title: Simple immunohistochemical staining method using large sized gold colloid conjugated secondary antibody.
abstract: To test the feasibility of semiquantitative immunohistochemical staining (IHC) with large sized gold conjugated secondary antibody (gold-2 degrees Ab), we used beads covered with a known amount of primary antibody and a secondary antibody conjugated with gold colloid particles (20 and 40 nm in diameter), and we compared the results to those obtained by enzyme IHC. Beads coated with 6 graded amounts of mouse IgG molecules showed 6 levels of color intensity. The graded color intensities could readily be distinguished. The color developed as soon as we added gold-2 degrees Ab, and the intensities were stable for 1 wk. Enzyme IHC using identical beads showed dregs of pigment after incubation in DAB for 5 min. The large sized gold-2 degrees Ab showed strong signals on cell surfaces; application of the large sized gold-2 degrees Ab to paraffin-embedded tissue sections was also feasible. The color was bright red and was easier to differentiate from hemosiderin pigment than the color developed by enzyme IHC. In conclusion, gold IHC with large sized gold-2 degrees Ab is superior to enzyme IHC for quantification of antigens via IHC. Gold IHC is especially recommended for tissues with many macrophages, such as bone marrow and spleen.
authors.affiliation: Department of Laboratory Medicine, Hospital Pathology, Catholic University Medical College, Seoul, Korea.
authors.forename: Eun Jung
authors.initials: EJ
authors.lastname: Lee
authors.forename: Yonggoo
authors.initials: Y
authors.lastname: Kim
authors.forename: Jihyang
authors.initials: J
authors.lastname: Lim
authors.forename: Myungshin
authors.initials: M
authors.lastname: Kim
authors.forename: Chang Suk
authors.initials: CS
authors.lastname: Kang
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Lee
authors.forename: Rak Sun
authors.initials: RS
authors.lastname: Mok
authors.forename: Young Nam
authors.initials: YN
authors.lastname: Park
authors.forename: Ha-Young
authors.initials: HY
authors.lastname: Choi
authors.forename: Kyungja
authors.initials: K
authors.lastname: Han
mesh_terms: D000818:Animals; D018956:CD5 Antigens / Q000032:analysis; D005240:Feasibility Studies; D019084:Fluorescent Antibody Technique, Indirect / Q000379:methods*; D017979:Gold Colloid / Q000737:chemistry*; D006801:Humans; D018796:Immunoconjugates; D007124:Immunoenzyme Techniques; D007963:Leukocytes, Mononuclear / Q000737:chemistry; D051379:Mice; D010316:Particle Size; D051381:Rats; D013194:Staining and Labeling
chemical_list: D018956:CD5 Antigens; D017979:Gold Colloid; D018796:Immunoconjugates