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BMP4 Promotes Mouse Ips Cell Differentiation to Male Germ Cells Via Smad1/5, Gata4, Id1 and Id2

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BMP4 Promotes Mouse Ips Cell Differentiation to Male Germ Cells Via Smad1/5, Gata4, Id1 and Id2 REPRODUCTIONRESEARCH BMP4 promotes mouse iPS cell differentiation to male germ cells via Smad1/5, Gata4, Id1 and Id2 Shi Yang1, Qingqing Yuan2, Minghui Niu2, Jingmei Hou2, Zijue Zhu3, Min Sun2, Zheng Li3 and Zuping He2,4,5,6 1Department of Urology, 2State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Human Sperm Bank, Shanghai, China, 3Department of Andrology, Urologic Medical Center, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, China, 4Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Institute of Andrology, Shanghai, China, 5Shanghai Key Laboratory of Assisted Reproduction and Reproductive Genetics, Shanghai, China and 6Shanghai Key Laboratory of Reproductive Medicine, Shanghai, China Correspondence should be addressed to Z He; Email: [email protected] Abstract Generation of male germ cells from pluripotent cells could provide male gametes for treating male infertility and offer an ideal model for unveiling molecular mechanisms of spermatogenesis. However, the influence and exact molecular mechanisms, especially downstream effectors of BMP4 signaling pathways, in male germ cell differentiation of the induce pluripotent stem (iPS) cells, remain unknown. This study was designed to explore the role and mechanism of BMP4 signaling in the differentiation of mouse iPS cells to male germ cells. Embryoid body (EB) formation and recombinant BMP4 or Noggin were utilized to evaluate the effect of BMP4 on male germ cell generation from mouse iPS cells. Germ cell-specific genes and proteins as well as the downstream effectors of BMP4 signaling pathway were assessed using real-time PCR and Western blots. We found that BMP4 ligand and its multiple receptors, including BMPR1a, BMPR1b and BMPR2, were expressed in mouse iPS cells. Real-time PCR and Western blots revealed that BMP4 could upregulate the levels of genes and proteins for germ cell markers in iPS cells-derived EBs, whereas Noggin decreased their expression in these cells. Moreover, Smad1/5 phosphorylation, Gata4 transcription and the transcripts of Id1 and Id2 were enhanced by BMP4 but decreased when exposed to Noggin. Collectively, these results suggest that BMP4 promotes the generation of male germ cells from iPS cells via Smad1/5 pathway and the activation of Gata4, Id1 and Id2. This study thus offers novel insights into molecular mechanisms underlying male germ cell development. Reproduction (2017) 153 211–220 Introduction kinds of roles in regulating the self-renewal of stem cells and developmental processes, including neural, In the last few years, several groups have shown that hematopoietic, cardiomyogenic and hepatic lineage embryonic stem (ES) cells and the induced pluripotent formation (Varga & Wrana 2005, Fei et al. 2010). As stem (iPS) cells can differentiate into male germ cells examples, BMPs are involved in directing both self- (Kee et al. 2009, Easley et al. 2012, Lim et al. 2014, renewal and differentiation of ES cells. BMPs, working Ramathal et al. 2014). We have previously demonstrated with LIF, maintain the self-renewal state of mouse ES that mouse iPS cells have the potential to give rise cells (Ying et al. 2003, Li et al. 2012). As a mesoderm to male germ cells in vitro (Yang et al. 2012, Li et al. inducer, BMPs induce both ES and iPS cells to 2013). Numerous studies have reported that bone differentiate to PGCs (Wei et al. 2008, Saitou & Yamaji morphogenetic proteins (BMPs) have essential function 2010, Panula et al. 2011). Interestingly, BMPs could in primordial germ cell (PGC) specification and germ cell efficiently coax germ cell generation from human ES or lineage commitment from pluripotent cells (Wei et al. iPS cells (Panula et al. 2011). BMPs can also regulate both 2008, Hiller et al. 2011). However, little is known spermatogonial proliferation and differentiation in vitro about the role and mechanisms of BMP4 signaling in or in vivo. For instance, BMP4 exerts both mitogenic and generating male germ cells from iPS cells. differentiation effect on undifferentiated spermatogonia BMPs belong to members of transforming growth (Hu et al. 2004, Itman & Loveland 2008). Collectively, as factor β (TGF-β) superfamily, and they play various © 2017 Society for Reproduction and Fertility DOI: 10.1530/REP-16-0292 ISSN 1470–1626 (paper) 1741–7899 (online) Online version via www.reproduction-online.org Downloaded from Bioscientifica.com at 10/05/2021 05:05:03PM via free access 10.1530/REP-16-0292 212 S Yang and others a pivotal factor, BMPs might be closely associated with medium according to the procedure as described