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Five single-cell clone lines (mRTP1B, mRTP1E, mRTP1F, mRTP1K, and mRTP2A) have been developed from adult rainbow trout pituitary glands. These cell lines have been maintained in a CO(2)-independent medium supplemented with 10% fetal bovine serum (FBS) for more than 150 passages. At about 150 passages, the doubling time of each single-cell clone in a CO(2)-independent medium supplemented with 10% FBS at 20 degrees C was 3.6+/-0.7, 2.8+/-0.7, 3.2+/-0.8, 5.5+/-0.6, and 6.6+/-0.6 days respectively. Each single-cell clone contains 60+/-2 chromosomes, which is within the range of the 2N chromosome numbers reported for rainbow trout. Reverse transcription-PCR analysis revealed that in addition to expressing gh, prolactin (prl), and estradiol (E(2)) receptor alpha (e2ralpha or esr1) genes, each single-cell clone line also expressed other pituitary-specific genes such as tsh, gonadotropin 1 (gth-1 or fshb), gonadotropin 2 (gth-2 or lhb), somatolactin (sl or smtl), proopiomelanocortin-B (pomcb), and corticosteroid receptor (cr or nr3c1). Immunocytochemical analysis showed that all the five single-cell clones produced both Gh and Prl. Furthermore, the expression of gh and prl genes in the single-cell clone lines is responsive to induction by E(2), dexamethasone, and o,p'-dichlorodiphenyltrichloroethane. All together, these results confirm that each of the single-cell clones was derived from rainbow trout pituitary glands. These single-cell clone lines not only can be used to study factors that regulate the expression of pituitary hormone genes, but can also be developed as a rapid screening system for identifying environmental endocrine disruptors.

Development and characterization of five rainbow trout pituitary single-cell clone lines capable of producing pituitary hormones