AC3 Antibody

What is AC3 and what cellular functions does it regulate?

Adenylate cyclase type 3 (AC3, also known as ADCY3) is a membrane-bound enzyme that catalyzes the formation of the signaling molecule cAMP in response to G-protein signaling . As one of nine closely related isoforms of adenylyl cyclases (AC1-9) in mammals, AC3 plays crucial roles in several physiological processes. The protein consists of two hydrophobic regions comprising six transmembrane helices and three large cytoplasmic domains, with the catalytic unit formed by the C1a and C2 domains .

AC3 participates in multiple biological functions including:

• Olfactory signaling: It is specifically activated by G-alpha protein GNAL/G(olf) in olfactory epithelium and is required for the perception of odorants

• Reproductive biology: It contributes to normal sperm motility and male fertility

• Metabolic regulation: AC3 plays a significant role in regulating insulin levels and body fat accumulation in response to high-fat diets

• Energy homeostasis: Research indicates that AC3 interacts with the melanocortin-4 receptor (MC4R) in regulating energy homeostasis and body weight, linking it to obesity

What types of AC3 antibodies are commercially available for research?

Based on current research resources, several types of AC3 antibodies are available for scientific applications:

• Extracellular epitope-targeting antibodies:

  • Anti-Adenylate Cyclase 3 (AC3) (extracellular) Antibody recognizes an extracellular epitope corresponding to amino acid residues 285-299 of rat ADCY3 (Accession P21932), specifically the 3rd extracellular loop

  • These are available in unconjugated forms and fluorophore-conjugated versions (e.g., ATTO Fluor-488)

• Monoclonal antibodies:

  • Mouse monoclonal IgG2a antibodies like the E-8 clone that detect AC3 in mouse, rat, and human samples

  • Mouse Monoclonal AC3 antibody raised against synthetic peptides within Rat Adcy3 conjugated to Keyhole Limpet Haemocyanin

• Variously conjugated forms:

  • Agarose, horseradish peroxidase (HRP), phycoerythrin (PE), fluorescein isothiocyanate (FITC), and multiple Alexa Fluor® conjugated antibodies for specialized applications

What experimental applications are AC3 antibodies suitable for?

AC3 antibodies are versatile tools that can be employed in multiple experimental procedures:

For western blot analysis, AC3 antibodies have successfully detected the protein in various tissues including rat lung, rat brain, and hippocampus lysates . In immunohistochemistry, these antibodies have identified AC3 in hippocampal neurons, highlighting "primary cilia" - thin rod-like extensions from neurons in the pyramidal layer .

How can I validate AC3 antibody specificity in my experimental system?

Validating antibody specificity is critical for reliable research. For AC3 antibodies, consider these methodological approaches:

• Peptide blocking experiments:

  • Pre-incubate your AC3 antibody with the immunizing peptide (e.g., Adenylate Cyclase 3/AC3 extracellular Blocking Peptide)

  • Compare staining patterns between blocked and unblocked antibody samples

  • Significant reduction or elimination of signal in blocked samples confirms specificity

• Knockout/knockdown controls:

  • Use AC3 knockout tissues or siRNA-mediated knockdown cells

  • Absence of signal in these samples supports antibody specificity

• Cross-reactivity assessment:

  • Test antibody reactivity in tissues known to express or lack AC3

  • Lung and brain tissues typically express AC3, serving as positive controls

• Multiple antibody comparison:

  • Employ two different antibodies recognizing distinct epitopes of AC3

  • Concordant staining patterns increase confidence in specificity

• Flow cytometry validation:

  • Compare with isotype controls (e.g., Rabbit IgG isotype control-ATTO 488)

  • Specific antibodies should yield distinct shifts in fluorescence compared to isotype controls

How can AC3 antibodies be utilized to study neuronal cilia function?

AC3 is enriched in neuronal primary cilia and serves as a valuable marker for these specialized cellular structures. Researchers can employ AC3 antibodies to:

• Visualize neuronal primary cilia:

  • Use immunohistochemistry with AC3 antibodies on brain sections to identify and quantify primary cilia

  • Co-stain with neuronal markers like NeuN to confirm neuronal origin of cilia structures

  • Extracellular epitope-targeting antibodies are particularly valuable as they can label cilia without cell permeabilization

• Study cilia-related signaling:

  • Investigate the role of AC3 in cilia-mediated signaling pathways through co-immunoprecipitation with known interaction partners

  • Examine cAMP production within ciliary compartments using FRET-based sensors combined with AC3 immunolabeling

• Analyze cilia morphology in pathological states:

  • Quantify changes in cilia length, abundance, or AC3 expression in disease models

  • Correlate AC3 expression with functional outcomes in neurodevelopmental or neurodegenerative conditions

• Live imaging applications:

  • Use fluorophore-conjugated extracellular AC3 antibodies for real-time visualization of cilia dynamics in living neurons

  • Track ciliary AC3 redistribution in response to various stimuli

What protocols are recommended for detecting AC3 in live cells without affecting functionality?

