title: Immunoglobulin and cytokine production from spleen lymphocytes is modulated in C57BL/6J mice by dietary cis-9, trans-11 and trans-10, cis-12 conjugated linoleic acid.
abstract: We evaluated the effect of cis-9, trans-11 (9c,11t) and trans-10, cis-12 (10t,12c) conjugated linoleic acid (CLA) on the immune system in C57BL/6J mice. Mice were fed experimental diets containing 0% CLA (controls), 1% 9c,11t-CLA, 1% 10t,12c-CLA or a 1:1 mixture (0.5% + 0.5%) of these two CLA isomers for 3 wk. Relative spleen weights of all CLA fed mice were greater than the controls. Spleen lymphocytes isolated from the mice fed 10t,12c-CLA produced more immunoglobulin (Ig)A and IgM but not IgG when stimulated with concanavalin A (ConA) compared with controls. IgA production from unstimulated spleen lymphocytes was greater in the 10t, 12c-CLA group than in controls. Conversely, 9c,11t-CLA did not affect the production of any of the Ig subclasses. Lymphocytes isolated from 9c,11t-CLA fed mice produced more tumor necrosis factor-alpha than the control group. The proportion of B cells in the spleen lymphocyte population was significantly lower in the 9c,11t-CLA group, and higher in the 10t,12c-CLA group than in the controls. Compared with the control group, the percentage of CD4(+) T cells was lower in the 10t,12c-CLA group, and the percentage of CD8(+) T cells was higher in the 9c,11t-CLA group. Furthermore, the percentage of CD8(+) T cells was higher in the 1:1 mixture group than in controls. The CD4(+)/CD8(+) ratio was lower in the 1:1 mixture group than in controls. These results suggest that 9c,11t and 10t,12c-CLA can stimulate different immunological effects and that the simultaneous intake of the two isomers can change the T cell population.
authors.affiliation: Laboratory of Food Chemistry, Division of Applied Biological Chemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Higashi-ku, Fukuoka 812-8581, Japan. masawo@agr.kyushu-u.ac.jp
authors.forename: Masao
authors.initials: M
authors.lastname: Yamasaki
authors.forename: Hitomi
authors.initials: H
authors.lastname: Chujo
authors.forename: Akira
authors.initials: A
authors.lastname: Hirao
authors.forename: Nami
authors.initials: N
authors.lastname: Koyanagi
authors.forename: Takeaki
authors.initials: T
authors.lastname: Okamoto
authors.forename: Naomi
authors.initials: N
authors.lastname: Tojo
authors.forename: Ayana
authors.initials: A
authors.lastname: Oishi
authors.forename: Toshio
authors.initials: T
authors.lastname: Iwata
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Yamauchi-Sato
authors.forename: Takaya
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Kentaro
authors.initials: K
authors.lastname: Tsutsumi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Tachibana
authors.forename: Koji
authors.initials: K
authors.lastname: Yamada
mesh_terms: D000818:Animals; D001402:B-Lymphocytes; D001835:Body Weight; D018791:CD4 Lymphocyte Count; D016516:CD4-CD8 Ratio; D018414:CD8-Positive T-Lymphocytes; D016207:Cytokines / Q000096:biosynthesis*; D004032:Diet; D004435:Eating; D007070:Immunoglobulin A / Q000096:biosynthesis; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007136:Immunoglobulins / Q000096:biosynthesis*; D019787:Linoleic Acid / Q000008:administration & dosage* / Q000737:chemistry; D018655:Lymphocyte Count; D008214:Lymphocytes / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D013154:Spleen / Q000166:cytology*; D013601:T-Lymphocytes
chemical_list: D016207:Cytokines; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007136:Immunoglobulins; D019787:Linoleic Acid