title: A 5'-flanking region of gonadotropin-regulated testicular RNA helicase (GRTH/DDX25) gene directs its cell-specific androgen-regulated gene expression in testicular germ cells.
abstract: Gonadotropin-regulated testicular RNA helicase (GRTH/Ddx25) is a posttranscriptional regulator of genes that are essential for spermatid elongation and completion of spermatogenesis. It also prevents Leydig cells (LCs) from gonadotropin overstimulation of androgen production. In transgenic (Tg) mice carrying deletions of the GRTH 5'-flanking regions, we previously demonstrated that the -1085 bp to ATG contains the elements for basal and androgen-induced LC-specific expression. No expression in germ cells (GCs) was found with sequences extended up to -3.6 kb. To define regulatory regions of GRTH required for expression in GC, Tg mice were generated with 5'-flanking sequence 6.4 kb (6.4 Kb-Tg) and/or deletion using green fluorescent protein (GFP) as reporter gene in the present study. GFP was expressed in all lines. Immunohistochemistry analysis showed that 6.4 Kb-Tg directed GFP expression in both GCs and LCs. Deletion of the sequence -205 bp to -3.6 kb (6.4 Kb/del-Tg) directs GFP expression only in meiotic and haploid GCs. This indicated that the distal region -6.4 kb/-3.6 kb is required for GRTH cell-specific expression in GC. Also, it inhibits the expression of GRTH in LC directed by the 205-bp promoter, an effect that is neutralized by the -3.6-kb/-205-bp sequence. Androgen receptor antagonist, flutamide treatment prevents GFP/GRTH expression in Tg lines, demonstrating in vivo direct and indirect effects of endogenous androgen on LCs and GCs, respectively. Our studies have generated and characterized Tg lines that can be used to define requirements for cell-specific expression of the GRTH gene and to further advance our knowledge on the regulation of GRTH by androgen in GCs.
authors.affiliation: Section on Molecular Endocrinology, National Institutes of Health, Building 49, 6A36, Bethesda, Maryland 20892, USA.
authors.forename: Raghuveer
authors.initials: R
authors.lastname: Kavarthapu
authors.forename: Chon-Hwa
authors.initials: CH
authors.lastname: Tsai-Morris
authors.forename: Masato
authors.initials: M
authors.lastname: Fukushima
authors.forename: James
authors.initials: J
authors.lastname: Pickel
authors.forename: Maria L
authors.initials: ML
authors.lastname: Dufau
mesh_terms: D024506:5' Flanking Region / Q000235:genetics*; D000726:Androgen Antagonists / Q000494:pharmacology; D000728:Androgens / Q000494:pharmacology; D000818:Animals; D015153:Blotting, Western; D053487:DEAD-box RNA Helicases / Q000235:genetics* / Q000378:metabolism; D005485:Flutamide / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D005854:Germ Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D006062:Gonadotropins / Q000494:pharmacology; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D007150:Immunohistochemistry; D007985:Leydig Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D013737:Testis / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*
chemical_list: D000726:Androgen Antagonists; D000728:Androgens; D006062:Gonadotropins; D049452:Green Fluorescent Proteins; D005485:Flutamide; C487765:Ddx25 protein, mouse; D053487:DEAD-box RNA Helicases
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