scholarly journals Regulation of human histone gene expression during the HeLa cell cycle requires protein synthesis.

1984 ◽  
Vol 4 (12) ◽  
pp. 2723-2734 ◽  
Author(s):  
H L Sive ◽  
N Heintz ◽  
R G Roeder
Keyword(s):  
Cell Cycle ◽  
Protein Synthesis ◽  
S Phase ◽  
Histone Gene ◽  
Protein Synthesis Inhibitor ◽  
Protein Synthesis Inhibition ◽  
Synthesis Inhibitor ◽  
Synthesis Inhibition ◽  
Histone Mrnas ◽  
Histone Gene Expression

We have examined the effects of protein synthesis inhibition on histone gene expression during the HeLa cell cycle. Histone mRNAs, which normally are rapidly degraded in the absence of DNA synthesis, persist and increase in concentration when translation is inhibited before DNA replication is halted. This is not a function of polysomal shielding of these mRNAs from active degradation mechanisms since inhibitors of translation initiation alone effect stabilization and induction. The superinduction of histone mRNAs by protein synthesis inhibition is effective at the G1/S border, and in the S-phase and non-S-phase periods of the cell cycle. However, the relative increase in histone mRNA is greater when cells not synthesizing DNA are treated with a protein synthesis inhibitor than when S-phase cells are so treated. Non-histone mRNAs examined are not superinduced by translation inhibition. Transcription rates from both histone and non-histone genes increase after protein synthesis inhibition. Although the decrease in histone gene transcription associated with DNA synthesis inhibition is prevented and reversed by protein synthesis inhibition, we have no evidence that histone gene-specific transcriptional regulation is dependent on protein synthesis. Transcriptional increases may contribute to the superinduction effect but cannot explain its differential extent during the cell cycle, since these increases are similar when replicating or nonreplicating cells are treated with a protein synthesis inhibitor. We believe that changes in histone mRNA stability can account for much of the differential superinduction effect. Our results indicate a requirement for continuing protein synthesis in the cell cycle regulation of histone mRNAs.

Regulation of human histone gene expression during the HeLa cell cycle requires protein synthesis

1984 ◽  
Vol 4 (12) ◽  
pp. 2723-2734
Author(s):  
H L Sive ◽  
N Heintz ◽  
R G Roeder
Keyword(s):  
Cell Cycle ◽  
Protein Synthesis ◽  
S Phase ◽  
Histone Gene ◽  
Protein Synthesis Inhibitor ◽  
Protein Synthesis Inhibition ◽  
Synthesis Inhibitor ◽  
Synthesis Inhibition ◽  
Histone Mrnas ◽  
Histone Gene Expression

We have examined the effects of protein synthesis inhibition on histone gene expression during the HeLa cell cycle. Histone mRNAs, which normally are rapidly degraded in the absence of DNA synthesis, persist and increase in concentration when translation is inhibited before DNA replication is halted. This is not a function of polysomal shielding of these mRNAs from active degradation mechanisms since inhibitors of translation initiation alone effect stabilization and induction. The superinduction of histone mRNAs by protein synthesis inhibition is effective at the G1/S border, and in the S-phase and non-S-phase periods of the cell cycle. However, the relative increase in histone mRNA is greater when cells not synthesizing DNA are treated with a protein synthesis inhibitor than when S-phase cells are so treated. Non-histone mRNAs examined are not superinduced by translation inhibition. Transcription rates from both histone and non-histone genes increase after protein synthesis inhibition. Although the decrease in histone gene transcription associated with DNA synthesis inhibition is prevented and reversed by protein synthesis inhibition, we have no evidence that histone gene-specific transcriptional regulation is dependent on protein synthesis. Transcriptional increases may contribute to the superinduction effect but cannot explain its differential extent during the cell cycle, since these increases are similar when replicating or nonreplicating cells are treated with a protein synthesis inhibitor. We believe that changes in histone mRNA stability can account for much of the differential superinduction effect. Our results indicate a requirement for continuing protein synthesis in the cell cycle regulation of histone mRNAs.

Effect of protein synthesis Inhibition on brain corticotropin-releasing factor and plasma adrenocorticotropin

1990 ◽  
Vol 68 (12) ◽  
pp. 1595-1600
Author(s):  
Daniel A. Haas ◽  
William C. Sturtridge ◽  
Susan R. George
Keyword(s):  
Protein Synthesis ◽  
Corticotropin Releasing Factor ◽  
Protein Synthesis Inhibitor ◽  
Protein Synthesis Inhibition ◽  
Plasma Acth ◽  
Synthesis Inhibitor ◽  
Brain Areas ◽  
Synthesis Inhibition ◽  
General Protein Synthesis ◽  
General Protein

