Primordial follicle oocytes are extremely vulnerable to DNA damage caused by exogenous agents, such as those commonly used to treat cancer. Consequently, female cancer patients often have diminished ovarian reserve, which if severe enough, can cause premature ovarian failure and early menopause. Advances in cancer therapies have resulted in significantly improved cancer survival rates; therefore, it is becoming increasingly important to devise strategies to protect the ovarian reserve from cancer treatments, to avoid loss of fertility and endocrine dysfunction. In this study, we aimed to determine whether supplementation with nicotinamide mononucleotide (NMN) could preserve the ovarian reserve following exposure to DNA-damaging cancer treatments. Adult female mice (n = 5–6/group) received saline or NMN (500 mg/kg/day) for 8 days. Mice were left untreated or exposed to γ-irradiation (0.1 Gy) or cyclophosphamide (150 mg/kg) on day 7 and ovaries and serum collected for analysis on day 12. We report that γ-irradiation treatment significantly reduced the number of primordial follicles, but supplementation with NMN did not prevent the observed follicle loss. Similarly, cyclophosphamide treatment significantly reduced primordial follicle numbers, but these losses were not prevented by NMN supplementation. In conclusion, depletion of the ovarian reserve following γ-irradiation or cyclophosphamide was not protected by NMN supplementation under the conditions employed in this study.
Supplemental Figure 1. Adult (8 week old) female C57Bl6 mice were supplemented for 8 days with saline or NMN (500mg/kg/day) via intraperitoneal injection. On day 7 mice were untreated (γ-irradiation controls) or treated with ɣ-irradiation (0.1Gy whole body), or received an intraperitoneal injection of saline (vehicle control) or cyclophosphamide (150mg/kg) (n=5/6 mice/group, 48 animals total). Ovaries and serum were collected onday 12 (i.e. 5 days after exposure to ɣ-irradiation or cyclophosphamide).