Establishment in culture of a multihormone-secreting cell strain derived from the MtT/F4 rat pituitary tumor - PubMed (original) (raw)
Establishment in culture of a multihormone-secreting cell strain derived from the MtT/F4 rat pituitary tumor
U I Richardson. J Cell Physiol. 1976 Jul.
Abstract
A clonal cell strain F4C1 has been established from the transplantable rat pituitary tumor MtT/F4 and has been maintained in continuous culture for two years. The cells grow with a population doubling time of 48 hours; the karyotype with a modal number of 39 chromosomes includes a pair of large metacentric marker chromosomes. F4C1 cells in culture produce growth hormone and prolactin but not adrenocorticotropin in contrast to the MtT/F4 tumor which secretes all three hormones in the host rat. The cloned cells lack specific receptors for thyrotropin-releasing hormone and do not respond to this agent with increased prolactin or decreased growth hormone production. Treatment with hydrocortisone results in a small increase in growth hormone and a small decrease in prolactin production. Tumors generated in rats from injected F4C1 cells secrete prolactin and growth hormone but not adrenocorticotropin. The results suggest that growth hormone and prolactin are produced by a single cell type in the MtT/F4 tumor.
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