Spermatogonial stem cell (SSC) (SSC)

Spermatogonial stem cells (SSCs) are the unipotent adult stem cells located on the basement membrane of the seminiferous tubules in the testes, serving as the continuous source for sperm production throughout a male's life [1]. These cells are characterized by their ability to either self-renew to maintain the stem cell pool or differentiate into progenitor spermatogonia that eventually undergo meiosis [2]. While SSCs are a cell population rather than a single molecular target, they are of immense therapeutic interest in the field of oncofertility because they are highly vulnerable to the cytotoxic effects of chemotherapy and radiation [3]. Research focuses on the molecular signaling pathways that govern SSC behavior, particularly the GDNF/GFRα1/RET axis, which is essential for their maintenance and proliferation [4]. Clinical applications under investigation include SSC cryopreservation and subsequent autologous transplantation to restore fertility in survivors of childhood cancers [5]. However, challenges remain regarding the safety of these procedures, including the risk of reintroducing malignant cells and ensuring the epigenetic integrity of the germline [6]. Citations: [1] Oatley JM, Brinster RL. (2012). The germline stem cell niche unit. Bioessays. [2] Kanatsu-Shinohara M, Shinohara T. (2013). Spermatogonial stem cell self-renewal and development. Annu Rev Cell Dev Biol. [3] Meistrich ML. (2013). The effects of chemotherapy and radiotherapy on spermatogenesis in humans. Hum Reprod Update. [4] Hofmann MC. (2008). Gdnf signaling and the proliferation of spermatogonial stem cells. Front Biosci. [5] Fayomi AP, Orwig KE. (2018). Spermatogonial stem cells and fertility preservation. Fertil Steril. [6] Mulder CL, et al. (2016). Restoring fertility in sterile childhood cancer survivors using molecularly characterized spermatogonial stem cells. Hum Reprod Update.

Other names

Male germline stem cellA-single spermatogoniaGermline stem cellSpermatogonia

Spermatogonial stem cells are not molecular targets in the classical sense; however, they are pharmacologically relevant as they are depleted by alkylating agents like Busulfan through DNA cross-linking and subsequent apoptosis [3]. Conversely, their self-renewal and proliferation can be modulated by growth factors such as Glial cell line-derived neurotrophic factor (GDNF), which signals through the GFRα1/RET receptor complex [4].