin, hyperoxia)

    • Neurodegenerative disease models (where autophagy is implicated)

  • Assess acetylation status, autophagic markers, and disease progression

  • Apply acetylation-modifying interventions and evaluate outcomes

• Mechanism dissection:

  • Identify acetylation/deacetylation enzymes for KRT8-K483:

    • Use pharmacological inhibitors

    • Apply genetic knockdown/knockout approaches

    • Conduct enzyme activity assays

  • Map the complete signaling pathway from stress stimulus to KRT8 acetylation to autophagy modulation

  • Identify potential feedback mechanisms

Research has demonstrated that KRT8 expression is enhanced concomitantly with autophagy progression under oxidative stress conditions, as indicated by SQSTM1 degradation and LC3B conversion . When cells were treated with the autophagy inhibitor 3-MA, there was a decrease in KRT8 expression. Furthermore, knockdown of ATG5, a protein required for autophagosome elongation, resulted in decreased expression of KRT8 and its phosphorylated form . Transmission electron microscopy revealed that KRT8-overexpressing cells treated with paraquat showed facilitated autolysosome formation, while KRT8 knockdown cells showed only the double membranous vacuole form of autophagosomes, indicating diminished autolysosome formation due to autophagosome blockage . These findings suggest that KRT8 facilitates autophagosome clearance by enhancing the fusion process between autophagosomes and lysosomes.

What specific methodology should researchers use to validate the specificity of Acetyl-KRT8 (K483) Antibody in their experimental systems?

Rigorous validation of Acetyl-KRT8 (K483) Antibody specificity requires implementation of these methodological approaches:

• Fundamental specificity controls:

  • Peptide competition assay:

    • Pre-incubate antibody with the immunizing peptide

    • Run in parallel with non-competed antibody

    • Specific signal should be abolished by peptide competition

  • Genetic validation:

    • Test antibody in KRT8 knockout/knockdown systems

    • Compare with wild-type cells

    • Test in cells expressing KRT8-K483R mutant

• Post-translational modification specificity:

  • Deacetylation treatment:

    • Treat lysates with recombinant HDAC proteins

    • Compare signal before and after treatment

  • Multi-antibody validation:

    • Compare with different antibodies targeting the same modification

    • Use total KRT8 antibody to normalize

  • Acetylation induction:

    • Treat cells with deacetylase inhibitors to increase acetylation

    • Confirm signal increase with treatment

• Application-specific validation:

  • For Western blotting:

    • Run defined gradient of recombinant acetylated and non-acetylated KRT8

    • Determine detection limit and linear range

    • Test different blocking agents to minimize background

  • For ELISA:

    • Generate standard curve with synthetic acetylated peptide

    • Test antibody at multiple dilutions (1:2000 to 1:20000)

    • Validate with samples of known acetylation status

• Cross-reactivity assessment:

  • Test against closely related keratins:

    • Include other type II keratins (KRT1-7, KRT71-86)

    • Confirm specificity for KRT8 vs. other keratins

  • Evaluate acetylation at other lysine residues:

    • Test if antibody recognizes KRT8 acetylated at sites other than K483

    • Use synthesized peptides with acetylation at different positions

According to the product specifications, the Acetyl-KRT8 (K483) Antibody is affinity-purified from rabbit antiserum by affinity-chromatography using epitope-specific immunogen . It detects endogenous levels of Cytokeratin 8 protein only when acetylated at K483 . Western blot validation data from A549 cells demonstrates its specificity for the acetylated form . For optimal results, researchers should use the recommended dilutions: 1:500-1:2000 for Western blot and 1:20000 for ELISA applications .

How can researchers integrate multi-omics approaches with Acetyl-KRT8 (K483) Antibody-based assays to gain comprehensive insights into KRT8 function in complex biological systems?

Integrating multi-omics with Acetyl-KRT8 (K483) Antibody-based assays requires sophisticated methodological integration:

• Antibody-based enrichment for multi-omics:

  • IP-MS approach:

    • Immunoprecipitate with Acetyl-KRT8 (K483) Antibody

    • Perform mass spectrometry to identify interacting partners

    • Conduct pathway analysis of the interactome

  • ChIP-seq integration:

    • Perform ChIP-seq using Acetyl-KRT8 (K483) Antibody

    • Identify potential chromatin associations

    • Correlate with transcriptional changes

• Single-cell multi-modal analysis:

  • Cellular indexing of transcriptomes and epitopes by sequencing (CITE-seq):

    • Use Acetyl-KRT8 (K483) Antibody conjugated to oligonucleotides

    • Simultaneously measure KRT8 acetylation and transcriptome

    • Identify cell states associated with KRT8 acetylation

  • Spatial transcriptomics with immunofluorescence:

    • Combine spatial transcriptomics with Acetyl-KRT8 (K483) immunostaining

    • Map acetylation patterns to spatial gene expression domains

    • Identify spatial niches with specific acetylation patterns

• Longitudinal multi-omics:

  • Time-series experimental design:

    • Collect samples at multiple timepoints following stimulus

    • Perform antibody-based acetylation quantification

    • Parallel transcriptomics, proteomics, and metabolomics

    • Establish temporal relationships between acetylation and other molecular changes

• Integrative computational analysis:

  • Multi-level data integration:

    • Correlate KRT8 acetylation levels with:

      • Transcriptomics data (RNA-seq)

      • Proteomics profiles (phosphorylation, other PTMs)

      • Metabolomics data (especially mitochondrial metabolites)

    • Apply machine learning for pattern recognition

    • Develop predictive models of KRT8 acetylation function