Abstract
Purpose
Previous studies have suggested the involvement of serum insulin-like growth factors (IGFs) and IGF binding proteins (IGFBPs) in the regulation of the female reproductive system. Little is known of these peptides in the seminal plasma (SP) of men and their potential effects on fertility. We assessed SP levels of these peptides in infertile men with low sperm motility (asthenozoospermic; AZ) and low sperm counts (oligozoospermic; OZ), its effects on in vivo sperm motility, and whether there is a correlation with aging.
Methods
Twenty-eight infertile men (AZ; n = 18 and OZ; n = 10) and 20 fertile normozoospermic (NZ) men were studied. Seminal plasma IGF-I, IGF-II, IGFBP-2, IGFBP-3, and prostate-specific antigen (PSA) levels were measured, and spermatozoa mRNA transcript patterns were examined.
Results
Asthenozoospermic men had higher SP IGF-I, IGF-II, IGFBP-2, and PSA levels than NZ and OZ men, whereas SP IGFBP-3 levels were similar between the three groups. Sperm count positively correlated with SP IGF-I, IGF-II, and IGFBP-2; sperm motility negatively correlated with SP IGF-II and IGFBP-2; and age correlated positively with SP IGF-II. The expression of IGF-I and IGF-II mRNA and mRNA receptors was detectable, but no variations in transcript levels were noted.
Conclusion
Decreased sperm motility, but not sperm count, in infertile AZ men is associated with increased SP IGF-I, IGF-II, IGFBP-2, and PSA levels. Changes in SP IGFs and their interactions with IGFBPs and IGF receptors, and PSA levels suggest a role of these SP peptides in modulating sperm motility and possibly prostate disease development in aging men.
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The authors express their acknowledgment of the patients, control subjects, nurses, study coordinators, and sub-investigators involved in the study.
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L.F., A.N.T., and K.O.L. are supported in part by a grant from the Endocrine and Metabolic Society of Singapore. A.R.H. is supported in part by the VA Biomedical Merit Review (BX002905).
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K.C.J.Y. and A.T.B. declare that they have no conflict of interest.
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These authors contributed equally: Li Fu, Kevin C. J. Yuen
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Fu, L., Yuen, K.C.J., Tint, A.N. et al. Association of decreased sperm motility and increased seminal plasma IGF-I, IGF-II, IGFBP-2, and PSA levels in infertile men. Endocrine 74, 698–706 (2021). https://doi.org/10.1007/s12020-021-02823-w
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DOI: https://doi.org/10.1007/s12020-021-02823-w