Glutathione S-transferase Antibody

Overview of Glutathione S-Transferases (GSTs)

GSTs catalyze the conjugation of glutathione (GSH) to electrophilic substrates, facilitating the detoxification of carcinogens, environmental toxins, and oxidative stress byproducts . The cytosolic GST family is divided into eight classes, with Alpha, Mu, Pi, and Theta being the most studied:

Research and Diagnostic Use

GST antibodies enable precise localization and quantification of GST isoforms in tissues. For example:

• GSTP1 antibodies detect elevated levels in gastric cancers compared to normal tissues .

• GSTA1 antibodies (e.g., TA308419) are used in Western blotting (1:1,000–10,000 dilution) and immunohistochemistry to study drug metabolism pathways .

Autoimmune Diseases

• Anti-GST autoantibodies are implicated in glaucoma (52% of patients) and autoimmune hepatitis (16% of patients), correlating with severe disease progression .

• In autoimmune hepatitis, anti-GSTA1-1 antibodies are markers of poor prognosis, with patients showing higher rates of liver failure .

Transplant Rejection

• Anti-GSTT1 antibodies (MFI ≥8,031) are linked to antibody-mediated rejection (ABMR) and graft loss in kidney transplants. Alloimmunization occurs in 64.5% of at-risk patients, often preceding HLA donor-specific antibodies .

GST Antibodies in Cancer

• GSTAlpha levels decrease in gastric tumors, while GSTPi increases, suggesting isoform-specific roles in carcinogenesis .

• GST overexpression in cancers contributes to chemoresistance by detoxifying agents like cisplatin and cyclophosphamide .

Mechanistic Insights

• GSTT1-null genotype recipients are prone to developing anti-GSTT1 alloantibodies post-transplant, with median peak MFI levels of 6,142 vs. 1,952 for autoantibodies .

• In kidney transplants, intragraft GSTT1 antibodies are detected in ABMR biopsies, independent of HLA antibodies .

Diagnostic and Therapeutic Implications