Abstract
Lactoferrin (LF) is present in the oviduct, reduces in vitro gamete interaction, and affects sperm capacitation parameters in humans. Our aim was to investigate LF actions on further stages of the reproductive process in the Wistar rat model. Motile sperm were obtained from cauda epididymis to assess LF binding by direct immunofluorescence and LF effect on acrosome reaction (AR) using a Coomassie blue staining. After ovarian hyperstimulation of female rats, oocytes were surgically recovered and coincubated with motile sperm and different doses of LF to estimate the in vitro fertilization (IVF) rate. To evaluate the LF effect on pregnancy and embryo implantation, female rats (80 days old) were placed with males and received daily intraperitoneal injections of LF during one complete estrous cycle (pregnancy experiments) or during the first 8 gestational days (implantation experiments). The number of pregnant females and live born pups was recorded after labor. Moreover, the number of implantation sites was registered during the implantation period. LF was able to bind to the sperm head, midpiece, and tail. 10 and 100 μg/ml LF stimulated the AR but reduced the IVF rate. The administration of 100 and 200 mg/kg LF significantly decreased the number of implantation sites and the litter size, whereas 100 mg/kg LF declined the pregnancy rate. The results suggest that LF might interfere with the reproductive process, possibly interfering with gamete interaction or inducing a premature AR; nevertheless, the mechanisms involved are yet to be elucidated.
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20 June 2023
A Correction to this paper has been published: https://doi.org/10.1007/s10534-023-00515-8
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This study was partially supported by a grant from SECyT UNR (PID‐BIO581).
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This study was partially supported by a grant from SECyT UNR (PID‐BIO581).
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EM, AG, MM, and MJM performed the experiments and analyzed the results. EM, FP and SG contributed to the experimental design, methodology, and analysis of the results. EM, AG, MM, and SG wrote the main manuscript and prepared the figures. FP and SG supervised the study and contributed to funding acquisition.
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Massa, E., Gola, A., Moriconi, M. et al. Lactoferrin affects in vitro and in vivo fertilization and implantation in rats. Biometals 36, 575–585 (2023). https://doi.org/10.1007/s10534-022-00460-y
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DOI: https://doi.org/10.1007/s10534-022-00460-y