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5 August 2015 Reduced Fertility and Altered Epididymal and Sperm Integrity in Mice Lacking ADAM7
Heejin Choi, Cecil Han, Sora Jin, Jun Tae Kwon, Jihye Kim, Juri Jeong, Jaehwan Kim, Sera Ham, Suyeon Jeon, Yung Joon Yoo, Chunghee Cho
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Abstract

The mammalian epididymis is a highly convoluted tubule that connects the testis to the vas deferens. Its proper functions in sperm transport, storage, and maturation are essential for male reproduction. One of the genes predominantly expressed in the epididymis is ADAM7 (a disintegrin and metalloprotease 7). Previous studies have shown that ADAM7 synthesized in the epididymis is secreted into the epididymal lumen and is then transferred to sperm membranes, where it forms a chaperone complex that is potentially involved in sperm fertility. In this study, we generated and analyzed mice with a targeted disruption in the Adam7 gene. We found that the fertility of male mice was modestly but significantly reduced by knockout of Adam7. Histological analyses revealed that the cell heights of the epithelium were dramatically decreased in the caput of the epididymis of Adam7-null mice, suggesting a requirement for ADAM7 in maintaining the integrity of the epididymal epithelium. We found that sperm from Adam7-null mice exhibit decreased motility, tail deformation, and altered tyrosine phosphorylation, indicating that the absence of ADAM7 leads to abnormal sperm functions and morphology. Western blot analyses revealed reduced levels of integral membrane protein 2B (ITM2B) and ADAM2 in sperm from Adam7-null mice, suggesting a requirement for ADAM7 in normal expression of sperm membrane proteins involved in sperm functions. Collectively, our study demonstrates for the first time that ADAM7 is required for normal fertility and is important for the maintenance of epididymal integrity and for sperm morphology, motility, and membrane proteins.

Heejin Choi, Cecil Han, Sora Jin, Jun Tae Kwon, Jihye Kim, Juri Jeong, Jaehwan Kim, Sera Ham, Suyeon Jeon, Yung Joon Yoo, and Chunghee Cho "Reduced Fertility and Altered Epididymal and Sperm Integrity in Mice Lacking ADAM7," Biology of Reproduction 93(3), (5 August 2015). https://doi.org/10.1095/biolreprod.115.130252
Received: 26 March 2015; Accepted: 1 July 2015; Published: 5 August 2015
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