KCNJ16 (Ab-416) Antibody

What is KCNJ16 and what cellular functions does it mediate?

KCNJ16 encodes the inward rectifier potassium channel Kir5.1, characterized by a greater tendency to allow potassium to flow into the cell rather than out of it. Its voltage dependence is regulated by extracellular potassium concentration; as external potassium is raised, the voltage range of channel opening shifts to more positive voltages . This inward rectification primarily results from blockage of outward current by internal magnesium. KCNJ16 plays a crucial role in the regulation of fluid and pH balance in various tissues .

Studies have demonstrated its essential role in controlling electrolyte homeostasis and blood pressure, as confirmed through both human and animal models . Researchers should note that KCNJ16 mutations have been linked to several clinical manifestations including hypokalemia, renal salt wasting, and disturbed acid-base homeostasis, making it a significant target for studies on electrolyte disorders .

What are the validated applications for KCNJ16 (Ab-416) Antibody?

The KCNJ16 (Ab-416) Antibody has been validated for multiple experimental applications:

• Western Blot (WB): Used at dilutions of 1:500-1:3000

• Immunohistochemistry (IHC): Used at dilutions of 1:50-1:100

• Immunofluorescence (IF): Used at dilutions of 1:100-1:500

• Enzyme-Linked Immunosorbent Assay (ELISA)

The antibody has been verified in Western blot analysis of extracts from HeLa cells, showing specific detection of Kir5.1 protein . Additionally, immunohistochemistry analysis of paraffin-embedded human brain tissue and immunofluorescence analysis of HeLa cells have confirmed its utility across multiple experimental platforms .

What species reactivity does KCNJ16 (Ab-416) Antibody demonstrate?

The KCNJ16 (Ab-416) Antibody has confirmed reactivity against:

• Human

• Mouse

• Rat

This cross-species reactivity makes it particularly valuable for comparative studies and translation of findings between model organisms and human samples. Researchers should note that the antibody detects endogenous levels of total Kir5.1 protein across these species, allowing for native protein expression studies without requiring overexpression systems .

What are the optimal storage and handling protocols for KCNJ16 (Ab-416) Antibody?

For optimal performance and longevity of the KCNJ16 (Ab-416) Antibody:

• Upon receipt, store at either -20°C or -80°C

• Avoid repeated freeze-thaw cycles as these can compromise antibody function and specificity

• The antibody is provided in liquid form containing rabbit IgG in phosphate buffered saline (without Mg²⁺ and Ca²⁺), pH 7.4, 150mM NaCl, 0.02% sodium azide, and 50% glycerol

This formulation is designed to maintain antibody stability during long-term storage while preventing microbial contamination. The high glycerol content prevents complete freezing at -20°C, which helps preserve antibody structure and function during storage.

How can researchers optimize Western blot protocols for KCNJ16 detection?

To achieve optimal results when using KCNJ16 (Ab-416) Antibody for Western blot analysis:

• Sample preparation: Total protein extraction from tissues or cells should be performed using buffers containing protease inhibitors to prevent degradation of Kir5.1.

• Protein loading: Standardize protein loading (20-50μg per lane) using quantification methods like Bradford assay.

• Gel selection: 10% polyacrylamide gels are commonly used for resolving Kir5.1 protein .

• Transfer optimization: For optimal transfer of Kir5.1 to nitrocellulose membranes, use wet transfer systems at 100V for 60 minutes or 30V overnight at 4°C .

• Blocking: Use 5% non-fat milk or BSA in TBST for 1 hour at room temperature.

• Antibody dilution: Begin with a 1:1000 dilution for initial optimization, then adjust based on signal strength. A working range of 1:500-1:3000 is recommended .

• Detection: Use appropriate HRP-conjugated secondary antibodies and develop with ECL substrates such as Clarity Western ECL .

• Normalization: Normalize to total protein loading using technologies like Bio-Rad Stain-Free® for accurate quantification .

The antibody has been validated to detect endogenous levels of Kir5.1 protein in HeLa cell extracts, confirming its specificity and utility for Western blot applications .

What considerations should be made when using KCNJ16 (Ab-416) Antibody for immunohistochemistry?

For successful immunohistochemical detection of KCNJ16:

• Tissue fixation: Use 4% paraformaldehyde for optimal preservation of epitopes. Overfixation may mask antibody binding sites.

• Antigen retrieval: Perform heat-induced epitope retrieval using citrate buffer (pH 6.0) or EDTA buffer (pH 9.0) to expose antibody binding sites that may be masked during fixation.

• Antibody dilution: Begin with a 1:75 dilution, with a recommended range of 1:50-1:100 .

• Incubation conditions: Incubate with primary antibody overnight at 4°C to ensure optimal binding.

• Negative controls: Include sections without primary antibody and, if possible, use tissues from KCNJ16 knockout models as negative controls.

• Detection systems: Use polymer-based detection systems for enhanced sensitivity with minimal background.

