Germline stem cells: toward the regeneration of spermatogenesis

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Germline stem cells: toward the regeneration of spermatogenesis Hanna Valli, B.S., Bart T. Phillips, Ph.D., Gunapala Shetty, Ph.D., James A. Byrne, Ph.D., Amander T. Clark, Ph.D., Marvin L. Meistrich, Ph.D., Kyle E. Orwig, Ph.D.  Fertility and Sterility  Volume 101, Issue 1, Pages 3-13 (January 2014) DOI: 10.1016/j.fertnstert.2013.10.052 Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions

Figure 1 Standard and experimental options for preserving male fertility. Top, sperm obtained by ejaculation or surgical retrieval from the testes or epididymides are competent to fertilize oocytes using assisted reproductive techniques including IUI, IVF, or IVF ICSI that are standard in most fertility clinics. These options are not available to prepubertal boys who are not producing sperm or to adult azoospermic men. Bottom, testis tissue obtained via biopsy from prepubertal boys contains spermatogonial stem cells (SSCs) that can produce sperm in the context of the intact tissue by xenotransplant, organ culture, or autologous transplantation back into the individual (orange boxes). Sperm retrieved from cultured or transplanted tissue can be used for ICSI. Cells in suspension obtained from biopsied testicular tissue can be transplanted back into the endogenous seminiferous tubules of the patient (blue boxes). SSCs in the suspension can regenerate spermatogenesis and, in some cases, fertility. For infertile individuals who did not preserve germ cells before gonadotoxic therapy, iPSCs may be produced from their somatic cells (e.g., skin or blood) to differentiate into transplantable germ cells (primordial germ cells [PGCs] or SSCs) or haploid germ cells that can be used for ICSI (red boxes). Excerpted with permission from Clark AT, Phillips BT, Orwig KE, Nat Med 2000;1564–5. Fertility and Sterility 2014 101, 3-13DOI: (10.1016/j.fertnstert.2013.10.052) Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions

Figure 2 Human SSCs and spermatogenesis. (A) Testes are composed of seminiferous tubules that start and end at the rete testis. (B) Cut-out of the basement membrane of the seminiferous epithelium. (B and C) The basement membrane of the seminiferous epithelium contains undifferentiated (Adark and Apale) spermatogonia and differentiating type B spermatogonia. Type B spermatogonia give rise to primary spermatocytes that enter meiosis and migrate off the basement membrane. Subsequent meiotic divisions and morphogenesis give rise to secondary spermatocytes, spermatids, and the terminally differentiated spermatozoa that are released into the lumen of the seminiferous tubules. Fertility and Sterility 2014 101, 3-13DOI: (10.1016/j.fertnstert.2013.10.052) Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions

Figure 3 Ultrasound-guided rete testis injections. For SSC transplantation into larger animals, including nonhuman primates, ultrasound is used to visualize the rete testis (echo-dense structure) (A). (B and C) The injection needle is inserted under ultrasound guidance through the scrotal skin into the rete testis space, which is continuous with the seminiferous tubules. (C) Positive pressure is applied so the cells are slowly injected into the rete testis space and seminiferous tubules. Fertility and Sterility 2014 101, 3-13DOI: (10.1016/j.fertnstert.2013.10.052) Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions

Figure 4 Experimental techniques to assay human spermatogonia. (A, B, and C) Expression of spermatogonia markers PLZF (A), SALL4 (B), and PGP9.5 (C) is limited to germ cells located on the basement membrane of human seminiferous tubules. Thus, they are reliable markers to screen test cell populations for human spermatogonia. DAPI (blue) stains all cell nuclei. Scale bar = 50 μm. (D) Human–to–nude mouse xenotransplantation assay. Human testicular tissue is made into a cell suspension and then transplanted into the testis of busulfan-treated infertile nude mice. Two months after the transplantation, the testes are recovered, the tunica is removed, and the seminiferous tubules are gently dispersed to make a whole mount. The tubules are then stained with antiprimate antibody (122) to recognize the colonies of human spermatogonia (green). Fertility and Sterility 2014 101, 3-13DOI: (10.1016/j.fertnstert.2013.10.052) Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions