L. L. Sun, Z. Y. Sun, P. Zhang, X. W. Zhai, J. Tang, Q. J. Pan, Q. H

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Effect of insulin on oogenesis from mouse fetal germ cells in a serum-free 3D culture system  L.L. Sun, Z.Y. Sun, P. Zhang, X.W. Zhai, J. Tang, Q.J. Pan, Q.H. Shi, W. Shen  Reproductive BioMedicine Online  Volume 20, Issue 1, Pages 11-25 (January 2010) DOI: 10.1016/j.rbmo.2009.11.001 Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 1 Evaluation of germ cells entering into progression through meiotic prophase I. Rows A and B show the leptotene and zygotene stages of meiotic prophase, respectively in 14.5days post-coitum female germ cells identified by a diffuse immunofluorescence staining using anti-synaptonemal complex protein (SCP3) antibody. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 2 In-vitro development of mouse oocytes derived from 12.5days post-coitum (dpc) fetal ovaries was affected by insulin (experimental group II). The figure shows the developed ovarian oocytes derived from 12.5dpc mouse ovaries cultured in vitro for 10, 12 and 14days, respectively. Panels in row A show the developed ovaries in the control group for three culture stages. Panels in rows B–D show the developed ovaries in the experimental group cultured with 5, 10 and 20μg/ml insulin, respectively. Arrows shown the oocytes. Bars=100μm. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 3 In-vitro development of mouse oocytes derived from 12.5days post-coitum (dpc) fetal ovaries was affected by FSH (experimental group III). The figure shows the developed ovarian oocytes derived from 12.5dpc mouse ovaries cultured in vitro for 10, 12 and 14days, respectively. Rows A–C showed the developed ovaries in the experimental group supplied with 10, 20 and 50mIU/ml FSH, respectively. Bars=100μm. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 4 In-vitro development of mouse oocytes derived from 12.5days post-coitum (dpc) fetal ovaries was affected by low doses of insulin (group I). The figure shows the developed ovarian oocytes derived from 12.5dpc mouse ovaries cultured in vitro for 10, 12 and 14days, respectively. Rows A–C showed the developed ovaries in the experimental group supplied with 0.2, 0.5 and 1μg/ml insulin, respectively. Bars=100μm. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 5 In-vitro development of mouse oocytes derived from 12.5days post-coitum (dpc) fetal ovaries was affected by insulin and FSH (experimental groups IV, V and VI). The figure shows the developed ovarian oocytes derived from 12.5dpc mouse ovaries cultured in vitro for 10, 12 and 14days, respectively. Rows A and B showed the developed ovaries in the experimental group supplied with 0.5 and 1% insulin–transferrin–selenium (ITS) mixes, respectively (group IV). Row C shows the developed ovaries in the experimental group supplied with 20mIU/ml FSH and 5μg/ml insulin (group V). Row D shows the developed ovaries in the experimental group supplied with 20mIU/ml FSH and 1% ITS (group VI). Bars=100μm. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 6 The histological appearance of cultured mouse ovarian tissue derived from 12.5days post-coitum fetuses was affected by insulin. Panels B–D show the histological appearance, after haematoxylin/eosin staining, of sections of the developed ovaries in the experimental group supplied with 5, 10 and 20μg/ml insulin, respectively. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 7 In-vitro development of mouse follicles derived from 12.5days post-coitum (dpc) fetal ovaries was affected by insulin and FSH. Panels A–D show the histological appearance of sections of mouse ovaries cultured for 10, 12, 14 and 14days under control conditions, respectively. The arrows in panels A–D indicate the primordial, primary, early secondary, and secondary follicles, respectively. Bars=50μm. Panel E shows the number of follicles in the 12.5dpc fetal ovaries cultured in vitro for 10days in different experimental groups and the control group. * indicates a significant difference (P<0.05) and ** indicates a significant difference (P<0.01) from the control group. ITS=insulin–transferrin–selenium. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 8 Percentage of follicles in primary, early secondary and secondary classes in mouse ovaries developed in vitro for 10, 12 and 14days. Fetal mouse ovaries were cultured in the medium containing low doses of insulin A–C (group I) and high doses of insulin D–F (group II), different doses of FSH G–I (group III), FSH plus insulin J (group V), FSH plus insulin–transferrin–selenium (ITS) K (group VI), and in the control medium L, respectively. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 9 Diameter of oocytes from fetal mouse gonad cells cultured in vitro for 10, 12, 14days. Panels A and B show the experimental groups with low doses and high doses of insulin (groups I and II). Panel C shows the experimental groups with 10, 20, 50mIU/ml FSH (group III). Panel D shows the experimental group treated with 0.5%, 1% and 2% insulin–transferrin–selenium (ITS; group IV). Panel E shows the experimental groups with 20mIU/ml FSH and 1% ITS or 5μg/ml insulin (groups V and VI). Data are the mean±SEM of three independent experiments in which the diameter of oocytes was measured by Image Pro-Plus discovery. Oocyte diameter for both the experimental and control groups increased throughout the culture period. * Indicates a significant difference (P<0.05) and ** indicates a significant difference (P<0.01) from the control group. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 10 Detection of gene expression of mouse ovaries derived from 12.5days post-coitum (dpc) fetal gonads cultured in vitro. Panels A–D show quantification of Cx43, Cx37, Bax and Bcl-x mRNAs in 12.5dpc fetal mouse ovaries cultured with different treatments of 20mIU/ml FSH or 5μg/ml insulin (Ins) in vitro for 14days, respectively, and 3-day-old mouse ovaries developed in vitro as control. * Indicates a significant difference (P<0.05) and ** indicates a significant difference (P<0.01) from the control group. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 11 Detection of maturation of mouse oocytes derived from 12.5days post-coitum (dpc) fetal gonads in vitro. Panel A shows the quantification of Scp3 mRNA in 12.5dpc fetal mouse ovaries cultured with different treatments of 20mIU/ml FSH or 5μg/ml insulin (ins) in vitro for 14days, respectively, and 3-day-old mouse ovaries developed in vitro as control. Panel B shows the ratio of different meiotic stage germ cells in fetal mouse ovaries cultured with different treatments of insulin or FSH in vitro for 5days, respectively. Panel C shows the intracellular concentrations of reduced glutathione (GSH) in the oocytes of 12.5dpc fetal mouse ovaries cultured in vitro for 14days, with oocytes at the germinal vesicle stage as controls. ** Indicates a significant difference (P<0.01) from the control group. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions

Figure 12 Detection of FSH receptor (FSHR) expression in mouse ovaries developed in vitro. Panel A shows the quantification of FSHR mRNAs in 12.5days post-coitum fetal mouse ovaries cultured with different treatments of 20mIU/ml FSH or 5μg/ml insulin (ins) in vitro for 14days, respectively, and 3-day-old mouse ovaries developed in vitro as control. Panel B shows the expression level of FSHR protein detected by Western blotting. * indicates a significant difference (P<0.05) and ** indicates a significant difference (P<0.01) from the control group. Reproductive BioMedicine Online 2010 20, 11-25DOI: (10.1016/j.rbmo.2009.11.001) Copyright © 2009 Reproductive Healthcare Ltd. Terms and Conditions