Characterization of Two Novel mAbs Recognizing Different Epitopes on CD43.

Area of Science:

• Immunology
• Biochemistry
• Hematology

Background:

• CD43 is a potential biomarker for acute leukemia diagnosis.
• Existing qualitative assays for leukemia-specific CD43 lack quantitative capabilities.
• Novel monoclonal antibodies (mAbs) are needed for precise CD43 detection.

Purpose of the Study:

• To develop novel mAbs for quantitative detection of leukemia-specific CD43.
• To characterize mAbs 2C8 and 8E10 for their binding specificities and epitopes on CD43.
• To establish a sandwich ELISA assay for detecting leukemia-specific CD43 using the developed mAbs.

Main Methods:

• Development of two novel mAbs, 2C8 and 8E10, targeting CD43.
• Sandwich ELISA and western blotting were used to characterize the mAbs and confirm antigen specificity.
• Enzyme assays and analysis of normal tissues were performed to investigate epitope characteristics and distribution.

Main Results:

• Two novel mAbs, 2C8 and 8E10, recognizing distinct epitopes on CD43 were successfully developed.
• The mAbs were confirmed to recognize CD43 and demonstrated differential epitope distribution on leukemic cell lines.
• Enzyme assays indicated that the recognized epitopes are sialic acid-dependent, with distinct patterns observed in normal tissues.

Conclusions:

• Monoclonal antibodies 2C8 and 8E10, along with YG5, can be utilized in a sandwich ELISA for quantitative detection of leukemia-specific CD43.
• These developed mAbs offer a promising tool for improving the diagnosis and monitoring of acute leukemia.
• The characterization of distinct and sialic acid-dependent epitopes provides valuable insights into CD43 biology in leukemia.