Kinetics of monocytoid B lymphocytes in localized inflammatory lesions induced by lipopolysaccharide in mice

Masahiko Fujino, Masaharu Ohbayashi, Naoki Ohmiya, Nobuo Kato, Junpei Asai, Masafumi Ito

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Abstract

Immunohistochemistry was used to study the kinetics of B lymphocytes (B- lys) in the early stages of the localized inflammatory response induced in SMA mice by the subcutaneous injection of lipopolysaccharide (LPS). At the injection sites, medium-sized B-lys formed early inflammatory lesions with neutrophils and activated macrophages on days 1 and 2. The B-lys were morphologically similar to monocytes, but were not stained with Mac1 antibody. Remarkably the B-lys showed the phenotypes of B220+, IgM+, IgD (slight to negative), Ly-1- and CD23- by double immunohistochemical staining. The B-lys were also positive for alkaline phosphatase. Consequently the B-lys could be identified as monocytoid B-lys or marginal zone B-lys. Plasmacytic B-lys and plasma cells were first observed on days 3 and 4, but no lymphoid follicles were found at the injection sites. In the inguinal lymph nodes, the same B-lys responses were mainly induced in the paracortical lesions (T cell areas) preceding the formation of activated germinal centers (GC). These findings suggested that the B-lys, induced by injections of LPS, matured into plasma cells in the localized inflammatory lesions independent of GC, and that they were different from follicular B-lys.

Original languageEnglish
Pages (from-to)399-407
Number of pages9
JournalPathology International
Volume46
Issue number6
DOIs
Publication statusPublished - 01-01-1996
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine

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