previously ES or iPS cell differentiation into all three germ layers (Yang et al. 2012). Briefly, iPS cells were co-cultured on and eventually germ cells (Li & Chen 2013). feeder cells, namely irradiated mouse embryonic fibroblasts BMPs initiate the signal through binding to their (MEFs), in high glucose DMEM containing 15% fetal bovine multiple receptors, including transmembrane type I serum (FBS; Hyclone, Logan, UT, USA), 100 mg/mL leukemia receptors BMPR1a or BMPR1b and type II receptor inhibiting factor (LIF; Millipore), 100 U/mL penicillin plus BMPR2, which phosphorylates receptor-activated 100 mg/mL streptomycin (Gibco), 2 mM L-glutamine (Gibco), Smads (R-Smads, Smad1/5/8) to form a complex with 0.1 mM β-mercaptoethanol (Gibco) and 0.1 mM non-essential common Smad (co-Smad and Smad4). The Smad amino acids (NEAA; Gibco). The cells were passaged every 2–3 days, and culture was maintained at 37°C in a humidified complex translocates into the nucleus and regulates incubator with 5% CO . downstream target gene expression through other DNA- 2 Embryoid bodies (EBs) were formed by hanging drop and binding factors and transcription factors in the nucleus suspension culture method as follows: iPS cells were digested (Shi & Massague 2003, Fei et al. 2010). Despite progress to become single cells and transferred to low-attachment in classical BMP4 signaling cascades, the influence and dishes containing the above culture medium without LIF. EBs exact molecular mechanisms, especially downstream were treated without or with 10, 50 and 100 ng/mL BMP4 effectors of BMP4 signaling pathways, in male germ (R&D) and/or 10, 50 and 100 ng/mL Noggin (R&D) for 7 days. cell differentiation of iPS cells, remain to be elucidated. The generation of male germ cells from iPS cells offers an ideal system for exploring molecular mechanisms RNA extraction, RT-PCR and quantitative real-time PCR underlying germline formation. To better understand the Total RNA was extracted from iPS cells and EBs derived from role and mechanisms of BMP4 signaling in regulating iPS cells using TRIzol (Invitrogen). After DNase treatment to the differentiation of iPS cells into male germ cells, here remove potential contamination with genomic DNA, 1 μg of we have for the first time examined the effect of BMP4 total RNA was transcribed into cDNA using First-Strand cDNA and its inhibitor Noggin on the male germ cell lineage Synthesis Kit (Fermentas, Waltham, MA, USA). PCR was commitment of mouse iPS cells. Moreover, we probed performed according to the protocol as described previously the expression, function and signaling transduction (Guo et al. 2015, Liu et al. 2015), and quantitative real-time pathway of BMP4 during the differentiation of iPS cells PCR was performed using SYBR Green master mix and a 7500 into male germ cells. Fast Real-Time PCR System (Applied Biosystems) pursuant to the method as described previously (Yang et al. 2014). The primer sequences of genes used for PCR and real-time PCR Materials and methods were designed and listed in Tables 1 and 2 respectively. Real- time PCR products were quantified using the comparative Ct Mouse iPS cells and EB culture with BMP4 (threshold cycle) method. The threshold of cycle values was and/or Noggin normalized against the threshold value of mouse Gapdh. The mouse iPS cell line (Tg-GFP-miPS11.1) was a kind gift from Prof. Ying Jin, Shanghai Jiao Tong University School of Immunocytochemistry Medicine, Shanghai, China. These iPS cells were generated from neural progenitor cells of EGFP transgenic C57BL/6J mice The expression of BMP4 and its receptors as well as via retroviral transfer of Oct4/Sox2/C-Myc/Klf4 (Li et al. 2009). germ cell-specific markers in EB cells was obtained by Notably, this cell line has been demonstrated to be germline immunocytochemistry according to the procedure described competent (Li et al. 2009). iPS cells were cultured in the previously (Liu et al. 2015). Briefly, iPS cells were fixed in 4% Table 1 Primers of genes used for RT-PCR. Genes Primer sequences Product size (bp) Tm (°C) Number of cycles Bmp4 Forward 5′-TAGTCCCAAGCATCACCC-3′ 354 56 35 Reverse 5′-TCTCAGCGGCATCCAC-3′ Bmpr1a Forward 5′-TCAGGGAGAAACCACAT-3′ 180 50 35 Reverse 5′-CTGCCATCAAAGAACG-3′ Bmpr1b Forward 5′-TGGATGGGAAAGTGGC-3′ 456 53 35 Reverse 5′-GGTGTTGGGTGGGATG-3′ Bmpr2 Forward 5′-GGAGCGAAATGAAGGG-3′ 470 53 35 Reverse 5′-CACCGATGTGAGACCAA-3′ Oct4 Forward 5′-ATGGCATACTGTGGACCTCA-3′ 236 58 35 Reverse 5′-AGCAGCTTGGCAAACTGTTC-3′ Sox2 Forward 5′-GCGGAGTGGAAACTTTTGTCC-3′ 156 60 35 Reverse 5′-GGGAAGCGTGTACTTATCCTTCT-3′ Nanog Forward 5′-TCGCCCTTCCTCTGAAGAC-3′ 195 60 35 Reverse 5′-TGCTTCTGAAACCTGTCCTTGA-3′ Gapdh Forward 5′-TCTCCTGCGACTTCAACA-3′ 178 55 35 Reverse 5′-TGGTCCAGGGTTTCTTACT-3′ Reproduction (2017) 153 211–220 www.reproduction-online.org Downloaded
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