Abstract:
:Mitogen-activated protein (MAP) kinases are serine/threonine kinases that are rapidly activated in response to mitogenic stimuli. Here we examined the enzymatic activity and phosphorylation state of the individual p44mapk and p42mapk isoforms during early G1 and late G1 phase of the mammalian cell cycle. Release of fibroblast cells from early G1 block was accompanied by a rapid rise in the myelin basic protein (MBP) kinase activity of p44mapk and p42mapk, which declined slowly over several hours to reach negligible values as cells enter S phase. When cells were released from late G1 block, the activity of p44mapk and p42mapk increased transiently, and then rapidly declined to baseline values during G1 to S phase transition. Cells released at the G1/S boundary in a medium lacking growth factors entered S phase in the complete absence of MAP kinase activity. Unlike MAP kinases, the histone H1 kinase activity of p33cdk2 was elevated in late G1 arrested cells and continued to increase during S phase entry. The enzymatic activation of p44mapk and p42mapk in both early G1 and late G1 phase was accompanied by an increase in the phosphothreonine and phosphotyrosine content of the proteins. These findings suggest that the sustained activation of MAP kinases during G1 progression and their inactivation at the G1/S transition are two regulatory processes involved in the mitogenic response to growth factors.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Meloche Sdoi
10.1002/jcp.1041630319subject
Has Abstractpub_date
1995-06-01 00:00:00pages
577-88issue
3eissn
0021-9541issn
1097-4652journal_volume
163pub_type
杂志文章abstract::Recent findings point to low oxygen tension (hypoxia) as an important mechanism for the expression of several eukaryotic genes. We have previously shown that hypoxia (2% O2), when compared to standard oxygen tension (20% O2), upregulates the mRNA levels of the human alpha1(I) (COL1A1) procollagen gene and transforming...
journal_title:Journal of cellular physiology
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journal_title:Journal of cellular physiology
pub_type: 杂志文章,评审
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journal_title:Journal of cellular physiology
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doi:10.1002/jcp.1041490215
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abstract::Cultured bovine adrenocortical cells were previously shown to be functionally deficient in selenium and vitamin E when grown in medium supplemented with fetal bovine serum. In the present experiments, the lack of significant bioavailable amounts of selenium in the medium was demonstrated by the finding of only low lev...
journal_title:Journal of cellular physiology
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doi:10.1002/jcp.1041230106
更新日期:1985-04-01 00:00:00
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journal_title:Journal of cellular physiology
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abstract::The Pur proteins are an ancient family of sequence-specific single-stranded nucleic acid-binding proteins. They bind a G-rich element in either single- or double-stranded nucleic acids and are capable of displacing the complementary C-rich strand. Recently several reports have described Pur family member knockouts, mu...
journal_title:Journal of cellular physiology
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journal_title:Journal of cellular physiology
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journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.21509
更新日期:2008-11-01 00:00:00
abstract::Serum stimulation of quiescent 3T3 cells returns the cells to a proliferative state. Changes in Ca content, transport and distribution during the transition through G1 and S phase have been investigated following serum stimulation of these cells. 45 Ca exchange data indicate at least two kinetically defined cellular c...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1040950110
更新日期:1978-04-01 00:00:00
abstract::The effect of cell culture age and concomitant changes in cell density on the biosynthesis of sulfated-proteoglycan by rabbit articular chondrocytes in secondary monolayer culture was studied. Low density (LD, 2 d), middle density (MD, 5-7 d), and high density (HD, 12-15 d) cultures demonstrated changes in cellular mo...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041210315
更新日期:1984-12-01 00:00:00
abstract::Acute lung injury (ALI) is a severe acute inflammatory reaction of the lungs caused by a variety of factors, which can lead to a high mortality rate. MicroRNAs are a novel therapeutic molecule that play a vital role in many diseases. However, its mechanism of action in lipopolysaccharide (LPS)-induced mouse ALI is not...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.28850
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abstract::C1q/tumor necrosis factor-related protein-6 (CTRP6) is a newly identified adipokine involved in diverse biological processes. However, its role in salivary glands remains unknown. Here, we demonstrated that CTRP6 was mainly distributed in the nuclei, apicolateral membranes, and cytoplasm of human submandibular glands ...
journal_title:Journal of cellular physiology
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更新日期:2021-01-05 00:00:00
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更新日期:2019-08-01 00:00:00
abstract::Activation of hepatic progenitor cells (HPCs) is commonly observed in chronic liver disease and Wnt/β-catenin signaling plays a crucial role in the expansion of HPCs. However, the molecular mechanisms that regulate the activation of Wnt/β-catenin signaling in the liver, especially in HPCs, remain largely elusive. Here...
journal_title:Journal of cellular physiology
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doi:10.1002/jcp.24488
更新日期:2014-05-01 00:00:00
abstract::Formation of human T lymphocyte colonies in semisolid medium from T lymphocyte colony-forming units (TL-CFUs) under stimulation of phytohemagglutinin (PHA) has been reported by several authors. These TL-CFUs were present in unsensitized lymphocyte populations. We report here that such TL-CFUs are capable of renewing t...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041170114
更新日期:1983-10-01 00:00:00
abstract::To study the role of noncollagenous proteins in bone formation, the synthesis and tissue distribution of BSP (bone sialoprotein), OPN (osteopontin) and SPARC (secreted protein acidic and rich in cysteine) were analyzed using pulse-chase and continuous labeling protocols during bone formation by cultures of rat calvari...
journal_title:Journal of cellular physiology
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doi:10.1002/jcp.1041520305
更新日期:1992-09-01 00:00:00
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journal_title:Journal of cellular physiology
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journal_title:Journal of cellular physiology
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journal_title:Journal of cellular physiology
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journal_title:Journal of cellular physiology
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更新日期:2013-10-01 00:00:00
abstract::Biosynthesis of selenium-containing proteins requires insertion of the unusual amino acid selenocysteine by alternative translation of a UGA codon, which ordinarily serves as a stop codon. In eukaryotes, selenoprotein translation depends upon one or more selenocysteine insertion sequence (SECIS) elements located in th...
journal_title:Journal of cellular physiology
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abstract::Increases in cytoplasmic Ca(2+) are crucial for inducing the initial steps of myoblast differentiation that ultimately lead to fusion; yet the mechanisms that produce this elevated Ca(2+) have not been fully resolved. For example, it is still unclear whether the increase comes exclusively from membrane Ca(2+) influx o...
journal_title:Journal of cellular physiology
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abstract::Histone deacetylase 2 (HDAC2) catalyzes deacetylation of histones at the promoter and coding regions of transcribed genes and regulates chromatin structure and transcription. To explore the role of HDAC2 and phosphorylated HDAC2 in gene regulation, we studied the location along transcribed genes, the mode of recruitme...
journal_title:Journal of cellular physiology
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更新日期:2007-03-01 00:00:00
abstract::Ménière's disease (MD) is a disorder of the inner ear characterized by an insidious onset and aspecific symptoms, such as dizziness, vertigo, tinnitus, and hearing loss, that may become very debilitating. The presence of endolymphatic hydrops is a common feature in MD patients, but the pathophysiology is still largely...
journal_title:Journal of cellular physiology
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更新日期:2012-01-01 00:00:00