High resolution autoantibody detection by optimized protein G-horseradish peroxidase immunostaining in a western blotting assay.

Abstract:

:We report a procedure for optimisation of Western blotting using protein G-horseradish peroxidase (protein G-HRP) which avoids the false positive reactions often caused by second antibodies and increases the detection of autoantibodies by protein G conjugate. A number of modifications were investigated. Higher concentrations of serum and protein G-HRP at 1:5 to 1:10 and 1:100, respectively, increased the detection to the same order as that obtained with second antibody systems and gold staining with silver enhancement. The role of various detergents in the procedure was established. 3-[(3-Cholamidopropyl)-dimethylammonio]-1-propanesulfonate (CHAPS) in incubation with protein G-HRP increased the binding between protein G and immunoglobulin G. Addition of Tween-20 for blocking produced little background so that protein blockers could be avoided. Prolonged incubation with serum increased markedly the sensitivity of the procedure when compared with the recommended 2 h incubation period. Polyvinylidene difluoride membrane provided better transfer effect, lower background and higher mechanical strength than nitrocellulose membrane. The utilization of only one antibody-specific ligand increased the simplicity, reliability, economy, efficiency and specificity of the method. These modifications make this method significantly better for detection and screening for autoantibodies.

journal_name

J Immunol Methods

authors

Hu GR,Harrop P,Warlow RS,Gacis ML,Walls RS

doi

10.1016/s0022-1759(96)00235-9

subject

Has Abstract

pub_date

1997-03-28 00:00:00

pages

113-21

issue

2

eissn

0022-1759

issn

1872-7905

pii

S0022-1759(96)00235-9

journal_volume

202

pub_type

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