Preparation and testing of diabetes autoantibody controls

Annals of the New York Academy of Sciences
Helen BrookingB Rees Smith

Abstract

Stocks of the WHO islet cell antibody, GAD(65) antibody, and IA-2 antibody standard (NIBSC 97/550) are now very limited. We have therefore made and tested a series of control preparations in which human monoclonal autoantibodies to IA-2 and to GAD(65) were diluted in antibody-negative human serum to different concentrations. Three different diabetes autoantibody controls (DAC 1-3) were made as was a negative control preparation. Aliquots containing 1 mL of autoantibodies in serum were freeze-dried. After reconstitution (with 1 mL of water) the controls were tested by (125)I-IA-2 immunoprecipitation assay (IPA), (125)I-GAD(65) IPA, GAD(65) Ab ELISA and IA-2 Ab ELISA (kits from RSR Ltd.) and for ICA by immunofluorescence test (IFT). DAC1 is particularly suitable as a control for the (125)I IA-2 IPA; DAC2 is suitable for the (125)I-GAD(65) IPA, GAD(65) Ab ELISA, and IA-2 Ab ELISA; and DAC3 is suitable for the ICA IFT. Freeze-dried preparations showed good stability at 37 degrees C. Reconstituted liquid preparations were stable when stored at 4 degrees C and at 37 degrees C. Availability of an essentially unlimited supply of these reagents should be useful in establishing reproducible and comparable measurements of diabetes autoant...Continue Reading

References

Dec 30, 1996·Clinica Chimica Acta; International Journal of Clinical Chemistry·M PowellJ Furmaniak
Dec 29, 1999·Clinica Chimica Acta; International Journal of Clinical Chemistry·M MasudaJ Furmaniak
Apr 15, 2003·Clinica Chimica Acta; International Journal of Clinical Chemistry·Helen BrookingBernard Rees Smith
Apr 30, 2003·Diabetes·Polly J BingleyPatricia W Mueller
May 5, 2005·Journal of Autoimmunity·R Ananieva-JordanovaJ Furmaniak
Jun 21, 2005·Clinica Chimica Acta; International Journal of Clinical Chemistry·Shu ChenBernard Rees Smith

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