title: Repeated administrations of carbon nanotubes in male mice cause reversible testis damage without affecting fertility.
abstract: Soluble carbon nanotubes show promise as materials for in vivo delivery and imaging applications. Several reports have described the in vivo toxicity of carbon nanotubes, but their effects on male reproduction have not been examined. Here, we show that repeated intravenous injections of water-soluble multiwalled carbon nanotubes into male mice can cause reversible testis damage without affecting fertility. Nanotubes accumulated in the testes, generated oxidative stress and decreased the thickness of the seminiferous epithelium in the testis at day 15, but the damage was repaired at 60 and 90 days. The quantity, quality and integrity of the sperm and the levels of three major sex hormones were not significantly affected throughout the 90-day period. The fertility of treated male mice was unaffected; the pregnancy rate and delivery success of female mice that mated with the treated male mice did not differ from those that mated with untreated male mice.
authors.affiliation: School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China.
authors.forename: Yuhong
authors.initials: Y
authors.lastname: Bai
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jingping
authors.initials: J
authors.lastname: Zhang
authors.forename: Qingxin
authors.initials: Q
authors.lastname: Mu
authors.forename: Weidong
authors.initials: W
authors.lastname: Zhang
authors.forename: Elizabeth R
authors.initials: ER
authors.lastname: Butch
authors.forename: Scott E
authors.initials: SE
authors.lastname: Snyder
authors.forename: Bing
authors.initials: B
authors.lastname: Yan
mesh_terms: D000818:Animals; D005260:Female; D005298:Fertility; D006728:Hormones / Q000378:metabolism; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D037742:Nanotubes, Carbon / Q000009:adverse effects* / Q000737:chemistry; D018384:Oxidative Stress; D055101:Semen Analysis; D013737:Testis / Q000473:pathology* / Q000648:ultrastructure
chemical_list: D006728:Hormones; D037742:Nanotubes, Carbon