| The mechanism of ascorbic acid-induced differentiation of ATDC5 chondrogenic cells. | |
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MedLine Citation:
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PMID: 20530736 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The ATDC5 cell line exhibits a multistep process of chondrogenic differentiation analogous to that observed during endochondral bone formation. Previous investigators have induced ATDC5 cells to differentiate by exposing them to insulin at high concentrations. We have observed spontaneous differentiation of ATDC5 cells maintained in ascorbic acid-containing alpha-MEM. A comparison of the differentiation events in response to high-dose insulin vs. ascorbic acid showed similar expression patterns of key genes, including collagen II, Runx2, Sox9, Indian hedgehog, and collagen X. We took advantage of the action of ascorbic acid to examine signaling events associated with differentiation. In contrast to high-dose insulin, which downregulates both IGF-I and insulin receptors, there were only minimal changes in the abundance of these receptors during ascorbic acid-induced differentiation. Furthermore, ascorbic acid exposure was associated with ERK activation, and ERK inhibition attenuated ascorbic acid-induced differentiation. This was in contrast to the inhibitory effect of ERK activation during IGF-I-induced differentiation. Inhibition of collagen formation with a proline analog markedly attenuated the differentiating effect of ascorbic acid on ATDC5 cells. When plates were conditioned with ATDC5 cells exposed to ascorbic acid, ATDC5 cells were able to differentiate in the absence of ascorbic acid. Our results indicate that matrix formation early in the differentiation process is essential for ascorbic acid-induced ATDC5 differentiation. We conclude that ascorbic acid can promote the differentiation of ATDC5 cells by promoting the formation of collagenous matrix and that matrix formation mediates activation of the ERK signaling pathway, which promotes the differentiation program. |
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Authors:
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Tecla M Temu; Ke-Ying Wu; Philip A Gruppuso; Chanika Phornphutkul |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2010-06-08 |
Journal Detail:
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Title: American journal of physiology. Endocrinology and metabolism Volume: 299 ISSN: 1522-1555 ISO Abbreviation: Am. J. Physiol. Endocrinol. Metab. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-09 Completed Date: 2010-07-21 Revised Date: 2011-08-03 |
Medline Journal Info:
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Nlm Unique ID: 100901226 Medline TA: Am J Physiol Endocrinol Metab Country: United States |
Other Details:
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Languages: eng Pagination: E325-34 Citation Subset: IM |
Affiliation:
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Department of Pediatrics, Division of Pediatric Endocrinology and Metabolism, Rhode Island Hospital and Brown University, 593 Eddy Street, Providence, RI 02903, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Antioxidants / pharmacology* Ascorbic Acid / pharmacology* Blotting, Western Cell Differentiation / drug effects* Cell Line Cell Proliferation / drug effects Cell Size / drug effects Chondrocytes / drug effects* Collagen / biosynthesis Extracellular Signal-Regulated MAP Kinases / metabolism Hypoglycemic Agents / pharmacology Insulin / pharmacology, physiology Insulin-Like Growth Factor I / physiology Mice Reverse Transcriptase Polymerase Chain Reaction |
| Grant Support | |
ID/Acronym/Agency:
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P20-RR-024484/RR/NCRR NIH HHS; R01 HD024455-22/HD/NICHD NIH HHS; R01-HD-24455/HD/NICHD NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Antioxidants; 0/Hypoglycemic Agents; 11061-68-0/Insulin; 50-81-7/Ascorbic Acid; 67763-96-6/Insulin-Like Growth Factor I; 9007-34-5/Collagen; EC 2.7.11.24/Extracellular Signal-Regulated MAP Kinases |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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