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Infect. Immun., Jan 1997, 227-235, Vol 65, No. 1
HY Wu, EB Nikolova, KW Beagley, JH Eldridge and MW Russell
Intranasal (i.n.) immunization with bacterial protein antigens coupled to
cholera toxin B subunit (CTB) effectively induces mucosal, especially
salivary immunoglobulin A (IgA), and nonmucosal antibody responses in mice.
To examine the regional distribution of antigen- specific B and T cells
after i.n. immunization, antibody-secreting cells and antigen-responsive T
cells in cervical lymph nodes (CLN) were compared with those found after
intraoral or subcutaneous (in the neck) administration of the same antigen
and with T cells found in mesenteric lymph nodes (MLN) and spleen after
intragastric immunization. The i.n. immunization induced predominantly IgA
antibody-secreting cells in salivary glands and IgA and IgG
antibody-secreting cells in the superficial and central CLN; these
responses were quantitatively enhanced if the antigen was coupled to CTB.
Intraoral immunization also induced IgA and IgG antibody-secreting cells in
the superficial and central CLN, but only if intact cholera toxin was
included as an adjuvant. In contrast, subcutaneous (neck) immunization
induced IgG antibody-secreting cells mainly in the draining facial lymph
nodes. CLN cell populations resembled those of MLN, except that CLN
lymphocytes had higher proportions of T cells and lower proportions of B
cells and a slightly higher CD4+/CD8+ ratio among T cells than the MLN
lymphocytes did. T cells that proliferated in response to antigen in vitro
were found especially in central CLN 2 days after i.n. immunization and
persisted for up to 6 months, whereas after intragastric immunization,
responsive T cells were not found in the MLN for up to 14 days. After
culture with antigen in vitro, T cells from the superficial CLN of i.n.
immunized mice secreted both gamma interferon and interleukin-4. Therefore,
after i.n. immunization, superficial and central CLN represent sites of
regional lymphocyte development, and the central CLN in particular appear
to be sites where memory T cells persist.
Copyright © 1997, American Society for Microbiology
Development of antibody-secreting cells and antigen-specific T cells in cervical lymph nodes after intranasal immunization
Department of Microbiology, University of Alabama at Birmingham, 35294, USA.
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