Induced CYP1A2 activity as a phenotypic biomarker in humans highly exposed to certain PCBs/PCDFs

George H. Lambert, Larry L. Needham, Wayman Turner, Te Jen Lai, Donald George Jr Patterson, Y. Leon Guo

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Polychlorinated biphenyls (PCBs), dibenzo-p-dioxins (PCDDs), and dibenzofurans (PCDFs) continue to be a worldwide public health concern due to their levels in the environment and humans, and associated adverse health effects. In animals, one of the most sensitive effects of physiologically significant body burdens has been the induction of cytochrome P4501 (CYP1) family of enzymes. This study examined the capacity of CYP1 enzyme induction to be a biomarker of exposure to a mixture of PCBs and PCDFs and of adverse human health effects. We followed a group of people highly exposed to PCBs and PCDFs due to accidental ingestion of contaminated rice oil, the Yucheng cohort. A total of 174 Yucheng and 134 control subjects were studied. The caffeine breath test, a monitor of CYP1A2 activity, was conducted, and its results were compared to serum levels of chemicals and the subjects' medical history. Total dioxin serum toxic equivalency (TEQ) in the Yucheng cohort and their controls were 577 ± 393 ppt lipid and 21 ppt lipid, respectively. CYP1A2 activity was elevated in Yucheng subjects more than 2-fold and correlated with serum TEQ (R2 = 0.62). Manifestations like chloracne, fingernail abnormalities, and headaches were well predicted by P4501A2 activity. It is concluded that CYP1A2 induction seen in the Yucheng cohort is an excellent biomarker of exposure and human health effects in individual subjects and cohort.

Original languageEnglish (US)
Pages (from-to)6176-6180
Number of pages5
JournalEnvironmental Science and Technology
Volume40
Issue number19
DOIs
StatePublished - Oct 1 2006

Fingerprint

Cytochrome P-450 CYP1A2
Polychlorinated Biphenyls
dibenzofuran
PCDD
Biomarkers
biomarker
PCB
Poisons
Health
Cytochromes
serum
dioxin
cytochrome
Lipids
Dioxins
lipid
Public health
Enzymes
enzyme
Caffeine

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Lambert, G. H., Needham, L. L., Turner, W., Lai, T. J., Patterson, D. G. J., & Guo, Y. L. (2006). Induced CYP1A2 activity as a phenotypic biomarker in humans highly exposed to certain PCBs/PCDFs. Environmental Science and Technology, 40(19), 6176-6180. https://doi.org/10.1021/es0608646
Lambert, George H. ; Needham, Larry L. ; Turner, Wayman ; Lai, Te Jen ; Patterson, Donald George Jr ; Guo, Y. Leon. / Induced CYP1A2 activity as a phenotypic biomarker in humans highly exposed to certain PCBs/PCDFs. In: Environmental Science and Technology. 2006 ; Vol. 40, No. 19. pp. 6176-6180.
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Lambert, GH, Needham, LL, Turner, W, Lai, TJ, Patterson, DGJ & Guo, YL 2006, 'Induced CYP1A2 activity as a phenotypic biomarker in humans highly exposed to certain PCBs/PCDFs', Environmental Science and Technology, vol. 40, no. 19, pp. 6176-6180. https://doi.org/10.1021/es0608646

Induced CYP1A2 activity as a phenotypic biomarker in humans highly exposed to certain PCBs/PCDFs. / Lambert, George H.; Needham, Larry L.; Turner, Wayman; Lai, Te Jen; Patterson, Donald George Jr; Guo, Y. Leon.

In: Environmental Science and Technology, Vol. 40, No. 19, 01.10.2006, p. 6176-6180.

Research output: Contribution to journalArticle

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AU - Lambert, George H.

AU - Needham, Larry L.

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AU - Lai, Te Jen

AU - Patterson, Donald George Jr

AU - Guo, Y. Leon

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AB - Polychlorinated biphenyls (PCBs), dibenzo-p-dioxins (PCDDs), and dibenzofurans (PCDFs) continue to be a worldwide public health concern due to their levels in the environment and humans, and associated adverse health effects. In animals, one of the most sensitive effects of physiologically significant body burdens has been the induction of cytochrome P4501 (CYP1) family of enzymes. This study examined the capacity of CYP1 enzyme induction to be a biomarker of exposure to a mixture of PCBs and PCDFs and of adverse human health effects. We followed a group of people highly exposed to PCBs and PCDFs due to accidental ingestion of contaminated rice oil, the Yucheng cohort. A total of 174 Yucheng and 134 control subjects were studied. The caffeine breath test, a monitor of CYP1A2 activity, was conducted, and its results were compared to serum levels of chemicals and the subjects' medical history. Total dioxin serum toxic equivalency (TEQ) in the Yucheng cohort and their controls were 577 ± 393 ppt lipid and 21 ppt lipid, respectively. CYP1A2 activity was elevated in Yucheng subjects more than 2-fold and correlated with serum TEQ (R2 = 0.62). Manifestations like chloracne, fingernail abnormalities, and headaches were well predicted by P4501A2 activity. It is concluded that CYP1A2 induction seen in the Yucheng cohort is an excellent biomarker of exposure and human health effects in individual subjects and cohort.

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