scholarly journals Regulation of type I (epidermal) transglutaminase mRNA levels during squamous differentiation: down regulation by retinoids.

1989 ◽  
Vol 9 (11) ◽  
pp. 4846-4851 ◽  
Author(s):  
E E Floyd ◽  
A M Jetten
Keyword(s):  
Retinoic Acid ◽  
Epithelial Cells ◽  
Cdna Clones ◽  
Type I ◽  
Mrna Levels ◽  
Type Ii ◽  
Squamous Differentiation ◽  
Tracheal Epithelial Cells ◽  
Tracheal Epithelial ◽  
Epidermal Transglutaminase

Squamous differentiation of rabbit tracheal epithelial cells is accompanied by an approximately 50-fold increase in the activity of type I (epidermal) transglutaminase, while the levels of type II (tissue) transglutaminase remain almost undetectable. To identify a cDNA encoding type I transglutaminase, we screened a library of cDNA clones prepared from poly(A)+ RNA isolated from squamous-differentiated rabbit tracheal epithelial cells. Four overlapping clones (represented by clone pTG-7) which span a range of 2.8 kilobases were identified; partial sequencing of pTG-7 indicated that it encodes a transglutaminaselike protein. pTG-7 hybridized to a 3.6-kilobase mRNA which is distinct from that for type II transglutaminase. pTG-7 mRNA levels were low in proliferative cells, increased dramatically in squamous-differentiated cells, and could be further enhanced by growth of the cells in high concentrations (2 mM) of calcium ions. Retinoic acid, which blocks the expression of the squamous phenotype, prevented this increase in pTG-7 mRNA levels. These changes in levels of pTG-7 mRNA parallel the changes in type I transglutaminase activity observed under similar culture conditions. These data indicate that pTG-7 encodes the mRNA for transglutaminase type I and that expression of this mRNA is negatively regulated by retinoic acid.

Regulation of type I (epidermal) transglutaminase mRNA levels during squamous differentiation: down regulation by retinoids

1989 ◽  
Vol 9 (11) ◽  
pp. 4846-4851
Author(s):  
E E Floyd ◽  
A M Jetten
Keyword(s):  
Retinoic Acid ◽  
Epithelial Cells ◽  
Cdna Clones ◽  
Type I ◽  
Mrna Levels ◽  
Type Ii ◽  
Squamous Differentiation ◽  
Tracheal Epithelial Cells ◽  
Tracheal Epithelial ◽  
Epidermal Transglutaminase

Squamous differentiation of rabbit tracheal epithelial cells is accompanied by an approximately 50-fold increase in the activity of type I (epidermal) transglutaminase, while the levels of type II (tissue) transglutaminase remain almost undetectable. To identify a cDNA encoding type I transglutaminase, we screened a library of cDNA clones prepared from poly(A)+ RNA isolated from squamous-differentiated rabbit tracheal epithelial cells. Four overlapping clones (represented by clone pTG-7) which span a range of 2.8 kilobases were identified; partial sequencing of pTG-7 indicated that it encodes a transglutaminaselike protein. pTG-7 hybridized to a 3.6-kilobase mRNA which is distinct from that for type II transglutaminase. pTG-7 mRNA levels were low in proliferative cells, increased dramatically in squamous-differentiated cells, and could be further enhanced by growth of the cells in high concentrations (2 mM) of calcium ions. Retinoic acid, which blocks the expression of the squamous phenotype, prevented this increase in pTG-7 mRNA levels. These changes in levels of pTG-7 mRNA parallel the changes in type I transglutaminase activity observed under similar culture conditions. These data indicate that pTG-7 encodes the mRNA for transglutaminase type I and that expression of this mRNA is negatively regulated by retinoic acid.

scholarly journals Molecular cloning of gene sequences regulated during squamous differentiation of tracheal epithelial cells and controlled by retinoic acid.

