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A novel PTH-like peptide has recently been purified and cloned from human tumors associated with the syndrome of humoral hypercalcemia of malignancy. We surveyed the expression of mRNAs encoding this peptide in normal tissues by Northern analysis. One or more low abundance hybridizing transcripts was identified in poly(A)+ RNA prepared from human keratinocytes, thyroid, bone marrow, and fibroblasts, from bovine hypothalamus, pituitary, parathyroid, adrenal cortex, and adrenal medulla, and from rat brain, stomach mucosa, and fetal but not adult liver. One or more hybridizing transcripts was also identified in poly(A)+ RNA prepared from a number of established lines, including rat pituitary (GH4), rat pheochromocytoma (PC 12), human osteosarcoma (TE-85), and human medullary carcinoma (TT) cells. Northern analysis of mRNAs from abnormal human parathyroid tissue revealed an overexpression of transcripts for the PTH-like peptide which appeared to be specific for adenomatous or autonomous glands. These findings suggest that the PTH-like peptide is expressed in a number of endocrine and nonendocrine tissues, that it is developmentally expressed in at least one tissue (fetal liver), and that the regulation of its expression is abnormal in human parathyroid adenomas.

molecular endocrinology

Expression of Messenger Ribonucleic Acids Encoding a Parathyroid Hormone-Like Peptide in Normal Human and Animal Tissues with Abnormal Expression in Human Parathyroid Adenomas