Detecting proteins in live cells while maintaining their functionality presents significant challenges. For AC3 investigation, the following methodological approach is recommended:

• Selection of appropriate antibody:

  • Choose antibodies targeting extracellular epitopes (e.g., Anti-Adenylate Cyclase 3 extracellular antibody)

  • These antibodies can bind AC3 without cell permeabilization, preserving cell viability

  • Consider fluorophore-conjugated versions for direct detection without secondary antibody steps

• Optimized staining protocol:

  • Use physiological buffers (PBS with Ca²⁺/Mg²⁺) at physiological pH

  • Perform all steps at lower temperatures (4-15°C) to minimize receptor internalization

  • Keep incubation times shorter (15-30 minutes) to reduce potential functional interference

  • Use dilutions of 1:25 to 1:50 for direct fluorophore-conjugated antibodies

• Validation of maintained functionality:

  • Perform cAMP assays before and after antibody binding to confirm AC3 activity is preserved

  • Compare calcium signaling or other downstream pathways in antibody-labeled versus unlabeled cells

• Applications demonstrated in published research:

  • Cell surface detection in intact living MEG-01 megakaryocytic leukemia cells using flow cytometry

  • Visualization of AC3 in rat U-87 MG cells using extracellular staining followed by secondary antibody detection or direct fluorophore-conjugated antibodies

What are common challenges when working with AC3 antibodies and how can they be addressed?

Researchers frequently encounter several challenges when working with AC3 antibodies that can be addressed through methodological refinements:

• Low signal intensity:

  • Optimize antibody concentration through titration experiments

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

  • Use signal amplification systems like tyramide signal amplification

  • For tissues, test different antigen retrieval methods (citrate buffer, pH 6.0 often works well)

• High background staining:

  • Increase blocking stringency (5% BSA or 10% normal serum from secondary antibody host species)

  • Add 0.1-0.3% Triton X-100 for intracellular applications to reduce non-specific binding

  • Include additional washing steps with 0.1% Tween-20

  • For fluorescent applications, treat samples with auto-fluorescence reducers

• Inconsistent results between experiments:

  • Standardize tissue/cell preparation protocols

  • Use internal reference proteins for normalization

  • Prepare larger batches of antibody dilutions to reduce preparation variability

  • Document lot numbers, as antibody performance can vary between lots

• Poor antibody penetration in thick tissue sections:

  • Increase detergent concentration for fixed tissues

  • Consider longer incubation times (48-72 hours) at 4°C

  • Use free-floating sections rather than slide-mounted for better access

• Epitope masking in fixed tissues:

  • Test multiple fixation protocols (paraformaldehyde concentration, duration)

  • Evaluate different antigen retrieval methods (heat-induced versus enzymatic)

  • For native epitope detection, consider using fresh-frozen sections

How can I optimize AC3 antibody use for different tissue types and fixation methods?

Different tissues and fixation protocols require specific optimization strategies for effective AC3 detection:

• Brain tissue optimization:

  • For hippocampal neurons: Use immersion-fixed, free-floating mouse brain frozen sections

  • Apply Anti-Adenylate Cyclase 3 (extracellular) antibody at 1:400 dilution

  • Co-stain with neuronal markers (e.g., NeuN) for contextual identification

  • For primary cilia visualization, examine the pyramidal layer specifically

• Lung tissue protocol:

  • Perfusion fixation with 4% paraformaldehyde provides superior morphology

  • For western blot applications, use fresh tissue lysates without fixation

  • AC3 antibodies have demonstrated reliable detection in rat lung samples at 1:200 dilutions

• Cell line-specific considerations:

  • For U-87 MG cells (human glioblastoma): Live cell surface labeling works well with 1:25-1:50 dilution of fluorophore-conjugated antibodies

  • For MEG-01 leukemia cells: Flow cytometry with 2.5-5μg antibody per sample provides optimal detection

• Fixation method comparison:

How can AC3 antibodies be used to investigate the role of AC3 in obesity and metabolic disorders?

AC3 has emerged as a significant factor in metabolic regulation, particularly in obesity and type 2 diabetes. Researchers can leverage AC3 antibodies to investigate these connections through several methodological approaches:

• Tissue-specific expression analysis:

  • Compare AC3 protein levels in adipose tissue, hypothalamus, and other metabolically active tissues between lean and obese models

  • Correlate AC3 expression with body weight, fat composition, and insulin sensitivity

  • Use immunohistochemistry to localize AC3 in appetite-regulating neurons of the hypothalamus

• Mechanistic investigations of AC3-MC4R interactions:

  • Employ co-immunoprecipitation with AC3 antibodies to isolate and identify interaction partners, particularly the melanocortin-4 receptor (MC4R)

  • Analyze downstream signaling pathways activated by this interaction

  • Use proximity ligation assays to visualize and quantify AC3-MC4R interactions in situ

• Physiological response studies:

  • Examine AC3 expression changes in response to dietary interventions (high-fat diet, caloric restriction)

  • Correlate changes in AC3 expression or localization with insulin levels and glucose homeostasis

  • Investigate the impact of exercise or other metabolic interventions on AC3 expression and activity

• Genetic model analysis:

  • Apply AC3 antibodies to characterize protein expression in AC3 knockout, knockdown, or overexpression models

  • Correlate phenotypic outcomes (body weight, food intake, energy expenditure) with protein-level alterations

  • Examine compensatory changes in other adenylyl cyclase isoforms in AC3-deficient models

What techniques can be combined with AC3 immunolabeling to study its role in olfactory signaling?

