title: Proenkephalin A in bone-derived cells.
abstract: Enkephalins, a group of small peptides with opiate-like activity, have been defined originally as neuropeptides. Recent reports showed, using in situ hybridization, that the enkephalin-encoding gene, proenkephalin A (pEnkA), is expressed in nondifferentiated cells of diverse mesodermal lineages. The transient expression of pEnkA in these tissues during organogenesis suggests that this gene is involved in processes such as differentiation and/or cell proliferation. In situ hybridization revealed that bone and cartilage are among the tissues that express pEnkA most actively during organogenesis. Here we show that pEnkA mRNA is abundant in normal calvaria-derived cells and in osteosarcoma-derived cell lines ROS 17/2.8 and ROS 25/1. In addition, pEnkA-derived peptides are synthesized and secreted by these cells, as revealed by specific RIA. pEnkA expression in ROS cells is decreased by osteogenin, an osteoinductive factor, and by the calcium-regulating hormone, 1,25-dihydroxyvitamin D3, whereas the osteoblastic phenotype marker, alkaline phosphatase, is increased by these factors. These results together with the inhibitory effects of pEnkA-derived peptides on alkaline phosphatase activity in ROS 17/2.8 cells suggest that pEnkA is involved in bone development and provide a model system for further analysis of pEnkA expression during this process.
authors.affiliation: Department of Molecular Virology, Hebrew University-Hadassah Medical School, Jerusalem, Israel.
authors.forename: H
authors.initials: H
authors.lastname: Rosen
authors.forename: R D
authors.initials: RD
authors.lastname: Polakiewicz
authors.forename: S
authors.initials: S
authors.lastname: Benzakine
authors.forename: Z
authors.initials: Z
authors.lastname: Bar-Shavit
mesh_terms: D000469:Alkaline Phosphatase / Q000235:genetics / Q000378:metabolism; D000818:Animals; D015152:Blotting, Northern; D055398:Bone Morphogenetic Protein 3; D019485:Bone Morphogenetic Proteins; D002117:Calcitriol / Q000494:pharmacology; D004745:Enkephalins / Q000235:genetics* / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D010006:Osteoblasts / Q000502:physiology*; D012516:Osteosarcoma / Q000235:genetics; D011498:Protein Precursors / Q000235:genetics* / Q000378:metabolism; D011506:Proteins / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D014407:Tumor Cells, Cultured
chemical_list: C525757:BMP3 protein, human; C525759:Bmp3 protein, rat; D055398:Bone Morphogenetic Protein 3; D019485:Bone Morphogenetic Proteins; D004745:Enkephalins; D011498:Protein Precursors; D011506:Proteins; D012333:RNA, Messenger; C029992:proenkephalin; D000469:Alkaline Phosphatase; D002117:Calcitriol