1987 ◽  
Vol 7 (11) ◽  
pp. 4017-4023 ◽  
Author(s):  
H L Smits ◽  
E E Floyd ◽  
A M Jetten
Keyword(s):  
Retinoic Acid ◽  
Epithelial Cells ◽  
Cdna Library ◽  
Transforming Growth Factor Beta ◽  
Transforming Growth Factor ◽  
Squamous Differentiation ◽  
Squamous Cells ◽  
Tracheal Epithelial Cells ◽  
Molecular Events ◽  
Tracheal Epithelial

A cDNA library was constructed from polyadenylated RNA present in squamous differentiated rabbit tracheal epithelial cells. Screening of the cDNA library was aimed at identifying RNAs that were abundant in squamous cells and expressed at low levels in undifferentiated cells. Two different recombinants were obtained containing inserts, 0.86 and 0.77 kilobases (kb) in size, that hybridized to mRNAs 1.0 and 1.25 kb in length. These RNAs were present at approximately 50-fold higher levels in squamous cells than in proliferative or confluent retinoic acid-treated cells. The increase in the levels of the 1.0- and 1.25-kb RNAs correlated closely with the onset of squamous differentiation and was not related to induction of terminal cell division. Treatment of rabbit tracheal epithelial cells with transforming growth factor beta, which induces squamous differentiation in these cells, also resulted in elevated levels of the 1.0- and 1.25-kb RNAs. The increased levels of these RNAs in squamous cells appeared to a large extent to be regulated at a posttranscriptional level. Retinoic acid not only inhibited the increase in the levels of the 1.0- and 1.25-kb RNAs but also reversed the expression of these RNAs in squamous cells. These results suggest that retinoic acid affects, directly or indirectly, molecular events that induce alterations in the posttranscriptional processing of the transcripts corresponding to the 1.0- and 1.25-kb RNAs.

Molecular cloning of gene sequences regulated during squamous differentiation of tracheal epithelial cells and controlled by retinoic acid

1987 ◽  
Vol 7 (11) ◽  
pp. 4017-4023
Author(s):  
H L Smits ◽  
E E Floyd ◽  
A M Jetten
Keyword(s):  
Retinoic Acid ◽  
Epithelial Cells ◽  
Cdna Library ◽  
Transforming Growth Factor Beta ◽  
Transforming Growth Factor ◽  
Squamous Differentiation ◽  
Squamous Cells ◽  
Tracheal Epithelial Cells ◽  
Molecular Events ◽  
Tracheal Epithelial

A cDNA library was constructed from polyadenylated RNA present in squamous differentiated rabbit tracheal epithelial cells. Screening of the cDNA library was aimed at identifying RNAs that were abundant in squamous cells and expressed at low levels in undifferentiated cells. Two different recombinants were obtained containing inserts, 0.86 and 0.77 kilobases (kb) in size, that hybridized to mRNAs 1.0 and 1.25 kb in length. These RNAs were present at approximately 50-fold higher levels in squamous cells than in proliferative or confluent retinoic acid-treated cells. The increase in the levels of the 1.0- and 1.25-kb RNAs correlated closely with the onset of squamous differentiation and was not related to induction of terminal cell division. Treatment of rabbit tracheal epithelial cells with transforming growth factor beta, which induces squamous differentiation in these cells, also resulted in elevated levels of the 1.0- and 1.25-kb RNAs. The increased levels of these RNAs in squamous cells appeared to a large extent to be regulated at a posttranscriptional level. Retinoic acid not only inhibited the increase in the levels of the 1.0- and 1.25-kb RNAs but also reversed the expression of these RNAs in squamous cells. These results suggest that retinoic acid affects, directly or indirectly, molecular events that induce alterations in the posttranscriptional processing of the transcripts corresponding to the 1.0- and 1.25-kb RNAs.

scholarly journals Type II iodothyronine deiodinase protein in chicken choroid plexus: additional perspectives on T3 supply in the avian brain