The antibody has been successfully used for immunohistochemical analysis of paraffin-embedded human brain tissue , demonstrating its capability to detect Kir5.1 in fixed neural tissue, which is particularly relevant for neuroscience research applications.

How can KCNJ16 (Ab-416) Antibody be used to investigate channel mutations associated with electrolyte disorders?

To effectively study KCNJ16 mutations associated with electrolyte disorders:

• Model selection: Utilize cell lines expressing wild-type and mutant KCNJ16, such as those generated through CRISPR-Cas9 technology. For instance, the I26T mutation has been studied in rat models to investigate its effects on electrolyte homeostasis .

• Co-immunoprecipitation: Employ KCNJ16 (Ab-416) Antibody for co-immunoprecipitation studies to investigate altered protein-protein interactions in mutant channels.

• Subcellular localization: Compare subcellular localization patterns between wild-type and mutant KCNJ16 using immunofluorescence with the KCNJ16 (Ab-416) Antibody (dilution 1:100-1:500) .

• Expression quantification: Assess changes in protein expression levels using Western blot analysis, normalizing to appropriate housekeeping proteins.

• Functional correlation: Correlate antibody-based detection with electrophysiological measurements to establish structure-function relationships.

What strategies can be employed to study KCNJ16 interactions with other potassium channel subunits?

For investigating KCNJ16 interactions with other potassium channel subunits:

• Co-expression systems: Utilize bicistronic vectors encoding KCNJ16 alongside other channel subunits, such as Kir4.1 (KCNJ10). A WT bicistronic vector encoding the Kir4.1/5.1 channel (pBUDCE4.1-human KCNJ10/KCNJ16) has been successfully used in previous studies .

• Co-immunoprecipitation: Use KCNJ16 (Ab-416) Antibody to pull down KCNJ16 and associated proteins, followed by Western blot analysis for potential binding partners.

• Proximity ligation assay: Combine KCNJ16 (Ab-416) Antibody with antibodies against suspected interaction partners to visualize protein-protein interactions in situ.

• Immunofluorescence co-localization: Perform double immunofluorescence labeling using KCNJ16 (Ab-416) Antibody (1:100-1:500 dilution) and antibodies against other channel subunits .

• FRET analysis: Utilize fluorescently tagged channel subunits alongside antibody labeling to assess direct interactions through Förster resonance energy transfer.

Research has shown that KCNJ16 (Kir5.1) can form heteromeric channels with other Kir family members, particularly Kir4.1, altering channel properties and physiological functions . Understanding these interactions is crucial for comprehending the diverse roles of KCNJ16 in different tissues and pathological conditions.

How does KCNJ16 expression vary across different tissues and cell types?

KCNJ16 expression patterns show notable tissue specificity:

• Neural tissue: KCNJ16 is expressed in the brain, as demonstrated by successful immunohistochemical detection using KCNJ16 (Ab-416) Antibody in human brain tissue . This makes it relevant for neuroscience research applications .

• Renal tissue: KCNJ16 plays crucial roles in the kidney, particularly in controlling electrolyte homeostasis and blood pressure, as evidenced by the effects of KCNJ16 mutations on renal function .

• Gene expression analysis: When investigating tissue-specific expression, researchers should employ both antibody-based detection methods and complementary techniques such as RT-PCR or RNA-seq for comprehensive profiling.

• Cell type identification: Double-labeling with KCNJ16 (Ab-416) Antibody and cell type-specific markers can identify which cell populations express the channel within heterogeneous tissues.

The importance of KCNJ16 in renal function is underscored by studies showing that mutations in KCNJ16 can lead to hypokalemia, salt wasting, and disturbed acid-base homeostasis . Additionally, its presence in neural tissue suggests potential roles in neurological function, possibly relating to potassium channel modulation in the treatment of neurological disorders .

What methodological approaches can identify KCNJ16 role in acid-base balance regulation?

To investigate KCNJ16's role in acid-base balance regulation:

• Animal models: Utilize KCNJ16 knockout or mutant models, such as the I26T rat model based on Dahl salt-sensitive rats, to assess physiological changes. These models allow for analysis of blood pH, HCO₃⁻ levels, and other acid-base parameters under various conditions .

• Cell culture systems: Employ cell lines expressing wild-type or mutant KCNJ16 to study channel function in controlled environments.

• pH measurement: Use intracellular pH indicators alongside KCNJ16 (Ab-416) Antibody immunofluorescence to correlate channel expression with pH regulation at the cellular level.

• Electrophysiology: Combine antibody-based detection with patch-clamp recordings to correlate channel expression with functional properties.

• Pharmacological manipulation: Assess the effects of pH-altering compounds on channel activity in systems with confirmed KCNJ16 expression.

Research has identified KCNJ16 mutations in patients with chronic metabolic acidosis, demonstrating its importance in maintaining acid-base homeostasis . For instance, a homozygous variant of KCNJ16 (I26T) was identified in an Amish patient affected with chronic metabolic acidosis with low serum bicarbonate concentration, although subsequent animal studies suggested this particular variant might be benign .