The effect of inhibiting protein synthesis on concentrations of corticotropin-releasing factor (CRF) in rat brain and plasma adrenocorticotropin (ACTH) was assessed following the administration of the general protein synthesis inhibitor anisomycin. Compared with vehicle-injected controls, protein synthesis inhibition resulted in significantly reduced CRF immunoreactivity (CRF-ir) in median eminence within 1 h (p < 0.01), remained decreased after 4 h (p < 0.025), and was nonsignificantly decreased after 24 h. Plasma ACTH levels were greatly increased within 1 h posttreatment (p < 0.0005), continued elevated after 4 h (p < 0.01), and returned to normal levels after 24 h. CRF-ir measured in other brain areas 24 h after anisomycin showed decreased levels in medulla–pons (p < 0.025) and neurointermediate lobe of pituitary (p < 0.05), with no change noted in frontal cortex, hippocampus, midbrain–thalamus, or cerebellum. Overall these data show that blockade of normal protein synthesis with anisomycin can elicit changes in CRF-ir and ACTH content.Key words: corticotropin-releasing factor, adrenocorticotropin, anisomycin.

scholarly journals THE REGULATION OF RNA SYNTHESIS AND PROCESSING IN THE NUCLEOLUS DURING INHIBITION OF PROTEIN SYNTHESIS

1969 ◽  
Vol 41 (1) ◽  
pp. 177-187 ◽  
Author(s):  
Margherita Willems ◽  
Maria Penman ◽  
Sheldon Penman
Keyword(s):  
Protein Synthesis ◽  
Rna Synthesis ◽  
Synthesis Rate ◽  
Protein Synthesis Inhibitor ◽  
Partial Recovery ◽  
Protein Synthesis Inhibition ◽  
Synthesis Inhibitor ◽  
Synthesis Inhibition ◽  
Synthesis And Processing ◽  
Time Required

The effect of protein synthesis inhibition by cycloheximide on nucleolar RNA synthesis and processing has been studied in HeLa cells. Synthesis of 45S RNA precursor falls rapidly after administration of the drug. However, the nucleolar content of 45S RNA remains relatively constant for at least 1 hr because the time required for cleavage of the precursor molecule into its products is lengthened after treatment with cycloheximide. The efficiency of transformation of 45S RNA to 32S RNA remains constant with approximately one molecule of the 32S RNA produced for each cleavage of a molecule of 45S RNA. However, shortly after the cessation of protein synthesis the formation of 18S RNA becomes abortive. The amount of 32S RNA present in the nucleolus remains relatively constant. After long periods of protein synthesis inhibition the 28S RNA continues to be synthesized and exported to the cytoplasm but at a greatly reduced rate. When the protein synthesis inhibitor is removed, a prompt, although partial, recovery in the synthesis rate of 45S RNA occurs. The various aspects of RNA synthesis regulation and processing are discussed.

scholarly journals Regulation of histone mRNA in the unperturbed cell cycle: evidence suggesting control at two posttranscriptional steps.

1991 ◽  
Vol 11 (5) ◽  
pp. 2416-2424 ◽  
Author(s):  
M E Harris ◽  
R Böhni ◽  
M H Schneiderman ◽  
L Ramamurthy ◽  
D Schümperli ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Half Life ◽  
S Phase ◽  
Protein Synthesis Inhibitor ◽  
Mrna Levels ◽  
Histone Mrna ◽  
Synthesis Inhibitor ◽  
Processing Efficiency ◽  
Histone 3 ◽  
Cycle Regulation

The levels of histone mRNA increase 35-fold as selectively detached mitotic CHO cells progress from mitosis through G1 and into S phase. Using an exogenous gene with a histone 3' end which is not sensitive to transcriptional or half-life regulation, we show that 3' processing is regulated as cells progress from G1 to S phase. The half-life of histone mRNA is similar in G1- and S-phase cells, as measured after inhibition of transcription by actinomycin D (dactinomycin) or indirectly after stabilization by the protein synthesis inhibitor cycloheximide. Taken together, these results suggest that the change in histone mRNA levels between G1- and S-phase cells must be due to an increase in the rate of biosynthesis, a combination of changes in transcription rate and processing efficiency. In G2 phase, there is a rapid 35-fold decrease in the histone mRNA concentration which our results suggest is due primarily to an altered stability of histone mRNA. These results are consistent with a model for cell cycle regulation of histone mRNA levels in which the effects on both RNA 3' processing and transcription, rather than alterations in mRNA stability, are the major mechanisms by which low histone mRNA levels are maintained during G1.

scholarly journals The E2F transcription factor activates a replication-dependent human H2A gene in early S phase of the cell cycle.

