Double-enzyme conjugates, producing an intermediate color, for simultaneous and direct detection of three different intracellular immunoglobulin determinants with only two enzymes

A new double-enzyme conjugate was synthesized by coupling alkaline phosphatase (AP) to horseradish peroxidase (HRP). After AP (blue) and subsequent HRP (red) cytochemistry, this new conjugate produced a stable intermediate-colored (violet) product. By coupling this double-enzyme conjugate to an anti...

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Veröffentlicht in:The journal of histochemistry and cytochemistry 1986-04, Vol.34 (4), p.423-428
Hauptverfasser: Claassen, E, Boorsma, DM, Kors, N, Van Rooijen, N
Format: Artikel
Sprache:eng
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Zusammenfassung:A new double-enzyme conjugate was synthesized by coupling alkaline phosphatase (AP) to horseradish peroxidase (HRP). After AP (blue) and subsequent HRP (red) cytochemistry, this new conjugate produced a stable intermediate-colored (violet) product. By coupling this double-enzyme conjugate to an antigen (trinitrophenyl, TNP) or an antibody (anti-mouse immunoglobulin G2a), anti-TNP or -IgG2a-producing cells could be demonstrated as violet cells in spleen sections. This led to the development of a rapid one-step incubation--two-step cytochemical procedure for simultaneous detection of three different determinants in a single tissue section. To demonstrate this novel triple staining method, we coupled three different antigens to, respectively, AP, HRP, and AP-HRP. When spleen sections of immunized animals were incubated with a mixture of these three antigen-enzyme conjugates, we could distinguish antibody-forming cells against each of these three antigens simultaneously as red (HRP), blue (AP), and violet (AP-HRP) cells. The simultaneous detection of three different classes of intracellular antibodies in a single section also proved to be possible with this method. With this study we provide a new direct method for detection of three different intracellular immunoglobulins after a one-step incubation and a two-step standard cytochemical procedure.
ISSN:0022-1554
1551-5044
DOI:10.1177/34.4.2419394