Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) is an immune checkpoint receptor expressed on activated T cells and regulatory T cells. This transmembrane glycoprotein acts as a negative regulator of T cell activation by competing with the costimulatory receptor CD28 for binding to B7 ligands on antigen-presenting cells. CTLA-4 engagement delivers inhibitory signals that reduce T cell responses. It plays an important role in maintaining immune homeostasis and preventing autoimmunity. The protein has become a major focus in immunotherapy research, particularly in cancer treatment and autoimmune disease studies.
The Human cytotoxic T lymphocyte associated antigen 4,CTLA-4 ELISA Kit (CSB-E09171h) is designed for quantitative detection of CTLA4 in human serum, plasma, and tissue homogenates. This sandwich ELISA provides a detection range of 125 pg/mL to 8000 pg/mL with a sensitivity of 31.25 pg/mL. The assay requires 50-100 μL sample volume and can be completed within 1-5 hours, with measurements taken at 450 nm wavelength.
Application Examples
Note: The following application examples are drawn from a selection of publications citing this product. For additional applications, please refer to the full list of references in the "Citations" section.
This ELISA kit has been used in research examining immune checkpoint proteins and their roles in various physiological and pathological conditions. Studies have applied the kit to quantify soluble CTLA-4 levels in serum samples and measure CTLA-4 protein expression in tissue specimens, supporting research into immune regulation mechanisms.
• Endometrial research: Quantification of CTLA-4 protein levels in endometrial tissue biopsies alongside other immune checkpoint markers to examine immune regulatory mechanisms in reproductive biology
• Serum biomarker studies: Measurement of soluble CTLA-4 concentrations in serum samples to assess circulating levels of this immune checkpoint protein in clinical research contexts
• Immune checkpoint profiling: Analysis of CTLA-4 expression patterns as part of broader immune checkpoint protein research to understand T-cell regulatory pathways