Production and characterization of monoclonal antibodies specific for Cryptococcus neoformans capsular polysaccharide.

Abstract:

:Cryptococcus neoformans is surrounded by a capsular polysaccharide. There are at least four known serotypes of the polysaccharide. The objective of this study was to produce monoclonal antibodies (MAbs) that could be used to study the distribution of epitopes among the serotypes of C. neoformans. BALB/c mice were immunized with cryptococcal polysaccharides of serotype A or D that were coupled to sheep erythrocytes. Splenocytes were isolated, and hybridomas secreting MAbs specific for cryptococcal polysaccharides were isolated. Two hybridomas, designated MAbs 439 and 1255, were produced from mice immunized with serotype A polysaccharide. One hybridoma, designated MAb 302, was produced from mice immunized with serotype D polysaccharide. All three antibodies were of the immunoglobulin G1 isotype. MAb 302 showed a specificity for serotypes A and D in Ouchterlony diffusion, agglutination, and opsonophagocytosis assays. MAb 1255 was reactive with polysaccharides and cells of serotypes A, B, and D. MAb 439 was reactive with polysaccharides and cells of serotypes A, B, C, and D. The reactivity of these MAbs closely matched the distribution of epitopes among cryptococcal polysaccharides predicted in previous studies of polyclonal antibodies reactive with cryptococcal polysaccharides. The ability to produce a MAb against an epitope shared by all four serotypes may have value for the detection of cryptococcal antigens in body fluids.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Eckert TF,Kozel TR

doi

10.1128/IAI.55.8.1895-1899.1987

subject

Has Abstract

pub_date

1987-08-01 00:00:00

pages

1895-9

issue

8

eissn

0019-9567

issn

1098-5522

journal_volume

55

pub_type

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