Detection and characterization of Ah receptor in tissue and cells from human tonsils

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Toxicology and Applied Pharmacology; (USA)

DOI:https://doi.org/10.1016/0041-008X(91)90203-Q· OSTI ID:5888920

Lorenzen, A; Okey, A B ^[1]

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1. Hospital for Sick Children, Toronto, Ontario (Canada)

Ah receptor was identified and characterized in cytosol and nuclear extracts from human tonsils obtained at surgery from children 2 to 6 years of age. Ah receptor was found in cytosol prepared from whole-tonsil homogenates as well as in cytosol and nuclear fractions prepared from tonsil lymphocytes or tonsil fibroblasts grown in primary culture. Cytosolic Ah receptor was detectable in tonsillar tissue with either halogenated (2,3,7,8-(3H)tetrachlorodibenzo-p-dioxin (TCDD)) or nonhalogenated (3-(3H)methylcholanthrene and (3H)benzo(a)pyrene) aromatic hydrocarbons and sedimented at approximately 9 S after velocity sedimentation on sucrose gradients. The apparent binding affinity (Kd) of (3H)TCDD for Ah receptor ranged from 3 to 12 nM in cytosols from seven different donors. The same analyses indicated a concentration of Ah receptor in human tonsils of approximately 100-300 fmol/mg cytosolic protein. Incubation of either tonsil lymphocytes or tonsil fibroblasts with (3H)TCDD resulted in transformation of cytosolic Ah receptor to a nuclear binding form which could be detected as a specifically labeled peak sedimenting at approximately 6 S on sucrose gradients. These data demonstrate the existence of Ah receptor in human tonsils and suggest that this immune organ may be an appropriate model for further studies on the mechanism and manifestation of aromatic hydrocarbon-induced immunotoxicity in man.

• OSTI ID: 5888920
• Journal Information: Toxicology and Applied Pharmacology; (USA), Journal Name: Toxicology and Applied Pharmacology; (USA) Vol. 107:2; ISSN TXAPA; ISSN 0041-008X
• Country of Publication: United States
• Language: English

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