LDH1 Antibody

Definition and Biological Relevance

LDH1, also termed L-lactate dehydrogenase A (LDHA), catalyzes the interconversion of pyruvate and lactate while regenerating NAD⁺. It is a hypoxia-inducible enzyme overexpressed in many cancers and implicated in the Warburg effect, a hallmark of tumor metabolism . LDH1 antibodies specifically bind to this isoform, facilitating studies on its role in diseases like melanoma, myocardial infarction, and bacterial infections .

Key Antibody Characteristics

LDH1 antibodies vary by host species, clonality, and applications. Below are representative examples from commercial suppliers:

Notes:

• Immunogen: Most antibodies use recombinant LDH1 protein or synthesized peptides .

• Cross-Reactivity: Some antibodies exhibit cross-reactivity with other LDH isoforms (e.g., LDH2-5) .

• Storage: Typically preserved in glycerol/PBS with 0.03% Proclin 300 or sodium azide .

Myocardial Infarction (MI) Diagnosis

LDH1 antibodies are used in immunochemical assays to measure LDH1 levels in serum. Elevated LDH1 (>100 IU/L) and an LDH1/LDH-T ratio ≥0.40 are diagnostic markers for MI, offering 93% sensitivity and 95% specificity . This method outperforms electrophoresis in early detection (8–24 hours post-symptom onset) .

Cancer Prognosis

In melanoma, high LDH1 (B4 isoform) activity correlates with improved response to immunotherapy, while LDH4 (A3B1) is linked to poor survival . Total LDH levels in blood are prognostic for tumor burden, though isoform distribution in tumors and blood may differ .

Mechanistic Insights in Cancer

• Warburg Effect: LDHA-driven lactate production supports tumor proliferation even under oxygen-rich conditions .

• Therapeutic Targeting: Inhibiting LDHA with oxamate reduces ATP synthesis and increases ROS, impairing cancer cell survival .

Bacterial Studies

LDH1 is essential for Staphylococcus aureus growth under nitrosative stress, making it a potential antimicrobial target .

Validation and Quality Control

• Western Blot: Antibodies like M00825 show clear bands at 37 kDa in HeLa and A549 cell lines .

• Immunohistochemistry: Robust cytoplasmic staining in human pancreas and thyroid cancer tissues .

• Specificity: Anti-LDH1 antibodies exhibit minimal cross-reactivity with other isoforms when purified via Protein G/Affinity Chromatography .

Future Directions

• Isoform-Specific Therapies: Developing inhibitors targeting LDHA’s metabolic and non-metabolic roles (e.g., transcriptional regulation) .

• Multiplex Assays: Integrating LDH1 detection with other biomarkers (e.g., VEGF) for precision oncology .