| Field | Specification |
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| Alternative Names | Hydroxycarboxylic acid receptor 1, HCA1 Receptor, G-protein coupled receptor 81, GPR81, G Protein-Coupled Receptor 104, LACR1 |
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| Isotype | |
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| Target |
Overview
Anti-GPR81/HCAR1 Antibody is an antibody targeting Hydroxycarboxylic acid receptor 1, HCA1 Receptor, G-protein coupled receptor 81, GPR81, G Protein-Coupled Receptor 104, LACR1 Polyclonal raised in Rabbit (Unconjugated). This antibody is commonly used in IHC, WB to detect, localize, or compare expression of the target across samples.
Key elements and design rationale
- Target: Hydroxycarboxylic acid receptor 1, HCA1 Receptor, G-protein coupled receptor 81, GPR81, G Protein-Coupled Receptor 104, LACR1 (also reported as Hydroxycarboxylic acid receptor 1, HCA1 Receptor, G-protein coupled receptor 81, GPR81, G Protein-Coupled Receptor 104, LACR1).
- Immunogen/epitope region: Intracellular, C-terminus.
- Homology note: Rat - 9/14 amino acid residues identical (informative for cross-species interpretation).
- Species reactivity (as provided): Rat, Mouse.
- Specificity statement (as provided): The antibody will not recognize human GPR81 (HCAR1)..
- Lot quality control (as provided): Western blot analysis.
- Peptide confirmation: Confirmed by amino acid analysis and mass spectrometry.
- Blocking peptide: Available for antigen preadsorption control where appropriate.
These attributes help researchers interpret whether signal reflects the intended target in a given assay and sample context.
Biological background
GPR81 is an orphan G-protein-coupled receptor that belongs to a family of hydroxy-carboxylic acid (HCA) receptors. Its endogenous ligand is L-lactate, a metabolite produced when glycolysis exceeds the capacity to oxidize pyruvate1,2.In addition to being a by-product of metabolism, lactate plays a role in insulin signaling, particularly in insulin mediated anti-lipolytic effects. Likewise, GPR81 is mostly expressed in adipose tissues and its activation results in inhibition of lipolysis and reduced hydrolysis of triglycerides to glycerol and fatty acids, suggesting that GPR81 may be an attractive drug discovery target for metabolic disorders4.Beyond the control of adipocyte lipolysis, GPR81 is also involved in neuronal signaling, regulation of blood flow to the retina.
Research relevance and current trends
- Comparing target expression across perturbations, genotypes, or treatment conditions.
- Interpreting localization shifts alongside pathway or phenotypic readouts.
- Using orthogonal controls (KO/KD, peptide competition, isotype concepts) to support conclusions.
Common research applications
- Western blot (WB): compare target abundance/size across lysates and conditions; consider isoforms/PTMs.
- Immunohistochemistry (IHC): examine spatial distribution in tissue and relate signal to cell-type composition.
Interpretation typically benefits from comparing matched sample sets (e.g., treated vs control, WT vs KO/KD) and using orthogonal readouts where feasible.
Notes for experimental interpretation
- Isoforms and post-translational modifications can shift apparent molecular weight or epitope accessibility across samples.
- Cross-species signal may depend on epitope conservation; consult the provided homology note when selecting models.
- Permeabilization, fixation, and antigen retrieval can change accessibility of intracellular vs extracellular epitopes.
- Conceptual control: antigen preadsorption (blocking peptide) can help assess signal dependence on the immunogen region.
- Provided control suggestions: Negative control: BLP-HR011.
- Application notes: see product-specific dilution/usage notes and control concepts provided in the dataset.
Application abbreviations: CBE- Cell-based ELISA, FC- Flow cytometry, ICC- Immunocytochemistry, IE- Indirect ELISA, IF- Immunofluorescence, IFC- Indirect flow cytometry, IHC- Immunohistochemistry, IP- Immunoprecipitation, LCI- Live cell imaging, N- Neutralization, WB- Western blot. Species abbreviations: H- Human, M- Mouse, R- Rat.
Recommended controls: Blocking peptide: BLP-HR011; Negative control: BLP-HR011.
Customization & Add-ons: Can’t find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.
