Microchip fluorescence-enhanced immunoaasay for simultaneous quantification of multiple tumor markers

Area of Science:

• Analytical Chemistry
• Biochemistry
• Biotechnology

Background:

• Carcinoma antigen 125 (CA125) and carbohydrate antigen 15-3 (CA15-3) are important biomarkers for various cancers.
• Accurate and simultaneous quantification of these biomarkers is crucial for early diagnosis and monitoring of cancer progression.

Purpose of the Study:

• To develop and validate a microchip electrophoresis-fluorescence immunoassay (MCE-LIF) for simultaneous detection of CA125 and CA15-3.
• To assess the method's sensitivity, specificity, and applicability in clinical serum samples.

Main Methods:

• Developed a fluorescence-enhanced immunoassay utilizing fluorescein isothiocyanate (FITC)-labeled monoclonal antibodies.
• Employed microchip electrophoresis (MCE) for separation of antigen-antibody complexes and free antibodies.
• Utilized laser-induced fluorescence detection (LIF) for sensitive quantification of CA125 and CA15-3.

Main Results:

• Achieved limits of detection of 0.23 U/mL for CA125 and 0.09 U/mL for CA15-3 under optimal conditions.
• Successfully quantified CA125 and CA15-3 in serum samples from healthy subjects and cancer patients.
• Demonstrated significantly elevated levels of both CA125 and CA15-3 in cancer patients compared to healthy individuals.

Conclusions:

• The MCE-LIF method provides a sensitive and simultaneous approach for quantifying CA125 and CA15-3.
• This technique holds potential for improved diagnostic and monitoring applications in oncology.
• The study highlights the utility of MCE-LIF in analyzing complex biological matrices like human serum.