NSSR1 is regulated in testes development and cryptorchidism and promotes the exon 5-included splicing of CREB transcripts.
Neural salient serine/arginine rich protein 1 (NSSR1, alternatively SRp38) is a newly identified splicing factor that is highly expressed in neural and reproductive tissues. We showed that the expression of testicular NSSR1 increased significantly during mouse testes development. NSSR1 was mainly expressed in germ cells, but barely detected in Sertoli cells. Testicular NSSR1 was mostly phosphorylated and cytosolic in germ cells. In comparison, pituitary NSSR1 was mostly dephosphorylated and nuclear. In the cryptorchid testes, the dephosphorylated NSSR1 was significantly increased. RT-PCR analysis demonstrated that the alternative splicing of CREB and CREM genes was altered in the cryptorchid testes. In addition, CREB transcripts were associated with NSSR1 either in testes tissues or cultured GC-1 cells. Moreover, the studies with NSSR1 over-expression or silence demonstrated that NSSR1 promoted the exon 5 inclusion of CREB, indicating that NSSR1 is a new factor that regulates the alternative exon 5 inclusion of CREB transcripts. The findings for the first time provide the evidence indicating the potential importance of NSSR1 in testes development, spermatogenesis and cryptorchidism.
Xiao
Ping-Jie
PJ
Laboratory of Genomic Physiology and State Key Laboratory of Medical Neurobiology, School of Life Sciences and Shanghai Medical College, Fudan University, Shanghai, China.
Hu
Lingchuan
L
Li
Jing
J
Lin
Wanming
W
Chen
Xianhua
X
Xu
Ping
P
D000818:Animals; D018797:Cell Cycle Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D003456:Cryptorchidism / Q000209:etiology* / Q000235:genetics / Q000378:metabolism; D051786:Cyclic AMP Response Element Modulator / Q000235:genetics; D017362:Cyclic AMP Response Element-Binding Protein / Q000235:genetics*; D003600:Cytosol / Q000737:chemistry / Q000378:metabolism; D005091:Exons; D018507:Gene Expression Regulation, Developmental; D047468:Immunoprecipitation; D008297:Male; D051379:Mice; D009363:Neoplasm Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D012326:RNA Splicing; D012333:RNA, Messenger / Q000032:analysis / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D012097:Repressor Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D013737:Testis / Q000254:growth & development* / Q000378:metabolism; D014158:Transcription, Genetic; D015854:Up-Regulation
D018797:Cell Cycle Proteins; C497411:Crem protein, mouse; D017362:Cyclic AMP Response Element-Binding Protein; C485446:Fusip1 protein, mouse; D009363:Neoplasm Proteins; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D012097:Repressor Proteins; D051786:Cyclic AMP Response Element Modulator