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Characterization of the role played by antigen challenge in the suppression of in vivo humoral immunity by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).

Abstract：

:The goal of these studies was to characterize the role played by antigen challenge in 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-induced immunosuppression. The effects of single exposure to TCDD (4.2, 14, and 42 microg/kg) in B6C3F1 mice on the reverse plaque assay (RPA; no sensitization) and the sheep red blood cell (SRBC) antibody response were compared. While the RPA was suppressed in a dose-dependent fashion with significance at the two highest doses, a much more dramatic effect was noted with the primary anti-SRBC response: a suppression was noted at the lowest dose, which was comparable to that observed with the highest dose in the RPA. Subsequent studies compared the RPA in B6C3F1 (Ah-high responder) and DBA/2 (Ah-low responder) mice after both single and repeated exposure to identical cumulative doses of TCDD (4.2, 14, and 42 microg/kg). The repeated exposures consisted of 14 consecutive daily treatments of 0.3, 1.0, and 3.0 microg/kg. The results indicated only a slight difference in the effects of TCDD in the two strains after single exposure, and even less difference after repeated exposure. Moreover, administering TCDD on different days relative to the SRBC challenge indicated a suppression in both strains when given 1, 2, or 3 days before antigen challenge, on the day of antigen challenge, or 1 or 2 days after antigen challenge. The only day of administration where the suppression was attenuated was 3 days after antigen challenge. These results confirm an important relationship between antigen challenge and TCDD exposure on immunosuppression.

journal_name

Arch Toxicol

journal_title

Archives of toxicology

authors

Matulka RA,Morris DL,Wood SW,Kaminski NE,Holsapple MP

doi

10.1007/s002040050467

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

45-51

issue

1

eissn

0340-5761

issn

1432-0738

journal_volume

72

pub_type

杂志文章

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