A family of proteins known as insulin-like growth factor-binding proteins (IGFBPs) attach to insulin-like growth factors (IGFs) and control their behavior. IGFs are known to interact with six IGFBPs (IGFBP-1 through IGFBP-6) to control their bioavailability, distribution, and signaling. These proteins are crucial for cellular development, growth, and metabolism.

Cellular activities of IGFBPs in IGF signaling. Figure 1. Cellular activities of IGFBPs in IGF signaling. (Divya Thomas, et al.; 2020)

An exclusive form of IGFBP made by HT29 cells is called HT29-IGFBP. These cells produce IGFBP molecules in culture secrete or express. Among them, various variables, including cell confluence, culture conditions, and cellular reactions to outside stimuli, might affect the levels of HT29-IGFBP.

The purpose of the HT29-IGFBP ELISA Test is to assess the concentrations of HT29-IGFBP in samples obtained from HT29 cell cultures. This test makes use of certain antibodies that are able to identify and quantify HT29-IGFBP with great specificity. Insights into the function of this specific IGFBP in cellular processes and disease mechanisms, particularly in relation to colon cancer and other gastrointestinal illnesses, can be gained by researchers and physicians by measuring the concentration of HT29-IGFBP.

The ELISA (enzyme-linked immunosorbent assay) method is utilized in this test. It involves several key steps that contribute to its accuracy and reliability. Firstly, the HT29 cells are cultured and stimulated to produce IGFBP. These cells are then collected and lysed to release the IGFBP molecules into the sample.

The ELISA test utilizes a 96-well plate as the solid-phase support. The plate is coated with specific antibodies that bind to the IGFBP molecules present in the sample. After coating, the wells are blocked to prevent nonspecific binding.

Next, the sample containing IGFBP is added to the wells and allowed to incubate. During this period, the IGFBP molecules present in the sample bind to the antibodies immobilized on the plate. After incubation, the plate is washed to remove any unbound substances, ensuring a clean and specific binding between IGFBP and the immobilized antibodies.

To detect the bound IGFBP, a secondary antibody conjugated with an enzyme is added to the wells. This secondary antibody specifically recognizes the IGFBP molecules bound to the immobilized antibodies. The enzyme attached to the secondary antibody converts a colorless substrate into a colored product in the presence of IGFBP.

Following another round of incubation, the plate is washed again to remove any unbound secondary antibody-enzyme conjugate. Then, a substrate solution is added to each well, initiating an enzymatic reaction. This reaction leads to the formation of a colored product in proportion to the amount of IGFBP present in the sample.

The intensity of the color developed is measured using a spectrophotometer. The absorbance at a specific wavelength is directly proportional to the concentration of IGFBP in the sample. A calibration curve is generated using known concentrations of IGFBP standards, allowing for the quantification of IGFBP in the test sample.

The HT29-IGFBP ELISA Test is valuable in both research and clinical settings. In research, it aids in studying the role of IGFBP in various cellular processes and disease mechanisms. In clinical applications, the test assists in diagnosing and monitoring diseases associated with altered IGFBP levels, such as certain types of cancer.

  • The infrastructure required for performing the HT29-IGFBP ELISA Test includes the following components:
  • A laboratory equipped with appropriate facilities for cell culture, sample handling, and instrument operation.
  • Cell culture supplies and reagents to maintain the HT29 cell line and induce IGFBP production.
  • ELISA kits specifically designed for measuring IGFBP in HT29 cell lysates.
  • A microplate reader or spectrophotometer capable of measuring absorbance at the desired wavelength.
  • Proper storage conditions for the ELISA kits and reagents to maintain their stability and functionality.
  • A laboratory information management system (LIMS) for data organization and analysis.
  • Trained personnel with expertise in cell culture techniques, ELISA protocols, and data interpretation.

Accurate and reliable infrastructure for the HT29-IGFBP ELISA Test is essential to ensure valid results and contribute to advancements in research and clinical practice. The careful execution of each step, adherence to quality control measures, and regular maintenance of equipment and reagents are critical for the success of this diagnostic tool.


  1. Divya Thomas, et al.; Role of tumor and stroma-derived IGF/IGFBPS in pancreatic cancer. Cancers. 2020, 12(5):1228
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