Method for detecting syphilis using synthetic antigens

Abstract

An antigen composition and method for the detection of antibodies to Treponema pallidum and the diagnosis of syphilis are described. The antigen composition contains synthetic cardiolipin and synthetic lecithin. The antigen composition may additionally contain cholesterol and an alcohol. The antigen composition is useful as an immunoreagent in immunoassays for the detection of antibodies associated with T. pallidum infection. The methods are sensitive and specific for T. pallidum infection.

1. An antigen composition comprising between 0.01 and 0.05% by volume tetramyristoyl cardiolipin and between 0.11 and 0.16% by volume 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine. 
     
     
       2. The antigen composition of  claim 1 , further comprising cholesterol. 
     
     
       3. The composition of  claim 2 , wherein the volume concentration of cholesterol is 0.9%. 
     
     
       4. The composition of  claim 2 , further comprising an alcohol. 
     
     
       5. The composition of  claim 1 , wherein the concentration of cardiolipin is between 0.02 and 0.04%. 
     
     
       6. The composition of  claim 5 , wherein the volume concentration of cardiolipin is 0.03%. 
     
     
       7. The composition of  claim 1 , wherein the concentration of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine is between 0.11 and 0.16%. 
     
     
       8. The composition of claim  7  1, wherein the volume concentration of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine is 0.14%. 
     
     
       9. The composition of  claim 4 , wherein the alcohol is ethanol. 
     
     
       10. A method for detecting anti-lipoidal antibodies in a human comprising combining a biological sample from the human with a composition comprising tetramyristoyl cardiolipin and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine and detecting an immunocomplex formed between an anti-lipoidal antibody in the biological sample and the composition. 
     
     
       11. The method of  claim 10 , wherein the composition further comprises cholesterol and an alcohol. 
     
     
       12. The method of  claim 11 , wherein the volume concentration of cholesterol in the composition is 0.9%. 
     
     
       13. The method of  claim 10 , wherein the alcohol is ethanol. 
     
     
       14. The method of  claim 10 , wherein the volume concentration of tetramyristoyl cardiolipin in the composition is between 0.01 and 0.05%. 
     
     
       15. The method of  claim 10 , wherein the volume concentration of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine in the composition is between 0.11 and 0.16%. 
     
     
       16. The method of  claim 10 , wherein the detection of an immunocomplex is used to diagnose syphilis in the human. 
     
     
       17. The method of  claim 10 , wherein the immunocomplex is detected using a flocculation or agglutination test. 
     
     
       18. The antigen composition of  claim 1  comprising between 0.02 and 0.04% tetramyristoyl cardiolipin, and between 0.11 and 0.16% 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine. 
     
     
       19. An antigen composition comprising between 0.02 and 0.04% by volume tetramyristoyl cardiolipin, between 0.11 and 0.16% by volume 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, 0.9% by volume cholesterol, and ethanol to volume. 
     
     
       20. An antigen composition comprising 0.03% by volume tetramyristoyl cardiolipin, between 0.11 and 0.16% by volume 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, and 0.9% by volume natural cholesterol in absolute ethanol to volume. 
     
     
       21. A method for detecting anti-lipoidal antibodies in a human comprising:
 (a) obtaining a biological sample from a human; 
 (b) combining the biological sample with a composition comprising between 0.02 and 0.04% by volume tetramyristoyl cardiolipin, between 0.11 and 0.16% by volume 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, 0.9% by volume cholesterol, and ethanol to volume; and 
 (c) detecting an immunocomplex formed between an antibody in the biological sample and the composition. 
 
     
     
       22. The method of  claim 21 , wherein the detection of the immunocomplex is used to diagnose syphilis in the human. 
     
     
       23. The method of  claim 10 , wherein the volume concentration of tetramyristoyl cardiolipin in the composition is between 0.02 and 0.04%. 
     
     
       24. An antigen composition consisting of tetramyristoyl cardiolipin, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, cholesterol, and an alcohol. 
     
     
       25. The composition of claim 24, wherein the volume concentration of tetramyristoyl cardiolipin is between 0.01 and 0.05%, the volume concentration of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine is between 0.11 and 0.16%, and the volume concentration of cholesterol is 0.9%. 
     
     
       26. The composition of claim 25, wherein the volume concentration of tetramyristoyl cardiolipin is between 0.02 and 0.04%.