scholarly journals Regulation of type I collagen mRNA levels in fibroblasts

1986 ◽  
Vol 157 (2) ◽  
pp. 433-439 ◽  
Author(s):  
Tilman VOSS ◽  
Paul BORNSTEIN
Keyword(s):  
Type I Collagen ◽  
Type I ◽  
Mrna Levels ◽  
Collagen Mrna

scholarly journals Regulation of type I collagen mRNA in lung fibroblasts by cystine availability

1998 ◽  
Vol 331 (2) ◽  
pp. 417-422 ◽  
Author(s):  
David C. RISHIKOF ◽  
Ping-Ping KUANG ◽  
Christine POLIKS ◽  
Ronald H. GOLDSTEIN
Keyword(s):  
Amino Acids ◽  
Steady State ◽  
Amino Acid ◽  
Type I Collagen ◽  
State Level ◽  
Lung Fibroblasts ◽  
Type I ◽  
Mrna Levels ◽  
Collagen Mrna ◽  
Amino Acid Availability

The steady-state level of α1(I) collagen mRNA is regulated by amino acid availability in human lung fibroblasts. Depletion of amino acids decreases α1(I) collagen mRNA levels and repletion of amino acids induces rapid re-expression of α1(I) mRNA. In these studies, we examined the requirements for individual amino acids on the regulation of α1(I) collagen mRNA. We found that re-expression of α1(I) collagen mRNA was critically dependent on cystine but not on other amino acids. However, the addition of cystine alone did not result in re-expression of α1(I) collagen mRNA. Following amino acid depletion, the addition of cystine with selective amino acids increased α1(I) collagen mRNA levels. The combination of glutamine and cystine increased α1(I) collagen mRNA levels 6.3-fold. Methionine or a branch-chain amino acid (leucine, isoleucine or valine) also acted in combination with cystine to increase α1(I) collagen mRNA expression, whereas other amino acids were not effective. The prolonged absence of cystine lowered steady-state levels of α1(I) collagen mRNA through a mechanism involving decreases in both the rate of gene transcription as assessed by nuclear run-on experiments and mRNA stability as assessed by half-life determination in the presence of actinomycin D. The effect of cystine was not mediated via alterations in the level of glutathione, the major redox buffer in cells, as determined by the addition of buthionine sulphoximine, an inhibitor of γ-glutamylcysteine synthetase. These data suggest that cystine directly affects the regulation of α1(I) collagen mRNA.

Collagen expression in embryonic chicken chondrocytes treated with phorbol myristate acetate

1985 ◽  
Vol 5 (6) ◽  
pp. 1415-1424
Author(s):  
M H Finer ◽  
L C Gerstenfeld ◽  
D Young ◽  
P Doty ◽  
H Boedtker
Keyword(s):  
Morphological Change ◽  
Type I Collagen ◽  
Late Phase ◽  
Tumor Promoter ◽  
Type I ◽  
Mrna Levels ◽  
Type Ii ◽  
Collagen Mrna ◽  
Type I Procollagen ◽  
Embryonic Chicken

Growth of embryonic chicken sternal chondrocytes in the presence of phorbol-12-myristate-13-acetate (PMA), a potent tumor promoter, resulted in a dramatic morphological change from spherical floating cells to adherent fibroblastic cells. This morphological change was accompanied by a quantitative switch from synthesis of cartilage-specific type II procollagen to type I procollagen. Type II procollagen mRNA levels decreased 10-fold in PMA-treated cells. Activation of type I collagen genes led to the accumulation of type I procollagen mRNA levels comparable to those of type II mRNA in these cells. However, only type I procollagen mRNA was translated. In addition to gene activation, unprocessed pro alpha 1(I) transcripts present at low levels in control chondrocytes were processed to mature mRNA species. Redifferentiation of PMA-treated chondrocytes was possible if cells were removed from PMA after the morphological change and cessation of type II procollagen synthesis but before detectable amounts of type I procollagen were synthesized. Production of type I collagen thus marks a late phase of chondrocyte "dedifferentiation" from which reversion is no longer possible. Redifferentiated cell populations contained 24-fold more pro alpha 1(II) collagen mRNA than pro alpha 1(I) collagen mRNA, but the rates of procollagen synthesis were comparable. This suggests that the PMA-mediated dedifferentiation of chondrocytes as well as their redifferentiation is under both transcriptional and posttranscriptional regulation.

scholarly journals Altered beta-actin gene expression in phorbol myristate acetate-treated chondrocytes and fibroblasts.

