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. 2000 May;108(5):447–452. doi: 10.1289/ehp.00108447

Quantitative polymerase chain reaction for transforming growth factor-beta applied to a field study of fish health in Chesapeake Bay tributaries.

C A Harms 1, C A Ottinger 1, V S Blazer 1, C L Densmore 1, L H Pieper 1, S Kennedy-Stoskopf 1
PMCID: PMC1638039  PMID: 10811572

Abstract

Fish morbidity and mortality events in Chesapeake Bay tributaries have aroused concern over the health of this important aquatic ecosystem. We applied a recently described method for quantifying mRNA of an immunosuppressive cytokine, transforming growth factor-beta (TGF-beta), by reverse transcription quantitative-competitive polymerase chain reaction to a field study of fish health in the Chesapeake Basin, and compared the results to those of a traditional cellular immunoassay macrophage bactericidal activity. We selected the white perch (Morone americana) as the sentinel fish species because of its abundance at all of the collection sites. White perch were sampled from Chesapeake Bay tributaries in June, August, and October 1998. Splenic mononuclear cell TGF-beta mRNA levels increased and anterior kidney macrophage bactericidal activity decreased, particularly in eastern shore tributaries, from June to August and October. The results of the two assays correlated inversely (Kendall's [Tau] b = -0.600; p = 0.0102). The results indicated both temporal and spatial modulation of white perch immune systems in the Chesapeake Basin, and demonstrated the utility of quantitative PCR for TGF-beta as a molecular biomarker for field assessment of teleost fish immune status.

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Selected References

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