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Article (Scientific journals)
A one-nucleotide difference in a cAMP and phorbol ester response element leads to differential regulation of the human chorionic somatomammotropin A and B gene transcription
Oury, Cécile; Alsat, E.; Jacquemin, P. et al.
1997In Journal of Molecular Endocrinology, 18 (2), p. 87-99
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Keywords :
Cell Line; Cloning, Molecular; Cyclic AMP/*genetics/metabolism; DNA, Recombinant; Female; Gene Expression Regulation/drug effects/*genetics; Gene Transfer Techniques; Genetic Vectors/isolation & purification; Hela Cells; Humans; Placental Lactogen/*genetics/metabolism; Promoter Regions, Genetic/drug effects/*genetics; Protein Binding; Tetradecanoylphorbol Acetate/*pharmacology; Transcription, Genetic/drug effects
Abstract :
[en] Human chorionic somatomammotropin (hCS) is encoded by two highly related genes, hCS-A and hCS-B, located in the hGH/hCS gene locus. Both genes are expressed in the syncytiotrophoblast layer of the placenta and hCS release from trophoblast cells is known to be increased by cAMP and phorbol esters. However, it remains unclear whether this regulation acts at the level of hCS gene expression or secretion and whether both genes are affected. We examined the effects of cAMP and phorbol 12-myristate 13-acetate (PMA) on the transcription of the hCS-A and hCS-B genes. Transient expression experiments revealed a 7 bp cAMP- and PMA-responsive element (CRElhCS-A) spanning nucleotides-1102 to -1096 upstream of the hCS-A gene. In contrast, the homologous sequence upstream of hCS-B (CRElhCS-B), differing from CRElhCS-A by a single substitution, shows little or no response to cAMP. In band-shift assays, the CRElhCS-A oligonucleotide was shown to bind two factors related to CREBP and AP-1, whereas CRElhCS-B only competes for one of these complexes. Finally, Southwestern analysis revealed that the CRElhCS-A element binds two ubiquitous proteins of 100 kDa and 47 kDa respectively, whereas CRElhCS-B interacts only with the 47 kDa protein. Taken together, these results suggest that a 47 kDa protein binding to the CRElhCS-A and CRElhCS-B elements is involved in the PMA response of the hCS-A and hCS-B genes, and a 100 kDa protein plays a crucial role in cAMP regulation of the hCS-A gene.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Oury, Cécile  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > GIGA-R : Génétique générale et humaine
Alsat, E.
Jacquemin, P.
Evain-Brion, D.
Martial, Joseph ;  Université de Liège - ULiège > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire
Muller, Marc  ;  Université de Liège - ULiège > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire
Language :
English
Title :
A one-nucleotide difference in a cAMP and phorbol ester response element leads to differential regulation of the human chorionic somatomammotropin A and B gene transcription
Publication date :
1997
Journal title :
Journal of Molecular Endocrinology
ISSN :
0952-5041
eISSN :
1479-6813
Publisher :
Society for Endocrinology, Bristol, United Kingdom
Volume :
18
Issue :
2
Pages :
87-99
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 August 2009

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