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The repertoire diversity and magnitude of antibody responses to bacterial antigens in aged mice: I. Age-associated changes in antibody responses differ according to the mouse strain.

Abstract：

:Aging influences the host immune responses in various ways. In aging mice we have studied the antibody responses to two unrelated bacterial antigens. Streptococcus pneumoniae R36a vaccine (Pn) and TNP coupled to Brucella abortus (TNP-BA). Aged animals (20-24 months old) of the C57BL/6 strain had markedly reduced numbers of IgM antibody plaque-forming cells (PFC) to Pn as compared to young/adult mice (2-3 months old). In contrast, the anti-Pn IgM PFC responses of aged BALB/c mice were consistently higher than they were in the young/adult mice. The increased anti-Pn responses were not due to a nonspecific immunostimulation, because the responses of aged BALB/c mice to TNP-BA were lower as compared to the adults. However, the aged BALB/c mice responded relatively poorly to Pn challenge, and their IgG responses (as determined by ELISA plaque assay) demonstrated a very high individual variability. The clonotypic diversity of anti-Pn response in young BALB/c and C57BL/6 is limited, such that the majority of PFC produce antibody that express all idiotopes (Id) of the T15 immunoglobulin encoded in the VH-S107/Vk22 genes. In contrast, the PFC from aged mice are diverse, expressing incomplete T15 Id or none at all, suggesting that the antibodies are encoded by altered T15 genes and by different, non-T15 genes. Our data demonstrate that the age-related changes in the magnitude of antibody response to certain antigens are influenced by the host genetic make-up, and that the changes in magnitude and diversity of antibody response may be unrelated to each other.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Nicoletti C,Cerny J

doi

10.1016/0008-8749(91)90180-j

subject

Has Abstract

pub_date

1991-03-01 00:00:00

pages

72-83

issue

1

eissn

0008-8749

issn

1090-2163

pii

0008-8749(91)90180-J

journal_volume

133

pub_type

杂志文章

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