Development of monkey C-reactive protein (CRP) assay methods

Area of Science:

• Biochemistry
• Immunology
• Veterinary Medicine

Background:

• C-reactive protein (CRP) is a key biomarker for inflammation.
• Accurate CRP measurement is crucial for diagnosing and monitoring inflammatory conditions in non-human primates.
• Existing human CRP assays may lack specificity and sensitivity for accurate quantification in monkey serum.

Purpose of the Study:

• To develop and validate monkey-specific C-reactive protein (CRP) assay methods.
• To establish reference ranges for CRP in normal and acutely inflamed monkeys.
• To compare the sensitivity of the developed monkey-specific assay with human-specific CRP assays.

Main Methods:

• Preparation of anti-monkey CRP serum via rabbit immunization with immune complexes.
• Confirmation of antibody specificity using immunoelectrophoresis and Western blotting.
• Purification of monkey CRP using chromatography and verification by SDS-PAGE.
• Quantification of CRP levels in normal and turpentine oil-induced acute-phase monkey sera using sandwich ELISA and turbidimetric immunoassay (TIA).

Main Results:

• Monkey-specific CRP assay methods, including sandwich ELISA and TIA, were successfully developed.
• Normal monkey serum CRP levels ranged from 0.26 to 1.42 microg/ml (mean 0.71+/-0.37).
• Acute-phase monkey serum CRP levels significantly increased, ranging from 248 to 451 microg/ml (mean 371.2+/-73.8).
• The monkey-specific TIA demonstrated higher sensitivity for detecting monkey CRP compared to human-specific assays.

Conclusions:

• Validated monkey-specific CRP assay methods provide reliable tools for assessing inflammation in non-human primates.
• The developed assays enable accurate monitoring of inflammatory responses in research settings.
• The enhanced sensitivity of the monkey-specific TIA offers improved diagnostic capabilities for primate inflammatory diseases.