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Spermatocyte depletion leads to Testicular atrophy
Key Event Relationship Overview
AOPs Referencing Relationship
|AOP Name||Adjacency||Weight of Evidence||Quantitative Understanding||Point of Contact||Author Status||OECD Status|
|Histone deacetylase inhibition leading to testicular atrophy||adjacent||High||Not Specified||Shihori Tanabe (send email)||Open for citation & comment||EAGMST Under Review|
Life Stage Applicability
|Adult, reproductively mature||High|
Key Event Relationship Description
Spermatocyte depletion leads to testicular atrophy with a decrease in size. The spermatocyte depletion is involved in testicular atrophy and testicular toxicity [Chapin et al., 1984]. There are different insults that can induce spermatocyte depletion and consequently testicular atrophy.
Evidence Supporting this KER
Spermatocyte depletion caused by apoptosis leads to testicular atrophy. Apoptosis is a basic biological phenomenon in which the cells are controlled through the deletion and turnover in the atrophy of various tissues and organs as well as in tumor regression [Kerr et al., 1972].
Uncertainties and Inconsistencies
Spermatogonial stem cell self-renewal and spermatocyte meiosis are regulated by Sertoli cell signaling, which suggests that various pathways in spermatocytes or spermatogonia are involved in the spermatocyte deletion and testis atrophy/weight loss [Chen et al., 2015].
Known modulating factors
Known Feedforward/Feedback loops influencing this KER
Domain of Applicability
The relationship between spermatocyte depletion and testicular toxicity is likely well conserved between species.
- ME and MAA induced spermatocyte depletion and testicular atrophy in rats (Rattus norvegicus) [Beattie et al., 1984].
- Ethylene glycol monomethyl ether induced depletion of late spermatocytes and testicular atrophy in F344 rat (Rattus norvegicus) [Chapin et al., 1984].
- The epididymal tubules of rats with testicular degeneration had low sperm density (Rattus norvegicus) [Lee et al., 1993].
- Hydroxyurea induced spermatocyte reduction and testicular atrophy (Mus musculus) [Wiger et al., 1995].
Abedi, N. et al. (2017), "Short and long term effects of different doses of paracetamol on sperm parameters and DNA integrity in mice", Middle East Fertility Society Journal 22:323-328
Beattie, P.J. et al. (1984), "The effect of 2-methoxyethanol and methoxyacetic acid on Sertoli cell lactate production and protein synthesis in vitro", Toxicol Appl Pharmacol 76:56-61
Chapin, R.E. et al. (1984), "The effects of ethylene glycol monomethyl ether on testicular histology in F344 rats", J Andro 5:369-380
Chen, S. and Liu, Y. (2015), "Regulation of spermatogonial stem cell self-renewal and spermatocyte meiosis by Sertoli cell signaling", Reproduction 149:R159-R167
de Rooij, D.G. et al. (2001), "Proliferation and differentiation of spermatogonial stem cells", Reproduction 121:347-354
de Rooij, D.G. (1998), "Stem cells in the testis", Int J Exp Path 79:67-80
Kerr, J.F.R. et al. (1972), "Apoptosis: a basic biological phenomenon with wide-ranging implications in tissue kinetics", Br J Cancer 26:239-257
Lee, K.P. et al. (1993), "Testicular degeneration and spermatid retention in young male rats", Toxicol Pathol 21:292-302
Wiger, R. et al. (1995), "Effects of acetaminophen and hydroxyurea on spermatogenesis and sperm chromatin structure in laboratory mice", Reprod Toxicol 9:21-33