AC3 plays a crucial role in olfactory transduction, making it an important target for olfactory research. Comprehensive investigation requires combining AC3 immunolabeling with complementary techniques:

• Multi-channel imaging approaches:

  • Co-immunolabeling of AC3 with olfactory receptors and G-protein subunits (especially Gαolf)

  • Correlate AC3 expression with markers of neuronal activity (c-Fos, pCREB) following odorant exposure

  • 3D reconstruction of olfactory cilia with super-resolution microscopy to visualize AC3 nanoscale distribution

• Functional correlation techniques:

  • Combine AC3 immunolabeling with calcium imaging in olfactory neurons

  • Correlate AC3 expression levels with electrophysiological recordings of odorant responses

  • Use cAMP biosensors in conjunction with AC3 labeling to correlate protein presence with enzymatic activity

• In vivo approaches:

  • Apply AC3 antibodies in behavioral studies examining olfactory discrimination

  • Use in vivo imaging of fluorescently-tagged AC3 antibodies (when applicable) during odorant presentation

  • Examine AC3 expression changes following olfactory learning or deprivation

• Developmental and regeneration studies:

  • Track AC3 expression during olfactory neuron development and maturation

  • Monitor AC3 levels during olfactory epithelium regeneration after injury

  • Correlate AC3 expression with functional recovery of olfactory capabilities

How are AC3 antibodies contributing to understanding primary cilia function beyond olfaction?

Primary cilia are sensory organelles present on most mammalian cells, and AC3 serves as an important marker and functional component of these structures. Researchers are using AC3 antibodies to explore diverse roles of primary cilia:

• Neurological function and development:

  • AC3 antibodies reveal the distribution of neuronal primary cilia in different brain regions

  • Studies show that AC3-positive cilia on hippocampal neurons may function in memory formation and cognitive processes

  • Developmental tracking of AC3-positive cilia helps understand neurodevelopmental disorders

• Cellular signaling integration:

  • AC3 antibodies help visualize how primary cilia integrate multiple signaling pathways

  • Co-localization studies with other cilia-enriched proteins uncover signaling complexes

  • Temporal dynamics of AC3 recruitment to or removal from cilia during signaling events

• Pathological implications:

  • Altered expression or localization of AC3 in primary cilia may contribute to ciliopathies

  • AC3 antibodies help characterize ciliary defects in models of Bardet-Biedl syndrome, polycystic kidney disease, and other ciliopathies

  • Quantitative analysis of AC3-positive cilia in disease states provides insights into pathological mechanisms

• Therapeutic target validation:

  • AC3 antibodies assist in validating the targeting of cilia-specific therapies

  • Monitoring changes in AC3 expression or localization can serve as pharmacodynamic markers for ciliary-targeted interventions

What advanced imaging techniques can be combined with AC3 antibodies for cutting-edge research?

Integrating AC3 antibodies with sophisticated imaging technologies enhances our understanding of its cellular dynamics and functions:

• Super-resolution microscopy:

  • STORM/PALM techniques overcome the diffraction limit to visualize AC3 nanoscale organization

  • SIM (Structured Illumination Microscopy) improves resolution for detailed ciliary structure analysis

  • Expansion microscopy physically enlarges specimens for enhanced visualization of AC3 in complex cellular structures

• Live-cell dynamics:

  • Fluorophore-conjugated extracellular AC3 antibodies enable real-time tracking in living cells

  • Combining with photoactivatable fluorescent proteins allows pulse-chase experiments

  • FRAP (Fluorescence Recovery After Photobleaching) with labeled AC3 antibodies reveals protein mobility

• Correlative light and electron microscopy (CLEM):

  • Correlate AC3 fluorescent labeling with ultrastructural details

  • Immunogold labeling for transmission electron microscopy provides precise subcellular localization

  • Combine with tomography for 3D ultrastructural context

• Multiplexed imaging approaches:

  • Cyclic immunofluorescence or mass cytometry for simultaneous detection of AC3 with dozens of other proteins

  • Spatial transcriptomics to correlate AC3 protein expression with local gene expression profiles

  • Proximity ligation assays to visualize AC3 protein interactions in situ

• Intravital imaging applications:

  • Two-photon microscopy with fluorescent AC3 antibodies for deep tissue imaging in living organisms

  • Light-sheet microscopy for rapid 3D imaging of AC3 distribution in large tissue volumes

  • Adaptive optics to correct for optical aberrations when imaging deep within tissues