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Record Details

Record 80 of 854
Mouse osteoblastic cell line (MC3T3-E1) expresses extracellular calcium (Ca2+o)-sensing receptor and its agonists stimulate chemotaxis and proliferation of MC3T3-E1 cells
Author and Affiliation:
Yamaguchi, T.(Brigham and Women's Hospital, and Harvard Medical School, Department of Medicine, Boston, Massachusetts 02115, United States)
Chattopadhyay, N.
Kifor, O.
Butters, R. R. Jr
Sugimoto, T.
Brown, E. M.
O'Malley, B. W. [Principal Investigator]
Abstract: The calcium-sensing receptor (CaR) is a G protein-coupled receptor that plays key roles in extracellular calcium ion (Ca2+o) homeostasis in parathyroid gland and kidney. Osteoblasts appear at sites of osteoclastic bone resorption during bone remodeling in the "reversal" phase following osteoclastic resorption and preceding bone formation. Bone resorption produces substantial local increases in Ca2+o that could provide a signal for osteoblasts in the vicinity, leading us to determine whether such osteoblasts express the CaR. In this study, we used the mouse osteoblastic, clonal cell line MC3T3-E1. Both immunocytochemistry and Western blot analysis, using an antiserum specific for the CaR, detected CaR protein in MC3T3-E1 cells. We also identified CaR transcripts in MC3T3-E1 cells by Northern analysis using a CaR-specific riboprobe and by reverse transcription-polymerase chain reaction with CaR-specific primers, followed by nucleotide sequencing of the amplified products. Exposure of MC3T3-E1 cells to high Ca2+o (up to 4.8 mM) or the polycationic CaR agonists, neomycin and gadolinium (Gd3+), stimulated both chemotaxis and DNA synthesis in MC3T3-E1 cells. Therefore, taken together, our data strongly suggest that the osteoblastic cell line MC3T3-E1 possesses both CaR protein and mRNA very similar, if not identical, to those in parathyroid and kidney. Furthermore, the CaR in these osteoblasts could play a key role in regulating bone turnover by stimulating the proliferation and migration of such cells to sites of bone resorption as a result of local release of Ca2+o.
Publication Date: Oct 01, 1998
Document ID:
20040142202
(Acquired Nov 09, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research (ISSN 0884-0431); Volume 13; 10; 1530-8
Publisher Information: United States
Contract/Grant/Task Num: DK-41415; DK-48330; DK-52005
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CALCIUM; DETECTION; MICE; OSTEOBLASTS; ANTIBIOTICS; BONES; CELL DIVISION; CULTURED CELLS; GADOLINIUM; GENETICS; GLUCOSIDES; MOLECULAR WEIGHT; POLYMERASE CHAIN REACTION; RIBONUCLEIC ACIDS
Other Descriptors: CALCIUM/METABOLISM; CHEMOTAXIS/DRUG EFFECTS; OSTEOBLASTS/DRUG EFFECTS/METABOLISM; RECEPTORS, CELL SURFACE/GENETICS/METABOLISM; ANIMALS; BLOTTING, NORTHERN; BONE REMODELING; CELL DIVISION; CELL LINE; GADOLINIUM/PHARMACOLOGY; MICE; MOLECULAR WEIGHT; NEOMYCIN/PHARMACOLOGY; POLYMERASE CHAIN REACTION; RNA, MESSENGER/METABOLISM; RECEPTORS, CALCIUM-SENSING; SUPPORT, NON-U.S. GOV'T; SUPPORT, U.S. GOV'T, P.H.S; NASA DISCIPLINE MUSCULOSKELETAL; NON-NASA CENTER
Availability Source: Other Sources
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