1985 ◽  
Vol 5 (6) ◽  
pp. 1425-1433 ◽  
Author(s):  
L C Gerstenfeld ◽  
M H Finer ◽  
H Boedtker
Keyword(s):  
Steady State ◽  
Type I Collagen ◽  
Type Ii Collagen ◽  
Tumor Promoter ◽  
Type I ◽  
Mrna Levels ◽  
Collagen Mrna ◽  
Beta Actin ◽  
Steady State Levels ◽  
Actin Mrna

Phorbol-12-myristate-13-acetate (PMA), a potent tumor promoter, was shown to have opposite effects on the cellular morphology and steady-state levels of beta-actin mRNA in embryonic chicken muscle fibroblasts and sternal chondrocytes. When fibroblasts were treated with PMA, they formed foci of densely packed cells, ceased to adhere to culture plates, and had significantly reduced levels of beta-actin mRNA and protein. Conversely, when treated with PMA, floating chondrocytes attached to culture dishes, spread out, and began to accumulate high levels of beta-actin mRNA and proteins. In the sternal chondrocytes the stimulation of the beta-actin mRNA production was accompanied by increased steady-state levels of fibronectin mRNAs and protein. These alterations were concomitant with a fivefold reduction in type II collagen mRNA and a cessation in its protein production. After fibronectin and actin mRNAs and proteins reached their maximal levels, type I collagen mRNA and protein synthesis were turned on. Removal of PMA resulted in reduced beta-actin mRNA levels in chondrocytes and in a further alteration in the cell morphology. These observed correlations between changes in cell adhesion and morphology and beta-actin expression suggest that the effect of PMA on cell shape and adhesion may result in changes in the microfilament organization of the cytoskeleton which ultimately lead to changes in the extracellular matrix produced by the cells.

Relationships between mesangial cell proliferation and types I and IV collagen mRNA levels in vitro

1995 ◽  
Vol 269 (3) ◽  
pp. C554-C562 ◽  
Author(s):  
C. J. He ◽  
L. J. Striker ◽  
M. Tsokos ◽  
C. W. Yang ◽  
E. P. Peten ◽  
...  
Keyword(s):  
Type I Collagen ◽  
Mesangial Cell ◽  
Mesangial Cells ◽  
Methyl Cellulose ◽  
Collagen Gel ◽  
Type I ◽  
Mrna Levels ◽  
Collagen Mrna ◽  
Type Iv

Changes in the composition of the mesangial extracellular matrix (ECM) and cell turnover are present in glomerular disease. To determine if ECM changes play a role in perpetuating mesangial cell dysfunction, we examined a line of mouse mesangial cells cultured on films or gels of several ECM components and also on methyl cellulose, an inert substrate that prevents attachment. Cells on films of fibronectin or type IV or I collagen had persistently high growth rates and high levels of alpha 1-I and alpha 1-IV collagen mRNAs. In contrast, on gels of type IV or I collagen or matrigel, the growth rate was low. The alpha 1-IV collagen mRNA levels were low on type IV collagen gel or matrigel, whereas the alpha 1-I collagen mRNA levels remained high. In contrast, the alpha 1-I collagen mRNA levels were low on type I collagen gel, and the alpha 1-IV collagen mRNA levels were high. Cells on methyl cellulose formed floating aggregates, did not proliferate, and had a 5- to 10-fold decrease in both alpha 1-I and alpha 1-IV collagen mRNA levels. These phenotypic changes were largely reversible. Finally, when matrigel was layered over cells on fibronectin films, alpha 1-IV collagen mRNA levels decreased, but alpha 1-I collagen mRNA levels and proliferation remained high. Thus proliferation and alpha 1-I and alpha 1-IV collagen mRNA levels in mesangial cells were independently regulated and depended on attachment and the nature of the adjacent matrix.

scholarly journals The protein phosphatase inhibitor okadaic acid suppresses type I collagen gene expression in cultured fibroblasts at the transcriptional level

1995 ◽  
Vol 308 (3) ◽  
pp. 995-999 ◽  
Author(s):  
J Westermarck ◽  
E Ilvonen ◽  
V M Kähäri
Keyword(s):  
Gene Expression ◽  
Type I Collagen ◽  
Protein Phosphatases ◽  
Type I ◽  
Collagen Gene ◽  
Mrna Levels ◽  
Collagen Mrna ◽  
Collagen Gene Expression ◽  
Nih 3T3 ◽  
Collagen Promoter

Type I collagen is the most abundant component of the extracellular matrix of human connective tissues. We have examined the effect of okadaic acid (OA), an inhibitor of phosphoserine- and-phosphothreonine-specific protein phosphatases 1 and 2A, on type I collagen gene expression by fibroblasts in culture. Treatment of human skin fibroblasts with OA potently reduced type I and type III collagen mRNA levels, maximally by over 90%. The inhibitory effect of OA on type I and III collagen mRNA abundance was not prevented by cycloheximide, and was not affected by simultaneous treatment with dexamethasone or retinoic acid. OA also abrogated the enhancing effect of transforming growth factor-beta (TGF-beta) on type I and III collagen mRNA levels. Treatment of transiently transfected NIH-3T3 fibroblasts with OA suppressed the activity of a 3.5 kb human pro alpha 2(I) collagen promoter/chloramphenicol acetyltransferase construct maximally, by 70%. In addition, OA treatment of NIH-3T3 cells abrogated enhancement of pro alpha 2(I) collagen promoter activity by TGF-beta. These results indicate that protein phosphatases 1 and 2A have an important role as positive regulators of type I and III collagen gene expression. The results also suggest that selective inhibition of activity of protein phosphatases 1 and 2A may offer a novel approach for preventing excessive collagen accumulation in fibrotic disorders.