How can researchers validate KCNJ16 (Ab-416) Antibody specificity in their experimental systems?

To ensure antibody specificity and reliable experimental results:

• Knockout/knockdown controls: Use KCNJ16 knockout or knockdown samples as negative controls to confirm antibody specificity.

• Peptide competition assays: Pre-incubate the antibody with the immunizing peptide prior to application to confirm binding specificity.

• Multiple detection methods: Validate findings using multiple applications (WB, IHC, IF) to ensure consistent results across different detection platforms .

• Cross-reactivity testing: Test the antibody against closely related proteins, particularly other Kir family members, to evaluate potential cross-reactivity.

• Signal verification: Compare detected molecular weight with the predicted size of KCNJ16 (approximately 48 kDa).

The KCNJ16 (Ab-416) Antibody has been affinity-purified from rabbit antiserum by affinity-chromatography using epitope-specific immunogen, which enhances its specificity . It has demonstrated consistent detection in multiple applications and species, supporting its reliability as a research tool.

What experimental approaches can assess the impact of post-translational modifications on KCNJ16 function?

To investigate post-translational modifications (PTMs) of KCNJ16:

• Phosphorylation state analysis: Use phosphatase treatments of samples prior to Western blot analysis with KCNJ16 (Ab-416) Antibody to assess phosphorylation states.

• Glycosylation assessment: Employ PNGase F treatments similar to those used for ENaC subunits to remove N-linked glycans, followed by Western blot analysis to detect changes in protein migration .

• Mass spectrometry: Combine immunoprecipitation using KCNJ16 (Ab-416) Antibody with mass spectrometry to identify specific PTM sites.

• Collision-induced affinity selection mass spectrometry (CIAS-MS): This technique has been used to identify ligands associated with other Kir family members and could be adapted for KCNJ16 studies .

• Site-directed mutagenesis: Generate constructs with mutations at potential PTM sites and compare with wild-type KCNJ16 using the antibody to detect changes in expression or localization.

Understanding PTMs is crucial as they can significantly affect channel function, localization, and protein-protein interactions, potentially contributing to pathological conditions associated with KCNJ16 dysfunction.

How can KCNJ16 (Ab-416) Antibody be utilized in neuroscience research applications?

For neuroscience applications:

• Neural expression mapping: Use immunohistochemistry with KCNJ16 (Ab-416) Antibody (1:50-1:100 dilution) to map Kir5.1 expression patterns across different brain regions .

• Co-localization with neural markers: Perform double immunofluorescence labeling with KCNJ16 (Ab-416) Antibody (1:100-1:500) and neuronal or glial markers to determine cell type-specific expression .

• Activity-dependent regulation: Investigate changes in KCNJ16 expression following neuronal activity manipulation using Western blot analysis with KCNJ16 (Ab-416) Antibody.

• Subcellular localization in neurons: Use high-resolution imaging techniques with the antibody to determine precise subcellular localization within neuronal compartments.

• Neurological disorder models: Compare KCNJ16 expression in control versus disease model tissues to identify potential alterations.

KCNJ16 has been identified as relevant to neuroscience research, suggesting potential roles in neurological functions . The successful immunohistochemical detection of KCNJ16 in human brain tissue using this antibody makes it a valuable tool for investigating its neural functions .

What are the common challenges and solutions when working with KCNJ16 (Ab-416) Antibody?

These troubleshooting approaches are based on standard practices for working with antibodies similar to KCNJ16 (Ab-416) Antibody and will help researchers optimize their experimental conditions to achieve reliable, reproducible results .

How can researchers quantitatively analyze KCNJ16 expression data?

For rigorous quantitative analysis of KCNJ16 expression:

• Western blot quantification:

  • Use total protein normalization rather than single housekeeping proteins for more accurate quantification

  • Employ stain-free technology or similar methods to detect total protein per lane

  • Analyze band intensity using software such as Bio-Rad Image Lab 6.1

  • Apply appropriate statistical analyses (ANOVA or Student's t-tests) with corrections for multiple comparisons using methods like Benjamini and Hochberg

• Immunofluorescence quantification:

  • Use consistent acquisition parameters across all samples

  • Analyze mean fluorescence intensity across multiple fields and samples

  • Apply appropriate background subtraction methods

  • Consider cell-by-cell analysis for heterogeneous populations

• IHC quantification:

  • Use digital image analysis software for consistent evaluation

  • Consider H-score or similar semi-quantitative scoring systems

  • Include standard positive controls in each experiment for normalization

• Data presentation and analysis:

  • Present data as means with standard errors of the means (SEM)

  • Consider p-values less than 0.05 as statistically significant

  • Apply appropriate statistical tests based on data distribution and experimental design

These approaches ensure robust, reproducible quantification of KCNJ16 expression across different experimental platforms.