1996 ◽  
Vol 16 (5) ◽  
pp. 1889-1895 ◽  
Author(s):  
F Oswald ◽  
T Dobner ◽  
M Lipp
Keyword(s):  
Gene Expression ◽  
Cell Cycle ◽  
Transcription Factor ◽  
Transcriptional Activation ◽  
Promoter Region ◽  
S Phase ◽  
Histone Gene ◽  
Luciferase Reporter ◽  
Transcriptional Level ◽  
Histone Gene Expression

Histone gene expression is restricted to the S phase of the cell cycle. Control is mediated by a complex network of sequence-specific DNA-binding factors and protein-protein interactions in response to cell cycle progression. To further investigate the regulatory functions that are associated at the transcriptional level, we analyzed the regulation of a replication-dependent human H2A.1-H2B.2 gene pair. We found that transcription factor E2F binds specifically to an E2F recognition motif in the H2A.1 promoter region. Activation of the H2A.1 promoter by E2F-1 was shown by use of luciferase reporter constructs of the intergenic promoter region. Overexpression of the human retinoblastoma suppressor gene product RB suppressed E2F-1 mediated transcriptional activation, indicating an E2F-dependent regulation of promoter activity during the G1-to-S-phase transition. Furthermore, the activity of the H2A.1 promoter was also downregulated by overexpression of the RB-related p107, a protein that has been detected in S-phase-specific protein complexes of cyclin A, E2F, and cdk2. In synchronized HeLa cells, expression of luciferase activity was induced at the beginning of DNA synthesis and was dependent on the presence of an E2F-binding site in the H2A.1 promoter. Together with the finding that E2F-binding motifs are highly conserved in H2A promoters of other species, our results suggest that E2F plays an important role in the coordinate regulation of S-phase-specific histone gene expression.

scholarly journals Grapes(Chk1) prevents nuclear CDK1 activation by delaying cyclin B nuclear accumulation

2008 ◽  
Vol 183 (1) ◽  
pp. 63-75 ◽  
Author(s):  
Anne Royou ◽  
Derek McCusker ◽  
Douglas R. Kellogg ◽  
William Sullivan
Keyword(s):  
Protein Synthesis ◽  
Drosophila Melanogaster ◽  
S Phase ◽  
Cyclin B ◽  
Nuclear Accumulation ◽  
Protein Synthesis Inhibitor ◽  
Cyclin Dependent Kinase ◽  
Synthesis Inhibitor ◽  
Checkpoint Kinase 1 ◽  
Nuclear Envelope Breakdown

Entry into mitosis is characterized by a dramatic remodeling of nuclear and cytoplasmic compartments. These changes are driven by cyclin-dependent kinase 1 (CDK1) activity, yet how cytoplasmic and nuclear CDK1 activities are coordinated is unclear. We injected cyclin B (CycB) into Drosophila melanogaster embryos during interphase of syncytial cycles and monitored effects on cytoplasmic and nuclear mitotic events. In untreated embryos or embryos arrested in interphase with a protein synthesis inhibitor, injection of CycB accelerates nuclear envelope breakdown and mitotic remodeling of the cytoskeleton. Upon activation of the Grapes(checkpoint kinase 1) (Grp(Chk1))-dependent S-phase checkpoint, increased levels of CycB drives cytoplasmic but not nuclear mitotic events. Grp(Chk1) prevents nuclear CDK1 activation by delaying CycB nuclear accumulation through Wee1-dependent and independent mechanisms.

Control of histone gene expression in Physarum polycephalum. I. Protein synthesis during the cell cycle

1982 ◽  
Vol 57 (1) ◽  
pp. 139-150
Author(s):  
P.N. Schofield ◽  
I.O. Walker
Keyword(s):  
Cell Cycle ◽  
Physarum Polycephalum ◽  
Specific Activity ◽  
S Phase ◽  
Histone Gene ◽  
Synchronous Cultures ◽  
Histone Gene Expression ◽  
Core Histones ◽  
G2 Phase ◽  
Histone Synthesis

Synchronous cultures of Physarum polycephalum were pulsed with [3H]lysine hydrochloride in S and G2 phases of the cell cycle. Plasmodial extracts were separated into nuclear, ribosomal and acid-soluble post-ribosomal cytoplasmic fractions. Core histones could be detected by staining in the nuclear fractions of both S and G2 phases, but were not detected by staining in the cytoplasmic fractions. Newly synthesized histone was present in S-phase nuclei but not in S-phase cytoplasm. The specific activity of newly synthesized histone in G2-phase nuclei decreased by at least 95% compared to S phase and no newly synthesized histone was observed in G2-phase cytoplasmic fractions. Thus histone synthesis is restricted to S phase. There are no free pools of histone in the cytoplasm of Physarum in either S or G2 phases of the cell cycle.

