Abstract:
:Previously, we showed that a polypeptide isolated from fetal bovine cartilage stimulates proteoglycan synthesis, RNA synthesis, and DNA synthesis in cultured rabbit costal chondrocytes. In the present study, the effects of the cartilage-derived factor (CDF) were compared with those of multiplication-stimulating activity (MSA), which is thought to be included in somatomedins. CDF and MSA markedly increased [3H]thymidine incorporation into rabbit costal chondrocytes from 7--14 h after their additions. The incorporation of [3H]uridine was also increased within 1--2 h in the cells incubated with the peptides. These stimulations of nucleic acid syntheses were followed by cell division in serum-free culture medium. On the other hand, the peptides enhanced the synthesis of sulfated proteoglycans within 7 h. Furthermore, the extent of stimulation of proteoglycan synthesis, as measured in terms of increased incorporation of [35S]sulfate, [3H]glucosamine, or [3H]serine into material precipitated with cetylpyridinium chloride, was consistently higher than the extent of CDF or MSA stimulation of total protein synthesis, as measured in terms of increased incorporation of [3H]serine into acid-insoluble cellular material. These findings suggest that the stimulation of proteoglycan synthesis by CDF and MSA is not directly linked to the peptide-induced stimulation of cell proliferation. The present study also showed that CDF is as effective as MSA in stimulating various metabolic indices in cultured chondrocytes at their optimal concentrations.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
Kato Y,Nomura Y,Tsuji M,Ohmae H,Nakazawa T,Suzuki Fdoi
10.1093/oxfordjournals.jbchem.a133603subject
Has Abstractpub_date
1981-11-01 00:00:00pages
1377-86issue
5eissn
0021-924Xissn
1756-2651journal_volume
90pub_type
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journal_title:Journal of biochemistry
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pub_type: 杂志文章
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journal_title:Journal of biochemistry
pub_type: 杂志文章
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更新日期:1983-04-01 00:00:00
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journal_title:Journal of biochemistry
pub_type: 杂志文章
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更新日期:1982-11-01 00:00:00
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更新日期:2004-10-01 00:00:00