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Molecular Endocrinology, Vol 3, 503-508, Copyright © 1989 by Endocrine Society

ARTICLES

The parathyroid hormone-related protein associated with malignancy is secreted by neuroendocrine tumors

LJ Deftos, AF Gazdar, K Ikeda and AE Broadus
Department of Medicine, University of California, San Diego VA Medical Center, La Jolla 92161.

We have demonstrated the production of the PTH-related protein (PTHrP) associated with hypercalcemia of malignancy by human neuroendocrine cell lines that also produce calcitonin gene products and chromogranin A. PTHrP was demonstrable in the cells by immunocytochemistry and immunoassay and Northern analysis of the cells revealed the presence of multiple mRNAs for PTHrP. The cell lines also secreted PTHrP in a regulated fashion, with the most potent secretagogue being phorbol. Thus, PTHrP is secreted by neuroendocrine cells and it may have neuroectodermal lineage. The coexpression of calcitonin gene products and chromogranin A, also neuroendocrine, with PTHRP may influence its secretion and ultimate biological effects in vivo.


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