scholarly journals Effect of Fish Collagen Hydrolysates on Type I Collagen mRNA Levels of Human Dermal Fibroblast Culture

Marine Drugs ◽  
2018 ◽  
Vol 16 (5) ◽  
pp. 144 ◽  
Author(s):  
Ana Sanchez ◽  
Maria Blanco ◽  
Begoña Correa ◽  
Ricardo I. Perez-Martin ◽  
Carmen Sotelo
Keyword(s):  
Type I Collagen ◽  
Dermal Fibroblast ◽  
Human Dermal Fibroblast ◽  
Fibroblast Culture ◽  
Type I ◽  
Mrna Levels ◽  
Collagen Mrna ◽  
Fish Collagen ◽  
Collagen Hydrolysates

Altered beta-actin gene expression in phorbol myristate acetate-treated chondrocytes and fibroblasts

1985 ◽  
Vol 5 (6) ◽  
pp. 1425-1433
Author(s):  
L C Gerstenfeld ◽  
M H Finer ◽  
H Boedtker
Keyword(s):  
Steady State ◽  
Type I Collagen ◽  
Type Ii Collagen ◽  
Tumor Promoter ◽  
Type I ◽  
Mrna Levels ◽  
Collagen Mrna ◽  
Beta Actin ◽  
Steady State Levels ◽  
Actin Mrna

Phorbol-12-myristate-13-acetate (PMA), a potent tumor promoter, was shown to have opposite effects on the cellular morphology and steady-state levels of beta-actin mRNA in embryonic chicken muscle fibroblasts and sternal chondrocytes. When fibroblasts were treated with PMA, they formed foci of densely packed cells, ceased to adhere to culture plates, and had significantly reduced levels of beta-actin mRNA and protein. Conversely, when treated with PMA, floating chondrocytes attached to culture dishes, spread out, and began to accumulate high levels of beta-actin mRNA and proteins. In the sternal chondrocytes the stimulation of the beta-actin mRNA production was accompanied by increased steady-state levels of fibronectin mRNAs and protein. These alterations were concomitant with a fivefold reduction in type II collagen mRNA and a cessation in its protein production. After fibronectin and actin mRNAs and proteins reached their maximal levels, type I collagen mRNA and protein synthesis were turned on. Removal of PMA resulted in reduced beta-actin mRNA levels in chondrocytes and in a further alteration in the cell morphology. These observed correlations between changes in cell adhesion and morphology and beta-actin expression suggest that the effect of PMA on cell shape and adhesion may result in changes in the microfilament organization of the cytoskeleton which ultimately lead to changes in the extracellular matrix produced by the cells.

Increased type I collagen mRNA levels in cultured scleroderma fibroblasts

1984 ◽  
Vol 781 (1-2) ◽  
pp. 183-186 ◽  
Author(s):  
Veli-Matti Kähäri ◽  
Tuula Vuorio ◽  
Kirsti Näntö-Salonen ◽  
Eero Vuorio
Keyword(s):  
Type I Collagen ◽  
Type I ◽  
Mrna Levels ◽  
Collagen Mrna

scholarly journals Changes in the expression of collagen genes show two stages in chondrocyte differentiation in vitro

1988 ◽  
Vol 106 (2) ◽  
pp. 461-467 ◽  
Author(s):  
P Castagnola ◽  
B Dozin ◽  
G Moro ◽  
R Cancedda
Keyword(s):  
Suspension Culture ◽  
Type I Collagen ◽  
Relative Rate ◽  
Chondrocyte Differentiation ◽  
Type I ◽  
Mrna Levels ◽  
Type X Collagen ◽  
Collagen Mrna ◽  
Collagen Genes

This report deals with the quantitation of both mRNA and transcription activity of type I collagen gene and of three cartilage-specific collagens (types II, IX, and X) during in vitro differentiation of chick chondrocytes. Differentiation was obtained by transferal to suspension culture of dedifferentiated cells passaged for 3 wk as adherent cells. The type I collagen mRNA, highly represented in the dedifferentiated cells, rapidly decreased during chondrocyte differentiation. On the contrary, types II and IX collagen mRNAs sharply increased within the first week of suspension culture, peaked in the second week, and thereafter began to decrease. This decrease was particularly significant for type IX collagen mRNA. The level of type X collagen mRNA progressively increased during the course of the culture, reached its maximal value after 3-4 wk, and decreased only at a later stage of cell differentiation. As determined by in vitro run-off transcription assays, all these changes in collagen mRNA levels could be attributed to parallel modifications in the relative rate of transcription of the corresponding collagen genes. We suggest that chicken chondrocyte differentiation proceeds through at least two different steps: (a) first, transition from a stage characterized by a high level of type I collagen mRNA to a stage characterized by predominance of types II and IX collagen mRNAs; (b) later, transition to a stage characterized by the highest level of type X collagen mRNA.

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