Abstract
This study assessed early effects of short-term Cd exposure on T and B cell responsiveness. Spleen cells from mice injected s. c. with a daily dosage of 1 mg, 0.33 mg, or 0.11 mg Cd (as CdCl2) per kg body weight for 5 days were examined for their potential to generate alloreactive T cells in a mixed lymphocyte reaction (MLR) and for mitogen reactivity to concanavalin A (Con A) in vitro. Spleen cells from the same mice were also assayed for the total number of IgM- and IgG-secreting B cells. Whereas alloreactivity was reduced, mitogen response to Con A was not different from controls or was even enhanced. The decrease in allogeneic MLR was dependent on the injected Cd dosage. No difference in susceptibility to Cd-induced effects was observed among the mouse strains tested, i.e. BALB/c, DBA/2, C57BL/6, and C3H/He. Co-cultivation of spleen cells, obtained from Cd-treated mice that exhibited deficient T cell reactivity, with splenic responder cells from untreated mice resulted in dose-dependent suppression of the normal MLR. These results indicate that the harmful effects of Cd on the immune system include the inhibition of antigen-specific T cell responses by the activation of an antigen non-specific suppressor system. In contrast to the suppressed allogeneic MLR, the same spleen cell populations showed augmented numbers of IgM- and IgG-antibody producing cells.
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Abbreviations
- Cd:
-
cadmium
- Con A:
-
concanavalin A
- CTL:
-
cytotoxic T lymphocyte
- HBSS:
-
Hank's Balanced Salt Solution
- LPS:
-
lipopolysaccharide
- MLR:
-
mixed lymphocyte reaction
- MMC:
-
mitomycin C
- MT:
-
metallothionein
- PFC:
-
plaque forming cell
- PHA:
-
phytohemagglutinin
- PMA:
-
phorbolmyristic acid
- SI:
-
stimulation index
- SPF:
-
specific pathogen-free
- SRBC:
-
sheep red blood cells
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Hurtenbach, U., Oberbarnscheidt, J. & Gleichmann, E. Modulation of murine T and B cell reactivity after short-term cadmium exposure in vivo. Arch Toxicol 62, 22–28 (1988). https://doi.org/10.1007/BF00316252
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DOI: https://doi.org/10.1007/BF00316252