Regulation of histone mRNA in the unperturbed cell cycle: evidence suggesting control at two posttranscriptional steps

1991 ◽  
Vol 11 (5) ◽  
pp. 2416-2424
Author(s):  
M E Harris ◽  
R Böhni ◽  
M H Schneiderman ◽  
L Ramamurthy ◽  
D Schümperli ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Half Life ◽  
S Phase ◽  
Protein Synthesis Inhibitor ◽  
Mrna Levels ◽  
Histone Mrna ◽  
Synthesis Inhibitor ◽  
Processing Efficiency ◽  
Histone 3 ◽  
Cycle Regulation

The levels of histone mRNA increase 35-fold as selectively detached mitotic CHO cells progress from mitosis through G1 and into S phase. Using an exogenous gene with a histone 3' end which is not sensitive to transcriptional or half-life regulation, we show that 3' processing is regulated as cells progress from G1 to S phase. The half-life of histone mRNA is similar in G1- and S-phase cells, as measured after inhibition of transcription by actinomycin D (dactinomycin) or indirectly after stabilization by the protein synthesis inhibitor cycloheximide. Taken together, these results suggest that the change in histone mRNA levels between G1- and S-phase cells must be due to an increase in the rate of biosynthesis, a combination of changes in transcription rate and processing efficiency. In G2 phase, there is a rapid 35-fold decrease in the histone mRNA concentration which our results suggest is due primarily to an altered stability of histone mRNA. These results are consistent with a model for cell cycle regulation of histone mRNA levels in which the effects on both RNA 3' processing and transcription, rather than alterations in mRNA stability, are the major mechanisms by which low histone mRNA levels are maintained during G1.

scholarly journals Distinct replication-independent and -dependent phases of histone gene expression during the Physarum cell cycle.

1987 ◽  
Vol 7 (5) ◽  
pp. 1933-1937 ◽  
Author(s):  
J J Carrino ◽  
V Kueng ◽  
R Braun ◽  
T G Laffler
Keyword(s):  
Gene Expression ◽  
Cell Cycle ◽  
Dna Replication ◽  
Dna Synthesis ◽  
S Phase ◽  
Histone Gene ◽  
Histone Mrna ◽  
Histone Gene Expression ◽  
Tightly Coupled ◽  
G2 Phase

During the S phase of the cell cycle, histone gene expression and DNA replication are tightly coupled. In mitotically synchronous plasmodia of the myxomycete Physarum polycephalum, which has no G1 phase, histone mRNA synthesis begins in mid-G2 phase. Although histone gene transcription is activated in the absence of significant DNA synthesis, our data demonstrate that histone gene expression became tightly coupled to DNA replication once the S phase began. There was a transition from the replication-independent phase to the replication-dependent phase of histone gene expression. During the first phase, histone mRNA synthesis appears to be under direct cell cycle control; it was not coupled to DNA replication. This allowed a pool of histone mRNA to accumulate in late G2 phase, in anticipation of future demand. The second phase began at the end of mitosis, when the S phase began, and expression became homeostatically coupled to DNA replication. This homeostatic control required continuing protein synthesis, since cycloheximide uncoupled transcription from DNA synthesis. Nuclear run-on assays suggest that in P. polycephalum this coupling occurs at the level of transcription. While histone gene transcription appears to be directly switched on in mid-G2 phase and off at the end of the S phase by cell cycle regulators, only during the S phase was the level of transcription balanced with the rate of DNA synthesis.

scholarly journals Evidence for endogenous polypeptide-mediated inhibition of cell-cycle transit in human diploid cells.

1982 ◽  
Vol 94 (1) ◽  
pp. 187-192 ◽  
Author(s):  
G C Burmer ◽  
C J Zeigler ◽  
T H Norwood
Keyword(s):  
Cell Cycle ◽  
Protein Synthesis ◽  
Dna Synthesis ◽  
Tritiated Thymidine ◽  
Protein Synthesis Inhibitor ◽  
Synthesis Inhibitor ◽  
Human Diploid Fibroblasts ◽  
Senescent Phenotype ◽  
Human Diploid Cells ◽  
Diploid Cells

Previous studies have shown that the senescent phenotype is dominant with respect to DNA synthesis in fusions between late passage and actively replicating human diploid fibroblasts. Brief postfusion treatments with the protein synthesis inhibitor cycloheximide (CHX) or puromycin have been found to significantly delay (by 24-48 h) the inhibition of entry into DNA synthesis of young nuclei in heterokaryons after fusion with senescent cells. A significant fraction of the senescent nuclei incorporated tritiated thymidine in CHX-treated heterokaryons. The optimal duration of exposure to CHX was 1-3 h immediately after fusion, although treatments beginning as late as 9 h after fusion elevated the heterokaryon labeling index. Prefusion treatments with CHX were without a significant effect. These results are consistent with the interpretation that regulatory cell cycle inhibitor(s) which are dependent upon protein synthesis may be present in heterokaryons between senescent and actively replicating cells.

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