2004 ◽  
Vol 183 (1) ◽  
pp. 235-241 ◽  
Author(s):  
C H J Verhoelst ◽  
V M Darras ◽  
S A Roelens ◽  
G M Artykbaeva ◽  
S Van der Geyten
Keyword(s):  
Epithelial Cells ◽  
Choroid Plexus ◽  
Blood Brain Barrier ◽  
Brain Barrier ◽  
Type I ◽  
Mrna Levels ◽  
Type Ii ◽  
Iodothyronine Deiodinase ◽  
Blood Brain ◽  
D2 Protein

It is widely accepted that type II iodothyronine deiodinase (D2) is mostly present in the brain, where it maintains the homeostasis of thyroid hormone (TH) levels. Although intensive studies have been performed on activity and mRNA levels of the deiodinases, very little is known about their expression at the protein level due to the lack of specific antisera. The current study reports the production of a specific D2 polyclonal antiserum and its use in the comparison of D2 protein distribution with that of type I (D1) and type III (D3) deiodinase protein in the choroid plexus at the blood–brain barrier level. Immunocytochemistry showed very high D2 protein expression in the choroid plexus, especially in the epithelial cells, whereas the D1 and D3 proteins were absent. Furthermore, dexamethasone treatment led to an up-regulation of the D2 protein in the choroid plexus. The expression of D2 protein in the choroid plexus led to a novel insight into the working mechanism of the uptake and transport of thyroid hormones along the blood–brain barrier in birds. It is hypothesized that D2 allows the prohormone thyroxine (T4) to be converted into the active 3,5,3′-triiodothyronine (T3). Within the choroidal epithelial cells. T3 is subsequently bound to its carrier protein, transthyretin (TTR), to allow transport through the cerebrospinal fluid. Neurons can thus not only be provided with a sufficient T3 level via the aid of the astrocytes, as was hypothesized previously based on in situ hybridization data, but also by means of T4 deiodination by D2, directly at the blood–brain barrier level.

Temporal/spatial expression of nuclear receptor coactivators in the mouse lung

2000 ◽  
Vol 279 (6) ◽  
pp. L1066-L1074 ◽  
Author(s):  
Angela Naltner ◽  
Susan Wert ◽  
Jeffrey A. Whitsett ◽  
Cong Yan
Keyword(s):  
Retinoic Acid ◽  
Epithelial Cells ◽  
Nuclear Receptor ◽  
Binding Protein ◽  
Mouse Lung ◽  
Alveolar Type ◽  
Type I ◽  
Type Ii ◽  
Creb Binding Protein ◽  
Nuclear Receptor Coactivators

Our laboratory has previously demonstrated that retinoic acid nuclear receptor, thyroid transcription factor-1 (TTF-1), and nuclear receptor coactivators such as cAMP response element binding protein (CREB) binding protein (CBP)/p300 and steroid receptor coactivator-1 (SRC-1) form an enhanceosome on the 5′-enhancer region of the human surfactant protein B gene. Immunohistochemistry was used to identify cells that coexpressed CBP/p300, SRC-1, retinoid X receptor, and TTF-1 in the developing and mature lung. CBP/p300 and SRC-1 were expressed in the adult mouse lung, CBP and p300 being present in both alveolar type I and type II epithelial cells and SRC-1 and TTF-1 being restricted to type II epithelial cells. CBP/p300, SRC-1, and TTF-1 were readily detected in the nuclei of developing respiratory epithelial tubules in fetal mice from embryonic days 10 to 18.CBP/p300 and SRC-1 were also detected in developing mesenchymal cells. These coactivators were coexpressed with TTF-1 and SP-B in human pulmonary adenocarcinoma cells (H441 cells) in vitro. Interaction assays with a two-hybrid reporter analysis demonstrated direct interactions among TTF-1, SRC-1, and CBP/p300 in H441 cells. These findings support a role for retinoic acid receptor and nuclear receptor coactivators in the regulation of SP-B gene expression in the respiratory epithelium.

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