| Mechanism for differential sensitivity of the chromosome and growth cycles of mammalian cells to the rate of protein synthesis. | |
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MedLine Citation:
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PMID: 3837839 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It has been documented widely that when the generation times of eucaryotic cells are lengthened by slowing the rate of protein synthesis, the duration of the chromosome cycle (S, G2, and M phases) remains relatively invariant. Paradoxically, when the growth of exponentially growing cultures of CHO cells is partially inhibited with inhibitors of protein synthesis, the immediate effect is a proportionate reduction in the rate of total protein, histone protein, and DNA synthesis. However, on further investigation it was found that over the next 2 h the rates of histone protein and DNA synthesis recover, in some cases completely to the uninhibited rate, while the synthesis rates of other proteins do not recover. We called this process chromosome cycle compensation. The amount of compensation seen in CHO cell cultures can account quantitatively for the relative invariance in the length of the chromosome cycle (S, G2, and M phases) reported for these cells. The mechanism for this compensation involves a specific increase in the levels of histone mRNAs. An invariant chromosome cycle coupled with a lengthening growth cycle must result in a disproportionate lengthening of the G1 phase. Thus, these results suggest that chromosome cycle invariance may be due more to specific cellular compensation mechanisms rather than to the more usual interpretation involving a rate-limiting step for cell cycle progression in the G1 phase. |
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Authors:
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R S Wu; W M Bonner |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Molecular and cellular biology Volume: 5 ISSN: 0270-7306 ISO Abbreviation: Mol. Cell. Biol. Publication Date: 1985 Nov |
Date Detail:
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Created Date: 1986-09-29 Completed Date: 1986-09-29 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 8109087 Medline TA: Mol Cell Biol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2959-66 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cell Cycle* / drug effects Cell Line Chromosomes / physiology* Cricetinae Cricetulus Cycloheximide / pharmacology DNA Replication / drug effects Female Histones / biosynthesis, genetics Hydroxyurea / pharmacology Kinetics Ovary Protein Biosynthesis* / drug effects |
| Chemical | |
Reg. No./Substance:
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0/Histones; 127-07-1/Hydroxyurea; 66-81-9/Cycloheximide |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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