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Detection of Antibodies to Squalene III. Naturally Occurring Antibodies to Squalene in Humans and Mice

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An ELISA-based assay is described for the measurement of antibodies to squalene SQE in human serum and plasma. The assay was adapted from the previously described assay for murine antibodies to SQE J. Immunol. Methods 267 2002 119. Like the murine SQE antibody assay, the human antibody assay used sterile cell culture 96-well plates coated with SQE 20 nmolwell. Phosphate-buffered saline PBS-0.5 casein was used as both a blocking agent and dilution buffer. The assay has a high through-put capacity and is reproducible and quantitative. This assay was used to evaluate samples from three different human cohorts. The first cohort was retired employees of the United States Army Medical Research Institute of Infectious Diseases USAMRIID alumni. The mean age was 68 N40 range 58-82. Most were vaccinated with the U.S. licensed anthrax vaccine AVA and most had received several other vaccines through a USAMRIID special immunization program. The second cohort was of similar age N372 mean age 67 range 54-97 from the normal population of Frederick, MD and were not vaccinated with AVA. The third cohort N299 was from Camp Memorial Blood Center, United States Army Medical Department Activities, Fort Knox, KY. No additional volunteer information is available. Using this new ELISA method, antibodies to SQE were detected in all three of the cohorts. IgG antibodies to SQE were detected in 7.5 and 15.1 of the samples from the USAMRIID alumni and Frederick cohorts, respectively. These differences were not significantly different chi121.69, p0.19. In contrast, no IgG antibodies to SQE were detected in the Fort Knox cohort which is significantly different than the Frederick cohort chi1249.25, p0.0001. IgM antibodies to SQE were detected in 37.5 and 32.3 of the samples from the USAMRIID and Frederick cohorts, respectively, but there was no significant difference between cohorts.

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  • Medicine and Medical Research
  • Pharmacology
  • Chemical, Biological and Radiological Warfare

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