Bone morphogenetic protein 4 promotes mammalian oogonial stem cell differentiation via Smad1/5/8 signaling  Eun-Sil Park, Ph.D., Dori C. Woods, Ph.D.,

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Bone morphogenetic protein 4 promotes mammalian oogonial stem cell differentiation via Smad1/5/8 signaling  Eun-Sil Park, Ph.D., Dori C. Woods, Ph.D., Jonathan L. Tilly, Ph.D.  Fertility and Sterility  Volume 100, Issue 5, Pages 1468-1475.e2 (November 2013) DOI: 10.1016/j.fertnstert.2013.07.1978 Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

Figure 1 (A) Detection of Bmpr1a, Bmpr1b, and Bmpr2 mRNAs in cultured OSCs (no RT, PCR analysis of RNA sample without RT used as a negative control to exclude genomic DNA contamination; β-actin, internal sample loading control). (B–D) Representative immunofluorescence-based detection of BMPR1A, BMPR1B, and BMPR2 proteins (green) in cultured OSCs counterstained with DAPI (blue) to visualize nuclear DNA (scale bars, 10 μm). Fertility and Sterility 2013 100, 1468-1475.e2DOI: (10.1016/j.fertnstert.2013.07.1978) Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

Figure 2 (A–C) Effect of BMP4 and Noggin, alone (A, B) or in combination (C), on numbers of IVD oocytes formed per well of 2.5 × 104 OSCs after 16 hours of treatment (mean ± SEM, n = 3–4 independent cultures; different letters, P<.05). (D) Lack of effect of BMP4 (100 ng/mL) and Noggin (150 ng/mL), alone or in combination, on proliferation of OSCs (2.5 × 104 cells initially seeded per well) over a 40-hour culture period (mean ± SEM, n = 4 independent cultures; no significant differences detected). Fertility and Sterility 2013 100, 1468-1475.e2DOI: (10.1016/j.fertnstert.2013.07.1978) Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

Figure 3 Representative immunoblot depicting the effect of BMP4 (100 ng/mL) and Noggin (150 ng/mL), alone or in combination, on Smad1/5/8 phosphorylation (p-Smad1/5/8) in wells of 5 × 104 OSCs after the indicated durations of treatment. Note that total Smad1 protein and β-actin protein levels remain comparable across treatment groups. Fertility and Sterility 2013 100, 1468-1475.e2DOI: (10.1016/j.fertnstert.2013.07.1978) Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

Figure 4 (A) Conventional RT-PCR analysis of Stra8, Msx1, and Msx2 mRNA levels in OSCs (2.5 × 104 cells per well) treated for 24 hours without or with 100 ng/mL BMP4, alone or in combination with 150 ng/mL Noggin (no RT, PCR analysis of RNA sample without RT used as a negative control to exclude genomic DNA contamination; β-actin, internal sample loading control). (B) Representative examples of immunofluorescence-based detection of Stra8 protein (green, arrows) in cultured OSCs, counterstained with rhodamine phalloidin (red) and DAPI (blue) to visualize cytoplasmic F-actin and nuclear DNA, respectively (scale bars, 10 μm). (C–E) Real-time (quantitative) RT-PCR analysis of changes in Stra8 (C), Msx1 (D), and Msx2 (E) mRNA levels normalized to β-actin mRNA levels in OSCs (2.5 × 104 cells per well) treated for 24 hours without or with 100 ng/mL BMP4, alone or in combination with 150 ng/mL Noggin (mean ± SEM, n = 4 independent cultures; different letters, P<.05). Fertility and Sterility 2013 100, 1468-1475.e2DOI: (10.1016/j.fertnstert.2013.07.1978) Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

Supplemental Figure 1 (A) Morphology of IVD oocytes generated by OSCs cultured without (vehicle, Veh) or with 100 ng/mL BMP4. (B) Comparative gene expression analysis of markers for germ cells (Ddx4) and oocytes (Ybx2, Nobox, Zp1, Zp2, Zp3, Gdf9) in IVD oocytes collected from cultures of OSCs treated with vehicle (Veh) or 100 ng/mL BMP4 (no RT, PCR analysis of RNA sample without RT used as a negative control for genomic DNA contamination; β-actin, internal sample loading control). Fertility and Sterility 2013 100, 1468-1475.e2DOI: (10.1016/j.fertnstert.2013.07.1978) Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions