Lycopene-derived bioactive retinoic acid receptors/retinoid-X receptors-activating metabolites may be relevant for lycopene's anti-cancer potential

2013 ◽  
Vol 57 (5) ◽  
pp. 739-747 ◽  
Author(s):  
Gamze Aydemir ◽  
Yasamin Kasiri ◽  
Eszter Birta ◽  
Gabriella Béke ◽  
Ada L. Garcia ◽  
...  
Keyword(s):  
Retinoic Acid ◽  
Retinoic Acid Receptors ◽  
Retinoid X Receptors ◽  
Anti Cancer ◽  
X Receptors

scholarly journals Multiple retinoid-responsive receptors in a single cell: families of retinoid "X" receptors and retinoic acid receptors in the Xenopus egg.

1992 ◽  
Vol 89 (6) ◽  
pp. 2321-2325 ◽  
Author(s):  
B. Blumberg ◽  
D. J. Mangelsdorf ◽  
J. A. Dyck ◽  
D. A. Bittner ◽  
R. M. Evans ◽  
...  
Keyword(s):  
Retinoic Acid ◽  
Single Cell ◽  
Retinoic Acid Receptors ◽  
Retinoid X Receptors ◽  
Xenopus Egg ◽  
X Receptors

Retinoic acid receptors and retinoid X receptors in the mature retina: Subtype determination and cellular distribution

1999 ◽  
Vol 19 (4) ◽  
pp. 338-347 ◽  
Author(s):  
Jacques J.M. Janssen ◽  
Eleonoor D. Kuhlmann ◽  
Anke H.M. van Vugt ◽  
Huub J. Winkens ◽  
Bert P.M. Janssen ◽  
...  
Keyword(s):  
Retinoic Acid ◽  
Retinoic Acid Receptors ◽  
Cellular Distribution ◽  
Retinoid X Receptors ◽  
X Receptors

Retinoid receptors promote primary neurogenesis in Xenopus

Development ◽  
1997 ◽  
Vol 124 (2) ◽  
pp. 515-523 ◽  
Author(s):  
C.R. Sharpe ◽  
K. Goldstone
Keyword(s):  
Retinoic Acid ◽  
Nuclear Hormone Receptor ◽  
Retinoic Acid Receptors ◽  
Primary Neurons ◽  
Retinoid X Receptors ◽  
Over Expression ◽  
Retinoid Receptors ◽  
X Receptors ◽  
Synthetic Mrna ◽  
Primary Neurogenesis

Retinoid receptors, which are members of the nuclear hormone receptor superfamily, act as ligand-dependent transcription factors. They mediate the effects of retinoic acid primarily as heterodimers of retinoic acid receptors (RARs) and retinoid X receptors (RXRs). To analyse their function, xRXR beta synthetic mRNA was injected into Xenopus embryos in combination with normal and mutated xRAR alpha transcripts. Two informative phenotypes are reported here. Firstly, over-expression of xRXR beta with xRAR alpha results in the formation of ectopic primary neurons. Secondly, blocking retinoid signalling with a mutated xRAR alpha results in a lack of primary neurons. These two phenotypes, from contra-acting manipulations, indicate a role for retinoid signalling during neurogenesis.

Terminal differentiation in keratinocytes involves positive as well as negative regulation by retinoic acid receptors and retinoid X receptors at retinoid response elements

1992 ◽  
Vol 12 (11) ◽  
pp. 4862-4871
Author(s):  
B J Aneskievich ◽  
E Fuchs
Keyword(s):  
Retinoic Acid ◽  
Terminal Differentiation ◽  
Cell Types ◽  
Epidermal Differentiation ◽  
Retinoic Acid Receptors ◽  
Keratinocyte Differentiation ◽  
Epidermal Keratinocytes ◽  
Retinoid X Receptors ◽  
Response Elements ◽  
X Receptors

Terminal differentiation of epidermal keratinocytes is inhibited by 1 microM retinoic acid, a concentration which induces differentiation in a number of cell types, including F9 teratocarcinoma cells. The molecular basis for these opposing retinoid responses is unknown, although retinoic acid receptors (RARs) and retinoid X receptors (RXRs) have been detected in both cell types. When F9 cells are stably transfected with a truncated RAR alpha lacking the E/F domain necessary for ligand binding and RAR/RXR dimerization, action at retinoid response elements is suppressed and cells produce a retinoic acid-resistant phenotype; i.e., they are blocked in differentiation (A. S. Espeseth, S. P. Murphy, and E. Linney, Genes Dev. 3:1647-1656, 1989). If retinoid receptors influence epidermal differentiation only in a negative fashion, then suppression of transactivation at retinoid response elements would be expected to enhance, rather than block, keratinocyte differentiation. In this study, we show that surprisingly, even though constitutive expression of an analogous truncated RAR gamma in keratinocytes specifically suppressed transactivation at retinoid response elements, keratinocytes were blocked, rather than enhanced, in their ability to undergo morphological and biochemical features of differentiation. These findings demonstrate a direct and hitherto unrecognized role for RARs and RXRs in positively as well as negatively regulating epidermal differentiation. Additionally, our studies extend those of Espeseth et al. (Genes Dev. 3:1647-1656, 1989), indicating a novel RAR function independent of the E/F domain.

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